:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-soft:#fbfcff;
      --line:#e6eaf2;
      --text:#1d2736;
      --muted:#5f6b7c;
      --brand:#3f66ff;
      --brand2:#8b5cf6;
      --brand3:#24c1a6;
      --warm:#ffb55b;
      --shadow:0 18px 40px rgba(29,39,54,.08);
      --shadow2:0 10px 22px rgba(63,102,255,.14);
      --radius:20px;
      --radius2:14px;
      --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",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at 15% 10%, rgba(63,102,255,.10), transparent 26%),
        radial-gradient(circle at 85% 15%, rgba(139,92,246,.12), transparent 22%),
        radial-gradient(circle at 50% 0%, rgba(36,193,166,.08), transparent 20%),
        linear-gradient(180deg,#f9fbff 0%, #f5f7fc 36%, #f7f8fc 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%;height:auto}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:40;
      backdrop-filter:saturate(180%) blur(12px);
      background:rgba(247,248,252,.86);
      border-bottom:1px solid rgba(230,234,242,.8);
    }
    .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;border-radius:12px;object-fit:contain;background:#fff;border:1px solid var(--line);padding:5px;box-shadow:0 8px 20px rgba(29,39,54,.06)}
    .brand h1,.brand .site-name{margin:0;font-size:18px;line-height:1.1;font-weight:800;letter-spacing:.3px}
    .brand .sub{display:block;font-size:12px;color:var(--muted);font-weight:500;margin-top:4px}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--muted);padding:8px 0;position:relative}
    .nav-links a::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:linear-gradient(90deg,var(--brand),var(--brand2));transform:scaleX(0);transform-origin:left;transition:.25s}
    .nav-links a:hover{color:var(--text)}
    .nav-links a:hover::after{transform:scaleX(1)}
    .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 18px;
      font-weight:700;font-size:14px;transition:.24s ease;cursor:pointer;white-space:nowrap
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow2)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(63,102,255,.22)}
    .btn-ghost{background:#fff;color:var(--text);border-color:var(--line)}
    .btn-ghost:hover{border-color:#cdd6ea;transform:translateY(-1px)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    .hero{
      padding:54px 0 26px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch
    }
    .hero-card{
      background:
        linear-gradient(135deg, rgba(63,102,255,.96), rgba(139,92,246,.94) 58%, rgba(36,193,166,.92));
      color:#fff;border-radius:28px;padding:34px;position:relative;overflow:hidden;box-shadow:0 24px 50px rgba(63,102,255,.20)
    }
    .hero-card::before,.hero-card::after{
      content:"";position:absolute;border-radius:50%;filter:blur(6px);opacity:.26;pointer-events:none
    }
    .hero-card::before{width:220px;height:220px;background:#fff;right:-80px;top:-70px}
    .hero-card::after{width:180px;height:180px;background:#9ef2e4;left:-60px;bottom:-70px}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.18);
      font-size:13px;font-weight:600
    }
    .hero h2{margin:18px 0 14px;font-size:clamp(30px,5vw,52px);line-height:1.06;letter-spacing:-.6px}
    .hero p{margin:0;color:rgba(255,255,255,.92);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-actions .btn{padding:13px 18px}
    .hero-actions .btn-secondary{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.22)}
    .hero-actions .btn-secondary:hover{background:rgba(255,255,255,.20)}
    .hero-stats{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:28px
    }
    .stat{
      background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.15);border-radius:18px;padding:16px
    }
    .stat strong{display:block;font-size:24px;line-height:1.1}
    .stat span{display:block;margin-top:6px;font-size:13px;color:rgba(255,255,255,.88);line-height:1.5}
    .side-stack{display:grid;gap:16px}
    .side-card{
      background:rgba(255,255,255,.85);border:1px solid rgba(230,234,242,.95);backdrop-filter:blur(8px);
      border-radius:24px;padding:22px;box-shadow:var(--shadow)
    }
    .side-card h3,.section-title{margin:0 0 10px;font-size:22px;line-height:1.2}
    .side-card p,.text{margin:0;color:var(--muted);line-height:1.8}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
    .tag{padding:9px 12px;border-radius:999px;background:#f3f6ff;border:1px solid #e2e8ff;color:#32415d;font-size:13px}
    .section{padding:22px 0}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:16px}
    .section-head .lead{max-width:70ch;color:var(--muted);line-height:1.8}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .card{
      background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow);
      transition:.22s ease
    }
    .card:hover{transform:translateY(-4px);box-shadow:0 22px 40px rgba(29,39,54,.10)}
    .card h3,.card h4{margin:0 0 10px;line-height:1.25}
    .card p{margin:0;color:var(--muted);line-height:1.8}
    .metric{display:flex;flex-direction:column;gap:8px;min-height:132px}
    .metric .num{font-size:30px;font-weight:900;letter-spacing:-.5px;color:#1e2c4f}
    .metric .hint{font-size:14px;color:var(--muted);line-height:1.6}
    .section-alt{padding:16px 0}
    .feature-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .feature{
      border:1px solid var(--line);background:linear-gradient(180deg,#fff,#fbfcff);border-radius:18px;padding:18px;display:flex;gap:14px;align-items:flex-start
    }
    .icon{
      width:42px;height:42px;border-radius:14px;flex:0 0 42px;display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(63,102,255,.12), rgba(139,92,246,.12));color:#3551d6;font-weight:800
    }
    .feature strong{display:block;margin-bottom:6px}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .step{
      position:relative;background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px 18px 18px
    }
    .step .index{
      width:34px;height:34px;border-radius:12px;display:grid;place-items:center;margin-bottom:12px;
      background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800
    }
    .table-wrap{overflow:auto;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 18px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f7f9ff;color:#24324b;font-size:14px}
    td{color:var(--muted);line-height:1.7}
    tr:last-child td{border-bottom:none}
    .pill{display:inline-flex;align-items:center;padding:7px 10px;border-radius:999px;background:#f2f5ff;color:#3652d5;font-size:12px;font-weight:700}
    .quote-card{display:flex;flex-direction:column;gap:12px;height:100%}
    .quote-card .user{display:flex;align-items:center;justify-content:space-between;gap:10px}
    .quote-card .role{font-size:13px;color:#6a7384}
    .stars{color:#f59e0b;letter-spacing:1px}
    .timeline{display:grid;gap:12px}
    .time-item{display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:start;padding:16px 0;border-bottom:1px dashed #dde4f2}
    .time-item:last-child{border-bottom:none;padding-bottom:0}
    .time-item strong{display:block}
    .time-item span{color:var(--muted);line-height:1.7}
    .qa-item{
      border:1px solid var(--line);border-radius:18px;background:#fff;overflow:hidden
    }
    .qa-btn{
      width:100%;padding:18px 20px;background:transparent;border:none;color:var(--text);display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:16px;font-weight:700;text-align:left;cursor:pointer
    }
    .qa-btn .plus{font-size:22px;color:var(--brand)}
    .qa-content{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 20px}
    .qa-content p{margin:0 0 18px;color:var(--muted);line-height:1.8}
    .qa-item.active .qa-content{max-height:240px}
    .qa-item.active .qa-btn{background:linear-gradient(180deg,#fbfcff,#f7f9ff)}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .form-grid .full{grid-column:1/-1}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700;color:#344255}
    input,select,textarea{
      width:100%;border:1px solid #d8deea;background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:.2s
    }
    input:focus,select:focus,textarea:focus{border-color:#97abff;box-shadow:0 0 0 4px rgba(63,102,255,.09)}
    textarea{min-height:120px;resize:vertical}
    .form-note{font-size:13px;color:var(--muted);line-height:1.7}
    .footer{
      margin-top:10px;padding:26px 0 30px;border-top:1px solid rgba(230,234,242,.9);background:rgba(247,248,252,.9)
    }
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
    .footer a{color:#2f4fd4}
    .footer .small{font-size:13px;color:var(--muted);line-height:1.8}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:50;display:flex;flex-direction:column;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:16px;border:1px solid rgba(230,234,242,.95);background:#fff;box-shadow:var(--shadow);display:grid;place-items:center;cursor:pointer
    }
    .float-btn:hover{transform:translateY(-2px)}
    .mobile-panel{display:none}
    .articles-list,.link-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .article,.link-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}
    .article time{display:block;font-size:12px;color:#7a8495;margin-bottom:10px}
    .article h4{margin:0 0 8px;font-size:16px}
    .article p{margin:0;color:var(--muted);line-height:1.7}
    .service-net{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .net-item{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}
    .net-item strong{display:block;margin-bottom:8px}
    .banner-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .banner-row .ai-page-image,.banner-row img{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.55s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    @media (max-width: 1080px){
      .hero-grid,.grid-4,.steps,.grid-3,.service-net,.articles-list,.link-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-grid{grid-template-columns:1fr}
    }
    @media (max-width: 760px){
      .nav-links,.nav-cta{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-panel{
        display:none;padding:0 0 16px
      }
      .mobile-panel.open{display:block}
      .mobile-links{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:0 0 10px}
      .mobile-links a{
        background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px;color:#334057;font-size:14px
      }
      .hero{padding-top:22px}
      .hero-grid,.grid-4,.grid-3,.feature-list,.steps,.form-grid,.banner-row,.articles-list,.link-grid,.service-net{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .hero-card{padding:24px;border-radius:24px}
      .hero h2{font-size:32px}
      .hero-stats{grid-template-columns:1fr 1fr}
      .time-item{grid-template-columns:1fr;gap:8px}
      .floating{right:12px;bottom:12px}
    }