:root { --primary: #6366f1; --accent: #a855f7; --text: #1f2937; --bg: #ffffff; }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; color: var(--text); line-height: 1.6; background: #f9fafb; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); position: fixed; top: 0; width: 100%; z-index: 1000; padding: 15px 0; border-bottom: 1px solid #e5e7eb; }
        .nav-wrapper { display: flex; justify-content: space-between; align-items: center; }
        .nav-links { display: flex; gap: 0; align-items: center; }
        .nav-links a { text-decoration: none; color: #4b5563; padding: 10px 15px; font-size: 14px; transition: 0.3s; }
        .nav-links a:hover { color: var(--primary); }
        .btn { padding: 10px 24px; border-radius: 8px; font-weight: 600; text-decoration: none; display: inline-block; transition: 0.3s; }
        .btn-primary { background: var(--primary); color: white; }
        .btn-primary:hover { opacity: 0.9; }
        .hero { padding: 140px 0 80px; text-align: center; background: linear-gradient(135deg, #f0f4ff 0%, #ffffff 100%); }
        h1 { font-size: 3rem; margin-bottom: 20px; background: linear-gradient(to right, #6366f1, #a855f7); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .section { padding: 60px 0; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: white; padding: 25px; border-radius: 16px; border: 1px solid #f3f4f6; transition: 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 #e5e7eb; border-radius: 8px; overflow: hidden; }
        .faq-q { padding: 15px; background: #f9fafb; cursor: pointer; font-weight: bold; }
        .faq-a { padding: 15px; display: none; }
        footer { background: #111827; color: #9ca3af; padding: 40px 0; text-align: center; }
        .footer-links { margin-bottom: 20px; }
        .footer-links a { color: #9ca3af; margin: 0 10px; text-decoration: none; }
        #kefu-float { position: fixed; right: 20px; bottom: 50px; z-index: 999; }
        table { width: 100%; border-collapse: collapse; margin-top: 20px; }
        th, td { padding: 12px; border: 1px solid #e5e7eb; text-align: left; }