:root{
      --bg:#f6f9ff;
      --panel:#ffffff;
      --panel-2:#f1f7ff;
      --line:#dbe6f5;
      --text:#182235;
      --muted:#52607a;
      --brand:#2563eb;
      --brand-2:#06b6d4;
      --accent:#7c3aed;
      --shadow:0 18px 50px rgba(31,64,124,.10);
      --radius:22px;
      --radius-sm:16px;
      --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;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(37,99,235,.12), transparent 28%),
        radial-gradient(circle at right 18%, rgba(6,182,212,.12), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f5f9ff 100%);
      line-height:1.65;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .site-header{
      position:sticky; top:0; z-index:50;
      backdrop-filter: blur(16px);
      background: rgba(248,251,255,.82);
      border-bottom:1px solid rgba(219,230,245,.8);
    }
    .nav-wrap{display:flex; align-items:center; justify-content:space-between; gap:16px; min-height:76px}
    .brand{display:flex; align-items:center; gap:12px; min-width:0}
    .brand .ai-page-logo{width:42px; height:42px; object-fit:contain}
    .brand-text{display:flex; flex-direction:column; min-width:0}
    .brand-text strong{font-size:16px; letter-spacing:.3px}
    .brand-text span{font-size:12px; color:var(--muted)}
    .nav-toggle{
      display:none; border:1px solid var(--line); background:#fff; color:var(--text);
      border-radius:12px; padding:10px 12px; box-shadow:0 8px 20px rgba(37,99,235,.08)
    }
    .nav{
      display:flex; align-items:center; gap:8px; flex-wrap:wrap; justify-content:flex-end
    }
    .nav a{
      padding:9px 12px; border-radius:999px; color:var(--muted); font-size:14px;
      transition:.2s ease; border:1px solid transparent
    }
    .nav a:hover,.nav a:focus{color:var(--brand); background:#eef5ff; border-color:#d9e6ff}
    .nav .home-link{color:#fff; background:linear-gradient(135deg,var(--brand),var(--brand-2)); box-shadow:0 12px 22px rgba(37,99,235,.18)}
    .nav .home-link:hover{transform:translateY(-1px)}
    .hero{
      padding:48px 0 24px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.15fr .85fr; gap:22px; align-items:stretch
    }
    .hero-card,.panel,.info-card,.review-card,.case-card,.service-card,.step-card,.metric-card,.faq-item,.article-card,.price-card{
      background:rgba(255,255,255,.9);
      border:1px solid rgba(219,230,245,.95);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-card{
      padding:34px;
      position:relative;
      overflow:hidden;
      background:
        linear-gradient(135deg, rgba(37,99,235,.08), rgba(124,58,237,.06)),
        rgba(255,255,255,.96);
    }
    .hero-card::before{
      content:"";
      position:absolute; inset:auto -80px -90px auto;
      width:240px; height:240px; border-radius:50%;
      background:radial-gradient(circle, rgba(6,182,212,.28), transparent 66%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 12px; border-radius:999px;
      background:#eaf2ff; color:var(--brand); font-weight:700; font-size:13px;
      border:1px solid #d6e4ff
    }
    h1{margin:16px 0 12px; font-size:clamp(30px, 4vw, 54px); line-height:1.08}
    .lead{font-size:16px; color:var(--muted); max-width:58ch}
    .hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin:24px 0 18px}
    .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:.22s ease; cursor:pointer
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),#0ea5e9); color:#fff; box-shadow:0 14px 26px rgba(37,99,235,.22)}
    .btn-secondary{background:#fff; color:var(--text); border-color:var(--line)}
    .btn:hover{transform:translateY(-2px)}
    .hero-badges{display:flex; flex-wrap:wrap; gap:10px}
    .badge{padding:8px 12px; border-radius:999px; background:#f2f7ff; color:#334155; border:1px solid #dce7f7; font-size:13px}
    .hero-side{
      display:grid; gap:14px;
    }
    .metric-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    .metric-card{padding:20px}
    .metric-card strong{display:block; font-size:28px; line-height:1}
    .metric-card span{font-size:13px; color:var(--muted)}
    .hero-note{padding:20px; border-radius:var(--radius); background:linear-gradient(135deg, #f3f8ff, #ffffff); border:1px solid var(--line)}
    .hero-note h3{margin:0 0 8px; font-size:18px}
    .hero-note p{margin:0; color:var(--muted)}
    section{padding:18px 0}
    .section-head{display:flex; justify-content:space-between; align-items:end; gap:14px; margin-bottom:16px}
    .section-head h2{margin:0; font-size:28px}
    .section-head p{margin:0; 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}
    .panel,.service-card,.case-card,.review-card,.article-card,.price-card,.faq-item,.step-card{padding:22px}
    .service-card h3,.case-card h3,.review-card h3,.article-card h3,.price-card h3,.step-card h3{margin:0 0 10px; font-size:18px}
    .muted{color:var(--muted)}
    .pill-row,.tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .pill{padding:8px 12px; border-radius:999px; background:#f7fbff; border:1px solid var(--line); font-size:13px}
    .timeline{display:grid; gap:12px}
    .timeline-item{display:flex; gap:14px; align-items:flex-start; padding:14px 0; border-bottom:1px dashed #e3ecfa}
    .timeline-item:last-child{border-bottom:0}
    .timeline-num{
      width:34px; height:34px; border-radius:50%; flex:0 0 34px;
      background:linear-gradient(135deg,var(--brand),var(--brand-2)); color:#fff; display:grid; place-items:center; font-weight:800
    }
    .table-wrap{overflow:auto; border-radius:18px; border:1px solid var(--line); background:#fff}
    table{width:100%; border-collapse:collapse; min-width:760px}
    th,td{padding:14px 16px; border-bottom:1px solid #edf2fb; text-align:left; vertical-align:top}
    th{background:#f7fbff; font-size:14px}
    .stars{color:#f59e0b; font-size:18px}
    .compare-card{display:grid; gap:14px}
    .compare-score{display:flex; gap:14px; flex-wrap:wrap; align-items:center}
    .score-badge{
      width:96px; height:96px; border-radius:24px; background:linear-gradient(135deg,var(--brand),var(--accent));
      color:#fff; display:grid; place-items:center; font-size:28px; font-weight:800; box-shadow:0 20px 30px rgba(37,99,235,.2)
    }
    .form-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    .field{display:grid; gap:8px}
    .field label{font-size:14px; font-weight:700}
    .field input,.field select,.field textarea{
      width:100%; border:1px solid #d8e3f3; background:#fff; color:var(--text);
      border-radius:14px; padding:13px 14px; outline:none; font:inherit
    }
    .field textarea{min-height:120px; resize:vertical}
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#8cb3ff; box-shadow:0 0 0 4px rgba(37,99,235,.08)}
    .form-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:16px}
    .accordion{display:grid; gap:12px}
    details.faq-item summary{cursor:pointer; list-style:none; font-weight:700; display:flex; justify-content:space-between; gap:12px}
    details.faq-item summary::-webkit-details-marker{display:none}
    details.faq-item[open]{border-color:#b9cff6}
    .footer{
      margin-top:18px;
      padding:24px 0 28px;
      background:linear-gradient(180deg,#eef5ff 0%, #eaf2ff 100%);
      border-top:1px solid #d7e2f3
    }
    .footer-grid{display:grid; grid-template-columns:1.15fr .85fr; gap:18px}
    .footer a{color:#1d4ed8}
    .mini-links{display:flex; flex-wrap:wrap; gap:10px}
    .small{font-size:13px}
    .floating{
      position:fixed; right:16px; bottom:16px; z-index:60;
      display:grid; gap:10px
    }
    .float-btn{
      width:52px; height:52px; border-radius:16px; border:1px solid rgba(219,230,245,.95);
      background:#fff; box-shadow:0 16px 30px rgba(31,64,124,.14);
      display:grid; place-items:center; color:var(--brand); font-weight:800
    }
    .float-contact{
      width:52px; height:52px; border-radius:16px; overflow:hidden; border:1px solid rgba(219,230,245,.95); background:#fff; box-shadow:0 16px 30px rgba(31,64,124,.14)
    }
    .float-contact img{width:100%; height:100%; object-fit:cover}
    .mobile-panel{display:none}
    .two-col{display:grid; grid-template-columns:1fr 1fr; gap:16px}
    .content-list{display:grid; gap:12px}
    .content-list li{list-style:none; padding-left:18px; position:relative; color:var(--muted)}
    .content-list li::before{content:""; position:absolute; left:0; top:.65em; width:8px; height:8px; border-radius:50%; background:linear-gradient(135deg,var(--brand),var(--brand-2))}
    .case-card .mini-meta,.article-card .mini-meta{font-size:13px; color:var(--muted); margin-bottom:8px}
    .comment-meta{display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:10px}
    .quote{font-size:15px; color:#334155}
    .section-divider{height:1px; background:linear-gradient(90deg, transparent, #d8e5f7 20%, #d8e5f7 80%, transparent); margin:4px 0 10px}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-4,.footer-grid,.two-col{grid-template-columns:1fr}
      .section-head{align-items:flex-start; flex-direction:column}
      .nav-toggle{display:inline-flex}
      .nav{
        display:none; width:100%; padding:12px 0 16px; flex-direction:column; align-items:stretch
      }
      .nav.open{display:flex}
      .nav a{text-align:center; background:#fff}
      .nav-wrap{flex-wrap:wrap}
      .mobile-panel{display:block}
      .hero-card{padding:26px}
      .form-grid{grid-template-columns:1fr}
      .metric-grid{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 640px){
      .container{width:min(var(--container), calc(100% - 20px))}
      .hero{padding-top:22px}
      h1{font-size:30px}
      .hero-actions,.form-actions,.hero-badges{flex-direction:column; align-items:stretch}
      .btn{width:100%}
      .metric-grid{grid-template-columns:1fr}
      .section-head h2{font-size:24px}
      .panel,.service-card,.case-card,.review-card,.article-card,.price-card,.faq-item,.step-card,.hero-card{padding:18px}
    }
    [data-reveal]{opacity:0; transform:translateY(14px); transition:.6s ease}
    [data-reveal].in{opacity:1; transform:none}