:root { --primary: #2563eb; --dark: #1e293b; --light: #f8fafc; --accent: #0ea5e9; }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; line-height: 1.6; color: #334155; background: #ffffff; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { padding: 20px 0; background: #fff; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; z-index: 1000; }
        .nav-wrapper { display: flex; justify-content: space-between; align-items: center; }
        .nav-links { display: flex; gap: 0; list-style: none; }
        .nav-links a { padding: 10px 15px; text-decoration: none; color: #475569; font-weight: 500; }
        .btn { padding: 10px 24px; border-radius: 6px; cursor: pointer; text-decoration: none; display: inline-block; transition: 0.3s; }
        .btn-primary { background: var(--primary); color: white; }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(135deg, #eff6ff 0%, #f1f5f9 100%); }
        h1 { font-size: 3rem; color: var(--dark); margin-bottom: 20px; }
        .section { padding: 60px 0; }
        .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { padding: 30px; border-radius: 12px; background: #fff; border: 1px solid #e2e8f0; transition: transform 0.3s; }
        .card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(0,0,0,0.05); }
        .faq-item { margin-bottom: 15px; border: 1px solid #e2e8f0; padding: 15px; border-radius: 8px; cursor: pointer; }
        footer { background: var(--dark); color: #cbd5e1; padding: 40px 0; text-align: center; }
        .footer-links a { color: #cbd5e1; margin: 0 10px; text-decoration: none; }
        .float-kefu { position: fixed; right: 20px; bottom: 50px; z-index: 999; }
        @media (max-width: 768px) { .nav-links { display: none; } }