/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1b2d;
            --primary-light: #1a2d46;
            --primary-mid: #243b5a;
            --accent: #3b82f6;
            --accent-hover: #2563eb;
            --accent-glow: rgba(59, 130, 246, 0.25);
            --accent-soft: #dbeafe;
            --bg-body: #f0f4f9;
            --bg-card: #ffffff;
            --bg-sidebar: #0a1421;
            --bg-sidebar-hover: #162033;
            --bg-dark: #0a1421;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-inverse: #f1f5f9;
            --text-sidebar: #cbd5e1;
            --text-sidebar-active: #ffffff;
            --border-light: #e2e8f0;
            --border-card: #eef2f6;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 18px;
            --radius-xl: 24px;
            --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-card: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-sidebar: 2px 0 20px rgba(0,0,0,0.3);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --sidebar-width: 240px;
            --header-height: 64px;
            --max-width: 1240px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }
        a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent-hover); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { 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(--text-primary); }
        h1 { font-size: 2.6rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: 28px;
            padding-right: 28px;
        }
        .container-narrow { max-width: 860px; }

        /* ===== 侧边栏导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-sidebar);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-sidebar);
            transition: transform var(--transition);
        }
        .sidebar-brand {
            display: flex;
            align-items: center;
            padding: 20px 22px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            min-height: var(--header-height);
        }
        .sidebar-brand .logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.3px;
            line-height: 1.2;
        }
        .sidebar-brand .logo span { color: var(--accent); }
        .sidebar-brand .logo-sub {
            font-size: 0.7rem;
            color: var(--text-muted);
            font-weight: 400;
            letter-spacing: 0.5px;
            margin-top: 1px;
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            overflow-y: auto;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-muted);
            padding: 16px 12px 6px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-sidebar);
            font-size: 0.95rem;
            font-weight: 500;
            transition: background var(--transition), color var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i { width: 20px; text-align: center; font-size: 1rem; color: var(--text-muted); transition: color var(--transition); }
        .sidebar-nav a:hover { background: var(--bg-sidebar-hover); color: #fff; }
        .sidebar-nav a:hover i { color: var(--accent); }
        .sidebar-nav a.active { background: rgba(59, 130, 246, 0.15); color: #fff; }
        .sidebar-nav a.active i { color: var(--accent); }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 0.75rem;
            color: var(--text-muted);
            text-align: center;
        }

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

        /* ===== 移动端顶部栏 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: var(--bg-sidebar);
            color: #fff;
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0,0,0,0.2);
        }
        .mobile-header .logo {
            font-size: 1.1rem;
            font-weight: 800;
            color: #fff;
        }
        .mobile-header .logo span { color: var(--accent); }
        .mobile-menu-btn {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            padding: 6px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .mobile-menu-btn:hover { background: rgba(255,255,255,0.08); }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }
        .sidebar-overlay.open { opacity: 1; pointer-events: auto; }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: 80px 0 90px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: #fff;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10,20,33,0.85) 0%, rgba(10,20,33,0.55) 70%, rgba(10,20,33,0.3) 100%);
            z-index: 1;
        }
        .hero .container { position: relative; z-index: 2; }
        .hero-badge {
            display: inline-block;
            background: var(--accent-glow);
            color: var(--accent);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 50px;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(59, 130, 246, 0.2);
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .hero h1 {
            font-size: 3rem;
            line-height: 1.2;
            color: #fff;
            max-width: 720px;
            margin-bottom: 16px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        .hero h1 span { color: var(--accent); }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.75);
            max-width: 580px;
            line-height: 1.8;
            margin-bottom: 32px;
        }
        .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
        .hero-actions .btn-primary {
            background: var(--accent);
            color: #fff;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 20px rgba(59,130,246,0.3);
        }
        .hero-actions .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(59,130,246,0.4);
        }
        .hero-actions .btn-outline {
            background: transparent;
            color: #fff;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            border: 2px solid rgba(255,255,255,0.25);
            transition: background var(--transition), border-color var(--transition);
        }
        .hero-actions .btn-outline:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.4); }

        /* ===== 板块通用 ===== */
        .section { padding: 72px 0; }
        .section-alt { background: #fff; }
        .section-dark { background: var(--bg-dark); color: var(--text-inverse); }
        .section-dark h2, .section-dark h3 { color: #fff; }
        .section-header { text-align: center; margin-bottom: 48px; }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }
        .section-dark .section-header p { color: rgba(255,255,255,0.6); }

        /* ===== 介绍板块 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-content h2 { margin-bottom: 16px; }
        .intro-content p { color: var(--text-secondary); margin-bottom: 16px; font-size: 1.02rem; }
        .intro-content .feature-list { margin-top: 20px; }
        .intro-content .feature-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 6px 0;
            color: var(--text-secondary);
        }
        .intro-content .feature-list li i { color: var(--accent); font-size: 1rem; width: 20px; }
        .intro-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
        .intro-image img { width: 100%; height: auto; display: block; }

        /* ===== 分类卡片 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .category-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform var(--transition), box-shadow var(--transition);
            border: 1px solid var(--border-card);
            cursor: pointer;
        }
        .category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .category-card .card-img {
            height: 180px;
            overflow: hidden;
            background: var(--primary-light);
        }
        .category-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
        .category-card:hover .card-img img { transform: scale(1.05); }
        .category-card .card-body { padding: 22px 24px 26px; }
        .category-card .card-body h3 { margin-bottom: 8px; font-size: 1.2rem; }
        .category-card .card-body p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; margin-bottom: 16px; }
        .category-card .card-tag {
            display: inline-block;
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 50px;
        }

        /* ===== 资讯列表 ===== */
        .post-list { display: flex; flex-direction: column; gap: 20px; }
        .post-item {
            display: flex;
            gap: 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-card);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .post-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
        .post-item .post-thumb {
            width: 120px;
            min-height: 80px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--primary-light);
        }
        .post-item .post-thumb img { width: 100%; height: 100%; object-fit: cover; }
        .post-item .post-info { flex: 1; }
        .post-item .post-info h3 { font-size: 1.1rem; margin-bottom: 6px; }
        .post-item .post-info h3 a { color: var(--text-primary); }
        .post-item .post-info h3 a:hover { color: var(--accent); }
        .post-item .post-info p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; margin-bottom: 8px; }
        .post-item .post-meta {
            display: flex;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .post-item .post-meta span { display: flex; align-items: center; gap: 4px; }
        .post-item .post-meta .cat { background: var(--accent-soft); color: var(--accent); padding: 1px 10px; border-radius: 50px; font-weight: 500; }
        .post-empty {
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-light);
        }
        .post-empty i { font-size: 2.4rem; margin-bottom: 12px; opacity: 0.5; }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-card);
            transition: transform var(--transition);
            position: relative;
        }
        .step-card:hover { transform: translateY(-4px); }
        .step-card .step-num {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 16px var(--accent-glow);
        }
        .step-card h3 { margin-bottom: 8px; font-size: 1.1rem; }
        .step-card p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; }
        .step-connector { display: none; }

        /* ===== 特色卡片 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 30px 24px;
            text-align: center;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-card);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .feature-card .icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: var(--accent-soft);
            color: var(--accent);
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            transition: background var(--transition), color var(--transition);
        }
        .feature-card:hover .icon { background: var(--accent); color: #fff; }
        .feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
        .feature-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-card);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            background: none;
            text-align: left;
            transition: background var(--transition);
        }
        .faq-question:hover { background: rgba(0,0,0,0.02); }
        .faq-question i { color: var(--accent); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-question.open i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 22px 18px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
            display: none;
        }
        .faq-answer.open { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            text-align: center;
            padding: 80px 0;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(10,20,33,0.8);
            z-index: 1;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { color: #fff; font-size: 2.2rem; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.7); max-width: 520px; margin: 0 auto 28px; font-size: 1.05rem; }
        .cta-section .btn-cta {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 16px 48px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            box-shadow: 0 4px 24px rgba(59,130,246,0.35);
        }
        .cta-section .btn-cta:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 36px rgba(59,130,246,0.45); }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-sidebar);
            color: var(--text-sidebar);
            padding: 40px 0 20px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 28px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .footer-brand .logo { font-size: 1.2rem; font-weight: 800; color: #fff; margin-bottom: 8px; }
        .footer-brand .logo span { color: var(--accent); }
        .footer-brand p { font-size: 0.88rem; color: rgba(255,255,255,0.5); line-height: 1.7; max-width: 360px; }
        .footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 14px; }
        .footer a { color: rgba(255,255,255,0.5); font-size: 0.88rem; display: block; padding: 3px 0; transition: color var(--transition); }
        .footer a:hover { color: var(--accent); }
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.3);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .intro-grid { grid-template-columns: 1fr; gap: 32px; }
            .intro-image { order: -1; }
            .steps-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            :root { --sidebar-width: 0px; }
            .sidebar { transform: translateX(-100%); }
            .sidebar.open { transform: translateX(0); }
            .mobile-header { display: flex; }
            .main-content { margin-left: 0; padding-top: var(--header-height); }
            .sidebar-overlay.open { display: block; }

            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .hero { padding: 48px 0 56px; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero-actions .btn-primary, .hero-actions .btn-outline { padding: 12px 28px; font-size: 0.92rem; }

            .section { padding: 48px 0; }
            .section-header { margin-bottom: 32px; }

            .category-grid { grid-template-columns: 1fr 1fr; }
            .features-grid { grid-template-columns: 1fr 1fr; }
            .steps-grid { grid-template-columns: 1fr; gap: 20px; }

            .post-item { flex-direction: column; padding: 16px; }
            .post-item .post-thumb { width: 100%; height: 160px; }

            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .cta-section { padding: 56px 0; }
            .cta-section h2 { font-size: 1.6rem; }
        }

        @media (max-width: 520px) {
            .category-grid { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn-primary, .hero-actions .btn-outline { width: 100%; text-align: center; }
            .container { padding-left: 16px; padding-right: 16px; }
            .hero h1 { font-size: 1.7rem; }
            .post-item .post-thumb { height: 120px; }
        }

        /* ===== 工具类 ===== */
        .text-center { text-align: center; }
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }
        .gap-1 { gap: 8px; }
        .gap-2 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a73e8;
            --primary-dark: #0d47a1;
            --primary-light: #e8f0fe;
            --secondary: #ff6d00;
            --secondary-light: #fff3e0;
            --accent: #00c853;
            --bg: #f8fafc;
            --bg-card: #ffffff;
            --bg-sidebar: #0f172a;
            --bg-sidebar-hover: #1e293b;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.10);
            --shadow-sidebar: 2px 0 20px rgba(0, 0, 0, 0.08);
            --transition: 0.25s ease;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --sidebar-width: 240px;
            --sidebar-collapsed: 64px;
            --header-height: 0px;
            --max-width: 1200px;
            --gap: 32px;
            --gap-sm: 20px;
        }

        /* ===== 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);
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        h1 {
            font-size: 2.6rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 0.75rem;
            color: var(--text-light);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--gap);
        }

        /* ===== 左侧边栏 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            box-shadow: var(--shadow-sidebar);
            transition: transform var(--transition), width var(--transition);
            overflow-y: auto;
        }
        .sidebar-brand {
            padding: 24px 20px 12px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .sidebar-brand .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: -0.5px;
        }
        .sidebar-brand .logo span {
            color: var(--secondary);
        }
        .sidebar-brand .logo-sub {
            font-size: 0.75rem;
            color: #94a3b8;
            margin-top: 2px;
            font-weight: 400;
        }
        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #64748b;
            padding: 8px 12px 6px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            color: #cbd5e1;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
            color: #64748b;
            transition: var(--transition);
        }
        .sidebar-nav a:hover {
            background: var(--bg-sidebar-hover);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--secondary);
        }
        .sidebar-nav a.active {
            background: rgba(26, 115, 232, 0.2);
            color: #fff;
            font-weight: 600;
        }
        .sidebar-nav a.active i {
            color: var(--primary);
        }
        .sidebar-nav a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: #475569;
            text-align: center;
        }

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

        /* ===== 移动端菜单按钮 ===== */
        .mobile-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--bg-sidebar);
            color: #fff;
            border: none;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            background: var(--bg-sidebar-hover);
        }
        .mobile-toggle:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            backdrop-filter: blur(2px);
        }

        /* ===== Hero / Banner ===== */
        .category-banner {
            position: relative;
            padding: 80px 0 70px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0d47a1 100%);
            color: #fff;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
        }
        .category-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .category-banner h1 i {
            color: var(--secondary);
            margin-right: 10px;
        }
        .category-banner p {
            font-size: 1.15rem;
            color: #cbd5e1;
            max-width: 720px;
            line-height: 1.7;
            margin-bottom: 0;
        }
        .category-banner .banner-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 24px;
        }
        .category-banner .banner-tags span {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(4px);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #e2e8f0;
            font-weight: 500;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 64px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
        .section-header p {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-header .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }
        .bg-white {
            background: var(--bg-card);
        }
        .bg-light {
            background: var(--bg);
        }
        .bg-gradient {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            color: #fff;
        }
        .bg-gradient .section-header h2 {
            color: #fff;
        }
        .bg-gradient .section-header p {
            color: #cbd5e1;
        }
        .bg-gradient .section-header .badge {
            background: rgba(255, 255, 255, 0.12);
            color: #e2e8f0;
        }

        /* ===== 卡片网格 ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap);
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }

        /* ===== 卡片组件 ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 28px 24px;
            transition: var(--transition);
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: #fff;
            margin-bottom: 18px;
            background: var(--primary);
        }
        .card .card-icon.orange {
            background: var(--secondary);
        }
        .card .card-icon.green {
            background: var(--accent);
        }
        .card .card-icon.purple {
            background: #7c3aed;
        }
        .card .card-icon.teal {
            background: #0d9488;
        }
        .card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .card p {
            font-size: 0.92rem;
            color: var(--text-light);
            flex: 1;
            margin-bottom: 16px;
        }
        .card .card-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            align-self: flex-start;
        }
        .card .card-link {
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: auto;
        }
        .card .card-link i {
            font-size: 0.8rem;
            transition: var(--transition);
        }
        .card .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== 图文卡片（大） ===== */
        .feature-card {
            display: flex;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .feature-card .feature-img {
            width: 40%;
            min-height: 240px;
            object-fit: cover;
            flex-shrink: 0;
        }
        .feature-card .feature-body {
            padding: 32px 28px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .feature-card .feature-body h3 {
            font-size: 1.4rem;
            margin-bottom: 10px;
        }
        .feature-card .feature-body p {
            color: var(--text-light);
            max-width: 480px;
        }
        .feature-card .feature-body .btn {
            align-self: flex-start;
            margin-top: 12px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            background: var(--primary);
            color: #fff;
            text-decoration: none;
        }
        .btn:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 115, 232, 0.35);
        }
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .btn-secondary {
            background: var(--secondary);
        }
        .btn-secondary:hover {
            background: #e65100;
            box-shadow: 0 8px 24px rgba(255, 109, 0, 0.35);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 24px rgba(26, 115, 232, 0.25);
        }
        .btn-white {
            background: #fff;
            color: var(--text);
        }
        .btn-white:hover {
            background: #f1f5f9;
            color: var(--text);
            box-shadow: 0 8px 24px rgba(255, 255, 255, 0.3);
        }
        .btn-sm {
            padding: 6px 18px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 14px 36px;
            font-size: 1.05rem;
        }

        /* ===== 标签/徽章 ===== */
        .badge-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
        }
        .badge-tag.orange {
            background: var(--secondary-light);
            color: var(--secondary);
        }
        .badge-tag.green {
            background: #e8f5e9;
            color: #2e7d32;
        }

        /* ===== 统计数字 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
            text-align: center;
        }
        .stat-item {
            padding: 24px 12px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .stat-item .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .stat-item .stat-number span {
            color: var(--secondary);
        }
        .stat-item .stat-label {
            font-size: 0.9rem;
            color: #94a3b8;
            margin-top: 4px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary);
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text);
            transition: var(--transition);
            gap: 16px;
        }
        .faq-question i {
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-question[aria-expanded="true"] i {
            transform: rotate(180deg);
        }
        .faq-question:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: -2px;
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }
        .faq-answer p {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 72px 0;
            text-align: center;
            background: linear-gradient(135deg, #0d47a1 0%, #1a73e8 100%);
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: #e0e7ff;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn {
            background: #fff;
            color: var(--primary);
        }
        .cta-section .btn:hover {
            background: #e8f0fe;
            color: var(--primary-dark);
            box-shadow: 0 8px 24px rgba(255, 255, 255, 0.3);
        }

        /* ===== 内容列表 ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-item {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            border: 1px solid var(--border);
            transition: var(--transition);
            align-items: flex-start;
        }
        .content-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
            transform: translateX(4px);
        }
        .content-item .item-index {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            min-width: 36px;
            opacity: 0.6;
        }
        .content-item .item-body h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .content-item .item-body p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 0;
        }
        .content-item .item-tag {
            flex-shrink: 0;
            margin-left: auto;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-sidebar);
            color: var(--text-white);
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer .footer-brand .logo {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
        }
        .footer .footer-brand .logo span {
            color: var(--secondary);
        }
        .footer .footer-brand p {
            color: #94a3b8;
            font-size: 0.9rem;
            max-width: 320px;
            margin-top: 6px;
        }
        .footer h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer a {
            display: block;
            color: #94a3b8;
            font-size: 0.88rem;
            margin-bottom: 8px;
            transition: var(--transition);
        }
        .footer a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer .footer-bottom {
            text-align: center;
            padding-top: 24px;
            font-size: 0.8rem;
            color: #475569;
        }
        .footer .footer-bottom a {
            display: inline;
            color: #64748b;
            margin: 0 4px;
        }
        .footer .footer-bottom a:hover {
            color: #fff;
            padding-left: 0;
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            align-items: center;
            padding: 16px 0 0;
            font-size: 0.88rem;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: #94a3b8;
        }
        .breadcrumb span {
            color: var(--text);
            font-weight: 500;
        }

        /* ===== 响应式 ===== */

        /* 平板 1024px */
        @media (max-width: 1024px) {
            :root {
                --gap: 24px;
            }
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-banner h1 {
                font-size: 2.2rem;
            }
            .feature-card .feature-img {
                width: 35%;
                min-height: 200px;
            }
            .feature-card .feature-body {
                padding: 24px 20px;
            }
        }

        /* 平板 768px */
        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
                --gap: 20px;
            }
            body {
                flex-direction: column;
            }
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .overlay.active {
                display: block;
            }
            .category-banner {
                padding: 60px 0 50px;
                min-height: 240px;
            }
            .category-banner h1 {
                font-size: 1.8rem;
            }
            .category-banner p {
                font-size: 1rem;
            }
            .grid-3,
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .section {
                padding: 44px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .feature-card {
                flex-direction: column;
            }
            .feature-card .feature-img {
                width: 100%;
                min-height: 180px;
                max-height: 220px;
            }
            .feature-card .feature-body {
                padding: 20px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item .stat-number {
                font-size: 1.8rem;
            }
            .footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer .footer-brand p {
                max-width: 100%;
            }
            .content-item {
                flex-direction: column;
                gap: 8px;
                padding: 16px 18px;
            }
            .content-item .item-tag {
                margin-left: 0;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px 14px;
            }
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .btn-lg {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
        }

        /* 手机 520px */
        @media (max-width: 520px) {
            .category-banner h1 {
                font-size: 1.5rem;
            }
            .category-banner p {
                font-size: 0.92rem;
            }
            .category-banner .banner-tags span {
                font-size: 0.75rem;
                padding: 4px 12px;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .stat-item {
                padding: 16px 8px;
            }
            .stat-item .stat-number {
                font-size: 1.5rem;
            }
            .section-header h2 {
                font-size: 1.35rem;
            }
            .card {
                padding: 20px 16px;
            }
            .card .card-icon {
                width: 42px;
                height: 42px;
                font-size: 1.2rem;
                margin-bottom: 12px;
            }
            .container {
                padding: 0 16px;
            }
            .breadcrumb {
                font-size: 0.78rem;
                gap: 4px 8px;
            }
            .footer {
                padding: 32px 0 16px;
            }
            .footer .footer-grid {
                gap: 20px;
            }
            .sidebar {
                width: 260px;
            }
            .mobile-toggle {
                top: 12px;
                left: 12px;
                width: 40px;
                height: 40px;
                font-size: 1.1rem;
            }
        }

        /* ===== 滚动条美化 ===== */
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: #334155;
            border-radius: 4px;
        }
        .sidebar::-webkit-scrollbar-thumb:hover {
            background: #475569;
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 8px;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mt-3 {
            margin-top: 24px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .gap-2 {
            gap: 12px;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .justify-center {
            justify-content: center;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --primary-bg: #eef2ff;
            --secondary: #0f172a;
            --secondary-light: #1e293b;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --success: #10b981;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-dark: #0b1120;
            --text: #0f172a;
            --text-light: #475569;
            --text-lighter: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.18);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --sidebar-w: 240px;
            --header-h: 0px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            display: flex;
            min-height: 100vh;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--text); font-weight: 700; }
        h1 { font-size: 2.2rem; }
        h2 { font-size: 1.6rem; }
        h3 { font-size: 1.25rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

        /* ===== 左侧导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-w);
            height: 100vh;
            background: var(--bg-dark);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            padding: 28px 0;
            z-index: 1000;
            overflow-y: auto;
            transition: transform var(--transition);
        }
        .sidebar-logo {
            padding: 0 24px 24px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
            margin-bottom: 20px;
        }
        .sidebar-logo .logo {
            font-size: 1.4rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .sidebar-logo .logo span { color: var(--accent); }
        .sidebar-logo .logo-sub {
            font-size: 0.75rem;
            color: var(--text-lighter);
            margin-top: 2px;
            letter-spacing: 0.3px;
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 2px;
            padding: 0 12px;
            flex: 1;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-lighter);
            padding: 8px 12px 6px;
            opacity: 0.6;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-size: 0.9rem;
            font-weight: 500;
            transition: all var(--transition);
        }
        .sidebar-nav a i { width: 20px; text-align: center; font-size: 1rem; 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(--accent); }
        .sidebar-nav a.active { background: rgba(37,99,235,0.2); color: #fff; }
        .sidebar-nav a.active i { color: var(--primary-light); }

        .sidebar-footer {
            padding: 20px 24px 12px;
            border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 0.7rem;
            color: var(--text-lighter);
            text-align: center;
            opacity: 0.6;
        }

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

        /* ===== 移动端菜单切换 ===== */
        .menu-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--bg-dark);
            color: #fff;
            border: none;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: var(--shadow);
            transition: background var(--transition);
            align-items: center;
            justify-content: center;
        }
        .menu-toggle:hover { background: var(--secondary-light); }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }
        .sidebar-overlay.show { opacity: 1; pointer-events: auto; }

        /* ===== 文章Banner ===== */
        .article-banner {
            position: relative;
            padding: 80px 0 60px;
            background: var(--bg-dark) url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,17,32,0.88) 0%, rgba(11,17,32,0.6) 100%);
            z-index: 1;
        }
        .article-banner .container { position: relative; z-index: 2; text-align: center; }
        .article-banner .category-badge {
            display: inline-block;
            background: var(--accent);
            color: #0b1120;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.3px;
            margin-bottom: 16px;
        }
        .article-banner h1 {
            color: #fff;
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            max-width: 800px;
            margin: 0 auto;
            text-shadow: 0 2px 12px rgba(0,0,0,0.3);
        }

        /* ===== 面包屑 ===== */
        .breadcrumb-wrap {
            background: var(--bg-alt);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
        }
        .breadcrumb-wrap .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-lighter);
        }
        .breadcrumb-wrap .breadcrumb a { color: var(--text-light); }
        .breadcrumb-wrap .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb-wrap .breadcrumb .sep { color: var(--border); font-size: 0.7rem; }
        .breadcrumb-wrap .breadcrumb .current { color: var(--text); font-weight: 600; }

        /* ===== 文章主体 ===== */
        .article-section {
            padding: 48px 0 40px;
            background: var(--bg);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
        }
        .article-main { min-width: 0; }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            margin-bottom: 24px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--text-lighter);
        }
        .article-meta .meta-item i { font-size: 0.9rem; color: var(--primary-light); }
        .article-meta .meta-item .cat-link {
            background: var(--primary-bg);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.8rem;
        }
        .article-feature-img {
            margin-bottom: 28px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-feature-img img { width: 100%; display: block; }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body p { margin-bottom: 1.2rem; color: var(--text); }
        .article-body h2, .article-body h3 { margin-top: 2rem; margin-bottom: 1rem; }
        .article-body ul, .article-body ol { margin-bottom: 1.2rem; padding-left: 1.5rem; }
        .article-body li { margin-bottom: 0.4rem; color: var(--text-light); list-style: disc; }
        .article-body a { color: var(--primary); text-decoration: underline; }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 24px;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: normal;
        }
        .article-body blockquote p { margin-bottom: 0; color: var(--text); }
        .article-body img { margin: 1.5rem auto; border-radius: var(--radius); box-shadow: var(--shadow-sm); }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid var(--border);
        }
        .article-tags .tag {
            background: var(--bg-alt);
            color: var(--text-light);
            padding: 4px 14px;
            border-radius: 16px;
            font-size: 0.8rem;
            font-weight: 500;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .article-tags .tag:hover { background: var(--primary-bg); color: var(--primary); border-color: var(--primary-light); }

        /* ===== 侧边栏（文章页） ===== */
        .article-sidebar .sidebar-card {
            background: var(--bg-alt);
            border-radius: var(--radius);
            padding: 24px;
            border: 1px solid var(--border);
            margin-bottom: 24px;
        }
        .article-sidebar .sidebar-card h3 {
            font-size: 1rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .article-sidebar .sidebar-card h3 i { color: var(--primary); font-size: 1.1rem; }
        .article-sidebar .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .article-sidebar .sidebar-list a:last-child { border-bottom: none; }
        .article-sidebar .sidebar-list a:hover { padding-left: 4px; }
        .article-sidebar .sidebar-list .list-img {
            width: 60px;
            height: 45px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--border);
        }
        .article-sidebar .sidebar-list .list-text { flex: 1; }
        .article-sidebar .sidebar-list .list-text .ltitle {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            line-height: 1.4;
        }
        .article-sidebar .sidebar-list .list-text .ldate {
            font-size: 0.75rem;
            color: var(--text-lighter);
            margin-top: 4px;
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 48px 0;
            background: var(--bg-alt);
            border-top: 1px solid var(--border);
        }
        .related-section .section-title {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 28px;
        }
        .related-section .section-title i { color: var(--primary); font-size: 1.3rem; }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .related-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: var(--primary-light); }
        .related-card .rc-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--border);
        }
        .related-card .rc-body { padding: 18px 20px 20px; }
        .related-card .rc-cat {
            font-size: 0.7rem;
            color: var(--primary);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.3px;
            margin-bottom: 6px;
        }
        .related-card .rc-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            line-height: 1.4;
            margin-bottom: 8px;
        }
        .related-card .rc-title a { color: inherit; }
        .related-card .rc-title a:hover { color: var(--primary); }
        .related-card .rc-meta {
            font-size: 0.8rem;
            color: var(--text-lighter);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 60px 0;
            background: var(--bg-dark) url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,17,32,0.9) 0%, rgba(11,17,32,0.7) 100%);
        }
        .cta-section .container { position: relative; z-index: 2; text-align: center; }
        .cta-section h2 { color: #fff; font-size: 1.8rem; margin-bottom: 12px; }
        .cta-section p { color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 28px; font-size: 1.05rem; }
        .cta-btn {
            display: inline-block;
            background: var(--accent);
            color: #0b1120;
            padding: 14px 40px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition);
            box-shadow: 0 4px 20px rgba(245,158,11,0.35);
        }
        .cta-btn:hover { background: #fff; color: #0b1120; transform: translateY(-2px); box-shadow: 0 8px 30px rgba(245,158,11,0.45); }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 60px 20px;
        }
        .not-found-box .nf-icon { font-size: 3.6rem; color: var(--text-lighter); margin-bottom: 16px; }
        .not-found-box h2 { font-size: 1.5rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-light); margin-bottom: 24px; }
        .not-found-box .back-link {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: background var(--transition);
        }
        .not-found-box .back-link:hover { background: var(--primary-dark); }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer .footer-brand .logo { font-size: 1.5rem; font-weight: 800; color: #fff; }
        .footer .footer-brand .logo span { color: var(--accent); }
        .footer .footer-brand p { font-size: 0.85rem; color: rgba(255,255,255,0.5); max-width: 360px; }
        .footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; font-weight: 600; }
        .footer a { display: block; color: rgba(255,255,255,0.5); font-size: 0.85rem; padding: 4px 0; transition: color var(--transition); }
        .footer a:hover { color: var(--accent); }
        .footer .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 20px;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.35);
            text-align: center;
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .sidebar { transform: translateX(-100%); }
            .sidebar.open { transform: translateX(0); }
            .menu-toggle { display: flex; }
            .sidebar-overlay { display: block; }
            .main-content { margin-left: 0; }
            .article-banner { padding: 60px 0 40px; min-height: 200px; }
            .article-banner h1 { font-size: 1.6rem; }
            .footer .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .related-grid { grid-template-columns: 1fr; }
            .article-sidebar { grid-template-columns: 1fr; }
            .article-section { padding: 32px 0; }
            .cta-section h2 { font-size: 1.4rem; }
            .article-body { font-size: 1rem; }
        }

        @media (max-width: 520px) {
            .article-banner h1 { font-size: 1.3rem; }
            .article-meta { flex-direction: column; align-items: flex-start; gap: 8px; }
            .container { padding: 0 16px; }
            .related-card .rc-img { height: 160px; }
            .cta-btn { padding: 12px 28px; font-size: 0.9rem; }
        }

        /* ===== 工具类 ===== */
        .text-center { text-align: center; }
        .mt-1 { margin-top: 0.5rem; }
        .mt-2 { margin-top: 1rem; }
        .mb-1 { margin-bottom: 0.5rem; }
        .mb-2 { margin-bottom: 1rem; }
        .gap-1 { gap: 0.5rem; }
        .gap-2 { gap: 1rem; }