/* roulang page: index */
:root {
            --brand: #1e5eff;
            --brand-dark: #1236ab;
            --brand-light: #e0edff;
            --accent: #ff6b35;
            --bg: #f8fafc;
            --text: #0f172a;
            --text-light: #64748b;
            --border: #e2e8f0;
            --radius: 1rem;
            --shadow: 0 6px 28px rgba(30, 94, 255, 0.08);
        }

        * {
            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: #fff;
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color .2s;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        input,
        textarea {
            font-family: inherit;
            outline: none;
        }

        .container-custom {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        .section-padding {
            padding-top: 4.5rem;
            padding-bottom: 4.5rem;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
            color: var(--text);
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-light);
            margin-top: 0.75rem;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            padding: 0.25rem 0.75rem;
            background: var(--brand-light);
            color: var(--brand-dark);
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 999px;
            letter-spacing: 0.02em;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--brand);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.75rem;
            transition: all .25s;
            box-shadow: 0 4px 14px rgba(30, 94, 255, 0.28);
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(30, 94, 255, 0.32);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(30, 94, 255, 0.25);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            border: 1.5px solid rgba(255, 255, 255, 0.55);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.7rem 1.4rem;
            border-radius: 0.75rem;
            transition: all .25s;
            backdrop-filter: blur(4px);
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.8);
            transform: translateY(-2px);
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.75rem;
            transition: all .25s;
            box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
        }

        .btn-accent:hover {
            background: #e55221;
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(255, 107, 53, 0.32);
        }

        /* 导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: 0 1px 8px rgba(15, 23, 42, 0.04);
        }

        .nav-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: #475569;
            padding: 0.4rem 0.9rem;
            border-radius: 0.5rem;
            transition: all .2s;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--brand);
            background: rgba(30, 94, 255, 0.06);
        }

        .nav-link.active {
            color: var(--brand);
            background: rgba(30, 94, 255, 0.1);
            font-weight: 600;
        }

        .search-input {
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 0.45rem 1rem 0.45rem 2.4rem;
            font-size: 0.87rem;
            width: 200px;
            background-color: #f8fafc;
            transition: all .25s;
        }

        .search-input:focus {
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(30, 94, 255, 0.12);
            background-color: #fff;
            width: 240px;
        }

        .search-icon {
            position: absolute;
            left: 0.9rem;
            top: 50%;
            transform: translateY(-50%);
            color: #94a3b8;
            font-size: 0.85rem;
            pointer-events: none;
        }

        /* Hero */
        .hero-overlay {
            background: linear-gradient(105deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 94, 255, 0.45) 65%, rgba(15, 23, 42, 0.15) 100%);
        }

        /* 卡片 */
        .feature-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 1.5rem;
            transition: all .3s;
            box-shadow: var(--shadow);
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 16px 40px rgba(15, 23, 42, 0.1);
            border-color: rgba(30, 94, 255, 0.25);
        }

        .stat-card {
            text-align: center;
            padding: 1.6rem 1rem;
            border-radius: var(--radius);
            background: #fff;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: transform .25s;
        }

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

        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--brand);
        }

        /* 分类卡片 */
        .category-card {
            position: relative;
            border-radius: 1.1rem;
            overflow: hidden;
            background: #0f172a;
            min-height: 220px;
            display: flex;
            align-items: flex-end;
            transition: all .35s;
            box-shadow: 0 4px 16px rgba(15, 23, 42, 0.1);
        }

        .category-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 16px 40px rgba(15, 23, 42, 0.18);
        }

        .category-card img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.75;
            transition: all .5s;
        }

        .category-card:hover img {
            opacity: 0.5;
            transform: scale(1.04);
        }

        .category-card-content {
            position: relative;
            padding: 1.5rem;
            background: linear-gradient(180deg, transparent, rgba(15, 23, 42, 0.85));
            width: 100%;
            color: #fff;
        }

        .category-card-content h3 {
            font-size: 1.1rem;
            font-weight: 700;
        }

        .category-card-content p {
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.75);
            margin-top: 0.25rem;
        }

        /* 资讯卡片 */
        .post-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 1.4rem;
            transition: all .3s;
            display: block;
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
        }

        .post-card:hover {
            box-shadow: var(--shadow);
            border-color: rgba(30, 94, 255, 0.25);
            transform: translateY(-4px);
        }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--border);
            border-radius: 0.75rem;
            background: #fff;
            transition: all .25s;
        }

        .faq-item:hover {
            border-color: rgba(30, 94, 255, 0.3);
            box-shadow: 0 4px 16px rgba(15, 23, 42, 0.05);
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 1.25rem;
            font-weight: 600;
            font-size: 0.95rem;
            width: 100%;
            text-align: left;
            color: var(--text);
        }

        .faq-answer {
            padding: 0 1.25rem 1.1rem;
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.75;
        }

        /* 页脚 */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
        }

        .site-footer a {
            color: #94a3b8;
            transition: color .2s;
        }

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

        .footer-logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
        }

        /* 移动端导航 */
        .mobile-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
            padding: 1rem 1.25rem;
            flex-direction: column;
            gap: 0.25rem;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu .nav-link {
            padding: 0.7rem 0.9rem;
            border-radius: 0.5rem;
        }

        .mobile-menu .nav-link:hover {
            background: rgba(30, 94, 255, 0.06);
        }

        /* 用户评价 */
        .quote-card {
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 1rem;
            padding: 1.6rem;
            backdrop-filter: blur(6px);
            transition: background .3s;
        }

        .quote-card:hover {
            background: rgba(255, 255, 255, 0.11);
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(120deg, #1445d6 0%, #1e5eff 55%, #4da0ff 100%);
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .desktop-nav {
                display: none !important;
            }
            .mobile-toggle {
                display: flex !important;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .container-custom {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }

        @media (min-width: 1025px) {
            .mobile-toggle {
                display: none !important;
            }
            .desktop-nav {
                display: flex !important;
            }
        }

        @media (max-width: 640px) {
            .section-padding {
                padding-top: 3rem;
                padding-bottom: 3rem;
            }
            .stat-number {
                font-size: 1.8rem;
            }
        }

        /* 焦点可见性 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
        }

/* roulang page: category1 */
:root {
            --brand-50: #f0f9ff;
            --brand-100: #e0f2fe;
            --brand-200: #bae6fd;
            --brand-300: #7dd3fc;
            --brand-400: #38bdf8;
            --brand-500: #0ea5e9;
            --brand-600: #0284c7;
            --brand-700: #0369a1;
            --brand-800: #075985;
            --brand-900: #0c4a6e;
            --slate-50: #f8fafc;
            --slate-100: #f1f5f9;
            --slate-200: #e2e8f0;
            --slate-300: #cbd5e1;
            --slate-400: #94a3b8;
            --slate-500: #64748b;
            --slate-600: #475569;
            --slate-700: #334155;
            --slate-800: #1e293b;
            --slate-900: #0f172a;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-card: 0 4px 24px rgba(2, 132, 199, 0.08);
            --shadow-hover: 0 8px 32px rgba(2, 132, 199, 0.16);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            background-color: #ffffff;
            color: var(--slate-800);
            line-height: 1.7;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

        /* Header */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(15, 23, 42, 0.06);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: var(--slate-600);
            transition: all 0.25s ease;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--brand-600);
            background: var(--brand-50);
        }

        .nav-link.active {
            color: var(--brand-600);
            background: var(--brand-50);
            font-weight: 600;
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, #0ea5e9, #0369a1);
            color: #fff !important;
            padding: 10px 20px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 14px;
            box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .btn-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(2, 132, 199, 0.4);
        }

        .btn-accent:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(2, 132, 199, 0.3);
        }

        .search-wrap {
            position: relative;
        }

        .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--slate-400);
            font-size: 13px;
            pointer-events: none;
            z-index: 1;
        }

        .search-input {
            width: 200px;
            padding: 8px 14px 8px 36px;
            border-radius: 10px;
            border: 1px solid var(--slate-200);
            background: var(--slate-50);
            font-size: 13px;
            color: var(--slate-800);
            transition: all 0.25s ease;
        }

        .search-input:focus {
            outline: none;
            border-color: var(--brand-400);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
            width: 240px;
        }

        .search-input::placeholder {
            color: var(--slate-400);
        }

        /* Mobile menu */
        .mobile-menu {
            display: none;
            padding: 16px 24px 24px;
            border-top: 1px solid rgba(15, 23, 42, 0.05);
            background: #fff;
        }

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

        .mobile-menu .nav-link {
            display: flex;
            width: 100%;
            padding: 12px 16px;
            margin-bottom: 4px;
        }

        @media (min-width: 768px) {
            .mobile-menu {
                display: none !important;
            }
        }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
        }

        .site-footer .footer-logo {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
        }

        .site-footer a {
            transition: color 0.2s ease;
        }

        /* Hero */
        .hero-section {
            position: relative;
            min-height: 600px;
            display: flex;
            align-items: center;
            background-image: linear-gradient(rgba(15, 23, 42, 0.72), rgba(15, 23, 42, 0.72)), url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            color: #fff;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            font-size: 13px;
            font-weight: 500;
            color: #e0f2fe;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 48px;
            padding: 24px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
        }

        @media (max-width: 640px) {
            .hero-section {
                min-height: 520px;
                padding: 40px 0;
            }
            .hero-stats {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 12px;
                padding: 16px 0;
            }
        }

        /* Cards */
        .feature-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            border: 1px solid #f1f5f9;
            box-shadow: var(--shadow-card);
            transition: all 0.35s ease;
            height: 100%;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--brand-200);
        }

        .feature-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, #0ea5e9, #0369a1);
            box-shadow: 0 6px 16px rgba(2, 132, 199, 0.25);
            margin-bottom: 20px;
        }

        /* Product card */
        .product-card {
            background: #fff;
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid #f1f5f9;
            box-shadow: var(--shadow-card);
            transition: all 0.35s ease;
            height: 100%;
        }

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

        .product-card .product-img {
            height: 240px;
            object-fit: cover;
            width: 100%;
            transition: transform 0.5s ease;
        }

        .product-card:hover .product-img {
            transform: scale(1.05);
        }

        .product-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(255, 255, 255, 0.95);
            color: var(--brand-700);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            backdrop-filter: blur(4px);
        }

        /* Scene cards */
        .scene-card {
            border-radius: var(--radius-xl);
            overflow: hidden;
            position: relative;
            height: 320px;
            box-shadow: var(--shadow-card);
            transition: all 0.35s ease;
        }

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

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

        .scene-card:hover img {
            transform: scale(1.06);
        }

        .scene-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.3) 50%, rgba(15, 23, 42, 0) 100%);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 28px;
            color: #fff;
        }

        /* Compare */
        .compare-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            background: #fff;
        }

        .compare-table th,
        .compare-table td {
            padding: 18px 20px;
            text-align: center;
            border-bottom: 1px solid #f1f5f9;
            font-size: 14px;
        }

        .compare-table th {
            background: #f8fafc;
            font-weight: 600;
            color: var(--slate-800);
        }

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

        .compare-table .check-yes {
            color: #10b981;
            font-weight: 600;
        }

        .compare-table .check-no {
            color: #cbd5e1;
        }

        /* Testimonial */
        .testimonial-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid #f1f5f9;
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
            height: 100%;
        }

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

        .testimonial-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, #bae6fd, #0ea5e9);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 16px;
        }

        /* FAQ */
        .faq-item {
            background: #fff;
            border: 1px solid #f1f5f9;
            border-radius: var(--radius-md);
            padding: 0;
            overflow: hidden;
            transition: all 0.3s ease;
            margin-bottom: 12px;
        }

        .faq-item summary {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 15px;
            color: var(--slate-800);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.2s;
        }

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

        .faq-item summary:hover {
            color: var(--brand-600);
            background: #f8fafc;
        }

        .faq-item .fa-chevron-down {
            transition: transform 0.3s ease;
            color: var(--slate-400);
            font-size: 14px;
        }

        .faq-item[open] .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--brand-500);
        }

        .faq-answer {
            padding: 0 24px 20px;
            color: var(--slate-600);
            font-size: 14px;
            line-height: 1.8;
        }

        .faq-item[open] {
            border-color: var(--brand-200);
            box-shadow: var(--shadow-card);
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, #0c4a6e, #0ea5e9);
            border-radius: var(--radius-xl);
            padding: 60px 48px;
            position: relative;
            overflow: hidden;
            color: #fff;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -40px;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
        }

        /* Button outline */
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: 12px;
            border: 1.5px solid rgba(255, 255, 255, 0.6);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            transition: all 0.3s ease;
            background: transparent;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
        }

        /* Section titles */
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--slate-900);
            line-height: 1.3;
            letter-spacing: -0.03em;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--slate-500);
            margin-top: 8px;
            line-height: 1.7;
        }

        .section-badge {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 999px;
            background: var(--brand-50);
            color: var(--brand-600);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
            border: 1px solid var(--brand-100);
        }

        /* Stat block */
        .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: var(--slate-900);
            line-height: 1.2;
        }

        .stat-label {
            font-size: 14px;
            color: var(--slate-400);
            margin-top: 4px;
        }

        @media (max-width: 640px) {
            .section-title {
                font-size: 26px;
            }
            .stat-number {
                font-size: 28px;
            }
            .cta-section {
                padding: 40px 24px;
            }
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* Focus accessibility */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        summary:focus-visible {
            outline: 3px solid rgba(14, 165, 233, 0.4);
            outline-offset: 2px;
            border-radius: 6px;
        }

/* roulang page: article */
:root {
            --container-max: 1280px;
            --brand-gradient: linear-gradient(135deg, #0ea5e9 0%, #0369a1 100%);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body { font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; background: #f8fafc; color: #334155; line-height: 1.6; }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; height: auto; display: block; }
        button { cursor: pointer; border: none; background: none; font: inherit; }

        .container-custom { max-width: var(--container-max); margin: 0 auto; padding: 0 1.5rem; width: 100%; }

        .site-header { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid rgba(226, 232, 240, 0.8); box-shadow: 0 1px 10px rgba(0, 0, 0, 0.04); }
        .desktop-nav { display: flex; align-items: center; gap: 0.25rem; }
        .nav-link { display: inline-flex; align-items: center; padding: 0.5rem 0.75rem; font-size: 0.875rem; font-weight: 500; color: #475569; border-radius: 0.5rem; transition: all 0.2s ease; white-space: nowrap; }
        .nav-link:hover { color: var(--brand-500); background: rgba(14, 165, 233, 0.08); }
        .nav-link.active { color: var(--brand-600); background: rgba(14, 165, 233, 0.1); font-weight: 600; }

        .search-input { width: 180px; padding: 0.5rem 0.75rem 0.5rem 2.2rem; border: 1px solid #e2e8f0; border-radius: 0.75rem; background: #f8fafc; font-size: 0.875rem; color: #334155; transition: all 0.2s ease; }
        .search-input:focus { outline: none; border-color: var(--brand-500); background: white; box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1); width: 220px; }
        .search-icon { position: absolute; left: 0.75rem; top: 0.625rem; font-size: 0.875rem; color: #94a3b8; pointer-events: none; }

        .btn-accent { display: inline-flex; align-items: center; gap: 0.5rem; background: var(--brand-gradient); color: white; padding: 0.55rem 1.25rem; border-radius: 0.75rem; font-weight: 600; font-size: 0.875rem; box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25); transition: all 0.2s ease; border: none; }
        .btn-accent:hover { box-shadow: 0 4px 16px rgba(2, 132, 199, 0.35); transform: translateY(-1px); color: white; }
        .btn-accent:active { transform: translateY(0); box-shadow: 0 2px 6px rgba(2, 132, 199, 0.2); }
        .btn-accent:focus-visible { outline: 2px solid rgba(14, 165, 233, 0.5); outline-offset: 2px; }
        .btn-outline { display: inline-flex; align-items: center; gap: 0.5rem; border: 1.5px solid white; color: white; padding: 0.55rem 1.25rem; border-radius: 0.75rem; font-weight: 600; font-size: 0.875rem; transition: all 0.2s ease; background: transparent; }
        .btn-outline:hover { background: rgba(255, 255, 255, 0.15); transform: translateY(-1px); }

        .mobile-menu { display: none; flex-direction: column; gap: 0.25rem; padding: 1rem 1.5rem; background: white; border-top: 1px solid #e2e8f0; }
        .mobile-menu.open { display: flex; }
        .mobile-menu .nav-link { padding: 0.75rem; font-size: 1rem; }
        .mobile-toggle { display: flex; }

        .section-tag { display: inline-flex; align-items: center; gap: 0.375rem; padding: 0.35rem 1rem; background: linear-gradient(135deg, rgba(14, 165, 233, 0.1), rgba(3, 105, 161, 0.1)); color: #0284c7; border-radius: 9999px; font-size: 0.8125rem; font-weight: 600; letter-spacing: 0.02em; border: 1px solid rgba(14, 165, 233, 0.15); }

        .article-content { font-size: 1rem; line-height: 1.85; color: #334155; word-break: break-word; }
        .article-content h2 { font-size: 1.5rem; font-weight: 700; color: #0f172a; margin: 2.25rem 0 1rem; padding-bottom: 0.6rem; border-bottom: 2px solid #f1f5f9; letter-spacing: -0.01em; }
        .article-content h3 { font-size: 1.25rem; font-weight: 600; color: #1e293b; margin: 1.75rem 0 0.75rem; }
        .article-content h4 { font-size: 1.05rem; font-weight: 600; color: #334155; margin: 1.25rem 0 0.5rem; }
        .article-content p { margin: 1.125rem 0; }
        .article-content ul { margin: 1.125rem 0; padding-left: 1.5rem; list-style: disc; }
        .article-content ol { margin: 1.125rem 0; padding-left: 1.5rem; list-style: decimal; }
        .article-content li { margin: 0.45rem 0; }
        .article-content a { color: #0284c7; text-decoration: underline; text-underline-offset: 3px; transition: color 0.2s; }
        .article-content a:hover { color: #0369a1; }
        .article-content blockquote { border-left: 4px solid var(--brand-500); background: #f0f9ff; padding: 1rem 1.5rem; margin: 1.5rem 0; border-radius: 0 0.75rem 0.75rem 0; }
        .article-content img { border-radius: 1rem; margin: 1.5rem 0; box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06); }
        .article-content iframe { border-radius: 1rem; margin: 1.5rem 0; width: 100%; max-width: 100%; aspect-ratio: 16/9; border: none; }
        .article-content table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.925rem; }
        .article-content th, .article-content td { border: 1px solid #e2e8f0; padding: 0.75rem 1rem; text-align: left; }
        .article-content th { background: #f8fafc; font-weight: 600; color: #0f172a; }
        .article-content tr:nth-child(even) td { background: #fafafa; }
        .article-content hr { border: none; border-top: 1px solid #e2e8f0; margin: 2rem 0; }

        .badge { display: inline-flex; align-items: center; padding: 0.35rem 0.9rem; background: #f0f9ff; color: #0284c7; border: 1px solid rgba(14, 165, 233, 0.15); border-radius: 9999px; font-size: 0.8125rem; font-weight: 500; transition: all 0.2s ease; }
        .badge:hover { background: #e0f2fe; }
        a.badge:hover { border-color: rgba(14, 165, 233, 0.4); }

        .share-btn { display: inline-flex; align-items: center; justify-content: center; width: 2rem; height: 2rem; border-radius: 0.5rem; background: #f8fafc; color: #64748b; font-size: 0.875rem; border: 1px solid #e2e8f0; transition: all 0.2s ease; }
        .share-btn:hover { background: var(--brand-500); color: white; border-color: var(--brand-500); transform: translateY(-2px); }

        .faq-item { border: 1px solid #e2e8f0; border-radius: 1rem; background: white; overflow: hidden; transition: all 0.2s ease; }
        .faq-item:hover { border-color: rgba(14, 165, 233, 0.3); box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05); }
        .faq-item[open] { border-color: rgba(14, 165, 233, 0.2); box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06); }
        .faq-item summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.25rem 1.5rem; font-weight: 600; color: #0f172a; font-size: 1rem; transition: background 0.2s; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary:hover { background: #f8fafc; }
        .faq-item .faq-icon { transition: transform 0.3s ease; color: var(--brand-500); flex-shrink: 0; }
        .faq-item[open] .faq-icon { transform: rotate(180deg); }
        .faq-item .faq-body { padding: 0 1.5rem 1.25rem; color: #64748b; font-size: 0.95rem; line-height: 1.75; }

        .site-footer { background: #0f172a; color: #94a3b8; }

        .card-hover { transition: all 0.3s ease; }
        .card-hover:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08); }

        @keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
        .fade-in-up { animation: fadeInUp 0.6s ease both; }

        @media (max-width: 768px) {
            .desktop-nav { display: none !important; }
            .mobile-toggle { display: flex !important; }
            .container-custom { padding: 0 1rem; }
        }
        @media (min-width: 769px) {
            .mobile-toggle { display: none !important; }
            .mobile-menu { display: none !important; }
        }

/* roulang page: category2 */
:root {
            --brand-500: #3399ff;
            --brand-600: #1a78f5;
            --brand-700: #1662e1;
            --ink: #0f172a;
            --ink-soft: #475569;
            --muted: #94a3b8;
            --bg: #f8fafc;
            --card-bg: #ffffff;
            --border: #e2e8f0;
            --radius: 16px;
            --shadow-card: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 12px 32px rgba(26, 120, 245, 0.12);
        }

        * {
            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;
            color: var(--ink);
            background: var(--bg);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
            font: inherit;
        }

        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            transition: box-shadow .3s;
        }

        .site-header:hover,
        .site-header.is-sticky {
            box-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
        }

        .desktop-nav {
            display: flex;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: #475569;
            transition: all .2s;
            white-space: nowrap;
        }

        .nav-link:hover {
            background: #f1f5f9;
            color: #1662e1;
        }

        .nav-link.active {
            background: #eff8ff;
            color: #1662e1;
            font-weight: 600;
        }

        .search-input {
            width: 180px;
            padding: 9px 16px 9px 38px;
            border-radius: 999px;
            border: 1px solid #e2e8f0;
            background: #f8fafc;
            font-size: 13px;
            color: #0f172a;
            outline: none;
            transition: all .25s;
        }

        .search-input:focus {
            border-color: #3399ff;
            background: #fff;
            box-shadow: 0 0 0 4px rgba(51, 153, 255, 0.12);
            width: 220px;
        }

        .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 12px;
            color: #94a3b8;
            pointer-events: none;
            z-index: 1;
        }

        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: 10px;
            background: linear-gradient(135deg, #3399ff, #1662e1);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(26, 120, 245, 0.3);
            transition: all .25s;
        }

        .btn-accent:hover {
            box-shadow: 0 8px 24px rgba(26, 120, 245, 0.4);
            transform: translateY(-1px);
        }

        .btn-accent:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 120, 245, 0.3);
        }

        .mobile-toggle {
            display: none;
        }

        .mobile-menu {
            display: none;
            padding: 12px 24px 24px;
            border-top: 1px solid #f1f5f9;
            background: #fff;
            flex-direction: column;
            gap: 4px;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu .nav-link {
            padding: 12px 16px;
            font-size: 15px;
        }

        /* Section */
        .section-pad {
            padding: 80px 0;
        }

        .section-pad-sm {
            padding: 56px 0;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.02em;
            color: #0f172a;
        }

        .section-underline {
            width: 48px;
            height: 4px;
            border-radius: 999px;
            background: linear-gradient(90deg, #3399ff, #22d3ee);
            margin-top: 14px;
        }

        .badge-pill {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: 999px;
            background: #eff8ff;
            color: #1662e1;
            font-size: 12px;
            font-weight: 600;
            border: 1px solid #bce4ff;
        }

        /* Card */
        .feature-card {
            background: #fff;
            border-radius: 18px;
            padding: 32px 24px;
            border: 1px solid #e2e8f0;
            transition: all .3s;
            box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(26, 120, 245, 0.08);
            border-color: #bce4ff;
        }

        .icon-wrap {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: #fff;
            margin-bottom: 18px;
        }

        .icon-bg-1 {
            background: linear-gradient(135deg, #3399ff, #22d3ee);
        }

        .icon-bg-2 {
            background: linear-gradient(135deg, #f59e0b, #f97316);
        }

        .icon-bg-3 {
            background: linear-gradient(135deg, #8b5cf6, #6366f1);
        }

        .icon-bg-4 {
            background: linear-gradient(135deg, #10b981, #06b6d4);
        }

        /* Scene card */
        .scene-card {
            position: relative;
            border-radius: 18px;
            overflow: hidden;
            border: 1px solid #e2e8f0;
            transition: all .3s;
            background: #fff;
        }

        .scene-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08);
        }

        .scene-card img {
            height: 180px;
            width: 100%;
            object-fit: cover;
            transition: transform .5s;
        }

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

        .scene-body {
            padding: 20px 20px 24px;
        }

        /* Steps */
        .step-item {
            position: relative;
            background: #fff;
            border-radius: 16px;
            padding: 28px 22px;
            border: 1px solid #e2e8f0;
            transition: all .3s;
            text-align: center;
        }

        .step-item:hover {
            border-color: #bce4ff;
            box-shadow: 0 8px 24px rgba(26, 120, 245, 0.08);
        }

        .step-num {
            width: 42px;
            height: 42px;
            margin: 0 auto 14px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 16px;
            color: #fff;
            background: linear-gradient(135deg, #3399ff, #1662e1);
            box-shadow: 0 4px 12px rgba(26, 120, 245, 0.25);
        }

        /* FAQ */
        .faq-item {
            border: 1px solid #e2e8f0;
            border-radius: 14px;
            background: #fff;
            margin-bottom: 12px;
            overflow: hidden;
            transition: all .25s;
        }

        .faq-item:focus-within,
        .faq-item:hover {
            border-color: #bce4ff;
        }

        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 22px;
            font-size: 15px;
            font-weight: 600;
            color: #0f172a;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            transition: color .2s;
        }

        .faq-question:hover {
            color: #1662e1;
        }

        .faq-question .fa-chevron-down {
            font-size: 12px;
            color: #94a3b8;
            transition: transform .3s;
            flex-shrink: 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 22px;
            font-size: 14px;
            color: #475569;
            line-height: 1.7;
            transition: max-height .35s ease, padding .3s ease;
        }

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

        .faq-item.active .fa-chevron-down {
            transform: rotate(180deg);
            color: #1662e1;
        }

        /* Footer */
        .site-footer {
            background: #0b1220;
            color: #94a3b8;
        }

        .footer-logo {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
        }

        .site-footer a {
            color: #94a3b8;
        }

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

        /* CTA */
        .cta-section {
            position: relative;
            background: linear-gradient(135deg, #0b1220 0%, #152c57 50%, #1662e1 100%);
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(34, 211, 238, 0.3) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        /* Hero */
        .hero-section {
            position: relative;
            min-height: 560px;
            display: flex;
            align-items: center;
            color: #fff;
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            background-image: url('/assets/images/backpic/back-2.webp');
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(105deg, rgba(2, 6, 23, 0.9) 0%, rgba(2, 6, 23, 0.7) 40%, rgba(2, 6, 23, 0.35) 100%);
        }

        /* Button */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 12px;
            background: linear-gradient(135deg, #3399ff, #1a78f5);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            box-shadow: 0 6px 20px rgba(26, 120, 245, 0.35);
            transition: all .25s;
        }

        .btn-primary:hover {
            box-shadow: 0 10px 30px rgba(26, 120, 245, 0.45);
            transform: translateY(-2px);
        }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 26px;
            border-radius: 12px;
            border: 1.5px solid rgba(255, 255, 255, 0.5);
            color: #fff;
            font-weight: 600;
            font-size: 14px;
            transition: all .25s;
            background: transparent;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
        }

        /* Stats bar */
        .stat-block {
            padding: 30px 16px;
            text-align: center;
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: background .3s;
        }

        .stat-block:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }

        .stat-label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 6px;
        }

        /* Responsive */
        @media (max-width: 1023px) {
            .desktop-nav {
                display: none;
            }

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

            .hero-section {
                min-height: 480px;
            }

            .section-title {
                font-size: 26px;
            }
        }

        @media (max-width: 767px) {
            .container-custom {
                padding: 0 18px;
            }

            .section-pad {
                padding: 56px 0;
            }

            .hero-section {
                min-height: 420px;
            }

            .hero-content h1 {
                font-size: 28px;
            }

            .search-wrap {
                display: none;
            }

            .btn-accent {
                display: none;
            }

            .section-title {
                font-size: 22px;
            }

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

        @media (max-width: 520px) {
            .hero-section {
                min-height: 380px;
            }

            .hero-content h1 {
                font-size: 24px;
                line-height: 1.3;
            }

            .hero-content p {
                font-size: 14px;
            }

            .btn-primary,
            .btn-outline-light {
                width: 100%;
                justify-content: center;
            }
        }

        /* focus-visible */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(51, 153, 255, 0.5);
            outline-offset: 2px;
        }

/* roulang page: category3 */
:root {
            --brand-50: #f0f7ff;
            --brand-100: #e0eeff;
            --brand-200: #b9dcff;
            --brand-300: #7cbfff;
            --brand-400: #359dff;
            --brand-500: #0f7df2;
            --brand-600: #0061cc;
            --brand-700: #004ea6;
            --brand-800: #064386;
            --brand-900: #0b3868;
            --bg-light: #f6f8fc;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border-color: #e2e8f0;
            --card-radius: 1rem;
            --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
            --shadow-md: 0 8px 24px rgba(0,0,0,.08);
            --shadow-lg: 0 20px 48px rgba(0,0,0,.10);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            color: var(--text-main);
            background-color: #fff;
            line-height: 1.6;
            margin: 0;
            padding: 0;
        }

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

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

        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,.92);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(226,232,240,.7);
            box-shadow: 0 1px 12px rgba(15,125,242,.05);
        }

        .site-header .desktop-nav {
            display: flex;
        }

        .site-header .nav-link {
            display: inline-flex;
            align-items: center;
            gap: .3rem;
            padding: .4rem .8rem;
            border-radius: .6rem;
            font-size: .875rem;
            font-weight: 500;
            color: var(--text-main);
            transition: all .2s ease;
            white-space: nowrap;
        }

        .site-header .nav-link:hover {
            color: var(--brand-600);
            background: var(--brand-50);
        }

        .site-header .nav-link.active {
            color: var(--brand-600);
            font-weight: 600;
            background: linear-gradient(135deg, rgba(15,125,242,.08), rgba(0,97,204,.05));
        }

        .site-header .search-input {
            width: 180px;
            height: 38px;
            border-radius: 999px;
            border: 1px solid var(--border-color);
            background: #f8fafc;
            padding: 0 16px 0 36px;
            font-size: .82rem;
            color: var(--text-main);
            outline: none;
            transition: all .2s ease;
        }

        .site-header .search-input:focus {
            width: 220px;
            border-color: var(--brand-300);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(15,125,242,.12);
        }

        .site-header .search-icon {
            position: absolute;
            top: 50%;
            left: 14px;
            transform: translateY(-50%);
            font-size: .8rem;
            color: var(--text-light);
            pointer-events: none;
        }

        .site-header .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
            color: #fff;
            font-weight: 600;
            font-size: .875rem;
            padding: .5rem 1rem;
            border-radius: .65rem;
            box-shadow: 0 4px 14px rgba(15,125,242,.3);
            transition: all .25s ease;
        }

        .site-header .btn-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(15,125,242,.35);
            color: #fff;
        }

        .site-header .mobile-toggle {
            display: none;
        }

        .site-header .mobile-menu {
            display: none;
            position: absolute;
            top: 64px;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-lg);
            padding: .75rem 1.25rem 1.25rem;
            border-radius: 0 0 1rem 1rem;
        }

        .site-header .mobile-menu.open {
            display: block;
        }

        .site-header .mobile-menu .nav-link {
            display: block;
            padding: .7rem .8rem;
            border-radius: .6rem;
            font-size: .925rem;
        }

        @media (max-width: 1023px) {
            .site-header .desktop-nav,
            .site-header .search-wrap {
                display: none !important;
            }
            .site-header .mobile-toggle {
                display: inline-flex;
            }
        }

        @media (max-width: 640px) {
            .site-header .btn-accent,
            .site-header .login-link {
                display: none !important;
            }
            .site-header .mobile-toggle {
                display: inline-flex;
            }
        }

        /* ===== 通用按钮 ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
            color: #fff;
            font-weight: 600;
            padding: .7rem 1.5rem;
            border-radius: .8rem;
            box-shadow: 0 6px 18px rgba(15,125,242,.28);
            transition: all .25s ease;
            font-size: .925rem;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 30px rgba(15,125,242,.34);
            color: #fff;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            border: 1.5px solid var(--brand-200);
            color: var(--brand-600);
            font-weight: 600;
            padding: .65rem 1.35rem;
            border-radius: .8rem;
            background: rgba(255,255,255,.8);
            backdrop-filter: blur(6px);
            transition: all .25s ease;
            font-size: .9rem;
        }

        .btn-outline:hover {
            background: var(--brand-50);
            border-color: var(--brand-400);
            transform: scale(1.02);
        }

        /* ===== 卡片 ===== */
        .card-item {
            background: #fff;
            border-radius: var(--card-radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            padding: 1.5rem;
            transition: all .3s ease;
        }

        .card-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(15,125,242,.25);
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 1rem;
            padding: 1.25rem 1.5rem;
            margin-bottom: .75rem;
            transition: all .25s ease;
        }

        .faq-item:hover {
            border-color: rgba(15,125,242,.3);
            box-shadow: var(--shadow-sm);
        }

        .faq-item summary {
            cursor: pointer;
            font-weight: 600;
            color: var(--text-main);
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            outline: none;
        }

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

        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: .75rem;
            color: var(--brand-500);
            transition: transform .25s ease;
            flex-shrink: 0;
        }

        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }

        .faq-item .faq-answer {
            margin-top: .75rem;
            color: var(--text-muted);
            font-size: .9rem;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: linear-gradient(160deg, #0b1a33 0%, #0f2240 50%, #132c50 100%);
            color: #cbd5e1;
        }

        .site-footer a {
            color: #94a3b8;
            transition: color .2s ease;
        }

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

        .footer-logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -.01em;
        }

        /* ===== Hero ===== */
        .category-hero {
            position: relative;
            min-height: 480px;
            display: flex;
            align-items: center;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center center;
            isolation: isolate;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            z-index: -1;
            background: linear-gradient(100deg, rgba(255,255,255,.95) 20%, rgba(255,255,255,.72) 55%, rgba(255,255,255,.25) 100%);
        }

        .category-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            background: rgba(15,125,242,.1);
            color: var(--brand-600);
            font-weight: 600;
            font-size: .8rem;
            padding: .3rem .75rem;
            border-radius: 999px;
            border: 1px solid rgba(15,125,242,.2);
        }

        /* ===== 数据条 ===== */
        .stats-block {
            background: linear-gradient(135deg, var(--brand-600), var(--brand-800));
            border-radius: 1.2rem;
            box-shadow: 0 16px 40px rgba(0,97,204,.25);
        }

        /* ===== 图片卡片 ===== */
        .img-card {
            position: relative;
            border-radius: 1.1rem;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: all .35s ease;
        }

        .img-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .img-card:hover img {
            transform: scale(1.06);
        }

        .img-card .card-content {
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            padding: 1.25rem;
            background: linear-gradient(to top, rgba(15,23,42,.85), transparent);
            color: #fff;
        }

        .img-card .card-content .tag {
            display: inline-block;
            font-size: .7rem;
            font-weight: 600;
            background: rgba(255,255,255,.2);
            padding: .2rem .6rem;
            border-radius: 999px;
            margin-bottom: .5rem;
            backdrop-filter: blur(4px);
        }

        .img-card .card-content h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin: .2rem 0 .2rem;
        }

        .img-card .card-content p {
            font-size: .8rem;
            opacity: .85;
        }

        /* ===== 分栏列表 ===== */
        .check-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .check-list li {
            padding: .5rem 0;
            display: flex;
            align-items: flex-start;
            gap: .6rem;
            color: #334155;
            font-size: .92rem;
        }

        .check-list li i {
            color: var(--brand-500);
            margin-top: .25rem;
            flex-shrink: 0;
        }

        @media (max-width: 1024px) {
            .category-hero {
                min-height: 420px;
            }
        }

        @media (max-width: 768px) {
            .container-custom {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .category-hero {
                min-height: 380px;
                background-position: 60% center;
            }
            .category-hero::before {
                background: linear-gradient(180deg, rgba(255,255,255,.95) 30%, rgba(255,255,255,.75) 100%);
            }
        }

        @media (max-width: 520px) {
            .category-hero {
                min-height: 460px;
                align-items: flex-end;
                padding-bottom: 2rem;
            }
            .category-hero::before {
                background: linear-gradient(180deg, rgba(255,255,255,.8) 0%, rgba(255,255,255,.96) 80%);
            }
            .img-card img {
                height: 180px;
            }
        }

        /* ===== 应用场景 ===== */
        .scene-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 1.2rem;
            padding: 1.75rem;
            transition: all .3s ease;
            position: relative;
            overflow: hidden;
        }

        .scene-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--brand-400), var(--brand-600));
            opacity: 0;
            transition: opacity .3s ease;
        }

        .scene-card:hover::before {
            opacity: 1;
        }

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

        /* ===== 流程时间线 ===== */
        .step-item {
            position: relative;
            padding-left: 3rem;
            padding-bottom: 2rem;
        }

        .step-item::before {
            content: '';
            position: absolute;
            left: 1rem;
            top: 2rem;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, var(--brand-200), rgba(15,125,242,.05));
        }

        .step-item:last-child::before {
            display: none;
        }

        .step-num {
            position: absolute;
            left: 0;
            top: 0;
            width: 2.2rem;
            height: 2.2rem;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
            color: #fff;
            font-size: .8rem;
            font-weight: 700;
            border-radius: .7rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(15,125,242,.25);
        }

/* roulang page: category4 */
:root {
            --brand-50: #fff8ed;
            --brand-100: #ffedd5;
            --brand-200: #fed7aa;
            --brand-300: #fdba74;
            --brand-400: #fb923c;
            --brand-500: #f59e0b;
            --brand-600: #ea580c;
            --brand-700: #c2410c;
            --brand-800: #9a3412;
            --brand-900: #7c2d12;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-light: #94a3b8;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --border-color: #e2e8f0;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
            --shadow-md: 0 4px 16px rgba(15, 23, 42, .08);
            --shadow-lg: 0 12px 40px rgba(15, 23, 42, .12);
            --container-max: 1200px;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button {
            border: none;
            background: none;
            cursor: pointer;
            font-family: inherit;
        }
        .container-custom {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, .8);
            box-shadow: 0 1px 12px rgba(15, 23, 42, .04);
        }
        .desktop-nav {
            display: flex;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: .5rem .85rem;
            font-size: .9rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: .6rem;
            transition: all .2s ease;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--brand-600);
            background: var(--brand-50);
        }
        .nav-link.active {
            color: var(--brand-700);
            background: var(--brand-100);
            font-weight: 600;
        }
        .search-input {
            width: 190px;
            padding: .45rem .85rem .45rem 2.2rem;
            border: 1px solid var(--border-color);
            border-radius: 999px;
            background: #f8fafc;
            font-size: .85rem;
            color: var(--text-primary);
            transition: all .25s ease;
        }
        .search-input:focus {
            outline: none;
            border-color: var(--brand-400);
            box-shadow: 0 0 0 4px rgba(245, 158, 11, .12);
            background: #fff;
            width: 220px;
        }
        .search-icon {
            position: absolute;
            left: .85rem;
            top: 50%;
            transform: translateY(-50%);
            font-size: .8rem;
            color: var(--text-light);
            pointer-events: none;
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
            color: #fff;
            font-weight: 600;
            font-size: .875rem;
            padding: .55rem 1.15rem;
            border-radius: .65rem;
            box-shadow: 0 4px 14px rgba(234, 88, 12, .25);
            transition: all .25s ease;
        }
        .btn-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(234, 88, 12, .3);
        }
        .btn-accent:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(234, 88, 12, .2);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            border: 1.5px solid rgba(255, 255, 255, .4);
            color: #fff;
            font-weight: 500;
            font-size: .875rem;
            padding: .55rem 1.15rem;
            border-radius: .65rem;
            transition: all .25s ease;
            background: rgba(255, 255, 255, .08);
            backdrop-filter: blur(4px);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, .15);
            border-color: rgba(255, 255, 255, .7);
        }
        .mobile-toggle {
            display: none;
            width: 2.5rem;
            height: 2.5rem;
            align-items: center;
            justify-content: center;
            border-radius: .6rem;
            color: var(--text-primary);
            transition: background .2s;
        }
        .mobile-toggle:hover {
            background: var(--brand-50);
        }
        .mobile-menu {
            display: none;
            padding: .75rem 1.25rem 1rem;
            border-top: 1px solid var(--border-color);
            background: #fff;
        }
        .mobile-menu .nav-link {
            display: block;
            width: 100%;
            padding: .7rem .6rem;
            border-radius: .5rem;
        }
        .hero {
            position: relative;
            background: linear-gradient(135deg, rgba(15, 23, 42, .9), rgba(30, 41, 59, .7)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            padding: 5.5rem 0 5rem;
            color: #fff;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            padding: .35rem 1rem;
            background: rgba(255, 255, 255, .12);
            border: 1px solid rgba(255, 255, 255, .2);
            border-radius: 999px;
            font-size: .8rem;
            font-weight: 500;
            backdrop-filter: blur(4px);
            letter-spacing: .04em;
        }
        .hero-title {
            font-size: clamp(2rem, 4vw, 3.2rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.02em;
            margin-top: 1.2rem;
        }
        .hero-subtitle {
            font-size: clamp(.95rem, 1.6vw, 1.12rem);
            color: rgba(255, 255, 255, .85);
            max-width: 620px;
            margin-top: 1.1rem;
            line-height: 1.75;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            margin-top: 2.5rem;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, .15);
        }
        .hero-stat {
            text-align: left;
        }
        .hero-stat .num {
            font-size: 1.7rem;
            font-weight: 800;
            color: var(--brand-300);
        }
        .hero-stat .label {
            font-size: .8rem;
            color: rgba(255, 255, 255, .7);
            margin-top: .2rem;
        }
        .section {
            padding: 4.5rem 0;
        }
        .section-title {
            font-size: clamp(1.4rem, 2.5vw, 2rem);
            font-weight: 800;
            letter-spacing: -0.01em;
            text-align: center;
        }
        .section-subtitle {
            color: var(--text-secondary);
            text-align: center;
            max-width: 560px;
            margin: .6rem auto 0;
            font-size: .95rem;
            line-height: 1.7;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: all .3s ease;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(245, 158, 11, .25);
        }
        .icon-wrap {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 3rem;
            height: 3rem;
            border-radius: .8rem;
            font-size: 1.2rem;
            background: linear-gradient(135deg, var(--brand-100), var(--brand-200));
            color: var(--brand-700);
        }
        .guide-card .cover {
            height: 190px;
            overflow: hidden;
            border-radius: calc(var(--radius-xl) - 4px) calc(var(--radius-xl) - 4px) 0 0;
            position: relative;
        }
        .guide-card .cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .guide-card:hover .cover img {
            transform: scale(1.05);
        }
        .guide-card .tag {
            position: absolute;
            top: .9rem;
            left: .9rem;
            background: rgba(255, 255, 255, .92);
            color: var(--brand-700);
            font-size: .72rem;
            font-weight: 600;
            padding: .22rem .75rem;
            border-radius: 999px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, .08);
            backdrop-filter: blur(4px);
        }
        .flow-section {
            background: #f1f5f9;
        }
        .flow-item {
            position: relative;
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            padding: 1.5rem 1.25rem 1.25rem;
            transition: all .25s ease;
        }
        .flow-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .flow-num {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 2.4rem;
            height: 2.4rem;
            border-radius: .7rem;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-600));
            color: #fff;
            font-weight: 700;
            font-size: .95rem;
            box-shadow: 0 4px 12px rgba(234, 88, 12, .25);
        }
        .scenario-section {
            position: relative;
            background: linear-gradient(135deg, rgba(15, 23, 42, .92), rgba(30, 41, 59, .8)), url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            color: #fff;
        }
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.25rem;
        }
        .scenario-item {
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .14);
            border-radius: var(--radius-lg);
            padding: 1.5rem 1.25rem;
            text-align: center;
            backdrop-filter: blur(6px);
            transition: all .3s ease;
        }
        .scenario-item:hover {
            background: rgba(255, 255, 255, .14);
            transform: translateY(-4px);
        }
        .scenario-item i {
            font-size: 1.6rem;
            color: var(--brand-300);
            margin-bottom: .7rem;
        }
        .scenario-item h3 {
            font-size: .95rem;
            font-weight: 600;
        }
        .scenario-item p {
            font-size: .8rem;
            color: rgba(255, 255, 255, .7);
            margin-top: .4rem;
            line-height: 1.6;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 1.2rem 1.35rem;
            margin-bottom: .9rem;
            transition: all .25s ease;
        }
        .faq-item:hover {
            border-color: rgba(245, 158, 11, .3);
            box-shadow: var(--shadow-sm);
        }
        .faq-item summary {
            font-weight: 600;
            font-size: .95rem;
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            color: var(--text-primary);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: .75rem;
            color: var(--text-light);
            transition: transform .25s ease;
            flex-shrink: 0;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item .faq-body {
            margin-top: .8rem;
            color: var(--text-secondary);
            font-size: .88rem;
            line-height: 1.75;
            padding-top: .8rem;
            border-top: 1px dashed var(--border-color);
        }
        .cta-section {
            background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
            color: #fff;
            padding: 3.5rem 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, .08);
            border-radius: 50%;
            pointer-events: none;
        }
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
        }
        .footer-logo {
            font-size: 1.15rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -.01em;
        }
        .site-footer a {
            transition: color .2s ease;
        }
        @media (max-width: 1024px) {
            .desktop-nav {
                display: none;
            }
            .mobile-toggle {
                display: flex;
            }
            .mobile-menu.open {
                display: block;
            }
            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 3rem 0;
            }
            .hero {
                padding: 3.5rem 0 3rem;
            }
            .hero-stats {
                gap: 1.25rem;
            }
            .search-input {
                display: none;
            }
        }
        @media (max-width: 520px) {
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .container-custom {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .btn-accent .btn-text {
                display: none;
            }
            .hero-title {
                font-size: 1.7rem;
            }
        }