:root{
      --bg:#f6f8fc;
      --panel:#ffffff;
      --panel-2:#f0f6ff;
      --text:#142033;
      --muted:#5f6b7f;
      --line:#dbe4f3;
      --brand:#2563eb;
      --brand2:#14b8a6;
      --brand3:#8b5cf6;
      --accent:#ff8a3d;
      --shadow:0 18px 40px rgba(20,32,51,.10);
      --radius:22px;
      --radius-sm:16px;
      --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;
      background:
        radial-gradient(circle at top left, rgba(37,99,235,.12), transparent 26%),
        radial-gradient(circle at top right, rgba(20,184,166,.10), transparent 22%),
        linear-gradient(180deg, #ffffff 0%, #f7faff 36%, #f4f7fb 100%);
      color:var(--text);
      line-height:1.65;
      overflow-x:hidden;
    }
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    header{
      position:sticky; top:0; z-index:50;
      backdrop-filter:saturate(1.2) blur(14px);
      background:rgba(255,255,255,.82);
      border-bottom:1px solid rgba(219,228,243,.85);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:18px;
      padding:14px 0;
    }
    .brand{
      display:flex; align-items:center; gap:12px; min-width:0;
    }
    .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;box-shadow:0 8px 18px rgba(20,32,51,.08)}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:18px;line-height:1.1}
    .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;font-size:14px
    }
    .nav-links{
      display:flex; align-items:center; gap:18px; flex-wrap:wrap; justify-content:flex-end;
    }
    .nav-links a{font-size:14px;color:var(--text);opacity:.85}
    .nav-links a:hover{opacity:1;color:var(--brand)}
    .home-link{
      padding:10px 14px;border-radius:999px;background:linear-gradient(135deg,var(--brand),var(--brand3));
      color:#fff !important; box-shadow:0 12px 24px rgba(37,99,235,.22)
    }
    main{padding:18px 0 0}
    section{padding:26px 0}
    .hero{
      position:relative;
      padding:28px 0 18px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.2fr .8fr; gap:22px; align-items:stretch;
    }
    .hero-copy,.hero-side,.card,.info-box,.faq-item,.review,.form-wrap,.timeline li,.compare,.article-list,.case-card,.price-card,.about-card,.network-card{
      background:linear-gradient(180deg,#fff, #fbfdff);
      border:1px solid rgba(219,228,243,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-copy{padding:34px}
    .kicker{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;background:#eef5ff;color:#2146a3;
      font-size:13px;font-weight:600
    }
    h1{
      margin:16px 0 12px;
      font-size:clamp(32px, 5vw, 54px);
      line-height:1.1;
      letter-spacing:-.02em
    }
    .hero-copy p{margin:0;color:var(--muted);font-size:16px;max-width:60ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:12px 18px;border-radius:14px;border:1px solid transparent;font-weight:700;font-size:15px;
      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(37,99,235,.22)}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--line)}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
    .mini{
      padding:14px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#f2f7ff);border:1px solid #deebff
    }
    .mini strong{display:block;font-size:18px}
    .mini span{font-size:13px;color:var(--muted)}
    .hero-side{padding:22px;display:grid;gap:14px}
    .side-top{
      padding:18px;border-radius:18px;background:linear-gradient(135deg, rgba(37,99,235,.10), rgba(20,184,166,.10));
      border:1px solid rgba(37,99,235,.12)
    }
    .side-top h2,.section-title h2{margin:0 0 8px;font-size:28px;line-height:1.2}
    .section-title p{margin:0;color:var(--muted)}
    .stats{
      display:grid;grid-template-columns:repeat(2,1fr);gap:12px
    }
    .stat{
      padding:16px;border-radius:18px;background:#fff;border:1px solid var(--line)
    }
    .stat strong{display:block;font-size:24px;line-height:1}
    .stat span{font-size:13px;color:var(--muted)}
    .tag-cloud,.service-list,.faq-list,.article-list,.review-grid,.case-grid,.feature-grid,.compare-grid,.network-grid,.content-grid,.price-grid,.steps{
      display:grid;gap:16px
    }
    .tag-cloud{grid-template-columns:repeat(4,1fr)}
    .tag{
      padding:14px 16px;border-radius:16px;background:#fff;border:1px solid var(--line);color:var(--text);font-weight:600;text-align:center
    }
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-title .sub{max-width:62ch;color:var(--muted)}
    .grid-3{grid-template-columns:repeat(3,1fr)}
    .grid-2{grid-template-columns:repeat(2,1fr)}
    .card,.info-box,.case-card,.price-card,.about-card,.network-card,.review,.faq-item,.form-wrap,.compare,.article-list{padding:20px}
    .card h3,.info-box h3,.case-card h3,.price-card h3,.about-card h3,.network-card h3,.review h3{margin:0 0 10px;font-size:18px}
    .card p,.info-box p,.case-card p,.price-card p,.about-card p,.network-card p,.review p{margin:0;color:var(--muted)}
    .feature-grid{grid-template-columns:repeat(3,1fr)}
    .service-list{grid-template-columns:repeat(4,1fr)}
    .service-list .card{min-height:170px}
    .steps{grid-template-columns:repeat(4,1fr)}
    .step{
      padding:18px;border-radius:20px;background:linear-gradient(180deg,#fff,#f7fbff);border:1px solid var(--line);position:relative
    }
    .step .num{
      width:34px;height:34px;border-radius:50%;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand3));color:#fff;font-weight:700;margin-bottom:12px
    }
    .compare-table{
      width:100%; border-collapse:separate; border-spacing:0; overflow:hidden; border-radius:18px; min-width:840px;
    }
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line)}
    .compare-table th,.compare-table td{
      padding:14px 14px; text-align:left; border-bottom:1px solid var(--line); background:#fff; vertical-align:top
    }
    .compare-table th{background:#f4f8ff}
    .badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:#eaf2ff;color:#2046a3;font-size:12px;font-weight:700}
    .rating{
      display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px
    }
    .stars{color:#f59e0b;font-size:18px;letter-spacing:2px}
    .timeline{grid-template-columns:repeat(4,1fr)}
    .timeline li{
      list-style:none;padding:18px;position:relative
    }
    .timeline h3{margin:0 0 8px;font-size:17px}
    .timeline p{margin:0;color:var(--muted)}
    .price-grid{grid-template-columns:repeat(3,1fr)}
    .price-card strong{font-size:30px;color:var(--brand)}
    .review-grid{grid-template-columns:repeat(3,1fr)}
    .review .role{font-size:13px;color:#2146a3;font-weight:700;margin-bottom:8px}
    .case-grid{grid-template-columns:repeat(3,1fr)}
    .faq-item summary{
      cursor:pointer; list-style:none; font-weight:700; color:var(--text); display:flex; justify-content:space-between; gap:12px;
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item p{margin:12px 0 0;color:var(--muted)}
    .article-list a{
      display:block;padding:14px 0;border-bottom:1px solid var(--line);color:var(--text)
    }
    .article-list a:last-child{border-bottom:none}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    .field label{font-size:14px;font-weight:700}
    .field input,.field select,.field textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text);font:inherit
    }
    .field textarea{min-height:120px;resize:vertical;grid-column:1/-1}
    .form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:10px}
    footer{
      margin-top:10px;background:#10243f;color:#e9f1ff;padding:30px 0 24px
    }
    footer a{color:#b9d1ff}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:start}
    .footer-grid h3,.footer-grid p{color:#e9f1ff}
    .footer-links{display:flex;flex-wrap:wrap;gap:12px}
    .footer-links a{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.08)}
    .float-box{
      position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px
    }
    .float-box a,.backtop{
      display:inline-flex;align-items:center;justify-content:center;padding:12px 14px;border-radius:14px;
      background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 16px 28px rgba(37,99,235,.20);
      border:none;cursor:pointer;font-weight:700
    }
    .backtop{display:none}
    .ai-page-image{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .media-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .media-row img{width:100%;height:auto;object-fit:cover}
    .network-grid{grid-template-columns:repeat(3,1fr)}
    .scroll-show{opacity:0;transform:translateY(18px);transition:opacity .6s ease, transform .6s ease}
    .scroll-show.in{opacity:1;transform:none}
    @media (max-width: 960px){
      .hero-grid,.grid-3,.grid-2,.feature-grid,.service-list,.steps,.timeline,.price-grid,.review-grid,.case-grid,.footer-grid,.network-grid,.media-row{grid-template-columns:1fr}
      .tag-cloud{grid-template-columns:repeat(2,1fr)}
      .section-title{flex-direction:column;align-items:start}
      .nav-toggle{display:inline-flex}
      .nav-links{display:none; width:100%; padding:14px 0 0}
      .nav-links.open{display:flex; flex-direction:column; align-items:flex-start}
      .nav{flex-wrap:wrap}
      .form-grid{grid-template-columns:1fr}
    }