:root {
            --blue: #2563eb;
            --blue-dark: #1d4ed8;
            --slate-900: #0f172a;
            --slate-700: #334155;
            --slate-500: #64748b;
            --slate-200: #e2e8f0;
            --slate-100: #f1f5f9;
            --slate-50: #f8fafc;
            --white: #fff;
            --amber: #f59e0b;
            --emerald: #10b981;
            --violet: #7c3aed;
            --radius-xl: 24px;
            --radius-lg: 16px;
            --radius-full: 50px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 20px 40px rgba(0,0,0,0.10);
            --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Helvetica, Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: var(--font-stack);
            background: var(--slate-50);
            color: var(--slate-900);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* 导航栏 - 与首页完全一致 */
        header {
            background: rgba(255,255,255,0.94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-sm);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            flex-wrap: wrap;
            gap: 12px;
        }
        .logo {
            font-size: 1.65rem;
            font-weight: 800;
            background: linear-gradient(135deg, #1e293b, #2563eb);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; font-size: 0.95rem; }
        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: var(--slate-700);
            transition: color 0.2s;
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a.active { color: var(--blue); }

        /* 按钮 */
        .btn {
            display: inline-block;
            font-weight: 600;
            padding: 13px 28px;
            border-radius: var(--radius-full);
            text-decoration: none;
            transition: all 0.25s;
            cursor: pointer;
            border: none;
            font-size: 0.95rem;
            text-align: center;
        }
        .btn-primary { background: var(--blue); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.25); }
        .btn-primary:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.35); }
        .btn-secondary { background: var(--slate-100); color: var(--slate-700); border: 1px solid var(--slate-200); }
        .btn-secondary:hover { background: #fff; border-color: var(--blue); }
        .btn-outline { background: transparent; color: var(--blue); border: 1.5px solid var(--blue); }
        .btn-outline:hover { background: #eff6ff; transform: translateY(-2px); }
        .btn-white { background: #fff; color: var(--slate-900); box-shadow: var(--shadow-md); }
        .btn-white:hover { background: #f1f5f9; }

        /* Hero */
        .page-hero {
            padding: 56px 0 40px;
            text-align: center;
            background: linear-gradient(160deg, #eff6ff 0%, #f0f9ff 40%, #faf5ff 100%);
        }
        .page-title { font-size: 2.4rem; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 12px; color: var(--slate-900); }
        .page-subtitle { color: var(--slate-500); font-size: 1.05rem; max-width: 700px; margin: 0 auto; }

        /* 三工具进阶能力对比 */
        .ability-section { padding: 40px 0; }
        .ability-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
        .ability-card {
            background: #fff;
            border-radius: var(--radius-xl);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
            border-top: 4px solid transparent;
        }
        .ability-card:nth-child(1) { border-top-color: var(--blue); }
        .ability-card:nth-child(2) { border-top-color: var(--amber); }
        .ability-card:nth-child(3) { border-top-color: var(--emerald); }
        .ability-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
        .ability-card .icon { font-size: 2.2rem; margin-bottom: 12px; }
        .ability-card h3 { font-size: 1.3rem; margin-bottom: 8px; }
        .ability-card p { color: var(--slate-500); font-size: 0.9rem; line-height: 1.5; }

        /* 通用区块标题 */
        .section-title { text-align: center; font-size: 2rem; font-weight: 700; margin-bottom: 8px; }
        .section-subtitle { text-align: center; color: var(--slate-500); margin-bottom: 40px; }

        /* TUN模式专题 */
        .tun-section { padding: 50px 0; background: #fff; }
        .tun-explain {
            background: var(--slate-50);
            border-radius: var(--radius-xl);
            padding: 28px 24px;
            margin-bottom: 32px;
            border-left: 5px solid var(--blue);
        }
        .tun-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
        .tun-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--slate-200);
            transition: all 0.2s;
        }
        .tun-card:hover { border-color: var(--blue); box-shadow: var(--shadow-md); }
        .tun-card h4 { font-size: 1.1rem; margin-bottom: 10px; }
        .tun-card p { font-size: 0.88rem; color: var(--slate-500); line-height: 1.6; }
        .tun-card .code-block {
            background: #1e293b;
            color: #e2e8f0;
            padding: 10px 14px;
            border-radius: 10px;
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 0.8rem;
            margin-top: 10px;
            word-break: break-all;
        }

        /* 分流规则玩法 */
        .rule-section { padding: 50px 0; }
        .rule-scenario { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
        .scenario-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: all 0.25s;
            border: 1px solid transparent;
        }
        .scenario-card:hover { border-color: var(--slate-200); transform: translateY(-2px); }
        .scenario-card .sc-icon { font-size: 2.2rem; margin-bottom: 10px; }
        .scenario-card h4 { font-weight: 700; margin-bottom: 6px; }
        .scenario-card p { font-size: 0.85rem; color: var(--slate-500); }
        .rule-tools { margin-top: 36px; display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
        .rule-tool {
            background: #f8fafc;
            border-radius: var(--radius-lg);
            padding: 20px;
            border: 1px solid var(--slate-200);
        }
        .rule-tool h4 { margin-bottom: 10px; }

        /* 配置文件拆解 */
        .config-section { padding: 50px 0; background: #fff; }
        .config-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
        .config-card {
            background: var(--slate-50);
            border-radius: var(--radius-lg);
            padding: 24px;
            border: 1px solid var(--slate-200);
        }
        .config-card h4 { margin-bottom: 14px; font-size: 1.1rem; }
        .config-card pre {
            background: #1e293b;
            color: #cbd5e1;
            padding: 16px;
            border-radius: 12px;
            font-size: 0.78rem;
            overflow-x: auto;
            white-space: pre-wrap;
            word-break: break-all;
            font-family: 'SF Mono', 'Fira Code', monospace;
            line-height: 1.5;
        }

        /* 高级技巧 */
        .tips-section { padding: 50px 0; }
        .tips-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
        .tip-item {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 22px 18px;
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: all 0.2s;
        }
        .tip-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
        .tip-item .tip-icon { font-size: 2.2rem; margin-bottom: 10px; }
        .tip-item h4 { font-size: 1.05rem; margin-bottom: 6px; }
        .tip-item p { font-size: 0.85rem; color: var(--slate-500); }

        /* 推荐阅读 */
        .readmore-section { padding: 40px 0; }
        .readmore-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
        .readmore-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 20px;
            text-decoration: none;
            color: var(--slate-900);
            box-shadow: var(--shadow-sm);
            transition: all 0.25s;
            border: 1px solid transparent;
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .readmore-card:hover { box-shadow: var(--shadow-md); border-color: var(--blue); transform: translateX(4px); }
        .readmore-card .rm-icon { font-size: 1.8rem; }
        .readmore-card strong { display: block; font-size: 0.95rem; }
        .readmore-card span { font-size: 0.78rem; color: var(--slate-500); }

        /* CTA */
        .cta-section {
            padding: 60px 0;
            text-align: center;
            background: linear-gradient(105deg, #0f172a 0%, #1e293b 100%);
            color: #fff;
            margin-top: 30px;
        }
        .cta-section h2 { font-size: 1.8rem; margin-bottom: 12px; letter-spacing: -0.5px; }
        .cta-section p { opacity: 0.85; margin-bottom: 24px; font-size: 0.95rem; }
        .cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

        /* Footer */
        footer { background: #0f172a; color: #94a3b8; padding: 40px 0 20px; font-size: 0.85rem; }
        .footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 28px; margin-bottom: 24px; }
        .footer-content h4 { color: #fff; margin-bottom: 10px; font-size: 0.9rem; }
        .footer-content ul { list-style: none; }
        .footer-content ul li { margin-bottom: 6px; }
        .footer-content ul li a { color: #94a3b8; text-decoration: none; transition: color 0.2s; }
        .footer-content ul li a:hover { color: #fff; }
        .footer-copyright { text-align: center; padding-top: 20px; border-top: 1px solid #1e293b; font-size: 0.8rem; }

        @media (max-width: 768px) {
            .page-title { font-size: 1.8rem; }
            nav { flex-direction: column; align-items: flex-start; }
            .nav-links { gap: 14px; font-size: 0.88rem; }
        }