:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#fbfbfe;
      --text:#1e2430;
      --muted:#5f6b80;
      --line:#e5e8f2;
      --brand:#6b5cff;
      --brand-2:#14b8a6;
      --warm:#ff7a59;
      --shadow:0 18px 50px rgba(26,34,58,.08);
      --shadow-soft:0 10px 28px rgba(26,34,58,.06);
      --radius:22px;
      --radius-sm:14px;
      --max: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 top left, rgba(107,92,255,.10), transparent 30%),
        radial-gradient(circle at top right, rgba(20,184,166,.08), transparent 24%),
        linear-gradient(180deg,#fbfbff 0%, #f7f8fc 42%, #f5f7fb 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{position:relative}
    .topbar{
      position:sticky;top:0;z-index:40;
      backdrop-filter:saturate(160%) blur(18px);
      background:rgba(247,248,252,.82);
      border-bottom:1px solid rgba(229,232,242,.8);
    }
    .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);padding:6px}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:16px;letter-spacing:.4px}
    .brand-text span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
    .menu{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
    .menu a{font-size:14px;color:#334155;padding:8px 10px;border-radius:10px;transition:.2s}
    .menu a:hover{background:#eef1ff;color:#2b2a67}
    .nav-actions{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:11px 16px;
      font-size:14px;font-weight:700;line-height:1;transition:.25s;cursor:pointer;
      box-shadow:0 8px 20px rgba(107,92,255,.12);
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),#8c7dff);color:#fff}
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(107,92,255,.2)}
    .btn-ghost{background:#fff;color:#334155;border-color:var(--line)}
    .btn-ghost:hover{border-color:#cfd6ec;background:#fbfcff}
    .nav-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;width:44px;height:44px;align-items:center;justify-content:center}
    .nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{display:block;width:18px;height:2px;background:#334155;border-radius:2px;position:relative;transition:.2s}
    .nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0}
    .nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}
    .hero{padding:38px 0 18px}
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch
    }
    .hero-card{
      position:relative;overflow:hidden;border-radius:30px;background:
      linear-gradient(135deg, rgba(255,255,255,.92), rgba(247,249,255,.88));
      border:1px solid rgba(221,227,244,.9);box-shadow:var(--shadow);padding:34px;
    }
    .hero-card::before,.hero-card::after{
      content:"";position:absolute;border-radius:999px;pointer-events:none
    }
    .hero-card::before{right:-60px;top:-40px;width:220px;height:220px;background:radial-gradient(circle, rgba(107,92,255,.18), transparent 60%)}
    .hero-card::after{left:-42px;bottom:-44px;width:180px;height:180px;background:radial-gradient(circle, rgba(20,184,166,.14), transparent 60%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(107,92,255,.08);color:#3a35a8;font-size:13px;font-weight:700}
    h1{font-size:clamp(34px,5vw,58px);line-height:1.05;margin:18px 0 14px;letter-spacing:-.8px}
    .lead{font-size:17px;line-height:1.8;color:var(--muted);max-width:62ch;margin:0}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-note{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;color:#374151;font-size:13px}
    .pill{padding:8px 12px;border-radius:999px;background:#f3f6ff;border:1px solid #e3e8fb}
    .visual-card{
      border-radius:30px;background:linear-gradient(160deg,#131a33,#222d56 56%,#31458a);
      color:#f8fbff;padding:28px;box-shadow:var(--shadow);position:relative;overflow:hidden
    }
    .visual-card::before{
      content:"";position:absolute;inset:-20% -20% auto auto;width:260px;height:260px;border-radius:50%;
      background:radial-gradient(circle, rgba(255,255,255,.18), transparent 68%)
    }
    .metric-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:18px}
    .metric{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:16px}
    .metric strong{display:block;font-size:26px;line-height:1.1}
    .metric span{display:block;font-size:12px;color:rgba(248,251,255,.78);margin-top:6px}
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}
    .section-head h2{margin:0;font-size:28px;line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:58ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{
      background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
      box-shadow:var(--shadow-soft);padding:22px;transition:.25s
    }
    .card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .stat{display:flex;flex-direction:column;gap:8px}
    .stat strong{font-size:30px}
    .stat small{color:var(--muted)}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid #e6e9f4;color:#334155;font-size:13px}
    .panel-soft{background:linear-gradient(180deg,#fff,#fafbff);border:1px solid var(--line);border-radius:26px;padding:22px;box-shadow:var(--shadow-soft)}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:grid;grid-template-columns:92px 1fr;gap:14px;align-items:start}
    .timeline-item .year{font-weight:800;color:#4b45d7}
    .timeline-item .desc{color:var(--muted);line-height:1.75}
    .table-wrap{overflow-x:auto;border-radius:22px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow-soft)}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf0f6;text-align:left;vertical-align:top}
    th{background:#f8faff;color:#22304a;font-size:14px}
    td{color:#425066;line-height:1.7}
    .rating{
      display:flex;align-items:center;gap:10px;font-weight:700;color:#1f2937
    }
    .stars{color:#f59e0b;letter-spacing:2px;font-size:18px}
    details{
      background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:var(--shadow-soft)
    }
    details+details{margin-top:12px}
    summary{cursor:pointer;font-weight:700;color:#1f2937;list-style:none}
    summary::-webkit-details-marker{display:none}
    details p{margin:12px 0 0;color:var(--muted);line-height:1.75}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
    .avatar{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#6b5cff,#14b8a6);color:#fff;font-weight:800}
    .muted{color:var(--muted)}
    .case-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .case{display:flex;flex-direction:column;gap:12px}
    .case .chipline{display:flex;flex-wrap:wrap;gap:8px}
    .chip{padding:6px 10px;border-radius:999px;background:#f2f5ff;color:#334155;font-size:12px}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article-list a{display:block}
    .article-meta{font-size:12px;color:var(--muted);margin-top:8px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700;color:#243145}
    input,select,textarea{
      width:100%;border:1px solid #dbe2f0;border-radius:14px;background:#fff;color:#162033;
      padding:13px 14px;font:inherit;outline:none;transition:.2s
    }
    textarea{min-height:118px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8a7dfd;box-shadow:0 0 0 4px rgba(107,92,255,.12)}
    .full{grid-column:1/-1}
    .footer{
      margin-top:16px;padding:24px 0 28px;border-top:1px solid #e2e7f3;background:#f6f8fd;color:#243145
    }
    .footer-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;align-items:start}
    .footer a{color:#253b8f}
    .footer small{color:#5c6780;line-height:1.7}
    .float-box{
      position:fixed;right:16px;bottom:16px;z-index:50;display:flex;flex-direction:column;gap:10px
    }
    .float-btn{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-soft)}
    .backtop{opacity:0;pointer-events:none;transform:translateY(8px);transition:.25s}
    .backtop.show{opacity:1;pointer-events:auto;transform:none}
    .animate{opacity:0;transform:translateY(18px);transition:.6s ease}
    .animate.show{opacity:1;transform:none}
    .mobile-only{display:none}
    .hero-image-row{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:18px}
    .hero-image-row .ai-page-image{border-radius:18px;min-height:0;aspect-ratio:16/10;object-fit:cover}
    @media (max-width: 1024px){
      .hero-grid,.grid-3,.reviews,.article-list,.case-list,.footer-grid{grid-template-columns:1fr}
      .grid-2{grid-template-columns:1fr}
      .section-head{align-items:start;flex-direction:column}
    }
    @media (max-width: 760px){
      .menu{display:none}
      .nav-toggle{display:inline-flex}
      .nav-actions .btn-ghost{display:none}
      .hero-card,.visual-card{padding:22px;border-radius:24px}
      .form-grid{grid-template-columns:1fr}
      .metric-grid{grid-template-columns:1fr 1fr}
      .timeline-item{grid-template-columns:1fr}
      .mobile-only{display:block}
      .desktop-only{display:none}
    }
    .nav-open .menu{
      display:flex;flex-direction:column;align-items:flex-start;gap:8px;
      position:absolute;left:16px;right:16px;top:70px;padding:14px;background:#fff;border:1px solid var(--line);
      border-radius:18px;box-shadow:var(--shadow)
    }