:root{
      --bg: #f6f7fb;
      --card: #ffffff;
      --text: #1a1e22;
      --muted: #5b5f66;
      --primary: #7a2bd9;
      --primary-dark:#5a1a8f;
      --accent: #e52e92;
      --shadow: 0 6px 18px rgba(0,0,0,.08);
      --radius: 12px;
    }
    *{box-sizing:border-box}
    html,body{margin:0;padding:0;font-family: system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Noto Sans CJK SC",sans-serif;background:var(--bg);color:var(--text);}
    img{max-width:100%;height:auto;display:block}
    a{color:inherit;text-decoration:none}
    header{position:sticky; top:0; z-index:999; background:rgba(255,255,255,.92); backdrop-filter: saturate(1.2) blur(6px); border-bottom:1px solid #eee}
    .container{max-width:1100px;margin:0 auto;padding:0 20px}
    .header-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
    .brand{display:flex;align-items:center;gap:12px}
    .brand .brand-name{font-weight:700;font-size:18px}
    .brand img{height:34px;width:auto}
    nav{display:flex;align-items:center}
    .nav-links{display:flex;gap:0;list-style:none;margin:0;padding:0}
    .nav-links li{margin-left:20px}
    .nav-links a{padding:12px 6px;border-radius:6px;color:#333;font-weight:600;transition:all .2s}
    .nav-links a:hover{background:rgba(122,43,217,.08);color:#111}
    .ai-page-home-link{color:var(--primary);font-weight:700}
    /* Hero Section (首屏，不含图片) */
    .hero{position:relative; padding:86px 0 60px; overflow:hidden; background: radial-gradient(circle at 20% -10%, rgba(122,43,217,.25), transparent 40%), radial-gradient(circle at 90% 20%, rgba(231,0,255,.25), transparent 40%), linear-gradient(135deg, #eef2ff 0%, #f7e7ff 60%, #fff6fb 100%);}
    .hero-grid{display:grid;grid-template-columns:1.05fr 0.95fr;gap:40px;align-items:center}
    .hero h1{font-size:42px;line-height:1.15;margin:0 0 12px;font-weight:800;background:linear-gradient(135deg, #1b0b32 0%, #6a1fb4 60%, #0a1a4a 100%); -webkit-background-clip:text;background-clip:text;color:transparent}
    .hero p{font-size:18px; color:#394150; margin:0 0 20px}
    .cta{display:flex;gap:14px;margin-top:6px}
    .btn{padding:12px 18px;border-radius:999px;border:1px solid #7a2bd9;background:var(--primary);color:white;font-weight:700;cursor:pointer;box-shadow:0 4px 14px rgba(122,43,217,.35);transition:transform .2s, box-shadow .2s}
    .btn.secondary{background:white;color:#1b1b1b;border:1px solid #d4d4d8}
    .btn:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(122,43,217,.42)}
    .hero-visual{position:relative;height:260px;border-radius:14px;background: linear-gradient(135deg, #ffffff 0%, #faf7ff 100%);box-shadow: var(--shadow);border:1px solid #eee}
    /* decorative shapes */
    .shape{position:absolute;border-radius:50%;opacity:.25}
    .shape.s1{width:180px;height:180px;background:#6a1fb4;right:8%;top: -40px}
    .shape.s2{width:260px;height:260px;background:#e53e9b;left: -60px;bottom:-60px}
    @media (max-width: 1024px){
      .hero-grid{grid-template-columns:1fr;gap:20px}
      .hero{padding:68px 0 40px}
      .hero h1{font-size:34px}
    }
    /* Sections styling */
    section{padding:60px 0}
    .section-title{font-size:28px;font-weight:800;margin:0 0 14px}
    .section-sub{color:var(--muted);margin:0 0 20px}
    .grid{display:grid;gap:20px}
    .grid-3{grid-template-columns:repeat(3,1fr)}
    @media (max-width: 900px){
      .grid-3{grid-template-columns:1fr}
    }
    .card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;border:1px solid #eef0f4}
    .card h3{margin:0 0 8px;font-size:18px}
    .card p{margin:0;color:var(--muted);font-size:14px}
    .stat{display:flex;gap:16px;flex-wrap:wrap}
    .stat .item{flex:1 1 180px;background:#fff;border-radius:12px;padding:14px;border:1px solid #eee;min-width:180px}
    .item .num{font-size:22px;font-weight:800}
    .item .lbl{color:var(--muted);font-size:12px}
    .timeline{position:relative;padding-left:20px}
    .timeline:before{content:'';position:absolute;left:6px;top:0;bottom:0;width:2px;background:#dfe4f5}
    .timeline-item{position:relative;padding:14px 0 14px 20px}
    .timeline-item:before{content:'';position:absolute;left:-14px;top:14px;width:10px;height:10px;background:var(--primary);border-radius:50%;border:2px solid #fff}
    table{width:100%;border-collapse:collapse}
    th,td{border:1px solid #e5e7eb;padding:10px 12px;text-align:left}
    th{background:#f5f7fb}
    .faq{max-width:900px;margin:0 auto}
    .faq-item{border:1px solid #e5e7eb;border-radius:8px;margin-bottom:10px;background:#fff}
    .faq-head{padding:12px 14px;cursor:pointer;font-weight:600;display:flex;justify-content:space-between;align-items:center}
    .faq-body{padding:0 14px 12px;display:none;color:#374151}
    .faq-open .faq-body{display:block}
    .reviews{display:grid;grid-template-columns: repeat(3,1fr);gap:16px}
    @media (max-width: 900px){
      .reviews{grid-template-columns:1fr}
    }
    .review{padding:14px;border-radius:10px;background:#fff;border:1px solid #e5e7eb;min-height:120px}
    .review .author{font-weight:700;margin-top:8px}
    .form{display:grid;gap:12px}
    .form-row{display:flex;gap:12px}
    .form-row > div{flex:1}
    input[type="text"],
    input[type="tel"],
    textarea,
    select{width:100%;padding:12px;border-radius:8px;border:1px solid #d6d6da;background:#fff;color:#111}
    textarea{min-height:120px;resize:vertical}
    .label{font-size:13px;color:var(--muted);margin-bottom:6px;display:block}
    .section-divider{height:1px;background:#e9eaf2;margin:40px 0}
    .footer{border-top:1px solid #e9e9ef;background:#fff;margin-top:20px}
    .footer-inner{padding:20px 0}
    .links{display:flex;flex-wrap:wrap;gap:12px}
    .tag{background:#f1f5ff;border:1px solid #dbe4ff;color:#21356f;padding:6px 10px;border-radius:999px;font-size:12px}
    /* Floating customer service */
    .float-service{position:fixed;right:20px;bottom:20px;z-index:999}
    .float-btn{width:54px;height:54px;border-radius:50%;background:var(--primary);color:white;border:none;cursor:pointer;box-shadow:0 8px 20px rgba(122,43,217,.5);display:flex;align-items:center;justify-content:center}
    .float-panel{position:absolute;bottom:70px;right:0;width:320px;background:white;border-radius:12px;box-shadow:0 14px 28px rgba(0,0,0,.15);padding:14px;border:1px solid #eee}
    .kefu-qr{width:110px;height:110px;object-fit:cover;border-radius:6px;border:1px solid #eee;margin-right:12px}
    .panel-row{display:flex;gap:12px;align-items:center}
    .hidden{display:none}
    @media (max-width: 640px){
      .header-inner{height:64px}
      .hero{padding-top:64px}
      .hero h1{font-size:28px}
      .hero-visual{height:180px}
      .float-panel{width:260px}
    }