/* roulang page: index */
:root {
            --brand: #0f172a;
            --brand-light: #1e293b;
            --brand-dark: #020617;
            --accent: #f97316;
            --accent-light: #fb923c;
            --accent-dark: #ea580c;
            --text: #0f172a;
            --text-light: #64748b;
            --bg: #f8fafc;
            --border: #e2e8f0;
            --radius: 1rem;
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 20px 45px rgba(0, 0, 0, 0.12);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: #f8fafc;
            color: #0f172a;
            line-height: 1.7;
        }
        img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            font: inherit;
        }
        .section-padding {
            padding: 5rem 0;
        }
        .main-nav .nav-link {
            position: relative;
            padding: 0.35rem 0;
            font-weight: 500;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            transition: color 0.3s ease;
        }
        .main-nav .nav-link:hover {
            color: #fff;
        }
        .main-nav .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 4px;
            transition: width 0.3s ease;
        }
        .main-nav .nav-link:hover::after,
        .main-nav .nav-link.active::after {
            width: 100%;
        }
        .main-nav .nav-link.active {
            color: var(--accent);
            font-weight: 600;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.75rem;
            border-radius: 999px;
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.5;
            transition: all 0.3s ease;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(249, 115, 22, 0.3);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(249, 115, 22, 0.4);
        }
        .btn-outline {
            border: 1px solid rgba(255, 255, 255, 0.4);
            color: #fff;
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(4px);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: #fff;
            transform: translateY(-2px);
        }
        .card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: all 0.35s ease;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(249, 115, 22, 0.2);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 0.3rem 0.9rem;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            background: rgba(249, 115, 22, 0.1);
            color: var(--accent);
        }
        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 0.75rem;
            transition: box-shadow 0.3s ease, border-color 0.3s ease;
        }
        .faq-item:hover {
            border-color: rgba(249, 115, 22, 0.3);
        }
        .faq-item[open] {
            box-shadow: var(--shadow);
            border-color: rgba(249, 115, 22, 0.25);
        }
        .faq-item summary {
            cursor: pointer;
            padding: 1.1rem 1.25rem;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            position: relative;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '+';
            font-size: 1.35rem;
            font-weight: 400;
            color: var(--accent);
            flex-shrink: 0;
            line-height: 1;
            transition: transform 0.3s ease;
        }
        .faq-item[open] summary::after {
            transform: rotate(45deg);
        }
        .faq-item .faq-content {
            padding: 0 1.25rem 1.25rem;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .bottom-tab-nav {
            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
        }
        a:focus-visible,
        button:focus-visible,
        summary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 3rem 0;
            }
        }
        @media (max-width: 520px) {
            .section-padding {
                padding: 2.5rem 0;
            }
        }

/* roulang page: category1 */
:root {
            --brand: #0f172a;
            --brand-dark: #0b1120;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --border: #e2e8f0;
            --bg-soft: #f8fafc;
            --radius: 14px;
            --radius-lg: 22px;
            --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.09);
            --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.14);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.75;
            color: var(--text-main);
            background: #fff;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

        .main-nav .nav-link {
            position: relative;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.8);
            transition: color 0.25s ease;
            padding: 6px 2px;
        }

        .main-nav .nav-link:hover {
            color: #fff;
        }

        .main-nav .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            border-radius: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }

        .main-nav .nav-link:hover::after,
        .main-nav .nav-link.active::after {
            width: 100%;
        }

        .main-nav .nav-link.active {
            color: #fff;
            font-weight: 600;
        }

        .cat-banner {
            position: relative;
            min-height: 360px;
            display: flex;
            align-items: center;
            overflow: hidden;
            isolation: isolate;
        }

        .cat-banner .banner-bg {
            position: absolute;
            inset: 0;
            z-index: -2;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        .cat-banner .banner-overlay {
            position: absolute;
            inset: 0;
            z-index: -1;
            background: linear-gradient(120deg, rgba(15, 23, 42, 0.96) 0%, rgba(15, 23, 42, 0.82) 50%, rgba(15, 23, 42, 0.35) 100%);
        }

        .cat-banner .banner-tag {
            display: inline-block;
            padding: 6px 18px;
            background: rgba(245, 158, 11, 0.15);
            border: 1px solid rgba(245, 158, 11, 0.4);
            border-radius: 999px;
            font-size: 13px;
            font-weight: 500;
            color: var(--accent-light);
            letter-spacing: 0.5px;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(245, 158, 11, 0.12);
            border-left: 3px solid var(--accent);
            border-radius: 0 8px 8px 0;
            font-size: 13px;
            font-weight: 600;
            color: #b45309;
            letter-spacing: 0.5px;
        }

        .data-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 30px 26px;
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
            height: 100%;
        }

        .data-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-md);
            border-color: rgba(245, 158, 11, 0.35);
        }

        .data-card .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: #fff;
            background: linear-gradient(135deg, var(--brand), #1e3a5f);
            margin-bottom: 20px;
            transition: transform 0.3s ease;
        }

        .data-card:hover .card-icon {
            transform: rotate(-6deg) scale(1.05);
        }

        .article-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }

        .article-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }

        .article-card .article-thumb img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .article-card:hover .article-thumb img {
            transform: scale(1.04);
        }

        .article-card .article-body {
            padding: 24px 22px 26px;
        }

        .badge {
            display: inline-block;
            padding: 3px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(245, 158, 11, 0.12);
            color: #b45309;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 13px 30px;
            background: var(--accent);
            color: var(--brand);
            font-weight: 700;
            font-size: 15px;
            border-radius: 999px;
            transition: all 0.3s ease;
            border: 2px solid var(--accent);
        }

        .btn-primary:hover {
            background: var(--accent-light);
            border-color: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(245, 158, 11, 0.4);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(245, 158, 11, 0.5);
            outline-offset: 2px;
        }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 13px 30px;
            border: 2px solid rgba(255, 255, 255, 0.5);
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            border-radius: 999px;
            transition: all 0.3s ease;
            background: transparent;
        }

        .btn-outline-light:hover {
            background: #fff;
            color: var(--brand);
            border-color: #fff;
            transform: translateY(-2px);
        }

        .btn-outline-light:focus-visible {
            outline: 3px solid rgba(255, 255, 255, 0.4);
            outline-offset: 2px;
        }

        .workflow-section {
            position: relative;
            overflow: hidden;
        }

        .workflow-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(245, 158, 11, 0.08);
            pointer-events: none;
        }

        .workflow-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            position: relative;
            z-index: 1;
        }

        .step-item {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius);
            padding: 30px 24px;
            text-align: center;
            transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
        }

        .step-item:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(245, 158, 11, 0.5);
            transform: translateY(-6px);
        }

        .step-num {
            width: 52px;
            height: 52px;
            margin: 0 auto 18px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--brand);
            font-size: 20px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
        }

        .step-item h3 {
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.7;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 14px;
            margin-bottom: 14px;
            overflow: hidden;
            transition: box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .faq-item:hover {
            border-color: rgba(245, 158, 11, 0.35);
            box-shadow: var(--shadow-sm);
        }

        .faq-item summary {
            padding: 20px 26px;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: var(--text-main);
            list-style: none;
            position: relative;
            padding-right: 56px;
            user-select: none;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary::after {
            content: '\f067';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            right: 22px;
            top: 50%;
            transform: translateY(-50%);
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: rgba(245, 158, 11, 0.12);
            color: #b45309;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            transition: transform 0.3s ease, background 0.3s ease;
        }

        .faq-item[open] summary::after {
            transform: translateY(-50%) rotate(45deg);
            background: var(--accent);
            color: #fff;
        }

        .faq-item .faq-body {
            padding: 0 26px 22px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.8;
        }

        .cta-section {
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, var(--accent) 0%, #fbbf24 100%);
        }

        .cta-section .cta-pattern {
            position: absolute;
            top: -40px;
            right: -40px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.15);
        }

        .cta-section .cta-pattern-2 {
            position: absolute;
            bottom: -60px;
            left: -20px;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.12);
        }

        .cta-section .cta-inner {
            position: relative;
            z-index: 2;
        }

        .bottom-tab-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            display: flex;
            background: rgba(255, 255, 255, 0.98);
            border-top: 1px solid var(--border);
            box-shadow: 0 -6px 24px rgba(15, 23, 42, 0.1);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }

        .tab-item {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 10px 4px 8px;
            font-size: 11px;
            font-weight: 500;
            color: var(--text-muted);
            gap: 4px;
            transition: color 0.25s ease;
        }

        .tab-item i {
            font-size: 18px;
            transition: transform 0.25s ease;
        }

        .tab-item:hover,
        .tab-item.active {
            color: var(--accent);
        }

        .tab-item.active {
            font-weight: 700;
        }

        .tab-item.active i {
            transform: translateY(-2px);
        }

        @media (min-width: 769px) {
            .bottom-tab-nav {
                display: none;
            }
        }

        @media (max-width: 1024px) {
            .workflow-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .cat-banner {
                min-height: 300px;
            }
        }

        @media (max-width: 640px) {
            .cat-banner {
                min-height: 280px;
            }
            .cat-banner h1 {
                font-size: 2rem;
            }
            .cat-banner p {
                font-size: 1rem;
            }
            .data-card {
                padding: 24px 20px;
            }
            .workflow-steps {
                grid-template-columns: 1fr;
            }
            .faq-item summary {
                padding: 16px 20px;
                font-size: 15px;
            }
            .btn-primary,
            .btn-outline-light {
                width: 100%;
                justify-content: center;
            }
            .article-card .article-thumb img {
                height: 170px;
            }
        }

        @media (max-width: 520px) {
            .section-tag {
                font-size: 12px;
            }
            .workflow-steps {
                grid-template-columns: 1fr;
            }
            .tab-item {
                font-size: 10px;
            }
        }

        .intro-image {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-lg);
            pointer-events: none;
        }

        .intro-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .intro-image:hover img {
            transform: scale(1.03);
        }

        .feature-list li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 12px;
            color: var(--text-main);
            font-size: 15px;
        }

        .feature-list li::before {
            content: '\f0d0';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 1px;
            color: var(--accent);
            font-size: 14px;
        }

        .footer-link:hover {
            color: var(--accent);
        }

/* roulang page: article */
:root {
            --brand: #0F1F3D;
            --brand-dark: #0A1630;
            --brand-light: #1A2F52;
            --accent: #F59E0B;
            --accent-light: #FBBF24;
            --accent-dark: #D97706;
            --bg-page: #F8FAFC;
            --text-main: #1E293B;
            --text-weak: #64748B;
            --border: #E2E8F0;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
            --transition: 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-page);
            color: var(--text-main);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(245, 158, 11, 0.5);
            outline-offset: 2px;
        }

        .main-nav .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.75);
            transition: color var(--transition);
            padding: 8px 0;
        }

        .main-nav .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width var(--transition);
            border-radius: 2px;
        }

        .main-nav .nav-link:hover {
            color: #ffffff;
        }

        .main-nav .nav-link:hover::after {
            width: 100%;
        }

        .main-nav .nav-link.active {
            color: #ffffff;
            font-weight: 600;
        }

        .main-nav .nav-link.active::after {
            width: 100%;
        }

        .page-hero {
            background: linear-gradient(135deg, rgba(10, 22, 48, 0.92), rgba(15, 31, 61, 0.82)), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            padding: 72px 0 56px;
            color: #ffffff;
            position: relative;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 16px;
        }

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

        .breadcrumb .sep {
            opacity: 0.5;
        }

        .article-card {
            background: #ffffff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            padding: 36px 40px;
            border: 1px solid rgba(226, 232, 240, 0.6);
        }

        @media (max-width: 768px) {
            .article-card {
                padding: 24px 20px;
            }
        }

        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 14px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 28px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            background: rgba(245, 158, 11, 0.1);
            color: #B45309;
            border: 1px solid rgba(245, 158, 11, 0.2);
        }

        .article-content {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-main);
        }

        .article-content p {
            margin-bottom: 20px;
        }

        .article-content h2 {
            font-size: 22px;
            font-weight: 700;
            margin: 32px 0 14px;
            color: var(--brand);
        }

        .article-content h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 28px 0 10px;
            color: var(--brand);
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 20px 22px;
        }

        .article-content li {
            margin-bottom: 10px;
        }

        .article-content img {
            border-radius: var(--radius);
            margin: 24px 0;
            max-width: 100%;
            height: auto;
            box-shadow: var(--shadow-card);
        }

        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: rgba(245, 158, 11, 0.08);
            padding: 14px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 24px 0;
            color: var(--text-weak);
            font-style: italic;
        }

        .side-card {
            background: #ffffff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            padding: 24px;
            border: 1px solid rgba(226, 232, 240, 0.5);
            margin-bottom: 20px;
        }

        .side-card .side-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--brand);
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid rgba(245, 158, 11, 0.2);
        }

        .guide-card {
            background: linear-gradient(135deg, #0F1F3D, #1A2F52), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            color: #fff;
            border-radius: var(--radius);
            padding: 28px;
            position: relative;
            overflow: hidden;
        }

        .guide-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 31, 61, 0.85), rgba(10, 22, 48, 0.7));
        }

        .guide-card>* {
            position: relative;
            z-index: 1;
        }

        .topic-card {
            background: #ffffff;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition);
            border: 1px solid rgba(226, 232, 240, 0.5);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .topic-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }

        .topic-card .topic-img {
            height: 180px;
            width: 100%;
            object-fit: cover;
            display: block;
        }

        .topic-card .topic-body {
            padding: 22px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .topic-card .topic-title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .topic-card .topic-desc {
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.65;
            flex: 1;
        }

        .cta-section {
            background: linear-gradient(135deg, rgba(10, 22, 48, 0.95), rgba(15, 31, 61, 0.88)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            color: #fff;
            padding: 64px 0;
        }

        .not-found-card {
            background: #ffffff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            padding: 48px 32px;
            text-align: center;
            border: 1px solid rgba(226, 232, 240, 0.5);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #0F1F3D;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: 999px;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            font-size: 15px;
        }

        .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(245, 158, 11, 0.25);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 2px solid rgba(255, 255, 255, 0.6);
            color: #fff;
            font-weight: 600;
            padding: 10px 24px;
            border-radius: 999px;
            transition: all var(--transition);
            background: transparent;
            cursor: pointer;
            font-size: 15px;
        }

        .btn-outline:hover {
            border-color: var(--accent);
            background: var(--accent);
            color: #0F1F3D;
        }

        .mobile-bottom-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(10px);
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: space-around;
            align-items: center;
            height: 60px;
            padding-bottom: env(safe-area-inset-bottom);
        }

        .mobile-bottom-nav a {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            font-size: 11px;
            color: var(--text-weak);
            gap: 4px;
            padding: 8px 16px;
            border-radius: 10px;
            transition: color var(--transition);
            font-weight: 500;
        }

        .mobile-bottom-nav a i {
            font-size: 18px;
        }

        .mobile-bottom-nav a.active {
            color: var(--accent);
        }

        @media (max-width: 767px) {
            body {
                padding-bottom: 60px;
            }
            .page-hero {
                padding: 48px 0 36px;
            }
        }

        @media (min-width: 768px) {
            .mobile-bottom-nav {
                display: none;
            }
        }

        .fade-up {
            animation: fadeUp 0.6s ease both;
        }

        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: 999px;
            background: #F1F5F9;
            color: var(--text-weak);
            font-size: 13px;
            font-weight: 500;
            transition: all var(--transition);
        }

        .chip:hover {
            background: rgba(245, 158, 11, 0.15);
            color: var(--accent-dark);
        }