/* roulang page: index */
:root {
            --primary: #1F4E79;
            --primary-dark: #163A5A;
            --primary-light: #2B5F84;
            --accent: #C9A961;
            --accent-soft: #E8D9B8;
            --bg: #F4F7FA;
            --bg-alt: #EAF1F7;
            --surface: #FFFFFF;
            --text: #1A2B3C;
            --text-secondary: #4A5E71;
            --text-muted: #7A8B9A;
            --border: #E3EAF0;
            --border-strong: #D0DCE6;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-pill: 999px;
            --shadow-card: 0 8px 24px rgba(30,50,70,0.06);
            --shadow-hover: 0 12px 36px rgba(30,50,70,0.11);
            --shadow-nav: 0 2px 12px rgba(30,50,70,0.05);
            --space-section: 72px;
            --space-section-mobile: 44px;
            --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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: 1.75;
            color: var(--text);
            background: var(--bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover,
        a:focus {
            color: var(--primary-dark);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-serif);
            color: var(--text);
            line-height: 1.35;
            margin: 0 0 0.75rem;
            font-weight: 600;
        }

        h1 {
            font-size: clamp(2rem, 4.2vw, 3.2rem);
            letter-spacing: 0.02em;
        }

        h2 {
            font-size: clamp(1.5rem, 2.6vw, 2.1rem);
            letter-spacing: 0.01em;
        }

        h3 {
            font-size: clamp(1.1rem, 1.5vw, 1.35rem);
        }

        p {
            margin: 0 0 1rem;
            color: var(--text-secondary);
        }

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

        .container-wide {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .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;
        }

        /* ========== TOP BAR ========== */
        .site-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-nav);
        }

        .site-header .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
            flex-wrap: wrap;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.04em;
            white-space: nowrap;
        }

        .brand-logo .logo-mark {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 600;
            flex-shrink: 0;
        }

        .brand-logo .logo-sub {
            font-size: 0.55rem;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 0.12em;
            display: block;
            line-height: 1.2;
            margin-top: 2px;
            font-family: var(--font-sans);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--bg-alt);
        }

        .main-nav a.active {
            color: var(--primary-dark);
            background: var(--bg-alt);
            font-weight: 600;
            position: relative;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            font-size: 1.2rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition);
        }

        .mobile-menu-toggle:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }

        /* ========== HERO ========== */
        .hero {
            position: relative;
            background: var(--primary-dark);
            color: #fff;
            overflow: hidden;
            min-height: 560px;
            display: flex;
            align-items: center;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.55;
            z-index: 1;
        }

        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(22,58,90,0.82) 0%, rgba(31,78,121,0.55) 45%, rgba(200,170,100,0.28) 100%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            padding: 72px 0 56px;
            max-width: 700px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.14);
            border: 1px solid rgba(255,255,255,0.28);
            color: #fff;
            padding: 6px 16px;
            border-radius: var(--radius-pill);
            font-size: 0.82rem;
            letter-spacing: 0.06em;
            margin-bottom: 20px;
            backdrop-filter: blur(6px);
        }

        .hero h1 {
            color: #fff;
            font-size: clamp(2.1rem, 4.5vw, 3.4rem);
            margin-bottom: 18px;
            text-shadow: 0 2px 16px rgba(0,0,0,0.2);
        }

        .hero-desc {
            color: rgba(255,255,255,0.88);
            font-size: 1.03rem;
            line-height: 1.85;
            margin-bottom: 28px;
            max-width: 620px;
        }

        .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 26px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            letter-spacing: 0.02em;
            cursor: pointer;
            transition: all var(--transition);
            border: 2px solid transparent;
            text-decoration: none;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary-dark);
            color: #fff;
            border-color: var(--primary-dark);
        }

        .btn-primary:hover {
            background: #0E2A44;
            border-color: #0E2A44;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.2);
        }

        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }

        .btn-accent:hover {
            background: #B8944E;
            border-color: #B8944E;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.18);
        }

        .btn-outline-light {
            background: transparent;
            color: #fff;
            border-color: rgba(255,255,255,0.55);
        }

        .btn-outline-light:hover {
            background: rgba(255,255,255,0.14);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }

        .btn-outline:hover {
            background: var(--bg-alt);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 9px 18px;
            font-size: 0.82rem;
        }

        /* Countdown */
        .countdown-bar {
            position: relative;
            z-index: 2;
            margin-top: 28px;
            background: rgba(255,255,255,0.1);
            border: 1px solid rgba(255,255,255,0.22);
            border-radius: var(--radius-md);
            padding: 16px 22px;
            display: flex;
            align-items: center;
            gap: 18px;
            flex-wrap: wrap;
            backdrop-filter: blur(8px);
        }

        .countdown-bar .cd-label {
            font-size: 0.85rem;
            letter-spacing: 0.04em;
            color: rgba(255,255,255,0.85);
            white-space: nowrap;
        }

        .countdown-timer {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .cd-item {
            background: rgba(255,255,255,0.14);
            border-radius: var(--radius-sm);
            padding: 6px 14px;
            text-align: center;
            min-width: 56px;
        }

        .cd-item .cd-num {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
            font-variant-numeric: tabular-nums;
        }

        .cd-item .cd-unit {
            font-size: 0.7rem;
            color: rgba(255,255,255,0.7);
            letter-spacing: 0.06em;
        }

        /* ========== PILL NAV ========== */
        .pill-nav-section {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            padding: 14px 0;
            position: relative;
            z-index: 5;
        }

        .pill-nav {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: var(--border-strong) transparent;
            padding: 2px 0;
        }

        .pill-nav::-webkit-scrollbar {
            height: 4px;
        }

        .pill-nav::-webkit-scrollbar-track {
            background: transparent;
        }

        .pill-nav::-webkit-scrollbar-thumb {
            background: var(--border-strong);
            border-radius: 2px;
        }

        .pill-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            border-radius: var(--radius-pill);
            font-size: 0.84rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--bg);
            border: 1px solid var(--border);
            white-space: nowrap;
            transition: all var(--transition);
            flex-shrink: 0;
        }

        .pill-link:hover {
            background: var(--bg-alt);
            color: var(--primary);
            border-color: var(--primary-light);
        }

        .pill-link.active {
            background: var(--primary-dark);
            color: #fff;
            border-color: var(--primary-dark);
            box-shadow: 0 4px 12px rgba(31,78,121,0.3);
        }

        /* ========== SECTIONS ========== */
        .section {
            padding: var(--space-section) 0;
        }

        .section-alt {
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-accent {
            background: var(--bg-alt);
        }

        .section-header {
            margin-bottom: 36px;
        }

        .section-header .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 10px;
        }

        .section-header .section-tag::before {
            content: '';
            width: 28px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }

        .section-header h2 {
            margin-bottom: 10px;
        }

        .section-header .section-desc {
            max-width: 680px;
            font-size: 0.95rem;
            line-height: 1.8;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ========== CARDS ========== */
        .card {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 28px;
            transition: all var(--transition);
            height: 100%;
        }

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

        .card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 16px;
            border: 1px solid var(--border);
        }

        .card h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
        }

        .card p {
            font-size: 0.88rem;
            line-height: 1.75;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ========== STATS ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .stat-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 28px 22px;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }

        .stat-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .stat-num {
            font-family: var(--font-serif);
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-dark);
            line-height: 1.2;
            letter-spacing: 0.02em;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }

        /* ========== COMPARISON TABLE ========== */
        .compare-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            background: var(--surface);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
        }

        .compare-table th,
        .compare-table td {
            padding: 16px 20px;
            text-align: left;
            font-size: 0.88rem;
            border-bottom: 1px solid var(--border);
        }

        .compare-table th {
            background: var(--bg-alt);
            font-weight: 600;
            color: var(--text);
            font-family: var(--font-sans);
            letter-spacing: 0.03em;
        }

        .compare-table tr:last-child td {
            border-bottom: none;
        }

        .compare-table .highlight-col {
            background: rgba(200,170,100,0.06);
            border-left: 2px solid var(--accent);
        }

        /* ========== TIMELINE ========== */
        .timeline {
            position: relative;
            padding-left: 32px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 8px;
            bottom: 8px;
            width: 2px;
            background: var(--border-strong);
            border-radius: 1px;
        }

        .timeline-item {
            position: relative;
            padding-bottom: 28px;
        }

        .timeline-item:last-child {
            padding-bottom: 0;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -28px;
            top: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
            border: 2px solid var(--surface);
            box-shadow: 0 0 0 2px var(--primary-light);
        }

        .timeline-item .tl-year {
            font-weight: 700;
            color: var(--primary-dark);
            font-size: 1rem;
            margin-bottom: 4px;
        }

        .timeline-item .tl-title {
            font-weight: 600;
            color: var(--text);
            font-size: 0.95rem;
            margin-bottom: 6px;
        }

        .timeline-item .tl-desc {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ========== FAQ ACCORDION ========== */
        .accordion {
            background: transparent;
        }

        .accordion-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
        }

        .accordion-item.is-active {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-card);
        }

        .accordion-title {
            background: none;
            border: none;
            padding: 18px 24px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            text-align: left;
            font-family: var(--font-sans);
            letter-spacing: 0.01em;
            transition: all var(--transition);
        }

        .accordion-title:hover {
            color: var(--primary);
        }

        .accordion-title::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.7rem;
            color: var(--text-muted);
            transition: transform var(--transition);
        }

        .accordion-item.is-active .accordion-title::after {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .accordion-content {
            display: none;
            padding: 0 24px 20px;
            font-size: 0.88rem;
            line-height: 1.75;
            color: var(--text-secondary);
        }

        .accordion-item.is-active .accordion-content {
            display: block;
        }

        /* ========== FORM ========== */
        .form-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 36px;
        }

        .form-group {
            margin-bottom: 18px;
        }

        .form-group label {
            display: block;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text);
            margin-bottom: 6px;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 11px 16px;
            border: 1px solid var(--border-strong);
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-family: var(--font-sans);
            color: var(--text);
            background: #fff;
            transition: all var(--transition);
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(31,78,121,0.12);
            outline: none;
        }

        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #122A40;
            color: rgba(255,255,255,0.75);
            padding: 48px 0 28px;
            font-size: 0.84rem;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }

        .site-footer .footer-brand {
            font-family: var(--font-serif);
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.04em;
        }

        .site-footer .footer-desc {
            font-size: 0.82rem;
            line-height: 1.75;
            color: rgba(255,255,255,0.6);
            margin-top: 8px;
            max-width: 300px;
        }

        .site-footer h4 {
            font-size: 0.88rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.04em;
        }

        .site-footer ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .site-footer ul li {
            margin-bottom: 8px;
        }

        .site-footer ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.82rem;
            transition: color var(--transition);
        }

        .site-footer ul li a:hover {
            color: #fff;
        }

        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.78rem;
            color: rgba(255,255,255,0.5);
        }

        .site-footer .footer-bottom a {
            color: rgba(255,255,255,0.6);
        }

        .site-footer .footer-bottom a:hover {
            color: #fff;
        }

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

            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --space-section: 52px;
                --space-section-mobile: 36px;
            }

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

            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding: 8px 0 12px;
                gap: 2px;
            }

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

            .main-nav a {
                padding: 10px 12px;
                border-radius: var(--radius-sm);
                width: 100%;
            }

            .mobile-menu-toggle {
                display: inline-flex;
                align-items: center;
                gap: 6px;
            }

            .hero {
                min-height: 480px;
            }

            .hero-content {
                padding: 48px 0 40px;
            }

            .countdown-bar {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }

            .stat-num {
                font-size: 1.8rem;
            }

            .compare-table {
                font-size: 0.78rem;
            }

            .compare-table th,
            .compare-table td {
                padding: 10px 12px;
                font-size: 0.75rem;
            }

            .form-card {
                padding: 24px 18px;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 6px;
            }
        }

        @media (max-width: 520px) {
            .container,
            .container-wide {
                padding: 0 16px;
            }

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

            .hero-actions {
                flex-direction: column;
                width: 100%;
            }

            .hero-actions .btn {
                width: 100%;
            }

            .countdown-timer {
                gap: 6px;
            }

            .cd-item {
                min-width: 44px;
                padding: 4px 8px;
            }

            .cd-item .cd-num {
                font-size: 1.2rem;
            }

            .card {
                padding: 20px;
            }

            .section-header .section-desc {
                font-size: 0.88rem;
            }
        }

/* roulang page: category2 */
:root {
      --primary: #1F4E79;
      --primary-dark: #163A5A;
      --primary-light: #2B5F84;
      --accent: #C9A961;
      --accent-soft: #E8D9B8;
      --bg: #F4F7FA;
      --bg-alt: #EAF1F7;
      --surface: #FFFFFF;
      --text: #1A2B3C;
      --text-secondary: #4A5E71;
      --text-muted: #7A8B9A;
      --border: #E3EAF0;
      --border-strong: #D0DCE6;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 999px;
      --shadow-card: 0 8px 24px rgba(30,50,70,0.06);
      --shadow-hover: 0 12px 36px rgba(30,50,70,0.11);
      --shadow-nav: 0 2px 12px rgba(30,50,70,0.05);
      --space-section: 52px;
      --space-section-mobile: 36px;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    body {
      font-family: var(--font-sans);
      font-size: 15px;
      line-height: 1.75;
      color: var(--text);
      background: var(--bg);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover,
    a:focus {
      color: var(--primary-dark);
      text-decoration: none;
    }
    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
      outline: 2px solid var(--primary-light);
      outline-offset: 2px;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .container-wide {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Header */
    .site-header {
      background: var(--surface);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: var(--shadow-nav);
    }
    .site-header .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 68px;
      gap: 16px;
      flex-wrap: wrap;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-serif);
      font-size: 1.55rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: 0.04em;
      white-space: nowrap;
      text-decoration: none;
    }
    .brand-logo .logo-mark {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      font-weight: 600;
      flex-shrink: 0;
    }
    .brand-logo .logo-sub {
      font-size: 0.55rem;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.12em;
      display: block;
      line-height: 1.2;
      margin-top: 2px;
      font-family: var(--font-sans);
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }
    .main-nav a {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: var(--radius-sm);
      transition: all var(--transition);
      white-space: nowrap;
      text-decoration: none;
    }
    .main-nav a:hover {
      color: var(--primary);
      background: var(--bg-alt);
    }
    .main-nav a.active {
      color: var(--primary-dark);
      background: var(--bg-alt);
      font-weight: 600;
      position: relative;
    }
    .main-nav a.active::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 16px;
      right: 16px;
      height: 2px;
      background: var(--accent);
      border-radius: 1px;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      padding: 8px 14px;
      font-size: 1.2rem;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all var(--transition);
    }
    .mobile-menu-toggle:hover {
      background: var(--bg-alt);
      color: var(--primary);
    }

    /* Sections */
    .section {
      padding: var(--space-section) 0;
    }
    .section-alt {
      background: var(--bg-alt);
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 12px;
      letter-spacing: 0.02em;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.8;
    }

    /* Breadcrumb */
    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      flex-wrap: wrap;
    }
    .breadcrumb a {
      color: var(--text-muted);
      text-decoration: none;
    }
    .breadcrumb a:hover {
      color: var(--primary);
    }
    .breadcrumb .separator {
      color: var(--border-strong);
    }
    .breadcrumb .current {
      color: var(--primary-dark);
      font-weight: 500;
    }

    /* Page heading */
    .page-heading {
      margin-bottom: 32px;
    }
    .page-heading h1 {
      font-family: var(--font-serif);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
    }
    .page-heading p {
      font-size: 1.1rem;
      color: var(--text-secondary);
      line-height: 1.9;
      max-width: 900px;
    }

    /* Brand cards */
    .brand-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .brand-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .brand-card .card-image {
      position: relative;
      background: #eef2f6;
      height: 200px;
      overflow: hidden;
    }
    .brand-card .card-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .brand-card .card-image .badge {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(255,255,255,0.92);
      color: var(--primary-dark);
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 999px;
      font-weight: 600;
      letter-spacing: 0.02em;
      backdrop-filter: blur(4px);
      border: 1px solid var(--border);
    }
    .brand-card .card-body {
      padding: 20px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .brand-card .card-body h3 {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 8px;
      font-family: var(--font-serif);
    }
    .brand-card .card-body p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.8;
      flex: 1;
      margin-bottom: 16px;
    }
    .brand-card .card-footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .brand-card .card-footer .category {
      background: var(--bg-alt);
      padding: 3px 10px;
      border-radius: 999px;
      font-weight: 500;
    }

    /* Data summary */
    .data-summary-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .data-item {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .data-item .number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-dark);
      font-family: var(--font-serif);
      line-height: 1.2;
    }
    .data-item .label {
      font-size: 0.95rem;
      color: var(--text-secondary);
      margin-top: 8px;
    }

    /* Topic entry cards */
    .topic-entry-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .topic-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      align-items: flex-start;
      gap: 20px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .topic-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .topic-card .icon-box {
      width: 52px;
      height: 52px;
      background: var(--bg-alt);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .topic-card .icon-box i {
      font-size: 1.5rem;
      color: var(--primary);
    }
    .topic-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 8px;
      font-family: var(--font-serif);
    }
    .topic-card p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.8;
      margin-bottom: 16px;
    }

    /* Quick answers */
    .quick-answer-item {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
    }
    .quick-answer-item h4 {
      font-size: 1rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .quick-answer-item h4 i {
      color: var(--accent);
      font-size: 1rem;
    }
    .quick-answer-item p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.8;
      margin: 0;
    }

    /* FAQ */
    .faq-section .accordion {
      background: none;
      border: none;
      border-radius: 0;
    }
    .faq-section .accordion-item {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .faq-section .accordion-title {
      background: transparent;
      border: none;
      font-family: var(--font-sans);
      font-size: 1rem;
      font-weight: 600;
      color: var(--text);
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      transition: background var(--transition);
    }
    .faq-section .accordion-title:hover {
      background: var(--bg-alt);
    }
    .faq-section .accordion-title .fa-chevron-down {
      transition: transform var(--transition);
      font-size: 0.9rem;
      color: var(--primary);
    }
    .faq-section .accordion-title[aria-expanded="true"] .fa-chevron-down {
      transform: rotate(180deg);
    }
    .faq-section .accordion-content {
      border-top: 1px solid var(--border);
      background: var(--surface);
      padding: 18px 24px;
      color: var(--text-secondary);
      line-height: 1.9;
    }
    .faq-section .accordion-content p {
      margin: 0;
    }

    /* Subscribe form */
    .form-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-card);
    }
    .form-card h3 {
      font-family: var(--font-serif);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 12px;
    }
    .form-card p {
      color: var(--text-secondary);
      margin-bottom: 24px;
    }
    .form-card input[type="text"],
    .form-card input[type="email"],
    .form-card select {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      font-size: 0.95rem;
      color: var(--text);
      width: 100%;
      margin-bottom: 16px;
      transition: border-color var(--transition), box-shadow var(--transition);
    }
    .form-card input:focus,
    .form-card select:focus {
      border-color: var(--primary-light);
      box-shadow: 0 0 0 3px rgba(47, 95, 132, 0.1);
      outline: none;
    }
    .form-card label {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      margin-bottom: 6px;
      display: block;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      border: 2px solid transparent;
      letter-spacing: 0.02em;
      text-decoration: none;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }
    .btn-primary:hover,
    .btn-primary:focus {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      color: #fff;
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(31,78,121,0.18);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover,
    .btn-outline:focus {
      background: var(--bg-alt);
      color: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: translateY(-1px);
    }
    .btn-block {
      width: 100%;
      display: flex;
    }

    /* Footer */
    .site-footer {
      background: var(--primary-dark);
      color: #fff;
      padding: 48px 0 24px;
      margin-top: 64px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-brand {
      font-family: var(--font-serif);
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #fff;
    }
    .footer-desc {
      color: rgba(255,255,255,0.75);
      font-size: 0.9rem;
      line-height: 1.8;
      max-width: 320px;
    }
    .site-footer h4 {
      color: #fff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: 0.02em;
    }
    .site-footer ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .site-footer ul li {
      margin-bottom: 8px;
    }
    .site-footer ul li a {
      color: rgba(255,255,255,0.75);
      text-decoration: none;
      transition: color var(--transition);
      font-size: 0.9rem;
    }
    .site-footer ul li a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8rem;
      color: rgba(255,255,255,0.65);
    }
    .footer-bottom a {
      color: rgba(255,255,255,0.65);
      text-decoration: none;
    }
    .footer-bottom a:hover {
      color: var(--accent);
    }

    /* Responsive */
    @media screen and (max-width: 1024px) {
      .data-summary-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .brand-card .card-image {
        height: 180px;
      }
    }
    @media screen and (max-width: 768px) {
      .header-inner {
        flex-wrap: nowrap;
      }
      .main-nav {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--surface);
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-nav);
        gap: 0;
      }
      .main-nav.open {
        display: flex;
      }
      .main-nav a {
        display: block;
        padding: 12px 16px;
        border-bottom: 1px solid var(--bg-alt);
      }
      .main-nav a:last-child {
        border-bottom: none;
      }
      .mobile-menu-toggle {
        display: inline-block;
      }
      .topic-entry-grid {
        grid-template-columns: 1fr;
      }
      .data-summary-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .page-heading h1 {
        font-size: 2rem;
      }
      .section {
        padding: var(--space-section-mobile) 0;
      }
      .form-card {
        padding: 24px;
      }
    }
    @media screen and (max-width: 520px) {
      .brand-card .card-image {
        height: 160px;
      }
      .topic-card {
        padding: 20px;
        flex-direction: column;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
      }
    }

/* roulang page: category1 */
:root {
            --primary: #1F4E79;
            --primary-dark: #163A5A;
            --primary-light: #2B5F84;
            --accent: #C9A961;
            --accent-soft: #E8D9B8;
            --bg: #F4F7FA;
            --bg-alt: #EAF1F7;
            --surface: #FFFFFF;
            --text: #1A2B3C;
            --text-secondary: #4A5E71;
            --text-muted: #7A8B9A;
            --border: #E3EAF0;
            --border-strong: #D0DCE6;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-pill: 999px;
            --shadow-card: 0 8px 24px rgba(30, 50, 70, 0.06);
            --shadow-hover: 0 12px 36px rgba(30, 50, 70, 0.11);
            --shadow-nav: 0 2px 12px rgba(30, 50, 70, 0.05);
            --space-section: 72px;
            --space-section-mobile: 44px;
            --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background: var(--bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus {
            color: var(--primary-dark);
            text-decoration: none;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-wide {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        /* ========== TOP HEADER ========== */
        .site-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-nav);
        }
        .site-header .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
            flex-wrap: wrap;
            padding: 8px 0;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.04em;
            white-space: nowrap;
        }
        .brand-logo .logo-mark {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 600;
            flex-shrink: 0;
        }
        .brand-logo .logo-sub {
            font-size: 0.55rem;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 0.12em;
            display: block;
            line-height: 1.2;
            margin-top: 2px;
            font-family: var(--font-sans);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--bg-alt);
        }
        .main-nav a.active {
            color: var(--primary-dark);
            background: var(--bg-alt);
            font-weight: 600;
            position: relative;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            font-size: 1.2rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition);
        }
        .mobile-menu-toggle:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }
        /* ========== PAGE HEADER (分类页紧凑头部) ========== */
        .page-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            padding: 48px 0 40px;
            position: relative;
            overflow: hidden;
        }
        .page-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 16px;
            list-style: none;
            padding: 0;
        }
        .breadcrumb li {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .breadcrumb li+li::before {
            content: '/';
            color: var(--border-strong);
            font-size: 0.8rem;
            margin-right: 2px;
        }
        .breadcrumb a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 500;
        }
        .page-header h1 {
            font-family: var(--font-serif);
            font-size: 2.35rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 12px;
            letter-spacing: 0.02em;
            line-height: 1.3;
        }
        .page-header .page-subtitle {
            font-size: 1.02rem;
            color: var(--text-secondary);
            max-width: 720px;
            margin: 0;
            line-height: 1.8;
        }
        /* ========== SECTION COMMON ========== */
        .section {
            padding: var(--space-section) 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-white {
            background: var(--surface);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .section-title {
            font-family: var(--font-serif);
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 8px;
            letter-spacing: 0.01em;
            line-height: 1.35;
        }
        .section-lead {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 0 32px;
            line-height: 1.8;
        }
        .section-head {
            margin-bottom: 36px;
        }
        .section-head .section-title {
            margin-bottom: 10px;
        }
        /* ========== CARDS ========== */
        .card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }
        .card-media {
            background: var(--bg-alt);
            aspect-ratio: 16 / 9;
            overflow: hidden;
            position: relative;
        }
        .card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-media img {
            transform: scale(1.04);
        }
        .card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-tag {
            display: inline-block;
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--primary);
            background: var(--bg-alt);
            border-radius: var(--radius-pill);
            padding: 3px 12px;
            letter-spacing: 0.06em;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .card-title {
            font-family: var(--font-serif);
            font-size: 1.12rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 8px;
            line-height: 1.5;
        }
        .card-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin: 0 0 14px;
            line-height: 1.75;
            flex: 1;
        }
        .card-meta {
            font-size: 0.78rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--border);
        }
        .card-meta i {
            color: var(--accent);
            margin-right: 4px;
        }
        .card-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: color var(--transition), gap var(--transition);
        }
        .card-link:hover {
            color: var(--primary-dark);
            gap: 8px;
        }
        /* ========== ARTICLE GRID ========== */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        /* ========== STATS / DATA ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            text-align: center;
            transition: all var(--transition);
        }
        .stat-item:hover {
            border-color: var(--accent-soft);
            box-shadow: var(--shadow-card);
        }
        .stat-number {
            font-family: var(--font-serif);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-number .unit {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            margin-left: 2px;
        }
        .stat-label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin: 0;
        }
        .stat-source {
            font-size: 0.72rem;
            color: var(--text-muted);
            margin: 8px 0 0;
            letter-spacing: 0.04em;
        }
        /* ========== CHIP / TAG ========== */
        .chip-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .chip {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--surface);
            border: 1px solid var(--border-strong);
            border-radius: var(--radius-pill);
            transition: all var(--transition);
            cursor: pointer;
            white-space: nowrap;
        }
        .chip:hover {
            color: var(--primary);
            border-color: var(--primary-light);
            background: var(--bg-alt);
        }
        .chip.active {
            color: #fff;
            background: var(--primary);
            border-color: var(--primary);
            font-weight: 600;
        }
        /* ========== BUTTON ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 26px;
            font-size: 0.9rem;
            font-weight: 600;
            font-family: var(--font-sans);
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            cursor: pointer;
            transition: all var(--transition);
            text-align: center;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(31, 78, 121, 0.25);
        }
        .btn-outline {
            background: var(--surface);
            color: var(--primary);
            border-color: var(--border-strong);
        }
        .btn-outline:hover {
            background: var(--bg-alt);
            border-color: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: #b8954e;
            border-color: #b8954e;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(201, 169, 97, 0.3);
        }
        /* ========== FORM ========== */
        .form-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 32px;
        }
        .form-card .form-title {
            font-family: var(--font-serif);
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 8px;
        }
        .form-card .form-desc {
            font-size: 0.92rem;
            color: var(--text-secondary);
            margin: 0 0 24px;
            line-height: 1.7;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 6px;
        }
        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 11px 14px;
            font-size: 0.9rem;
            font-family: var(--font-sans);
            color: var(--text);
            background: var(--bg);
            border: 1px solid var(--border-strong);
            border-radius: var(--radius-sm);
            transition: border-color var(--transition), box-shadow var(--transition);
            appearance: none;
        }
        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(31, 78, 121, 0.08);
            outline: none;
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .form-footer {
            margin-top: 20px;
        }
        .form-footer .btn {
            width: 100%;
        }
        .form-note {
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: 12px;
            text-align: center;
        }
        /* ========== FAQ / ACCORDION ========== */
        .accordion {
            margin: 0;
            list-style: none;
            padding: 0;
        }
        .accordion-item {
            margin-bottom: 12px;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            background: var(--surface);
            overflow: hidden;
            transition: box-shadow var(--transition), border-color var(--transition);
        }
        .accordion-item:hover {
            border-color: var(--border-strong);
        }
        .accordion-item.is-active {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-card);
        }
        .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 20px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            transition: color var(--transition);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: var(--font-sans);
        }
        .accordion-title:hover {
            color: var(--primary);
        }
        .accordion-title::after {
            content: '+';
            font-size: 1.2rem;
            font-weight: 400;
            color: var(--text-muted);
            transition: transform var(--transition), color var(--transition);
            flex-shrink: 0;
        }
        .is-active .accordion-title::after {
            content: '−';
            color: var(--primary);
            transform: rotate(180deg);
        }
        .accordion-content {
            padding: 0 20px 18px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }
        .is-active .accordion-content {
            display: block;
        }
        /* ========== INFO BLOCK ========== */
        .info-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .info-block .info-content h2 {
            font-family: var(--font-serif);
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 14px;
        }
        .info-block .info-content p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.85;
            margin: 0 0 12px;
        }
        .info-block .info-media {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
        }
        .info-block .info-media img {
            width: 100%;
            height: auto;
            object-fit: cover;
            aspect-ratio: 4 / 3;
        }
        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.86);
            padding: 52px 0 0;
            margin-top: 0;
            font-size: 0.88rem;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
        }
        .site-footer .footer-brand {
            font-family: var(--font-serif);
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.05em;
            margin-bottom: 10px;
        }
        .site-footer .footer-desc {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.68);
            line-height: 1.8;
            margin: 0;
            max-width: 340px;
        }
        .site-footer h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            margin: 0 0 14px;
            letter-spacing: 0.06em;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 8px;
        }
        .site-footer ul a {
            color: rgba(255, 255, 255, 0.68);
            font-size: 0.85rem;
            transition: color var(--transition);
        }
        .site-footer ul a:hover {
            color: var(--accent-soft);
        }
        .site-footer .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 14px;
            padding: 16px 0 20px;
            font-size: 0.78rem;
            color: rgba(255, 255, 255, 0.52);
        }
        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.68);
        }
        .site-footer .footer-bottom a:hover {
            color: var(--accent-soft);
        }
        /* ========== RESPONSIVE ========== */
        @media screen and (max-width: 1024px) {
            .article-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .info-block {
                gap: 28px;
            }
            :root {
                --space-section: 56px;
            }
        }
        @media screen and (max-width: 768px) {
            .site-header .header-inner {
                min-height: auto;
                padding: 10px 0;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                gap: 2px;
                padding-top: 8px;
                border-top: 1px solid var(--border);
            }
            .main-nav.is-open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 14px;
                font-size: 0.9rem;
            }
            .main-nav a.active::after {
                display: none;
            }
            .mobile-menu-toggle {
                display: inline-flex;
                align-items: center;
                gap: 6px;
            }
            .page-header {
                padding: 32px 0 28px;
            }
            .page-header h1 {
                font-size: 1.8rem;
            }
            .article-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-number {
                font-size: 1.7rem;
            }
            .info-block {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .form-row {
                grid-template-columns: 1fr;
                gap: 0;
            }
            .form-card {
                padding: 24px 20px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .breadcrumb {
                font-size: 0.78rem;
            }
            :root {
                --space-section: 44px;
                --space-section-mobile: 36px;
            }
        }
        @media screen and (max-width: 520px) {
            .container,
            .container-wide {
                padding: 0 16px;
            }
            .page-header h1 {
                font-size: 1.5rem;
            }
            .page-header .page-subtitle {
                font-size: 0.9rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            .stat-item {
                padding: 16px 14px;
            }
            .stat-number {
                font-size: 1.5rem;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .btn {
                padding: 10px 20px;
                font-size: 0.85rem;
            }
            .chip-list {
                gap: 8px;
            }
            .chip {
                padding: 6px 14px;
                font-size: 0.78rem;
            }
            .card-body {
                padding: 16px 16px 18px;
            }
            .section {
                padding: 36px 0;
            }
            .main-nav a {
                font-size: 0.85rem;
                padding: 9px 12px;
            }
        }

/* roulang page: category4 */
:root {
            --primary: #1F4E79;
            --primary-dark: #163A5A;
            --primary-light: #2B5F84;
            --accent: #C9A961;
            --accent-soft: #E8D9B8;
            --bg: #F4F7FA;
            --bg-alt: #EAF1F7;
            --surface: #FFFFFF;
            --text: #1A2B3C;
            --text-secondary: #4A5E71;
            --text-muted: #7A8B9A;
            --border: #E3EAF0;
            --border-strong: #D0DCE6;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-pill: 999px;
            --shadow-card: 0 8px 24px rgba(30, 50, 70, 0.06);
            --shadow-hover: 0 12px 36px rgba(30, 50, 70, 0.11);
            --shadow-nav: 0 2px 12px rgba(30, 50, 70, 0.05);
            --space-section: 72px;
            --space-section-mobile: 44px;
            --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        :root {
            --space-section: 52px;
            --space-section-mobile: 36px;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background: var(--bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover,
        a:focus {
            color: var(--primary-dark);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

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

        .container-wide {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== TOP BAR ========== */
        .site-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-nav);
        }

        .site-header .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
            flex-wrap: wrap;
            padding: 8px 0;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.04em;
            white-space: nowrap;
        }

        .brand-logo .logo-mark {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 600;
            flex-shrink: 0;
        }

        .brand-logo .logo-sub {
            font-size: 0.55rem;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 0.12em;
            display: block;
            line-height: 1.2;
            margin-top: 2px;
            font-family: var(--font-sans);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--bg-alt);
        }

        .main-nav a.active {
            color: var(--primary-dark);
            background: var(--bg-alt);
            font-weight: 600;
            position: relative;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            font-size: 1.2rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition);
        }

        .mobile-menu-toggle:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }

        /* ========== PAGE HEADER ========== */
        .page-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            padding: 32px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

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

        .breadcrumb a:hover {
            color: var(--primary-dark);
        }

        .breadcrumb .separator {
            color: var(--border-strong);
        }

        .breadcrumb .current {
            color: var(--primary-dark);
            font-weight: 500;
        }

        .page-header h1 {
            font-family: var(--font-serif);
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 12px;
            letter-spacing: 0.02em;
            line-height: 1.3;
        }

        .page-header .page-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 780px;
            margin: 0;
            line-height: 1.8;
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: var(--space-section) 0;
        }

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

        .section-title {
            font-family: var(--font-serif);
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 12px;
            letter-spacing: 0.02em;
            line-height: 1.35;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 780px;
            margin: 0 0 32px;
            line-height: 1.75;
        }

        /* ========== STATS / DATA ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .stat-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .stat-number {
            font-family: var(--font-serif);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary-dark);
            display: block;
            line-height: 1.2;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 8px;
            display: block;
        }

        .stat-source {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 4px;
            display: block;
            opacity: 0.8;
        }

        /* ========== ARTICLE CARDS ========== */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .article-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition);
            display: flex;
            flex-direction: column;
        }

        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .article-card .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            background: #E5EBF0;
        }

        .article-card .card-body {
            padding: 20px 20px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .article-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }

        .article-card .card-meta .tag {
            display: inline-block;
            background: var(--bg-alt);
            color: var(--primary);
            padding: 2px 10px;
            border-radius: var(--radius-pill);
            font-size: 0.75rem;
            font-weight: 500;
        }

        .article-card h3 {
            font-family: var(--font-serif);
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 10px;
            line-height: 1.5;
        }

        .article-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0 0 16px;
            flex: 1;
        }

        .article-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--primary);
            transition: color var(--transition);
        }

        .article-card .card-link i {
            font-size: 0.8rem;
            transition: transform var(--transition);
        }

        .article-card .card-link:hover {
            color: var(--primary-dark);
        }

        .article-card .card-link:hover i {
            transform: translateX(4px);
        }

        /* ========== TOPIC ENTRY ========== */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .topic-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .topic-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .topic-card .topic-icon {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .topic-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 8px;
            line-height: 1.4;
        }

        .topic-card p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        /* ========== QUICK ANSWERS ========== */
        .quick-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .quick-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: flex-start;
            gap: 12px;
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .quick-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .quick-item .quick-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg-alt);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 0.95rem;
        }

        .quick-item .quick-content h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 4px;
            line-height: 1.4;
        }

        .quick-item .quick-content p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.6;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: background var(--transition);
            font-family: var(--font-sans);
        }

        .faq-question:hover {
            background: var(--bg-alt);
        }

        .faq-question .faq-icon {
            font-size: 0.8rem;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== FORM ========== */
        .form-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 36px 40px;
            box-shadow: var(--shadow-card);
            max-width: 680px;
            margin: 0 auto;
        }

        .form-card .form-title {
            font-family: var(--font-serif);
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 8px;
        }

        .form-card .form-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin: 0 0 24px;
            line-height: 1.6;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-bottom: 16px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-group label {
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text-secondary);
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            padding: 10px 14px;
            border: 1px solid var(--border-strong);
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-family: var(--font-sans);
            color: var(--text);
            background: var(--bg);
            transition: border-color var(--transition), background var(--transition);
            width: 100%;
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            border-color: var(--primary-light);
            background: var(--surface);
            outline: none;
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 600;
            font-family: var(--font-sans);
            cursor: pointer;
            border: none;
            transition: all var(--transition);
            text-decoration: none;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(30, 50, 70, 0.2);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
        }

        .btn-secondary:hover {
            background: var(--bg-alt);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-block {
            width: 100%;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--primary-dark);
            color: #fff;
            padding: 56px 0 28px;
            margin-top: 0;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 40px;
        }

        .site-footer .footer-brand {
            font-family: var(--font-serif);
            font-size: 1.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.04em;
        }

        .site-footer .footer-desc {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.7;
            max-width: 360px;
            margin: 0;
        }

        .site-footer h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent-soft);
            margin: 0 0 16px;
            letter-spacing: 0.06em;
            text-transform: uppercase;
        }

        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .site-footer ul li {
            margin-bottom: 8px;
        }

        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.75);
            font-size: 0.85rem;
            transition: color var(--transition);
        }

        .site-footer ul li a:hover {
            color: #fff;
        }

        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.6);
            justify-content: space-between;
            align-items: center;
        }

        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
            transition: color var(--transition);
        }

        .site-footer .footer-bottom a:hover {
            color: #fff;
        }

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

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

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

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

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

        @media (max-width: 768px) {
            .site-header .header-inner {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
                padding: 12px 0;
            }

            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                gap: 2px;
            }

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

            .main-nav a {
                width: 100%;
                padding: 10px 16px;
            }

            .mobile-menu-toggle {
                display: inline-flex;
                align-self: flex-end;
                margin-top: -52px;
            }

            .page-header h1 {
                font-size: 1.9rem;
            }

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

            .section-title {
                font-size: 1.5rem;
            }

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

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

            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }

            .form-card {
                padding: 24px 20px;
            }

            .form-row {
                grid-template-columns: 1fr;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .site-footer .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }

            .page-header h1 {
                font-size: 1.6rem;
            }

            .breadcrumb {
                font-size: 0.75rem;
                gap: 4px;
            }

            .article-card .card-body {
                padding: 16px;
            }
        }

/* roulang page: category3 */
:root {
      --primary: #1F4E79;
      --primary-dark: #163A5A;
      --primary-light: #2B5F84;
      --accent: #C9A961;
      --accent-soft: #E8D9B8;
      --bg: #F4F7FA;
      --bg-alt: #EAF1F7;
      --surface: #FFFFFF;
      --text: #1A2B3C;
      --text-secondary: #4A5E71;
      --text-muted: #7A8B9A;
      --border: #E3EAF0;
      --border-strong: #D0DCE6;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 999px;
      --shadow-card: 0 8px 24px rgba(30,50,70,0.06);
      --shadow-hover: 0 12px 36px rgba(30,50,70,0.11);
      --shadow-nav: 0 2px 12px rgba(30,50,70,0.05);
      --space-section: 72px;
      --space-section-mobile: 44px;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: var(--font-sans);
      font-size: 15px;
      line-height: 1.75;
      color: var(--text);
      background: var(--bg);
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

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

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

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition);
    }

    a:hover,
    a:focus {
      color: var(--primary-dark);
      text-decoration: none;
    }

    a:focus-visible,
    button:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
      outline: 2px solid var(--primary-light);
      outline-offset: 2px;
    }

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

    .container-wide {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ========== TOP BAR ========== */
    .site-header {
      background: var(--surface);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: var(--shadow-nav);
      min-height: 68px;
    }

    .site-header .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 68px;
      gap: 16px;
      flex-wrap: nowrap;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-serif);
      font-size: 1.55rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: 0.04em;
      white-space: nowrap;
    }

    .brand-logo .logo-mark {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      font-weight: 600;
      flex-shrink: 0;
    }

    .brand-logo .logo-sub {
      font-size: 0.55rem;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0.12em;
      display: block;
      line-height: 1.2;
      margin-top: 2px;
      font-family: var(--font-sans);
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 6px;
      flex-wrap: wrap;
    }

    .main-nav a {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: var(--radius-sm);
      transition: all var(--transition);
      white-space: nowrap;
    }

    .main-nav a:hover {
      color: var(--primary);
      background: var(--bg-alt);
    }

    .main-nav a.active {
      color: var(--primary-dark);
      background: var(--bg-alt);
      font-weight: 600;
      position: relative;
    }

    .main-nav a.active::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 16px;
      right: 16px;
      height: 2px;
      background: var(--accent);
      border-radius: 1px;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      padding: 8px 14px;
      font-size: 1.2rem;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all var(--transition);
    }

    .mobile-menu-toggle:hover {
      background: var(--bg-alt);
      color: var(--primary);
    }

    /* ========== SECTION BASE ========== */
    .section {
      padding: var(--space-section) 0;
    }

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

    .kicker {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--primary-light);
      margin-bottom: 10px;
    }

    .section-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      gap: 24px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }

    .section-header h2 {
      font-family: var(--font-serif);
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--text);
      margin: 0;
      line-height: 1.3;
    }

    .section-header p {
      max-width: 560px;
      margin: 0;
      color: var(--text-secondary);
      font-size: 0.95rem;
      line-height: 1.8;
    }

    .section-note {
      font-size: 0.85rem;
      color: var(--text-muted);
      white-space: nowrap;
    }

    /* ========== PAGE HEADER ========== */
    .breadcrumb {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

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

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

    .breadcrumb span {
      color: var(--text-muted);
    }

    .page-hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }

    .page-hero-content h1 {
      font-family: var(--font-serif);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin: 0 0 16px;
      line-height: 1.2;
    }

    .page-hero-content .lead {
      font-size: 1.05rem;
      color: var(--text-secondary);
      line-height: 1.9;
      margin: 0 0 28px;
      max-width: 560px;
    }

    .hero-kpis {
      display: flex;
      gap: 28px;
      flex-wrap: wrap;
    }

    .hero-kpis > div {
      min-width: 90px;
    }

    .hero-kpis strong {
      display: block;
      font-size: 1.8rem;
      font-family: var(--font-serif);
      color: var(--primary-dark);
      line-height: 1.2;
    }

    .hero-kpis span {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .page-hero-media {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      min-height: 360px;
    }

    .page-hero-media img {
      width: 100%;
      height: 100%;
      min-height: 360px;
      object-fit: cover;
      border-radius: var(--radius-lg);
    }

    .media-note {
      position: absolute;
      left: 24px;
      bottom: 22px;
      background: rgba(255,255,255,0.92);
      color: var(--primary-dark);
      padding: 6px 16px;
      border-radius: var(--radius-pill);
      font-size: 0.8rem;
      letter-spacing: 0.04em;
      box-shadow: 0 4px 12px rgba(20,40,60,0.12);
      backdrop-filter: blur(4px);
    }

    /* ========== GUIDE GRID ========== */
    .guide-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .guide-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 18px;
      align-items: flex-start;
      transition: all var(--transition);
    }

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

    .guide-icon {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--bg-alt);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      flex-shrink: 0;
    }

    .guide-card h3 {
      font-size: 1.1rem;
      font-family: var(--font-serif);
      font-weight: 700;
      color: var(--text);
      margin: 0 0 8px;
    }

    .guide-card p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin: 0;
      line-height: 1.75;
    }

    /* ========== ARTICLE CARDS ========== */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .article-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }

    .article-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .article-img {
      width: 100%;
      aspect-ratio: 16 / 10;
      object-fit: cover;
      background: var(--bg-alt);
    }

    .article-body {
      padding: 20px 20px 22px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .article-tag {
      display: inline-block;
      align-self: flex-start;
      background: var(--accent-soft);
      color: var(--primary-dark);
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      margin-bottom: 12px;
      letter-spacing: 0.04em;
    }

    .article-title {
      font-family: var(--font-serif);
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text);
      line-height: 1.45;
      margin: 0 0 10px;
    }

    .article-summary {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.8;
      margin: 0 0 16px;
      flex: 1;
    }

    .article-meta {
      font-size: 0.8rem;
      color: var(--text-muted);
      display: flex;
      gap: 16px;
      align-items: center;
    }

    .article-meta i {
      margin-right: 4px;
    }

    /* ========== METRICS ========== */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .metric-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-left: 3px solid var(--accent);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

    .metric-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }

    .metric-value {
      font-family: var(--font-serif);
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-dark);
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    .metric-source {
      display: block;
      margin-top: 10px;
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* ========== SCENARIO CARDS ========== */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .scenario-card {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      min-height: 260px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

    .scenario-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .scenario-card img {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 1;
    }

    .scenario-card::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(22,39,58,0.05) 0%, rgba(22,39,58,0.78) 100%);
      z-index: 2;
    }

    .scenario-overlay {
      position: absolute;
      left: 20px;
      right: 20px;
      bottom: 18px;
      z-index: 3;
      color: #fff;
    }

    .scenario-overlay h3 {
      font-family: var(--font-serif);
      font-size: 1.2rem;
      font-weight: 700;
      margin: 0 0 6px;
    }

    .scenario-overlay p {
      font-size: 0.85rem;
      margin: 0;
      opacity: 0.9;
      line-height: 1.6;
    }

    /* ========== FAQ ========== */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }

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

    .faq-item:hover {
      border-color: var(--border-strong);
    }

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 20px 22px;
      font-size: 1.02rem;
      font-weight: 600;
      color: var(--text);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      transition: color var(--transition);
      font-family: var(--font-sans);
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      margin-left: auto;
      transition: transform var(--transition);
      color: var(--primary);
      flex-shrink: 0;
    }

    .faq-item.open .faq-icon {
      transform: rotate(180deg);
    }

    .faq-answer {
      padding: 0 22px 20px;
      color: var(--text-secondary);
      line-height: 1.85;
      font-size: 0.95rem;
    }

    .faq-answer[hidden] {
      display: none;
    }

    /* ========== CTA ========== */
    .cta-card {
      background: var(--primary-dark);
      color: #fff;
      border-radius: var(--radius-lg);
      padding: 48px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      box-shadow: var(--shadow-hover);
    }

    .cta-card .kicker {
      color: var(--accent-soft);
    }

    .cta-text h2 {
      font-family: var(--font-serif);
      font-size: 1.9rem;
      font-weight: 700;
      color: #fff;
      margin: 0 0 14px;
      line-height: 1.3;
    }

    .cta-text p {
      color: rgba(255,255,255,0.78);
      margin: 0;
      font-size: 0.95rem;
      line-height: 1.85;
    }

    .cta-form {
      background: var(--surface);
      color: var(--text);
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: 0 12px 32px rgba(0,0,0,0.15);
    }

    .form-row {
      display: flex;
      gap: 16px;
      margin-bottom: 16px;
    }

    .form-row input,
    .form-row select {
      flex: 1;
      padding: 12px 16px;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #fff;
      color: var(--text);
      transition: border-color var(--transition), box-shadow var(--transition);
      width: 100%;
    }

    .form-row input::placeholder {
      color: var(--text-muted);
    }

    .form-row input:focus,
    .form-row select:focus {
      border-color: var(--primary-light);
      box-shadow: 0 0 0 3px rgba(31,78,121,0.08);
      outline: none;
    }

    .btn-primary {
      display: inline-block;
      width: 100%;
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 13px 24px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      letter-spacing: 0.03em;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(22,58,90,0.18);
    }

    .form-note {
      margin: 14px 0 0;
      font-size: 0.75rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* ========== FOOTER ========== */
    .site-footer {
      background: #152D42;
      color: rgba(255,255,255,0.8);
      padding: 48px 0 24px;
    }

    .site-footer a {
      color: rgba(255,255,255,0.78);
      transition: color var(--transition);
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer-brand {
      font-family: var(--font-serif);
      font-size: 1.4rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 12px;
    }

    .footer-desc {
      font-size: 0.85rem;
      line-height: 1.85;
      color: rgba(255,255,255,0.65);
      margin: 0;
    }

    .site-footer h4 {
      font-size: 0.95rem;
      color: #fff;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .site-footer ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .site-footer ul li {
      margin-bottom: 10px;
      font-size: 0.9rem;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px 24px;
      justify-content: space-between;
      font-size: 0.8rem;
      color: rgba(255,255,255,0.55);
    }

    .footer-bottom span {
      white-space: nowrap;
    }

    .footer-bottom a {
      color: rgba(255,255,255,0.55);
    }

    .footer-bottom a:hover {
      color: #fff;
    }

    /* ========== RESPONSIVE ========== */
    @media (max-width: 1024px) {
      .guide-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .article-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cta-card {
        grid-template-columns: 1fr;
        padding: 36px;
      }
    }

    @media (max-width: 820px) {
      .section {
        padding: var(--space-section-mobile) 0;
      }

      .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
      }

      .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 16px 24px;
        box-shadow: var(--shadow-hover);
        border-bottom: 1px solid var(--border);
      }

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

      .main-nav a {
        padding: 12px 16px;
        border-bottom: 1px solid var(--border);
        border-radius: 0;
      }

      .main-nav a:last-child {
        border-bottom: none;
      }

      .mobile-menu-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
      }

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

      .page-hero-media {
        min-height: 280px;
        order: -1;
      }

      .page-hero-media img {
        min-height: 280px;
      }

      .page-hero-content h1 {
        font-size: 2rem;
      }

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

    @media (max-width: 520px) {
      .container {
        padding: 0 18px;
      }

      .section {
        padding: 36px 0;
      }

      .section-header h2,
      .cta-text h2 {
        font-size: 1.5rem;
      }

      .guide-grid,
      .article-grid,
      .scenario-grid,
      .metrics-grid {
        grid-template-columns: 1fr;
      }

      .hero-kpis {
        gap: 18px;
      }

      .hero-kpis strong {
        font-size: 1.5rem;
      }

      .cta-card {
        padding: 24px;
        border-radius: var(--radius-md);
      }

      .cta-form {
        padding: 20px;
      }

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

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }

      .footer-bottom {
        flex-direction: column;
        gap: 8px;
      }
    }

/* roulang page: category5 */
:root {
            --primary: #1F4E79;
            --primary-dark: #163A5A;
            --primary-light: #2B5F84;
            --accent: #C9A961;
            --accent-soft: #E8D9B8;
            --bg: #F4F7FA;
            --bg-alt: #EAF1F7;
            --surface: #FFFFFF;
            --text: #1A2B3C;
            --text-secondary: #4A5E71;
            --text-muted: #7A8B9A;
            --border: #E3EAF0;
            --border-strong: #D0DCE6;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-pill: 999px;
            --shadow-card: 0 8px 24px rgba(30,50,70,0.06);
            --shadow-hover: 0 12px 36px rgba(30,50,70,0.11);
            --shadow-nav: 0 2px 12px rgba(30,50,70,0.05);
            --space-section: 52px;
            --space-section-mobile: 36px;
            --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 15px;
            line-height: 1.75;
            color: var(--text);
            background: var(--bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover,
        a:focus {
            color: var(--primary-dark);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

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

        .container-wide {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== TOP BAR ========== */
        .site-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-nav);
        }

        .site-header .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
            flex-wrap: wrap;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.04em;
            white-space: nowrap;
        }

        .brand-logo .logo-mark {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 600;
            flex-shrink: 0;
        }

        .brand-logo .logo-sub {
            font-size: 0.55rem;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 0.12em;
            display: block;
            line-height: 1.2;
            margin-top: 2px;
            font-family: var(--font-sans);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--bg-alt);
        }

        .main-nav a.active {
            color: var(--primary-dark);
            background: var(--bg-alt);
            font-weight: 600;
            position: relative;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            font-size: 1.2rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition);
        }

        .mobile-menu-toggle:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-wrap {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            padding: 14px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            flex-wrap: wrap;
            list-style: none;
            margin: 0;
            padding: 0;
        }

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

        .breadcrumb li a {
            color: var(--text-secondary);
            transition: color var(--transition);
        }

        .breadcrumb li a:hover {
            color: var(--primary);
        }

        .breadcrumb li:not(:last-child)::after {
            content: '/';
            color: var(--border-strong);
            margin-left: 4px;
        }

        .breadcrumb li:last-child {
            color: var(--primary-dark);
            font-weight: 500;
        }

        /* ========== CATEGORY HEADER ========== */
        .category-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            padding: 48px 0 40px;
            position: relative;
            overflow: hidden;
        }

        .category-header::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 280px;
            height: 100%;
            background: linear-gradient(to left, var(--bg-alt), transparent);
            pointer-events: none;
        }

        .category-header .cat-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: var(--radius-pill);
            font-size: 0.82rem;
            color: var(--primary);
            font-weight: 600;
            letter-spacing: 0.06em;
            margin-bottom: 16px;
        }

        .category-header .cat-label i {
            font-size: 0.75rem;
        }

        .category-header h1 {
            font-family: var(--font-serif);
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 14px;
            letter-spacing: 0.04em;
            line-height: 1.3;
        }

        .category-header .cat-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            line-height: 1.8;
            margin: 0;
        }

        /* ========== SECTION COMMON ========== */
        .section {
            padding: var(--space-section) 0;
        }

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

        .section-title {
            font-family: var(--font-serif);
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 12px;
            letter-spacing: 0.03em;
            line-height: 1.35;
        }

        .section-lead {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.85;
            margin: 0 0 32px;
        }

        .section-header-row {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 28px;
        }

        .section-header-row .section-title {
            margin: 0;
        }

        /* ========== CARDS ========== */
        .card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
        }

        .card:hover {
            box-shadow: var(--shadow-hover);
            border-color: var(--border-strong);
            transform: translateY(-3px);
        }

        .card-img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            background: var(--bg-alt);
        }

        .card-body {
            padding: 22px 24px 24px;
        }

        .card-tag {
            display: inline-block;
            padding: 4px 12px;
            font-size: 0.72rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            border-radius: var(--radius-pill);
            background: var(--accent-soft);
            color: var(--primary-dark);
            margin-bottom: 10px;
        }

        .card-title {
            font-family: var(--font-serif);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 10px;
            line-height: 1.5;
        }

        .card-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0 0 16px;
        }

        .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            padding-top: 14px;
        }

        .card-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .card-meta i {
            font-size: 0.75rem;
        }

        /* ========== BUTTONS ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            font-size: 0.9rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            cursor: pointer;
            transition: all var(--transition);
            font-family: var(--font-sans);
            letter-spacing: 0.02em;
            line-height: 1.4;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(30,50,70,0.15);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }

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

        .btn-sm {
            padding: 8px 18px;
            font-size: 0.82rem;
        }

        /* ========== CATEGORY INTRO ========== */
        .cat-intro {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 36px 40px;
            box-shadow: var(--shadow-card);
        }

        .cat-intro p {
            color: var(--text-secondary);
            line-height: 1.9;
            font-size: 1rem;
            margin: 0 0 16px;
        }

        .cat-intro p:last-child {
            margin-bottom: 0;
        }

        .cat-intro .highlight {
            color: var(--primary-dark);
            font-weight: 500;
            background: var(--bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
        }

        /* ========== ARCHIVE GRID ========== */
        .archive-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .archive-card .card-img {
            height: 200px;
            object-fit: cover;
        }

        .archive-card .card-body {
            padding: 20px 22px 22px;
        }

        .archive-card .card-title {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }

        .archive-card .card-text {
            font-size: 0.85rem;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .archive-card .card-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }

        .archive-card .card-link:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

        /* ========== DATA SUMMARY ========== */
        .data-summary {
            background: var(--primary-dark);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            color: #fff;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            position: relative;
            overflow: hidden;
        }

        .data-summary::after {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(201,169,97,0.1);
            pointer-events: none;
        }

        .data-item {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .data-item .data-num {
            font-family: var(--font-serif);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--accent-soft);
            line-height: 1.2;
        }

        .data-item .data-label {
            font-size: 0.85rem;
            color: rgba(255,255,255,0.75);
            letter-spacing: 0.04em;
        }

        .data-item .data-note {
            font-size: 0.72rem;
            color: rgba(255,255,255,0.5);
            margin-top: 2px;
        }

        /* ========== TOPIC ENTRY ========== */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .topic-card {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 26px 28px;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            gap: 10px;
            box-shadow: var(--shadow-card);
        }

        .topic-card:hover {
            box-shadow: var(--shadow-hover);
            border-color: var(--border-strong);
            transform: translateY(-3px);
        }

        .topic-card .topic-icon {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--primary);
            flex-shrink: 0;
        }

        .topic-card h3 {
            font-family: var(--font-serif);
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text);
            margin: 0;
            line-height: 1.4;
        }

        .topic-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0;
            flex-grow: 1;
        }

        .topic-card .topic-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }

        .topic-card .topic-link:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }

        .faq-item:hover {
            border-color: var(--border-strong);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 24px;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: var(--font-sans);
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            transition: all var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
            background: var(--bg-alt);
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: all var(--transition);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.8;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: var(--primary);
        }

        /* ========== SUBSCRIBE FORM ========== */
        .subscribe-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 40px 44px;
            box-shadow: var(--shadow-card);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .subscribe-info h3 {
            font-family: var(--font-serif);
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 10px;
            line-height: 1.4;
        }

        .subscribe-info p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin: 0;
        }

        .subscribe-form .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-bottom: 16px;
        }

        .subscribe-form input,
        .subscribe-form select {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-family: var(--font-sans);
            color: var(--text);
            background: var(--surface);
            transition: all var(--transition);
            box-sizing: border-box;
        }

        .subscribe-form input:focus,
        .subscribe-form select:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(31,78,121,0.08);
        }

        .subscribe-form input::placeholder {
            color: var(--text-muted);
        }

        .subscribe-form .btn {
            width: 100%;
            padding: 13px 24px;
            font-size: 0.92rem;
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.72);
            padding: 48px 0 28px;
            margin-top: 0;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }

        .site-footer .footer-brand {
            font-family: var(--font-serif);
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.04em;
            margin-bottom: 12px;
        }

        .site-footer .footer-desc {
            font-size: 0.85rem;
            line-height: 1.8;
            color: rgba(255,255,255,0.6);
            max-width: 340px;
            margin: 0;
        }

        .site-footer h4 {
            font-size: 0.85rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.06em;
            margin: 0 0 16px;
            text-transform: uppercase;
        }

        .site-footer ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .site-footer ul li {
            margin-bottom: 10px;
        }

        .site-footer ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.85rem;
            transition: color var(--transition);
        }

        .site-footer ul li a:hover {
            color: var(--accent-soft);
        }

        .site-footer .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            padding-top: 24px;
            font-size: 0.78rem;
            color: rgba(255,255,255,0.5);
        }

        .site-footer .footer-bottom a {
            color: rgba(255,255,255,0.6);
            font-size: 0.78rem;
            transition: color var(--transition);
        }

        .site-footer .footer-bottom a:hover {
            color: var(--accent-soft);
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .archive-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }

            .data-summary {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
                padding: 32px 28px;
            }

            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }

            .subscribe-card {
                grid-template-columns: 1fr;
                gap: 24px;
                padding: 32px 28px;
            }

            .category-header h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            .site-header .header-inner {
                min-height: 60px;
            }

            .brand-logo {
                font-size: 1.3rem;
            }

            .brand-logo .logo-mark {
                width: 34px;
                height: 34px;
                font-size: 0.95rem;
            }

            .mobile-menu-toggle {
                display: block;
            }

            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 2px;
                padding: 12px 0;
                background: var(--surface);
            }

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

            .main-nav a {
                padding: 10px 16px;
                width: 100%;
                border-radius: var(--radius-sm);
                font-size: 0.9rem;
            }

            .main-nav a.active::after {
                display: none;
            }

            .category-header {
                padding: 32px 0 28px;
            }

            .category-header h1 {
                font-size: 1.7rem;
            }

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

            .section-title {
                font-size: 1.45rem;
            }

            .archive-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .data-summary {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
                padding: 24px 20px;
            }

            .data-item .data-num {
                font-size: 1.7rem;
            }

            .topic-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }

            .cat-intro {
                padding: 24px 20px;
            }

            .subscribe-card {
                padding: 24px 20px;
            }

            .subscribe-form .form-row {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }

            .site-footer .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .container-wide {
                padding: 0 16px;
            }

            .category-header h1 {
                font-size: 1.45rem;
            }

            .category-header .cat-subtitle {
                font-size: 0.95rem;
            }

            .section-title {
                font-size: 1.3rem;
            }

            .data-summary {
                grid-template-columns: 1fr;
                gap: 16px;
                padding: 20px 16px;
            }

            .data-item .data-num {
                font-size: 1.5rem;
            }

            .archive-card .card-img {
                height: 170px;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .card-body {
                padding: 18px 18px 20px;
            }

            .section-header-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }

            .breadcrumb {
                font-size: 0.78rem;
            }
        }

/* roulang page: category6 */
:root {
            --primary: #1F4E79;
            --primary-dark: #163A5A;
            --primary-light: #2B5F84;
            --accent: #C9A961;
            --accent-soft: #E8D9B8;
            --bg: #F4F7FA;
            --bg-alt: #EAF1F7;
            --surface: #FFFFFF;
            --text: #1A2B3C;
            --text-secondary: #4A5E71;
            --text-muted: #7A8B9A;
            --border: #E3EAF0;
            --border-strong: #D0DCE6;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-pill: 999px;
            --shadow-card: 0 8px 24px rgba(30,50,70,0.06);
            --shadow-hover: 0 12px 36px rgba(30,50,70,0.11);
            --shadow-nav: 0 2px 12px rgba(30,50,70,0.05);
            --space-section: 64px;
            --space-section-mobile: 40px;
            --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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: 1.75;
            color: var(--text);
            background: var(--bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition), background var(--transition), box-shadow var(--transition);
        }

        a:hover,
        a:focus {
            color: var(--primary-dark);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

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

        .container-wide {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== TOP HEADER ========== */
        .site-header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow-nav);
        }

        .site-header .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 68px;
            gap: 16px;
            flex-wrap: wrap;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-serif);
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.04em;
            white-space: nowrap;
        }

        .brand-logo .logo-mark {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 600;
            flex-shrink: 0;
        }

        .brand-logo .logo-sub {
            font-size: 0.55rem;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 0.12em;
            display: block;
            line-height: 1.2;
            margin-top: 2px;
            font-family: var(--font-sans);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--bg-alt);
        }

        .main-nav a.active {
            color: var(--primary-dark);
            background: var(--bg-alt);
            font-weight: 600;
            position: relative;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            font-size: 1.2rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all var(--transition);
        }

        .mobile-menu-toggle:hover {
            background: var(--bg-alt);
            color: var(--primary);
        }

        /* ========== BREADCRUMB ========== */
        .breadcrumb-wrap {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            padding: 14px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            list-style: none;
            margin: 0;
            padding: 0;
        }

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

        .breadcrumb li + li::before {
            content: '›';
            color: var(--border-strong);
            font-size: 1rem;
            line-height: 1;
        }

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

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

        .breadcrumb .current {
            color: var(--primary-dark);
            font-weight: 600;
        }

        /* ========== PAGE HEADER ========== */
        .page-header {
            background: linear-gradient(180deg, var(--surface) 0%, var(--bg-alt) 100%);
            padding: 52px 0 44px;
            border-bottom: 1px solid var(--border);
        }

        .page-header .page-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
        }

        .page-header .page-label .line {
            width: 32px;
            height: 1px;
            background: var(--accent);
            display: inline-block;
        }

        .page-header h1 {
            font-family: var(--font-serif);
            font-size: 2.6rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 16px;
            letter-spacing: 0.06em;
            line-height: 1.3;
        }

        .page-header .page-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.8;
            margin: 0 0 20px;
        }

        .page-header .header-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .page-header .header-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .page-header .header-meta i {
            color: var(--primary-light);
            font-size: 0.9rem;
        }

        /* ========== SECTIONS ========== */
        .section {
            padding: var(--space-section) 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-white {
            background: var(--surface);
        }

        .section-title {
            font-family: var(--font-serif);
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 12px;
            letter-spacing: 0.03em;
            line-height: 1.4;
        }

        .section-lead {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.8;
            margin: 0 0 32px;
        }

        .section-sub {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent);
            letter-spacing: 0.06em;
            text-transform: uppercase;
            margin-bottom: 6px;
        }

        /* ========== CARDS ========== */
        .card {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 28px 26px;
            transition: all var(--transition);
            height: 100%;
        }

        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: var(--border-strong);
        }

        .card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            color: var(--primary);
            font-size: 1.4rem;
            flex-shrink: 0;
        }

        .card h3 {
            font-family: var(--font-serif);
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 10px;
            line-height: 1.45;
        }

        .card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0;
        }

        /* ========== TIER CARDS ========== */
        .tier-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 32px 28px;
            height: 100%;
            position: relative;
            overflow: hidden;
            transition: all var(--transition);
        }

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

        .tier-card.featured {
            border-top: 3px solid var(--accent);
            background: linear-gradient(180deg, #FDFBF7 0%, var(--surface) 40%);
        }

        .tier-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            color: var(--primary);
            background: var(--bg-alt);
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            margin-bottom: 14px;
        }

        .tier-card h3 {
            font-family: var(--font-serif);
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin: 0 0 8px;
            line-height: 1.35;
        }

        .tier-card .tier-desc {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0 0 20px;
        }

        .tier-card ul {
            list-style: none;
            margin: 0 0 24px;
            padding: 0;
        }

        .tier-card ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.65;
            padding: 6px 0;
            border-bottom: 1px solid var(--bg-alt);
        }

        .tier-card ul li:last-child {
            border-bottom: none;
        }

        .tier-card ul li i {
            color: var(--accent);
            font-size: 0.8rem;
            margin-top: 5px;
            flex-shrink: 0;
        }

        /* ========== STATS ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .stat-block {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 28px 24px;
            text-align: center;
            transition: all var(--transition);
        }

        .stat-block:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .stat-number {
            font-family: var(--font-serif);
            font-size: 2.4rem;
            font-weight: 700;
            color: var(--primary-dark);
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* ========== PERKS LIST ========== */
        .perks-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .perk-row {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 20px 22px;
            display: flex;
            align-items: flex-start;
            gap: 14px;
            transition: all var(--transition);
        }

        .perk-row:hover {
            border-color: var(--accent-soft);
            box-shadow: var(--shadow-card);
        }

        .perk-row .perk-icon {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .perk-row h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 6px;
            line-height: 1.4;
        }

        .perk-row p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0;
        }

        /* ========== SCENE CARDS ========== */
        .scene-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: all var(--transition);
            height: 100%;
        }

        .scene-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .scene-card .scene-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
        }

        .scene-card .scene-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .scene-card:hover .scene-img-wrap img {
            transform: scale(1.04);
        }

        .scene-card .scene-body {
            padding: 22px 24px;
        }

        .scene-card .scene-body h3 {
            font-family: var(--font-serif);
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text);
            margin: 0 0 8px;
        }

        .scene-card .scene-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin: 0 0 14px;
        }

        .scene-card .scene-tag {
            display: inline-flex;
            align-items: center;
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--accent);
            letter-spacing: 0.05em;
        }

        /* ========== FAQ ========== */
        .faq-item {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--border-strong);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: color var(--transition);
            font-family: var(--font-sans);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            color: var(--primary);
            transition: transform var(--transition);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }

        .faq-item.open .faq-answer {
            max-height: 500px;
        }

        .faq-answer-inner {
            padding: 0 22px 20px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        /* ========== FORM ========== */
        .form-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            padding: 36px 32px;
            max-width: 560px;
            margin: 0 auto;
        }

        .form-group {
            margin-bottom: 18px;
        }

        .form-group label {
            display: block;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 6px;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 12px 14px;
            font-size: 0.95rem;
            font-family: var(--font-sans);
            color: var(--text);
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            appearance: none;
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(31, 78, 121, 0.08);
            background: var(--surface);
        }

        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.95rem;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
            font-family: var(--font-sans);
            letter-spacing: 0.02em;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(31, 78, 121, 0.25);
        }

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

        .btn-outline:hover {
            background: var(--bg-alt);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: #152A3C;
            color: #B8C5D1;
            padding: 56px 0 0;
            margin-top: 0;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 36px;
        }

        .site-footer .footer-brand {
            font-family: var(--font-serif);
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }

        .site-footer .footer-desc {
            font-size: 0.9rem;
            line-height: 1.75;
            color: #9AACB8;
            max-width: 340px;
            margin: 0;
        }

        .site-footer h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin: 0 0 14px;
            letter-spacing: 0.04em;
        }

        .site-footer ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .site-footer ul li {
            margin-bottom: 8px;
        }

        .site-footer ul li a {
            color: #9AACB8;
            font-size: 0.9rem;
            transition: color var(--transition);
        }

        .site-footer ul li a:hover {
            color: var(--accent-soft);
        }

        .site-footer .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.82rem;
            color: #7A8B99;
        }

        .site-footer .footer-bottom span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .site-footer .footer-bottom a {
            color: #7A8B99;
        }

        .site-footer .footer-bottom a:hover {
            color: var(--accent-soft);
        }

        /* ========== RESPONSIVE ========== */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .site-header .header-inner {
                flex-wrap: nowrap;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                width: 100%;
                padding: 12px 0;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 16px;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .main-nav a.active::after {
                display: none;
            }
            .mobile-menu-toggle {
                display: inline-flex;
                align-items: center;
                justify-content: center;
                gap: 6px;
            }
            .page-header h1 {
                font-size: 2rem;
            }
            .section {
                padding: var(--space-section-mobile) 0;
            }
            .perks-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .form-card {
                padding: 28px 20px;
            }
        }

        @media (max-width: 520px) {
            .container,
            .container-wide {
                padding: 0 16px;
            }
            .page-header {
                padding: 36px 0 32px;
            }
            .page-header h1 {
                font-size: 1.7rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .tier-card,
            .card {
                padding: 22px 18px;
            }
        }