:root{
      --bg:#f6f7fb;
      --bg2:#eef2ff;
      --card:#ffffff;
      --text:#172033;
      --muted:#5d667d;
      --line:rgba(37,52,92,.12);
      --accent:#4d6bff;
      --accent2:#8b5cf6;
      --accent3:#10b981;
      --shadow:0 18px 50px rgba(19,30,63,.10);
      --radius:22px;
      --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;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(77,107,255,.14), transparent 30%),
        radial-gradient(circle at top right, rgba(139,92,246,.12), transparent 24%),
        linear-gradient(180deg,#fbfcff 0%, #f3f6ff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    header,main,footer{position:relative}
    .topbar{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(246,247,251,.82);
      border-bottom:1px solid rgba(37,52,92,.08);
    }
    .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;box-shadow:0 8px 20px rgba(0,0,0,.08)}
    .brand h2{margin:0;font-size:18px;line-height:1.1}
    .brand p{margin:4px 0 0;color:var(--muted);font-size:12px}
    .nav-actions{display:flex;align-items:center;gap:10px;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;font-weight:700
    }
    .nav-links{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
    .nav-links a{color:var(--muted);font-size:14px;font-weight:600;padding:8px 10px;border-radius:12px}
    .nav-links a:hover{background:rgba(77,107,255,.08);color:var(--text)}
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch;
    }
    .hero-panel{
      position:relative;overflow:hidden;background:
        linear-gradient(135deg, rgba(77,107,255,.12), rgba(139,92,246,.08) 48%, rgba(16,185,129,.08));
      border:1px solid rgba(77,107,255,.12);
      border-radius:30px;padding:30px;box-shadow:var(--shadow);
    }
    .hero-panel::before,.hero-panel::after{
      content:"";position:absolute;border-radius:999px;filter:blur(2px);pointer-events:none
    }
    .hero-panel::before{width:220px;height:220px;background:radial-gradient(circle, rgba(77,107,255,.24), transparent 70%);right:-70px;top:-50px}
    .hero-panel::after{width:180px;height:180px;background:radial-gradient(circle, rgba(139,92,246,.22), transparent 70%);left:-40px;bottom:-40px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.75);border:1px solid rgba(77,107,255,.12);color:#30406a;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.08;letter-spacing:-.02em}
    .hero-desc{margin:0;max-width:60ch;color:var(--muted);font-size:16px;line-height:1.8}
    .cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border-radius:16px;padding:13px 18px;font-weight:800;border:1px solid transparent;
      transition:transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .btn:hover{transform:translateY(-2px)}
    .btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;box-shadow:0 14px 30px rgba(77,107,255,.25)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .hero-metrics{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;
    }
    .metric,.card,.review,.step,.faq-item,.panel,.case,.article,.network,.compare{
      background:rgba(255,255,255,.88);border:1px solid var(--line);box-shadow:0 10px 28px rgba(26,40,80,.06)
    }
    .metric{border-radius:20px;padding:18px}
    .metric strong{display:block;font-size:28px;line-height:1.1}
    .metric span{display:block;margin-top:8px;color:var(--muted);font-size:13px;line-height:1.6}
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:clamp(22px,3vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.8}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .card,.review,.article,.case,.network,.panel{border-radius:24px;padding:20px}
    .card h3,.panel h3,.case h3,.article h3{margin:10px 0 10px;font-size:18px}
    .card p,.panel p,.case p,.article p,.review p{margin:0;color:var(--muted);line-height:1.75}
    .icon{
      width:46px;height:46px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(77,107,255,.14),rgba(139,92,246,.14));color:#3346a8;font-weight:900
    }
    .pill-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .pill{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#334; font-size:13px}
    .timeline{display:grid;gap:12px}
    .timeline .step{display:flex;gap:14px;align-items:flex-start;padding:18px;border-radius:20px}
    .step-num{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;display:grid;place-items:center;font-weight:900;flex:none}
    .table-wrap{overflow:auto;border-radius:24px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 14px;text-align:left;border-bottom:1px solid rgba(37,52,92,.08);vertical-align:top}
    th{background:linear-gradient(180deg, rgba(77,107,255,.08), rgba(255,255,255,1));font-size:14px}
    td{color:var(--muted);line-height:1.7}
    .score{color:#0f766e;font-weight:800}
    .faq-list{display:grid;gap:12px}
    .faq-item{border-radius:20px;overflow:hidden}
    .faq-q{
      width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;
      padding:18px 18px;background:transparent;border:0;color:var(--text);font-size:16px;font-weight:800;text-align:left
    }
    .faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease,padding .25s ease}
    .faq-a p{margin:0;padding:0 18px 18px;color:var(--muted);line-height:1.8}
    .faq-item.active .faq-a{max-height:220px}
    .faq-item.active .faq-a p{padding-top:0}
    .faq-item.active .chev{transform:rotate(180deg)}
    .chev{transition:transform .2s ease}
    .reviews,.cases,.articles,.network-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review .meta{display:flex;align-items:center;gap:12px;margin-bottom:12px}
    .avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#dce5ff,#f2dffc);display:grid;place-items:center;font-weight:900;color:#3b4b92}
    .stars{color:#f59e0b;font-size:15px;letter-spacing:2px}
    .article small,.case small{color:#6b7280;font-weight:700}
    .split{
      display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start
    }
    .form{
      display:grid;grid-template-columns:1fr 1fr;gap:14px
    }
    .field{display:flex;flex-direction:column;gap:8px}
    .field.full{grid-column:1/-1}
    label{font-size:13px;font-weight:800;color:#334}
    input,select,textarea{
      width:100%;border:1px solid rgba(37,52,92,.14);background:#fff;color:var(--text);
      border-radius:14px;padding:13px 14px;font:inherit;outline:none
    }
    textarea{min-height:128px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:rgba(77,107,255,.55);box-shadow:0 0 0 4px rgba(77,107,255,.10)}
    .footer{
      margin-top:18px;padding:22px 0 28px;background:linear-gradient(180deg, rgba(255,255,255,.72), rgba(243,246,255,.96));border-top:1px solid rgba(37,52,92,.08)
    }
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
    .muted{color:var(--muted)}
    .link-list{display:flex;flex-wrap:wrap;gap:10px}
    .link-list a{padding:8px 11px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#2f3b58}
    .fixed-tools{
      position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px
    }
    .tool{
      width:48px;height:48px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;box-shadow:0 12px 25px rgba(77,107,255,.28)
    }
    .float-card{
      position:fixed;left:16px;bottom:16px;z-index:60;width:min(320px, calc(100vw - 32px));
      background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:14px;display:flex;gap:12px;align-items:center
    }
    .float-card img{width:74px;height:74px;object-fit:cover;border-radius:16px;border:1px solid var(--line)}
    .float-card strong{display:block;margin-bottom:6px}
    .float-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}
    .scroll-reveal{opacity:0;transform:translateY(14px);transition:opacity .55s ease, transform .55s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    .ai-page-home-link{font-weight:800}
    .tagline{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
    .highlight{color:#2540c0;font-weight:900}
    .mini-note{font-size:13px;color:var(--muted);margin-top:10px}
    @media (max-width: 980px){
      .hero-grid,.split,.footer-grid,.grid-4,.grid-3,.reviews,.cases,.articles,.network-grid{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 720px){
      .menu-btn{display:inline-flex}
      .nav-links{display:none;width:100%;padding-top:10px}
      .nav-links.open{display:flex;flex-direction:column;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px}
      .nav{flex-wrap:wrap}
      .hero-grid,.split,.footer-grid,.grid-4,.grid-3,.reviews,.cases,.articles,.network-grid,.hero-metrics,.form{grid-template-columns:1fr}
      .hero-panel{padding:22px}
      .float-card{display:none}
    }