:root {
            --primary: #1e3a8a;
            --primary-hover: #2563eb;
            --bg: #f8fafc;
            --text: #0f172a;
            --text-soft: #475569;
            --card-bg: #ffffff;
            --border: #e9eef3;
            --shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        @import url('https://fonts.googleapis.com/css2?family=Inter:opsz,wght@14..32,400;14..32,500;14..32,600;14..32,700&display=swap');

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-block {
            margin-top: 4.5rem;
            margin-bottom: 3rem;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            text-align: center;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #0f172a 0%, #2c3e66 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.8rem;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, #2563eb, #7c3aed);
            border-radius: 4px;
            margin: 0.8rem auto 1.5rem;
        }
        .section-sub {
            text-align: center;
            color: var(--text-soft);
            margin-bottom: 2.5rem;
            max-width: 680px;
            margin-left: auto;
            margin-right: auto;
            font-size: 1.05rem;
        }

        /* 导航栏 (与首页统一) */
        .navbar {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            box-shadow: 0 4px 20px rgba(0,0,0,0.04);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid rgba(226,232,240,0.8);
        }
        .nav-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 0.7rem 0;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo-icon {
            background: linear-gradient(135deg, #1e3c72, #2a5298);
            width: 40px;
            height: 40px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 700;
            font-size: 22px;
            box-shadow: 0 4px 10px rgba(30,60,114,0.3);
        }
        .logo-text {
            font-size: 1.6rem;
            font-weight: 700;
            background: linear-gradient(120deg, #0f2b4d, #1f6392);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-links {
            display: flex;
            gap: 28px;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links a {
            text-decoration: none;
            font-weight: 500;
            color: #1e293b;
            transition: color 0.2s, transform 0.2s;
            font-size: 0.95rem;
            position: relative;
            padding: 0.25rem 0;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary-hover);
            transform: translateY(-1px);
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary-hover);
            border-radius: 2px;
        }

        /* 页面头部 */
        .page-header {
            background: linear-gradient(135deg, #f0f4ff 0%, #ffffff 60%, #f1f5f9 100%);
            padding: 3rem 0 2.5rem;
            text-align: center;
            border-bottom: 1px solid #e9eef3;
            margin-bottom: 3rem;
        }
        .page-header h1 {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(to right, #0c4a6e, #2563eb);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.8rem;
        }
        .page-header p {
            font-size: 1.1rem;
            color: #475569;
            max-width: 650px;
            margin: 0 auto;
        }

        /* 卡片通用 */
        .card {
            background: var(--card-bg);
            border-radius: 1.8rem;
            padding: 2rem;
            box-shadow: var(--shadow);
            border: 1px solid #f1f5f9;
            transition: transform 0.25s;
        }
        .card:hover {
            transform: translateY(-4px);
        }

        /* 订阅机制讲解 */
        .mechanism-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin-top: 1rem;
        }
        .mechanism-item {
            display: flex;
            gap: 1.2rem;
            align-items: flex-start;
        }
        .mechanism-icon {
            font-size: 2.2rem;
            color: var(--primary-hover);
            background: #eef2ff;
            border-radius: 1rem;
            padding: 0.8rem;
            flex-shrink: 0;
        }

        /* 对比表格 */
        .compare-wrapper {
            overflow-x: auto;
            border-radius: 1.5rem;
            box-shadow: 0 12px 30px rgba(0,0,0,0.05);
            background: white;
        }
        table {
            width: 100%;
            border-collapse: collapse;
        }
        th {
            background: #f8fafc;
            padding: 1.2rem 1rem;
            font-weight: 600;
            color: #1e293b;
            text-align: left;
            border-bottom: 2px solid #e2e8f0;
        }
        td {
            padding: 1rem 1rem;
            border-bottom: 1px solid #f1f5f9;
            color: #334155;
        }
        .tag {
            padding: 4px 12px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            white-space: nowrap;
            display: inline-block;
        }
        .tag-blue { background: #dbeafe; color: #1e40af; }
        .tag-orange { background: #ffedd5; color: #c2410c; }
        .tag-purple { background: #ede9fe; color: #6d28d9; }
        .tag-green { background: #d1fae5; color: #065f46; }

        /* 步骤卡片 */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.5rem;
        }
        .step-card {
            background: white;
            border-radius: 1.8rem;
            padding: 2rem 1.5rem;
            box-shadow: var(--shadow);
            border-top: 4px solid var(--primary-hover);
            text-align: center;
        }
        .step-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: #e2e8f0;
            line-height: 1;
        }
        .step-icon {
            font-size: 2rem;
            color: var(--primary-hover);
            margin: 0.5rem 0 1rem;
        }

        /* FAQ 网格 */
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.2rem;
        }
        .faq-item {
            background: white;
            border-radius: 1.2rem;
            padding: 1.5rem;
            border-left: 4px solid #3b82f6;
            box-shadow: 0 4px 12px rgba(0,0,0,0.03);
        }
        .faq-item strong {
            display: block;
            margin-bottom: 0.5rem;
        }

        /* CTA 底部 */
        .cta-banner {
            background: linear-gradient(105deg, #eef2ff 0%, #ffffff 80%);
            border-radius: 2rem;
            padding: 2.5rem 2rem;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
            border: 1px solid #e0e7ff;
            margin: 3rem 0 2rem;
        }
        .btn-primary {
            background: #1e3a8a;
            color: white;
            padding: 14px 32px;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.25s;
            box-shadow: 0 4px 12px rgba(30,58,138,0.2);
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: #2563eb;
            transform: translateY(-2px);
            box-shadow: 0 16px 28px -8px rgba(37,99,235,0.4);
        }
        .btn-outline {
            background: white;
            border: 1px solid #cbd5e1;
            padding: 14px 32px;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            color: #1e293b;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: 0.2s;
        }
        .btn-outline:hover {
            border-color: #2563eb;
            color: #1e3a8a;
        }

        /* 页脚 */
        .footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 2rem 0;
            text-align: center;
            margin-top: 3rem;
        }
        .footer a {
            color: #94a3b8;
            text-decoration: none;
        }
        .footer a:hover {
            color: white;
        }

        @media (max-width: 768px) {
            .mechanism-grid {
                grid-template-columns: 1fr;
            }
            .nav-flex {
                flex-direction: column;
                gap: 12px;
            }
            .page-header h1 {
                font-size: 2rem;
            }
        }