:root { --primary: #0066ff; --dark: #1a1a1a; --light: #f8f9fa; --text: #333; --gap: 20px; }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; color: var(--text); background: #fff; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { padding: 20px 0; background: #fff; position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid #eee; }
        .nav-flex { display: flex; justify-content: space-between; align-items: center; }
        .nav-links { display: flex; gap: 0; align-items: center; }
        .nav-links a { padding: 10px 15px; text-decoration: none; color: var(--dark); font-weight: 500; }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(135deg, #f0f4ff 0%, #ffffff 100%); }
        h1 { font-size: 2.5rem; margin-bottom: 20px; color: var(--dark); }
        .btn { display: inline-block; padding: 12px 30px; background: var(--primary); color: #fff; text-decoration: none; border-radius: 5px; transition: 0.3s; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--gap); padding: 50px 0; }
        .card { padding: 30px; border: 1px solid #eee; border-radius: 10px; transition: 0.3s; }
        .card:hover { box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
        table { width: 100%; border-collapse: collapse; margin: 20px 0; }
        th, td { padding: 12px; border: 1px solid #ddd; text-align: left; }
        .faq-item { margin-bottom: 15px; border-bottom: 1px solid #eee; padding-bottom: 10px; }
        footer { background: var(--dark); color: #ccc; padding: 40px 0; text-align: center; }
        .float-kefu { position: fixed; right: 20px; bottom: 50px; z-index: 999; }
        @media (max-width: 768px) { .nav-links { display: none; } }