:root { --primary: #2563eb; --dark: #1e293b; --light: #f8fafc; --accent: #f59e0b; }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; color: #334155; background: #ffffff; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { 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; height: 70px; }
        .nav-links { display: flex; gap: 0; }
        .nav-links a { padding: 0 15px; text-decoration: none; color: #475569; font-weight: 500; font-size: 14px; }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(135deg, #eff6ff 0%, #fef3c7 100%); }
        h1 { font-size: 2.5rem; margin-bottom: 20px; color: var(--dark); }
        .btn { display: inline-block; padding: 12px 30px; background: var(--primary); color: #fff; border-radius: 8px; text-decoration: none; font-weight: 600; transition: transform 0.2s; }
        .btn:hover { transform: translateY(-2px); }
        section { padding: 60px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 30px; }
        .card { padding: 25px; border: 1px solid #e2e8f0; border-radius: 12px; background: #fff; transition: 0.3s; }
        .card:hover { box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
        table { width: 100%; border-collapse: collapse; margin-top: 20px; }
        th, td { padding: 12px; border: 1px solid #e2e8f0; text-align: left; }
        .faq-item { margin-bottom: 15px; border-bottom: 1px solid #e2e8f0; }
        .faq-q { cursor: pointer; padding: 15px 0; font-weight: bold; display: flex; justify-content: space-between; }
        .faq-a { display: none; padding-bottom: 15px; color: #64748b; }
        footer { background: var(--dark); color: #cbd5e1; padding: 40px 0; text-align: center; }
        .floating-kefu { position: fixed; bottom: 30px; right: 30px; z-index: 999; }