/* ========== 全局重置 & 与首页完全统一的风格 ========== */
        *{margin:0;padding:0;box-sizing:border-box;}
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f9fafc;
            color: #0b1e33;
            line-height: 1.5;
            scroll-behavior: smooth;
        }
        .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
        
        /* 头部 — 毛玻璃现代 (同首页) */
        header {
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            position: sticky;
            top: 0;
            z-index: 50;
            border-bottom: 1px solid #eef2f6;
        }
        .header-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 14px 0;
        }
        .logo-area h1 {
            font-size: 1.9rem;
            font-weight: 750;
            background: linear-gradient(145deg, #0f2b4b, #2563eb);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
        }
        .logo-area p {
            font-size: 0.75rem;
            color: #54708f;
            margin-top: 4px;
            font-weight: 400;
            letter-spacing: 0.3px;
        }
        .nav-links {
            display: flex;
            gap: 1.4rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 530;
            color: #1e2f44;
            transition: color 0.15s;
            font-size: 0.95rem;
        }
        .nav-links a:hover, .nav-links a.active { color: #2563eb; }

        /* 页面标题 */
        .page-hero {
            text-align: center;
            margin: 48px 0 32px;
        }
        .page-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0b1e2e, #1e4bd2);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
        }
        .badge-rules {
            display: inline-block;
            background: #dbeafe;
            color: #1e4bd2;
            padding: 8px 28px;
            border-radius: 60px;
            font-weight: 650;
            margin-top: 16px;
            border: 1px solid #bdd3ff;
        }

        /* 什么是分流 + 规则类型卡片 */
        .intro-grid {
            display: grid;
            grid-template-columns: 1.2fr 2fr;
            gap: 30px;
            margin: 40px 0;
        }
        .what-card {
            background: white;
            border-radius: 36px;
            padding: 32px 30px;
            border: 1px solid #eaf0fa;
            box-shadow: 0 15px 25px -8px rgba(0,0,0,0.02);
        }
        .what-card h2 { font-size: 2rem; font-weight: 700; margin-bottom: 20px; }
        .type-grid {
            display: grid;
            grid-template-columns: repeat(3,1fr);
            gap: 16px;
        }
        .type-card {
            background: #f2f8ff;
            border-radius: 28px;
            padding: 22px 18px;
            border: 1px solid #cde0f5;
        }
        .type-card h3 { font-size: 1.5rem; margin-bottom: 8px; }
        .type-tag { background: #2563eb10; padding: 4px 12px; border-radius: 30px; display: inline-block; }

        /* 规则构建器 (可视化) + 可复制代码块 创意核心 */
        .builder-section {
            background: white;
            border-radius: 48px;
            padding: 40px 40px;
            margin: 50px 0;
            border: 1px solid #d9e6ff;
            box-shadow: 0 25px 40px -16px rgba(0,35,70,0.06);
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 30px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .rule-builder {
            display: flex;
            flex-wrap: wrap;
            gap: 20px 30px;
            align-items: flex-end;
            margin-bottom: 32px;
        }
        .builder-field {
            flex: 1;
            min-width: 180px;
        }
        .builder-field label {
            font-weight: 600;
            display: block;
            margin-bottom: 8px;
            color: #1e3b63;
        }
        .builder-field select, .builder-field input {
            width: 100%;
            padding: 14px 18px;
            border-radius: 40px;
            border: 1.5px solid #cbd5e1;
            font-size: 1rem;
            background: white;
        }
        .add-rule-btn {
            background: #1e3b63;
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 60px;
            font-weight: 700;
            cursor: pointer;
            transition: 0.15s;
        }
        .code-block-container {
            background: #0a1c2f;
            border-radius: 30px;
            padding: 24px 28px;
            margin: 24px 0 0;
            position: relative;
        }
        .code-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #bdd3ff;
            margin-bottom: 12px;
        }
        .copy-btn {
            background: #2563eb;
            color: white;
            border: none;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.15s;
        }
        .copy-btn:hover { background: #1e4bd2; }
        pre {
            color: #e2e8f0;
            font-family: 'SF Mono', monospace;
            font-size: 0.95rem;
            overflow-x: auto;
            white-space: pre-wrap;
            word-break: break-all;
        }

        /* 常见规则推荐 (可复制卡片) */
        .preset-grid {
            display: grid;
            grid-template-columns: repeat(2,1fr);
            gap: 24px;
            margin: 40px 0;
        }
        .preset-card {
            background: white;
            border-radius: 32px;
            padding: 28px 26px;
            border: 1px solid #eaf0fa;
            transition: 0.15s;
        }
        .preset-card:hover { box-shadow: 0 20px 30px -10px rgba(37,99,235,0.08); }
        .preset-title {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 12px;
            display: flex;
            gap: 10px;
        }
        .preset-desc { color: #365573; margin-bottom: 20px; }
        .preset-code {
            background: #f1f7fe;
            border-radius: 24px;
            padding: 16px 20px;
            font-family: monospace;
            font-size: 0.9rem;
            border: 1px solid #d4e2f5;
            white-space: pre-wrap;
        }
        .copy-preset {
            margin-top: 16px;
            background: transparent;
            border: 1.5px solid #2563eb;
            color: #2563eb;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
        }

        /* 号召下载区域 */
        .cta-rules {
            background: #0f2b4b;
            border-radius: 60px;
            padding: 48px 40px;
            margin: 60px 0 40px;
            color: white;
            text-align: center;
        }
        .cta-rules h3 { font-size: 2.5rem; font-weight: 700; margin-bottom: 20px; }
        .btn-light-large {
            background: white;
            color: #0f2b4b;
            padding: 16px 52px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.3rem;
            text-decoration: none;
            display: inline-block;
            margin-top: 20px;
            transition: 0.2s;
        }
        .btn-light-large:hover { background: #e0edff; transform: scale(1.02); }

        footer {
            background: #0b1a2a;
            color: #b0c7de;
            padding: 40px 0 24px;
            margin-top: 20px;
            border-top: 1px solid #1e3347;
        }
        .footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 32px; }
        .footer-copyright {
            text-align: center;
            padding-top: 32px;
            font-size: 0.85rem;
            border-top: 1px solid #1e3347;
            margin-top: 24px;
        }

        @media (max-width: 800px) {
            .intro-grid { grid-template-columns: 1fr; }
            .preset-grid { grid-template-columns: 1fr; }
            .type-grid { grid-template-columns: 1fr; }
        }