/* roulang page: index */
/* ========== 设计变量 ========== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1341a8;
            --primary-light: #3b77e8;
            --primary-bg: #eef3fe;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --accent: #10b981;
            --bg-body: #ffffff;
            --bg-section: #f8fafc;
            --bg-dark: #0f172a;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 16px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ========== 基础 Reset ========== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }
        img { max-width: 100%; height: auto; display: block; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; line-height: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        h1 { font-size: 2.75rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.375rem; }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        p:last-child { margin-bottom: 0; }

        /* ========== 容器 ========== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 640px) {
            .container { padding: 0 16px; }
        }

        /* ========== 头部与导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            height: var(--header-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 640px) {
            .header-inner { padding: 0 16px; }
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }
        .logo:hover { color: var(--primary-dark); }
        .logo-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .search-toggle {
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 1.1rem;
            transition: all var(--transition);
        }
        .search-toggle:hover {
            background: var(--border-light);
            color: var(--primary);
        }
        .nav-cta {
            padding: 10px 24px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .nav-cta:hover {
            background: var(--primary-dark);
            color: var(--text-white);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .mobile-menu-btn {
            display: none;
            padding: 8px;
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-size: 1.5rem;
            background: none;
            border: none;
        }
        .mobile-menu-btn:hover { background: var(--border-light); }

        @media (max-width: 768px) {
            .main-nav { display: none; }
            .nav-right .nav-cta { display: none; }
            .mobile-menu-btn { display: flex; align-items: center; justify-content: center; }
            .main-nav.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                padding: 16px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                gap: 4px;
                z-index: 999;
            }
            .main-nav.open a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
            .main-nav.open a.active::after { display: none; }
            .main-nav.open a.active { background: var(--primary-bg); }
        }

        /* ========== 搜索条（简易） ========== */
        .search-bar {
            display: none;
            padding: 12px 0;
            background: var(--bg-body);
            border-bottom: 1px solid var(--border);
        }
        .search-bar.active { display: block; }
        .search-bar .container {
            display: flex;
            gap: 12px;
            align-items: center;
        }
        .search-bar input {
            flex: 1;
            padding: 12px 18px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            outline: none;
            transition: border var(--transition);
        }
        .search-bar input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12); }
        .search-bar button {
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: background var(--transition);
        }
        .search-bar button:hover { background: var(--primary-dark); }

        /* ========== 首屏 Hero ========== */
        .hero {
            position: relative;
            min-height: 580px;
            display: flex;
            align-items: center;
            overflow: hidden;
            background: var(--bg-dark);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            opacity: 0.35;
            transform: scale(1.02);
            transition: transform 8s ease;
        }
        .hero:hover .hero-bg { transform: scale(1.00); }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(15, 23, 42, 0.60) 100%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .hero-content {
            max-width: 680px;
            padding: 60px 0;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            border-radius: 50px;
            color: var(--text-white);
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 24px;
            border: 1px solid rgba(255, 255, 255, 0.10);
        }
        .hero-badge i { color: var(--secondary); }
        .hero h1 {
            font-size: 3.25rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero h1 span { color: var(--secondary); }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.80);
            max-width: 560px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .btn-primary, .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            border: none;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-white);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.10);
            color: var(--text-white);
            border: 1px solid rgba(255, 255, 255, 0.20);
            backdrop-filter: blur(4px);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.18);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.12);
        }
        .hero-stat-item {
            text-align: left;
        }
        .hero-stat-item .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
        }
        .hero-stat-item .label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.60);
            margin-top: 4px;
        }

        @media (max-width: 768px) {
            .hero { min-height: 480px; }
            .hero h1 { font-size: 2.25rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stat-item .num { font-size: 1.5rem; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 1.8rem; }
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn-primary, .hero-actions .btn-secondary { width: 100%; justify-content: center; }
        }

        /* ========== 板块通用 ========== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2, .section-dark h3, .section-dark .section-subtitle { color: var(--text-white); }
        .section-dark .section-subtitle { color: rgba(255, 255, 255, 0.65); }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 52px;
        }
        .section-header h2 {
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .section-header .section-badge {
            display: inline-block;
            padding: 4px 14px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        @media (max-width: 768px) {
            .section { padding: 56px 0; }
            .section-header { margin-bottom: 36px; }
        }

        /* ========== 核心说明板块 ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-body);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            margin-bottom: 20px;
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: var(--text-white);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .feature-card .feature-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 16px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--primary);
        }
        .feature-card .feature-link:hover { gap: 10px; }

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

        /* ========== 分类入口 ========== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .category-card {
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border);
            background: var(--bg-body);
            transition: all var(--transition);
            position: relative;
            display: block;
            color: var(--text-primary);
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            color: var(--text-primary);
        }
        .category-card .cat-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            display: block;
        }
        .category-card .cat-body {
            padding: 20px 18px 22px;
        }
        .category-card .cat-body h4 {
            font-size: 1.05rem;
            margin-bottom: 6px;
            font-weight: 600;
        }
        .category-card .cat-body p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .category-card .cat-tag {
            display: inline-block;
            padding: 2px 10px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
            margin-top: 10px;
        }

        @media (max-width: 1024px) {
            .category-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .category-grid { grid-template-columns: 1fr; }
        }

        /* ========== 资讯 / 内容列表 ========== */
        .post-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .post-card {
            display: flex;
            gap: 20px;
            background: var(--bg-body);
            border-radius: var(--radius-md);
            padding: 20px;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .post-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
            transform: translateY(-2px);
        }
        .post-card .post-thumb {
            width: 140px;
            min-height: 100px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .post-card .post-info { flex: 1; }
        .post-card .post-cat {
            display: inline-block;
            padding: 2px 10px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
            margin-bottom: 8px;
        }
        .post-card .post-info h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            font-weight: 600;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .post-info h4 a { color: var(--text-primary); }
        .post-card .post-info h4 a:hover { color: var(--primary); }
        .post-card .post-excerpt {
            font-size: 0.9rem;
            color: var(--text-secondary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 8px;
        }
        .post-card .post-meta {
            font-size: 0.82rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .post-card .post-meta i { margin-right: 4px; }
        .empty-posts {
            grid-column: 1 / -1;
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 1rem;
            background: var(--bg-section);
            border-radius: var(--radius-md);
        }

        @media (max-width: 768px) {
            .post-list { grid-template-columns: 1fr; }
            .post-card { flex-direction: column; }
            .post-card .post-thumb { width: 100%; height: 180px; }
        }

        /* ========== 数据 / 流程板块 ========== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-body);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            position: relative;
            transition: all var(--transition);
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: 0 0 0 4px var(--bg-section);
        }
        .step-item .step-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 16px;
            margin-top: 8px;
        }
        .step-item h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        @media (max-width: 1024px) {
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .steps-grid { grid-template-columns: 1fr; }
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-primary);
            background: var(--bg-body);
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--border-light); }
        .faq-question i {
            font-size: 1.2rem;
            color: var(--text-muted);
            transition: transform var(--transition);
        }
        .faq-item.active .faq-question i { transform: rotate(180deg); color: var(--primary); }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.35s ease;
            background: var(--bg-body);
        }
        .faq-item.active .faq-answer {
            padding: 0 24px 20px;
            max-height: 300px;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
        }
        .cta-section h2 {
            color: var(--text-white);
            font-size: 2rem;
            margin-bottom: 12px;
            position: relative;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 28px;
            position: relative;
        }
        .cta-section .btn-primary {
            background: var(--text-white);
            color: var(--primary);
            position: relative;
        }
        .cta-section .btn-primary:hover {
            background: var(--secondary);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .cta-section .btn-secondary {
            border-color: rgba(255, 255, 255, 0.30);
            color: var(--text-white);
        }
        .cta-section .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.15);
        }

        @media (max-width: 640px) {
            .cta-section { padding: 40px 24px; }
            .cta-section h2 { font-size: 1.5rem; }
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--bg-dark);
            padding: 60px 0 32px;
            color: rgba(255, 255, 255, 0.70);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            padding: 4px 0;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.60);
            transition: color var(--transition);
        }
        .footer-col a:hover { color: var(--text-white); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a { color: rgba(255, 255, 255, 0.55); }
        .footer-bottom a:hover { color: var(--text-white); }

        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ========== 工具类 ========== */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mb-12 { margin-bottom: 12px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-8 { gap: 8px; }
        .gap-16 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .flex-wrap { flex-wrap: wrap; }

        /* ========== Back to Top ========== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            opacity: 0;
            visibility: hidden;
            transition: all var(--transition);
            z-index: 999;
            border: none;
        }
        .back-top.visible { opacity: 1; visibility: visible; }
        .back-top:hover { background: var(--primary-dark); transform: translateY(-4px); }

        @media (max-width: 520px) {
            .back-top { bottom: 16px; right: 16px; width: 42px; height: 42px; font-size: 1rem; }
        }

        /* ========== 响应式微调 ========== */
        @media (max-width: 1024px) {
            h1 { font-size: 2.25rem; }
            h2 { font-size: 1.65rem; }
        }
        @media (max-width: 520px) {
            h1 { font-size: 1.6rem; }
            h2 { font-size: 1.35rem; }
            .section-header .section-badge { font-size: 0.7rem; }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #0f3a8c;
            --primary-bg: #eef2ff;
            --secondary: #f59e0b;
            --secondary-light: #fbbf24;
            --secondary-dark: #d97706;
            --accent: #8b5cf6;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }

        /* ===== Container ===== */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 22px;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .logo:hover { color: var(--primary); }
        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-xs);
            font-weight: 800;
            font-size: 20px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 15px;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            box-shadow: 0 2px 8px rgba(26,86,219,0.25);
        }
        .nav-cta:hover {
            background: var(--primary-dark) !important;
            box-shadow: 0 4px 16px rgba(26,86,219,0.35);
            transform: translateY(-1px);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 28px;
            color: var(--text);
            cursor: pointer;
            padding: 4px;
        }
        @media (max-width: 900px) {
            .nav-toggle { display: block; }
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 20px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
            }
            .main-nav a.active::after { display: none; }
            .nav-cta { text-align: center; margin-top: 6px; }
        }
        @media (max-width: 520px) {
            .logo { font-size: 18px; }
            .logo-icon { width: 32px; height: 32px; font-size: 16px; }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 20px 0 8px;
            font-size: 14px;
            color: var(--text-muted);
        }
        .breadcrumb a { color: var(--text-secondary); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb span { color: var(--text-muted); margin: 0 6px; }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: 60px 0 70px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            border-radius: 0 0 var(--radius) var(--radius);
            margin-bottom: 60px;
            overflow: hidden;
            min-height: 260px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .page-banner h1 {
            font-size: 42px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }
        .page-banner p {
            font-size: 18px;
            color: rgba(255,255,255,0.85);
            max-width: 640px;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .page-banner { padding: 40px 0 50px; min-height: 200px; }
            .page-banner h1 { font-size: 28px; }
            .page-banner p { font-size: 16px; }
        }
        @media (max-width: 520px) {
            .page-banner h1 { font-size: 24px; }
            .page-banner p { font-size: 15px; }
        }

        /* ===== Section Common ===== */
        .section {
            padding: 60px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-secondary);
            font-size: 17px;
            max-width: 680px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            .section { padding: 40px 0; }
            .section-title { font-size: 26px; }
            .section-subtitle { font-size: 15px; margin-bottom: 32px; }
        }

        /* ===== Cards Grid ===== */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        @media (max-width: 1024px) {
            .cards-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 640px) {
            .cards-grid { grid-template-columns: 1fr; }
        }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 24px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            box-shadow: var(--shadow);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-bg);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 18px;
        }
        .card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }
        .card .badge {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 20px;
            margin-top: 14px;
        }

        /* ===== Step / Timeline ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            padding: 28px 20px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            text-align: center;
            position: relative;
            transition: all var(--transition);
        }
        .step-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 16px;
        }
        .step-item h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-item p {
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .steps-grid { grid-template-columns: 1fr; }
        }

        /* ===== Content List ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-item {
            display: flex;
            align-items: flex-start;
            gap: 18px;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .content-item:hover {
            border-color: var(--primary-bg);
            box-shadow: var(--shadow);
        }
        .content-item .num {
            font-weight: 700;
            font-size: 20px;
            color: var(--primary);
            min-width: 36px;
        }
        .content-item .text h4 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .content-item .text p {
            color: var(--text-secondary);
            font-size: 14px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-bg);
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--bg-alt);
        }
        .faq-question i {
            font-size: 18px;
            color: var(--text-muted);
            transition: transform 0.3s ease;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            padding: 64px 0;
            text-align: center;
            border-radius: var(--radius);
            margin: 20px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255,255,255,0.85);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-btn {
            display: inline-block;
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            font-size: 17px;
            padding: 14px 40px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(0,0,0,0.15);
        }
        .cta-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 32px rgba(0,0,0,0.25);
            background: #f8fafc;
            color: var(--primary-dark);
        }
        @media (max-width: 768px) {
            .cta-section { padding: 44px 0; }
            .cta-section h2 { font-size: 26px; }
            .cta-section p { font-size: 16px; }
            .cta-btn { padding: 12px 32px; font-size: 16px; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
            margin-top: 60px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 20px;
            margin-bottom: 14px;
        }
        .footer-brand .logo .logo-icon {
            background: var(--primary-light);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h5 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.6);
            font-size: 14px;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        @media (max-width: 900px) {
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 640px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Tags ===== */
        .tags-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 12px;
        }
        .tag {
            display: inline-block;
            background: var(--bg-card);
            border: 1px solid var(--border);
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-bg);
        }

        /* ===== Data Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }
        .stat-item {
            background: var(--bg-card);
            padding: 28px 16px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
        }
        .stat-item .number {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-item .label {
            color: var(--text-secondary);
            font-size: 14px;
            margin-top: 6px;
        }
        @media (max-width: 768px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .stat-item .number { font-size: 28px; }
        }

        /* ===== Image & Media ===== */
        .img-card {
            border-radius: var(--radius-sm);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
        }
        .img-card:hover {
            box-shadow: var(--shadow-hover);
        }
        .img-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .img-card:hover img {
            transform: scale(1.03);
        }

        /* ===== Two Column ===== */
        .two-col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        @media (max-width: 768px) {
            .two-col { grid-template-columns: 1fr; gap: 24px; }
        }
        .two-col .text-col h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .two-col .text-col p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .two-col .img-col img {
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            width: 100%;
            height: auto;
        }

        /* ===== Additional Utilities ===== */
        .text-center { text-align: center; }
        .mt-20 { margin-top: 20px; }
        .mb-20 { margin-bottom: 20px; }
        .gap-16 { gap: 16px; }

        /* ===== Responsive fine-tune ===== */
        @media (max-width: 1024px) {
            .two-col .text-col h2 { font-size: 26px; }
        }
        @media (max-width: 520px) {
            .section-title { font-size: 22px; }
            .content-item { padding: 14px 16px; flex-wrap: wrap; }
            .content-item .num { font-size: 18px; min-width: 28px; }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
:root {
    --primary: #1a2a4a;
    --primary-light: #2a3f6a;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-light: #dbeafe;
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-soft: #f1f5f9;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --border-focus: #2563eb;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
    --shadow-nav: 0 2px 16px rgba(0,0,0,0.05);
    --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    --max-width: 1200px;
    --content-width: 800px;
}

/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:var(--accent);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--accent-hover)}
img{max-width:100%;height:auto;display:block}
button,input,textarea,select{font-family:inherit;font-size:inherit}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{line-height:1.3;font-weight:700;color:var(--primary)}
h1{font-size:clamp(1.75rem,4vw,2.75rem)}
h2{font-size:clamp(1.5rem,3vw,2.25rem)}
h3{font-size:clamp(1.2rem,2vw,1.5rem)}
h4{font-size:1.2rem}
p{margin-bottom:1rem;color:var(--text)}
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 20px}
.section{padding:clamp(2.5rem,6vw,5rem) 0}
.section-title{text-align:center;margin-bottom:clamp(2rem,4vw,3.5rem)}
.section-title h2{position:relative;display:inline-block;margin-bottom:0.75rem}
.section-title h2::after{content:'';display:block;width:60px;height:4px;background:var(--accent);border-radius:2px;margin:0.5rem auto 0}
.section-title p{color:var(--text-secondary);font-size:1.1rem;max-width:600px;margin:0 auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ===== Header & Navigation ===== */
.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,0.96);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);box-shadow:var(--shadow-nav)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-size:1.35rem;font-weight:800;color:var(--primary);letter-spacing:-0.3px;white-space:nowrap}
.logo .logo-icon{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;background:var(--accent);color:#fff;border-radius:var(--radius-sm);font-size:1.2rem;font-weight:800}
.logo:hover{color:var(--accent)}
.main-nav{display:flex;align-items:center;gap:4px;flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.main-nav::-webkit-scrollbar{display:none}
.main-nav a{display:inline-flex;align-items:center;padding:8px 18px;border-radius:var(--radius-sm);font-size:0.95rem;font-weight:500;color:var(--text-secondary);transition:all var(--transition);white-space:nowrap;position:relative}
.main-nav a:hover{color:var(--accent);background:var(--accent-light)}
.main-nav a.active{color:var(--accent);background:var(--accent-light);font-weight:600}
.main-nav a.active::after{content:'';position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:20px;height:3px;background:var(--accent);border-radius:2px}
.nav-actions{display:flex;align-items:center;gap:12px;flex-shrink:0}
.search-toggle{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;border:none;background:var(--bg-soft);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);font-size:1rem}
.search-toggle:hover{background:var(--accent-light);color:var(--accent)}
.mobile-toggle{display:none;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-sm);border:none;background:var(--bg-soft);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);font-size:1.25rem}
.mobile-toggle:hover{background:var(--accent-light);color:var(--accent)}
@media(max-width:768px){
    .main-nav{position:fixed;top:68px;left:0;right:0;background:rgba(255,255,255,0.98);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);flex-direction:column;padding:16px 20px;gap:6px;border-bottom:1px solid var(--border);box-shadow:var(--shadow);transform:translateY(-120%);opacity:0;pointer-events:none;transition:all 0.35s cubic-bezier(0.4,0,0.2,1);overflow-y:auto;max-height:calc(100vh - 68px)}
    .main-nav.open{transform:translateY(0);opacity:1;pointer-events:all}
    .main-nav a{width:100%;padding:12px 16px;font-size:1.05rem}
    .mobile-toggle{display:inline-flex}
    .nav-actions .search-toggle{display:none}
}
@media(min-width:769px){
    .main-nav{display:flex!important;transform:none!important;opacity:1!important;pointer-events:all!important;position:static!important;background:transparent!important;backdrop-filter:none!important;box-shadow:none!important;padding:0!important;border:none!important;max-height:none!important}
}
/* Search Bar */
.search-bar{display:none;padding:12px 0 16px;border-bottom:1px solid var(--border);background:var(--bg)}
.search-bar.active{display:block}
.search-bar .search-form{display:flex;gap:12px;max-width:600px;margin:0 auto}
.search-bar input{flex:1;padding:12px 18px;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:1rem;outline:none;transition:border var(--transition);background:#fff}
.search-bar input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px rgba(37,99,235,0.12)}
.search-bar button{padding:12px 28px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-weight:600;cursor:pointer;transition:background var(--transition)}
.search-bar button:hover{background:var(--accent-hover)}

/* ===== Article Banner ===== */
.article-banner{position:relative;background:var(--primary);min-height:320px;display:flex;align-items:center;overflow:hidden}
.article-banner .banner-bg{position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;opacity:0.2;mix-blend-mode:overlay}
.article-banner .banner-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(26,42,74,0.88) 0%,rgba(37,99,235,0.55) 100%)}
.article-banner .container{position:relative;z-index:2;padding:clamp(2.5rem,5vw,4rem) 20px}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;font-size:0.9rem;color:rgba(255,255,255,0.7);margin-bottom:1.5rem}
.breadcrumb a{color:rgba(255,255,255,0.8);transition:color var(--transition)}
.breadcrumb a:hover{color:#fff}
.breadcrumb .sep{color:rgba(255,255,255,0.4)}
.banner-meta{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:1.25rem;font-size:0.95rem;color:rgba(255,255,255,0.85)}
.banner-meta .cat-tag{display:inline-block;padding:4px 16px;background:rgba(255,255,255,0.18);border-radius:20px;font-size:0.85rem;font-weight:500;color:#fff;backdrop-filter:blur(4px)}
.banner-meta i{margin-right:6px;opacity:0.7}
.article-banner h1{color:#fff;font-size:clamp(1.6rem,3.5vw,2.6rem);max-width:860px;line-height:1.35;text-shadow:0 2px 12px rgba(0,0,0,0.15)}

/* ===== Article Main Content ===== */
.article-main{padding:clamp(2rem,4vw,3.5rem) 0}
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:40px;align-items:start}
.article-body{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:clamp(1.5rem,3vw,2.5rem);overflow:hidden}
.article-body .featured-image{margin:-2.5rem -2.5rem 2rem -2.5rem;max-height:480px;overflow:hidden;border-radius:var(--radius-lg) var(--radius-lg) 0 0}
.article-body .featured-image img{width:100%;height:100%;object-fit:cover}
.article-body .post-content{font-size:1.1rem;line-height:1.9;color:var(--text)}
.article-body .post-content p{margin-bottom:1.25rem}
.article-body .post-content h2,.article-body .post-content h3{margin-top:2rem;margin-bottom:1rem;color:var(--primary)}
.article-body .post-content ul,.article-body .post-content ol{padding-left:1.5rem;margin-bottom:1.25rem}
.article-body .post-content li{margin-bottom:0.5rem;list-style:disc}
.article-body .post-content ol li{list-style:decimal}
.article-body .post-content blockquote{border-left:4px solid var(--accent);padding:1rem 1.5rem;margin:1.5rem 0;background:var(--bg-soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-style:italic;color:var(--text-secondary)}
.article-body .post-content a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.article-body .post-content img{border-radius:var(--radius-sm);margin:1.5rem 0;box-shadow:var(--shadow)}
.post-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--border)}
.post-tags .tag{display:inline-block;padding:6px 16px;background:var(--bg-soft);border-radius:20px;font-size:0.85rem;color:var(--text-secondary);transition:all var(--transition)}
.post-tags .tag:hover{background:var(--accent-light);color:var(--accent)}
.post-share{display:flex;align-items:center;gap:12px;margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid var(--border)}
.post-share span{font-weight:600;color:var(--text-secondary);font-size:0.95rem}
.post-share a{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;background:var(--bg-soft);color:var(--text-secondary);transition:all var(--transition);font-size:1rem}
.post-share a:hover{background:var(--accent);color:#fff}
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--border)}
.post-nav a{display:flex;flex-direction:column;padding:1rem 1.25rem;border-radius:var(--radius-sm);background:var(--bg-soft);transition:all var(--transition);gap:4px}
.post-nav a:hover{background:var(--accent-light);transform:translateY(-2px)}
.post-nav a .nav-label{font-size:0.85rem;color:var(--text-light);font-weight:500}
.post-nav a .nav-title{font-size:0.95rem;font-weight:600;color:var(--primary);line-height:1.4}
.post-nav a.next{text-align:right}

/* ===== Sidebar ===== */
.article-sidebar{display:flex;flex-direction:column;gap:28px}
.sidebar-card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.5rem}
.sidebar-card h4{font-size:1.1rem;margin-bottom:1rem;color:var(--primary);padding-bottom:0.75rem;border-bottom:2px solid var(--accent-light)}
.sidebar-card .side-list{display:flex;flex-direction:column;gap:12px}
.sidebar-card .side-list a{display:flex;gap:12px;align-items:flex-start;padding:8px 0;border-bottom:1px solid var(--border);transition:all var(--transition)}
.sidebar-card .side-list a:last-child{border-bottom:none}
.sidebar-card .side-list a:hover{transform:translateX(4px)}
.sidebar-card .side-list .side-img{width:64px;height:48px;border-radius:6px;object-fit:cover;flex-shrink:0;background:var(--bg-soft)}
.sidebar-card .side-list .side-text{flex:1}
.sidebar-card .side-list .side-text .side-title{font-size:0.9rem;font-weight:600;color:var(--text);line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.sidebar-card .side-list .side-text .side-date{font-size:0.8rem;color:var(--text-light);margin-top:4px}
.sidebar-cta{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:var(--radius);padding:1.75rem;text-align:center}
.sidebar-cta h4{color:#fff;border-bottom:none;padding-bottom:0;margin-bottom:0.5rem}
.sidebar-cta p{color:rgba(255,255,255,0.85);font-size:0.95rem;margin-bottom:1.25rem}
.sidebar-cta .btn-cta{display:inline-block;padding:10px 28px;background:#fff;color:var(--accent);border-radius:var(--radius-sm);font-weight:600;transition:all var(--transition)}
.sidebar-cta .btn-cta:hover{background:var(--bg-soft);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,0.15)}

/* ===== Related Articles ===== */
.related-section{background:var(--bg)}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.related-card{background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:all var(--transition);display:flex;flex-direction:column}
.related-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.related-card .card-img{height:180px;overflow:hidden;background:var(--bg-soft)}
.related-card .card-img img{width:100%;height:100%;object-fit:cover;transition:transform 0.5s ease}
.related-card:hover .card-img img{transform:scale(1.05)}
.related-card .card-body{padding:1.25rem;flex:1;display:flex;flex-direction:column;gap:8px}
.related-card .card-body .card-cat{font-size:0.8rem;color:var(--accent);font-weight:600;text-transform:uppercase;letter-spacing:0.5px}
.related-card .card-body h3{font-size:1.05rem;font-weight:600;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-card .card-body p{font-size:0.9rem;color:var(--text-secondary);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1}
.related-card .card-body .card-meta{font-size:0.85rem;color:var(--text-light);margin-top:auto;padding-top:8px}

/* ===== FAQ ===== */
.faq-section{background:var(--bg-card)}
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all var(--transition)}
.faq-item:hover{border-color:var(--accent-light)}
.faq-question{display:flex;align-items:center;justify-content:space-between;padding:1.1rem 1.5rem;cursor:pointer;background:var(--bg);font-weight:600;color:var(--text);transition:all var(--transition);border:none;width:100%;text-align:left;font-size:1rem;gap:12px}
.faq-question:hover{background:var(--accent-light);color:var(--accent)}
.faq-question i{font-size:0.85rem;color:var(--text-light);transition:transform var(--transition)}
.faq-item.active .faq-question i{transform:rotate(180deg);color:var(--accent)}
.faq-answer{padding:0 1.5rem;max-height:0;overflow:hidden;transition:all 0.35s ease;background:var(--bg-card)}
.faq-item.active .faq-answer{max-height:300px;padding:0 1.5rem 1.25rem}
.faq-answer p{color:var(--text-secondary);font-size:0.95rem;margin-bottom:0}

/* ===== CTA ===== */
.cta-section{background:linear-gradient(135deg,var(--primary) 0%,#0f1d3a 100%);position:relative;overflow:hidden;text-align:center}
.cta-section::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-3.png') center/cover no-repeat;opacity:0.08;mix-blend-mode:overlay}
.cta-section .container{position:relative;z-index:2}
.cta-section h2{color:#fff;margin-bottom:1rem}
.cta-section p{color:rgba(255,255,255,0.85);max-width:600px;margin:0 auto 2rem;font-size:1.1rem}
.cta-buttons{display:flex;flex-wrap:wrap;gap:16px;justify-content:center}
.cta-buttons .btn-primary{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;background:#fff;color:var(--primary);border-radius:var(--radius-sm);font-weight:700;font-size:1.05rem;transition:all var(--transition);border:none;cursor:pointer}
.cta-buttons .btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(0,0,0,0.25);background:var(--bg-soft)}
.cta-buttons .btn-secondary{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;background:transparent;color:#fff;border:2px solid rgba(255,255,255,0.35);border-radius:var(--radius-sm);font-weight:600;font-size:1.05rem;transition:all var(--transition);cursor:pointer}
.cta-buttons .btn-secondary:hover{background:rgba(255,255,255,0.12);border-color:rgba(255,255,255,0.6);transform:translateY(-3px)}

/* ===== Not Found ===== */
.not-found-wrap{text-align:center;padding:clamp(3rem,8vw,6rem) 20px;min-height:50vh;display:flex;flex-direction:column;align-items:center;justify-content:center}
.not-found-wrap .nf-icon{font-size:4rem;color:var(--text-light);margin-bottom:1rem}
.not-found-wrap h2{font-size:2rem;margin-bottom:0.75rem}
.not-found-wrap p{color:var(--text-secondary);font-size:1.1rem;margin-bottom:2rem}
.not-found-wrap .btn-home{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;background:var(--accent);color:#fff;border-radius:var(--radius-sm);font-weight:600;transition:all var(--transition)}
.not-found-wrap .btn-home:hover{background:var(--accent-hover);transform:translateY(-2px);box-shadow:0 8px 24px rgba(37,99,235,0.25)}

/* ===== Footer (shared) ===== */
.site-footer{background:var(--primary);color:rgba(255,255,255,0.8);padding:clamp(2.5rem,5vw,4rem) 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:clamp(1.5rem,3vw,2.5rem);padding-bottom:2rem;border-bottom:1px solid rgba(255,255,255,0.1)}
.footer-brand .logo{color:#fff;font-size:1.4rem;margin-bottom:1rem;display:inline-flex}
.footer-brand .logo .logo-icon{background:#fff;color:var(--primary)}
.footer-brand p{font-size:0.95rem;line-height:1.7;color:rgba(255,255,255,0.65);max-width:360px}
.footer-col h5{color:#fff;font-size:1rem;font-weight:700;margin-bottom:1.25rem;letter-spacing:0.3px}
.footer-col a{display:block;padding:4px 0;font-size:0.9rem;color:rgba(255,255,255,0.65);transition:all var(--transition)}
.footer-col a:hover{color:#fff;padding-left:6px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;padding:1.5rem 0;gap:12px;font-size:0.85rem;color:rgba(255,255,255,0.5)}
.footer-bottom a{color:rgba(255,255,255,0.6);transition:color var(--transition)}
.footer-bottom a:hover{color:#fff}
@media(max-width:768px){
    .footer-grid{grid-template-columns:1fr 1fr}
    .footer-brand{grid-column:1/-1}
    .article-layout{grid-template-columns:1fr}
    .post-nav{grid-template-columns:1fr}
}
@media(max-width:520px){
    .footer-grid{grid-template-columns:1fr}
    .footer-bottom{flex-direction:column;text-align:center}
    .article-body{padding:1.25rem}
    .article-body .featured-image{margin:-1.25rem -1.25rem 1.25rem -1.25rem}
}

/* ===== Utility ===== */
.text-center{text-align:center}
.mt-1{margin-top:1rem}
.mt-2{margin-top:2rem}
.mb-1{margin-bottom:1rem}
.mb-2{margin-bottom:2rem}
.gap-1{gap:1rem}
.flex-center{display:flex;align-items:center;justify-content:center}