:root{
      --bg:#f5f8ff;
      --panel:#ffffff;
      --panel-2:#f2f7ff;
      --line:#dbe6ff;
      --text:#10203a;
      --muted:#5c6d86;
      --brand:#0a5bd8;
      --brand-2:#1d7bff;
      --brand-3:#0d2d72;
      --accent:#ffb53e;
      --shadow:0 14px 40px rgba(16,32,58,.10);
      --radius:20px;
      --radius-sm:14px;
      --max: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;background:
      radial-gradient(circle at top left, rgba(29,123,255,.12), transparent 28%),
      radial-gradient(circle at 85% 12%, rgba(255,181,62,.14), transparent 22%),
      linear-gradient(180deg,#f8fbff 0%, #f5f8ff 100%);
      color:var(--text);line-height:1.65}
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    header{position:sticky;top:0;z-index:30;background:rgba(248,251,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid rgba(219,230,255,.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;border-radius:12px;object-fit:cover;background:#fff;box-shadow:0 6px 18px rgba(10,91,216,.18)}
    .brand h2{margin:0;font-size:18px;line-height:1.1}
    .brand p{margin:2px 0 0;color:var(--muted);font-size:12px}
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a,.nav-links button{font:inherit}
    .nav-links a{color:var(--text);font-size:14px;padding:8px 10px;border-radius:10px}
    .nav-links a:hover{background:var(--panel-2);color:var(--brand)}
    .cta{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-2) 100%);color:#fff !important;padding:10px 14px;border-radius:12px;box-shadow:0 10px 22px rgba(10,91,216,.22)}
    .menu-btn{display:none;border:1px solid var(--line);background:#fff;color:var(--text);padding:10px 12px;border-radius:12px}
    main{padding:24px 0 0}
    section{padding:22px 0}
    .hero{padding-top:18px}
    .hero-grid{display:grid;grid-template-columns:1.3fr .9fr;gap:20px;align-items:stretch}
    .hero-card,.soft-card,.feature-card,.review-card,.faq-card,.case-card,.pricing-card,.article-card,.timeline-card,.form-card,.compare-card,.network-card{background:var(--panel);border:1px solid rgba(219,230,255,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-card{padding:28px;position:relative;overflow:hidden}
    .hero-card:before{content:"";position:absolute;inset:auto -60px -80px auto;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle, rgba(29,123,255,.18), transparent 65%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#ecf4ff;color:var(--brand);font-size:13px;font-weight:700}
    h1{margin:16px 0 12px;font-size:clamp(30px,5vw,52px);line-height:1.08;letter-spacing:-.02em}
    .lead{margin:0;color:var(--muted);font-size:16px;max-width:58ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 18px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 16px;border-radius:14px;border:1px solid transparent;font-weight:700;cursor:pointer;transition:.25s ease;min-height:46px}
    .btn-primary{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-2) 100%);color:#fff;box-shadow:0 12px 26px rgba(10,91,216,.22)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(16,32,58,.12)}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
    .mini{padding:14px;border-radius:16px;background:linear-gradient(180deg,#f8fbff,#edf4ff);border:1px solid #dbe6ff}
    .mini strong{display:block;font-size:18px;margin-bottom:4px}
    .mini span{color:var(--muted);font-size:13px}
    .hero-side{display:grid;gap:16px}
    .soft-card{padding:20px}
    .stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .stat{padding:18px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#f0f6ff);border:1px solid #dbe6ff}
    .stat strong{display:block;font-size:24px;color:var(--brand-3)}
    .stat span{font-size:13px;color:var(--muted)}
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}
    .section-title h2{margin:0;font-size:clamp(24px,3vw,34px)}
    .section-title p{margin:0;color:var(--muted);max-width:62ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .feature-card,.review-card,.case-card,.article-card,.pricing-card,.compare-card,.faq-card,.network-card,.timeline-card,.form-card{padding:18px}
    .feature-card h3,.review-card h3,.case-card h3,.article-card h3,.pricing-card h3,.timeline-card h3{margin:12px 0 8px;font-size:18px}
    .feature-card p,.review-card p,.case-card p,.article-card p,.pricing-card p,.timeline-card p,.faq-card p,.network-card p{margin:0;color:var(--muted)}
    .icon{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#e9f2ff,#dcebff);display:grid;place-items:center;color:var(--brand);font-weight:800}
    .pill-row{display:flex;gap:10px;flex-wrap:wrap}
    .pill{padding:7px 10px;border-radius:999px;background:#eff5ff;border:1px solid #dbe6ff;color:#2e4a77;font-size:12px}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:56px 1fr;gap:12px;align-items:start;padding:14px;border-radius:16px;background:#f8fbff;border:1px solid #dbe6ff}
    .timeline-item .step{width:56px;height:56px;border-radius:16px;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 #dbe6ff}
    table{width:100%;border-collapse:collapse;min-width:860px;background:#fff}
    th,td{padding:14px 16px;border-bottom:1px solid #e7efff;text-align:left;vertical-align:top}
    th{background:#f4f8ff;font-size:14px}
    tr:hover td{background:#fbfdff}
    details{border:1px solid #dbe6ff;border-radius:16px;background:#fff;overflow:hidden}
    details+details{margin-top:12px}
    summary{list-style:none;cursor:pointer;padding:16px 18px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:12px}
    summary::-webkit-details-marker{display:none}
    details .answer{padding:0 18px 16px;color:var(--muted)}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:block;font-weight:700;font-size:14px;margin-bottom:8px}
    input,select,textarea{width:100%;border:1px solid #cfdcff;border-radius:14px;padding:12px 14px;font:inherit;background:#fff;color:var(--text);outline:none;transition:.2s}
    input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(10,91,216,.12)}
    textarea{min-height:120px;resize:vertical}
    .full{grid-column:1/-1}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud a,.tag-cloud span{padding:9px 12px;border-radius:999px;background:#f2f7ff;border:1px solid #dbe6ff;color:#2b466d;font-size:13px}
    .floating{position:fixed;right:16px;bottom:16px;z-index:40;display:grid;gap:10px}
    .floating a,.floating button{border:none;border-radius:999px;padding:12px 14px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 12px 24px rgba(10,91,216,.24);cursor:pointer}
    .top-btn{display:none}
    footer{margin-top:14px;background:#0d2d72;color:#eaf1ff;padding:24px 0}
    footer a{color:#fff}
    .footer-grid{display:grid;grid-template-columns:1.3fr .9fr .8fr;gap:16px;align-items:start}
    .footer-grid p,.footer-grid li{color:#d8e4ff}
    .footer-grid ul{margin:0;padding-left:18px}
    .footer-note{margin-top:18px;padding-top:16px;border-top:1px solid rgba(255,255,255,.15);font-size:13px;color:#d8e4ff}
    .two-img{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .two-img img,.square-img img{border-radius:18px;border:1px solid #dbe6ff;box-shadow:var(--shadow);object-fit:cover}
    .square-img img{aspect-ratio:1/1;width:100%}
    .article-list{display:grid;gap:12px}
    .article-row{display:flex;justify-content:space-between;gap:12px;padding:14px 16px;border:1px solid #dbe6ff;border-radius:16px;background:#fff}
    .article-row span{color:var(--muted);font-size:13px}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .rating{color:#ffb53e;font-size:18px;letter-spacing:2px}
    .compare-badge{display:inline-flex;padding:8px 12px;border-radius:999px;background:#ecf4ff;color:var(--brand);font-weight:700}
    @media (max-width: 960px){
      .hero-grid,.grid-3,.grid-4,.split,.footer-grid,.reviews{grid-template-columns:1fr}
      .hero-points,.stats,.form-grid,.two-img{grid-template-columns:1fr 1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .nav-links.open{display:flex;position:absolute;left:16px;right:16px;top:72px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
      .nav-links.open a{padding:12px 14px}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max), calc(100% - 24px))}
      .hero-card{padding:22px}
      .hero-points,.stats,.form-grid,.two-img{grid-template-columns:1fr}
      .section-title{flex-direction:column;align-items:start}
      .floating{right:12px;bottom:12px}
      .top-btn{display:inline-flex}
    }
    .reveal{opacity:0;transform:translateY(14px);transition:all .6s ease}
    .reveal.show{opacity:1;transform:none}