:root{
      --bg:#f6f8fc;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#132238;
      --muted:#5f6b7d;
      --line:#dce5f2;
      --brand:#3b82f6;
      --brand2:#8b5cf6;
      --accent:#14b8a6;
      --warm:#ffb74d;
      --shadow:0 18px 50px rgba(31, 61, 112, .12);
      --shadow2:0 8px 24px rgba(59, 130, 246, .12);
      --radius:22px;
      --radius2:16px;
      --max: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(59,130,246,.14), transparent 28%),
        radial-gradient(circle at top right, rgba(139,92,246,.14), transparent 26%),
        linear-gradient(180deg, #fbfdff 0%, #f4f7fc 54%, #f7f9fd 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%;height:auto}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    header, main, footer{width:100%}
    .topbar{
      position:sticky;top:0;z-index:1000;
      backdrop-filter:blur(18px);
      background:rgba(246,248,252,.84);
      border-bottom:1px solid rgba(220,229,242,.78);
    }
    .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}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:5px;box-shadow:var(--shadow2)}
    .brand-txt{display:flex;flex-direction:column;line-height:1.1}
    .brand-txt strong{font-size:18px;letter-spacing:.3px}
    .brand-txt span{font-size:12px;color:var(--muted)}
    .nav-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:flex-end}
    .menu-btn{
      display:none;border:1px solid var(--line);background:#fff;color:var(--text);
      border-radius:14px;padding:10px 12px;cursor:pointer;box-shadow:var(--shadow2)
    }
    .nav-links{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
    .nav-links a{font-size:14px;color:#31445f;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover{background:#eaf2ff;color:#17315b}
    .home-link{
      display:inline-flex;align-items:center;justify-content:center;
      padding:11px 16px;border-radius:14px;
      background:linear-gradient(135deg,var(--brand),var(--brand2));
      color:#fff;font-weight:700;box-shadow:0 12px 28px rgba(59,130,246,.25);
      transition:.25s transform,.25s box-shadow;
    }
    .home-link:hover{transform:translateY(-1px);box-shadow:0 16px 34px rgba(59,130,246,.3)}
    .hero{
      padding:34px 0 24px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.18fr .82fr;gap:22px;align-items:stretch;
    }
    .hero-main,.hero-side,.section-card,.panel,.quote-card,.faq-item,.form-card,.stat,.feature,.article,.timeline-item,.price-card,.review,.compare-card,.tag-cloud,.network-card{
      background:rgba(255,255,255,.82);
      border:1px solid rgba(220,229,242,.95);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-main{padding:28px;position:relative;overflow:hidden}
    .hero-main:before,.hero-side:before{
      content:"";position:absolute;inset:auto -30px -30px auto;width:160px;height:160px;border-radius:50%;
      background:radial-gradient(circle, rgba(59,130,246,.18), transparent 65%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;
      background:rgba(59,130,246,.09);color:#1e3a8a;font-size:13px;font-weight:600;
      margin-bottom:16px;
    }
    h1{margin:0 0 14px;font-size:clamp(30px,5vw,52px);line-height:1.06;letter-spacing:-.5px}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-points{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0 0;padding:0;list-style:none}
    .hero-points li{
      padding:9px 12px;border-radius:999px;background:#f3f7ff;color:#26415f;border:1px solid #d9e6fb;font-size:13px
    }
    .cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:12px 16px;border-radius:14px;border:1px solid transparent;cursor:pointer;
      font-weight:700;transition:.25s transform,.25s box-shadow,.25s background,.25s border-color;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;box-shadow:0 14px 26px rgba(20,184,166,.2)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px)}
    .hero-side{padding:22px;display:grid;gap:14px;position:relative;overflow:hidden}
    .stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .stat{padding:16px;border-radius:18px;background:linear-gradient(180deg,#fff 0%,#f7fbff 100%)}
    .stat strong{display:block;font-size:24px;margin-bottom:4px}
    .stat span{font-size:13px;color:var(--muted);line-height:1.45}
    .mini-note{
      padding:16px;border-radius:18px;background:linear-gradient(135deg, rgba(59,130,246,.1), rgba(139,92,246,.1));
      border:1px solid rgba(120,142,255,.2);line-height:1.7;color:#26415f
    }
    section{padding:14px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:14px;margin:18px 0 14px}
    .section-head h2{margin:0;font-size:clamp(24px,3vw,34px);line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:62ch;line-height:1.7}
    .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,.article,.review,.price-card,.compare-card,.panel,.faq-item,.timeline-item,.network-card,.quote-card{padding:20px}
    .feature h3,.article h3,.review h3,.price-card h3,.compare-card h3,.network-card h3{margin:0 0 10px;font-size:18px}
    .feature p,.article p,.review p,.price-card p,.network-card p{margin:0;color:var(--muted);line-height:1.75}
    .icon-badge{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;margin-bottom:14px;
      background:linear-gradient(135deg, rgba(59,130,246,.14), rgba(20,184,166,.14));color:#1747a6;font-weight:900
    }
    .chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
    .chip{font-size:12px;padding:7px 10px;border-radius:999px;background:#f1f5fb;border:1px solid #dde7f4;color:#345}
    .section-card{padding:22px}
    .split{
      display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start
    }
    .list{margin:0;padding:0;list-style:none;display:grid;gap:10px}
    .list li{display:flex;gap:10px;align-items:flex-start;color:#2f4258;line-height:1.7}
    .list li:before{content:"";width:10px;height:10px;margin-top:7px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));flex:none}
    .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 #e8eef6;text-align:left;font-size:14px;vertical-align:top}
    th{background:#f8fbff;color:#20324d}
    td{color:#31445f}
    .rating{
      display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:12px 0 0
    }
    .stars{color:#f59e0b;font-size:18px;letter-spacing:2px}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .timeline-item{position:relative}
    .timeline-item .step{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:12px;background:#eff6ff;color:#1747a6;font-weight:800;margin-bottom:12px}
    .dual-imgs{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .img-card{border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow2)}
    .img-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
    .img-card .cap{padding:12px 14px;color:#31445f;font-size:14px}
    .service-network{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .tag-cloud{padding:18px;display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud a{padding:9px 12px;border-radius:999px;background:#f4f7fd;border:1px solid #dce6f3;color:#344966;font-size:13px}
    .faq{display:grid;gap:12px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{
      width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 20px;
      background:transparent;border:0;color:var(--text);font-size:16px;font-weight:700;cursor:pointer;text-align:left
    }
    .faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 20px}
    .faq-item.open .faq-a{max-height:240px;padding-bottom:18px}
    .faq-a p{margin:0;color:var(--muted);line-height:1.75}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}
    .badge{font-size:12px;padding:7px 10px;border-radius:999px;background:#edf7ff;color:#1856a8;border:1px solid #d6e8ff}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article time{display:block;font-size:12px;color:#6d7b8f;margin-bottom:10px}
    .form-card form{display:grid;gap:12px}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    input,select,textarea{
      width:100%;border:1px solid #d8e2ef;background:#fff;color:var(--text);
      border-radius:14px;padding:12px 14px;font:inherit;outline:none;transition:.2s border-color,.2s box-shadow
    }
    input:focus,select:focus,textarea:focus{border-color:#7cb0ff;box-shadow:0 0 0 4px rgba(59,130,246,.12)}
    textarea{min-height:120px;resize:vertical}
    .footer{
      margin-top:18px;padding:26px 0 18px;border-top:1px solid rgba(220,229,242,.9);
      background:linear-gradient(180deg, rgba(255,255,255,.55), rgba(242,246,252,.95));
      color:#24374f
    }
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:18px}
    .footer h3{margin:0 0 12px;font-size:16px}
    .footer p,.footer a,.footer li{color:#344966;line-height:1.8;font-size:14px}
    .footer ul{margin:0;padding:0;list-style:none;display:grid;gap:6px}
    .copyright{margin-top:18px;padding-top:16px;border-top:1px solid #dfe7f2;color:#607086;font-size:13px}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:1100;display:grid;gap:10px
    }
    .float-btn{
      width:48px;height:48px;border-radius:16px;border:1px solid rgba(255,255,255,.55);
      background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;display:grid;place-items:center;
      box-shadow:0 18px 36px rgba(59,130,246,.24);cursor:pointer
    }
    .service-pop{
      position:fixed;right:16px;bottom:74px;z-index:1100;width:min(320px, calc(100vw - 32px));
      background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:16px;display:none
    }
    .service-pop.open{display:block}
    .service-pop .qr{display:flex;gap:14px;align-items:center}
    .service-pop .qr img{width:88px;height:88px;object-fit:cover;border-radius:14px;border:1px solid var(--line)}
    .service-pop h3{margin:0 0 6px}
    .service-pop p{margin:0;color:var(--muted);line-height:1.7;font-size:14px}
    .scroll-top{position:fixed;right:16px;bottom:130px;z-index:1100;opacity:0;pointer-events:none;transform:translateY(8px);transition:.25s}
    .scroll-top.show{opacity:1;pointer-events:auto;transform:none}
    .fade-up{opacity:0;transform:translateY(18px);transition:opacity .7s ease, transform .7s ease}
    .fade-up.show{opacity:1;transform:none}
    .note-bar{
      display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;
      padding:16px 18px;border-radius:18px;background:linear-gradient(135deg, rgba(59,130,246,.08), rgba(20,184,166,.08));
      border:1px solid rgba(123,152,213,.2);margin-top:16px
    }
    .note-bar strong{font-size:16px}
    .note-bar span{color:var(--muted);line-height:1.6}
    .compare-highlight{
      display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:14px
    }
    .compare-highlight .stat{background:#fff}
    .hero-side .panel{background:linear-gradient(180deg,#fff, #f8fbff)}
    .panel ul{margin:0;padding-left:18px;color:var(--muted);line-height:1.8}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.split,.grid-3,.grid-4,.timeline,.reviews,.articles,.footer-grid,.service-network,.compare-highlight{grid-template-columns:1fr 1fr}
      .grid-4,.timeline,.service-network,.compare-highlight{grid-template-columns:repeat(2,1fr)}
      .hero-grid{grid-template-columns:1fr}
      .nav-links{display:none;width:100%;padding:10px 0 0}
      .nav-links.open{display:flex;flex-direction:column;align-items:flex-start;gap:6px}
      .menu-btn{display:inline-flex}
      .nav{align-items:flex-start;flex-wrap:wrap}
      .nav-actions{width:100%;justify-content:space-between}
      .form-grid{grid-template-columns:1fr}
      .mobile-only{display:block}
    }
    @media (max-width: 680px){
      .container{width:min(var(--max), calc(100% - 22px))}
      .hero-main,.hero-side,.section-card,.feature,.article,.review,.price-card,.compare-card,.panel,.faq-item,.timeline-item,.network-card,.quote-card,.form-card{padding:16px}
      h1{font-size:30px}
      .grid-3,.grid-4,.timeline,.reviews,.articles,.footer-grid,.service-network,.compare-highlight,.stat-grid,.dual-imgs,.split{grid-template-columns:1fr}
      .section-head{align-items:flex-start;flex-direction:column}
      .cta-row{flex-direction:column}
      .btn,.home-link{width:100%}
      .topbar .container{width:min(var(--max), calc(100% - 22px))}
    }