/* roulang page: index */
:root {
            --color-primary: #1a2a6c;
            --color-primary-light: #3454f5;
            --color-accent: #f0a030;
            --color-accent-light: #fbc95d;
            --color-bg: #f8fafc;
            --color-bg-alt: #eef4ff;
            --color-text: #1e293b;
            --color-text-soft: #64748b;
            --color-text-light: #94a3b8;
            --color-border: #e2e8f0;
            --color-card-bg: #ffffff;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.10);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.14);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            transition: var(--transition);
        }
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--color-primary-light);
            outline-offset: 2px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--color-border);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow-md);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .logo i {
            color: var(--color-accent);
            -webkit-text-fill-color: var(--color-accent);
            font-size: 1.6rem;
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .nav-desktop a {
            padding: 0.5rem 1.25rem;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--color-text-soft);
            position: relative;
            transition: var(--transition);
        }
        .nav-desktop a:hover {
            color: var(--color-primary);
            background: var(--color-bg-alt);
        }
        .nav-desktop a.active {
            color: var(--color-primary);
            font-weight: 600;
            background: var(--color-bg-alt);
        }
        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 2px;
        }
        .nav-cta {
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)) !important;
            color: #fff !important;
            padding: 0.5rem 1.5rem !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            margin-left: 0.75rem;
        }
        .nav-cta:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(52, 84, 245, 0.35) !important;
            background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary)) !important;
            color: #fff !important;
        }

        /* 移动端底部Tab */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--color-border);
            padding: 0.4rem 0 env(safe-area-inset-bottom, 0.4rem) 0;
            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
        }
        .mobile-bottom-nav .tab-list {
            display: flex;
            justify-content: space-around;
            align-items: stretch;
        }
        .mobile-bottom-nav .tab-item {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 0.35rem 0.25rem;
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--color-text-light);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            gap: 0.15rem;
            min-height: 52px;
        }
        .mobile-bottom-nav .tab-item i {
            font-size: 1.3rem;
            transition: var(--transition);
        }
        .mobile-bottom-nav .tab-item.active {
            color: var(--color-primary);
        }
        .mobile-bottom-nav .tab-item.active i {
            color: var(--color-accent);
        }
        .mobile-bottom-nav .tab-item:hover {
            color: var(--color-primary);
            background: var(--color-bg-alt);
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            background: linear-gradient(135deg, rgba(15, 26, 62, 0.92), rgba(26, 42, 108, 0.85)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            padding: 120px 1.5rem 80px;
            text-align: center;
            color: #fff;
            overflow: hidden;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--color-bg), transparent);
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 880px;
        }
        .hero-badge {
            display: inline-block;
            padding: 0.35rem 1.25rem;
            border-radius: 50px;
            background: rgba(240, 160, 48, 0.2);
            border: 1px solid rgba(240, 160, 48, 0.3);
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--color-accent-light);
            letter-spacing: 1px;
            margin-bottom: 1.5rem;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: clamp(2.6rem, 8vw, 4.8rem);
            font-weight: 900;
            line-height: 1.1;
            letter-spacing: -1.5px;
            margin-bottom: 1.2rem;
            background: linear-gradient(to right, #fff, var(--color-accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: clamp(1.05rem, 2.5vw, 1.35rem);
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            margin: 0 auto 2.2rem;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.9rem 2.4rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            background: linear-gradient(135deg, var(--color-accent), #e88d1a);
            color: #1a2a6c;
            box-shadow: 0 8px 24px rgba(240, 160, 48, 0.35);
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(240, 160, 48, 0.45);
            color: #1a2a6c;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.9rem 2.4rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border: 1.5px solid rgba(255, 255, 255, 0.25);
            color: #fff;
            transition: var(--transition);
            cursor: pointer;
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-3px);
            color: #fff;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 2rem 3.5rem;
            margin-top: 3.5rem;
            padding-top: 2.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.12);
        }
        .hero-stats .stat-item {
            text-align: center;
        }
        .hero-stats .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .hero-stats .stat-number span {
            color: var(--color-accent);
        }
        .hero-stats .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 0.2rem;
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 5rem 0;
        }
        .section-alt {
            background: var(--color-bg-alt);
        }
        .section-dark {
            background: var(--color-primary);
            color: #fff;
        }
        .section-title {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            font-weight: 800;
            text-align: center;
            margin-bottom: 0.75rem;
            letter-spacing: -0.5px;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--color-text-soft);
            text-align: center;
            max-width: 580px;
            margin: 0 auto 3rem;
        }
        .section-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.65);
        }

        /* ===== 分类卡片 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
        }
        .category-card {
            background: var(--color-card-bg);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .category-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: var(--transition);
        }
        .category-card:hover .card-img {
            transform: scale(1.03);
        }
        .category-card .card-body {
            padding: 1.5rem 1.75rem 2rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .card-tag {
            display: inline-block;
            padding: 0.2rem 0.9rem;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--color-bg-alt);
            color: var(--color-primary-light);
            margin-bottom: 0.75rem;
            align-self: flex-start;
        }
        .category-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--color-text);
        }
        .category-card p {
            font-size: 0.92rem;
            color: var(--color-text-soft);
            line-height: 1.7;
            flex: 1;
        }
        .category-card .card-link {
            margin-top: 1.25rem;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-primary-light);
            transition: var(--transition);
        }
        .category-card .card-link i {
            transition: var(--transition);
        }
        .category-card:hover .card-link i {
            transform: translateX(4px);
        }

        /* ===== 资讯列表 ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 1.5rem;
        }
        .news-card {
            background: var(--color-card-bg);
            border-radius: var(--radius-md);
            padding: 1.5rem 1.75rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--color-primary-light);
        }
        .news-card .meta {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.8rem;
            color: var(--color-text-light);
            margin-bottom: 0.6rem;
        }
        .news-card .meta .cat {
            padding: 0.15rem 0.7rem;
            border-radius: 50px;
            background: var(--color-bg-alt);
            color: var(--color-primary-light);
            font-weight: 500;
            font-size: 0.7rem;
        }
        .news-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            line-height: 1.5;
            margin-bottom: 0.5rem;
            color: var(--color-text);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-card p {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .news-card .foot {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 1rem;
            padding-top: 0.75rem;
            border-top: 1px solid var(--color-border);
            font-size: 0.8rem;
            color: var(--color-text-light);
        }
        .news-card .foot a {
            font-weight: 600;
            color: var(--color-primary-light);
        }
        .news-card .foot a i {
            transition: var(--transition);
        }
        .news-card .foot a:hover i {
            transform: translateX(4px);
        }

        /* ===== 数据/流程 ===== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 2rem;
            text-align: center;
        }
        .stats-row .stat-box {
            padding: 2rem 1rem;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        .stats-row .stat-box:hover {
            background: rgba(255, 255, 255, 0.10);
            transform: translateY(-4px);
        }
        .stats-row .stat-box .num {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1.2;
        }
        .stats-row .stat-box .label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 0.4rem;
        }

        /* ===== 特色/服务卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .feature-card {
            background: var(--color-card-bg);
            border-radius: var(--radius-md);
            padding: 2rem 1.75rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }
        .feature-card .icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: var(--color-bg-alt);
            color: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin: 0 auto 1.25rem;
            transition: var(--transition);
        }
        .feature-card:hover .icon {
            background: var(--color-primary);
            color: #fff;
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--color-text-soft);
            line-height: 1.7;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: var(--color-card-bg);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--color-primary-light);
        }
        .faq-item summary {
            padding: 1.25rem 1.75rem;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            list-style: none;
            transition: var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::before {
            content: '\f059';
            font-family: 'Font Awesome 6 Free';
            font-weight: 400;
            color: var(--color-accent);
            font-size: 1.1rem;
        }
        .faq-item summary::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            margin-left: auto;
            transition: var(--transition);
            color: var(--color-text-light);
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item .answer {
            padding: 0 1.75rem 1.25rem;
            font-size: 0.92rem;
            color: var(--color-text-soft);
            line-height: 1.8;
        }
        .faq-item .answer p {
            margin-bottom: 0.5rem;
        }
        .faq-item .answer p:last-child {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-box {
            background: linear-gradient(135deg, var(--color-primary), #0f1a3e);
            border-radius: var(--radius-xl);
            padding: 3.5rem 3rem;
            text-align: center;
            color: #fff;
            box-shadow: var(--shadow-xl);
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(240, 160, 48, 0.10), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-box h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.2rem);
            font-weight: 800;
            margin-bottom: 0.75rem;
        }
        .cta-box p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 520px;
            margin: 0 auto 2rem;
        }
        .cta-form {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.75rem;
            max-width: 520px;
            margin: 0 auto;
        }
        .cta-form input[type="email"] {
            flex: 1;
            min-width: 220px;
            padding: 0.9rem 1.5rem;
            border-radius: 50px;
            border: none;
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            font-size: 0.95rem;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .cta-form input[type="email"]::placeholder {
            color: rgba(255, 255, 255, 0.5);
        }
        .cta-form input[type="email"]:focus {
            background: rgba(255, 255, 255, 0.18);
            border-color: var(--color-accent);
            outline: none;
        }
        .cta-form button {
            padding: 0.9rem 2.2rem;
            border-radius: 50px;
            border: none;
            background: var(--color-accent);
            color: #1a2a6c;
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .cta-form button:hover {
            background: var(--color-accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(240, 160, 48, 0.35);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #0f1a3e;
            color: rgba(255, 255, 255, 0.7);
            padding: 4rem 0 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-col h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-col p {
            font-size: 0.9rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
        }
        .footer-col ul li {
            margin-bottom: 0.5rem;
        }
        .footer-col ul li a {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--color-accent);
            padding-left: 4px;
        }
        .footer-col .logo-sm {
            font-size: 1.3rem;
            font-weight: 800;
            background: linear-gradient(135deg, #fff, var(--color-accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.75rem;
            display: inline-block;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 1.5rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a:hover {
            color: var(--color-accent);
        }
        .footer-social {
            display: flex;
            gap: 0.75rem;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--color-accent);
            color: #1a2a6c;
        }

        /* ===== 空状态 ===== */
        .empty-state {
            text-align: center;
            padding: 2.5rem 1rem;
            color: var(--color-text-light);
        }
        .empty-state i {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            opacity: 0.4;
        }
        .empty-state p {
            font-size: 1rem;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .hero {
                min-height: 90vh;
                padding: 100px 1.5rem 60px;
            }
        }

        @media (max-width: 768px) {
            .site-header {
                display: none;
            }
            .mobile-bottom-nav {
                display: block;
            }
            body {
                padding-bottom: 72px;
            }
            .hero {
                min-height: 85vh;
                padding: 80px 1rem 50px;
            }
            .hero h1 {
                font-size: clamp(2rem, 10vw, 3rem);
            }
            .hero-stats {
                gap: 1.2rem 2rem;
                margin-top: 2.5rem;
                padding-top: 1.8rem;
            }
            .hero-stats .stat-number {
                font-size: 1.6rem;
            }
            .section {
                padding: 3.5rem 0;
            }
            .category-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }
            .cta-box {
                padding: 2.5rem 1.5rem;
            }
            .cta-form {
                flex-direction: column;
            }
            .cta-form input[type="email"] {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 0.75rem;
                text-align: center;
            }
            .faq-item summary {
                padding: 1rem 1.25rem;
                font-size: 0.92rem;
            }
            .faq-item .answer {
                padding: 0 1.25rem 1rem;
                font-size: 0.88rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 2rem;
            }
        }

        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
            .stats-row .stat-box .num {
                font-size: 2rem;
            }
        }

        @media (min-width: 769px) {
            .site-header {
                display: block;
            }
            .mobile-bottom-nav {
                display: none !important;
            }
            body {
                padding-bottom: 0;
            }
        }

        /* 辅助 */
        .text-accent {
            color: var(--color-accent);
        }
        .bg-gradient-brand {
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
        }
        .scroll-mt {
            scroll-margin-top: 88px;
        }

        /* 加载动画 */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

/* roulang page: article */
:root {
            --primary: #dc2626;
            --primary-dark: #b91c1c;
            --primary-light: #fef2f2;
            --secondary: #1e293b;
            --accent: #f59e0b;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; background: var(--bg); color: var(--text); line-height: 1.7; -webkit-font-smoothing: antialiased; }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        .container-narrow { max-width: 840px; margin: 0 auto; padding: 0 24px; }

        /* header */
        .site-header { background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
        .header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
        .logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.6rem; color: var(--primary); letter-spacing: -0.5px; }
        .logo i { font-size: 1.8rem; color: var(--primary); }
        .nav-desktop { display: flex; align-items: center; gap: 8px; }
        .nav-desktop a { padding: 8px 20px; border-radius: 40px; font-weight: 500; font-size: 0.95rem; color: var(--text); transition: var(--transition); position: relative; }
        .nav-desktop a:hover { background: var(--primary-light); color: var(--primary); }
        .nav-desktop a.active { background: var(--primary); color: #fff; }
        .nav-desktop a.nav-cta { background: var(--primary); color: #fff; padding: 10px 28px; border-radius: 40px; font-weight: 600; }
        .nav-desktop a.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(220,38,38,0.3); }

        /* mobile bottom tab */
        .mobile-tab-bar { display: none; position: fixed; bottom: 0; left: 0; right: 0; background: rgba(255,255,255,0.96); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-top: 1px solid var(--border); z-index: 200; padding: 6px 0; padding-bottom: env(safe-area-inset-bottom); justify-content: space-around; }
        .mobile-tab-bar a { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 6px 12px; border-radius: 12px; font-size: 0.7rem; font-weight: 500; color: var(--text-light); transition: var(--transition); min-width: 56px; }
        .mobile-tab-bar a i { font-size: 1.3rem; }
        .mobile-tab-bar a.active { color: var(--primary); background: var(--primary-light); }
        .mobile-tab-bar a:hover { color: var(--primary); }

        /* hero banner */
        .article-hero { position: relative; min-height: 320px; display: flex; align-items: flex-end; padding: 80px 0 60px; background: var(--bg-dark); overflow: hidden; }
        .article-hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0.35; }
        .article-hero-overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(15,23,42,0.95) 0%, rgba(15,23,42,0.5) 60%, rgba(15,23,42,0.3) 100%); }
        .article-hero .container-narrow { position: relative; z-index: 2; }
        .article-hero .category-badge { display: inline-block; background: var(--primary); color: #fff; padding: 6px 18px; border-radius: 40px; font-size: 0.85rem; font-weight: 600; margin-bottom: 16px; letter-spacing: 0.3px; }
        .article-hero h1 { font-size: 2.6rem; font-weight: 800; color: #fff; line-height: 1.25; letter-spacing: -0.5px; margin-bottom: 16px; text-shadow: 0 2px 20px rgba(0,0,0,0.2); }
        .article-hero .meta-info { display: flex; flex-wrap: wrap; gap: 20px; color: rgba(255,255,255,0.7); font-size: 0.95rem; }
        .article-hero .meta-info i { margin-right: 6px; }

        /* article body */
        .article-body { padding: 60px 0 80px; background: var(--bg); }
        .article-content { font-size: 1.1rem; line-height: 1.9; color: var(--text); }
        .article-content p { margin-bottom: 1.6em; }
        .article-content h2 { font-size: 1.8rem; font-weight: 700; margin-top: 2em; margin-bottom: 0.8em; color: var(--secondary); }
        .article-content h3 { font-size: 1.4rem; font-weight: 600; margin-top: 1.6em; margin-bottom: 0.6em; color: var(--secondary); }
        .article-content ul, .article-content ol { margin-bottom: 1.6em; padding-left: 1.8em; }
        .article-content li { margin-bottom: 0.5em; }
        .article-content blockquote { border-left: 4px solid var(--primary); background: var(--primary-light); padding: 20px 28px; margin: 1.6em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-style: italic; color: var(--text); }
        .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
        .article-content a:hover { color: var(--primary-dark); }
        .article-content img { border-radius: var(--radius); margin: 1.6em 0; box-shadow: var(--shadow); }
        .article-footer-meta { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; }
        .article-tags { display: flex; flex-wrap: wrap; gap: 10px; }
        .article-tags .tag { background: var(--bg-alt); padding: 6px 18px; border-radius: 40px; font-size: 0.85rem; color: var(--text-light); border: 1px solid var(--border); transition: var(--transition); }
        .article-tags .tag:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }
        .article-share { display: flex; gap: 12px; align-items: center; }
        .article-share span { font-size: 0.9rem; color: var(--text-light); font-weight: 500; }
        .article-share a { width: 40px; height: 40px; border-radius: 50%; background: var(--bg-alt); display: flex; align-items: center; justify-content: center; color: var(--text-light); border: 1px solid var(--border); transition: var(--transition); font-size: 1.1rem; }
        .article-share a:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }

        /* not found */
        .not-found-box { text-align: center; padding: 100px 24px; }
        .not-found-box i { font-size: 4rem; color: var(--text-light); margin-bottom: 24px; opacity: 0.4; }
        .not-found-box h2 { font-size: 2rem; font-weight: 700; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-light); margin-bottom: 28px; font-size: 1.1rem; }
        .not-found-box .btn-back { display: inline-block; background: var(--primary); color: #fff; padding: 14px 36px; border-radius: 40px; font-weight: 600; transition: var(--transition); }
        .not-found-box .btn-back:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(220,38,38,0.3); }

        /* related */
        .related-section { background: var(--bg-alt); padding: 60px 0; }
        .related-section h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 32px; text-align: center; }
        .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .related-card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--border); }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
        .related-card .card-body { padding: 20px; }
        .related-card .card-body h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
        .related-card .card-body h3 a { color: var(--text); }
        .related-card .card-body h3 a:hover { color: var(--primary); }
        .related-card .card-body .meta { font-size: 0.85rem; color: var(--text-light); }

        /* footer */
        .site-footer { background: var(--bg-dark); color: rgba(255,255,255,0.8); padding: 60px 0 0; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
        .footer-col .logo-sm { font-size: 1.8rem; font-weight: 800; color: #fff; display: block; margin-bottom: 16px; }
        .footer-col p { font-size: 0.95rem; line-height: 1.8; color: rgba(255,255,255,0.6); max-width: 360px; }
        .footer-col h4 { color: #fff; font-weight: 600; font-size: 1.1rem; margin-bottom: 20px; }
        .footer-col ul { list-style: none; }
        .footer-col ul li { margin-bottom: 12px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.95rem; transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
        .footer-social { display: flex; gap: 16px; }
        .footer-social a { width: 44px; height: 44px; border-radius: 50%; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.7); font-size: 1.2rem; transition: var(--transition); }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 24px 0; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: rgba(255,255,255,0.4); }
        .footer-bottom span:last-child { color: rgba(255,255,255,0.25); }

        /* responsive */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .mobile-tab-bar { display: flex; }
            .site-header { border-bottom: none; }
            body { padding-bottom: 70px; }
            .header-inner { height: 64px; }
            .article-hero { min-height: 240px; padding: 60px 0 40px; }
            .article-hero h1 { font-size: 1.8rem; }
            .article-content { font-size: 1rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .related-grid { grid-template-columns: 1fr; }
            .logo { font-size: 1.3rem; }
            .article-hero .meta-info { gap: 12px; font-size: 0.85rem; flex-wrap: wrap; }
            .article-footer-meta { flex-direction: column; align-items: flex-start; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .container-narrow { padding: 0 16px; }
            .article-hero h1 { font-size: 1.5rem; }
            .article-content h2 { font-size: 1.4rem; }
            .article-content h3 { font-size: 1.2rem; }
            .mobile-tab-bar a { font-size: 0.65rem; min-width: 48px; }
            .mobile-tab-bar a i { font-size: 1.1rem; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

/* roulang page: category1 */
:root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --accent: #e85d3a;
            --accent-light: #f07a5a;
            --accent-dark: #c44424;
            --surface: #f8fafc;
            --surface-alt: #f1f5f9;
            --text-primary: #0f1e2e;
            --text-secondary: #4a5b6e;
            --text-muted: #8899aa;
            --border: #e2e8f0;
            --border-light: #f0f4f8;
            --shadow-card: 0 2px 12px rgba(26, 58, 92, 0.08);
            --shadow-card-hover: 0 8px 30px rgba(26, 58, 92, 0.15);
            --shadow-nav: 0 2px 20px rgba(26, 58, 92, 0.06);
            --shadow-btn: 0 4px 14px rgba(232, 93, 58, 0.25);
            --radius: 0.75rem;
            --radius-2xl: 1rem;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
            background: var(--surface);
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            transition: var(--transition);
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        @media (max-width: 640px) {
            .container {
                padding: 0 1rem;
            }
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-nav);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
        }
        .logo i {
            font-size: 1.6rem;
            color: var(--accent);
        }
        .logo:hover {
            color: var(--primary-light);
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .nav-desktop a {
            padding: 0.5rem 1.1rem;
            border-radius: 2rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-desktop a:hover {
            color: var(--primary);
            background: var(--primary-50);
        }
        .nav-desktop a.active {
            color: #fff;
            background: var(--primary);
            font-weight: 600;
        }
        .nav-desktop a.nav-cta {
            background: var(--accent);
            color: #fff;
            padding: 0.5rem 1.4rem;
            font-weight: 600;
            box-shadow: var(--shadow-btn);
        }
        .nav-desktop a.nav-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(232, 93, 58, 0.35);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary);
            cursor: pointer;
            padding: 0.25rem;
        }

        /* Mobile Drawer */
        .mobile-drawer {
            display: none;
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            height: 100vh;
            background: #fff;
            box-shadow: -8px 0 30px rgba(0, 0, 0, 0.15);
            z-index: 1100;
            padding: 2rem 1.5rem;
            transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            overflow-y: auto;
        }
        .mobile-drawer.open {
            right: 0;
        }
        .mobile-drawer-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 1050;
            backdrop-filter: blur(4px);
        }
        .mobile-drawer-overlay.open {
            display: block;
        }
        .mobile-drawer .drawer-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-light);
        }
        .mobile-drawer .drawer-header .logo-sm {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
        }
        .mobile-drawer .drawer-close {
            background: none;
            border: none;
            font-size: 1.4rem;
            color: var(--text-secondary);
            cursor: pointer;
        }
        .mobile-drawer nav a {
            display: block;
            padding: 0.8rem 0.5rem;
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .mobile-drawer nav a:hover {
            color: var(--primary);
            background: var(--primary-50);
            padding-left: 1rem;
        }
        .mobile-drawer nav a.active {
            color: var(--primary);
            font-weight: 700;
            border-left: 3px solid var(--accent);
            padding-left: 1rem;
        }
        .mobile-drawer .drawer-cta {
            margin-top: 2rem;
            display: block;
            text-align: center;
            padding: 0.9rem;
            background: var(--accent);
            color: #fff;
            border-radius: 2rem;
            font-weight: 600;
            box-shadow: var(--shadow-btn);
        }
        .mobile-drawer .drawer-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
        }

        /* Bottom Tab (mobile) */
        .bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border-light);
            z-index: 900;
            padding: 0.35rem 0 env(safe-area-inset-bottom, 0.35rem) 0;
            box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.06);
        }
        .bottom-tab .tab-inner {
            display: flex;
            justify-content: space-around;
            align-items: center;
        }
        .bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.15rem;
            padding: 0.35rem 0.5rem;
            font-size: 0.65rem;
            color: var(--text-muted);
            transition: var(--transition);
            border-radius: 0.5rem;
            min-width: 56px;
        }
        .bottom-tab a i {
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .bottom-tab a:hover {
            color: var(--primary);
        }
        .bottom-tab a.active {
            color: var(--accent);
        }
        .bottom-tab a.active i {
            transform: scale(1.05);
        }
        .bottom-tab a span {
            font-weight: 500;
            line-height: 1.2;
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none !important;
            }
            .mobile-toggle {
                display: block;
            }
            .bottom-tab {
                display: block;
            }
            .site-header .header-inner {
                height: 60px;
            }
            body {
                padding-bottom: 64px;
            }
        }
        @media (min-width: 769px) {
            .mobile-drawer,
            .mobile-drawer-overlay {
                display: none !important;
            }
        }

        /* ===== Hero (inner banner) ===== */
        .page-hero {
            position: relative;
            min-height: 320px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .page-hero .hero-bg {
            position: absolute;
            inset: 0;
            object-fit: cover;
            width: 100%;
            height: 100%;
            opacity: 0.45;
        }
        .page-hero .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,30,46,0.85) 0%, rgba(26,58,92,0.7) 50%, rgba(15,30,46,0.85) 100%);
        }
        .page-hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
            padding: 2rem 1.25rem;
        }
        .page-hero .hero-content h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        .page-hero .hero-content p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 1.5rem;
            line-height: 1.7;
        }
        .page-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(232, 93, 58, 0.2);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(232, 93, 58, 0.3);
            padding: 0.4rem 1.2rem;
            border-radius: 2rem;
            color: #fff;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 1.2rem;
        }
        .page-hero .hero-badge i {
            color: var(--accent-light);
        }
        @media (max-width: 768px) {
            .page-hero {
                min-height: 240px;
            }
            .page-hero .hero-content h1 {
                font-size: 1.8rem;
            }
            .page-hero .hero-content p {
                font-size: 0.95rem;
            }
        }
        @media (max-width: 520px) {
            .page-hero .hero-content h1 {
                font-size: 1.5rem;
            }
            .page-hero .hero-content p {
                font-size: 0.85rem;
            }
        }

        /* ===== Section Styles ===== */
        .section {
            padding: 5rem 0;
        }
        .section-alt {
            background: var(--surface-alt);
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
            letter-spacing: -0.01em;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 2.5rem;
            line-height: 1.7;
        }
        .section-title-center {
            text-align: center;
        }
        .section-subtitle-center {
            text-align: center;
            margin-left: auto;
            margin-right: auto;
        }
        @media (max-width: 768px) {
            .section {
                padding: 3rem 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .section-subtitle {
                font-size: 0.9rem;
                margin-bottom: 1.8rem;
            }
        }

        /* ===== Cards ===== */
        .card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--primary-100);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 1.25rem 1.5rem 1.5rem;
        }
        .card-body .card-tag {
            display: inline-block;
            padding: 0.2rem 0.7rem;
            border-radius: 1rem;
            font-size: 0.7rem;
            font-weight: 600;
            background: var(--primary-50);
            color: var(--primary);
            margin-bottom: 0.5rem;
            letter-spacing: 0.02em;
        }
        .card-body .card-tag.tag-accent {
            background: var(--accent-50);
            color: var(--accent-dark);
        }
        .card-body .card-tag.tag-green {
            background: #e6f7ed;
            color: #0a7e3c;
        }
        .card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.4rem;
            line-height: 1.4;
        }
        .card-body p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 0.8rem;
        }
        .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.78rem;
            color: var(--text-muted);
            padding-top: 0.6rem;
            border-top: 1px solid var(--border-light);
        }
        .card-body .card-meta i {
            margin-right: 0.3rem;
        }
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
        }

        /* ===== Featured / Large Card ===== */
        .featured-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
            background: #fff;
            border-radius: var(--radius-2xl);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .featured-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .featured-card .fc-img {
            width: 100%;
            height: 100%;
            min-height: 300px;
            object-fit: cover;
        }
        .featured-card .fc-body {
            padding: 2.5rem 2.5rem;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .featured-card .fc-body .fc-tag {
            display: inline-block;
            padding: 0.25rem 0.9rem;
            border-radius: 1rem;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--accent-50);
            color: var(--accent-dark);
            margin-bottom: 0.8rem;
            align-self: flex-start;
        }
        .featured-card .fc-body h2 {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 0.6rem;
            line-height: 1.3;
        }
        .featured-card .fc-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 1.2rem;
        }
        .featured-card .fc-body .fc-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            gap: 1rem;
            align-items: center;
        }
        @media (max-width: 768px) {
            .featured-card {
                grid-template-columns: 1fr;
            }
            .featured-card .fc-img {
                min-height: 200px;
                max-height: 240px;
            }
            .featured-card .fc-body {
                padding: 1.5rem 1.5rem;
            }
            .featured-card .fc-body h2 {
                font-size: 1.2rem;
            }
            .featured-card .fc-body p {
                font-size: 0.85rem;
            }
        }

        /* ===== Filter / Tab bar ===== */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-bottom: 2rem;
            align-items: center;
        }
        .filter-bar .filter-btn {
            padding: 0.45rem 1.2rem;
            border-radius: 2rem;
            font-size: 0.85rem;
            font-weight: 500;
            background: #fff;
            color: var(--text-secondary);
            border: 1px solid var(--border);
            cursor: pointer;
            transition: var(--transition);
        }
        .filter-bar .filter-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-50);
        }
        .filter-bar .filter-btn.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            font-weight: 600;
        }
        .filter-bar .filter-label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-right: 0.5rem;
        }
        @media (max-width: 520px) {
            .filter-bar {
                gap: 0.4rem;
            }
            .filter-bar .filter-btn {
                padding: 0.35rem 0.9rem;
                font-size: 0.78rem;
            }
        }

        /* ===== Stats / Highlight Row ===== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-item {
            text-align: center;
            background: #fff;
            padding: 1.8rem 1rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }
        .stat-item .stat-num {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 0.3rem;
        }
        .stat-item .stat-icon {
            font-size: 1.6rem;
            color: var(--accent);
            margin-bottom: 0.5rem;
        }
        @media (max-width: 768px) {
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 1rem;
            }
            .stat-item .stat-num {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 520px) {
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
                gap: 0.8rem;
            }
            .stat-item {
                padding: 1.2rem 0.8rem;
            }
            .stat-item .stat-num {
                font-size: 1.5rem;
            }
        }

        /* ===== CTA ===== */
        .cta-block {
            background: var(--primary);
            border-radius: var(--radius-2xl);
            padding: 3.5rem 3rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 20% 50%, rgba(232, 93, 58, 0.15) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-block .cta-content {
            position: relative;
            z-index: 1;
        }
        .cta-block h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 0.8rem;
        }
        .cta-block p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 520px;
            margin: 0 auto 1.8rem;
        }
        .cta-block .cta-btn {
            display: inline-block;
            padding: 0.9rem 2.4rem;
            border-radius: 2rem;
            font-size: 1rem;
            font-weight: 700;
            background: var(--accent);
            color: #fff;
            box-shadow: var(--shadow-btn);
            transition: var(--transition);
        }
        .cta-block .cta-btn:hover {
            background: var(--accent-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 28px rgba(232, 93, 58, 0.4);
        }
        @media (max-width: 768px) {
            .cta-block {
                padding: 2.5rem 1.5rem;
            }
            .cta-block h2 {
                font-size: 1.4rem;
            }
            .cta-block p {
                font-size: 0.9rem;
            }
            .cta-block .cta-btn {
                padding: 0.75rem 1.8rem;
                font-size: 0.9rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            max-width: 900px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius);
            padding: 1.2rem 1.5rem;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-100);
            box-shadow: var(--shadow-card-hover);
        }
        .faq-item .faq-q {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.3rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .faq-item .faq-q i {
            color: var(--accent);
            font-size: 0.9rem;
        }
        .faq-item .faq-a {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            padding-left: 1.4rem;
        }
        @media (max-width: 768px) {
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 4rem 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 2.5rem;
            padding-bottom: 2.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .footer-col .logo-sm {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            display: block;
            margin-bottom: 0.6rem;
        }
        .footer-col p {
            font-size: 0.88rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.65);
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 1rem;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
        }
        .footer-col ul li {
            margin-bottom: 0.5rem;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.65);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 3px;
        }
        .footer-social {
            display: flex;
            gap: 0.8rem;
            margin-top: 1rem;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.7);
            font-size: 1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem 0;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .footer-col:first-child {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Misc Utilities ===== */
        .gap-1 {
            gap: 0.25rem;
        }
        .gap-2 {
            gap: 0.5rem;
        }
        .gap-3 {
            gap: 0.75rem;
        }
        .gap-4 {
            gap: 1rem;
        }
        .gap-6 {
            gap: 1.5rem;
        }
        .mt-4 {
            margin-top: 1rem;
        }
        .mt-6 {
            margin-top: 1.5rem;
        }
        .mt-8 {
            margin-top: 2rem;
        }
        .mb-4 {
            margin-bottom: 1rem;
        }
        .mb-6 {
            margin-bottom: 1.5rem;
        }
        .mb-8 {
            margin-bottom: 2rem;
        }
        .text-center {
            text-align: center;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .inline-flex {
            display: inline-flex;
        }
        .items-center {
            align-items: center;
        }
        .me-2 {
            margin-right: 0.5rem;
        }
        .me-3 {
            margin-right: 0.75rem;
        }
        .ms-2 {
            margin-left: 0.5rem;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.85rem;
            color: var(--text-muted);
            padding: 1rem 0 0;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--text-muted);
            font-size: 0.75rem;
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }

        /* ===== Pagination ===== */
        .pagination {
            display: flex;
            justify-content: center;
            gap: 0.4rem;
            margin-top: 2.5rem;
        }
        .pagination a {
            display: flex;
            align-items: center;
            justify-content: center;
            min-width: 38px;
            height: 38px;
            border-radius: var(--radius);
            font-size: 0.88rem;
            font-weight: 500;
            background: #fff;
            color: var(--text-secondary);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .pagination a:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-50);
        }
        .pagination a.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            font-weight: 700;
        }
        .pagination a.disabled {
            opacity: 0.4;
            pointer-events: none;
        }

        /* ======== Tailwind overrides / additions ======== */
        .bg-primary-50 {
            background-color: var(--primary-50, #e8f0f8);
        }
        .text-primary {
            color: var(--primary);
        }
        .text-accent {
            color: var(--accent);
        }
        .border-primary-100 {
            border-color: #cde0f0;
        }

/* roulang page: category2 */
:root {
            --primary: #dc2626;
            --primary-dark: #b91c1c;
            --primary-light: #fef2f2;
            --accent: #1e40af;
            --accent-light: #dbeafe;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --text-main: #0f172a;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
            --shadow-md: 0 4px 14px rgba(0,0,0,0.10);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg-body);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        img { max-width: 100%; height: auto; display: block; }
        button, input { font: inherit; border: none; outline: none; transition: var(--transition); }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .container-narrow { max-width: 900px; }

        /* header */
        .site-header {
            position: sticky; top: 0; z-index: 100;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            padding: 0 20px; height: 68px;
        }
        .logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.5rem; font-weight: 800;
            color: var(--primary); letter-spacing: -0.5px;
        }
        .logo i { font-size: 1.6rem; color: var(--primary); }
        .nav-desktop { display: flex; align-items: center; gap: 6px; }
        .nav-desktop a {
            padding: 8px 18px; border-radius: 40px;
            font-size: 0.95rem; font-weight: 500;
            color: var(--text-main); transition: var(--transition);
            position: relative;
        }
        .nav-desktop a:hover { background: var(--primary-light); color: var(--primary); }
        .nav-desktop a.active {
            background: var(--primary); color: #fff;
            box-shadow: 0 2px 10px rgba(220,38,38,0.3);
        }
        .nav-desktop a.nav-cta {
            background: var(--accent); color: #fff;
            padding: 8px 22px; border-radius: 40px;
            font-weight: 600;
        }
        .nav-desktop a.nav-cta:hover { background: #1e3a8a; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(30,64,175,0.3); }

        /* hero */
        .hero-encyclopedia {
            position: relative; min-height: 420px;
            display: flex; align-items: center;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            isolation: isolate; overflow: hidden;
        }
        .hero-encyclopedia::before {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.82) 0%, rgba(30,64,175,0.55) 100%);
            z-index: 1;
        }
        .hero-encyclopedia::after {
            content: ''; position: absolute; bottom: 0; left: 0; right: 0;
            height: 80px; background: linear-gradient(to top, var(--bg-body), transparent);
            z-index: 2;
        }
        .hero-encyclopedia .hero-content { position: relative; z-index: 3; width: 100%; padding: 80px 0 60px; }
        .hero-encyclopedia h1 {
            font-size: clamp(2.6rem, 7vw, 4.2rem);
            font-weight: 900; color: #fff; line-height: 1.15;
            letter-spacing: -1px; margin-bottom: 20px;
        }
        .hero-encyclopedia h1 span { color: #fbbf24; }
        .hero-encyclopedia p {
            font-size: 1.15rem; color: rgba(255,255,255,0.88);
            max-width: 640px; line-height: 1.8;
        }
        .hero-encyclopedia .hero-tags {
            display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px;
        }
        .hero-encyclopedia .hero-tags span {
            background: rgba(255,255,255,0.15); backdrop-filter: blur(6px);
            color: #fff; padding: 6px 18px; border-radius: 30px;
            font-size: 0.85rem; font-weight: 500; border: 1px solid rgba(255,255,255,0.2);
        }

        /* section spacing */
        .section { padding: 72px 0; }
        .section-title {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            font-weight: 800; color: var(--text-main);
            letter-spacing: -0.3px; margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 1.05rem; color: var(--text-muted);
            max-width: 640px; margin-bottom: 40px;
        }
        .section-divider { width: 60px; height: 4px; background: var(--primary); border-radius: 4px; margin-bottom: 24px; }

        /* tags row */
        .tag-filter {
            display: flex; flex-wrap: wrap; gap: 10px;
            justify-content: center; margin-bottom: 48px;
        }
        .tag-filter button {
            padding: 8px 22px; border-radius: 40px;
            font-size: 0.9rem; font-weight: 500;
            background: #fff; color: var(--text-main);
            border: 1px solid var(--border-color);
            cursor: pointer; transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .tag-filter button:hover { border-color: var(--primary); color: var(--primary); }
        .tag-filter button.active {
            background: var(--primary); color: #fff;
            border-color: var(--primary); box-shadow: 0 2px 12px rgba(220,38,38,0.25);
        }

        /* cards */
        .card-grid { display: grid; gap: 28px; }
        .card-grid-3 { grid-template-columns: repeat(3, 1fr); }
        .card-grid-2 { grid-template-columns: repeat(2, 1fr); }
        .encyclopedia-card {
            background: var(--bg-card); border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm); overflow: hidden;
            transition: var(--transition); cursor: pointer;
            border: 1px solid var(--border-color);
            display: flex; flex-direction: column;
        }
        .encyclopedia-card:hover {
            transform: translateY(-6px); box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .encyclopedia-card .card-img {
            height: 200px; overflow: hidden; position: relative;
        }
        .encyclopedia-card .card-img img {
            width: 100%; height: 100%; object-fit: cover;
            transition: transform 0.5s ease;
        }
        .encyclopedia-card:hover .card-img img { transform: scale(1.06); }
        .encyclopedia-card .card-img .card-badge {
            position: absolute; top: 14px; left: 14px;
            background: var(--primary); color: #fff;
            padding: 4px 14px; border-radius: 20px;
            font-size: 0.75rem; font-weight: 600; letter-spacing: 0.3px;
        }
        .encyclopedia-card .card-body { padding: 22px 24px 24px; flex: 1; display: flex; flex-direction: column; }
        .encyclopedia-card .card-body h3 {
            font-size: 1.2rem; font-weight: 700; margin-bottom: 10px;
            color: var(--text-main); line-height: 1.4;
        }
        .encyclopedia-card .card-body p {
            font-size: 0.92rem; color: var(--text-muted);
            line-height: 1.7; flex: 1;
        }
        .encyclopedia-card .card-body .card-meta {
            display: flex; align-items: center; justify-content: space-between;
            margin-top: 16px; padding-top: 14px;
            border-top: 1px solid var(--border-color);
            font-size: 0.82rem; color: var(--text-light);
        }
        .encyclopedia-card .card-body .card-meta i { margin-right: 4px; }

        /* feature block */
        .feature-block {
            display: grid; grid-template-columns: 1fr 1fr;
            gap: 48px; align-items: center;
        }
        .feature-block .feature-text h2 { font-size: 2rem; font-weight: 800; margin-bottom: 18px; }
        .feature-block .feature-text p { color: var(--text-muted); margin-bottom: 16px; font-size: 1rem; line-height: 1.8; }
        .feature-block .feature-text ul { list-style: none; padding: 0; }
        .feature-block .feature-text ul li {
            padding: 8px 0; display: flex; align-items: center; gap: 12px;
            font-size: 0.95rem; color: var(--text-main);
        }
        .feature-block .feature-text ul li i { color: var(--primary); font-size: 1rem; width: 20px; text-align: center; }
        .feature-block .feature-img {
            border-radius: var(--radius-md); overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .feature-block .feature-img img { width: 100%; height: 400px; object-fit: cover; transition: transform 0.6s ease; }
        .feature-block .feature-img:hover img { transform: scale(1.03); }

        /* stats */
        .stats-grid {
            display: grid; grid-template-columns: repeat(4, 1fr);
            gap: 24px; text-align: center;
        }
        .stat-item {
            background: var(--bg-card); padding: 32px 20px;
            border-radius: var(--radius-md); box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .stat-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .stat-item .stat-number {
            font-size: 2.8rem; font-weight: 900; color: var(--primary);
            line-height: 1.1; margin-bottom: 6px;
        }
        .stat-item .stat-label { font-size: 0.95rem; color: var(--text-muted); font-weight: 500; }

        /* faq */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: var(--bg-card); border-radius: var(--radius-sm);
            margin-bottom: 12px; border: 1px solid var(--border-color);
            overflow: hidden; transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary); }
        .faq-question {
            display: flex; justify-content: space-between; align-items: center;
            padding: 18px 24px; cursor: pointer;
            font-weight: 600; font-size: 1rem;
            color: var(--text-main); user-select: none;
        }
        .faq-question i { transition: transform 0.3s ease; color: var(--primary); font-size: 0.85rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0; overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 400px; padding: 0 24px 20px;
        }
        .faq-answer p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.8; }

        /* cta */
        .cta-block {
            background: linear-gradient(135deg, var(--primary) 0%, #b91c1c 100%);
            border-radius: var(--radius-lg); padding: 64px 48px;
            text-align: center; color: #fff;
            box-shadow: 0 10px 40px rgba(220,38,38,0.25);
            position: relative; overflow: hidden;
        }
        .cta-block::before {
            content: ''; position: absolute; top: -50%; right: -30%;
            width: 400px; height: 400px; border-radius: 50%;
            background: rgba(255,255,255,0.04); pointer-events: none;
        }
        .cta-block h2 { font-size: 2.2rem; font-weight: 800; margin-bottom: 16px; }
        .cta-block p { font-size: 1.1rem; opacity: 0.9; max-width: 600px; margin: 0 auto 32px; }
        .cta-block .cta-btn {
            display: inline-block; background: #fff; color: var(--primary);
            padding: 14px 40px; border-radius: 60px;
            font-weight: 700; font-size: 1.05rem;
            transition: var(--transition); box-shadow: 0 4px 14px rgba(0,0,0,0.15);
        }
        .cta-block .cta-btn:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

        /* footer */
        .site-footer {
            background: #0f172a; color: rgba(255,255,255,0.8);
            padding: 56px 0 0;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-col .logo-sm { font-size: 1.4rem; font-weight: 800; color: #fff; display: block; margin-bottom: 14px; }
        .footer-col p { font-size: 0.9rem; line-height: 1.8; color: rgba(255,255,255,0.6); }
        .footer-col h4 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
        .footer-col ul { list-style: none; padding: 0; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; }
        .footer-col ul li a:hover { color: #fff; }
        .footer-social { display: flex; gap: 14px; }
        .footer-social a {
            display: flex; align-items: center; justify-content: center;
            width: 40px; height: 40px; border-radius: 50%;
            background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.7);
            font-size: 1.1rem; transition: var(--transition);
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 24px 0;
            display: flex; justify-content: space-between; align-items: center;
            flex-wrap: wrap; gap: 12px;
            font-size: 0.85rem; color: rgba(255,255,255,0.4);
        }

        /* mobile bottom nav */
        .mobile-bottom-nav {
            display: none; position: fixed; bottom: 0; left: 0; right: 0;
            z-index: 200; background: rgba(255,255,255,0.98);
            backdrop-filter: blur(14px);
            border-top: 1px solid var(--border-color);
            box-shadow: 0 -2px 10px rgba(0,0,0,0.06);
            padding: 6px 0 env(safe-area-inset-bottom, 6px);
            justify-content: space-around;
        }
        .mobile-bottom-nav a {
            display: flex; flex-direction: column; align-items: center;
            gap: 2px; padding: 6px 12px;
            font-size: 0.7rem; color: var(--text-light);
            transition: var(--transition); border-radius: 12px;
            min-width: 60px;
        }
        .mobile-bottom-nav a i { font-size: 1.3rem; }
        .mobile-bottom-nav a.active { color: var(--primary); }
        .mobile-bottom-nav a.active i { color: var(--primary); }
        .mobile-bottom-nav a:hover { color: var(--primary); background: var(--primary-light); }

        /* mobile hamburger */
        .mobile-menu-toggle { display: none; background: none; font-size: 1.6rem; color: var(--text-main); cursor: pointer; padding: 4px; }
        @media (max-width: 1024px) {
            .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
            .feature-block { gap: 32px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .mobile-menu-toggle { display: block; }
            .mobile-bottom-nav { display: flex; }
            .site-header { position: sticky; top: 0; }
            body { padding-bottom: 68px; }
            .hero-encyclopedia { min-height: 320px; }
            .hero-encyclopedia h1 { font-size: 2.2rem; }
            .hero-encyclopedia p { font-size: 1rem; }
            .card-grid-3, .card-grid-2 { grid-template-columns: 1fr; }
            .feature-block { grid-template-columns: 1fr; gap: 24px; }
            .feature-block .feature-img img { height: 260px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .stat-item .stat-number { font-size: 2rem; }
            .section { padding: 48px 0; }
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-block { padding: 40px 24px; }
            .cta-block h2 { font-size: 1.6rem; }
            .tag-filter { gap: 8px; }
            .tag-filter button { padding: 6px 16px; font-size: 0.82rem; }
            .hero-encyclopedia .hero-tags span { font-size: 0.78rem; padding: 4px 14px; }
        }
        @media (max-width: 520px) {
            .header-inner { height: 58px; }
            .logo { font-size: 1.25rem; }
            .hero-encyclopedia h1 { font-size: 1.8rem; }
            .section-title { font-size: 1.5rem; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
            .stat-item { padding: 20px 12px; }
            .stat-item .stat-number { font-size: 1.7rem; }
            .encyclopedia-card .card-img { height: 170px; }
            .encyclopedia-card .card-body { padding: 16px 18px 20px; }
            .cta-block { padding: 32px 18px; }
            .cta-block h2 { font-size: 1.4rem; }
        }

        /* mobile drawer */
        .mobile-drawer {
            display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.4); z-index: 150;
            opacity: 0; transition: opacity 0.3s ease;
        }
        .mobile-drawer.open { display: block; opacity: 1; }
        .mobile-drawer .drawer-content {
            position: absolute; top: 0; right: -280px; width: 280px; bottom: 0;
            background: #fff; padding: 24px 28px;
            transition: right 0.3s ease; box-shadow: -4px 0 20px rgba(0,0,0,0.1);
            overflow-y: auto;
        }
        .mobile-drawer.open .drawer-content { right: 0; }
        .mobile-drawer .drawer-content .drawer-header {
            display: flex; justify-content: space-between; align-items: center;
            margin-bottom: 28px;
        }
        .mobile-drawer .drawer-content .drawer-header .close-btn {
            background: none; font-size: 1.5rem; color: var(--text-muted); cursor: pointer;
        }
        .mobile-drawer .drawer-content a {
            display: block; padding: 12px 0; font-size: 1rem; font-weight: 500;
            color: var(--text-main); border-bottom: 1px solid var(--border-color);
        }
        .mobile-drawer .drawer-content a.active { color: var(--primary); }
        .mobile-drawer .drawer-content a:last-child { border-bottom: none; }
        @media (max-width: 768px) {
            .mobile-drawer.open { display: block; }
        }