:root{
      --bg:#f5f7fb;
      --panel:#ffffff;
      --panel-2:#f8fbff;
      --text:#152033;
      --muted:#5f6b81;
      --line:#dbe3f0;
      --brand:#3b82f6;
      --brand-2:#8b5cf6;
      --accent:#13c2c2;
      --warm:#ffb74d;
      --shadow:0 18px 50px rgba(23, 37, 84, .10);
      --shadow-soft:0 10px 30px rgba(23, 37, 84, .08);
      --radius:20px;
      --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;
      background:
        radial-gradient(circle at 10% 10%, rgba(59,130,246,.10), transparent 26%),
        radial-gradient(circle at 90% 0%, rgba(139,92,246,.10), transparent 30%),
        linear-gradient(180deg, #f7fbff 0%, #f5f7fb 48%, #f7f9fd 100%);
      color:var(--text);
      line-height:1.7;
    }
    img{display:block;max-width:100%}
    a{color:var(--brand);text-decoration:none}
    a:hover{color:#1d4ed8}
    .site-wrap{position:relative;overflow:hidden}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .topbar{
      position:sticky; top:0; z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(245,247,251,.82);
      border-bottom:1px solid rgba(219,227,240,.8);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:16px;
      padding:12px 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(--shadow-soft)}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:16px;line-height:1.2}
    .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);padding:8px 10px;border-radius:10px}
    .nav-links a:hover{background:rgba(59,130,246,.08);color:#1d4ed8}
    .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:14px;padding:12px 16px;
      font-weight:700;font-size:14px;transition:.22s ease;
      box-shadow:0 10px 24px rgba(59,130,246,.16);
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 26px rgba(59,130,246,.22);color:#fff}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text);box-shadow:none}
    .btn-ghost:hover{border-color:#b9c8e6;background:#f8fbff;color:#0f172a}
    main{display:block}
    .hero{
      padding:46px 0 30px;
      position:relative;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch
    }
    .hero-card,.hero-side,.section-card,.faq-item,.review-card,.article-card,.service-card,.metric-card,.compare-card,.form-card,.timeline-card{
      background:linear-gradient(180deg, rgba(255,255,255,.98), rgba(247,250,255,.98));
      border:1px solid rgba(219,227,240,.9);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-card{padding:28px;position:relative;overflow:hidden}
    .hero-card:before{
      content:"";position:absolute;inset:-40% -10% auto auto;width:280px;height:280px;border-radius:50%;
      background:radial-gradient(circle, rgba(59,130,246,.16), transparent 68%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;
      background:rgba(19,194,194,.10);color:#0f766e;font-weight:700;font-size:13px;
      border:1px solid rgba(19,194,194,.16)
    }
    h1{
      margin:14px 0 12px;font-size:clamp(30px,4vw,52px);line-height:1.08;letter-spacing:-.03em
    }
    .hero p{margin:0;color:var(--muted);font-size:16px;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
    .point{
      padding:14px;border-radius:16px;background:rgba(59,130,246,.05);border:1px solid rgba(59,130,246,.10)
    }
    .point strong{display:block;font-size:16px}
    .point span{display:block;color:var(--muted);font-size:13px;margin-top:4px}
    .hero-side{padding:18px;display:grid;gap:12px}
    .side-panel{padding:18px;border-radius:18px;background:linear-gradient(135deg, rgba(59,130,246,.08), rgba(139,92,246,.08));border:1px solid rgba(59,130,246,.12)}
    .side-panel h2{margin:0 0 8px;font-size:18px}
    .side-panel ul{margin:0;padding-left:18px;color:var(--text)}
    .side-panel li{margin:8px 0;color:var(--muted)}
    .quick-tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 11px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--text);font-size:13px;box-shadow:0 8px 20px rgba(15,23,42,.04)}
    section{padding:18px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:28px;line-height:1.2}
    .section-head p{margin:0;color:var(--muted);max-width:70ch}
    .section-card{padding:22px}
    .metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .metric-card{padding:18px;background:linear-gradient(180deg,#fff, #f8fbff);transition:transform .2s ease, box-shadow .2s ease}
    .metric-card:hover{transform:translateY(-3px);box-shadow:0 18px 36px rgba(23,37,84,.12)}
    .metric-card strong{display:block;font-size:26px}
    .metric-card span{color:var(--muted);font-size:13px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .service-card{padding:18px;transition:.2s ease}
    .service-card:hover{transform:translateY(-4px);box-shadow:0 18px 36px rgba(23,37,84,.12)}
    .service-card h3,.article-card h3,.review-card h3,.compare-card h3{margin:0 0 8px;font-size:18px}
    .service-card p,.article-card p,.review-card p{margin:0;color:var(--muted)}
    .service-card .meta{margin-top:12px;color:#0f766e;font-size:13px;font-weight:700}
    .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line);position:relative}
    .step .num{display:inline-flex;width:34px;height:34px;border-radius:12px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:800}
    .step h3{margin:12px 0 8px;font-size:17px}
    .step p{margin:0;color:var(--muted);font-size:14px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:780px}
    th,td{padding:14px 16px;text-align:left;border-bottom:1px solid #eef2f7;vertical-align:top}
    th{background:#f7fbff;color:#0f172a;font-size:14px}
    td{color:var(--text);font-size:14px}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700}
    .badge.good{background:rgba(19,194,194,.12);color:#0f766e}
    .badge.brand{background:rgba(59,130,246,.12);color:#1d4ed8}
    .badge.warm{background:rgba(255,183,77,.16);color:#a16207}
    .compare-grid{display:grid;grid-template-columns:1fr .9fr;gap:14px}
    .compare-card{padding:18px}
    .compare-score{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px;border-radius:18px;background:linear-gradient(135deg, rgba(59,130,246,.09), rgba(139,92,246,.09))}
    .score-big{font-size:42px;line-height:1;font-weight:900}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .timeline-card{padding:18px}
    .timeline-card h3{margin:10px 0 8px;font-size:17px}
    .timeline-card p{margin:0;color:var(--muted);font-size:14px}
    .gallery{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .media-card{padding:14px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .media-card img{border-radius:14px;width:100%;height:auto}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .review-card{padding:18px}
    .review-card .role{color:#1d4ed8;font-size:13px;font-weight:700;margin-bottom:10px}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .article-card{padding:18px}
    .article-card .date{color:#0f766e;font-weight:700;font-size:13px;margin-bottom:8px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud .tag{background:linear-gradient(180deg,#fff, #f7fbff)}
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
      padding:18px 20px;border:0;background:transparent;color:var(--text);font-size:16px;font-weight:700;text-align:left;cursor:pointer
    }
    .faq-q span{color:var(--muted);font-weight:600}
    .faq-a{max-height:0;overflow:hidden;padding:0 20px;color:var(--muted);transition:max-height .28s ease,padding .28s ease}
    .faq-item.open .faq-a{padding:0 20px 18px;max-height:180px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .form-card{padding:18px}
    label{display:block;font-size:14px;font-weight:700;margin-bottom:8px;color:var(--text)}
    input,select,textarea{
      width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;
      padding:12px 14px;font:inherit;color:var(--text);outline:none;transition:border-color .2s ease, box-shadow .2s ease
    }
    input:focus,select:focus,textarea:focus{border-color:#8fb4ff;box-shadow:0 0 0 4px rgba(59,130,246,.10)}
    textarea{min-height:120px;resize:vertical}
    .full{grid-column:1/-1}
    .footer{
      margin-top:16px;padding:22px 0 28px;border-top:1px solid rgba(219,227,240,.9);
      background:rgba(255,255,255,.52)
    }
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:start}
    .footer h2{margin:0 0 10px;font-size:20px}
    .footer p,.footer a,.footer li{color:var(--muted);font-size:14px}
    .footer a{color:#1d4ed8}
    .footer-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px 16px;padding:0;margin:0;list-style:none}
    .copy{margin-top:18px;padding-top:14px;border-top:1px solid #e7edf6;color:var(--muted);font-size:13px}
    .floating{
      position:fixed;right:16px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--brand),var(--brand-2));
      color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900;box-shadow:var(--shadow);border:0;cursor:pointer
    }
    .service-float{
      position:fixed;left:16px;bottom:16px;z-index:60;background:#fff;border:1px solid var(--line);
      border-radius:18px;padding:12px;box-shadow:var(--shadow);width:240px
    }
    .service-float .mini{display:flex;gap:10px;align-items:center}
    .service-float img{width:60px;height:60px;object-fit:cover;border-radius:12px;border:1px solid var(--line)}
    .service-float strong{display:block;font-size:14px}
    .service-float span{display:block;color:var(--muted);font-size:12px}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:opacity .45s ease, transform .45s ease}
    .scroll-reveal.show{opacity:1;transform:translateY(0)}
    .home-link-inline{display:inline-flex;align-items:center;gap:8px}
    .section-subtitle{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
    .pricing-mini{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .price-card{padding:18px;border-radius:18px;border:1px solid var(--line);background:#fff}
    .price-card strong{display:block;font-size:22px}
    .price-card span{color:var(--muted);font-size:13px}
    .center-note{padding:14px 16px;border-radius:16px;background:rgba(19,194,194,.08);border:1px solid rgba(19,194,194,.12);color:#0f766e}
    @media (max-width: 1024px){
      .hero-grid,.compare-grid,.footer-grid,.form-grid,.gallery{grid-template-columns:1fr}
      .metrics,.grid-3,.flow,.timeline,.reviews,.articles,.pricing-mini{grid-template-columns:repeat(2,1fr)}
      .hero-points{grid-template-columns:1fr}
      .nav-links{display:none}
      .nav-toggle{display:inline-flex}
      .nav.open .nav-links{
        display:flex;position:absolute;left:16px;right:16px;top:66px;flex-direction:column;align-items:stretch;
        background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)
      }
    }
    @media (max-width: 720px){
      .container{width:min(var(--container), calc(100% - 22px))}
      .hero{padding-top:24px}
      .hero-card,.hero-side,.section-card,.form-card{padding:18px}
      .metrics,.grid-3,.flow,.timeline,.reviews,.articles,.pricing-mini{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .service-float{display:none}
      .footer-list{grid-template-columns:1fr}
      .nav-cta .btn-ghost{display:none}
    }