:root { --primary-color: #2563eb; --text-color: #1f2937; --bg-color: #ffffff; --accent-color: #f59e0b; }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--text-color); background: #f8fafc; line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: #fff; padding: 15px 0; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
        nav { display: flex; align-items: center; justify-content: space-between; }
        .nav-links { display: flex; gap: 0; list-style: none; }
        .nav-links a { padding: 10px 15px; text-decoration: none; color: #374151; font-weight: 500; font-size: 14px; }
        .hero { padding: 80px 0; text-align: center; background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%); }
        .hero h1 { font-size: 3rem; margin-bottom: 20px; color: #1e3a8a; }
        .btn { display: inline-block; padding: 12px 30px; background: var(--primary-color); color: white; border-radius: 8px; text-decoration: none; font-weight: 600; transition: transform 0.2s; }
        .section { padding: 60px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: #fff; padding: 30px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); transition: 0.3s; }
        .card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px rgba(0,0,0,0.1); }
        .faq-item { margin-bottom: 15px; border-bottom: 1px solid #e5e7eb; }
        .faq-question { width: 100%; text-align: left; padding: 15px; background: none; border: none; font-weight: 600; cursor: pointer; }
        .faq-answer { padding: 0 15px 15px; display: none; }
        footer { background: #1e293b; color: #cbd5e1; padding: 40px 0; text-align: center; }
        .float-kefu { position: fixed; right: 20px; bottom: 50px; z-index: 999; width: 100px; }