/* roulang page: index */
:root {
            --color-bg-dark: #0B0F14;
            --color-bg-paper: #F4F6F8;
            --color-accent: #00D9A5;
            --color-warning: #FF5C35;
            --color-card-dark: #1B232E;
            --color-border-dark: #2A3442;
            --color-positive: #2EE6A8;
            --color-negative: #FF4D4D;
            --color-text-dark: #0B0F14;
            --color-text-mid: #5A6572;
            --color-text-light: #9BA6B2;
            --color-text-on-dark: #E8EDF2;
            --color-text-dim-on-dark: #8B97A4;
            --font-sans: "Inter", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
            --radius: 4px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 8px -2px rgba(0, 0, 0, 0.12);
            --shadow-card-hover: 0 18px 40px -24px rgba(0, 0, 0, 0.65);
            --shadow-dark-card: 0 4px 14px -4px rgba(0, 0, 0, 0.45);
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --section-pad-desktop: 96px;
            --section-pad-mobile: 56px;
            --gap-section: 56px;
            --header-height: 68px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text-dark);
            background-color: var(--color-bg-paper);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-sans);
            font-weight: 800;
            letter-spacing: -0.01em;
            margin: 0 0 0.5em;
            line-height: 1.25;
            color: var(--color-text-dark);
        }

        h1 {
            font-size: clamp(40px, 6vw, 64px);
            font-weight: 900;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(28px, 4vw, 44px);
            letter-spacing: -0.015em;
        }
        h3 {
            font-size: clamp(20px, 2.8vw, 28px);
            font-weight: 700;
        }
        h4 {
            font-size: 17px;
            font-weight: 700;
        }
        p {
            margin: 0 0 1em;
            color: var(--color-text-mid);
        }
        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
        }
        a:hover,
        a:focus {
            color: #00c291;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 2px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            padding: 0;
        }

        ::selection {
            background: var(--color-accent);
            color: #0B0F14;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        @media (max-width: 640px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        .section {
            padding: var(--section-pad-desktop) 0;
        }
        @media (max-width: 640px) {
            .section {
                padding: var(--section-pad-mobile) 0;
            }
        }

        .section--dark {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
        }
        .section--dark h1,
        .section--dark h2,
        .section--dark h3,
        .section--dark h4 {
            color: var(--color-text-on-dark);
        }
        .section--dark p {
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .text-mid {
            color: var(--color-text-dim-on-dark);
        }

        .section--paper {
            background: var(--color-bg-paper);
        }

        .section--carbon {
            background: #121820;
            color: var(--color-text-on-dark);
        }
        .section--carbon h2,
        .section--carbon h3,
        .section--carbon h4 {
            color: var(--color-text-on-dark);
        }
        .section--carbon p {
            color: var(--color-text-dim-on-dark);
        }

        .section--accent-tint {
            background: #EAFCF7;
        }

        .section--grid-pattern {
            background-image:
                linear-gradient(rgba(15, 32, 28, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(15, 32, 28, 0.04) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        .section__header {
            margin-bottom: 40px;
            max-width: 720px;
        }
        .section__header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section__eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 12px;
        }
        .section__eyebrow--dark {
            color: var(--color-accent);
        }
        .section__title {
            font-size: clamp(26px, 3.8vw, 42px);
            font-weight: 800;
            letter-spacing: -0.015em;
            line-height: 1.2;
            margin-bottom: 16px;
        }
        .section__desc {
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text-mid);
            max-width: 620px;
        }
        .section__desc--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section--dark .section__desc,
        .section--dark .section__desc p {
            color: var(--color-text-dim-on-dark);
        }

        .grid {
            display: grid;
            gap: 24px;
        }
        .grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }
        .grid-5 {
            grid-template-columns: repeat(5, 1fr);
        }
        .grid--gap-lg {
            gap: 32px;
        }
        .grid--gap-sm {
            gap: 16px;
        }

        @media (max-width: 1024px) {
            .grid-4, .grid-5 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .grid-2, .grid-3, .grid-4, .grid-5 {
                grid-template-columns: 1fr;
            }
        }

        .text-accent {
            color: var(--color-accent);
        }
        .text-warning {
            color: var(--color-warning);
        }
        .text-positive {
            color: var(--color-positive);
        }
        .text-negative {
            color: var(--color-negative);
        }
        .text-mid {
            color: var(--color-text-mid);
        }
        .text-light {
            color: var(--color-text-light);
        }
        .text-on-dark {
            color: var(--color-text-on-dark);
        }
        .text-dim-on-dark {
            color: var(--color-text-dim-on-dark);
        }
        .fw-900 {
            font-weight: 900;
        }
        .fw-800 {
            font-weight: 800;
        }
        .fw-700 {
            font-weight: 700;
        }
        .fs-small {
            font-size: 13px;
        }
        .fs-base {
            font-size: 15px;
        }
        .fs-large {
            font-size: 17px;
        }
        .mt-0 { margin-top: 0; }
        .mb-0 { margin-bottom: 0; }
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }
        .mb-4 { margin-bottom: 32px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mt-4 { margin-top: 32px; }

        /* Header */
        .site-header {
            background: var(--color-bg-dark);
            position: sticky;
            top: 0;
            z-index: 100;
            height: var(--header-height);
            border-bottom: 1px solid var(--color-border-dark);
            transition: background var(--transition-med), box-shadow var(--transition-med);
        }
        .site-header.scrolled {
            box-shadow: 0 8px 28px -12px rgba(0, 0, 0, 0.6);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 16px;
        }
        .site-header__left {
            display: flex;
            align-items: center;
            gap: 28px;
            flex: 1;
            min-width: 0;
        }
        .site-header__right {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-shrink: 0;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 20px;
            font-weight: 900;
            letter-spacing: -0.01em;
            color: var(--color-text-on-dark);
            white-space: nowrap;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .site-logo:hover,
        .site-logo:focus {
            color: var(--color-accent);
        }
        .site-logo__icon {
            width: 32px;
            height: 32px;
            background: var(--color-accent);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #0B0F14;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 2px;
            list-style: none;
            margin: 0;
            padding: 0;
            overflow-x: auto;
            scrollbar-width: none;
            -webkit-overflow-scrolling: touch;
        }
        .main-nav::-webkit-scrollbar {
            display: none;
        }
        .main-nav__item {
            position: relative;
            flex-shrink: 0;
        }
        .main-nav__link {
            display: block;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.02em;
            color: var(--color-text-dim-on-dark);
            text-decoration: none;
            position: relative;
            transition: color var(--transition-fast);
            white-space: nowrap;
            border-radius: var(--radius);
        }
        .main-nav__link::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--color-accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform var(--transition-med);
            border-radius: 2px;
        }
        .main-nav__link:hover {
            color: var(--color-text-on-dark);
        }
        .main-nav__link:hover::after {
            transform: scaleX(1);
        }
        .main-nav__link--active {
            color: var(--color-accent);
        }
        .main-nav__link--active::after {
            transform: scaleX(1);
        }
        .main-nav__link:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

        .search-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius);
            border: 1px solid var(--color-border-dark);
            background: transparent;
            color: var(--color-text-dim-on-dark);
            font-size: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-med);
        }
        .search-btn:hover {
            color: var(--color-accent);
            border-color: var(--color-accent);
            transform: rotate(8deg);
        }
        .search-btn:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 0.02em;
            border-radius: var(--radius);
            text-decoration: none;
            transition: all var(--transition-med);
            position: relative;
            overflow: hidden;
            white-space: nowrap;
            cursor: pointer;
            border: 1px solid transparent;
            line-height: 1.5;
        }
        .btn--primary {
            background: var(--color-accent);
            color: #0B0F14;
            border-color: var(--color-accent);
        }
        .btn--primary::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.18);
            transition: left var(--transition-med);
            border-radius: var(--radius);
        }
        .btn--primary:hover {
            background: #00c291;
            border-color: #00c291;
            color: #0B0F14;
            transform: translateY(-1px);
        }
        .btn--primary:hover::before {
            left: 0;
        }
        .btn--primary .btn__arrow {
            transition: transform var(--transition-med);
        }
        .btn--primary:hover .btn__arrow {
            transform: translateX(4px);
        }
        .btn--outline-dark {
            background: transparent;
            color: var(--color-text-on-dark);
            border-color: var(--color-border-dark);
        }
        .btn--outline-dark:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.06);
            transform: translateY(-1px);
        }
        .btn--outline-light {
            background: transparent;
            color: var(--color-text-dark);
            border-color: #CBD5E0;
        }
        .btn--outline-light:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.05);
            transform: translateY(-1px);
        }
        .btn--warning {
            background: var(--color-warning);
            color: #fff;
            border-color: var(--color-warning);
        }
        .btn--warning:hover {
            background: #e64a2b;
            border-color: #e64a2b;
            color: #fff;
            transform: translateY(-1px);
        }
        .btn--sm {
            padding: 7px 14px;
            font-size: 13px;
            border-radius: var(--radius);
        }
        .btn--lg {
            padding: 14px 28px;
            font-size: 16px;
            border-radius: var(--radius);
        }
        .btn--pill {
            border-radius: var(--radius-pill);
        }
        .btn--full {
            width: 100%;
        }
        .btn .btn__arrow {
            font-size: 14px;
            line-height: 1;
            margin-left: 2px;
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .hamburger {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: var(--radius);
            border: 1px solid var(--color-border-dark);
            background: transparent;
            color: var(--color-text-on-dark);
            font-size: 20px;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: border-color var(--transition-fast), color var(--transition-fast);
            flex-shrink: 0;
        }
        .hamburger:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
        }

        .mobile-drawer {
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--color-bg-dark);
            z-index: 99;
            padding: 24px 20px;
            display: none;
            flex-direction: column;
            gap: 6px;
            overflow-y: auto;
            border-top: 1px solid var(--color-border-dark);
            box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.7);
        }
        .mobile-drawer.is-open {
            display: flex;
        }
        .mobile-drawer__link {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 16px;
            font-size: 17px;
            font-weight: 700;
            color: var(--color-text-on-dark);
            border-radius: var(--radius);
            text-decoration: none;
            transition: background var(--transition-fast), color var(--transition-fast);
            border: 1px solid transparent;
        }
        .mobile-drawer__link:hover {
            background: rgba(0, 217, 165, 0.06);
            color: var(--color-accent);
            border-color: var(--color-border-dark);
        }
        .mobile-drawer__link--active {
            color: var(--color-accent);
            border-color: var(--color-border-dark);
            background: rgba(0, 217, 165, 0.04);
        }
        .mobile-drawer__cta {
            margin-top: 16px;
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        @media (max-width: 1024px) {
            .main-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .search-btn {
                display: none;
            }
            .header-cta .btn {
                display: none;
            }
        }

        /* Hero */
        .hero {
            background: var(--color-bg-dark);
            padding: 0;
            position: relative;
            overflow: hidden;
            min-height: calc(100vh - var(--header-height));
            display: flex;
            align-items: stretch;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 45%;
            height: 100%;
            background: rgba(0, 217, 165, 0.03);
            pointer-events: none;
            z-index: 1;
        }
        .hero__container {
            display: flex;
            width: 100%;
            max-width: 1440px;
            margin: 0 auto;
            min-height: 100%;
            position: relative;
            z-index: 2;
        }
        .hero__content {
            flex: 0 0 55%;
            padding: 80px 48px 80px 64px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
        }
        .hero__visual {
            flex: 0 0 45%;
            position: relative;
            min-height: 520px;
            background: var(--color-card-dark);
            overflow: hidden;
        }
        .hero__visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            aspect-ratio: 4 / 3;
        }
        .hero__visual::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(11, 15, 20, 0.35) 0%, transparent 50%, rgba(11, 15, 20, 0.5) 100%);
            pointer-events: none;
        }
        .hero__eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 20px;
        }
        .hero__eyebrow::before {
            content: '';
            width: 20px;
            height: 2px;
            background: var(--color-accent);
            border-radius: 2px;
        }
        .hero__title {
            font-size: clamp(38px, 5.5vw, 62px);
            font-weight: 900;
            letter-spacing: -0.02em;
            color: var(--color-text-on-dark);
            line-height: 1.15;
            margin-bottom: 20px;
        }
        .hero__title .highlight {
            color: var(--color-accent);
        }
        .hero__subtitle {
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text-dim-on-dark);
            max-width: 520px;
            margin-bottom: 28px;
        }
        .hero__group-indicator {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
            padding: 12px 18px;
            background: rgba(0, 217, 165, 0.05);
            border: 1px solid rgba(0, 217, 165, 0.2);
            border-radius: var(--radius);
            max-width: 520px;
        }
        .hero__group-indicator .count {
            font-size: 28px;
            font-weight: 900;
            color: var(--color-accent);
            font-family: var(--font-mono);
            letter-spacing: -0.02em;
        }
        .hero__group-indicator .label {
            font-size: 13px;
            color: var(--color-text-dim-on-dark);
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .hero__actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }
        .hero__stats {
            display: flex;
            gap: 28px;
            flex-wrap: wrap;
        }
        .hero__stat-item {
            display: flex;
            flex-direction: column;
        }
        .hero__stat-item .value {
            font-size: 24px;
            font-weight: 900;
            color: var(--color-text-on-dark);
            font-family: var(--font-mono);
            letter-spacing: -0.02em;
        }
        .hero__stat-item .label {
            font-size: 12px;
            color: var(--color-text-dim-on-dark);
            letter-spacing: 0.03em;
            text-transform: uppercase;
        }

        @media (max-width: 1024px) {
            .hero__container {
                flex-direction: column;
            }
            .hero__content {
                flex: 1;
                padding: 48px 24px;
            }
            .hero__visual {
                flex: 1;
                min-height: 340px;
                width: 100%;
            }
            .hero::before {
                display: none;
            }
        }
        @media (max-width: 640px) {
            .hero__content {
                padding: 32px 16px;
            }
            .hero__title {
                font-size: 32px;
            }
            .hero__subtitle {
                font-size: 14px;
            }
            .hero__groups-indicator {
                flex-direction: column;
                align-items: flex-start;
            }
            .hero__actions {
                flex-direction: column;
            }
            .hero__actions .btn {
                width: 100%;
            }
            .hero__stats {
                gap: 16px;
            }
        }

        /* Cards */
        .card {
            background: #fff;
            border: 1px solid #E2E8F0;
            border-radius: var(--radius);
            padding: 24px;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-fast);
            position: relative;
            overflow: hidden;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--color-accent);
        }
        .card--dark {
            background: var(--color-card-dark);
            border-color: var(--color-border-dark);
            color: var(--color-text-on-dark);
        }
        .card--dark:hover {
            border-color: rgba(0, 217, 165, 0.5);
            box-shadow: var(--shadow-dark-card);
        }
        .card--dark h3,
        .card--dark h4 {
            color: var(--color-text-on-dark);
        }
        .card--dark p {
            color: var(--color-text-dim-on-dark);
        }
        .card--flat {
            box-shadow: var(--shadow-card);
        }
        .card--flat:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .card__image {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            border-radius: var(--radius);
            margin-bottom: 16px;
            transition: transform var(--transition-med);
        }
        .card:hover .card__image {
            transform: scale(1.03);
        }
        .card__tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.08);
            padding: 3px 8px;
            border-radius: var(--radius-pill);
            margin-bottom: 10px;
        }
        .card__tag--dark {
            background: rgba(0, 217, 165, 0.12);
            color: var(--color-accent);
        }
        .card__date {
            font-size: 12px;
            color: var(--color-text-light);
            letter-spacing: 0.02em;
            margin-bottom: 8px;
            display: block;
        }
        .card__title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card__title a {
            color: inherit;
            text-decoration: none;
        }
        .card__title a:hover {
            color: var(--color-accent);
        }
        .card__text {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-mid);
            margin-bottom: 14px;
        }
        .card--dark .card__text {
            color: var(--color-text-dim-on-dark);
        }
        .card__link {
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            position: relative;
            padding-bottom: 2px;
            transition: color var(--transition-fast);
        }
        .card__link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 1px;
            background: var(--color-accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform var(--transition-med);
        }
        .card__link:hover {
            color: #00c291;
        }
        .card__link:hover::after {
            transform: scaleX(1);
        }
        .card__link .arrow {
            transition: transform var(--transition-med);
        }
        .card__link:hover .arrow {
            transform: translateX(3px);
        }

        .card--horizontal {
            display: flex;
            gap: 20px;
            align-items: center;
            padding: 20px;
        }
        .card--horizontal .card__image-wrap {
            flex: 0 0 180px;
            border-radius: var(--radius);
            overflow: hidden;
            aspect-ratio: 16 / 10;
        }
        .card--horizontal .card__image-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }
        .card--horizontal:hover .card__image-wrap img {
            transform: scale(1.04);
        }
        .card--horizontal .card__body {
            flex: 1;
            min-width: 0;
        }

        @media (max-width: 640px) {
            .card--horizontal {
                flex-direction: column;
                align-items: flex-start;
            }
            .card--horizontal .card__image-wrap {
                flex: 0 0 auto;
                width: 100%;
                aspect-ratio: 16 / 9;
            }
            .card {
                padding: 18px;
            }
        }

        /* Badge */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            padding: 4px 10px;
            border-radius: var(--radius-pill);
            line-height: 1.4;
            white-space: nowrap;
        }
        .badge--accent {
            background: rgba(0, 217, 165, 0.12);
            color: var(--color-accent);
            border: 1px solid rgba(0, 217, 165, 0.25);
        }
        .badge--warning {
            background: rgba(255, 92, 53, 0.12);
            color: var(--color-warning);
            border: 1px solid rgba(255, 92, 53, 0.25);
        }
        .badge--neutral {
            background: rgba(155, 166, 178, 0.15);
            color: #6B7684;
            border: 1px solid rgba(155, 166, 178, 0.3);
        }
        .badge--dark {
            background: rgba(0, 217, 165, 0.15);
            color: var(--color-accent);
            border: 1px solid rgba(0, 217, 165, 0.3);
        }
        .badge--top {
            background: var(--color-warning);
            color: #fff;
            border-color: var(--color-warning);
        }

        /* List */
        .list--numbered {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .list--numbered li {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 14px 16px;
            background: #fff;
            border: 1px solid #E2E8F0;
            border-radius: var(--radius);
            transition: border-color var(--transition-fast), transform var(--transition-fast);
        }
        .list--numbered li:hover {
            border-color: var(--color-accent);
            transform: translateX(4px);
        }
        .list--numbered .num {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            background: var(--color-accent);
            color: #0B0F14;
            font-weight: 900;
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius);
            font-family: var(--font-mono);
        }
        .list--numbered .content {
            flex: 1;
        }
        .list--numbered .title {
            font-weight: 700;
            font-size: 15px;
            color: var(--color-text-dark);
            margin-bottom: 2px;
        }
        .list--numbered .desc {
            font-size: 13px;
            color: var(--color-text-mid);
            margin: 0;
        }

        /* Progress bars / metrics */
        .metric-bar {
            margin-bottom: 18px;
        }
        .metric-bar__header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 6px;
        }
        .metric-bar__label {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-mid);
        }
        .metric-bar__value {
            font-size: 15px;
            font-weight: 900;
            font-family: var(--font-mono);
            color: var(--color-text-dark);
        }
        .section--dark .metric-bar__label {
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .metric-bar__value {
            color: var(--color-text-on-dark);
        }
        .metric-bar__track {
            width: 100%;
            height: 8px;
            background: #E2E8F0;
            border-radius: var(--radius-pill);
            overflow: hidden;
        }
        .section--dark .metric-bar__track {
            background: var(--color-border-dark);
        }
        .metric-bar__fill {
            height: 100%;
            background: var(--color-accent);
            border-radius: var(--radius-pill);
            transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .metric-bar__fill--warning {
            background: var(--color-warning);
        }
        .metric-bar__fill--positive {
            background: var(--color-positive);
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid #E2E8F0;
            border-radius: var(--radius);
            background: #fff;
            overflow: hidden;
            transition: border-color var(--transition-fast), box-shadow var(--transition-med);
        }
        .faq-item:hover {
            border-color: var(--color-accent);
        }
        .faq-item.is-open {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-card);
        }
        .faq-item__btn {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 700;
            color: var(--color-text-dark);
            text-align: left;
            cursor: pointer;
            background: transparent;
            transition: color var(--transition-fast);
            border: none;
        }
        .faq-item__btn:hover {
            color: var(--color-accent);
        }
        .faq-item__icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: var(--radius);
            border: 1px solid #E2E8F0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: var(--color-text-mid);
            transition: transform var(--transition-med), border-color var(--transition-fast), color var(--transition-fast);
        }
        .faq-item.is-open .faq-item__icon {
            transform: rotate(45deg);
            border-color: var(--color-accent);
            color: var(--color-accent);
        }
        .faq-item__panel {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.25s ease;
            padding: 0 20px;
        }
        .faq-item.is-open .faq-item__panel {
            max-height: 300px;
            padding: 0 20px 16px;
        }
        .faq-item__answer {
            font-size: 14px;
            line-height: 1.75;
            color: var(--color-text-mid);
            margin: 0;
            padding-top: 4px;
            border-top: 1px solid #F0F3F5;
        }

        /* Form */
        .form-input {
            width: 100%;
            padding: 12px 16px;
            font-size: 14px;
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            outline: none;
            font-family: inherit;
        }
        .form-input::placeholder {
            color: var(--color-text-dim-on-dark);
        }
        .form-input:focus {
            border-color: var(--color-accent);
            box-shadow: 0 0 0 3px rgba(0, 217, 165, 0.12);
        }
        .form-input--light {
            background: #fff;
            border-color: #D1D9E0;
            color: var(--color-text-dark);
        }
        .form-input--light::placeholder {
            color: var(--color-text-light);
        }
        .form-input--light:focus {
            border-color: var(--color-accent);
            box-shadow: 0 0 0 3px rgba(0, 217, 165, 0.15);
        }

        .form-group {
            margin-bottom: 16px;
        }
        .form-label {
            display: block;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--color-text-mid);
        }
        .section--dark .form-label {
            color: var(--color-text-dim-on-dark);
        }

        /* Chips */
        .chip-row {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .chip {
            display: inline-flex;
            align-items: center;
            padding: 7px 16px;
            font-size: 13px;
            font-weight: 600;
            border-radius: var(--radius-pill);
            border: 1px solid #D1D9E0;
            background: #fff;
            color: var(--color-text-mid);
            cursor: pointer;
            transition: all var(--transition-fast);
            user-select: none;
            white-space: nowrap;
        }
        .chip:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.04);
        }
        .chip--active {
            background: var(--color-accent);
            color: #0B0F14;
            border-color: var(--color-accent);
            font-weight: 700;
        }
        .chip--active:hover {
            background: #00c291;
            color: #0B0F14;
        }
        .section--dark .chip {
            background: transparent;
            border-color: var(--color-border-dark);
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .chip:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
        }
        .section--dark .chip--active {
            background: var(--color-accent);
            color: #0B0F14;
            border-color: var(--color-accent);
        }

        /* News list */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .news-item {
            display: flex;
            gap: 20px;
            padding: 20px;
            background: #fff;
            border: 1px solid #E2E8F0;
            border-radius: var(--radius);
            transition: transform var(--transition-fast), box-shadow var(--transition-med), border-color var(--transition-fast);
            align-items: center;
        }
        .news-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--color-accent);
        }
        .news-item__img {
            flex: 0 0 160px;
            border-radius: var(--radius);
            overflow: hidden;
            aspect-ratio: 16 / 10;
        }
        .news-item__img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }
        .news-item:hover .news-item__img img {
            transform: scale(1.04);
        }
        .news-item__body {
            flex: 1;
            min-width: 0;
        }
        .news-item__meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 12px;
            color: var(--color-text-light);
            margin-bottom: 6px;
        }
        .news-item__title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .news-item__title a {
            color: inherit;
            text-decoration: none;
        }
        .news-item__title a:hover {
            color: var(--color-accent);
        }
        .news-item__excerpt {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-mid);
            margin-bottom: 10px;
        }
        .news-item__link {
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .news-item__link .arrow {
            transition: transform var(--transition-med);
        }
        .news-item__link:hover .arrow {
            transform: translateX(3px);
        }

        @media (max-width: 640px) {
            .news-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                padding: 16px;
            }
            .news-item__img {
                flex: 0 0 auto;
                width: 100%;
                aspect-ratio: 16 / 9;
            }
        }

        /* Steps */
        .steps {
            display: flex;
            flex-direction: column;
            gap: 0;
            counter-reset: step;
        }
        .step {
            display: flex;
            gap: 20px;
            padding: 20px 0;
            border-bottom: 1px solid #E2E8F0;
            counter-increment: step;
        }
        .step:last-child {
            border-bottom: none;
        }
        .step__num {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: var(--radius);
            background: var(--color-accent);
            color: #0B0F14;
            font-weight: 900;
            font-size: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-mono);
        }
        .step__body {
            flex: 1;
        }
        .step__title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .step__desc {
            font-size: 14px;
            color: var(--color-text-mid);
            margin: 0;
        }
        .section--dark .step__desc {
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .step {
            border-bottom-color: var(--color-border-dark);
        }

        /* Testimonial */
        .testimonial-card {
            background: #fff;
            border: 1px solid #E2E8F0;
            border-radius: var(--radius);
            padding: 28px;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-fast);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .testimonial-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--color-accent);
        }
        .testimonial-card__quote {
            font-size: 15px;
            line-height: 1.75;
            color: var(--color-text-mid);
            margin-bottom: 20px;
            flex: 1;
        }
        .testimonial-card__author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card__avatar {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-pill);
            background: var(--color-accent);
            color: #0B0F14;
            font-weight: 900;
            font-size: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .testimonial-card__info .name {
            font-size: 14px;
            font-weight: 700;
            color: var(--color-text-dark);
        }
        .testimonial-card__info .role {
            font-size: 12px;
            color: var(--color-text-light);
        }

        /* Footer */
        .site-footer {
            background: var(--color-bg-dark);
            color: var(--color-text-dim-on-dark);
            padding: 60px 0 32px;
            border-top: 1px solid var(--color-border-dark);
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer__brand-text {
            font-size: 14px;
            line-height: 1.8;
            color: var(--color-text-dim-on-dark);
            max-width: 320px;
            margin-top: 12px;
        }
        .footer__col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--color-text-on-dark);
            margin-bottom: 16px;
        }
        .footer__links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer__links a {
            color: var(--color-text-dim-on-dark);
            text-decoration: none;
            font-size: 13px;
            transition: color var(--transition-fast);
        }
        .footer__links a:hover {
            color: var(--color-accent);
        }
        .footer__bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 20px;
            border-top: 1px solid var(--color-border-dark);
            font-size: 12px;
            color: var(--color-text-dim-on-dark);
        }
        .footer__bottom a {
            color: var(--color-text-dim-on-dark);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .footer__bottom a:hover {
            color: var(--color-accent);
        }
        .footer__legal {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        @media (max-width: 1024px) {
            .footer__grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 640px) {
            .footer__grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer__bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .site-footer {
                padding: 40px 0 24px;
            }
        }

        /* Visual banner */
        .visual-banner {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            aspect-ratio: 21 / 7;
            min-height: 240px;
            display: flex;
            align-items: flex-end;
            padding: 32px;
        }
        .visual-banner img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 0;
        }
        .visual-banner::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(11, 15, 20, 0.7) 0%, rgba(11, 15, 20, 0.2) 60%, rgba(11, 15, 20, 0.55) 100%);
            z-index: 1;
        }
        .visual-banner__content {
            position: relative;
            z-index: 2;
            color: #fff;
        }
        .visual-banner__title {
            font-size: clamp(20px, 3vw, 30px);
            font-weight: 800;
            margin-bottom: 8px;
        }
        .visual-banner__desc {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 420px;
            margin: 0;
        }

        /* Data table */
        .data-table-wrap {
            overflow-x: auto;
            border-radius: var(--radius);
            border: 1px solid var(--color-border-dark);
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
            min-width: 600px;
            background: var(--color-card-dark);
        }
        .data-table th {
            text-align: left;
            padding: 12px 16px;
            font-weight: 700;
            color: var(--color-text-dim-on-dark);
            border-bottom: 1px solid var(--color-border-dark);
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }
        .data-table td {
            padding: 12px 16px;
            color: var(--color-text-on-dark);
            border-bottom: 1px solid rgba(42, 52, 66, 0.6);
            font-family: var(--font-mono);
            font-size: 13px;
        }
        .data-table tr:last-child td {
            border-bottom: none;
        }
        .data-table tr:hover td {
            background: rgba(0, 217, 165, 0.04);
        }
        .data-table .rank {
            font-weight: 900;
            color: var(--color-accent);
        }
        .data-table .rank--top1 {
            color: var(--color-warning);
        }

        /* Image placeholder */
        .img-ph {
            background: var(--color-card-dark);
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-text-dim-on-dark);
            font-size: 13px;
            overflow: hidden;
            position: relative;
        }
        .img-ph img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .img-ph--16x9 {
            aspect-ratio: 16 / 9;
        }
        .img-ph--4x3 {
            aspect-ratio: 4 / 3;
        }
        .img-ph--1x1 {
            aspect-ratio: 1 / 1;
        }

        /* Animation */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(16px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in-up {
            animation: fadeInUp 0.6s ease forwards;
        }
        .fade-in-up--delay-1 {
            animation-delay: 0.1s;
            opacity: 0;
        }
        .fade-in-up--delay-2 {
            animation-delay: 0.2s;
            opacity: 0;
        }
        .fade-in-up--delay-3 {
            animation-delay: 0.3s;
            opacity: 0;
        }

        /* Utility */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .text-center {
            text-align: center;
        }
        .d-flex {
            display: flex;
        }
        .align-center {
            align-items: center;
        }
        .justify-center {
            justify-content: center;
        }
        .gap-2 {
            gap: 8px;
        }
        .gap-3 {
            gap: 16px;
        }
        .gap-4 {
            gap: 24px;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .w-100 {
            width: 100%;
        }
        .nowrap {
            white-space: nowrap;
        }

        /* Dark section card overrides */
        .section--dark .testimonial-card {
            background: var(--color-card-dark);
            border-color: var(--color-border-dark);
        }
        .section--dark .testimonial-card:hover {
            border-color: rgba(0, 217, 165, 0.5);
        }
        .section--dark .testimonial-card__quote {
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .testimonial-card__info .name {
            color: var(--color-text-on-dark);
        }
        .section--dark .testimonial-card__info .role {
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .faq-item {
            background: var(--color-card-dark);
            border-color: var(--color-border-dark);
        }
        .section--dark .faq-item:hover {
            border-color: rgba(0, 217, 165, 0.4);
        }
        .section--dark .faq-item.is-open {
            border-color: var(--color-accent);
        }
        .section--dark .faq-item__btn {
            color: var(--color-text-on-dark);
        }
        .section--dark .faq-item__btn:hover {
            color: var(--color-accent);
        }
        .section--dark .faq-item__icon {
            border-color: var(--color-border-dark);
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .faq-item.is-open .faq-item__icon {
            border-color: var(--color-accent);
            color: var(--color-accent);
        }
        .section--dark .faq-item__answer {
            color: var(--color-text-dim-on-dark);
            border-top-color: var(--color-border-dark);
        }
        .section--dark .news-item {
            background: var(--color-card-dark);
            border-color: var(--color-border-dark);
        }
        .section--dark .news-item:hover {
            border-color: rgba(0, 217, 165, 0.5);
        }
        .section--dark .news-item__meta {
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .news-item__title {
            color: var(--color-text-on-dark);
        }
        .section--dark .news-item__title a:hover {
            color: var(--color-accent);
        }
        .section--dark .news-item__excerpt {
            color: var(--color-text-dim-on-dark);
        }
        .section--dark .list--numbered li {
            background: var(--color-card-dark);
            border-color: var(--color-border-dark);
        }
        .section--dark .list--numbered li:hover {
            border-color: rgba(0, 217, 165, 0.5);
        }
        .section--dark .list--numbered .title {
            color: var(--color-text-on-dark);
        }
        .section--dark .list--numbered .desc {
            color: var(--color-text-dim-on-dark);
        }

        /* Scrollbar */
        ::-webkit-scrollbar {
            width: 10px;
        }
        ::-webkit-scrollbar-track {
            background: var(--color-bg-paper);
        }
        ::-webkit-scrollbar-thumb {
            background: #CBD5E0;
            border-radius: 5px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #A9B4C0;
        }
        .section--dark ::-webkit-scrollbar-track,
        .site-header ::-webkit-scrollbar-track,
        .site-footer ::-webkit-scrollbar-track {
            background: var(--color-bg-dark);
        }
        .section--dark ::-webkit-scrollbar-thumb,
        .site-header ::-webkit-scrollbar-thumb,
        .site-footer ::-webkit-scrollbar-thumb {
            background: var(--color-border-dark);
        }
        .section--dark ::-webkit-scrollbar-thumb:hover,
        .site-header ::-webkit-scrollbar-thumb:hover,
        .site-footer ::-webkit-scrollbar-thumb:hover {
            background: #3A4654;
        }

/* roulang page: category3 */
:root {
            --color-bg-dark: #0B0F14;
            --color-bg-paper: #F4F6F8;
            --color-accent: #00D9A5;
            --color-accent-hover: #00c291;
            --color-warning: #FF5C35;
            --color-card-dark: #1B232E;
            --color-border-dark: #2A3442;
            --color-positive: #2EE6A8;
            --color-negative: #FF4D4D;
            --color-text-dark: #0B0F14;
            --color-text-mid: #5A6572;
            --color-text-light: #9BA6B2;
            --color-text-on-dark: #E8EDF2;
            --color-text-dim-on-dark: #8B97A4;
            --font-sans: "Inter", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
            --radius: 4px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 8px -2px rgba(0, 0, 0, 0.12);
            --shadow-card-hover: 0 18px 40px -24px rgba(0, 0, 0, 0.65);
            --shadow-dark-card: 0 4px 14px -4px rgba(0, 0, 0, 0.45);
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --section-pad-desktop: 96px;
            --section-pad-mobile: 56px;
            --gap-section: 56px;
            --header-height: 68px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text-dark);
            background-color: var(--color-bg-paper);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            min-height: 100vh;
        }
        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
        }
        a:hover,
        a:focus {
            color: var(--color-accent-hover);
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 2px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            padding: 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        @media (max-width: 640px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }
        .section {
            padding: var(--section-pad-desktop) 0;
        }
        @media (max-width: 640px) {
            .section {
                padding: var(--section-pad-mobile) 0;
            }
        }
        .section--dark {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
        }
        .section--dark h1,
        .section--dark h2,
        .section--dark h3,
        .section--dark h4 {
            color: var(--color-text-on-dark);
        }
        .section--dark p {
            color: var(--color-text-dim-on-dark);
        }
        .section--paper {
            background: var(--color-bg-paper);
        }
        .section--carbon {
            background: #121820;
            color: var(--color-text-on-dark);
        }
        .section--carbon h2,
        .section--carbon h3,
        .section--carbon h4 {
            color: var(--color-text-on-dark);
        }
        .section--carbon p {
            color: var(--color-text-dim-on-dark);
        }
        .section__header {
            margin-bottom: 40px;
            max-width: 720px;
        }
        .section__header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section__eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 12px;
        }
        .section__title {
            font-size: clamp(26px, 3.8vw, 42px);
            font-weight: 800;
            letter-spacing: -0.015em;
            line-height: 1.2;
            margin-bottom: 16px;
        }
        .section__desc {
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text-mid);
            max-width: 620px;
        }
        .section__desc--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section--dark .section__desc {
            color: var(--color-text-dim-on-dark);
        }
        .section--carbon .section__desc {
            color: var(--color-text-dim-on-dark);
        }
        .grid {
            display: grid;
            gap: 24px;
        }
        .grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
        }
        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(11, 15, 20, 0.96);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--color-border-dark);
            min-height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 20px;
            flex-wrap: nowrap;
        }
        .site-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--color-text-on-dark);
            white-space: nowrap;
            line-height: 1;
        }
        .site-logo:hover,
        .site-logo:focus {
            color: var(--color-accent);
        }
        .site-logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            background: var(--color-accent);
            color: #0B0F14;
            border-radius: var(--radius);
            font-size: 15px;
            flex-shrink: 0;
        }
        .main-nav {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav__link {
            display: inline-flex;
            align-items: center;
            padding: 10px 14px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-dim-on-dark);
            border-bottom: 2px solid transparent;
            position: relative;
            letter-spacing: 0.01em;
            white-space: nowrap;
        }
        .main-nav__link:hover,
        .main-nav__link:focus {
            color: var(--color-text-on-dark);
        }
        .main-nav__link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--color-accent);
            transition: width var(--transition-med);
        }
        .main-nav__link:hover::after,
        .main-nav__link:focus::after,
        .main-nav__link--active::after {
            width: 100%;
        }
        .main-nav__link--active {
            color: var(--color-accent);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header-search {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            color: var(--color-text-dim-on-dark);
            transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
        }
        .header-search:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
            transform: rotate(8deg);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            background: var(--color-accent);
            color: #0B0F14;
            font-weight: 700;
            font-size: 14px;
            border-radius: var(--radius);
            line-height: 1.4;
            white-space: nowrap;
            position: relative;
            overflow: hidden;
            transition: background var(--transition-fast), box-shadow var(--transition-med);
            box-shadow: none;
        }
        .btn-primary::before {
            content: '';
            position: absolute;
            inset: 0;
            background: #00c291;
            transform: translateX(-100%);
            transition: transform var(--transition-med);
            z-index: 0;
            border-radius: var(--radius);
        }
        .btn-primary span,
        .btn-primary i {
            position: relative;
            z-index: 1;
        }
        .btn-primary:hover::before {
            transform: translateX(0);
        }
        .btn-primary:hover {
            box-shadow: 0 10px 24px -10px rgba(0, 217, 165, 0.4);
        }
        .btn-primary:focus-visible {
            outline-color: var(--color-accent);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            background: transparent;
            color: var(--color-accent);
            border: 1px solid var(--color-accent);
            font-weight: 700;
            font-size: 14px;
            border-radius: var(--radius);
            line-height: 1.4;
            white-space: nowrap;
            transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
        }
        .btn-secondary:hover {
            background: var(--color-accent);
            color: #0B0F14;
            border-color: var(--color-accent);
        }
        .hamburger {
            display: none;
            width: 40px;
            height: 40px;
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            align-items: center;
            justify-content: center;
            color: var(--color-text-on-dark);
            font-size: 17px;
            flex-shrink: 0;
            transition: border-color var(--transition-fast), color var(--transition-fast);
        }
        .hamburger:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
        }
        @media (max-width: 1024px) {
            .main-nav {
                gap: 0;
            }
            .main-nav__link {
                padding: 10px 10px;
                font-size: 13px;
            }
        }
        @media (max-width: 640px) {
            .hamburger {
                display: inline-flex;
            }
            .main-nav {
                display: none;
            }
            .header-actions {
                gap: 8px;
            }
            .header-actions .btn-primary {
                display: none;
            }
            .header-search {
                display: none;
            }
            .header-inner {
                flex-wrap: nowrap;
            }
        }
        /* Mobile drawer */
        .mobile-drawer {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: var(--color-bg-dark);
            z-index: 200;
            transform: translateX(-100%);
            transition: transform var(--transition-med);
            display: flex;
            flex-direction: column;
            padding: 20px 24px;
            overflow-y: auto;
        }
        .mobile-drawer--open {
            transform: translateX(0);
        }
        .mobile-drawer__top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
        }
        .mobile-drawer__close {
            width: 40px;
            height: 40px;
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            color: var(--color-text-on-dark);
            font-size: 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: border-color var(--transition-fast), color var(--transition-fast);
        }
        .mobile-drawer__close:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
        }
        .mobile-drawer__nav {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .mobile-drawer__link {
            display: block;
            padding: 16px 14px;
            font-size: 18px;
            font-weight: 700;
            color: var(--color-text-on-dark);
            border-bottom: 1px solid var(--color-border-dark);
            transition: color var(--transition-fast), padding-left var(--transition-fast);
        }
        .mobile-drawer__link:hover {
            color: var(--color-accent);
            padding-left: 20px;
        }
        .mobile-drawer__link--active {
            color: var(--color-accent);
            border-left: 3px solid var(--color-accent);
            padding-left: 17px;
        }
        /* Category header */
        .category-hero {
            background: var(--color-bg-dark);
            padding: 56px 0 40px;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--color-border-dark);
        }
        .category-hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 60%;
            height: 180%;
            background: radial-gradient(circle at center, rgba(0, 217, 165, 0.08), transparent 65%);
            pointer-events: none;
        }
        .breadcrumb {
            list-style: none;
            margin: 0 0 20px 0;
            padding: 0;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-text-dim-on-dark);
            flex-wrap: wrap;
        }
        .breadcrumb li {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .breadcrumb a {
            color: var(--color-text-dim-on-dark);
            transition: color var(--transition-fast);
        }
        .breadcrumb a:hover {
            color: var(--color-accent);
        }
        .breadcrumb .separator {
            color: var(--color-text-dim-on-dark);
            opacity: 0.5;
        }
        .category-hero h1 {
            font-size: clamp(32px, 4.5vw, 52px);
            font-weight: 900;
            letter-spacing: -0.02em;
            line-height: 1.15;
            color: var(--color-text-on-dark);
            margin: 0 0 16px 0;
        }
        .category-hero__desc {
            font-size: 16px;
            line-height: 1.8;
            color: var(--color-text-dim-on-dark);
            max-width: 680px;
            margin: 0;
        }
        /* Filter chips */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .filter-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-dim-on-dark);
            background: transparent;
            transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
            cursor: pointer;
        }
        .filter-chip:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
        }
        .filter-chip--active {
            background: var(--color-accent);
            border-color: var(--color-accent);
            color: #0B0F14;
        }
        /* Article list cards */
        .article-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .article-card {
            display: grid;
            grid-template-columns: 240px 1fr;
            gap: 24px;
            background: #FFFFFF;
            border: 1px solid #E3E7EB;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-fast);
            padding: 0;
        }
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: #C9D2DB;
        }
        .article-card__thumb {
            width: 100%;
            height: 100%;
            min-height: 160px;
            overflow: hidden;
            position: relative;
            aspect-ratio: 4 / 3;
        }
        .article-card__thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }
        .article-card:hover .article-card__thumb img {
            transform: scale(1.03);
        }
        .article-card__body {
            padding: 20px 20px 20px 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
            min-width: 0;
        }
        .article-card__meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--color-text-light);
            flex-wrap: wrap;
        }
        .article-card__date {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .article-card__tag {
            display: inline-block;
            padding: 2px 10px;
            font-size: 11px;
            font-weight: 700;
            background: #EAFCF7;
            color: #007F5F;
            border-radius: var(--radius-pill);
            letter-spacing: 0.02em;
        }
        .article-card__title {
            font-size: 18px;
            font-weight: 800;
            line-height: 1.35;
            margin: 0;
            letter-spacing: -0.01em;
        }
        .article-card__title a {
            color: var(--color-text-dark);
            transition: color var(--transition-fast);
        }
        .article-card__title a:hover {
            color: var(--color-accent);
        }
        .article-card__excerpt {
            font-size: 14px;
            color: var(--color-text-mid);
            line-height: 1.7;
            margin: 0;
            flex: 1;
        }
        .article-card__more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            text-transform: uppercase;
            letter-spacing: 0.04em;
            position: relative;
            align-self: flex-start;
            transition: color var(--transition-fast), gap var(--transition-fast);
        }
        .article-card__more::after {
            content: '';
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 0;
            height: 1px;
            background: var(--color-accent);
            transition: width var(--transition-med);
        }
        .article-card__more:hover {
            gap: 10px;
            color: var(--color-accent-hover);
        }
        .article-card__more:hover::after {
            width: 100%;
        }
        @media (max-width: 768px) {
            .article-card {
                grid-template-columns: 1fr;
            }
            .article-card__thumb {
                min-height: 180px;
                aspect-ratio: 16 / 9;
            }
            .article-card__body {
                padding: 20px;
            }
        }
        @media (max-width: 640px) {
            .article-card__thumb {
                min-height: 160px;
            }
        }
        /* Pinned cards */
        .pinned-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .pinned-card {
            background: var(--color-bg-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            overflow: hidden;
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-fast);
            position: relative;
        }
        .pinned-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(0, 217, 165, 0.35);
        }
        .pinned-card__badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--color-warning);
            color: #FFFFFF;
            font-size: 11px;
            font-weight: 800;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            z-index: 2;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }
        .pinned-card__thumb {
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
        }
        .pinned-card__thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }
        .pinned-card:hover .pinned-card__thumb img {
            transform: scale(1.04);
        }
        .pinned-card__body {
            padding: 18px 20px 20px;
        }
        .pinned-card__title {
            font-size: 16px;
            font-weight: 800;
            line-height: 1.4;
            margin: 0 0 8px;
            color: var(--color-text-on-dark);
        }
        .pinned-card__title a {
            color: var(--color-text-on-dark);
            transition: color var(--transition-fast);
        }
        .pinned-card__title a:hover {
            color: var(--color-accent);
        }
        .pinned-card__meta {
            font-size: 12px;
            color: var(--color-text-dim-on-dark);
        }
        @media (max-width: 1024px) {
            .pinned-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .pinned-grid {
                grid-template-columns: 1fr;
            }
        }
        /* Stats metrics */
        .metric-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .metric-item {
            padding: 24px;
            border-left: 3px solid var(--color-accent);
            background: #FFFFFF;
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            transition: transform var(--transition-med), box-shadow var(--transition-med);
        }
        .metric-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }
        .metric-item__value {
            font-size: 32px;
            font-weight: 900;
            letter-spacing: -0.02em;
            color: var(--color-text-dark);
            line-height: 1.2;
            margin-bottom: 6px;
            font-family: var(--font-mono);
        }
        .metric-item__label {
            font-size: 14px;
            color: var(--color-text-mid);
            line-height: 1.5;
        }
        @media (max-width: 640px) {
            .metric-row {
                grid-template-columns: 1fr;
                gap: 14px;
            }
        }
        /* Tag cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .tag-cloud__link {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            background: #FFFFFF;
            border: 1px solid #E3E7EB;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-mid);
            transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
        }
        .tag-cloud__link:hover {
            border-color: var(--color-accent);
            color: var(--color-accent);
            background: #F0FDFA;
        }
        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 760px;
        }
        .faq-item {
            border: 1px solid #E3E7EB;
            border-radius: var(--radius);
            background: #FFFFFF;
            overflow: hidden;
            transition: border-color var(--transition-fast), box-shadow var(--transition-med);
        }
        .faq-item--open {
            border-color: var(--color-accent);
            box-shadow: 0 8px 24px -12px rgba(0, 217, 165, 0.25);
        }
        .faq-item__question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            text-align: left;
            font-size: 15px;
            font-weight: 700;
            color: var(--color-text-dark);
            background: transparent;
            transition: color var(--transition-fast);
        }
        .faq-item__question:hover {
            color: var(--color-accent);
        }
        .faq-item__icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #D3D9E0;
            border-radius: var(--radius);
            font-size: 12px;
            color: var(--color-text-mid);
            transition: transform var(--transition-med), border-color var(--transition-fast), color var(--transition-fast);
        }
        .faq-item--open .faq-item__icon {
            transform: rotate(180deg);
            border-color: var(--color-accent);
            color: var(--color-accent);
        }
        .faq-item__answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-med), padding var(--transition-med);
            padding: 0 20px;
        }
        .faq-item--open .faq-item__answer {
            max-height: 260px;
            padding: 0 20px 18px;
        }
        .faq-item__answer p {
            margin: 0;
            font-size: 14px;
            color: var(--color-text-mid);
            line-height: 1.75;
        }
        /* CTA section */
        .cta-panel {
            background: var(--color-bg-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            padding: 44px 40px;
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 32px;
            align-items: center;
            position: relative;
            overflow: hidden;
        }
        .cta-panel::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -5%;
            width: 40%;
            height: 200%;
            background: radial-gradient(circle at center, rgba(0, 217, 165, 0.1), transparent 60%);
            pointer-events: none;
        }
        .cta-panel__title {
            font-size: 26px;
            font-weight: 900;
            letter-spacing: -0.015em;
            line-height: 1.25;
            margin: 0 0 12px;
            color: var(--color-text-on-dark);
        }
        .cta-panel__desc {
            font-size: 15px;
            color: var(--color-text-dim-on-dark);
            margin: 0 0 20px;
            line-height: 1.7;
            max-width: 540px;
        }
        .cta-panel__progress {
            width: 100%;
            max-width: 380px;
            margin-bottom: 20px;
        }
        .cta-progress__label {
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: var(--color-text-dim-on-dark);
            margin-bottom: 6px;
            letter-spacing: 0.04em;
            font-weight: 600;
        }
        .cta-progress__bar {
            height: 6px;
            background: var(--color-border-dark);
            border-radius: var(--radius-pill);
            overflow: hidden;
        }
        .cta-progress__fill {
            height: 100%;
            background: var(--color-accent);
            border-radius: var(--radius-pill);
            width: 72%;
            transition: width var(--transition-med);
        }
        .cta-panel__actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-panel__form {
            display: flex;
            flex-direction: column;
            gap: 12px;
            min-width: 280px;
            max-width: 360px;
            position: relative;
            z-index: 1;
        }
        .cta-input {
            width: 100%;
            padding: 12px 16px;
            background: #121820;
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            color: var(--color-text-on-dark);
            font-size: 14px;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .cta-input::placeholder {
            color: var(--color-text-dim-on-dark);
        }
        .cta-input:focus {
            border-color: var(--color-accent);
            box-shadow: 0 0 0 3px rgba(0, 217, 165, 0.15);
            outline: none;
        }
        .cta-input--dark {
            background: #0B0F14;
        }
        @media (max-width: 768px) {
            .cta-panel {
                grid-template-columns: 1fr;
                padding: 32px 24px;
            }
            .cta-panel__form {
                min-width: 100%;
                max-width: 100%;
            }
        }
        /* Footer */
        .site-footer {
            background: var(--color-bg-dark);
            padding: 56px 0 28px;
            border-top: 1px solid var(--color-border-dark);
            color: var(--color-text-dim-on-dark);
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer__brand-text {
            font-size: 14px;
            color: var(--color-text-dim-on-dark);
            line-height: 1.7;
            margin: 16px 0 0;
            max-width: 280px;
        }
        .footer__col h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--color-text-on-dark);
            margin: 0 0 14px;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }
        .footer__links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer__links a {
            font-size: 14px;
            color: var(--color-text-dim-on-dark);
            transition: color var(--transition-fast);
        }
        .footer__links a:hover {
            color: var(--color-accent);
        }
        .footer__bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding-top: 24px;
            border-top: 1px solid var(--color-border-dark);
            font-size: 13px;
            flex-wrap: wrap;
        }
        .footer__legal {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .footer__legal a {
            color: var(--color-text-dim-on-dark);
            transition: color var(--transition-fast);
        }
        .footer__legal a:hover {
            color: var(--color-accent);
        }
        @media (max-width: 1024px) {
            .footer__grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 640px) {
            .footer__grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer__bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        /* Utility */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            white-space: nowrap;
            border: 0;
        }
        .mt-0 { margin-top: 0; }
        .mb-0 { margin-bottom: 0; }
        .w-full { width: 100%; }

/* roulang page: category2 */
:root {
            --color-bg-dark: #0B0F14;
            --color-bg-paper: #F4F6F8;
            --color-accent: #00D9A5;
            --color-warning: #FF5C35;
            --color-card-dark: #1B232E;
            --color-border-dark: #2A3442;
            --color-positive: #2EE6A8;
            --color-negative: #FF4D4D;
            --color-text-dark: #0B0F14;
            --color-text-mid: #5A6572;
            --color-text-light: #9BA6B2;
            --color-text-on-dark: #E8EDF2;
            --color-text-dim-on-dark: #8B97A4;
            --font-sans: "Inter", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
            --radius: 4px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 8px -2px rgba(0, 0, 0, 0.12);
            --shadow-card-hover: 0 18px 40px -24px rgba(0, 0, 0, 0.65);
            --shadow-dark-card: 0 4px 14px -4px rgba(0, 0, 0, 0.45);
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --section-pad-desktop: 96px;
            --section-pad-mobile: 56px;
            --gap-section: 56px;
            --header-height: 68px;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text-dark);
            background-color: var(--color-bg-paper);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
        }

        a:hover,
        a:focus {
            color: #00c291;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 2px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
            padding: 0;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .section {
            padding: var(--section-pad-desktop) 0;
        }

        .section--dark {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
        }

        .section--dark h1,
        .section--dark h2,
        .section--dark h3,
        .section--dark h4 {
            color: var(--color-text-on-dark);
        }

        .section--dark p {
            color: var(--color-text-dim-on-dark);
        }

        .section--paper {
            background: var(--color-bg-paper);
        }

        .section--carbon {
            background: #121820;
            color: var(--color-text-on-dark);
        }

        .section--carbon h2,
        .section--carbon h3,
        .section--carbon h4 {
            color: var(--color-text-on-dark);
        }

        .section--carbon p {
            color: var(--color-text-dim-on-dark);
        }

        .section--accent-tint {
            background: #EAFCF7;
        }

        .section--grid-pattern {
            background-image:
                linear-gradient(rgba(15, 32, 28, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(15, 32, 28, 0.04) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        .section__header {
            margin-bottom: 40px;
            max-width: 720px;
        }

        .section__header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section__eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 12px;
        }

        .section__title {
            font-size: clamp(26px, 3.8vw, 42px);
            font-weight: 800;
            letter-spacing: -0.015em;
            line-height: 1.2;
            margin-bottom: 16px;
        }

        .section__desc {
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text-mid);
            max-width: 620px;
        }

        .section--dark .section__desc,
        .section--dark .section__desc p {
            color: var(--color-text-dim-on-dark);
        }

        .grid {
            display: grid;
            gap: 24px;
        }

        .grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }

        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }

        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--color-bg-dark);
            border-bottom: 1px solid var(--color-border-dark);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }

        .header__inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }

        .header__left {
            display: flex;
            align-items: center;
            gap: 32px;
            flex: 1;
            min-width: 0;
        }

        .header__right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }

        .site-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 19px;
            font-weight: 900;
            letter-spacing: -0.02em;
            color: var(--color-text-on-dark);
            white-space: nowrap;
        }

        .site-logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: var(--radius);
            background: var(--color-accent);
            color: var(--color-bg-dark);
            font-size: 15px;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .main-nav__item {
            position: relative;
        }

        .main-nav__link {
            display: inline-block;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-dim-on-dark);
            position: relative;
            white-space: nowrap;
            transition: color var(--transition-fast);
        }

        .main-nav__link::after {
            content: "";
            position: absolute;
            left: 12px;
            right: 12px;
            bottom: 2px;
            height: 2px;
            background: var(--color-accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform var(--transition-med);
        }

        .main-nav__link:hover,
        .main-nav__link:focus {
            color: var(--color-text-on-dark);
        }

        .main-nav__link:hover::after,
        .main-nav__link:focus::after {
            transform: scaleX(1);
        }

        .main-nav__link--active {
            color: var(--color-accent);
        }

        .main-nav__link--active::after {
            transform: scaleX(1);
        }

        .header-search-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--color-border-dark);
            color: var(--color-text-dim-on-dark);
            font-size: 15px;
            transition: all var(--transition-fast);
            background: transparent;
        }

        .header-search-btn:hover,
        .header-search-btn:focus {
            border-color: var(--color-accent);
            color: var(--color-accent);
            transform: rotate(8deg);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 700;
            font-size: 14px;
            border-radius: var(--radius);
            padding: 11px 22px;
            transition: all var(--transition-med);
            position: relative;
            overflow: hidden;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .btn--primary {
            background: var(--color-accent);
            color: var(--color-bg-dark);
            border: 1px solid var(--color-accent);
        }

        .btn--primary .btn__arrow {
            display: inline-block;
            transition: transform var(--transition-med);
        }

        .btn--primary:hover,
        .btn--primary:focus {
            background: #00c291;
            border-color: #00c291;
            color: var(--color-bg-dark);
        }

        .btn--primary:hover .btn__arrow,
        .btn--primary:focus .btn__arrow {
            transform: translateX(4px);
        }

        .btn--outline {
            background: transparent;
            color: var(--color-text-on-dark);
            border: 1px solid var(--color-border-dark);
        }

        .btn--outline:hover,
        .btn--outline:focus {
            border-color: var(--color-accent);
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.06);
        }

        .btn--sm {
            padding: 8px 16px;
            font-size: 13px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            padding: 8px;
            border-radius: var(--radius);
            border: 1px solid var(--color-border-dark);
            background: transparent;
            transition: all var(--transition-fast);
        }

        .hamburger__line {
            display: block;
            width: 100%;
            height: 2px;
            background: var(--color-text-on-dark);
            border-radius: 2px;
            transition: all var(--transition-med);
        }

        .hamburger:hover,
        .hamburger:focus {
            border-color: var(--color-accent);
        }

        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--color-bg-dark);
            z-index: 99;
            padding: 32px 24px;
            overflow-y: auto;
        }

        .mobile-nav-overlay.is-open {
            display: block;
        }

        .mobile-nav-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .mobile-nav-link {
            display: block;
            padding: 14px 16px;
            font-size: 17px;
            font-weight: 700;
            color: var(--color-text-on-dark);
            border-radius: var(--radius);
            transition: all var(--transition-fast);
        }

        .mobile-nav-link:hover,
        .mobile-nav-link:focus {
            background: var(--color-card-dark);
            color: var(--color-accent);
        }

        .mobile-nav-link--active {
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.08);
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-text-dim-on-dark);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--color-accent);
        }

        .breadcrumb a:hover,
        .breadcrumb a:focus {
            color: #00c291;
        }

        .breadcrumb__sep {
            color: var(--color-border-dark);
            font-size: 11px;
        }

        .breadcrumb .breadcrumb__current {
            color: var(--color-text-on-dark);
            font-weight: 600;
        }

        /* Category Hero Header */
        .cat-hero {
            background: var(--color-bg-dark);
            padding: 48px 0 56px;
            border-bottom: 1px solid var(--color-border-dark);
        }

        .cat-hero__title {
            font-size: clamp(32px, 5vw, 52px);
            font-weight: 900;
            letter-spacing: -0.02em;
            line-height: 1.15;
            color: var(--color-text-on-dark);
            margin-bottom: 16px;
        }

        .cat-hero__title .highlight {
            color: var(--color-accent);
        }

        .cat-hero__desc {
            font-size: 16px;
            color: var(--color-text-dim-on-dark);
            max-width: 640px;
            line-height: 1.75;
        }

        /* Filter tags */
        .filter-section {
            padding: 32px 0;
            background: var(--color-bg-paper);
            border-bottom: 1px solid rgba(10, 15, 20, 0.06);
        }

        .filter-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .filter-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-mid);
            background: #fff;
            border: 1px solid #DCE2E8;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .filter-tag:hover,
        .filter-tag:focus {
            border-color: var(--color-accent);
            color: var(--color-accent);
        }

        .filter-tag--active {
            background: var(--color-accent);
            border-color: var(--color-accent);
            color: var(--color-bg-dark);
        }

        .filter-tag--active:hover,
        .filter-tag--active:focus {
            background: #00c291;
            border-color: #00c291;
            color: var(--color-bg-dark);
        }

        /* Card list */
        .card-list-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .card-item {
            display: flex;
            flex-direction: column;
            background: #fff;
            border: 1px solid #E3E8EE;
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition-med);
            box-shadow: var(--shadow-card);
            height: 100%;
        }

        .card-item:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-card-hover);
            border-color: #B8C2CD;
        }

        .card-item__media {
            position: relative;
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--color-card-dark);
            flex-shrink: 0;
        }

        .card-item__media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }

        .card-item:hover .card-item__media img {
            transform: scale(1.03);
        }

        .card-item__badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--color-accent);
            color: var(--color-bg-dark);
            font-size: 11px;
            font-weight: 800;
            padding: 5px 12px;
            border-radius: var(--radius-pill);
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .card-item__body {
            padding: 20px 22px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .card-item__meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: var(--color-text-light);
            margin-bottom: 10px;
            flex-wrap: wrap;
        }

        .card-item__date {
            font-family: var(--font-mono);
            font-size: 12px;
            color: var(--color-text-light);
        }

        .card-item__tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: var(--radius-pill);
            font-size: 11px;
            font-weight: 700;
            background: #EEF2F6;
            color: var(--color-text-mid);
            letter-spacing: 0.04em;
        }

        .card-item__title {
            font-size: 18px;
            font-weight: 800;
            line-height: 1.4;
            color: var(--color-text-dark);
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }

        .card-item__summary {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-mid);
            margin-bottom: 16px;
            flex: 1;
        }

        .card-item__link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            align-self: flex-start;
            transition: all var(--transition-fast);
        }

        .card-item__link .card-item__link-arrow {
            display: inline-block;
            transition: transform var(--transition-fast);
        }

        .card-item__link:hover,
        .card-item__link:focus {
            color: #00c291;
        }

        .card-item__link:hover .card-item__link-arrow,
        .card-item__link:focus .card-item__link-arrow {
            transform: translateX(3px);
        }

        /* Hot pinned items */
        .hot-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .hot-card {
            display: flex;
            flex-direction: column;
            background: var(--color-card-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition-med);
            box-shadow: var(--shadow-dark-card);
        }

        .hot-card:hover {
            transform: translateY(-5px);
            border-color: #3A4656;
            box-shadow: 0 18px 40px -24px rgba(0, 0, 0, 0.7);
        }

        .hot-card__media {
            aspect-ratio: 16/9;
            overflow: hidden;
            position: relative;
        }

        .hot-card__media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }

        .hot-card:hover .hot-card__media img {
            transform: scale(1.04);
        }

        .hot-card__pin {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--color-warning);
            color: #fff;
            font-size: 11px;
            font-weight: 800;
            padding: 5px 12px;
            border-radius: var(--radius-pill);
            letter-spacing: 0.05em;
            text-transform: uppercase;
        }

        .hot-card__body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .hot-card__rank {
            font-size: 28px;
            font-weight: 900;
            font-family: var(--font-mono);
            color: var(--color-accent);
            line-height: 1;
            margin-bottom: 10px;
        }

        .hot-card__title {
            font-size: 16px;
            font-weight: 700;
            line-height: 1.45;
            color: var(--color-text-on-dark);
            margin-bottom: 8px;
        }

        .hot-card__meta {
            font-size: 12px;
            color: var(--color-text-dim-on-dark);
            margin-top: auto;
        }

        /* Stats bar */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .stat-block {
            text-align: center;
            padding: 28px 20px;
            background: var(--color-card-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            transition: all var(--transition-fast);
        }

        .stat-block:hover {
            border-color: var(--color-accent);
            transform: translateY(-3px);
        }

        .stat-block__value {
            font-size: 36px;
            font-weight: 900;
            font-family: var(--font-mono);
            color: var(--color-accent);
            line-height: 1.2;
            margin-bottom: 6px;
            letter-spacing: -0.02em;
        }

        .stat-block__unit {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-dim-on-dark);
        }

        .stat-block__label {
            font-size: 13px;
            color: var(--color-text-dim-on-dark);
            margin-top: 8px;
        }

        /* Topic cloud */
        .topic-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .topic-cloud__item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 18px;
            border-radius: var(--radius);
            font-size: 13px;
            font-weight: 600;
            background: #fff;
            border: 1px solid #DCE2E8;
            color: var(--color-text-mid);
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .topic-cloud__item:hover,
        .topic-cloud__item:focus {
            border-color: var(--color-accent);
            color: var(--color-accent);
            background: #F0FDF9;
        }

        .topic-cloud__item .topic-cloud__icon {
            font-size: 14px;
            color: var(--color-accent);
        }

        /* FAQ */
        .faq-list {
            list-style: none;
            padding: 0;
            margin: 0;
            max-width: 760px;
        }

        .faq-item {
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            margin-bottom: 12px;
            overflow: hidden;
            background: var(--color-card-dark);
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: #3A4656;
        }

        .faq-item.is-open {
            border-color: var(--color-accent);
        }

        .faq-item__header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            cursor: pointer;
            width: 100%;
            text-align: left;
            background: transparent;
            border: none;
            transition: all var(--transition-fast);
        }

        .faq-item__question {
            font-size: 15px;
            font-weight: 700;
            color: var(--color-text-on-dark);
            margin: 0;
        }

        .faq-item__icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-pill);
            border: 1px solid var(--color-border-dark);
            color: var(--color-text-dim-on-dark);
            font-size: 12px;
            transition: all var(--transition-fast);
        }

        .faq-item.is-open .faq-item__icon {
            transform: rotate(180deg);
            border-color: var(--color-accent);
            color: var(--color-accent);
        }

        .faq-item__answer-wrap {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-med);
        }

        .faq-item.is-open .faq-item__answer-wrap {
            max-height: 400px;
        }

        .faq-item__answer {
            padding: 0 20px 20px;
            font-size: 14px;
            line-height: 1.75;
            color: var(--color-text-dim-on-dark);
            margin: 0;
        }

        /* CTA Form */
        .cta-box {
            background: var(--color-bg-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }

        .cta-box__content {
            flex: 1;
            min-width: 280px;
        }

        .cta-box__title {
            font-size: 28px;
            font-weight: 900;
            color: var(--color-text-on-dark);
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }

        .cta-box__desc {
            font-size: 15px;
            color: var(--color-text-dim-on-dark);
            margin: 0;
        }

        .cta-form {
            display: flex;
            gap: 12px;
            flex-shrink: 0;
            flex-wrap: wrap;
        }

        .cta-form__input {
            flex: 1;
            min-width: 220px;
            padding: 12px 16px;
            border-radius: var(--radius);
            border: 1px solid var(--color-border-dark);
            background: var(--color-card-dark);
            color: var(--color-text-on-dark);
            font-size: 14px;
            transition: all var(--transition-fast);
        }

        .cta-form__input::placeholder {
            color: var(--color-text-dim-on-dark);
        }

        .cta-form__input:focus {
            border-color: var(--color-accent);
            outline: none;
            box-shadow: 0 0 0 3px rgba(0, 217, 165, 0.12);
        }

        /* Footer */
        .site-footer {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
            padding: 64px 0 32px;
            border-top: 1px solid var(--color-border-dark);
        }

        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 48px;
        }

        .footer__brand-text {
            font-size: 14px;
            color: var(--color-text-dim-on-dark);
            margin-top: 16px;
            max-width: 300px;
            line-height: 1.7;
        }

        .footer__col h4 {
            font-size: 13px;
            font-weight: 800;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--color-text-on-dark);
            margin-bottom: 16px;
        }

        .footer__links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer__links a {
            font-size: 14px;
            color: var(--color-text-dim-on-dark);
            transition: color var(--transition-fast);
        }

        .footer__links a:hover,
        .footer__links a:focus {
            color: var(--color-accent);
        }

        .footer__bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            padding-top: 24px;
            border-top: 1px solid var(--color-border-dark);
            font-size: 13px;
            color: var(--color-text-dim-on-dark);
        }

        .footer__legal {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer__legal a {
            color: var(--color-text-dim-on-dark);
        }

        .footer__legal a:hover,
        .footer__legal a:focus {
            color: var(--color-accent);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }

            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }

            .card-list-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .hot-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .stats-bar {
                grid-template-columns: repeat(3, 1fr);
            }

            .footer__grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .header__left {
                gap: 20px;
            }

            .main-nav {
                gap: 2px;
            }

            .main-nav__link {
                padding: 8px 8px;
                font-size: 13px;
            }
        }

        @media (max-width: 848px) {
            .main-nav {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .header__right .btn {
                display: none;
            }

            .card-list-grid {
                grid-template-columns: 1fr;
            }

            .hot-grid {
                grid-template-columns: 1fr;
            }

            .grid-2 {
                grid-template-columns: 1fr;
            }

            .grid-3 {
                grid-template-columns: 1fr;
            }

            .grid-4 {
                grid-template-columns: 1fr;
            }

            .stats-bar {
                grid-template-columns: 1fr;
            }

            .cta-box {
                flex-direction: column;
                align-items: stretch;
                text-align: center;
            }

            .cta-form {
                flex-direction: column;
            }

            .cta-form__input {
                min-width: 100%;
            }
        }

        @media (max-width: 640px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .section {
                padding: var(--section-pad-mobile) 0;
            }

            .cat-hero {
                padding: 32px 0 40px;
            }

            .cat-hero__title {
                font-size: 28px;
            }

            .card-item__body {
                padding: 16px 18px 18px;
            }

            .card-item__title {
                font-size: 16px;
            }

            .footer__grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .footer__bottom {
                flex-direction: column;
                text-align: center;
                gap: 12px;
            }

            .stat-block__value {
                font-size: 28px;
            }

            .cta-box {
                padding: 32px 24px;
            }
        }

/* roulang page: category1 */
:root {
            --color-bg-dark: #0B0F14;
            --color-bg-paper: #F4F6F8;
            --color-accent: #00D9A5;
            --color-warning: #FF5C35;
            --color-card-dark: #1B232E;
            --color-border-dark: #2A3442;
            --color-positive: #2EE6A8;
            --color-negative: #FF4D4D;
            --color-text-dark: #0B0F14;
            --color-text-mid: #5A6572;
            --color-text-light: #9BA6B2;
            --color-text-on-dark: #E8EDF2;
            --color-text-dim-on-dark: #8B97A4;
            --font-sans: "Inter", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
            --radius: 4px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 8px -2px rgba(0, 0, 0, 0.12);
            --shadow-card-hover: 0 18px 40px -24px rgba(0, 0, 0, 0.65);
            --shadow-dark-card: 0 4px 14px -4px rgba(0, 0, 0, 0.45);
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --section-pad-desktop: 96px;
            --section-pad-mobile: 56px;
            --gap-section: 56px;
            --header-height: 68px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text-dark);
            background-color: var(--color-bg-paper);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }
        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
        }
        a:hover,
        a:focus {
            color: #00c291;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 2px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            padding: 0;
            color: inherit;
        }
        ul,
        ol {
            margin: 0;
            padding: 0;
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            margin: 0 0 0.5em;
            font-weight: 700;
            line-height: 1.25;
            color: var(--color-text-dark);
        }
        p {
            margin: 0 0 1em;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section {
            padding: var(--section-pad-desktop) 0;
        }
        .section--dark {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
        }
        .section--dark h1,
        .section--dark h2,
        .section--dark h3,
        .section--dark h4 {
            color: var(--color-text-on-dark);
        }
        .section--dark p {
            color: var(--color-text-dim-on-dark);
        }
        .section--paper {
            background: var(--color-bg-paper);
        }
        .section--carbon {
            background: #121820;
            color: var(--color-text-on-dark);
        }
        .section--carbon h2,
        .section--carbon h3,
        .section--carbon h4 {
            color: var(--color-text-on-dark);
        }
        .section--carbon p {
            color: var(--color-text-dim-on-dark);
        }
        .section--accent-tint {
            background: #EAFCF7;
        }
        .section--grid-pattern {
            background-image: linear-gradient(rgba(15, 32, 28, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(15, 32, 28, 0.04) 1px, transparent 1px);
            background-size: 32px 32px;
        }
        .section__header {
            margin-bottom: 40px;
            max-width: 720px;
        }
        .section__header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .section__eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 12px;
        }
        .section__title {
            font-size: clamp(26px, 3.8vw, 42px);
            font-weight: 800;
            letter-spacing: -0.015em;
            line-height: 1.2;
            margin-bottom: 16px;
        }
        .section__desc {
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text-mid);
            max-width: 620px;
        }
        .section--dark .section__desc {
            color: var(--color-text-dim-on-dark);
        }
        .grid {
            display: grid;
            gap: 24px;
        }
        .grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }
        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 700;
            font-size: 15px;
            line-height: 1;
            padding: 14px 24px;
            border-radius: var(--radius);
            position: relative;
            overflow: hidden;
            transition: color var(--transition-med), background var(--transition-med), border-color var(--transition-med), transform var(--transition-fast), box-shadow var(--transition-med);
            white-space: nowrap;
            border: 1px solid transparent;
        }
        .btn--primary {
            background: var(--color-accent);
            color: #0B0F14;
            border-color: var(--color-accent);
        }
        .btn--primary:hover,
        .btn--primary:focus {
            background: #00c291;
            border-color: #00c291;
            color: #0B0F14;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px -12px rgba(0, 217, 165, 0.6);
        }
        .btn--outline-light {
            background: transparent;
            color: var(--color-text-on-dark);
            border-color: var(--color-border-dark);
        }
        .btn--outline-light:hover,
        .btn--outline-light:focus {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--color-accent);
            color: var(--color-accent);
            transform: translateY(-2px);
        }
        .btn--outline-dark {
            background: transparent;
            color: var(--color-text-dark);
            border-color: #C9D1D9;
        }
        .btn--outline-dark:hover,
        .btn--outline-dark:focus {
            background: var(--color-bg-dark);
            border-color: var(--color-bg-dark);
            color: var(--color-accent);
            transform: translateY(-2px);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.04em;
            padding: 4px 10px;
            border-radius: var(--radius-pill);
            line-height: 1.4;
            white-space: nowrap;
        }
        .badge--accent {
            background: rgba(0, 217, 165, 0.14);
            color: #00D9A5;
        }
        .badge--warning {
            background: rgba(255, 92, 53, 0.14);
            color: #FF5C35;
        }
        .badge--dark {
            background: rgba(11, 15, 20, 0.08);
            color: #0B0F14;
        }
        .badge--outline-dark {
            background: transparent;
            border: 1px solid var(--color-border-dark);
            color: var(--color-text-dim-on-dark);
        }
        .tag-pill {
            display: inline-block;
            padding: 8px 16px;
            font-size: 13px;
            font-weight: 600;
            border-radius: var(--radius-pill);
            background: var(--color-bg-paper);
            border: 1px solid #D8DEE5;
            color: var(--color-text-mid);
            transition: all var(--transition-fast);
            cursor: default;
            line-height: 1.3;
        }
        .tag-pill:hover {
            border-color: var(--color-accent);
            color: #00c291;
            background: rgba(0, 217, 165, 0.06);
        }
        .tag-pill--active {
            background: var(--color-bg-dark);
            border-color: var(--color-bg-dark);
            color: var(--color-accent);
        }
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(244, 246, 248, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(11, 15, 20, 0.08);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition-med);
        }
        .site-header--dark {
            background: rgba(11, 15, 20, 0.96);
            border-bottom-color: rgba(42, 52, 66, 0.7);
        }
        .site-header--dark .site-logo {
            color: var(--color-text-on-dark);
        }
        .site-header--dark .main-nav__link {
            color: var(--color-text-dim-on-dark);
        }
        .site-header--dark .main-nav__link:hover,
        .site-header--dark .main-nav__link:focus {
            color: var(--color-accent);
        }
        .site-header--dark .main-nav__link--active {
            color: var(--color-accent);
        }
        .site-header--dark .search-btn {
            color: var(--color-text-dim-on-dark);
        }
        .site-header--dark .search-btn:hover {
            color: var(--color-accent);
        }
        .site-header__inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 16px;
        }
        .site-header__left {
            display: flex;
            align-items: center;
            gap: 32px;
            flex: 1;
            min-width: 0;
        }
        .site-header__right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }
        .site-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--color-text-dark);
            white-space: nowrap;
            line-height: 1;
        }
        .site-logo__icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--color-accent);
            color: #0B0F14;
            font-size: 14px;
            flex-shrink: 0;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .main-nav__item {
            position: relative;
        }
        .main-nav__link {
            display: inline-block;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-mid);
            border-radius: var(--radius);
            position: relative;
            transition: color var(--transition-fast), background var(--transition-fast);
        }
        .main-nav__link::after {
            content: '';
            position: absolute;
            left: 12px;
            right: 12px;
            bottom: 0px;
            height: 2px;
            background: var(--color-accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform var(--transition-med);
            border-radius: 1px;
        }
        .main-nav__link:hover::after,
        .main-nav__link:focus::after {
            transform: scaleX(1);
        }
        .main-nav__link:hover,
        .main-nav__link:focus {
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.06);
        }
        .main-nav__link--active {
            color: var(--color-accent);
            font-weight: 700;
        }
        .main-nav__link--active::after {
            transform: scaleX(1);
        }
        .search-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            font-size: 16px;
            color: var(--color-text-mid);
            transition: all var(--transition-fast);
        }
        .search-btn:hover,
        .search-btn:focus {
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.08);
            transform: rotate(12deg);
        }
        .site-header .btn--header-cta {
            padding: 10px 18px;
            font-size: 13px;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 4px;
            width: 36px;
            height: 36px;
            border-radius: var(--radius);
            background: transparent;
            border: 1px solid var(--color-border-dark);
            align-items: center;
            flex-shrink: 0;
            transition: border-color var(--transition-fast);
        }
        .nav-toggle:hover,
        .nav-toggle:focus {
            border-color: var(--color-accent);
        }
        .nav-toggle__bar {
            display: block;
            width: 16px;
            height: 2px;
            background: var(--color-text-dark);
            border-radius: 1px;
            transition: all var(--transition-fast);
        }
        .site-header--dark .nav-toggle__bar {
            background: var(--color-text-on-dark);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--color-bg-dark);
            z-index: 999;
            padding: 24px 16px 40px;
            overflow-y: auto;
            flex-direction: column;
        }
        .mobile-menu.is-open {
            display: flex;
        }
        .mobile-menu__links {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-menu__link {
            display: block;
            padding: 14px 16px;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-text-on-dark);
            border-radius: var(--radius);
            transition: all var(--transition-fast);
            border: 1px solid transparent;
        }
        .mobile-menu__link:hover,
        .mobile-menu__link:focus {
            background: rgba(0, 217, 165, 0.08);
            color: var(--color-accent);
            border-color: rgba(0, 217, 165, 0.25);
        }
        .mobile-menu__link--active {
            color: var(--color-accent);
            border-color: rgba(0, 217, 165, 0.3);
            background: rgba(0, 217, 165, 0.06);
        }
        .mobile-menu__footer {
            margin-top: auto;
            padding-top: 24px;
            border-top: 1px solid var(--color-border-dark);
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 13px;
            margin-bottom: 20px;
            color: var(--color-text-dim-on-dark);
        }
        .breadcrumb__sep {
            color: var(--color-accent);
            font-size: 11px;
        }
        .breadcrumb a {
            color: var(--color-text-dim-on-dark);
        }
        .breadcrumb a:hover,
        .breadcrumb a:focus {
            color: var(--color-accent);
        }
        .breadcrumb__current {
            color: var(--color-accent);
            font-weight: 600;
        }
        .category-hero {
            padding: calc(var(--header-height) + 56px) 0 64px;
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
            position: relative;
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 60%;
            height: 160%;
            background: radial-gradient(ellipse at center, rgba(0, 217, 165, 0.08), transparent 65%);
            pointer-events: none;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -5%;
            width: 40%;
            height: 120%;
            background: radial-gradient(ellipse at center, rgba(255, 92, 53, 0.05), transparent 60%);
            pointer-events: none;
        }
        .category-hero__content {
            position: relative;
            z-index: 2;
            max-width: 780px;
        }
        .category-hero__title {
            font-size: clamp(34px, 5vw, 56px);
            font-weight: 900;
            letter-spacing: -0.02em;
            line-height: 1.1;
            margin-bottom: 16px;
            color: var(--color-text-on-dark);
        }
        .category-hero__desc {
            font-size: 16px;
            line-height: 1.8;
            color: var(--color-text-dim-on-dark);
            max-width: 640px;
        }
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }
        .filter-bar__label {
            font-size: 13px;
            font-weight: 700;
            color: var(--color-text-mid);
            letter-spacing: 0.04em;
            margin-right: 4px;
        }
        .news-card {
            display: grid;
            grid-template-columns: 200px 1fr;
            gap: 20px;
            background: #FFFFFF;
            border: 1px solid #E2E6EA;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: #C4CDD5;
        }
        .news-card__thumb {
            position: relative;
            overflow: hidden;
            background: #DCE2E8;
            min-height: 150px;
        }
        .news-card__thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }
        .news-card:hover .news-card__thumb img {
            transform: scale(1.03);
        }
        .news-card__tag {
            position: absolute;
            top: 12px;
            left: 12px;
        }
        .news-card__body {
            padding: 20px 20px 20px 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .news-card__meta {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 12px;
            color: var(--color-text-light);
            letter-spacing: 0.02em;
        }
        .news-card__title {
            font-size: 18px;
            font-weight: 800;
            line-height: 1.35;
            letter-spacing: -0.01em;
            margin: 0;
        }
        .news-card__title a {
            color: var(--color-text-dark);
        }
        .news-card__title a:hover,
        .news-card__title a:focus {
            color: #00c291;
        }
        .news-card__excerpt {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-mid);
            margin: 0;
            flex: 1;
        }
        .news-card__link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-text-mid);
            transition: all var(--transition-fast);
            align-self: flex-start;
        }
        .news-card__link i {
            font-size: 11px;
            transition: transform var(--transition-fast);
        }
        .news-card__link:hover,
        .news-card__link:focus {
            color: #00c291;
        }
        .news-card__link:hover i,
        .news-card__link:focus i {
            transform: translateX(3px);
        }
        .hotspot-card {
            background: var(--color-card-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            box-shadow: var(--shadow-dark-card);
            transition: transform var(--transition-med), border-color var(--transition-med), box-shadow var(--transition-med);
            height: 100%;
            color: var(--color-text-on-dark);
        }
        .hotspot-card:hover {
            transform: translateY(-4px);
            border-color: var(--color-accent);
            box-shadow: 0 20px 44px -24px rgba(0, 0, 0, 0.8);
        }
        .hotspot-card__top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
        }
        .hotspot-card__rank {
            font-family: var(--font-mono);
            font-size: 28px;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1;
        }
        .hotspot-card__title {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--color-text-on-dark);
            margin: 0;
        }
        .hotspot-card__excerpt {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-dim-on-dark);
            margin: 0;
        }
        .metric-bar {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .metric-item {
            text-align: center;
            padding: 24px 16px;
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            background: rgba(27, 35, 46, 0.6);
            transition: border-color var(--transition-fast);
        }
        .metric-item:hover {
            border-color: var(--color-accent);
        }
        .metric-item__value {
            font-family: var(--font-mono);
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--color-accent);
            line-height: 1.1;
            margin-bottom: 8px;
        }
        .metric-item__label {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-dim-on-dark);
            letter-spacing: 0.04em;
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }
        .tag-cloud .tag-pill {
            font-size: 14px;
            padding: 10px 20px;
            background: #FFFFFF;
            border-color: #D8DEE5;
            color: var(--color-text-mid);
            cursor: default;
            transition: all var(--transition-fast);
        }
        .tag-cloud .tag-pill:hover {
            border-color: var(--color-accent);
            color: #00c291;
            background: rgba(0, 217, 165, 0.05);
        }
        .accordion-qa {
            border: 1px solid #D8DEE5;
            border-radius: var(--radius);
            overflow: hidden;
            background: #FFFFFF;
        }
        .accordion-qa__item {
            border-bottom: 1px solid #E2E6EA;
        }
        .accordion-qa__item:last-child {
            border-bottom: none;
        }
        .accordion-qa__title {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            font-size: 15px;
            font-weight: 700;
            color: var(--color-text-dark);
            text-align: left;
            background: transparent;
            transition: background var(--transition-fast);
            line-height: 1.5;
        }
        .accordion-qa__title:hover {
            background: rgba(0, 217, 165, 0.04);
        }
        .accordion-qa__title i {
            font-size: 14px;
            color: var(--color-text-light);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
        }
        .accordion-qa__title[aria-expanded="true"] i {
            transform: rotate(180deg);
            color: var(--color-accent);
        }
        .accordion-qa__content {
            padding: 0 20px 20px;
            font-size: 14px;
            line-height: 1.75;
            color: var(--color-text-mid);
            display: none;
        }
        .accordion-qa__content.is-active {
            display: block;
        }
        .cta-band {
            background: var(--color-bg-dark);
            border-radius: var(--radius);
            padding: 48px 40px;
            display: grid;
            grid-template-columns: 1fr auto;
            gap: 32px;
            align-items: center;
            border: 1px solid var(--color-border-dark);
        }
        .cta-band__title {
            font-size: clamp(22px, 3vw, 32px);
            font-weight: 800;
            color: var(--color-text-on-dark);
            letter-spacing: -0.01em;
            margin-bottom: 8px;
        }
        .cta-band__desc {
            font-size: 15px;
            color: var(--color-text-dim-on-dark);
            margin: 0;
        }
        .cta-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            align-items: center;
        }
        .cta-form__input {
            flex: 1;
            min-width: 220px;
            padding: 13px 16px;
            font-size: 14px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            color: var(--color-text-on-dark);
            transition: border-color var(--transition-fast), background var(--transition-fast);
        }
        .cta-form__input::placeholder {
            color: var(--color-text-dim-on-dark);
        }
        .cta-form__input:focus {
            border-color: var(--color-accent);
            background: rgba(0, 217, 165, 0.06);
            outline: none;
        }
        .site-footer {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
            padding: 56px 0 24px;
            border-top: 1px solid var(--color-border-dark);
        }
        .site-footer .site-logo {
            color: var(--color-text-on-dark);
        }
        .footer__grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 40px;
        }
        .footer__brand-text {
            font-size: 14px;
            line-height: 1.8;
            color: var(--color-text-dim-on-dark);
            margin-top: 12px;
            max-width: 320px;
        }
        .footer__col h4 {
            font-size: 14px;
            font-weight: 700;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            color: var(--color-text-on-dark);
            margin-bottom: 16px;
        }
        .footer__links {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer__links a {
            font-size: 14px;
            color: var(--color-text-dim-on-dark);
            transition: color var(--transition-fast);
        }
        .footer__links a:hover,
        .footer__links a:focus {
            color: var(--color-accent);
        }
        .footer__bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            padding-top: 20px;
            border-top: 1px solid var(--color-border-dark);
            font-size: 13px;
            color: var(--color-text-dim-on-dark);
        }
        .footer__legal {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer__legal a {
            color: var(--color-text-dim-on-dark);
        }
        .footer__legal a:hover,
        .footer__legal a:focus {
            color: var(--color-accent);
        }
        @media (max-width: 1024px) {
            .main-nav__link {
                padding: 8px 8px;
                font-size: 13px;
            }
            .site-header__left {
                gap: 16px;
            }
            .news-card {
                grid-template-columns: 160px 1fr;
                gap: 16px;
            }
            .news-card__body {
                padding: 16px 16px 16px 0;
            }
            .cta-band {
                grid-template-columns: 1fr;
                padding: 32px 24px;
            }
            .footer__grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 640px) {
            :root {
                --section-pad-desktop: 56px;
                --section-pad-mobile: 48px;
                --header-height: 60px;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section {
                padding: var(--section-pad-mobile) 0;
            }
            .section__title {
                font-size: 26px;
            }
            .section__desc {
                font-size: 15px;
            }
            .main-nav {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .site-header__right .search-btn {
                display: none;
            }
            .site-header__right .btn--header-cta {
                display: none;
            }
            .category-hero {
                padding: calc(var(--header-height) + 32px) 0 40px;
            }
            .category-hero__title {
                font-size: 30px;
            }
            .category-hero__desc {
                font-size: 15px;
            }
            .filter-bar {
                gap: 8px;
            }
            .tag-pill {
                padding: 6px 12px;
                font-size: 12px;
            }
            .news-card {
                grid-template-columns: 1fr;
                gap: 0;
            }
            .news-card__thumb {
                min-height: 180px;
            }
            .news-card__body {
                padding: 16px;
            }
            .news-card__title {
                font-size: 16px;
            }
            .hotspot-card {
                padding: 20px;
            }
            .metric-bar {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .metric-item {
                padding: 20px 16px;
            }
            .metric-item__value {
                font-size: 28px;
            }
            .cta-band {
                padding: 28px 20px;
            }
            .cta-form__input {
                min-width: 100%;
            }
            .footer__grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer__bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .btn {
                padding: 12px 20px;
                font-size: 14px;
            }
        }

.site-header.is-scrolled {
            box-shadow: 0 8px 24px -12px rgba(0, 0, 0, 0.25);
        }
        @media (max-width: 640px) {
            .mobile-menu {
                display: flex;
                opacity: 0;
                pointer-events: none;
                transform: translateY(-12px);
                transition: opacity 0.24s ease, transform 0.24s ease;
            }
            .mobile-menu.is-open {
                opacity: 1;
                pointer-events: auto;
                transform: translateY(0);
            }
            body.menu-open {
                overflow: hidden;
            }
        }
        @media (min-width: 641px) {
            .mobile-menu {
                display: none !important;
            }
        }

/* roulang page: category4 */
:root {
      --color-bg-dark: #0B0F14;
      --color-bg-paper: #F4F6F8;
      --color-accent: #00D9A5;
      --color-warning: #FF5C35;
      --color-card-dark: #1B232E;
      --color-border-dark: #2A3442;
      --color-positive: #2EE6A8;
      --color-negative: #FF4D4D;
      --color-text-dark: #0B0F14;
      --color-text-mid: #5A6572;
      --color-text-light: #9BA6B2;
      --color-text-on-dark: #E8EDF2;
      --color-text-dim-on-dark: #8B97A4;
      --font-sans: "Inter", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
      --radius: 4px;
      --radius-pill: 999px;
      --shadow-card: 0 2px 8px -2px rgba(0, 0, 0, 0.12);
      --shadow-card-hover: 0 18px 40px -24px rgba(0, 0, 0, 0.65);
      --shadow-dark-card: 0 4px 14px -4px rgba(0, 0, 0, 0.45);
      --transition-fast: 0.18s ease;
      --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
      --section-pad-desktop: 96px;
      --section-pad-mobile: 56px;
      --gap-section: 56px;
      --header-height: 68px;
    }

    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    body {
      font-family: var(--font-sans);
      font-size: 15px;
      line-height: 1.8;
      color: var(--color-text-dark);
      background-color: var(--color-bg-paper);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    a {
      color: var(--color-accent);
      text-decoration: none;
      transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
    }

    a:hover,
    a:focus {
      color: #00c291;
    }

    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
      outline: 2px solid var(--color-accent);
      outline-offset: 3px;
      border-radius: 2px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button,
    input,
    select,
    textarea {
      font-family: inherit;
      font-size: inherit;
      line-height: inherit;
    }

    button {
      cursor: pointer;
      border: none;
      background: none;
      padding: 0;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 640px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    .section {
      padding: var(--section-pad-desktop) 0;
    }

    @media (max-width: 640px) {
      .section {
        padding: var(--section-pad-mobile) 0;
      }
    }

    .section--dark {
      background: var(--color-bg-dark);
      color: var(--color-text-on-dark);
    }

    .section--dark h1,
    .section--dark h2,
    .section--dark h3,
    .section--dark h4 {
      color: var(--color-text-on-dark);
    }

    .section--dark p {
      color: var(--color-text-dim-on-dark);
    }

    .section--dark .text-mid {
      color: var(--color-text-dim-on-dark);
    }

    .section--paper {
      background: var(--color-bg-paper);
    }

    .section--carbon {
      background: #121820;
      color: var(--color-text-on-dark);
    }

    .section--carbon h2,
    .section--carbon h3,
    .section--carbon h4 {
      color: var(--color-text-on-dark);
    }

    .section--carbon p {
      color: var(--color-text-dim-on-dark);
    }

    .section--accent-tint {
      background: #EAFCF7;
    }

    .section--grid-pattern {
      background-image:
        linear-gradient(rgba(15, 32, 28, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(15, 32, 28, 0.04) 1px, transparent 1px);
      background-size: 32px 32px;
    }

    .section__header {
      margin-bottom: 40px;
      max-width: 720px;
    }

    .section__header--center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .section__eyebrow {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--color-accent);
      margin-bottom: 12px;
    }

    .section__eyebrow--dark {
      color: var(--color-accent);
    }

    .section__title {
      font-size: clamp(26px, 3.8vw, 42px);
      font-weight: 800;
      letter-spacing: -0.015em;
      line-height: 1.2;
      margin-bottom: 16px;
    }

    .section__desc {
      font-size: 16px;
      line-height: 1.75;
      color: var(--color-text-mid);
      max-width: 620px;
    }

    .section__desc--center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .section--dark .section__desc,
    .section--dark .section__desc p {
      color: var(--color-text-dim-on-dark);
    }

    .grid {
      display: grid;
      gap: 24px;
    }

    .grid-2 {
      grid-template-columns: repeat(2, 1fr);
    }

    .grid-3 {
      grid-template-columns: repeat(3, 1fr);
    }

    .grid-4 {
      grid-template-columns: repeat(4, 1fr);
    }

    @media (max-width: 1024px) {
      .grid-3,
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .grid-2,
      .grid-3,
      .grid-4 {
        grid-template-columns: 1fr;
      }
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(11, 15, 20, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--color-border-dark);
      height: var(--header-height);
      display: flex;
      align-items: center;
    }

    .site-header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .site-logo {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 18px;
      font-weight: 800;
      color: var(--color-text-on-dark);
      letter-spacing: -0.01em;
      white-space: nowrap;
    }

    .site-logo:hover,
    .site-logo:focus {
      color: #fff;
    }

    .site-logo__icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      background: var(--color-accent);
      color: var(--color-bg-dark);
      border-radius: var(--radius);
      font-size: 15px;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 4px;
      list-style: none;
      margin: 0;
      padding: 0;
      flex-wrap: wrap;
    }

    .main-nav__link {
      display: inline-block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      color: var(--color-text-dim-on-dark);
      position: relative;
      transition: color var(--transition-fast);
      white-space: nowrap;
    }

    .main-nav__link::after {
      content: "";
      position: absolute;
      left: 12px;
      right: 12px;
      bottom: 4px;
      height: 2px;
      background: var(--color-accent);
      transform: scaleX(0);
      transform-origin: left;
      transition: transform var(--transition-med);
    }

    .main-nav__link:hover,
    .main-nav__link:focus,
    .main-nav__link--active {
      color: #fff;
    }

    .main-nav__link:hover::after,
    .main-nav__link:focus::after,
    .main-nav__link--active::after {
      transform: scaleX(1);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .header-search {
      width: 36px;
      height: 36px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius);
      color: var(--color-text-dim-on-dark);
      transition: transform var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
    }

    .header-search:hover,
    .header-search:focus {
      color: var(--color-accent);
      background: rgba(255, 255, 255, 0.06);
      transform: rotate(6deg);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius);
      font-weight: 700;
      font-size: 14px;
      line-height: 1;
      padding: 12px 20px;
      transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
      white-space: nowrap;
    }

    .btn--accent {
      background: var(--color-accent);
      color: var(--color-bg-dark);
    }

    .btn--accent:hover,
    .btn--accent:focus {
      background: #00c291;
      color: var(--color-bg-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px -12px rgba(0, 217, 165, 0.6);
    }

    .btn--outline-dark {
      border: 1px solid var(--color-border-dark);
      color: var(--color-text-on-dark);
      background: transparent;
    }

    .btn--outline-dark:hover,
    .btn--outline-dark:focus {
      border-color: var(--color-accent);
      color: var(--color-accent);
    }

    .btn--ghost {
      background: transparent;
      color: var(--color-accent);
      padding-left: 4px;
      padding-right: 4px;
      position: relative;
    }

    .btn--ghost::after {
      content: "";
      position: absolute;
      left: 4px;
      right: 4px;
      bottom: 6px;
      height: 2px;
      background: currentColor;
      transform: scaleX(0.5);
      transform-origin: left;
      transition: transform var(--transition-med);
    }

    .btn--ghost:hover::after,
    .btn--ghost:focus::after {
      transform: scaleX(1);
    }

    .menu-toggle {
      display: none;
      width: 40px;
      height: 40px;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius);
      color: var(--color-text-on-dark);
      border: 1px solid var(--color-border-dark);
      transition: border-color var(--transition-fast), color var(--transition-fast);
    }

    .menu-toggle:hover,
    .menu-toggle:focus {
      border-color: var(--color-accent);
      color: var(--color-accent);
    }

    @media (max-width: 1024px) {
      .main-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(11, 15, 20, 0.98);
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 24px 24px;
        border-bottom: 1px solid var(--color-border-dark);
      }

      .main-nav.is-open {
        display: flex;
      }

      .main-nav__item {
        width: 100%;
      }

      .main-nav__link {
        display: block;
        padding: 10px 0;
      }

      .main-nav__link::after {
        left: 0;
        right: auto;
        width: 100%;
      }

      .menu-toggle {
        display: inline-flex;
      }

      .header-actions .btn--outline-dark {
        display: none;
      }
    }

    @media (max-width: 640px) {
      .header-search {
        display: none;
      }
    }

    /* Hero Section */
    .hero {
      background: var(--color-bg-dark);
      color: var(--color-text-on-dark);
      padding: 48px 0 72px;
    }

    .hero__inner {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }

    @media (max-width: 1024px) {
      .hero__inner {
        grid-template-columns: 1fr;
      }
    }

    .hero__eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--color-accent);
      margin-bottom: 16px;
    }

    .hero__title {
      font-size: clamp(36px, 5.2vw, 60px);
      font-weight: 900;
      letter-spacing: -0.025em;
      line-height: 1.05;
      margin-bottom: 20px;
      color: #fff;
    }

    .hero__desc {
      font-size: 17px;
      line-height: 1.85;
      color: var(--color-text-dim-on-dark);
      max-width: 560px;
      margin-bottom: 28px;
    }

    .hero__actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }

    .hero__check-list {
      list-style: none;
      padding: 0;
      margin: 0 0 28px;
      display: grid;
      gap: 12px;
    }

    .hero__check-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 15px;
      color: var(--color-text-on-dark);
    }

    .hero__check-list i {
      color: var(--color-positive);
      font-size: 16px;
    }

    .hero__visual {
      position: relative;
      min-height: 280px;
      border-radius: var(--radius);
      overflow: hidden;
      background: var(--color-card-dark);
      border: 1px solid var(--color-border-dark);
      aspect-ratio: 4 / 3;
    }

    .hero__visual img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      filter: saturate(1.05);
    }

    .hero__visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(0,0,0,0) 45%, rgba(0,0,0,0.55));
      pointer-events: none;
    }

    .hero__badge {
      position: absolute;
      left: 16px;
      bottom: 16px;
      z-index: 2;
      background: rgba(11, 15, 20, 0.8);
      border: 1px solid var(--color-border-dark);
      border-radius: var(--radius);
      padding: 8px 12px;
      font-size: 13px;
      color: var(--color-text-on-dark);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .hero__badge i {
      color: var(--color-accent);
    }

    /* Breadcrumb */
    .breadcrumb {
      background: var(--color-bg-paper);
      border-bottom: 1px solid #E4E8EC;
      padding: 12px 0;
    }

    .breadcrumb ul {
      list-style: none;
      padding: 0;
      margin: 0;
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      font-size: 13px;
      color: var(--color-text-mid);
    }

    .breadcrumb li {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .breadcrumb li + li::before {
      content: "/";
      color: #B8C0C8;
      margin-right: 8px;
    }

    .breadcrumb a {
      color: var(--color-text-mid);
    }

    .breadcrumb a:hover,
    .breadcrumb a:focus {
      color: var(--color-accent);
    }

    .breadcrumb li:last-child {
      color: var(--color-text-dark);
      font-weight: 600;
    }

    /* Category intro */
    .cat-intro {
      background: var(--color-bg-paper);
      border-bottom: 1px solid #E4E8EC;
      padding: 32px 0;
    }

    .cat-intro__title {
      font-size: clamp(28px, 4vw, 44px);
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 12px;
    }

    .cat-intro__desc {
      font-size: 15px;
      line-height: 1.8;
      color: var(--color-text-mid);
      max-width: 760px;
    }

    /* Filter pills */
    .filter-bar {
      padding: 24px 0;
      background: var(--color-bg-paper);
      border-bottom: 1px solid #E4E8EC;
    }

    .filter-bar__label {
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      color: var(--color-text-mid);
      margin-right: 12px;
      white-space: nowrap;
    }

    .filter-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      align-items: center;
    }

    .filter-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 16px;
      border-radius: var(--radius-pill);
      border: 1px solid #D5DCE2;
      background: #fff;
      font-size: 13px;
      font-weight: 600;
      color: var(--color-text-mid);
      transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
    }

    .filter-pill:hover,
    .filter-pill:focus {
      border-color: var(--color-accent);
      color: var(--color-accent);
    }

    .filter-pill--active {
      background: var(--color-accent);
      border-color: var(--color-accent);
      color: var(--color-bg-dark);
    }

    /* List cards */
    .list-stage {
      padding: 32px 0 64px;
    }

    .list-cards {
      display: grid;
      gap: 20px;
    }

    .list-card {
      display: grid;
      grid-template-columns: 220px 1fr;
      background: #fff;
      border: 1px solid #E4E8EC;
      border-radius: var(--radius);
      overflow: hidden;
      transition: box-shadow var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
    }

    @media (max-width: 640px) {
      .list-card {
        grid-template-columns: 1fr;
      }
    }

    .list-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-color: #CBD4DB;
    }

    .list-card__thumb {
      width: 100%;
      height: 100%;
      aspect-ratio: 16 / 10;
      overflow: hidden;
      background: var(--color-card-dark);
    }

    @media (max-width: 640px) {
      .list-card__thumb {
        aspect-ratio: 16 / 9;
      }
    }

    .list-card__thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform var(--transition-med);
    }

    .list-card:hover .list-card__thumb img {
      transform: scale(1.03);
    }

    .list-card__body {
      padding: 22px 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 14px;
    }

    .list-card__meta {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 10px;
      font-size: 13px;
      color: var(--color-text-light);
    }

    .list-card__tag {
      display: inline-flex;
      align-items: center;
      padding: 4px 10px;
      border-radius: var(--radius-pill);
      background: #F0F3F5;
      font-weight: 700;
      font-size: 12px;
      color: var(--color-text-mid);
      letter-spacing: 0.02em;
    }

    .list-card__tag--hot {
      background: #FFEFEB;
      color: var(--color-warning);
    }

    .list-card__tag--new {
      background: #EAFCF7;
      color: #009b76;
    }

    .list-card__title {
      font-size: 20px;
      font-weight: 750;
      line-height: 1.35;
      color: var(--color-text-dark);
      letter-spacing: -0.01em;
      margin-bottom: 4px;
    }

    .list-card__title a {
      color: inherit;
    }

    .list-card__title a:hover,
    .list-card__title a:focus {
      color: var(--color-accent);
    }

    .list-card__excerpt {
      font-size: 14px;
      line-height: 1.7;
      color: var(--color-text-mid);
      margin: 0;
    }

    .list-card__link {
      align-self: flex-start;
      font-size: 13px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--color-accent);
    }

    .list-card__link i {
      transition: transform var(--transition-fast);
    }

    .list-card__link:hover i,
    .list-card__link:focus i {
      transform: translateX(4px);
    }

    /* Hot pins */
    .hot-pinned {
      padding: 24px 0 48px;
    }

    .hot-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    @media (max-width: 1024px) {
      .hot-cards {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .hot-cards {
        grid-template-columns: 1fr;
      }
    }

    .hot-card {
      background: #fff;
      border: 1px solid #E4E8EC;
      border-radius: var(--radius);
      padding: 20px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      transition: box-shadow var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
    }

    .hot-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-color: #CBD4DB;
    }

    .hot-card__rank {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 900;
      color: var(--color-accent);
      font-family: var(--font-mono);
    }

    .hot-card__badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      padding: 4px 10px;
      border-radius: var(--radius-pill);
      background: var(--color-warning);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      margin-left: 8px;
    }

    .hot-card__title {
      font-size: 17px;
      font-weight: 750;
      line-height: 1.4;
      color: var(--color-text-dark);
    }

    .hot-card__text {
      font-size: 14px;
      color: var(--color-text-mid);
      line-height: 1.7;
      margin: 0;
    }

    .hot-card__link {
      align-self: flex-start;
      font-size: 13px;
      font-weight: 700;
      color: var(--color-accent);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .hot-card__link i {
      transition: transform var(--transition-fast);
    }

    .hot-card__link:hover i,
    .hot-card__link:focus i {
      transform: translateX(4px);
    }

    /* Team stats strip */
    .team-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 32px;
    }

    @media (max-width: 640px) {
      .team-stats {
        grid-template-columns: 1fr;
      }
    }

    .team-stat {
      background: var(--color-card-dark);
      border: 1px solid var(--color-border-dark);
      border-radius: var(--radius);
      padding: 24px;
      color: var(--color-text-on-dark);
      transition: border-color var(--transition-fast), transform var(--transition-fast);
    }

    .team-stat:hover {
      border-color: var(--color-accent);
      transform: translateY(-3px);
    }

    .team-stat__label {
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--color-text-dim-on-dark);
      margin-bottom: 12px;
    }

    .team-stat__value {
      font-size: 32px;
      font-weight: 900;
      letter-spacing: -0.02em;
      color: var(--color-accent);
      font-family: var(--font-mono);
      line-height: 1;
      margin-bottom: 8px;
    }

    .team-stat__text {
      font-size: 14px;
      color: var(--color-text-dim-on-dark);
      margin: 0;
    }

    /* Tag cloud */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }

    .tag-cloud__item {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      border-radius: var(--radius-pill);
      border: 1px solid #D5DCE2;
      background: #fff;
      font-size: 13px;
      font-weight: 600;
      color: var(--color-text-mid);
      transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
    }

    .tag-cloud__item:hover,
    .tag-cloud__item:focus {
      border-color: var(--color-accent);
      color: var(--color-accent);
    }

    /* FAQ */
    .faq-list {
      max-width: 780px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid #E4E8EC;
      border-radius: var(--radius);
      background: #fff;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 20px 22px;
      font-size: 16px;
      font-weight: 700;
      color: var(--color-text-dark);
      text-align: left;
    }

    .faq-question i {
      transition: transform var(--transition-fast);
      color: var(--color-text-light);
    }

    .faq-item.is-open .faq-question i {
      transform: rotate(180deg);
      color: var(--color-accent);
    }

    .faq-answer {
      display: none;
      padding: 0 22px 20px;
      font-size: 14px;
      line-height: 1.75;
      color: var(--color-text-mid);
    }

    .faq-item.is-open .faq-answer {
      display: block;
    }

    .faq-item:hover {
      border-color: #CBD4DB;
    }

    /* CTA / subscribe */
    .cta-subscribe {
      background: var(--color-bg-dark);
      color: var(--color-text-on-dark);
      border-radius: var(--radius);
      padding: 48px;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 32px;
      align-items: center;
    }

    @media (max-width: 1024px) {
      .cta-subscribe {
        grid-template-columns: 1fr;
        padding: 32px 24px;
      }
    }

    .cta-subscribe__title {
      font-size: clamp(24px, 3vw, 36px);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 12px;
      color: #fff;
    }

    .cta-subscribe__desc {
      font-size: 15px;
      color: var(--color-text-dim-on-dark);
      margin: 0 0 20px;
    }

    .subscribe-form {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .subscribe-form input {
      flex: 1 1 220px;
      background: var(--color-card-dark);
      border: 1px solid var(--color-border-dark);
      border-radius: var(--radius);
      padding: 12px 14px;
      color: var(--color-text-on-dark);
      font-size: 14px;
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    }

    .subscribe-form input::placeholder {
      color: #667281;
    }

    .subscribe-form input:focus {
      outline: none;
      border-color: var(--color-accent);
      box-shadow: 0 0 0 3px rgba(0, 217, 165, 0.12);
    }

    .subscribe-form button {
      flex: 0 0 auto;
    }

    /* Footer */
    .site-footer {
      background: #0A0E13;
      color: var(--color-text-dim-on-dark);
      padding: 56px 0 24px;
      border-top: 1px solid var(--color-border-dark);
    }

    .footer__grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }

    @media (max-width: 1024px) {
      .footer__grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 640px) {
      .footer__grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }

    .footer__brand-text {
      font-size: 14px;
      line-height: 1.75;
      margin-top: 12px;
      color: var(--color-text-dim-on-dark);
      max-width: 300px;
    }

    .footer__col h4 {
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--color-text-on-dark);
      margin-bottom: 16px;
    }

    .footer__links {
      list-style: none;
      padding: 0;
      margin: 0;
      display: grid;
      gap: 10px;
      font-size: 14px;
    }

    .footer__links a {
      color: var(--color-text-dim-on-dark);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: color var(--transition-fast);
    }

    .footer__links a:hover,
    .footer__links a:focus {
      color: var(--color-accent);
    }

    .footer__bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      border-top: 1px solid var(--color-border-dark);
      padding-top: 24px;
      font-size: 13px;
    }

    .footer__legal {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .footer__legal a {
      color: var(--color-text-dim-on-dark);
    }

    .footer__legal a:hover,
    .footer__legal a:focus {
      color: var(--color-accent);
    }

    @media (max-width: 640px) {
      .footer__bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    /* Utility */
    .text-accent {
      color: var(--color-accent);
    }

    .text-warning {
      color: var(--color-warning);
    }

    .mt-8 {
      margin-top: 8px;
    }

    .mt-16 {
      margin-top: 16px;
    }

    .mt-24 {
      margin-top: 24px;
    }

    .mb-16 {
      margin-bottom: 16px;
    }

/* roulang page: category5 */
:root {
            --color-bg-dark: #0B0F14;
            --color-bg-paper: #F4F6F8;
            --color-accent: #00D9A5;
            --color-warning: #FF5C35;
            --color-card-dark: #1B232E;
            --color-border-dark: #2A3442;
            --color-positive: #2EE6A8;
            --color-negative: #FF4D4D;
            --color-text-dark: #0B0F14;
            --color-text-mid: #5A6572;
            --color-text-light: #9BA6B2;
            --color-text-on-dark: #E8EDF2;
            --color-text-dim-on-dark: #8B97A4;
            --font-sans: "Inter", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
            --radius: 4px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 8px -2px rgba(0, 0, 0, 0.12);
            --shadow-card-hover: 0 18px 40px -24px rgba(0, 0, 0, 0.65);
            --shadow-dark-card: 0 4px 14px -4px rgba(0, 0, 0, 0.45);
            --transition-fast: 0.18s ease;
            --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --section-pad-desktop: 96px;
            --section-pad-mobile: 56px;
            --gap-section: 56px;
            --header-height: 68px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text-dark);
            background-color: var(--color-bg-paper);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
        }

        a:hover,
        a:focus {
            color: #00c291;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 2px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
            padding: 0;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        @media (max-width: 640px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        .section {
            padding: var(--section-pad-desktop) 0;
        }

        @media (max-width: 640px) {
            .section {
                padding: var(--section-pad-mobile) 0;
            }
        }

        .section--dark {
            background: var(--color-bg-dark);
            color: var(--color-text-on-dark);
        }

        .section--dark h1,
        .section--dark h2,
        .section--dark h3,
        .section--dark h4 {
            color: var(--color-text-on-dark);
        }

        .section--dark p {
            color: var(--color-text-dim-on-dark);
        }

        .section--paper {
            background: var(--color-bg-paper);
        }

        .section--carbon {
            background: #121820;
            color: var(--color-text-on-dark);
        }

        .section--carbon h2,
        .section--carbon h3,
        .section--carbon h4 {
            color: var(--color-text-on-dark);
        }

        .section--carbon p {
            color: var(--color-text-dim-on-dark);
        }

        .section--accent-tint {
            background: #EAFCF7;
        }

        .section--grid-pattern {
            background-image:
                linear-gradient(rgba(15, 32, 28, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(15, 32, 28, 0.04) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        .section__header {
            margin-bottom: 40px;
            max-width: 720px;
        }

        .section__header--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section__eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 12px;
        }

        .section__eyebrow--dark {
            color: var(--color-accent);
        }

        .section__title {
            font-size: clamp(26px, 3.8vw, 42px);
            font-weight: 800;
            letter-spacing: -0.015em;
            line-height: 1.2;
            margin-bottom: 16px;
        }

        .section__desc {
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text-mid);
            max-width: 620px;
        }

        .section__desc--center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section--dark .section__desc,
        .section--dark .section__desc p {
            color: var(--color-text-dim-on-dark);
        }

        .grid {
            display: grid;
            gap: 24px;
        }

        .grid-2 {
            grid-template-columns: repeat(2, 1fr);
        }

        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
        }

        .grid-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
        }

        /* Header */
        .site-header {
            background: var(--color-bg-paper);
            border-bottom: 1px solid rgba(11, 15, 20, 0.08);
            position: sticky;
            top: 0;
            z-index: 50;
            height: var(--header-height);
            display: flex;
            align-items: center;
        }

        .header__inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            width: 100%;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--color-text-dark);
            font-weight: 800;
            font-size: 20px;
            letter-spacing: -0.01em;
            white-space: nowrap;
        }

        .site-logo:hover,
        .site-logo:focus {
            color: var(--color-text-dark);
        }

        .site-logo__icon {
            width: 34px;
            height: 34px;
            border-radius: var(--radius);
            background: var(--color-accent);
            color: var(--color-bg-dark);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
        }

        .main-nav__item {
            margin: 0;
        }

        .main-nav__link {
            display: inline-block;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-mid);
            border-radius: var(--radius);
            transition: color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
            position: relative;
        }

        .main-nav__link::after {
            content: '';
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 4px;
            height: 2px;
            background: var(--color-accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform var(--transition-med);
        }

        .main-nav__link:hover,
        .main-nav__link:focus {
            color: var(--color-text-dark);
            background: rgba(0, 217, 165, 0.06);
        }

        .main-nav__link:hover::after,
        .main-nav__link:focus::after {
            transform: scaleX(1);
        }

        .main-nav__link--active {
            color: var(--color-text-dark);
            font-weight: 700;
        }

        .main-nav__link--active::after {
            transform: scaleX(1);
        }

        .header__actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .search-btn {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--color-text-mid);
            background: transparent;
            border: 1px solid rgba(11, 15, 20, 0.12);
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
        }

        .search-btn:hover,
        .search-btn:focus {
            color: var(--color-accent);
            border-color: var(--color-accent);
            background: rgba(0, 217, 165, 0.06);
            transform: rotate(8deg);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 700;
            border-radius: var(--radius);
            border: 1px solid transparent;
            transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
            cursor: pointer;
            text-align: center;
            line-height: 1.2;
            white-space: nowrap;
        }

        .btn--primary {
            background: var(--color-accent);
            color: var(--color-bg-dark);
            border-color: var(--color-accent);
        }

        .btn--primary:hover,
        .btn--primary:focus {
            background: #00c291;
            border-color: #00c291;
            color: var(--color-bg-dark);
            box-shadow: 0 8px 22px -8px rgba(0, 217, 165, 0.5);
            transform: translateY(-2px);
        }

        .btn--ghost-light {
            background: transparent;
            color: var(--color-text-on-dark);
            border-color: rgba(255, 255, 255, 0.25);
        }

        .btn--ghost-light:hover,
        .btn--ghost-light:focus {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--color-accent);
            color: var(--color-accent);
        }

        .btn--header {
            background: transparent;
            color: var(--color-text-dark);
            border-color: rgba(11, 15, 20, 0.2);
        }

        .btn--header:hover,
        .btn--header:focus {
            background: var(--color-accent);
            border-color: var(--color-accent);
            color: var(--color-bg-dark);
        }

        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: var(--radius);
            align-items: center;
            justify-content: center;
            color: var(--color-text-dark);
            background: transparent;
            border: 1px solid rgba(11, 15, 20, 0.12);
            font-size: 18px;
        }

        @media (max-width: 1024px) {
            .main-nav {
                display: none;
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--color-bg-paper);
                border-bottom: 1px solid rgba(11, 15, 20, 0.08);
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
                padding: 16px 24px 24px;
                box-shadow: var(--shadow-card-hover);
                z-index: 40;
            }
            .main-nav.is-open {
                display: flex;
            }
            .main-nav__link {
                display: block;
                width: 100%;
                padding: 10px 14px;
            }
            .main-nav__link::after {
                left: 14px;
                right: 14px;
                bottom: 6px;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .header__actions .btn--header {
                display: none;
            }
        }

        @media (max-width: 640px) {
            .site-logo {
                font-size: 18px;
            }
            .site-logo__icon {
                width: 30px;
                height: 30px;
                font-size: 15px;
            }
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--color-text-mid);
            margin-bottom: 20px;
        }

        .breadcrumb__link {
            color: var(--color-text-mid);
            transition: color var(--transition-fast);
        }

        .breadcrumb__link:hover,
        .breadcrumb__link:focus {
            color: var(--color-accent);
        }

        .breadcrumb__sep {
            color: var(--color-text-light);
            font-size: 12px;
        }

        .breadcrumb__current {
            color: var(--color-text-dark);
            font-weight: 600;
        }

        /* Category Hero (矮横幅) */
        .cat-hero {
            background: var(--color-bg-paper);
            border-bottom: 1px solid rgba(11, 15, 20, 0.06);
            padding: 48px 0 40px;
        }

        .cat-hero__h1 {
            font-size: clamp(32px, 5vw, 56px);
            font-weight: 900;
            letter-spacing: -0.02em;
            line-height: 1.15;
            color: var(--color-text-dark);
            margin-bottom: 16px;
        }

        .cat-hero__desc {
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text-mid);
            max-width: 720px;
        }

        @media (max-width: 640px) {
            .cat-hero {
                padding: 32px 0 28px;
            }
            .cat-hero__h1 {
                font-size: 30px;
            }
        }

        /* Filter pills */
        .filter-bar {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            padding: 20px 0;
            border-bottom: 1px solid rgba(11, 15, 20, 0.06);
        }

        .filter-pill {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-mid);
            background: #fff;
            border: 1px solid rgba(11, 15, 20, 0.10);
            border-radius: var(--radius-pill);
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
        }

        .filter-pill:hover,
        .filter-pill:focus {
            color: var(--color-accent);
            border-color: var(--color-accent);
            background: rgba(0, 217, 165, 0.04);
            transform: translateY(-1px);
        }

        .filter-pill--active {
            background: var(--color-accent);
            border-color: var(--color-accent);
            color: var(--color-bg-dark);
        }

        .filter-pill--active:hover,
        .filter-pill--active:focus {
            background: #00c291;
            border-color: #00c291;
            color: var(--color-bg-dark);
        }

        /* Data list */
        .data-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .data-card {
            display: grid;
            grid-template-columns: 240px 1fr;
            gap: 20px;
            background: #fff;
            border: 1px solid rgba(11, 15, 20, 0.08);
            border-radius: var(--radius);
            padding: 18px;
            transition: box-shadow var(--transition-med), border-color var(--transition-med), transform var(--transition-med);
        }

        .data-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--color-accent);
            transform: translateY(-4px);
        }

        .data-card__thumb {
            width: 100%;
            aspect-ratio: 16 / 10;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--color-card-dark);
            flex-shrink: 0;
        }

        .data-card__thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-med);
        }

        .data-card:hover .data-card__thumb img {
            transform: scale(1.03);
        }

        .data-card__body {
            display: flex;
            flex-direction: column;
            justify-content: center;
            gap: 10px;
        }

        .data-card__meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 13px;
            color: var(--color-text-light);
        }

        .data-card__date {
            font-family: var(--font-mono);
            font-size: 12px;
            letter-spacing: 0.02em;
        }

        .data-card__tag {
            display: inline-flex;
            align-items: center;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-accent);
            background: rgba(0, 217, 165, 0.08);
            border-radius: var(--radius-pill);
            border: 1px solid rgba(0, 217, 165, 0.2);
        }

        .data-card__title {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: -0.01em;
            line-height: 1.35;
            color: var(--color-text-dark);
            margin: 0;
        }

        .data-card__excerpt {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-mid);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .data-card__readmore {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            position: relative;
            width: fit-content;
        }

        .data-card__readmore::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 1px;
            background: var(--color-accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform var(--transition-med);
        }

        .data-card__readmore:hover,
        .data-card__readmore:focus {
            color: #00c291;
        }

        .data-card__readmore:hover::after,
        .data-card__readmore:focus::after {
            transform: scaleX(1);
        }

        .data-card__readmore i {
            font-size: 13px;
            transition: transform var(--transition-fast);
        }

        .data-card__readmore:hover i,
        .data-card__readmore:focus i {
            transform: translateX(4px);
        }

        @media (max-width: 640px) {
            .data-card {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .data-card__thumb {
                aspect-ratio: 16 / 9;
            }
            .data-card__title {
                font-size: 18px;
            }
        }

        /* Hot cards */
        .hot-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .hot-card {
            display: flex;
            flex-direction: column;
            gap: 14px;
            background: #fff;
            border: 1px solid rgba(11, 15, 20, 0.08);
            border-radius: var(--radius);
            padding: 20px;
            transition: box-shadow var(--transition-med), border-color var(--transition-med), transform var(--transition-med);
        }

        .hot-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--color-accent);
            transform: translateY(-4px);
        }

        .hot-card__badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            font-weight: 700;
            color: var(--color-warning);
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }

        .hot-card__badge i {
            font-size: 12px;
        }

        .hot-card__rank {
            font-family: var(--font-mono);
            font-size: 42px;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1;
            letter-spacing: -0.02em;
        }

        .hot-card__title {
            font-size: 18px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--color-text-dark);
            margin: 0;
        }

        .hot-card__desc {
            font-size: 13px;
            line-height: 1.6;
            color: var(--color-text-mid);
        }

        @media (max-width: 1024px) {
            .hot-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .hot-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Metrics */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .metric-card {
            background: var(--color-card-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            padding: 24px;
            text-align: left;
            transition: border-color var(--transition-med), box-shadow var(--transition-med);
        }

        .metric-card:hover {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-dark-card);
        }

        .metric-card__value {
            font-family: var(--font-mono);
            font-size: clamp(36px, 5vw, 52px);
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--color-accent);
            line-height: 1.1;
            margin-bottom: 8px;
        }

        .metric-card__label {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-on-dark);
            letter-spacing: 0.01em;
        }

        .metric-card__note {
            font-size: 13px;
            color: var(--color-text-dim-on-dark);
            margin-top: 4px;
        }

        @media (max-width: 640px) {
            .metrics-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Tag cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag-cloud__link {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-mid);
            background: #fff;
            border: 1px solid rgba(11, 15, 20, 0.10);
            border-radius: var(--radius-pill);
            transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
        }

        .tag-cloud__link:hover,
        .tag-cloud__link:focus {
            color: var(--color-accent);
            border-color: var(--color-accent);
            background: rgba(0, 217, 165, 0.04);
            transform: translateY(-2px);
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: #fff;
            border: 1px solid rgba(11, 15, 20, 0.08);
            border-radius: var(--radius);
            overflow: hidden;
            transition: border-color var(--transition-med), box-shadow var(--transition-med);
        }

        .faq-item:hover {
            border-color: rgba(0, 217, 165, 0.4);
        }

        .faq-item.is-active {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-card);
        }

        .faq-item__btn {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 20px;
            font-size: 16px;
            font-weight: 700;
            color: var(--color-text-dark);
            text-align: left;
            transition: color var(--transition-fast);
        }

        .faq-item__btn:hover,
        .faq-item__btn:focus {
            color: var(--color-accent);
        }

        .faq-item__icon {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            border: 1px solid rgba(11, 15, 20, 0.12);
            color: var(--color-text-mid);
            font-size: 13px;
            transition: transform var(--transition-med), color var(--transition-fast), border-color var(--transition-fast);
        }

        .faq-item.is-active .faq-item__icon {
            transform: rotate(180deg);
            color: var(--color-accent);
            border-color: var(--color-accent);
        }

        .faq-item__answer {
            display: none;
            padding: 0 20px 18px;
            font-size: 14px;
            line-height: 1.75;
            color: var(--color-text-mid);
        }

        .faq-item.is-active .faq-item__answer {
            display: block;
        }

        /* CTA subscribe */
        .cta-banner {
            background: var(--color-bg-dark);
            background-image: linear-gradient(rgba(11, 15, 20, 0.82), rgba(11, 15, 20, 0.88)), url('/assets/images/3c6ceca2026cd13f.jpg');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius);
            padding: 48px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
        }

        .cta-banner__title {
            font-size: clamp(24px, 3vw, 34px);
            font-weight: 800;
            letter-spacing: -0.01em;
            color: var(--color-text-on-dark);
            margin-bottom: 12px;
        }

        .cta-banner__desc {
            font-size: 15px;
            line-height: 1.7;
            color: var(--color-text-dim-on-dark);
            max-width: 420px;
        }

        .cta-form {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .cta-form__input {
            background: var(--color-card-dark);
            border: 1px solid var(--color-border-dark);
            border-radius: var(--radius);
            padding: 12px 16px;
            font-size: 15px;
            color: var(--color-text-on-dark);
            caret-color: var(--color-accent);
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }

        .cta-form__input::placeholder {
            color: var(--color-text-dim-on-dark);
        }

        .cta-form__input:focus {
            outline: none;
            border-color: var(--color-accent);
            box-shadow: 0 0 0 3px rgba(0, 217, 165, 0.12);
        }

        .btn--cta-full {
            width: 100%;
            justify-content: center;
        }

        @media (max-width: 1024px) {
            .cta-banner {
                grid-template-columns: 1fr;
                padding: 36px;
            }
        }

        @media (max-width: 640px) {
            .cta-banner {
                padding: 28px 20px;
            }
        }

        /* Footer */
        .site-footer {
            background: var(--color-bg-dark);
            color: var(--color-text-dim-on-dark);
            padding: 56px 0 0;
            font-size: 14px;
        }

        .footer__grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 40px;
        }

        .footer__brand-text {
            margin-top: 16px;
            line-height: 1.7;
            color: var(--color-text-dim-on-dark);
            max-width: 300px;
        }

        .footer__col h4 {
            font-size: 13px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--color-text-on-dark);
            margin-bottom: 16px;
        }

        .footer__links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer__links a {
            color: var(--color-text-dim-on-dark);
            transition: color var(--transition-fast), padding-left var(--transition-fast);
        }

        .footer__links a:hover,
        .footer__links a:focus {
            color: var(--color-accent);
            padding-left: 4px;
        }

        .footer__bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 20px 0;
            border-top: 1px solid var(--color-border-dark);
            font-size: 13px;
        }

        .footer__legal {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer__legal a {
            color: var(--color-text-dim-on-dark);
            transition: color var(--transition-fast);
        }

        .footer__legal a:hover,
        .footer__legal a:focus {
            color: var(--color-accent);
        }

        @media (max-width: 1024px) {
            .footer__grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
        }

        @media (max-width: 640px) {
            .footer__grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer__bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        /* Utility */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip-path: inset(50%);
            white-space: nowrap;
            border: 0;
        }

/* roulang page: category6 */
:root {
        --color-bg-dark: #0B0F14;
        --color-bg-paper: #F4F6F8;
        --color-accent: #00D9A5;
        --color-warning: #FF5C35;
        --color-card-dark: #1B232E;
        --color-border-dark: #2A3442;
        --color-positive: #2EE6A8;
        --color-negative: #FF4D4D;
        --color-text-dark: #0B0F14;
        --color-text-mid: #5A6572;
        --color-text-light: #9BA6B2;
        --color-text-on-dark: #E8EDF2;
        --color-text-dim-on-dark: #8B97A4;
        --font-sans: "Inter", "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Consolas", "Monaco", monospace;
        --radius: 4px;
        --radius-pill: 999px;
        --shadow-card: 0 2px 8px -2px rgba(0, 0, 0, 0.12);
        --shadow-card-hover: 0 18px 40px -24px rgba(0, 0, 0, 0.65);
        --shadow-dark-card: 0 4px 14px -4px rgba(0, 0, 0, 0.45);
        --transition-fast: 0.18s ease;
        --transition-med: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        --section-pad-desktop: 96px;
        --section-pad-mobile: 56px;
        --gap-section: 56px;
        --header-height: 68px;
    }

    *,
    *::before,
    *::after {
        box-sizing: border-box;
    }

    html {
        scroll-behavior: smooth;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    body {
        font-family: var(--font-sans);
        font-size: 15px;
        line-height: 1.8;
        color: var(--color-text-dark);
        background-color: var(--color-bg-paper);
        margin: 0;
        padding: 0;
        overflow-x: hidden;
    }

    a {
        color: var(--color-accent);
        text-decoration: none;
        transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
    }

    a:hover,
    a:focus {
        color: #00c291;
    }

    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
        outline: 2px solid var(--color-accent);
        outline-offset: 3px;
        border-radius: 2px;
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
    }

    button,
    input,
    select,
    textarea {
        font-family: inherit;
        font-size: inherit;
        line-height: inherit;
    }

    button {
        cursor: pointer;
        border: none;
        background: none;
        padding: 0;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding-left: 24px;
        padding-right: 24px;
    }

    @media (max-width: 640px) {
        .container {
            padding-left: 16px;
            padding-right: 16px;
        }
    }

    .section {
        padding: var(--section-pad-desktop) 0;
    }

    @media (max-width: 640px) {
        .section {
            padding: var(--section-pad-mobile) 0;
        }
    }

    .section--dark {
        background: var(--color-bg-dark);
        color: var(--color-text-on-dark);
    }
    .section--dark h1,
    .section--dark h2,
    .section--dark h3,
    .section--dark h4 {
        color: var(--color-text-on-dark);
    }
    .section--dark p {
        color: var(--color-text-dim-on-dark);
    }
    .section--dark .text-mid {
        color: var(--color-text-dim-on-dark);
    }

    .section--paper {
        background: var(--color-bg-paper);
    }

    .section--carbon {
        background: #121820;
        color: var(--color-text-on-dark);
    }
    .section--carbon h2,
    .section--carbon h3,
    .section--carbon h4 {
        color: var(--color-text-on-dark);
    }
    .section--carbon p {
        color: var(--color-text-dim-on-dark);
    }

    .section--accent-tint {
        background: #EAFCF7;
    }

    .section--grid-pattern {
        background-image:
            linear-gradient(rgba(15, 32, 28, 0.04) 1px, transparent 1px),
            linear-gradient(90deg, rgba(15, 32, 28, 0.04) 1px, transparent 1px);
        background-size: 32px 32px;
    }

    .section__header {
        margin-bottom: 40px;
        max-width: 720px;
    }
    .section__header--center {
        margin-left: auto;
        margin-right: auto;
        text-align: center;
    }

    .section__eyebrow {
        display: inline-block;
        font-size: 13px;
        font-weight: 700;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--color-accent);
        margin-bottom: 12px;
    }
    .section__eyebrow--dark {
        color: var(--color-accent);
    }

    .section__title {
        font-size: clamp(26px, 3.8vw, 42px);
        font-weight: 800;
        letter-spacing: -0.015em;
        line-height: 1.2;
        margin-bottom: 16px;
        color: var(--color-text-dark);
    }
    .section__title--dark {
        color: var(--color-text-on-dark);
    }

    .section__desc {
        font-size: 16px;
        line-height: 1.75;
        color: var(--color-text-mid);
        max-width: 620px;
    }
    .section__desc--center {
        margin-left: auto;
        margin-right: auto;
        text-align: center;
    }
    .section--dark .section__desc,
    .section--dark .section__desc p {
        color: var(--color-text-dim-on-dark);
    }

    .grid {
        display: grid;
        gap: 24px;
    }
    .grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
    }

    @media (max-width: 1024px) {
        .grid-3 {
            grid-template-columns: repeat(2, 1fr);
        }
        .grid-4 {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media (max-width: 640px) {
        .grid-2,
        .grid-3,
        .grid-4 {
            grid-template-columns: 1fr;
        }
    }

    /* ========== Header / Navigation ========== */
    .site-header {
        background: var(--color-bg-dark);
        color: var(--color-text-on-dark);
        position: sticky;
        top: 0;
        z-index: 100;
        height: var(--header-height);
        display: flex;
        align-items: center;
        border-bottom: 1px solid var(--color-border-dark);
    }
    .site-header .container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        gap: 16px;
    }
    .site-logo {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        font-weight: 800;
        font-size: 18px;
        letter-spacing: -0.01em;
        color: var(--color-text-on-dark);
        white-space: nowrap;
        transition: color var(--transition-fast);
    }
    .site-logo:hover,
    .site-logo:focus {
        color: var(--color-accent);
    }
    .site-logo__icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 30px;
        height: 30px;
        border-radius: var(--radius);
        background: var(--color-accent);
        color: var(--color-bg-dark);
        font-size: 14px;
        flex-shrink: 0;
    }
    .main-nav {
        display: flex;
        align-items: center;
        gap: 4px;
        list-style: none;
        margin: 0;
        padding: 0;
    }
    .main-nav__item {
        position: relative;
    }
    .main-nav__link {
        display: inline-flex;
        align-items: center;
        padding: 8px 12px;
        font-size: 14px;
        font-weight: 600;
        color: var(--color-text-light);
        border-radius: var(--radius);
        position: relative;
        transition: color var(--transition-fast), background var(--transition-fast);
        white-space: nowrap;
    }
    .main-nav__link::after {
        content: "";
        position: absolute;
        left: 12px;
        right: 100%;
        bottom: 4px;
        height: 2px;
        background: var(--color-accent);
        transition: right var(--transition-med);
        border-radius: 2px;
    }
    .main-nav__link:hover,
    .main-nav__link:focus {
        color: var(--color-text-on-dark);
        background: rgba(255, 255, 255, 0.04);
    }
    .main-nav__link:hover::after,
    .main-nav__link:focus::after {
        right: 12px;
    }
    .main-nav__link--active {
        color: var(--color-accent);
    }
    .main-nav__link--active::after {
        right: 12px;
    }
    .header-actions {
        display: flex;
        align-items: center;
        gap: 12px;
        flex-shrink: 0;
    }
    .header-search {
        position: relative;
        display: flex;
        align-items: center;
    }
    .header-search__input {
        width: 160px;
        padding: 8px 32px 8px 12px;
        background: var(--color-card-dark);
        border: 1px solid var(--color-border-dark);
        border-radius: var(--radius-pill);
        color: var(--color-text-on-dark);
        font-size: 13px;
        transition: border-color var(--transition-fast), width var(--transition-med), background var(--transition-fast);
    }
    .header-search__input::placeholder {
        color: var(--color-text-dim-on-dark);
    }
    .header-search__input:focus {
        outline: none;
        border-color: var(--color-accent);
        width: 200px;
        background: #10161D;
    }
    .header-search__btn {
        position: absolute;
        right: 8px;
        color: var(--color-text-light);
        font-size: 13px;
        transition: color var(--transition-fast), transform var(--transition-fast);
        background: none;
        border: none;
        cursor: pointer;
    }
    .header-search__btn:hover {
        color: var(--color-accent);
        transform: rotate(10deg);
    }
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 10px 20px;
        font-size: 14px;
        font-weight: 700;
        border-radius: var(--radius);
        transition: all var(--transition-fast);
        cursor: pointer;
        line-height: 1.4;
        letter-spacing: 0.01em;
        white-space: nowrap;
    }
    .btn--primary {
        background: var(--color-accent);
        color: var(--color-bg-dark);
        position: relative;
        overflow: hidden;
    }
    .btn--primary::before {
        content: "";
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.12);
        transition: left var(--transition-med);
        z-index: 1;
    }
    .btn--primary:hover::before,
    .btn--primary:focus::before {
        left: 0;
    }
    .btn--primary:hover,
    .btn--primary:focus {
        background: #00c291;
        color: var(--color-bg-dark);
    }
    .btn--primary span {
        position: relative;
        z-index: 2;
    }
    .btn--primary .fa-arrow-right {
        transition: transform var(--transition-fast);
        position: relative;
        z-index: 2;
    }
    .btn--primary:hover .fa-arrow-right {
        transform: translateX(4px);
    }
    .btn--outline {
        background: transparent;
        color: var(--color-accent);
        border: 1px solid var(--color-accent);
    }
    .btn--outline:hover,
    .btn--outline:focus {
        background: rgba(0, 217, 165, 0.08);
        color: #00c291;
        border-color: #00c291;
    }
    .btn--outline-dark {
        background: transparent;
        color: var(--color-text-on-dark);
        border: 1px solid var(--color-border-dark);
    }
    .btn--outline-dark:hover,
    .btn--outline-dark:focus {
        border-color: var(--color-accent);
        color: var(--color-accent);
    }
    .btn--sm {
        padding: 7px 14px;
        font-size: 13px;
    }
    .btn--header {
        padding: 8px 16px;
        font-size: 13px;
        background: var(--color-accent);
        color: var(--color-bg-dark);
        position: relative;
        overflow: hidden;
    }
    .btn--header::before {
        content: "";
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.12);
        transition: left var(--transition-med);
        z-index: 1;
    }
    .btn--header:hover::before,
    .btn--header:focus::before {
        left: 0;
    }
    .btn--header:hover,
    .btn--header:focus {
        background: #00c291;
        color: var(--color-bg-dark);
    }
    .btn--header span {
        position: relative;
        z-index: 2;
    }
    .nav-toggle {
        display: none;
        flex-direction: column;
        gap: 4px;
        cursor: pointer;
        padding: 8px;
        border-radius: var(--radius);
        background: none;
        border: none;
        transition: background var(--transition-fast);
    }
    .nav-toggle:hover {
        background: rgba(255, 255, 255, 0.06);
    }
    .nav-toggle__bar {
        display: block;
        width: 22px;
        height: 2px;
        background: var(--color-text-on-dark);
        transition: all var(--transition-fast);
        border-radius: 2px;
    }
    .nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
    }
    .nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }

    @media (max-width: 1024px) {
        .nav-toggle {
            display: flex;
        }
        .main-nav {
            position: fixed;
            top: var(--header-height);
            right: 0;
            bottom: 0;
            width: min(320px, 85vw);
            background: var(--color-bg-dark);
            flex-direction: column;
            align-items: flex-start;
            padding: 32px 24px;
            gap: 8px;
            border-left: 1px solid var(--color-border-dark);
            transform: translateX(100%);
            transition: transform var(--transition-med);
            z-index: 99;
            overflow-y: auto;
        }
        .main-nav.is-open {
            transform: translateX(0);
        }
        .main-nav__link {
            font-size: 16px;
            padding: 12px 16px;
            width: 100%;
        }
        .main-nav__link::after {
            left: 16px;
            right: auto;
            bottom: 6px;
            width: 0;
            height: 2px;
            transition: width var(--transition-med);
        }
        .main-nav__link:hover::after,
        .main-nav__link:focus::after,
        .main-nav__link--active::after {
            width: 32px;
            right: auto;
        }
        .header-search {
            display: none;
        }
        .btn--header {
            display: none;
        }
    }

    @media (max-width: 640px) {
        .header-search__input {
            width: 120px;
        }
        .header-search__input:focus {
            width: 150px;
        }
    }

    /* ========== Breadcrumb ========== */
    .breadcrumb {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 8px;
        font-size: 13px;
        color: var(--color-text-mid);
        margin-bottom: 20px;
        list-style: none;
        padding: 0;
    }
    .breadcrumb__item {
        display: inline-flex;
        align-items: center;
        gap: 8px;
    }
    .breadcrumb__link {
        color: var(--color-text-mid);
        transition: color var(--transition-fast);
    }
    .breadcrumb__link:hover,
    .breadcrumb__link:focus {
        color: var(--color-accent);
    }
    .breadcrumb__sep {
        color: var(--color-text-light);
        font-size: 10px;
    }
    .breadcrumb__current {
        color: var(--color-text-dark);
        font-weight: 600;
    }
    .section--dark .breadcrumb__link {
        color: var(--color-text-dim-on-dark);
    }
    .section--dark .breadcrumb__link:hover,
    .section--dark .breadcrumb__link:focus {
        color: var(--color-accent);
    }
    .section--dark .breadcrumb__current {
        color: var(--color-text-on-dark);
    }
    .section--dark .breadcrumb__sep {
        color: var(--color-text-dim-on-dark);
    }

    /* ========== Category Hero ========== */
    .category-hero {
        background: var(--color-bg-dark);
        color: var(--color-text-on-dark);
        padding: 48px 0 56px;
        border-bottom: 1px solid var(--color-border-dark);
        position: relative;
        overflow: hidden;
    }
    .category-hero::after {
        content: "";
        position: absolute;
        top: -80px;
        right: -80px;
        width: 280px;
        height: 280px;
        border-radius: 50%;
        background: rgba(0, 217, 165, 0.06);
        pointer-events: none;
    }
    .category-hero .container {
        position: relative;
        z-index: 1;
    }
    .category-hero__title {
        font-size: clamp(34px, 5vw, 52px);
        font-weight: 900;
        letter-spacing: -0.02em;
        line-height: 1.15;
        margin-bottom: 16px;
        color: var(--color-text-on-dark);
    }
    .category-hero__title .highlight {
        color: var(--color-accent);
    }
    .category-hero__desc {
        font-size: 16px;
        line-height: 1.75;
        color: var(--color-text-dim-on-dark);
        max-width: 560px;
        margin: 0;
    }

    /* ========== Category Tags ========== */
    .category-tags {
        background: var(--color-bg-paper);
        padding: 20px 0;
        border-bottom: 1px solid #E2E8EF;
        position: relative;
        z-index: 2;
    }
    .category-tags__wrap {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 10px;
    }
    .category-tags__label {
        font-size: 13px;
        font-weight: 700;
        color: var(--color-text-mid);
        margin-right: 4px;
        white-space: nowrap;
    }
    .tag-pill {
        display: inline-flex;
        align-items: center;
        padding: 6px 16px;
        font-size: 13px;
        font-weight: 600;
        color: var(--color-text-dark);
        background: #FFFFFF;
        border: 1px solid #DFE5EC;
        border-radius: var(--radius-pill);
        cursor: pointer;
        transition: all var(--transition-fast);
        white-space: nowrap;
    }
    .tag-pill:hover,
    .tag-pill:focus {
        border-color: var(--color-accent);
        color: var(--color-accent);
        background: #F0FBF8;
    }
    .tag-pill--active {
        background: var(--color-accent);
        color: var(--color-bg-dark);
        border-color: var(--color-accent);
    }
    .tag-pill--active:hover,
    .tag-pill--active:focus {
        background: #00c291;
        color: var(--color-bg-dark);
        border-color: #00c291;
    }

    /* ========== Category List ========== */
    .category-list {
        background: var(--color-bg-paper);
    }
    .category-list__grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    @media (max-width: 1024px) {
        .category-list__grid {
            grid-template-columns: 1fr;
        }
    }

    .post-card {
        display: flex;
        gap: 20px;
        background: #FFFFFF;
        border: 1px solid #E2E8EF;
        border-radius: var(--radius);
        padding: 20px;
        transition: all var(--transition-med);
        box-shadow: var(--shadow-card);
        position: relative;
    }
    .post-card:hover {
        box-shadow: var(--shadow-card-hover);
        border-color: #C8D5DE;
        transform: translateY(-4px);
    }
    .post-card__thumb {
        flex-shrink: 0;
        width: 160px;
        height: 110px;
        border-radius: var(--radius);
        overflow: hidden;
        background: #E8EDF2;
        position: relative;
    }
    .post-card__thumb img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform var(--transition-med);
    }
    .post-card:hover .post-card__thumb img {
        transform: scale(1.03);
    }
    .post-card__body {
        flex: 1;
        min-width: 0;
        display: flex;
        flex-direction: column;
    }
    .post-card__meta {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 8px;
        font-size: 12px;
        color: var(--color-text-mid);
        margin-bottom: 8px;
    }
    .post-card__date {
        font-family: var(--font-mono);
        font-size: 12px;
        color: var(--color-text-light);
        white-space: nowrap;
    }
    .post-card__tag {
        display: inline-flex;
        align-items: center;
        padding: 2px 10px;
        font-size: 11px;
        font-weight: 700;
        border-radius: var(--radius-pill);
        background: #F0F6F4;
        color: #008F6B;
        white-space: nowrap;
    }
    .post-card__tag--hot {
        background: #FFF0EC;
        color: var(--color-warning);
    }
    .post-card__title {
        font-size: 17px;
        font-weight: 700;
        line-height: 1.45;
        margin-bottom: 8px;
        color: var(--color-text-dark);
    }
    .post-card__title a {
        color: inherit;
        transition: color var(--transition-fast);
    }
    .post-card__title a:hover,
    .post-card__title a:focus {
        color: var(--color-accent);
    }
    .post-card__excerpt {
        font-size: 14px;
        line-height: 1.7;
        color: var(--color-text-mid);
        margin-bottom: 12px;
        flex: 1;
    }
    .post-card__more {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        font-weight: 600;
        color: var(--color-accent);
        transition: all var(--transition-fast);
        align-self: flex-start;
    }
    .post-card__more .fa-arrow-right {
        font-size: 11px;
        transition: transform var(--transition-fast);
    }
    .post-card__more:hover,
    .post-card__more:focus {
        color: #00c291;
    }
    .post-card__more:hover .fa-arrow-right {
        transform: translateX(4px);
    }

    @media (max-width: 640px) {
        .post-card {
            flex-direction: column;
            gap: 14px;
            padding: 16px;
        }
        .post-card__thumb {
            width: 100%;
            height: auto;
            aspect-ratio: 16/9;
        }
    }

    /* ========== Category Hot ========== */
    .category-hot {
        background: var(--color-bg-dark);
    }
    .category-hot__grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    @media (max-width: 1024px) {
        .category-hot__grid {
            grid-template-columns: 1fr;
        }
    }
    .hot-card {
        background: var(--color-card-dark);
        border: 1px solid var(--color-border-dark);
        border-radius: var(--radius);
        padding: 24px;
        transition: all var(--transition-med);
        box-shadow: var(--shadow-dark-card);
        position: relative;
        overflow: hidden;
    }
    .hot-card:hover {
        border-color: var(--color-accent);
        transform: translateY(-4px);
        box-shadow: 0 20px 44px -20px rgba(0, 0, 0, 0.7);
    }
    .hot-card__rank {
        position: absolute;
        top: 20px;
        right: 20px;
        font-family: var(--font-mono);
        font-size: 40px;
        font-weight: 900;
        color: rgba(0, 217, 165, 0.2);
        line-height: 1;
        pointer-events: none;
    }
    .hot-card__badge {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        padding: 3px 10px;
        font-size: 11px;
        font-weight: 700;
        border-radius: var(--radius-pill);
        background: rgba(0, 217, 165, 0.12);
        color: var(--color-accent);
        margin-bottom: 12px;
        text-transform: uppercase;
        letter-spacing: 0.05em;
    }
    .hot-card__title {
        font-size: 18px;
        font-weight: 700;
        line-height: 1.4;
        margin-bottom: 10px;
        color: var(--color-text-on-dark);
    }
    .hot-card__title a {
        color: inherit;
        transition: color var(--transition-fast);
    }
    .hot-card__title a:hover,
    .hot-card__title a:focus {
        color: var(--color-accent);
    }
    .hot-card__desc {
        font-size: 14px;
        line-height: 1.7;
        color: var(--color-text-dim-on-dark);
        margin: 0 0 16px;
    }
    .hot-card__link {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        font-weight: 600;
        color: var(--color-accent);
        transition: all var(--transition-fast);
    }
    .hot-card__link:hover,
    .hot-card__link:focus {
        color: #00c291;
    }
    .hot-card__link .fa-arrow-right {
        font-size: 11px;
        transition: transform var(--transition-fast);
    }
    .hot-card__link:hover .fa-arrow-right {
        transform: translateX(4px);
    }

    /* ========== Category Stats ========== */
    .category-stats {
        background: var(--color-bg-paper);
    }
    .category-stats__grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    @media (max-width: 1024px) {
        .category-stats__grid {
            grid-template-columns: 1fr;
        }
    }
    .stat-card {
        background: #FFFFFF;
        border: 1px solid #E2E8EF;
        border-radius: var(--radius);
        padding: 24px;
        text-align: center;
        transition: all var(--transition-fast);
    }
    .stat-card:hover {
        box-shadow: var(--shadow-card);
        border-color: #C8D5DE;
    }
    .stat-card__value {
        font-family: var(--font-mono);
        font-size: 36px;
        font-weight: 900;
        color: var(--color-accent);
        letter-spacing: -0.02em;
        line-height: 1.2;
        margin-bottom: 4px;
    }
    .stat-card__unit {
        font-size: 15px;
        font-weight: 700;
        color: var(--color-text-mid);
        margin-left: 4px;
    }
    .stat-card__label {
        font-size: 14px;
        color: var(--color-text-mid);
        margin: 0;
    }

    /* ========== Category Topics ========== */
    .category-topics {
        background: #F8FAFC;
    }
    .category-topics__cloud {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
    }
    .topic-card {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 12px 20px;
        background: #FFFFFF;
        border: 1px solid #E2E8EF;
        border-radius: var(--radius);
        font-size: 14px;
        font-weight: 600;
        color: var(--color-text-dark);
        transition: all var(--transition-fast);
        cursor: pointer;
        text-decoration: none;
    }
    .topic-card:hover,
    .topic-card:focus {
        border-color: var(--color-accent);
        color: var(--color-accent);
        box-shadow: var(--shadow-card);
        transform: translateY(-2px);
    }
    .topic-card .fa-solid,
    .topic-card .fa-regular {
        color: var(--color-accent);
        font-size: 13px;
    }

    /* ========== FAQ ========== */
    .category-faq {
        background: var(--color-bg-paper);
    }
    .faq-accordion {
        max-width: 720px;
        margin: 0 auto;
    }
    .faq-item {
        border: 1px solid #E2E8EF;
        border-radius: var(--radius);
        background: #FFFFFF;
        margin-bottom: 12px;
        overflow: hidden;
        transition: all var(--transition-fast);
    }
    .faq-item:hover {
        border-color: #C8D5DE;
    }
    .faq-item.is-active {
        border-color: var(--color-accent);
        box-shadow: var(--shadow-card);
    }
    .faq-item__trigger {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        padding: 18px 20px;
        font-size: 15px;
        font-weight: 700;
        color: var(--color-text-dark);
        cursor: pointer;
        transition: color var(--transition-fast);
        text-align: left;
        width: 100%;
        background: none;
        border: none;
    }
    .faq-item__trigger:hover,
    .faq-item__trigger:focus {
        color: var(--color-accent);
    }
    .faq-item__icon {
        flex-shrink: 0;
        width: 24px;
        height: 24px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background: #F0F6F4;
        color: var(--color-accent);
        font-size: 12px;
        transition: transform var(--transition-fast);
    }
    .faq-item.is-active .faq-item__icon {
        transform: rotate(180deg);
        background: var(--color-accent);
        color: var(--color-bg-dark);
    }
    .faq-item__content {
        padding: 0 20px 20px;
        font-size: 14px;
        line-height: 1.75;
        color: var(--color-text-mid);
        display: none;
    }
    .faq-item.is-active .faq-item__content {
        display: block;
    }

    /* ========== CTA Section ========== */
    .category-cta {
        background: var(--color-bg-dark);
        color: var(--color-text-on-dark);
        position: relative;
        overflow: hidden;
    }
    .category-cta::before {
        content: "";
        position: absolute;
        top: -100px;
        left: -100px;
        width: 320px;
        height: 320px;
        border-radius: 50%;
        background: rgba(0, 217, 165, 0.08);
        pointer-events: none;
    }
    .category-cta .container {
        position: relative;
        z-index: 1;
    }
    .cta-box {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 48px;
        align-items: center;
    }
    @media (max-width: 1024px) {
        .cta-box {
            grid-template-columns: 1fr;
            gap: 32px;
        }
    }
    .cta-box__title {
        font-size: clamp(24px, 3vw, 34px);
        font-weight: 800;
        letter-spacing: -0.015em;
        line-height: 1.25;
        margin-bottom: 12px;
        color: var(--color-text-on-dark);
    }
    .cta-box__desc {
        font-size: 15px;
        line-height: 1.75;
        color: var(--color-text-dim-on-dark);
        margin: 0;
        max-width: 480px;
    }
    .cta-form {
        display: flex;
        gap: 12px;
        align-items: center;
    }
    @media (max-width: 640px) {
        .cta-form {
            flex-direction: column;
            align-items: stretch;
        }
    }
    .cta-form__input {
        flex: 1;
        padding: 12px 16px;
        background: var(--color-card-dark);
        border: 1px solid var(--color-border-dark);
        border-radius: var(--radius);
        color: var(--color-text-on-dark);
        font-size: 14px;
        transition: border-color var(--transition-fast), background var(--transition-fast);
    }
    .cta-form__input::placeholder {
        color: var(--color-text-dim-on-dark);
    }
    .cta-form__input:focus {
        outline: none;
        border-color: var(--color-accent);
        background: #10161D;
    }
    .cta-form__btn {
        padding: 12px 24px;
        font-size: 14px;
        font-weight: 700;
        border-radius: var(--radius);
        background: var(--color-accent);
        color: var(--color-bg-dark);
        position: relative;
        overflow: hidden;
        transition: all var(--transition-fast);
        cursor: pointer;
        white-space: nowrap;
    }
    .cta-form__btn::before {
        content: "";
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.12);
        transition: left var(--transition-med);
        z-index: 1;
    }
    .cta-form__btn:hover::before,
    .cta-form__btn:focus::before {
        left: 0;
    }
    .cta-form__btn:hover,
    .cta-form__btn:focus {
        background: #00c291;
        color: var(--color-bg-dark);
    }
    .cta-form__btn span {
        position: relative;
        z-index: 2;
    }

    /* ========== Footer ========== */
    .site-footer {
        background: var(--color-bg-dark);
        color: var(--color-text-on-dark);
        padding: 56px 0 28px;
        border-top: 1px solid var(--color-border-dark);
    }
    .site-footer .site-logo {
        margin-bottom: 14px;
    }
    .footer__grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
        margin-bottom: 40px;
    }
    @media (max-width: 1024px) {
        .footer__grid {
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
    }
    @media (max-width: 640px) {
        .footer__grid {
            grid-template-columns: 1fr;
            gap: 24px;
        }
    }
    .footer__brand-text {
        font-size: 14px;
        line-height: 1.75;
        color: var(--color-text-dim-on-dark);
        margin: 0 0 16px;
        max-width: 340px;
    }
    .footer__col h4 {
        font-size: 14px;
        font-weight: 700;
        color: var(--color-text-on-dark);
        margin-bottom: 14px;
        letter-spacing: 0.02em;
    }
    .footer__links {
        list-style: none;
        margin: 0;
        padding: 0;
        display: flex;
        flex-direction: column;
        gap: 8px;
    }
    .footer__links a {
        font-size: 14px;
        color: var(--color-text-dim-on-dark);
        transition: color var(--transition-fast);
    }
    .footer__links a:hover,
    .footer__links a:focus {
        color: var(--color-accent);
    }
    .footer__bottom {
        display: flex;
        align-items: center;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 12px;
        padding-top: 20px;
        border-top: 1px solid var(--color-border-dark);
        font-size: 13px;
        color: var(--color-text-dim-on-dark);
    }
    .footer__legal {
        display: flex;
        align-items: center;
        gap: 10px;
    }
    .footer__legal a {
        color: var(--color-text-dim-on-dark);
        transition: color var(--transition-fast);
    }
    .footer__legal a:hover,
    .footer__legal a:focus {
        color: var(--color-accent);
    }
    .footer__legal span {
        color: var(--color-border-dark);
    }

    /* ========== Utilities ========== */
    .text-center {
        text-align: center;
    }
    .text-accent {
        color: var(--color-accent);
    }
    .text-mid {
        color: var(--color-text-mid);
    }
    .section--dark .text-mid {
        color: var(--color-text-dim-on-dark);
    }
    .mt-0 {
        margin-top: 0;
    }
    .mb-0 {
        margin-bottom: 0;
    }
    .mb-16 {
        margin-bottom: 16px;
    }
    .mb-24 {
        margin-bottom: 24px;
    }
    .mb-32 {
        margin-bottom: 32px;
    }
    .gap-24 {
        gap: 24px;
    }
    .flex-center {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .aspect-16-9 {
        aspect-ratio: 16/9;
    }
    .w-full {
        width: 100%;
    }

    @media (prefers-reduced-motion: reduce) {
        *,
        *::before,
        *::after {
            transition-duration: 0.01ms !important;
            animation-duration: 0.01ms !important;
            scroll-behavior: auto !important;
        }
    }