:root{
      --bg:#f6f8fc;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#10203a;
      --muted:#5d6b84;
      --line:#dbe5f3;
      --primary:#1156d6;
      --primary2:#3a8dff;
      --accent:#0bb3ff;
      --warm:#f0f6ff;
      --shadow:0 18px 50px rgba(15,43,92,.10);
      --radius:22px;
      --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",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(17,86,214,.10), transparent 28%),
        radial-gradient(circle at right 16%, rgba(11,179,255,.09), transparent 22%),
        linear-gradient(180deg, #f9fbff 0%, #f4f8fd 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--container)); margin:0 auto}
    .topbar{
      position:sticky; top:0; z-index:20;
      backdrop-filter:saturate(180%) blur(14px);
      background:rgba(250,252,255,.82);
      border-bottom:1px solid rgba(219,229,243,.9);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:18px;
      min-height:76px;
    }
    .brand{display:flex; align-items:center; gap:12px; min-width:0}
    .brand .ai-page-logo{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:5px;box-shadow:0 6px 18px rgba(17,86,214,.08)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:18px;letter-spacing:.4px}
    .brand-text span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
    .menu{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
    .menu a{font-size:14px;color:var(--muted);padding:8px 10px;border-radius:999px;transition:.25s}
    .menu a:hover,.menu a.active{color:var(--primary);background:rgba(17,86,214,.08)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .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;font-size:14px;transition:.25s;cursor:pointer;white-space:nowrap
    }
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 12px 28px rgba(17,86,214,.22)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 34px rgba(17,86,214,.28)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:rgba(17,86,214,.35);color:var(--primary);transform:translateY(-1px)}
    .menu-toggle{display:none}
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.12fr .88fr;gap:22px;align-items:stretch
    }
    .hero-main,.hero-side,.section-card,.quote-card,.faq-item,.form-card,.price-card,.compare-card,.case-card,.article-card,.review-card,.timeline-card,.network-card,.support-card{
      background:linear-gradient(180deg, rgba(255,255,255,.98), rgba(248,251,255,.98));
      border:1px solid rgba(219,229,243,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-main{padding:34px; position:relative; overflow:hidden}
    .hero-main::before,.hero-main::after{
      content:"";position:absolute;border-radius:50%;pointer-events:none
    }
    .hero-main::before{width:240px;height:240px;right:-90px;top:-80px;background:radial-gradient(circle, rgba(58,141,255,.18), transparent 65%)}
    .hero-main::after{width:180px;height:180px;left:-70px;bottom:-70px;background:radial-gradient(circle, rgba(11,179,255,.13), transparent 68%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(17,86,214,.08);color:var(--primary);font-size:13px;font-weight:700}
    h1{margin:18px 0 14px;font-size:clamp(30px,4vw,52px);line-height:1.08;letter-spacing:-.02em}
    .hero-copy{font-size:16px;line-height:1.85;color:var(--muted);max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:24px}
    .mini-stat{
      padding:15px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#eef5ff);border:1px solid var(--line)
    }
    .mini-stat strong{display:block;font-size:20px;color:var(--primary)}
    .mini-stat span{display:block;margin-top:4px;color:var(--muted);font-size:13px;line-height:1.45}
    .hero-side{padding:24px;display:grid;gap:14px}
    .side-badge{
      padding:12px 14px;border-radius:16px;background:linear-gradient(135deg, rgba(17,86,214,.08), rgba(11,179,255,.08));
      border:1px solid rgba(17,86,214,.12)
    }
    .side-badge strong{display:block;font-size:15px;margin-bottom:4px}
    .side-badge span{color:var(--muted);font-size:13px;line-height:1.7}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#294166}
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:clamp(22px,2.6vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:62ch;line-height:1.8}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .card{padding:22px}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p{margin:0;color:var(--muted);line-height:1.78}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(17,86,214,.12), rgba(11,179,255,.10));color:var(--primary);margin-bottom:14px;font-weight:800
    }
    .service-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .service-item{padding:18px;border:1px solid var(--line);border-radius:18px;background:#fff}
    .service-item strong{display:block;margin-bottom:8px;font-size:16px}
    .service-item span{color:var(--muted);font-size:14px;line-height:1.75}
    .flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .flow-step{
      padding:22px;border-radius:20px;background:linear-gradient(180deg,#fff,#f7fbff);border:1px solid var(--line);position:relative
    }
    .flow-step .num{display:inline-flex;width:34px;height:34px;border-radius:50%;align-items:center;justify-content:center;background:var(--primary);color:#fff;font-weight:800;margin-bottom:14px}
    .table-wrap{overflow:auto;border-radius:20px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:820px}
    th,td{padding:15px 16px;border-bottom:1px solid #e6edf7;text-align:left;font-size:14px}
    th{background:#f5f9ff;color:#20334e;font-size:14px}
    td{color:#38506f}
    tr:last-child td{border-bottom:none}
    .rating{
      display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:14px
    }
    .stars{color:#f5a623;font-size:22px;letter-spacing:2px}
    .compare-card .score{
      display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:center
    }
    .score-box{padding:22px;border-radius:18px;background:linear-gradient(135deg,#0f5bd6,#1b7cff);color:#fff}
    .score-box strong{display:block;font-size:42px;line-height:1}
    .score-box span{display:block;margin-top:6px;opacity:.92}
    .score-list{display:grid;gap:10px}
    .score-list div{padding:12px 14px;border-radius:14px;background:#f7fbff;border:1px solid var(--line);display:flex;justify-content:space-between;gap:10px}
    .score-list b{color:#173255}
    .support-grid{display:grid;grid-template-columns:1fr .9fr;gap:16px;align-items:start}
    .support-card,.form-card{padding:24px}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:flex;gap:14px;align-items:flex-start;padding:14px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .timeline-item .dot{width:12px;height:12px;border-radius:50%;background:var(--primary);margin-top:6px;box-shadow:0 0 0 6px rgba(17,86,214,.10)}
    .reviews,.articles,.cases,.faq-list,.network-list{display:grid;gap:16px}
    .review-card,.article-card,.case-card,.faq-item,.network-card,.price-card{padding:20px}
    .review-card .meta{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .review-card .who{font-weight:700}
    .review-card .role,.article-card .date{color:var(--muted);font-size:13px}
    .article-card h3,.case-card h3{margin:10px 0 8px}
    .article-card .link{margin-top:12px;display:inline-flex;color:var(--primary);font-weight:700}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;border:0;background:transparent;padding:0;display:flex;justify-content:space-between;align-items:center;gap:16px;color:var(--text);font-size:16px;font-weight:700;cursor:pointer;text-align:left}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease; color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{max-height:180px;margin-top:10px}
    .faq-item.open .chev{transform:rotate(45deg)}
    .chev{transition:.25s;color:var(--primary);font-size:22px}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:grid;gap:8px}
    .field.full{grid-column:1/-1}
    label{font-size:14px;font-weight:700;color:#1e3554}
    input,select,textarea{
      width:100%;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:14px;
      padding:12px 14px;font:inherit;outline:none;transition:.2s
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(17,86,214,.55);box-shadow:0 0 0 4px rgba(17,86,214,.10)}
    textarea{min-height:120px;resize:vertical}
    .footer{
      margin-top:18px;padding:26px 0 30px;border-top:1px solid rgba(219,229,243,.9);
      background:linear-gradient(180deg, rgba(245,249,255,.85), rgba(240,245,252,.92));
      color:#20314c
    }
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px}
    .footer h3,.footer h4{margin:0 0 12px}
    .footer p,.footer a,.footer li{color:#38506f;line-height:1.85}
    .footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
    .footer .links{display:flex;flex-wrap:wrap;gap:10px}
    .footer .links a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line)}
    .footer-bottom{margin-top:18px;padding-top:16px;border-top:1px solid rgba(219,229,243,.9);display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:13px;color:#59708f}
    .float-tools{
      position:fixed;right:16px;bottom:16px;z-index:30;display:grid;gap:10px
    }
    .float-tools a,.float-tools button{
      width:46px;height:46px;border-radius:50%;border:1px solid rgba(219,229,243,.96);
      background:#fff;box-shadow:0 12px 28px rgba(15,43,92,.14);display:grid;place-items:center;color:var(--primary);cursor:pointer
    }
    .float-tools a:hover,.float-tools button:hover{transform:translateY(-2px)}
    .mobile-only{display:none}
    .scroll-reveal{opacity:0;transform:translateY(16px);transition:.55s ease}
    .scroll-reveal.show{opacity:1;transform:translateY(0)}
    .note{
      padding:14px 16px;border-radius:16px;background:rgba(17,86,214,.06);border:1px dashed rgba(17,86,214,.18);color:#365071;font-size:14px;line-height:1.8
    }
    .media-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .media-grid img,.square-grid img{width:100%;height:auto;border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .square-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .anchor-space{scroll-margin-top:92px}
    @media (max-width: 980px){
      .hero-grid,.grid-4,.grid-3,.grid-2,.flow,.support-grid,.footer-grid,.media-grid,.square-grid{grid-template-columns:1fr}
      .hero-points,.service-list,.form-grid{grid-template-columns:1fr}
      .compare-card .score{grid-template-columns:1fr}
      .menu{display:none}
      .menu-toggle{display:inline-flex}
      .menu.open{display:flex;position:absolute;left:16px;right:16px;top:76px;flex-direction:column;align-items:stretch;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
      .menu.open a{padding:12px 14px}
      .desktop-only{display:none}
      .mobile-only{display:inline-flex}
    }
    @media (max-width: 640px){
      .container{width:min(100% - 22px, var(--container))}
      .hero-main,.hero-side,.card,.support-card,.form-card,.price-card,.compare-card,.case-card,.article-card,.review-card,.timeline-card,.network-card,.faq-item{padding:18px}
      .nav{min-height:68px}
      h1{font-size:30px}
      .section-head{align-items:flex-start;flex-direction:column}
      .btn{padding:11px 15px}
      .float-tools{right:12px;bottom:12px}
    }