:root{
      --bg:#f5f8fb;
      --bg2:#edf7fb;
      --card:#ffffff;
      --line:#dce7ef;
      --text:#183041;
      --muted:#577082;
      --primary:#118ab2;
      --primary2:#11b5b3;
      --primary3:#0f6f8a;
      --shadow:0 18px 40px rgba(18, 66, 90, .08);
      --radius:20px;
      --radius2:28px;
      --max:1200px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,var(--bg2),#fff 22%,var(--bg) 100%);color:var(--text)}
    img{display:block;max-width:100%}
    a{color:var(--primary3);text-decoration:none}
    .container{width:min(100% - 32px,var(--max));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:1000;background:rgba(245,248,251,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,231,239,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;box-shadow:0 10px 24px rgba(17,138,178,.12)}
    .brand-title{font-weight:800;letter-spacing:.4px}
    .brand-sub{font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:flex-end}
    .nav-links a,.nav-links button{border:1px solid var(--line);background:#fff;color:var(--text);padding:10px 12px;border-radius:999px;font-size:14px;line-height:1;transition:.25s ease;cursor:pointer}
    .nav-links a:hover,.nav-links button:hover{transform:translateY(-1px);border-color:rgba(17,138,178,.35);box-shadow:0 10px 20px rgba(17,138,178,.08)}
    .menu-btn{display:none}
    .hero{padding:36px 0 26px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch}
    .hero-panel{background:linear-gradient(135deg,#fff 0%,#f4fbfd 48%,#eaf8fb 100%);border:1px solid rgba(17,138,178,.12);border-radius:var(--radius2);box-shadow:var(--shadow);padding:28px;position:relative;overflow:hidden}
    .hero-panel:before{content:"";position:absolute;inset:auto -120px -120px auto;width:280px;height:280px;background:radial-gradient(circle,rgba(17,181,179,.18),transparent 68%);pointer-events:none}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(17,138,178,.08);color:var(--primary3);font-size:13px;font-weight:700}
    h1{margin:16px 0 12px;font-size:clamp(32px,4vw,54px);line-height:1.08;letter-spacing:-.5px}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:14px;border:1px solid transparent;font-weight:700;transition:.25s ease}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 14px 30px rgba(17,138,178,.2)}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--line)}
    .btn:hover{transform:translateY(-2px)}
    .hero-side{display:grid;gap:16px}
    .stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .stat{background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 10px 26px rgba(14,53,77,.05)}
    .stat strong{display:block;font-size:28px;color:var(--primary3)}
    .stat span{display:block;margin-top:6px;color:var(--muted);font-size:13px;line-height:1.5}
    .quick-card{background:linear-gradient(180deg,#ffffff 0%,#f7fcfd 100%);border:1px solid rgba(17,138,178,.12);border-radius:18px;padding:18px}
    .quick-card h2,.section-title{margin:0 0 10px;font-size:24px}
    .section{padding:18px 0 8px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head p{margin:0;color:var(--muted);line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:0 12px 26px rgba(18,66,90,.05);transition:.25s ease}
    .card:hover{transform:translateY(-3px);box-shadow:0 16px 32px rgba(18,66,90,.09)}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .chips{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:9px 12px;border-radius:999px;background:#eef8fb;border:1px solid rgba(17,138,178,.14);color:var(--primary3);font-size:13px}
    .timeline{display:grid;gap:14px}
    .step{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;padding:18px;border-radius:20px;background:#fff;border:1px solid var(--line)}
    .step .num{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:800}
    .table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:20px;background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2f6;text-align:left;vertical-align:top}
    th{background:#f3fafc;color:#16384b;font-size:14px}
    td{color:var(--muted)}
    details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px}
    details+details{margin-top:12px}
    summary{cursor:pointer;font-weight:700;color:var(--text)}
    summary::-webkit-details-marker{display:none}
    .faq p{margin:10px 0 0;color:var(--muted);line-height:1.75}
    .comments .card{display:flex;flex-direction:column;gap:10px}
    .avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#dff5fb,#cfeef0);display:grid;place-items:center;font-weight:800;color:var(--primary3)}
    .comment-top{display:flex;align-items:center;gap:12px}
    .rating{color:#d58b00;font-weight:800}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700}
    input,select,textarea{width:100%;padding:13px 14px;border-radius:14px;border:1px solid #d8e4ec;background:#fff;color:var(--text);font:inherit;outline:none}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:rgba(17,138,178,.5);box-shadow:0 0 0 4px rgba(17,138,178,.08)}
    .full{grid-column:1/-1}
    .footer{margin-top:18px;padding:24px 0 26px;background:#f2f7fa;border-top:1px solid var(--line);color:var(--text)}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:start}
    .footer small,.footer p,.footer li{color:#4d6475;line-height:1.75}
    .footer a{color:var(--primary3)}
    .float-actions{position:fixed;right:14px;bottom:14px;z-index:1001;display:grid;gap:10px}
    .float-actions a,.float-actions button{width:48px;height:48px;border-radius:16px;border:none;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 14px 30px rgba(17,138,178,.22);cursor:pointer}
    .fade-in{opacity:0;transform:translateY(16px);transition:.7s ease}
    .fade-in.show{opacity:1;transform:none}
    .mini-note{font-size:13px;color:var(--muted)}
    .image-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .image-row img{border-radius:18px;border:1px solid var(--line);box-shadow:0 12px 24px rgba(18,66,90,.06)}
    .scroll-top{position:fixed;right:14px;bottom:72px;z-index:1001;display:none}
    .scroll-top.show{display:grid}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-4,.footer-grid,.image-row{grid-template-columns:1fr}
      .section-head{align-items:start;flex-direction:column}
      .nav-links{display:none}
      .nav-links.open{display:flex;position:absolute;left:16px;right:16px;top:68px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
      .menu-btn{display:inline-flex}
      .form-grid{grid-template-columns:1fr}
    }