/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --clr-primary: #0f1a2e;
            --clr-primary-light: #1a3a5c;
            --clr-accent: #3b82f6;
            --clr-accent-hover: #2563eb;
            --clr-accent-soft: #dbeafe;
            --clr-emerald: #06b6d4;
            --clr-emerald-hover: #0891b2;
            --clr-bg: #f0f4f8;
            --clr-bg-alt: #e6edf5;
            --clr-card: #ffffff;
            --clr-text: #0f1a2e;
            --clr-text-secondary: #64748b;
            --clr-text-light: #94a3b8;
            --clr-border: #e2e8f0;
            --clr-border-light: #f1f5f9;
            --clr-success: #10b981;
            --clr-warning: #f59e0b;
            --clr-danger: #ef4444;
            --shadow-sm: 0 1px 3px rgba(15, 26, 46, 0.06), 0 1px 2px rgba(15, 26, 46, 0.04);
            --shadow-md: 0 4px 12px rgba(15, 26, 46, 0.08), 0 2px 4px rgba(15, 26, 46, 0.04);
            --shadow-lg: 0 12px 36px rgba(15, 26, 46, 0.10), 0 4px 12px rgba(15, 26, 46, 0.06);
            --shadow-xl: 0 24px 48px rgba(15, 26, 46, 0.12);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --sidebar-width: 240px;
            --header-height: 64px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            font-family: var(--font-sans);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--clr-accent); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--clr-accent-hover); }
        a:focus-visible { outline: 2px solid var(--clr-accent); outline-offset: 2px; border-radius: var(--radius-sm); }
        button, input, textarea, select { font-family: inherit; font-size: 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(--clr-text); }
        h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); letter-spacing: -0.02em; }
        h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -0.01em; }
        h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
        h4 { font-size: 1.125rem; }
        p { margin-bottom: 1rem; color: var(--clr-text-secondary); }
        p:last-child { margin-bottom: 0; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        .container-narrow { max-width: 960px; margin: 0 auto; padding: 0 24px; }

        /* ===== 左侧竖向导航 ===== */
        .app-layout { display: flex; min-height: 100vh; }

        .sidebar {
            position: fixed; top: 0; left: 0; bottom: 0;
            width: var(--sidebar-width);
            background: var(--clr-primary);
            color: #fff;
            display: flex; flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
            border-right: 1px solid rgba(255,255,255,0.06);
        }
        .sidebar-brand {
            padding: 24px 20px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            flex-shrink: 0;
        }
        .sidebar-brand .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-brand .logo i {
            color: var(--clr-emerald);
            font-size: 1.5rem;
        }
        .sidebar-brand .logo span { background: linear-gradient(135deg, #fff 60%, var(--clr-emerald)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .sidebar-brand .sub { font-size: 0.75rem; color: rgba(255,255,255,0.5); margin-top: 4px; letter-spacing: 0.3px; padding-left: 2px; }

        .sidebar-nav { flex: 1; padding: 16px 12px; }
        .sidebar-nav .nav-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: rgba(255,255,255,0.35); padding: 12px 12px 6px; font-weight: 600; }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-size: 0.9rem;
            font-weight: 500;
            transition: all var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i { width: 20px; text-align: center; font-size: 0.95rem; color: rgba(255,255,255,0.4); transition: color var(--transition); }
        .sidebar-nav a:hover { background: rgba(255,255,255,0.08); color: #fff; }
        .sidebar-nav a:hover i { color: var(--clr-emerald); }
        .sidebar-nav a.active { background: rgba(59,130,246,0.2); color: #fff; }
        .sidebar-nav a.active i { color: var(--clr-accent); }
        .sidebar-nav a:focus-visible { outline: 2px solid var(--clr-accent); outline-offset: 2px; }

        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
            flex-shrink: 0;
        }
        .sidebar-footer .social-links { display: flex; gap: 12px; }
        .sidebar-footer .social-links a { color: rgba(255,255,255,0.4); font-size: 1rem; transition: color var(--transition); }
        .sidebar-footer .social-links a:hover { color: #fff; }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            background: var(--clr-bg);
        }

        /* ===== 移动端顶部栏 ===== */
        .mobile-header {
            display: none;
            position: sticky; top: 0; left: 0; right: 0;
            height: var(--header-height);
            background: var(--clr-primary);
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            z-index: 999;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .mobile-header .logo { color: #fff; font-size: 1.2rem; font-weight: 800; display: flex; align-items: center; gap: 8px; }
        .mobile-header .logo i { color: var(--clr-emerald); font-size: 1.3rem; }
        .mobile-header .logo span { background: linear-gradient(135deg, #fff 60%, var(--clr-emerald)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .mobile-menu-btn { color: #fff; font-size: 1.4rem; padding: 8px; border-radius: var(--radius-sm); transition: background var(--transition); }
        .mobile-menu-btn:hover { background: rgba(255,255,255,0.1); }

        /* ===== 遮罩 ===== */
        .sidebar-overlay {
            display: none;
            position: fixed; inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .sidebar-overlay.active { opacity: 1; }

        /* ===== 板块通用 ===== */
        .section { padding: 80px 0; }
        .section-alt { background: var(--clr-bg-alt); }
        .section-dark {
            background: var(--clr-primary);
            color: #fff;
        }
        .section-dark h2, .section-dark h3, .section-dark .section-title { color: #fff; }
        .section-dark .section-subtitle { color: rgba(255,255,255,0.7); }
        .section-dark p { color: rgba(255,255,255,0.75); }
        .section-title {
            font-size: clamp(1.6rem, 3.5vw, 2.2rem);
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--clr-text-secondary);
            max-width: 640px;
            margin: 0 auto 48px;
            text-align: center;
        }
        .section-header { text-align: center; margin-bottom: 48px; }
        .section-header .section-title { margin-bottom: 12px; }
        .section-header .section-subtitle { margin-bottom: 0; }

        /* ===== Hero ===== */
        .hero {
            padding: 100px 0 80px;
            background: linear-gradient(135deg, var(--clr-primary) 0%, #162a4a 60%, #1a3a5c 100%);
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -40%; right: -20%;
            width: 600px; height: 600px;
            background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%; left: -10%;
            width: 400px; height: 400px;
            background: radial-gradient(circle, rgba(6,182,212,0.10) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero .container { position: relative; z-index: 1; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255,255,255,0.10);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255,255,255,0.15);
            padding: 6px 16px 6px 10px;
            border-radius: 100px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.85);
            margin-bottom: 24px;
        }
        .hero-badge i { color: var(--clr-emerald); font-size: 0.75rem; }
        .hero h1 {
            font-size: clamp(2.4rem, 6vw, 4rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 20px;
            color: #fff;
        }
        .hero h1 .highlight { background: linear-gradient(135deg, var(--clr-accent), var(--clr-emerald)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            font-size: clamp(1.05rem, 1.8vw, 1.2rem);
            color: rgba(255,255,255,0.75);
            max-width: 600px;
            margin-bottom: 36px;
            line-height: 1.8;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
        .hero-metrics {
            display: flex; flex-wrap: wrap; gap: 40px;
            margin-top: 56px;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.10);
        }
        .hero-metric .num { font-size: 2rem; font-weight: 800; color: #fff; letter-spacing: -0.02em; }
        .hero-metric .num i { color: var(--clr-emerald); font-size: 1.4rem; margin-right: 6px; }
        .hero-metric .label { font-size: 0.85rem; color: rgba(255,255,255,0.55); margin-top: 2px; }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn:focus-visible { outline: 2px solid var(--clr-accent); outline-offset: 2px; }
        .btn-primary { background: var(--clr-accent); color: #fff; border-color: var(--clr-accent); }
        .btn-primary:hover { background: var(--clr-accent-hover); border-color: var(--clr-accent-hover); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .btn-primary:active { transform: translateY(0); }
        .btn-outline-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.3); }
        .btn-outline-light:hover { background: rgba(255,255,255,0.10); border-color: rgba(255,255,255,0.5); color: #fff; transform: translateY(-2px); }
        .btn-outline-light:active { transform: translateY(0); }
        .btn-outline-primary { background: transparent; color: var(--clr-accent); border-color: var(--clr-accent); }
        .btn-outline-primary:hover { background: var(--clr-accent); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .btn-outline-primary:active { transform: translateY(0); }
        .btn-emerald { background: var(--clr-emerald); color: #fff; border-color: var(--clr-emerald); }
        .btn-emerald:hover { background: var(--clr-emerald-hover); border-color: var(--clr-emerald-hover); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .btn-emerald:active { transform: translateY(0); }
        .btn-lg { padding: 16px 36px; font-size: 1.05rem; border-radius: var(--radius-md); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; border-radius: var(--radius-sm); }

        /* ===== 卡片 ===== */
        .card {
            background: var(--clr-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .card-body { padding: 28px; }
        .card-body.compact { padding: 20px; }
        .card-icon { width: 48px; height: 48px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 1.4rem; margin-bottom: 16px; color: #fff; }
        .card-icon.blue { background: var(--clr-accent); }
        .card-icon.emerald { background: var(--clr-emerald); }
        .card-icon.purple { background: #8b5cf6; }
        .card-icon.amber { background: var(--clr-warning); }
        .card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
        .card-text { font-size: 0.92rem; color: var(--clr-text-secondary); line-height: 1.7; }
        .card-link { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 0.9rem; margin-top: 12px; color: var(--clr-accent); transition: gap var(--transition); }
        .card-link:hover { gap: 10px; color: var(--clr-accent-hover); }

        /* ===== 分类卡片网格 ===== */
        .category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .category-card {
            background: var(--clr-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--clr-border);
            padding: 32px 28px;
            transition: all var(--transition);
            text-align: center;
        }
        .category-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-6px); border-color: var(--clr-accent); }
        .category-card .icon { width: 64px; height: 64px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin: 0 auto 18px; color: #fff; }
        .category-card .icon.blue { background: linear-gradient(135deg, var(--clr-accent), #60a5fa); }
        .category-card .icon.emerald { background: linear-gradient(135deg, var(--clr-emerald), #34d399); }
        .category-card .icon.purple { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
        .category-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
        .category-card p { font-size: 0.9rem; color: var(--clr-text-secondary); margin-bottom: 16px; }
        .category-card .btn { margin-top: 4px; }

        /* ===== 资讯列表 ===== */
        .post-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
        .post-card {
            background: var(--clr-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--clr-border);
            padding: 28px;
            transition: all var(--transition);
        }
        .post-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
        .post-card .meta { display: flex; align-items: center; gap: 12px; font-size: 0.8rem; color: var(--clr-text-light); margin-bottom: 10px; flex-wrap: wrap; }
        .post-card .meta .tag {
            display: inline-block;
            padding: 2px 10px;
            border-radius: 100px;
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            background: var(--clr-accent-soft);
            color: var(--clr-accent);
        }
        .post-card .meta .tag.emerald { background: rgba(6,182,212,0.12); color: var(--clr-emerald); }
        .post-card .meta .tag.purple { background: rgba(139,92,246,0.12); color: #8b5cf6; }
        .post-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
        .post-card h3 a { color: var(--clr-text); transition: color var(--transition); }
        .post-card h3 a:hover { color: var(--clr-accent); }
        .post-card .excerpt { font-size: 0.9rem; color: var(--clr-text-secondary); line-height: 1.7; }
        .post-card .read-more { display: inline-flex; align-items: center; gap: 4px; font-size: 0.85rem; font-weight: 600; color: var(--clr-accent); margin-top: 12px; transition: gap var(--transition); }
        .post-card .read-more:hover { gap: 8px; }
        .empty-state { grid-column: 1 / -1; text-align: center; padding: 48px 20px; color: var(--clr-text-light); }
        .empty-state i { font-size: 2.4rem; margin-bottom: 16px; display: block; color: var(--clr-border); }
        .empty-state p { font-size: 1rem; }

        /* ===== 特色区块 ===== */
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .feature-item {
            padding: 28px;
            border-radius: var(--radius-md);
            background: var(--clr-card);
            border: 1px solid var(--clr-border);
            transition: all var(--transition);
        }
        .feature-item:hover { box-shadow: var(--shadow-md); border-color: var(--clr-accent); }
        .feature-item .icon { font-size: 2rem; margin-bottom: 16px; display: block; }
        .feature-item h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
        .feature-item p { font-size: 0.9rem; color: var(--clr-text-secondary); }

        /* ===== 数据统计 ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
        .stat-item { text-align: center; padding: 32px 16px; }
        .stat-item .num { font-size: 2.6rem; font-weight: 800; color: var(--clr-accent); letter-spacing: -0.02em; line-height: 1.2; }
        .stat-item .num .suffix { font-size: 1.2rem; color: var(--clr-text-light); font-weight: 600; }
        .stat-item .label { font-size: 0.9rem; color: var(--clr-text-secondary); margin-top: 4px; font-weight: 500; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            border-bottom: 1px solid var(--clr-border);
            padding: 20px 0;
        }
        .faq-item:first-child { padding-top: 0; }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            width: 100%;
            text-align: left;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--clr-text);
            padding: 4px 0;
            transition: color var(--transition);
            background: none;
            border: none;
            cursor: pointer;
        }
        .faq-question:hover { color: var(--clr-accent); }
        .faq-question i { transition: transform var(--transition); color: var(--clr-text-light); font-size: 0.9rem; }
        .faq-question[aria-expanded="true"] i { transform: rotate(180deg); color: var(--clr-accent); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0;
        }
        .faq-answer.active {
            max-height: 300px;
            padding-top: 12px;
        }
        .faq-answer p { font-size: 0.95rem; color: var(--clr-text-secondary); line-height: 1.8; margin-bottom: 0; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--clr-primary) 0%, #162a4a 60%, #1a3a5c 100%);
            padding: 80px 0;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 { color: #fff; font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.7); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
        .cta-section .btn i { font-size: 0.9rem; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--clr-primary);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
        .footer-brand .logo { color: #fff; font-size: 1.2rem; font-weight: 800; display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
        .footer-brand .logo i { color: var(--clr-emerald); }
        .footer-brand .logo span { background: linear-gradient(135deg, #fff 60%, var(--clr-emerald)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .footer-brand p { font-size: 0.85rem; color: rgba(255,255,255,0.5); max-width: 280px; line-height: 1.7; }
        .footer-col h4 { color: #fff; font-size: 0.9rem; font-weight: 700; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.04em; }
        .footer-col a { display: block; font-size: 0.85rem; color: rgba(255,255,255,0.55); padding: 4px 0; transition: color var(--transition); }
        .footer-col a:hover { color: #fff; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            margin-top: 40px;
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.45); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
        }

        @media (max-width: 768px) {
            .sidebar { transform: translateX(-100%); }
            .sidebar.open { transform: translateX(0); }
            .mobile-header { display: flex; }
            .main-content { margin-left: 0; }
            .sidebar-overlay { display: block; }
            .app-layout { flex-direction: column; }
            .section { padding: 56px 0; }
            .hero { padding: 60px 0 56px; }
            .hero h1 { font-size: clamp(1.8rem, 7vw, 2.6rem); }
            .hero-metrics { gap: 24px; }
            .hero-metric .num { font-size: 1.6rem; }
            .category-grid { grid-template-columns: 1fr; gap: 20px; }
            .post-list { grid-template-columns: 1fr; gap: 20px; }
            .features-grid { grid-template-columns: 1fr; gap: 16px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
            .stat-item .num { font-size: 2rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section { padding: 56px 0; }
            .section-header { margin-bottom: 32px; }
            .section-subtitle { margin-bottom: 32px; }
            .container { padding: 0 20px; }
        }

        @media (max-width: 520px) {
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .hero-metrics { flex-direction: column; gap: 16px; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
            .stat-item { padding: 20px 12px; }
            .stat-item .num { font-size: 1.6rem; }
            .card-body { padding: 20px; }
            .category-card { padding: 24px 20px; }
            .post-card { padding: 20px; }
            .feature-item { padding: 20px; }
            .section { padding: 40px 0; }
            .hero { padding: 40px 0 40px; }
            .container { padding: 0 16px; }
        }

        /* ===== Foundation 覆盖 ===== */
        .grid-container { max-width: 1200px; padding-left: 24px; padding-right: 24px; }
        @media (max-width: 768px) { .grid-container { padding-left: 20px; padding-right: 20px; } }
        @media (max-width: 520px) { .grid-container { padding-left: 16px; padding-right: 16px; } }
        .button { transition: all var(--transition); }
        .card { box-shadow: var(--shadow-sm); border-radius: var(--radius-md); border: 1px solid var(--clr-border); }
        .card-section { padding: 28px; }

        /* 标签样式 */
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--clr-accent-soft);
            color: var(--clr-accent);
            letter-spacing: 0.02em;
        }
        .tag.emerald { background: rgba(6,182,212,0.12); color: var(--clr-emerald); }
        .tag.purple { background: rgba(139,92,246,0.12); color: #8b5cf6; }
        .tag.amber { background: rgba(245,158,11,0.12); color: var(--clr-warning); }

        /* 徽章 */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 2px 10px;
            border-radius: 100px;
            font-size: 0.7rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }
        .badge-primary { background: var(--clr-accent); color: #fff; }
        .badge-emerald { background: var(--clr-emerald); color: #fff; }
        .badge-soft { background: var(--clr-accent-soft); color: var(--clr-accent); }

        /* 分隔线 */
        .divider { width: 60px; height: 4px; border-radius: 4px; background: linear-gradient(90deg, var(--clr-accent), var(--clr-emerald)); margin: 0 auto 24px; }
        .divider-left { margin: 0 0 24px; }

        /* 动画辅助 */
        .fade-up { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
        .fade-up.visible { opacity: 1; transform: translateY(0); }

        /* 滚动条美化 */
        .sidebar::-webkit-scrollbar { width: 4px; }
        .sidebar::-webkit-scrollbar-track { background: transparent; }
        .sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 4px; }
        .sidebar::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --secondary-light: #1e293b;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --success: #10b981;
            --info: #06b6d4;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-card: #1e293b;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #f1f5f9;
            --text-light: #cbd5e1;
            --border-color: #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, 0.12), 0 4px 16px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.15);
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --sidebar-width: 260px;
            --header-height: 0px;
            --spacing-section: 5rem;
            --spacing-block: 3rem;
        }

        /* ===== Reset & Base ===== */
        *,
        *::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);
            color: var(--text-primary);
            background: var(--bg-body);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            outline: 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: clamp(2.2rem, 5vw, 3.6rem);
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: clamp(1.2rem, 2.2vw, 1.6rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Layout: Sidebar + Content ===== */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            width: var(--sidebar-width);
            background: var(--bg-white);
            border-right: 1px solid var(--border-color);
            position: fixed;
            top: 0;
            left: 0;
            height: 100vh;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: 24px 0;
            transition: var(--transition);
            overflow-y: auto;
        }
        .sidebar .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 24px 28px 24px;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 20px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--secondary);
        }
        .sidebar .logo i {
            font-size: 1.8rem;
            color: var(--primary);
        }
        .sidebar .logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 0 16px;
            flex: 1;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--text-muted);
            padding: 8px 12px 6px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .sidebar-nav a:hover i {
            color: var(--primary);
        }
        .sidebar-nav a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        .sidebar-nav a.active i {
            color: #fff;
        }

        /* Main Content Area */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Page Header / Breadcrumb ===== */
        .page-header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .page-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .breadcrumb a {
            color: var(--text-secondary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text-muted);
        }
        .breadcrumb .sep {
            color: var(--border-color);
        }
        .page-header .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .page-header .header-actions .search-box {
            display: flex;
            align-items: center;
            background: var(--bg-body);
            border: 1px solid var(--border-color);
            border-radius: 50px;
            padding: 6px 16px 6px 18px;
            gap: 8px;
            transition: var(--transition);
        }
        .page-header .header-actions .search-box:focus-within {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        .page-header .header-actions .search-box input {
            border: none;
            background: transparent;
            padding: 6px 0;
            font-size: 0.9rem;
            color: var(--text-primary);
            width: 180px;
        }
        .page-header .header-actions .search-box input::placeholder {
            color: var(--text-muted);
        }
        .page-header .header-actions .search-box i {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            background: linear-gradient(135deg, var(--secondary) 0%, #1a2a4a 60%, #0f2640 100%);
            padding: 4rem 0 3.5rem;
            position: relative;
            overflow: hidden;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 80% 40%, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .category-hero .container {
            position: relative;
            z-index: 1;
        }
        .category-hero h1 {
            color: #fff;
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .category-hero h1 i {
            color: var(--accent);
            margin-right: 12px;
        }
        .category-hero p {
            color: var(--text-light);
            font-size: 1.1rem;
            max-width: 700px;
            margin-bottom: 0;
            opacity: 0.9;
        }
        .category-hero .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }
        .category-hero .hero-tags .tag {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #fff;
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
        }
        .category-hero .hero-tags .tag i {
            margin-right: 6px;
            color: var(--accent);
        }

        /* ===== Sections ===== */
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-alt {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark h4 {
            color: #fff;
        }
        .section-dark p {
            color: var(--text-light);
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-title h2 {
            margin-bottom: 12px;
        }
        .section-title p {
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
            color: var(--text-muted);
        }
        .section-title .badge {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.03em;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            padding: 28px 24px;
            transition: var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: transparent;
        }
        .card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 16px;
            color: #fff;
        }
        .card .card-icon.blue {
            background: linear-gradient(135deg, #2563eb, #1d4ed8);
        }
        .card .card-icon.green {
            background: linear-gradient(135deg, #10b981, #059669);
        }
        .card .card-icon.orange {
            background: linear-gradient(135deg, #f59e0b, #d97706);
        }
        .card .card-icon.purple {
            background: linear-gradient(135deg, #8b5cf6, #7c3aed);
        }
        .card .card-icon.cyan {
            background: linear-gradient(135deg, #06b6d4, #0891b2);
        }
        .card .card-icon.red {
            background: linear-gradient(135deg, #ef4444, #dc2626);
        }
        .card h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }
        .card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 14px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary);
        }
        .card .card-link i {
            font-size: 0.8rem;
            transition: var(--transition);
        }
        .card .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Grid / Layout Helpers ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        /* ===== Step / Timeline ===== */
        .step-list {
            display: flex;
            flex-direction: column;
            gap: 28px;
            max-width: 800px;
            margin: 0 auto;
        }
        .step-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }
        .step-item .step-num {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        .step-item .step-content h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .step-item .step-content p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-item .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            gap: 16px;
            user-select: none;
        }
        .faq-item .faq-question i {
            color: var(--primary);
            transition: var(--transition);
            font-size: 0.9rem;
        }
        .faq-item .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 4rem 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 30% 50%, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            color: #fff;
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .btn-primary {
            background: #fff;
            color: var(--primary) !important;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
        }
        .btn-primary:hover {
            background: var(--primary-bg);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.15);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff !important;
            border: 2px solid rgba(255, 255, 255, 0.4);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-2px);
        }
        .btn-secondary {
            background: var(--secondary);
            color: #fff !important;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
        }
        .btn-secondary:hover {
            background: var(--secondary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.15);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-light);
            padding: 3.5rem 0 2rem;
            margin-top: auto;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        .site-footer .footer-brand .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .site-footer .footer-brand .logo i {
            color: var(--primary-light);
            font-size: 1.5rem;
        }
        .site-footer .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            max-width: 320px;
        }
        .site-footer .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .site-footer .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: var(--transition);
            text-decoration: none;
        }
        .site-footer .footer-col a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .site-footer .footer-bottom a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .site-footer .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
                --spacing-section: 3rem;
            }
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: var(--shadow-xl);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }
            .page-header .container {
                flex-direction: column;
                align-items: flex-start;
            }
            .page-header .header-actions {
                width: 100%;
            }
            .page-header .header-actions .search-box {
                flex: 1;
            }
            .page-header .header-actions .search-box input {
                width: 100%;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .category-hero {
                padding: 2.5rem 0 2rem;
            }
            .section-title {
                margin-bottom: 2rem;
            }
            .card {
                padding: 20px 18px;
            }
            .step-item {
                flex-direction: column;
                gap: 8px;
            }
            .step-item .step-num {
                width: 36px;
                height: 36px;
                font-size: 0.95rem;
            }
            .faq-item .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-item .faq-answer {
                padding: 0 18px 14px;
            }
            .cta-section {
                padding: 2.5rem 0;
            }

            /* Mobile menu toggle */
            .mobile-toggle {
                display: flex !important;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-hero h1 {
                font-size: 1.5rem;
            }
            .category-hero p {
                font-size: 0.95rem;
            }
            .btn {
                padding: 10px 24px;
                font-size: 0.9rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .page-header .header-actions .search-box input {
                font-size: 0.85rem;
            }
        }

        /* Mobile toggle button */
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 4px;
            align-items: center;
            justify-content: center;
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            backdrop-filter: blur(2px);
        }
        .sidebar-overlay.active {
            display: block;
        }

        @media (min-width: 769px) {
            .sidebar-overlay {
                display: none !important;
            }
            .mobile-toggle {
                display: none !important;
            }
        }

        /* ===== Misc Utilities ===== */
        .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;
        }
        .gap-2 {
            gap: 2rem;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
        }
        .align-center {
            align-items: center;
        }
        .justify-center {
            justify-content: center;
        }
        .badge-sm {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .badge-sm.green {
            background: #ecfdf5;
            color: #059669;
        }
        .badge-sm.orange {
            background: #fffbeb;
            color: #d97706;
        }
        .badge-sm.purple {
            background: #f5f3ff;
            color: #7c3aed;
        }

        /* Tag list */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag-list .tag-item {
            background: var(--bg-body);
            border: 1px solid var(--border-color);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--text-secondary);
            transition: var(--transition);
            cursor: default;
        }
        .tag-list .tag-item:hover {
            border-color: var(--primary-light);
            background: var(--primary-bg);
            color: var(--primary);
        }

        /* Stats row */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
        }
        .stats-row .stat-item h3 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }
        .stats-row .stat-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        @media (max-width: 768px) {
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stats-row .stat-item h3 {
                font-size: 1.5rem;
            }
        }

        /* Alert / Note */
        .note-box {
            background: var(--primary-bg);
            border-left: 4px solid var(--primary);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        .note-box i {
            color: var(--primary);
            margin-right: 8px;
        }

        /* Foundation Overrides */
        .grid-container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }
        @media (max-width: 768px) {
            .grid-container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #0f2b4a;
            --color-primary-light: #1a4270;
            --color-primary-dark: #091e33;
            --color-accent: #2563eb;
            --color-accent-light: #3b82f6;
            --color-accent-dark: #1d4ed8;
            --color-gold: #f59e0b;
            --color-gold-light: #fbbf24;
            --color-bg: #f1f5f9;
            --color-bg-alt: #e9edf2;
            --color-card: #ffffff;
            --color-text: #0f172a;
            --color-text-secondary: #475569;
            --color-text-muted: #94a3b8;
            --color-border: #d1d9e6;
            --color-border-light: #e2e8f0;
            --color-success: #10b981;
            --color-error: #ef4444;
            --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --font-heading: var(--font-body);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-glow: 0 0 20px rgba(37,99,235,0.15);
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 260px;
            --sidebar-collapsed: 72px;
            --header-height: 64px;
        }

        /* ===== 基础 Reset ===== */
        *,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
        html{scroll-behavior:smooth;font-size:16px;}
        body{font-family:var(--font-body);background:var(--color-bg);color:var(--color-text);line-height:1.7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;}
        a{color:var(--color-accent);text-decoration:none;transition:var(--transition);}
        a:hover{color:var(--color-accent-dark);}
        a:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px;border-radius:var(--radius-sm);}
        img{max-width:100%;height:auto;display:block;border-radius:var(--radius-md);}
        ul,ol{list-style:none;padding:0;margin:0;}
        h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:600;line-height:1.3;color:var(--color-text);}
        h1{font-size:2.25rem;letter-spacing:-0.02em;}
        h2{font-size:1.75rem;letter-spacing:-0.01em;}
        h3{font-size:1.35rem;}
        h4{font-size:1.1rem;}
        p{margin:0 0 1rem 0;color:var(--color-text-secondary);}
        button,input,textarea,select{font-family:inherit;font-size:inherit;transition:var(--transition);}
        button{cursor:pointer;border:none;background:none;}
        .container{max-width:1280px;margin:0 auto;padding:0 24px;}
        .section{padding:60px 0;}
        .section-alt{background:var(--color-bg-alt);}

        /* ===== 左侧导航 ===== */
        .site-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--color-primary);
            color: #fff;
            display: flex;
            flex-direction: column;
            z-index: 1000;
            box-shadow: 2px 0 20px rgba(0,0,0,0.15);
            transition: var(--transition);
            overflow-y: auto;
        }
        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 24px 20px 16px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .sidebar-brand .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
        }
        .sidebar-brand .logo i {
            font-size: 1.6rem;
            color: var(--color-gold-light);
        }
        .sidebar-brand .logo span {
            background: linear-gradient(135deg, #fff 60%, var(--color-gold-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .sidebar-nav {
            flex: 1;
            display: flex;
            flex-direction: column;
            padding: 16px 12px;
            gap: 4px;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: rgba(255,255,255,0.35);
            padding: 12px 12px 6px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
            color: rgba(255,255,255,0.5);
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255,255,255,0.08);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--color-gold-light);
        }
        .sidebar-nav a.active {
            background: rgba(37,99,235,0.25);
            color: #fff;
            box-shadow: inset 3px 0 0 var(--color-accent);
        }
        .sidebar-nav a.active i {
            color: var(--color-accent-light);
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.75rem;
            color: rgba(255,255,255,0.3);
            text-align: center;
        }

        /* ===== 右侧主内容 ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .main-content {
            flex: 1;
            padding: 0 0 40px;
        }

        /* ===== 移动端顶部导航 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: var(--color-primary);
            z-index: 1100;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0,0,0,0.15);
        }
        .mobile-header .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-weight: 700;
            font-size: 1.15rem;
        }
        .mobile-header .logo i {
            font-size: 1.4rem;
            color: var(--color-gold-light);
        }
        .mobile-header .logo span {
            background: linear-gradient(135deg, #fff 60%, var(--color-gold-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .mobile-toggle {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.5rem;
            border-radius: var(--radius-sm);
            background: rgba(255,255,255,0.08);
            cursor: pointer;
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            background: rgba(255,255,255,0.15);
        }
        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1050;
            backdrop-filter: blur(4px);
        }
        .mobile-overlay.open {
            display: block;
        }

        /* ===== 文章头部 ===== */
        .article-header {
            padding: 40px 0 20px;
            background: var(--color-card);
            border-bottom: 1px solid var(--color-border-light);
        }
        .article-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--color-text-muted);
            margin-bottom: 20px;
        }
        .article-breadcrumb a {
            color: var(--color-text-muted);
            text-decoration: none;
        }
        .article-breadcrumb a:hover {
            color: var(--color-accent);
        }
        .article-breadcrumb span {
            color: var(--color-text-secondary);
        }
        .article-title {
            font-size: 2.2rem;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--color-text);
            letter-spacing: -0.01em;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px 24px;
            font-size: 0.9rem;
            color: var(--color-text-secondary);
        }
        .article-meta .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-accent);
            color: #fff;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }
        .article-meta .badge i {
            font-size: 0.7rem;
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-item i {
            color: var(--color-text-muted);
            font-size: 0.85rem;
        }

        /* ===== 文章正文 ===== */
        .article-body-wrap {
            padding: 40px 0 32px;
            background: var(--color-card);
        }
        .article-body {
            max-width: 800px;
            margin: 0 auto;
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--color-text-secondary);
        }
        .article-body h2,
        .article-body h3,
        .article-body h4 {
            margin-top: 2rem;
            margin-bottom: 0.75rem;
            color: var(--color-text);
        }
        .article-body p {
            margin-bottom: 1.2rem;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 1.2rem;
            padding-left: 1.5rem;
            list-style: disc;
        }
        .article-body ol {
            list-style: decimal;
        }
        .article-body li {
            margin-bottom: 0.4rem;
            color: var(--color-text-secondary);
        }
        .article-body a {
            color: var(--color-accent);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body a:hover {
            color: var(--color-accent-dark);
        }
        .article-body blockquote {
            border-left: 4px solid var(--color-accent);
            padding: 12px 20px;
            margin: 1.5rem 0;
            background: var(--color-bg);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--color-text-secondary);
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.5rem 0;
            box-shadow: var(--shadow-md);
        }
        .article-body pre {
            background: var(--color-primary);
            color: #e2e8f0;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            font-size: 0.9rem;
            line-height: 1.6;
            margin: 1.5rem 0;
        }
        .article-body code {
            font-family: 'Fira Code', 'JetBrains Mono', monospace;
            background: var(--color-bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--color-primary);
        }
        .article-body pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        /* ===== 标签分享 ===== */
        .article-tags-share {
            padding: 24px 0 16px;
            background: var(--color-card);
            border-top: 1px solid var(--color-border-light);
        }
        .tags-share-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag-list .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--color-bg);
            color: var(--color-text-secondary);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
            text-decoration: none;
        }
        .tag-list .tag:hover {
            background: var(--color-accent);
            color: #fff;
            border-color: var(--color-accent);
            transform: translateY(-1px);
        }
        .share-buttons {
            display: flex;
            gap: 10px;
        }
        .share-buttons a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--color-bg);
            color: var(--color-text-secondary);
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
            font-size: 1rem;
            text-decoration: none;
        }
        .share-buttons a:hover {
            background: var(--color-accent);
            color: #fff;
            border-color: var(--color-accent);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* ===== 上下篇导航 ===== */
        .article-prev-next {
            padding: 24px 0;
            background: var(--color-card);
            border-top: 1px solid var(--color-border-light);
        }
        .prev-next-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .prev-next-item {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 16px 20px;
            border-radius: var(--radius-md);
            background: var(--color-bg);
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
            text-decoration: none;
        }
        .prev-next-item:hover {
            background: var(--color-card);
            border-color: var(--color-accent);
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }
        .prev-next-item .label {
            font-size: 0.75rem;
            color: var(--color-text-muted);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-weight: 600;
        }
        .prev-next-item .title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.4;
        }
        .prev-next-item:hover .title {
            color: var(--color-accent);
        }
        .prev-next-item.next {
            text-align: right;
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 50px 0;
            background: var(--color-bg);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 28px;
        }
        .related-card {
            background: var(--color-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-accent);
        }
        .related-card .card-img {
            height: 180px;
            background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.2);
            font-size: 2.5rem;
            position: relative;
            overflow: hidden;
        }
        .related-card .card-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.3));
        }
        .related-card .card-img i {
            position: relative;
            z-index: 1;
            opacity: 0.6;
        }
        .related-card .card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-body .cat {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--color-accent);
            font-weight: 600;
            margin-bottom: 6px;
        }
        .related-card .card-body h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card .card-body h4 a {
            color: var(--color-text);
            text-decoration: none;
        }
        .related-card .card-body h4 a:hover {
            color: var(--color-accent);
        }
        .related-card .card-body p {
            font-size: 0.88rem;
            color: var(--color-text-secondary);
            margin-bottom: 12px;
            flex: 1;
        }
        .related-card .card-body .meta {
            font-size: 0.78rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* ===== CTA 区 ===== */
        .cta-section {
            padding: 60px 0;
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
            color: #fff;
            text-align: center;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.75);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--color-accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(37,99,235,0.35);
        }
        .btn-primary:hover {
            background: var(--color-accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37,99,235,0.45);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.3);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.1);
            color: #fff;
            border-color: rgba(255,255,255,0.6);
            transform: translateY(-2px);
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.05rem;
        }

        /* ===== FAQ 区 ===== */
        .faq-section {
            padding: 50px 0;
            background: var(--color-card);
        }
        .faq-list {
            max-width: 800px;
            margin: 28px auto 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--color-border);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 24px;
            background: var(--color-bg);
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--color-text);
            transition: var(--transition);
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question:hover {
            background: var(--color-bg-alt);
        }
        .faq-question i {
            transition: var(--transition);
            color: var(--color-text-muted);
            font-size: 0.85rem;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-accent);
        }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.25s ease;
        }
        .faq-item.open .faq-answer {
            padding: 12px 24px 20px;
            max-height: 300px;
        }
        .faq-answer p {
            margin: 0;
            color: var(--color-text-secondary);
            font-size: 0.95rem;
        }

        /* ===== 错误状态 ===== */
        .error-state {
            text-align: center;
            padding: 60px 20px;
        }
        .error-state i {
            font-size: 3.5rem;
            color: var(--color-text-muted);
            margin-bottom: 20px;
        }
        .error-state h2 {
            font-size: 1.6rem;
            margin-bottom: 12px;
        }
        .error-state p {
            color: var(--color-text-secondary);
            margin-bottom: 24px;
        }
        .error-state .btn {
            display: inline-flex;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--color-primary-dark);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand .logo i {
            color: var(--color-gold-light);
            font-size: 1.4rem;
        }
        .footer-brand .logo span {
            background: linear-gradient(135deg, #fff 60%, var(--color-gold-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .footer-brand p {
            color: rgba(255,255,255,0.5);
            font-size: 0.88rem;
            line-height: 1.6;
            margin: 0;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.5);
            font-size: 0.88rem;
            padding: 4px 0;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-col a:hover {
            color: var(--color-gold-light);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom a {
            color: rgba(255,255,255,0.4);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: var(--color-gold-light);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-title {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 768px) {
            .site-sidebar {
                transform: translateX(-100%);
                width: 280px;
            }
            .site-sidebar.open {
                transform: translateX(0);
            }
            .main-wrapper {
                margin-left: 0;
                padding-top: var(--header-height);
            }
            .mobile-header {
                display: flex;
            }
            .article-title {
                font-size: 1.5rem;
            }
            .article-meta {
                gap: 12px 16px;
                font-size: 0.82rem;
            }
            .prev-next-grid {
                grid-template-columns: 1fr;
            }
            .prev-next-item.next {
                text-align: left;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .tags-share-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .section {
                padding: 36px 0;
            }
            .article-header {
                padding: 24px 0 16px;
            }
            .article-body-wrap {
                padding: 24px 0;
            }
            .article-body {
                font-size: 0.98rem;
            }
        }

        @media (max-width: 520px) {
            .article-title {
                font-size: 1.25rem;
            }
            .article-meta .meta-item {
                font-size: 0.75rem;
            }
            .btn-lg {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
            .container {
                padding: 0 16px;
            }
            .faq-question {
                font-size: 0.92rem;
                padding: 14px 16px;
            }
            .faq-answer {
                padding: 0 16px;
            }
            .faq-item.open .faq-answer {
                padding: 10px 16px 16px;
            }
            .related-card .card-img {
                height: 140px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== 小工具 ===== */
        .text-center { text-align: center; }
        .mb-0 { margin-bottom: 0; }
        .mt-2 { margin-top: 8px; }
        .gap-4 { gap: 16px; }
        .flex-wrap { display: flex; flex-wrap: wrap; align-items: center; }
        .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 8px;
            color: var(--color-text);
        }
        .section-subtitle {
            text-align: center;
            color: var(--color-text-secondary);
            font-size: 0.95rem;
            max-width: 580px;
            margin: 0 auto 8px;
        }

/* roulang page: category2 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a5c9e;
            --primary-light: #2a7bcf;
            --primary-dark: #0f3f6e;
            --secondary: #f48c1e;
            --secondary-light: #f7a84a;
            --accent-teal: #0ea5a0;
            --bg-light: #f5f8fc;
            --bg-white: #ffffff;
            --bg-dark: #0b1a2e;
            --bg-card: #ffffff;
            --text-primary: #1a2332;
            --text-secondary: #4a5670;
            --text-muted: #8896ae;
            --text-inverse: #f0f4fa;
            --border-light: #e2e8f0;
            --border-medium: #c8d2e0;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.07);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.10);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --transition: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --sidebar-width: 240px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::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-light);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            display: flex;
            min-height: 100vh;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus {
            color: var(--primary-light);
        }
        a:focus-visible {
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        ul,
        ol {
            list-style: none;
        }

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

        /* ===== Sidebar Navigation (Desktop) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-width);
            background: var(--bg-dark);
            color: var(--text-inverse);
            display: flex;
            flex-direction: column;
            padding: 28px 0 20px;
            z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
        }

        .sidebar .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: #fff;
            padding: 0 24px 28px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .sidebar .logo i {
            color: var(--secondary);
            font-size: 1.6rem;
        }

        .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--text-muted);
            padding: 20px 24px 6px;
            opacity: 0.6;
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 2px;
            padding: 8px 12px 0;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-md);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.92rem;
            font-weight: 450;
            transition: background var(--transition), color var(--transition);
        }
        .sidebar-nav a i {
            width: 18px;
            text-align: center;
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.4);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover,
        .sidebar-nav a:focus {
            background: rgba(255, 255, 255, 0.07);
            color: #fff;
        }
        .sidebar-nav a:hover i,
        .sidebar-nav a:focus i {
            color: var(--secondary);
        }
        .sidebar-nav a.active {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            font-weight: 600;
        }
        .sidebar-nav a.active i {
            color: var(--secondary);
        }

        /* ===== Main Content Area ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .page-content {
            flex: 1;
        }

        /* ===== Top Bar (Mobile) ===== */
        .top-bar-mobile {
            display: none;
            background: var(--bg-dark);
            color: #fff;
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .top-bar-mobile .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
        }
        .top-bar-mobile .logo i {
            color: var(--secondary);
        }
        .menu-toggle {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            padding: 4px 8px;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .menu-toggle:hover,
        .menu-toggle:focus {
            background: rgba(255, 255, 255, 0.1);
        }

        /* Mobile overlay */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
        }
        .sidebar-overlay.open {
            display: block;
        }

        /* ===== Hero / Page Header ===== */
        .page-hero {
            background: linear-gradient(135deg, var(--bg-dark) 0%, #0f2a44 100%);
            padding: 60px 24px 48px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            right: -10%;
            top: -20%;
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(244, 140, 30, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
        }
        .page-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .page-hero h1 i {
            color: var(--secondary);
            margin-right: 10px;
        }
        .page-hero p {
            font-size: 1.1rem;
            max-width: 640px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.8;
            margin-bottom: 0;
        }
        .page-hero .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 20px;
        }
        .page-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.65);
        }
        .page-hero .breadcrumb a:hover {
            color: #fff;
        }
        .page-hero .breadcrumb span {
            color: var(--secondary);
        }

        /* ===== Section Shared ===== */
        .section {
            padding: 64px 0;
        }
        .section-alt {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-inverse);
        }
        .section-sm {
            padding: 40px 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 32px;
        }
        .section-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }

        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 28px 24px;
            transition: box-shadow var(--transition), transform var(--transition);
            border: 1px solid var(--border-light);
            height: 100%;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .card .card-icon {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }
        .card .badge {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            font-size: 0.7rem;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: 20px;
            margin-bottom: 10px;
            letter-spacing: 0.02em;
        }
        .card .badge.orange {
            background: var(--secondary);
        }
        .card .badge.teal {
            background: var(--accent-teal);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.92rem;
            transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
            border: none;
            cursor: pointer;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--primary-light);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26, 92, 158, 0.3);
            transform: translateY(-1px);
        }
        .btn-secondary {
            background: var(--secondary);
            color: #fff;
        }
        .btn-secondary:hover,
        .btn-secondary:focus {
            background: var(--secondary-light);
            color: #fff;
            box-shadow: 0 4px 16px rgba(244, 140, 30, 0.3);
            transform: translateY(-1px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
        }
        .btn-outline:hover,
        .btn-outline:focus {
            background: var(--primary);
            color: #fff;
        }
        .btn-lg {
            padding: 14px 32px;
            font-size: 1rem;
        }
        .btn-sm {
            padding: 6px 16px;
            font-size: 0.82rem;
        }

        /* ===== Badge / Tag ===== */
        .tag {
            display: inline-block;
            background: var(--bg-light);
            color: var(--text-secondary);
            font-size: 0.78rem;
            padding: 4px 12px;
            border-radius: 20px;
            border: 1px solid var(--border-light);
            transition: background var(--transition), color var(--transition);
        }
        .tag:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .tag.primary {
            background: rgba(26, 92, 158, 0.08);
            color: var(--primary);
            border-color: transparent;
        }

        /* ===== Stats ===== */
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.1;
            color: var(--primary);
            letter-spacing: -0.02em;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        /* ===== Features / Icon Grid ===== */
        .feature-item {
            display: flex;
            gap: 16px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .feature-item:last-child {
            border-bottom: none;
        }
        .feature-item .fi-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            background: rgba(26, 92, 158, 0.08);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--primary);
        }
        .feature-item h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .feature-item p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 18px 0;
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            gap: 12px;
            user-select: none;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            transition: transform var(--transition);
            color: var(--text-muted);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 12px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: #fff;
            text-align: center;
            padding: 56px 24px;
            border-radius: var(--radius-lg);
            margin: 32px 0;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.05rem;
            opacity: 0.85;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn {
            margin: 4px 8px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 40px 0 20px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        .footer-brand .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-brand .logo i {
            color: var(--secondary);
        }
        .footer-brand p {
            font-size: 0.88rem;
            line-height: 1.7;
            opacity: 0.7;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.85rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 18px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.8rem;
            opacity: 0.6;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }

        /* ===== Grid / Foundation Overrides ===== */
        .grid-x,
        .grid-y {
            margin: 0;
        }
        .cell {
            padding: 0;
        }
        .grid-padding-x .cell {
            padding-left: 12px;
            padding-right: 12px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-wrapper {
                margin-left: 0;
            }
            .top-bar-mobile {
                display: flex;
            }

            .page-hero h1 {
                font-size: 1.8rem;
            }
            .page-hero p {
                font-size: 0.95rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .section {
                padding: 40px 0;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section {
                padding: 36px 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

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

            .feature-item {
                flex-direction: column;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 1.4rem;
            }
            .page-hero {
                padding: 36px 16px 32px;
            }
            .container {
                padding: 0 16px;
            }
            .card {
                padding: 20px 16px;
            }
            .btn-lg {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
        }

        /* ===== Utility ===== */
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }
        .mb-4 { margin-bottom: 32px; }
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mt-4 { margin-top: 32px; }
        .text-center { text-align: center; }
        .text-muted { color: var(--text-muted); }
        .flex-center { display: flex; align-items: center; justify-content: center; gap: 8px; }
        .gap-1 { gap: 8px; }
        .gap-2 { gap: 16px; }
        .gap-3 { gap: 24px; }

        /* Timeline (simple) */
        .timeline {
            position: relative;
            padding-left: 28px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 4px;
            bottom: 4px;
            width: 2px;
            background: var(--border-medium);
        }
        .timeline-item {
            position: relative;
            padding-bottom: 28px;
        }
        .timeline-item:last-child {
            padding-bottom: 0;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -24px;
            top: 6px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
            border: 2px solid var(--bg-light);
        }
        .timeline-item h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .timeline-item p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

/* roulang page: category3 */
:root {
            --primary: #0d6efd;
            --primary-dark: #0a58ca;
            --primary-light: #e8f0fe;
            --secondary: #6f42c1;
            --accent: #00b4d8;
            --success: #2ecc71;
            --warning: #f39c12;
            --dark: #1a1a2e;
            --darker: #0f0f1a;
            --gray-900: #212529;
            --gray-700: #495057;
            --gray-600: #6c757d;
            --gray-500: #adb5bd;
            --gray-300: #dee2e6;
            --gray-200: #e9ecef;
            --gray-100: #f8f9fa;
            --white: #ffffff;
            --body-bg: #f5f7fb;
            --card-bg: #ffffff;
            --border-radius: 12px;
            --border-radius-sm: 8px;
            --border-radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --sidebar-width: 240px;
            --header-height: 0px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background: var(--body-bg);
            color: var(--gray-900);
            line-height: 1.7;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

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

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

        button,
        .button {
            transition: var(--transition);
        }

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

        /* ===== 左侧竖向导航 ===== */
        .app-layout {
            display: flex;
            min-height: 100vh;
        }

        .sidebar {
            width: var(--sidebar-width);
            background: var(--darker);
            color: var(--white);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: 32px 20px 24px;
            overflow-y: auto;
            transition: var(--transition);
            border-right: 1px solid rgba(255, 255, 255, 0.04);
        }

        .sidebar .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 36px;
            padding-bottom: 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .sidebar .logo i {
            font-size: 1.6rem;
            color: var(--accent);
        }

        .sidebar .logo span {
            background: linear-gradient(135deg, #fff 60%, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: rgba(255, 255, 255, 0.3);
            margin-bottom: 16px;
            font-weight: 600;
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            flex: 1;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--border-radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.92rem;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.4);
            transition: var(--transition);
        }

        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--white);
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }

        .sidebar-nav a.active {
            background: rgba(13, 110, 253, 0.2);
            color: var(--white);
            font-weight: 600;
            box-shadow: inset 3px 0 0 var(--primary);
        }
        .sidebar-nav a.active i {
            color: var(--primary);
        }

        .sidebar-footer {
            margin-top: auto;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.3);
            text-align: center;
        }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .page-header {
            background: var(--darker);
            color: var(--white);
            padding: 60px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .page-header::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(13, 110, 253, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }

        .page-header .container {
            position: relative;
            z-index: 1;
        }

        .page-header h1 {
            font-size: 2.6rem;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #fff 60%, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .page-header .breadcrumb {
            display: flex;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 16px;
        }
        .page-header .breadcrumb a {
            color: rgba(255, 255, 255, 0.6);
        }
        .page-header .breadcrumb a:hover {
            color: var(--white);
        }
        .page-header .breadcrumb span {
            color: rgba(255, 255, 255, 0.85);
        }

        .page-header p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 620px;
            line-height: 1.8;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 72px 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--gray-900);
            letter-spacing: -0.3px;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--gray-600);
            max-width: 640px;
            margin-bottom: 40px;
            line-height: 1.7;
        }

        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        .bg-white {
            background: var(--white);
        }

        .bg-light {
            background: var(--gray-100);
        }

        .bg-dark {
            background: var(--darker);
            color: var(--white);
        }
        .bg-dark .section-title {
            color: var(--white);
        }
        .bg-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            padding: 28px 24px;
            transition: var(--transition);
            border: 1px solid var(--gray-200);
            height: 100%;
        }

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

        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            background: var(--primary-light);
            color: var(--primary);
            margin-bottom: 16px;
        }

        .card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--gray-900);
        }

        .card p {
            font-size: 0.92rem;
            color: var(--gray-600);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .card .meta {
            font-size: 0.8rem;
            color: var(--gray-500);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .card .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.72rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
        }

        .card .tag.green {
            background: #e8f5e9;
            color: #2e7d32;
        }
        .card .tag.orange {
            background: #fff3e0;
            color: #e65100;
        }
        .card .tag.purple {
            background: #f3e5f5;
            color: #7b1fa2;
        }

        .card .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            background: var(--primary);
            color: var(--white);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
        }
        .card .download-btn:hover {
            background: var(--primary-dark);
            color: var(--white);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
        }

        /* ===== 资源分类筛选 ===== */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 36px;
        }

        .filter-bar .filter-btn {
            padding: 8px 22px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid var(--gray-300);
            background: var(--white);
            color: var(--gray-700);
            cursor: pointer;
            transition: var(--transition);
        }

        .filter-bar .filter-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }

        .filter-bar .filter-btn.active {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }

        /* ===== 统计数字 ===== */
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .stat-item {
            text-align: center;
            padding: 24px 16px;
        }

        .stat-item .number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }

        .stat-item .label {
            font-size: 0.9rem;
            color: var(--gray-600);
            font-weight: 500;
        }

        .bg-dark .stat-item .number {
            color: var(--accent);
        }
        .bg-dark .stat-item .label {
            color: rgba(255, 255, 255, 0.6);
        }

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

        .faq-item {
            border-bottom: 1px solid var(--gray-200);
            padding: 20px 0;
        }

        .faq-item:first-child {
            padding-top: 0;
        }

        .faq-question {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--gray-900);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            gap: 16px;
            user-select: none;
        }

        .faq-question i {
            color: var(--primary);
            font-size: 0.9rem;
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-question.open i {
            transform: rotate(180deg);
        }

        .faq-answer {
            font-size: 0.95rem;
            color: var(--gray-600);
            line-height: 1.8;
            margin-top: 12px;
            display: none;
            padding-right: 32px;
        }
        .faq-answer.show {
            display: block;
        }

        .bg-dark .faq-item {
            border-bottom-color: rgba(255, 255, 255, 0.08);
        }
        .bg-dark .faq-question {
            color: var(--white);
        }
        .bg-dark .faq-answer {
            color: rgba(255, 255, 255, 0.65);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            text-align: center;
            padding: 64px 24px;
            border-radius: var(--border-radius-lg);
        }

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 1.05rem;
            opacity: 0.9;
            max-width: 560px;
            margin: 0 auto 28px;
        }

        .cta-section .button {
            background: var(--white);
            color: var(--primary);
            padding: 14px 40px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 700;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            display: inline-block;
        }

        .cta-section .button:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
            background: var(--gray-100);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--darker);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 32px;
            margin-top: auto;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .site-footer .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 12px;
        }

        .site-footer .logo i {
            color: var(--accent);
        }

        .site-footer .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.7;
            max-width: 280px;
        }

        .site-footer .footer-col h4 {
            color: var(--white);
            font-size: 0.9rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        .site-footer .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.85rem;
            padding: 4px 0;
            transition: var(--transition);
        }
        .site-footer .footer-col a:hover {
            color: var(--white);
            padding-left: 4px;
        }

        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.35);
            flex-wrap: wrap;
            gap: 12px;
        }

        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
        }
        .site-footer .footer-bottom a:hover {
            color: var(--white);
        }

        /* ===== 响应式 ===== */
        @media screen and (max-width: 1024px) {
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media screen and (max-width: 768px) {
            .app-layout {
                flex-direction: column;
            }

            .sidebar {
                width: 100%;
                position: relative;
                padding: 16px 20px 12px;
                flex-direction: row;
                flex-wrap: wrap;
                align-items: center;
                border-right: none;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            }

            .sidebar .logo {
                margin-bottom: 0;
                padding-bottom: 0;
                border-bottom: none;
                font-size: 1.1rem;
                flex-shrink: 0;
            }

            .nav-label {
                display: none;
            }

            .sidebar-nav {
                flex-direction: row;
                flex-wrap: wrap;
                gap: 2px;
                flex: 1;
                justify-content: flex-end;
            }

            .sidebar-nav a {
                padding: 8px 12px;
                font-size: 0.8rem;
                gap: 6px;
                border-radius: 6px;
            }
            .sidebar-nav a i {
                font-size: 0.85rem;
                width: 16px;
            }
            .sidebar-nav a.active {
                box-shadow: none;
                background: rgba(13, 110, 253, 0.25);
            }

            .sidebar-footer {
                display: none;
            }

            .main-content {
                margin-left: 0;
            }

            .page-header {
                padding: 40px 0 32px;
            }
            .page-header h1 {
                font-size: 1.8rem;
            }
            .page-header p {
                font-size: 0.95rem;
            }

            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }

            .filter-bar {
                gap: 8px;
            }
            .filter-bar .filter-btn {
                padding: 6px 16px;
                font-size: 0.78rem;
            }

            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item .number {
                font-size: 1.8rem;
            }

            .cta-section {
                padding: 40px 20px;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media screen and (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .sidebar {
                padding: 12px 12px 10px;
            }
            .sidebar .logo {
                font-size: 0.95rem;
                gap: 6px;
            }
            .sidebar .logo i {
                font-size: 1.1rem;
            }
            .sidebar-nav a {
                padding: 6px 10px;
                font-size: 0.72rem;
                gap: 4px;
            }
            .sidebar-nav a i {
                font-size: 0.75rem;
                width: 14px;
            }

            .page-header h1 {
                font-size: 1.4rem;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .stat-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 16px 8px;
            }
            .stat-item .number {
                font-size: 1.5rem;
            }
            .card {
                padding: 20px 16px;
            }
            .faq-question {
                font-size: 0.95rem;
            }
        }

        /* ===== 移动端菜单切换辅助 ===== */
        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--white);
            font-size: 1.3rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }

        @media screen and (max-width: 768px) {
            .mobile-menu-toggle {
                display: block;
                margin-left: auto;
            }
            .sidebar-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                margin-top: 12px;
                border-top: 1px solid rgba(255, 255, 255, 0.06);
                padding-top: 12px;
            }
            .sidebar-nav.open {
                display: flex;
            }
        }

        @media screen and (max-width: 520px) {
            .mobile-menu-toggle {
                font-size: 1.1rem;
            }
        }