:root { --primary: #0052cc; --dark: #172b4d; --bg: #f4f7f9; --text: #333; }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; line-height: 1.6; color: var(--text); background: var(--bg); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: #fff; padding: 15px 0; border-bottom: 1px solid #ddd; position: sticky; top: 0; z-index: 1000; }
        .nav-inner { display: flex; align-items: center; justify-content: space-between; }
        .nav-links { display: flex; gap: 0; align-items: center; }
        .nav-links a { padding: 0 15px; text-decoration: none; color: var(--dark); font-weight: 500; font-size: 14px; }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(135deg, #0052cc 0%, #00a3ff 100%); color: #fff; }
        .hero h1 { font-size: 3rem; margin-bottom: 20px; }
        .btn-primary { background: #fff; color: var(--primary); padding: 12px 30px; border-radius: 5px; text-decoration: none; font-weight: bold; display: inline-block; transition: 0.3s; }
        .card { background: #fff; padding: 30px; border-radius: 10px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); transition: 0.3s; }
        .card:hover { transform: translateY(-5px); }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin: 40px 0; }
        table { width: 100%; border-collapse: collapse; background: #fff; }
        th, td { padding: 15px; border: 1px solid #eee; text-align: left; }
        footer { background: var(--dark); color: #ccc; padding: 40px 0; text-align: center; }
        .faq-item { margin-bottom: 10px; background: #fff; padding: 15px; border-radius: 5px; cursor: pointer; }
        .hidden { display: none; }