:root{
      --bg:#f6f8fb;
      --panel:#ffffff;
      --panel-2:#f0f4ff;
      --line:#dbe3f0;
      --text:#132036;
      --muted:#5f6b84;
      --brand:#3b82f6;
      --brand2:#8b5cf6;
      --accent:#06b6d4;
      --warm:#ffb703;
      --shadow:0 18px 50px rgba(23, 39, 73, .09);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
      background:
        radial-gradient(circle at top left, rgba(59,130,246,.12), transparent 26%),
        radial-gradient(circle at 85% 12%, rgba(139,92,246,.12), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f6f8fb 44%, #f4f7fb 100%);
      color:var(--text);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%;height:auto}
    .container{max-width:var(--container);margin:0 auto;padding:0 20px}
    header{
      position:sticky;top:0;z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(246,248,251,.84);
      border-bottom:1px solid rgba(219,227,240,.8);
    }
    .topbar{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:10px;background:#fff;border:1px solid var(--line);padding:4px;box-shadow:0 6px 18px rgba(59,130,246,.08)}
    .brand strong{display:block;font-size:16px;line-height:1.1}
    .brand span{display:block;font-size:12px;color:var(--muted);margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:260px}
    .nav-wrap{display:flex;align-items:center;gap:14px}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px}
    nav{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
    nav a{font-size:13px;color:#33415c;padding:8px 10px;border-radius:999px;transition:.2s ease}
    nav a:hover{background:rgba(59,130,246,.08);color:#1e3a8a}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:0;border-radius:14px;padding:12px 18px;font-weight:700;cursor:pointer;
      transition:transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
    }
    .btn:hover{transform:translateY(-2px)}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 14px 28px rgba(59,130,246,.22)}
    .btn-ghost{background:#fff;color:var(--text);border:1px solid var(--line)}
    main{padding:26px 0 0}
    section{padding:26px 0}
    .hero{
      padding:18px 0 30px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:stretch;
    }
    .hero-card,.side-card,.panel,.faq-item,.review,.case,.article,.form-card,.stat,.service,.timeline-item,.compare-card{
      background:rgba(255,255,255,.9);
      border:1px solid rgba(219,227,240,.92);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-card{padding:32px;position:relative;overflow:hidden}
    .hero-card:before,.hero-card:after{
      content:"";position:absolute;border-radius:50%;filter:blur(0);
      pointer-events:none;
    }
    .hero-card:before{width:260px;height:260px;right:-120px;top:-90px;background:radial-gradient(circle, rgba(59,130,246,.16), transparent 68%)}
    .hero-card:after{width:220px;height:220px;right:80px;bottom:-120px;background:radial-gradient(circle, rgba(139,92,246,.14), transparent 68%)}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      background:linear-gradient(135deg, rgba(59,130,246,.12), rgba(139,92,246,.12));
      color:#27406e;border:1px solid rgba(59,130,246,.18);
      padding:8px 12px;border-radius:999px;font-size:13px;font-weight:700;
    }
    h1{font-size:clamp(30px,4.2vw,52px);line-height:1.08;margin:16px 0 14px}
    h2{font-size:clamp(24px,2.6vw,34px);line-height:1.15;margin:0 0 10px}
    h3{font-size:18px;margin:0 0 8px}
    p{line-height:1.8;color:var(--muted);margin:0}
    .hero p{max-width:68ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 16px}
    .mini-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
    .tag{padding:8px 12px;border-radius:999px;background:#f3f6ff;border:1px solid #e2e9f5;color:#284169;font-size:13px}
    .hero-side{display:grid;gap:16px}
    .side-card{padding:22px}
    .metric-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:18px}
    .stat{padding:18px}
    .stat strong{display:block;font-size:28px;color:#1d355f}
    .stat span{display:block;margin-top:6px;font-size:13px;color:var(--muted)}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service,.case,.article,.review,.faq-item,.panel,.form-card,.compare-card,.timeline-item{padding:20px}
    .service .icon,.feature-badge{
      width:42px;height:42px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(59,130,246,.12), rgba(6,182,212,.12));
      color:#2857a6;font-weight:800;margin-bottom:14px;
    }
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}
    .section-head p{max-width:72ch}
    .pill-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .table-wrap{overflow:auto;border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:15px 14px;border-bottom:1px solid #e9eff7;text-align:left;vertical-align:top}
    th{background:#f6f9ff;color:#1f345d;font-size:14px}
    td{color:#34435d;font-size:14px}
    .strong{font-weight:800;color:#16315f}
    .rating{display:flex;align-items:center;gap:8px;font-weight:800;color:#15305c}
    .stars{color:#f59e0b;letter-spacing:2px}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{
      position:relative;padding:20px;border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)
    }
    .step .num{font-size:12px;font-weight:800;color:#4b74c1;text-transform:uppercase;letter-spacing:.08em}
    .compare-grid,.about-grid,.network-grid,.contact-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:16px}
    .compare-card ul,.service ul,.panel ul,.case ul,.article ul{margin:12px 0 0;padding:0 0 0 18px;color:var(--muted);line-height:1.8}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:grid;grid-template-columns:100px 1fr;gap:14px;align-items:start}
    .timeline-item time{font-weight:800;color:#31518a}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review .meta{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .avatar{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#dceaff,#edf2ff);color:#27406e;font-weight:800}
    .articles{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .article a{color:#1d4ed8;font-weight:700}
    .faq{display:grid;gap:12px}
    .faq-item summary{cursor:pointer;list-style:none;font-weight:700;color:#1d3356}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item p{padding-top:12px}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:block;font-size:13px;color:#33415c;font-weight:700;margin-bottom:8px}
    input,select,textarea{
      width:100%;border:1px solid #d8e2f0;border-radius:14px;background:#fff;color:var(--text);
      padding:13px 14px;font:inherit;outline:none;transition:border .2s ease, box-shadow .2s ease;
    }
    textarea{min-height:130px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#86aef9;box-shadow:0 0 0 4px rgba(59,130,246,.10)}
    .span-2{grid-column:span 2}
    .footer-wrap{
      margin-top:8px;
      background:linear-gradient(180deg,#eef4ff 0%, #f5f8fd 100%);
      border-top:1px solid #dbe3f0;
      color:#193055;
    }
    footer{padding:24px 0}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:16px}
    .footer-grid a{color:#244f9e}
    .footer-note{margin-top:14px;font-size:13px;color:#66758f}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .floating a,.floating button{
      width:48px;height:48px;border-radius:16px;border:1px solid rgba(219,227,240,.95);
      background:#fff;box-shadow:var(--shadow);display:grid;place-items:center;color:#1f3e73;cursor:pointer
    }
    .customer-float{
      position:fixed;left:18px;bottom:18px;z-index:60;max-width:280px;
      background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px;padding:14px;
    }
    .customer-float strong{display:block;margin-bottom:6px}
    .customer-float small{display:block;color:var(--muted);line-height:1.6}
    .mobile-only{display:none}
    .fade-in{opacity:0;transform:translateY(14px);transition:.65s ease}
    .fade-in.in{opacity:1;transform:none}
    .home-link{display:inline-flex;align-items:center;padding:8px 10px;border-radius:12px;background:#eef4ff;border:1px solid #dce6fb;color:#21407a;font-size:13px}
    .logo-line{display:flex;align-items:center;gap:12px;margin-top:16px}
    .qc-box{display:grid;grid-template-columns:130px 1fr;gap:14px;align-items:center}
    .price-list{display:grid;gap:10px;margin-top:12px}
    .price-row{display:flex;justify-content:space-between;gap:12px;padding:12px 14px;background:#f7faff;border:1px solid #e2eaf7;border-radius:14px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:8px 11px;border-radius:999px;background:#fff;border:1px solid #dce6f4;color:#35507b;font-size:13px}
    @media (max-width: 1024px){
      .hero-grid,.compare-grid,.about-grid,.network-grid,.contact-grid,.footer-grid{grid-template-columns:1fr}
      .grid-4,.grid-3,.reviews,.steps,.articles{grid-template-columns:repeat(2,1fr)}
      .metric-grid{grid-template-columns:repeat(3,1fr)}
    }
    @media (max-width: 720px){
      .topbar{flex-wrap:wrap}
      .nav-toggle{display:inline-flex}
      nav{display:none;width:100%;padding:10px 0 4px}
      nav.open{display:flex;flex-direction:column;align-items:flex-start}
      nav a{padding:10px 0}
      .desktop-btn{display:none}
      .mobile-only{display:inline-flex}
      .hero-card{padding:24px}
      .metric-grid,.grid-4,.grid-3,.reviews,.steps,.articles,.form-grid{grid-template-columns:1fr}
      .span-2{grid-column:auto}
      .timeline-item{grid-template-columns:1fr}
      .qc-box{grid-template-columns:1fr}
      .customer-float{left:12px;right:12px;bottom:82px;max-width:none}
      .floating{right:12px;bottom:12px}
    }