:root{
      --bg:#f6f8fc;
      --panel:#ffffff;
      --panel-2:#f1f5ff;
      --text:#142033;
      --muted:#5d6b86;
      --line:#dbe3f3;
      --brand:#4f7cff;
      --brand-2:#8a5cff;
      --accent:#14c7a5;
      --warm:#ffb14a;
      --shadow:0 18px 50px rgba(33,56,125,.10);
      --shadow-soft:0 10px 24px rgba(33,56,125,.08);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-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(79,124,255,.10), transparent 28%),
        radial-gradient(circle at top right, rgba(138,92,255,.10), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f5f7fc 36%, #f7f9fd 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--container));margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(248,251,255,.82);
      border-bottom:1px solid rgba(219,227,243,.72);
    }
    .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;object-fit:contain;border-radius:12px;background:#fff;box-shadow:var(--shadow-soft)}
    .brand h2{margin:0;font-size:18px;line-height:1.1}
    .brand p{margin:3px 0 0;color:var(--muted);font-size:12px}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#2b3852;padding:8px 10px;border-radius:999px;transition:.2s ease}
    .nav-links a:hover{background:#edf3ff;color:#13308a}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:1px solid transparent;border-radius:999px;
      padding:12px 16px;font-weight:700;font-size:14px;cursor:pointer;
      transition:transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
      white-space:nowrap;
    }
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-soft)}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}
    .btn-secondary{background:#fff;border-color:var(--line);color:#20304f}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.18fr .82fr;gap:22px;align-items:stretch;
    }
    .hero-main,.hero-side,.section-card,.feature-card,.review-card,.faq-item,.timeline-card,.article-card,.price-card,.compare-card,.contact-card,.network-card,.service-card{
      background:rgba(255,255,255,.88);
      border:1px solid rgba(219,227,243,.9);
      border-radius:var(--radius);
      box-shadow:var(--shadow-soft);
    }
    .hero-main{
      padding:34px;
      position:relative;overflow:hidden;
      background:
        linear-gradient(135deg, rgba(255,255,255,.96), rgba(244,248,255,.92)),
        radial-gradient(circle at right top, rgba(79,124,255,.12), transparent 30%);
    }
    .hero-main::after{
      content:"";
      position:absolute;inset:auto -20px -30px auto;width:180px;height:180px;border-radius:50%;
      background:radial-gradient(circle, rgba(20,199,165,.25), transparent 60%);
      filter:blur(8px);
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;
      background:linear-gradient(135deg, rgba(79,124,255,.12), rgba(138,92,255,.12));
      color:#2443a7;font-size:13px;font-weight:700;
    }
    h1{margin:16px 0 12px;font-size:clamp(30px,4vw,52px);line-height:1.08;letter-spacing:-.02em}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.9;max-width:56ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 18px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:18px}
    .point{
      padding:14px 14px 12px;border-radius:16px;background:#f7faff;border:1px solid #e2e9f8;
    }
    .point strong{display:block;font-size:20px;color:#16306f}
    .point span{display:block;margin-top:4px;color:var(--muted);font-size:13px;line-height:1.5}
    .hero-side{padding:22px;display:grid;gap:14px}
    .side-box{
      border-radius:18px;padding:16px;background:linear-gradient(180deg,#ffffff,#f6f9ff);border:1px solid #e2e9f8;
    }
    .side-box h3{margin:0 0 8px;font-size:16px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{
      display:inline-flex;align-items:center;padding:8px 11px;border-radius:999px;
      background:#edf3ff;color:#2443a7;font-size:13px;border:1px solid #d8e3ff;
    }
    .section{padding:18px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin:8px 0 16px}
    .section-head h2{margin:0;font-size:28px;line-height:1.2}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.8}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .metric,.service-card,.feature-card,.price-card,.article-card,.review-card,.compare-card,.contact-card,.network-card,.timeline-card{padding:18px}
    .metric{position:relative;overflow:hidden}
    .metric .num{font-size:28px;font-weight:800;color:#14306e}
    .metric .label{margin-top:8px;font-size:14px;font-weight:700}
    .metric .desc{margin-top:6px;color:var(--muted);font-size:13px;line-height:1.6}
    .metric::before{
      content:"";position:absolute;inset:auto -20px -20px auto;width:110px;height:110px;border-radius:50%;
      background:radial-gradient(circle, rgba(79,124,255,.16), transparent 60%);
    }
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .feature-card h3,.service-card h3,.review-card h3,.compare-card h3,.contact-card h3,.network-card h3,.timeline-card h3,.price-card h3,.article-card h3{margin:0 0 10px;font-size:18px}
    .feature-card p,.service-card p,.review-card p,.compare-card p,.contact-card p,.network-card p,.timeline-card p,.price-card p,.article-card p{margin:0;color:var(--muted);line-height:1.8}
    .icon-badge{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(79,124,255,.14), rgba(20,199,165,.12));
      color:#2443a7;font-weight:800;margin-bottom:12px;
    }
    .section-card{padding:20px}
    .workflow{
      display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px
    }
    .step{padding:18px;border-radius:18px;background:#fff;border:1px solid #e2e9f8;position:relative}
    .step .idx{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:800;margin-bottom:12px}
    .step h3{margin:0 0 8px;font-size:16px}
    .step p{margin:0;color:var(--muted);line-height:1.7;font-size:14px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid #e2e9f8}
    table{width:100%;border-collapse:collapse;background:#fff;min-width:900px}
    th,td{padding:14px 16px;text-align:left;border-bottom:1px solid #e9eef9;vertical-align:top}
    th{background:#f5f8ff;color:#1d2f58;font-size:14px}
    td{color:#31405f;font-size:14px;line-height:1.7}
    .rating{font-weight:800;color:#113aa9}
    .faq-list{display:grid;gap:12px}
    .faq-item summary{
      list-style:none;cursor:pointer;padding:18px 18px;font-weight:700;color:#18284b;
      display:flex;justify-content:space-between;gap:14px;align-items:center;
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary::after{content:"+";font-size:22px;color:#4866ba}
    .faq-item[open] summary::after{content:"–"}
    .faq-item .answer{padding:0 18px 18px;color:var(--muted);line-height:1.8}
    .review-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .stars{color:#ffb14a;font-size:16px;letter-spacing:2px;margin-bottom:10px}
    .timeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .timeline-card .when{display:inline-flex;padding:6px 10px;border-radius:999px;background:#edf3ff;color:#22439c;font-size:12px;font-weight:700;margin-bottom:10px}
    .article-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .article-card a.more{display:inline-flex;margin-top:12px;color:#2450d3;font-weight:700}
    .price-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .price{font-size:30px;font-weight:900;color:#17306f;margin:10px 0}
    .check-list{list-style:none;padding:0;margin:14px 0 0;display:grid;gap:10px}
    .check-list li{display:flex;gap:10px;align-items:flex-start;color:#31405f;line-height:1.7}
    .check-list li::before{content:"✔";color:var(--accent);font-weight:900;margin-top:1px}
    .contact-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:14px}
    .form{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px
    }
    .form .full{grid-column:1 / -1}
    input,select,textarea{
      width:100%;border:1px solid #dbe3f3;background:#fff;color:#142033;
      border-radius:14px;padding:13px 14px;font:inherit;outline:none;transition:border-color .18s ease, box-shadow .18s ease;
    }
    input:focus,select:focus,textarea:focus{border-color:#85a7ff;box-shadow:0 0 0 4px rgba(79,124,255,.10)}
    textarea{min-height:120px;resize:vertical}
    .inline-contact{
      display:grid;gap:12px
    }
    .contact-chip{
      display:flex;justify-content:space-between;gap:10px;padding:14px 16px;border-radius:16px;background:#f7faff;border:1px solid #e2e9f8;color:#20304f
    }
    .footer{
      margin-top:18px;padding:22px 0 28px;border-top:1px solid rgba(219,227,243,.9)
    }
    .footer-inner{display:grid;grid-template-columns:1.2fr .8fr;gap:14px;align-items:start}
    .footer p,.footer a,.footer li{color:#31405f}
    .footer .small{color:#667690;font-size:13px;line-height:1.8}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 10px;border-radius:999px;background:#eef4ff;border:1px solid #dce5f7}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:50%;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;
      box-shadow:var(--shadow);border:none;cursor:pointer;font-size:18px
    }
    .float-panel{
      width:min(320px, calc(100vw - 36px));display:none;padding:16px;border-radius:18px;background:#fff;border:1px solid #dbe3f3;box-shadow:var(--shadow)
    }
    .floating.open .float-panel{display:block}
    .floating.open .float-btn{transform:rotate(45deg)}
    .backtop{position:fixed;right:18px;bottom:84px;z-index:58;display:none}
    .backtop.show{display:block}
    .muted{color:var(--muted)}
    .section-anchor{scroll-margin-top:92px}
    .mobile-only{display:none}
    .service-network{
      display:grid;grid-template-columns:1.1fr .9fr;gap:14px
    }
    .badge-row{display:flex;flex-wrap:wrap;gap:10px}
    .badge-row span{padding:8px 10px;border-radius:999px;background:#f2f6ff;border:1px solid #dde7fb;color:#274494;font-size:13px}
    .logo-line{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
    .img-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
    .img-row img{width:100%;border-radius:16px;aspect-ratio:1/1;object-fit:cover;border:1px solid #e2e9f8;background:#fff}
    .banner-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .banner-row img{width:100%;border-radius:18px;aspect-ratio:16/9;object-fit:cover;border:1px solid #e2e9f8}
    .fade-up{opacity:0;transform:translateY(18px);transition:opacity .6s ease, transform .6s ease}
    .fade-up.in{opacity:1;transform:none}
    @media (max-width: 980px){
      .hero-grid,.grid-4,.grid-3,.workflow,.review-grid,.timeline,.article-list,.price-grid,.contact-grid,.service-network,.footer-inner{grid-template-columns:1fr}
      .hero-points{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .desktop-only{display:none}
      .mobile-only{display:block}
      .hero-main{padding:24px}
      .form{grid-template-columns:1fr}
      .img-row{grid-template-columns:repeat(2,minmax(0,1fr))}
      .banner-row{grid-template-columns:1fr}
    }