:root{
      --bg:#f6f8fc;
      --panel:#ffffff;
      --panel-2:#eef4ff;
      --text:#162033;
      --muted:#5d6b84;
      --brand:#1557ff;
      --brand-2:#00a3ff;
      --line:#dce5f5;
      --shadow:0 18px 40px rgba(21,87,255,.10);
      --shadow-2:0 12px 28px rgba(22,32,51,.08);
      --radius:18px;
      --radius-sm:12px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      background:
        radial-gradient(circle at top left, rgba(21,87,255,.10), transparent 30%),
        radial-gradient(circle at 85% 10%, rgba(0,163,255,.12), transparent 25%),
        linear-gradient(180deg,#f8fbff 0%,#f6f8fc 48%,#f7f9fd 100%);
      color:var(--text);
      line-height:1.7;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .topbar, header, main, footer{width:100%}
    .topbar{
      position:sticky;top:0;z-index:40;
      backdrop-filter:saturate(150%) blur(14px);
      background:rgba(246,248,252,.86);
      border-bottom:1px solid rgba(220,229,245,.8);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:16px;
      min-height:74px;
    }
    .brand{
      display:flex;align-items:center;gap:12px;min-width:0;
    }
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:10px;background:#fff;box-shadow:var(--shadow-2)}
    .brand h2{margin:0;font-size:18px;line-height:1.15}
    .brand p{margin:2px 0 0;color:var(--muted);font-size:12px}
    .nav-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
    .nav-links a,.menu-btn{
      padding:10px 12px;border-radius:999px;font-size:14px;color:var(--text);
      transition:.2s ease;background:transparent;border:1px solid transparent;
    }
    .nav-links a:hover,.menu-btn:hover{background:#eef4ff;border-color:#d7e4ff}
    .menu-btn{display:none;cursor:pointer}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:12px 18px;border-radius:999px;border:1px solid transparent;
      font-weight:700;transition:.22s ease;cursor:pointer;white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 14px 30px rgba(21,87,255,.22)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 36px rgba(21,87,255,.28)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:#bcd0ff;transform:translateY(-1px)}
    .hero{
      padding:54px 0 24px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch;
    }
    .hero-copy,.hero-side,.card,.section,.faq-item,.review,.article,.form-box,.compare,.timeline li,.pricebox{
      background:rgba(255,255,255,.92);
      border:1px solid rgba(220,229,245,.95);
      box-shadow:var(--shadow-2);
      border-radius:var(--radius);
    }
    .hero-copy{padding:30px}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;background:#eef4ff;color:#1557ff;font-size:13px;font-weight:700;
    }
    h1{
      margin:16px 0 14px;font-size:clamp(30px,4vw,52px);line-height:1.1;letter-spacing:-.02em;
    }
    .lead{margin:0;color:var(--muted);font-size:16px;max-width:60ch}
    .hero-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:22px 0 20px}
    .mini-stat{
      padding:14px 14px 13px;border-radius:16px;background:linear-gradient(180deg,#f8fbff,#eef4ff);
      border:1px solid #dbe7ff;
    }
    .mini-stat strong{display:block;font-size:18px}
    .mini-stat span{font-size:13px;color:var(--muted)}
    .hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
    .hero-side{padding:22px;display:flex;flex-direction:column;gap:14px}
    .side-chip{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:8px 10px;border-radius:999px;background:#f1f6ff;border:1px solid #d9e6ff;color:#22406e;font-size:13px}
    .side-box{
      padding:16px;border-radius:16px;background:linear-gradient(135deg,#0f4cff,#19a3ff);color:#fff;
    }
    .side-box p,.side-box strong{margin:0}
    .side-list{display:grid;gap:10px}
    .side-list div{
      padding:12px 14px;border-radius:14px;background:#f8fbff;border:1px solid #dbe7ff
    }
    .side-list b{display:block;margin-bottom:2px}
    .section{padding:26px;margin-top:20px}
    .section h2{margin:0 0 10px;font-size:28px;line-height:1.2}
    .section p.section-desc{margin:0 0 18px;color:var(--muted)}
    .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{padding:18px}
    .card h3{margin:0 0 8px;font-size:18px}
    .card p{margin:0;color:var(--muted)}
    .metric{font-size:30px;font-weight:800;color:var(--brand);line-height:1}
    .metric small{font-size:14px;color:var(--muted);font-weight:600}
    .table-wrap{overflow:auto;border-radius:16px;border:1px solid var(--line)}
    table{width:100%;border-collapse:collapse;min-width:820px;background:#fff}
    th,td{padding:14px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f4f8ff;font-size:14px}
    tr:hover td{background:#fbfdff}
    .badge{display:inline-flex;align-items:center;padding:5px 10px;border-radius:999px;background:#edf4ff;color:#1557ff;font-size:12px;font-weight:700}
    .two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .timeline{list-style:none;padding:0;margin:0;display:grid;gap:12px}
    .timeline li{padding:16px 18px}
    .timeline .step{font-weight:800;color:var(--brand)}
    .review-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review{padding:18px}
    .review .who{display:flex;justify-content:space-between;gap:12px;margin-bottom:10px}
    .stars{color:#ffb400;letter-spacing:2px;font-size:15px}
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%;padding:16px 18px;background:transparent;border:0;cursor:pointer;
      display:flex;justify-content:space-between;align-items:center;color:var(--text);font-size:16px;font-weight:700;text-align:left;
    }
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 18px;color:var(--muted)}
    .faq-item.active .faq-a{max-height:180px;padding-bottom:16px}
    .faq-item.active .faq-q .icon{transform:rotate(45deg)}
    .icon{transition:.2s ease;font-size:20px;color:var(--brand)}
    .articles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .article{padding:18px}
    .article time{color:var(--muted);font-size:13px}
    .article h3{margin:8px 0 8px}
    .article a{color:var(--brand);font-weight:700}
    .form-box{padding:20px}
    form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    label{display:grid;gap:7px;font-size:14px;font-weight:700}
    input,select,textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;padding:12px 14px;
      color:var(--text);font:inherit;outline:none;transition:.2s ease;
    }
    textarea{min-height:120px;resize:vertical;grid-column:1/-1}
    input:focus,select:focus,textarea:focus{border-color:#9bb8ff;box-shadow:0 0 0 4px rgba(21,87,255,.10)}
    .form-actions{grid-column:1/-1;display:flex;gap:12px;flex-wrap:wrap;align-items:center}
    .contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
    .qrcode{
      display:flex;gap:16px;align-items:center;flex-wrap:wrap
    }
    .qrcode img{width:156px;height:156px;object-fit:cover;border-radius:16px;border:1px solid var(--line);background:#fff}
    .footer{
      margin-top:20px;padding:26px 0 24px;background:#0d1a33;color:#dbe7ff;border-top:1px solid rgba(255,255,255,.08)
    }
    .footer a{color:#fff}
    .footer .container{display:grid;gap:16px}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:16px}
    .footer-card{padding:0}
    .footer h3{margin:0 0 10px;color:#fff}
    .footer p,.footer li{color:#dbe7ff}
    .footer ul{padding-left:18px;margin:0;display:grid;gap:6px}
    .float-tools{
      position:fixed;right:16px;bottom:16px;z-index:50;display:grid;gap:10px
    }
    .float-tools a,.float-tools button{
      width:48px;height:48px;border-radius:50%;border:0;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 14px 28px rgba(21,87,255,.26);cursor:pointer
    }
    .backtop{opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s ease}
    .backtop.show{opacity:1;pointer-events:auto;transform:none}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:8px 12px;border-radius:999px;background:#f2f6ff;border:1px solid #dbe7ff;color:#29456f;font-size:13px}
    .service-network{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .network-item{padding:14px 16px;border-radius:16px;background:#f7fbff;border:1px solid #dce7ff}
    .compare-head{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
    .rating{font-size:22px;font-weight:900;color:#1557ff}
    .sticky-note{
      padding:14px 16px;border-radius:16px;background:linear-gradient(135deg,#f3f7ff,#eaf2ff);border:1px solid #dbe7ff
    }
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.contact-grid,.footer-grid,.two-col,.grid-3,.grid-4,.review-grid,.articles,.service-network{grid-template-columns:1fr}
      .menu-btn{display:inline-flex}
      .nav-links{
        display:none;position:absolute;left:16px;right:16px;top:76px;padding:12px;background:#fff;border:1px solid var(--line);
        border-radius:18px;box-shadow:var(--shadow);z-index:60
      }
      .nav-links.open{display:flex;flex-direction:column;align-items:stretch}
      .nav-links a{padding:12px 14px}
      form{grid-template-columns:1fr}
      .mobile-only{display:inline-flex}
      .hero{padding-top:28px}
    }
    @media (max-width: 640px){
      .container{width:min(var(--container),calc(100% - 22px))}
      .hero-copy,.hero-side,.section,.form-box,.card,.review,.article{padding:18px}
      h1{font-size:clamp(28px,8vw,38px)}
      .hero-points{grid-template-columns:1fr}
      .nav{min-height:68px}
      .brand h2{font-size:16px}
    }
    .reveal{opacity:0;transform:translateY(14px);transition:.55s ease}
    .reveal.in{opacity:1;transform:none}