:root{
      --bg:#f6f4ef;
      --bg2:#eef3ff;
      --card:#ffffff;
      --text:#172033;
      --muted:#5a657c;
      --line:#dbe2ef;
      --accent:#6a5cff;
      --accent2:#16b8a6;
      --warm:#ff8d6d;
      --shadow:0 18px 50px rgba(22,34,66,.08);
      --radius:22px;
      --max:1200px;
    }
    *{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(106,92,255,.10), transparent 28%),
        radial-gradient(circle at top right, rgba(22,184,166,.10), transparent 24%),
        linear-gradient(180deg,#fff 0%, var(--bg) 42%, #f7f9ff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(255,255,255,.72);
      border-bottom:1px solid rgba(219,226,239,.7);
    }
    .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}
    .ai-page-logo{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;box-shadow:0 6px 20px rgba(0,0,0,.06)}
    .brand strong{display:block;font-size:18px;line-height:1.2}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#334059;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover,.nav-links a.active{background:#eef2ff;color:#3327b6}
    .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;transition:.25s;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--accent),#8e7dff);color:#fff;box-shadow:0 12px 26px rgba(106,92,255,.25)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(106,92,255,.3)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    .hero{padding:42px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.panel,.card,.faq-item,.review,.article,.timeline li,.compare,.form-box,.info-box{
      background:rgba(255,255,255,.82);border:1px solid rgba(219,226,239,.9);box-shadow:var(--shadow);border-radius:var(--radius)
    }
    .hero-main{padding:30px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{
      content:"";position:absolute;border-radius:50%;pointer-events:none;filter:blur(10px)
    }
    .hero-main:before{width:220px;height:220px;right:-70px;top:-70px;background:radial-gradient(circle, rgba(106,92,255,.22), transparent 62%)}
    .hero-main:after{width:180px;height:180px;left:-60px;bottom:-70px;background:radial-gradient(circle, rgba(22,184,166,.20), transparent 60%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,rgba(106,92,255,.12),rgba(22,184,166,.12));color:#2d3c63;border:1px solid rgba(106,92,255,.14);padding:8px 12px;border-radius:999px;font-size:13px;font-weight:700}
    h1{font-size:clamp(30px,5vw,54px);line-height:1.08;margin:16px 0 14px;letter-spacing:-.02em}
    .lead{font-size:16px;line-height:1.8;color:var(--muted);max-width:56ch;margin:0 0 20px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 20px}
    .hero-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
    .stat{padding:16px;border-radius:18px;background:linear-gradient(180deg,#fff, #f8fbff);border:1px solid var(--line)}
    .stat strong{display:block;font-size:24px;margin-bottom:4px}
    .stat span{display:block;font-size:13px;color:var(--muted);line-height:1.5}
    .hero-side{padding:22px;display:flex;flex-direction:column;gap:16px}
    .mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .mini{padding:16px;border-radius:18px;background:linear-gradient(145deg,#f7f9ff,#fff);border:1px solid var(--line)}
    .mini h3{margin:0 0 8px;font-size:15px}
    .mini p{margin:0;color:var(--muted);font-size:13px;line-height:1.7}
    section{padding:18px 0}
    .section-head{display:flex;justify-content:space-between;gap:16px;align-items:end;margin-bottom:14px}
    .section-head h2{margin:0;font-size:clamp(22px,3vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.7}
    .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,.faq-item,.panel,.timeline li,.compare,.form-box,.info-box{padding:20px}
    .card h3,.panel h3,.review h3,.article h3{margin:0 0 10px;font-size:18px}
    .card p,.panel p,.review p,.article p,.info-box p{margin:0;color:var(--muted);line-height:1.75}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#f2f5ff;border:1px solid #d8dff4;font-size:13px;color:#334;}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .timeline{list-style:none;margin:0;padding:0;display:grid;gap:12px}
    .timeline li{position:relative;padding-left:18px}
    .timeline li:before{content:"";position:absolute;left:10px;top:22px;bottom:-12px;width:2px;background:linear-gradient(180deg,var(--accent),transparent)}
    .timeline li:last-child:before{display:none}
    .timeline strong{display:block;margin-bottom:6px}
    .table-wrap{overflow:auto;border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf1f7;text-align:left;font-size:14px}
    th{background:#f7f9ff;color:#24304a}
    tr:hover td{background:#fbfcff}
    .rating{display:inline-flex;gap:4px;color:#f2b01e;font-size:18px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;padding:18px 20px;border:0;background:none;color:var(--text);font-size:16px;font-weight:700;text-align:left;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .32s ease;padding:0 20px;color:var(--muted)}
    .faq-item.open .faq-a{max-height:200px;padding-bottom:18px}
    .faq-item.open .faq-q .chev{transform:rotate(180deg)}
    .chev{transition:.25s}
    .reviews,.articles,.faq-list,.cases{display:grid;gap:16px}
    .reviews{grid-template-columns:repeat(3,minmax(0,1fr))}
    .articles{grid-template-columns:repeat(3,minmax(0,1fr))}
    .meta{display:flex;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--muted);margin-top:12px}
    .pill{display:inline-flex;align-items:center;border-radius:999px;padding:6px 10px;background:#f5f7ff;border:1px solid #e1e6fb;color:#3b4a72}
    .form-box form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    .field.full{grid-column:1/-1}
    label{font-size:14px;font-weight:700}
    input,select,textarea{
      width:100%;border:1px solid #d8deea;background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);outline:none
    }
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#9aa7ff;box-shadow:0 0 0 4px rgba(106,92,255,.12)}
    footer{margin-top:18px;background:#11182a;color:#e8ecff}
    footer .container{padding:26px 0}
    footer a{color:#cdd7ff}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr .9fr;gap:16px;align-items:start}
    .footer-grid p,.footer-grid li{color:#c6cee6;line-height:1.8}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:7px 10px;border-radius:999px;background:rgba(255,255,255,.06)}
    .fixed-tools{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:10px;z-index:60}
    .tool{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:#fff;border:1px solid var(--line);box-shadow:0 12px 30px rgba(0,0,0,.12)}
    .sidebar-float{
      position:fixed;left:16px;bottom:16px;z-index:60;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 16px 40px rgba(0,0,0,.1);overflow:hidden;width:min(320px,calc(100vw - 32px))
    }
    .sidebar-float header{position:static;background:linear-gradient(135deg,#eff2ff,#f7fff9);border:0}
    .sidebar-float .inner{padding:14px 16px;display:grid;gap:12px}
    .qrcode{display:flex;gap:12px;align-items:center}
    .qrcode img{width:84px;height:84px;object-fit:cover;border-radius:14px;border:1px solid var(--line)}
    .toggle-mobile{display:none}
    .scroll-reveal{opacity:0;transform:translateY(14px);transition:.5s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    .image-card{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .image-card img{width:100%;border-radius:18px;border:1px solid var(--line);box-shadow:0 10px 26px rgba(0,0,0,.08)}
    @media (max-width: 1024px){
      .hero-grid,.split,.footer-grid,.grid-4,.reviews,.articles,.grid-3,.form-box form,.hero-stats,.image-card{grid-template-columns:1fr 1fr}
      .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
      .reviews,.articles,.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width: 780px){
      .nav-links,.nav-cta{display:none}
      .menu-toggle{display:inline-flex}
      .toggle-mobile{display:block}
      .hero-grid,.split,.footer-grid,.grid-4,.reviews,.articles,.grid-3,.form-box form,.hero-stats,.image-card,.mini-grid{grid-template-columns:1fr}
      .hero-main,.hero-side{padding:20px}
      .section-head{flex-direction:column;align-items:start}
      .sidebar-float{display:none}
      .fixed-tools{right:12px;bottom:12px}
      .mobile-nav{
        display:none;padding:0 0 16px
      }
      .mobile-nav.open{display:block}
      .mobile-nav .nav-links{display:flex;flex-direction:column;align-items:stretch;padding:12px 0}
      .mobile-nav .nav-links a{background:#fff;border:1px solid var(--line)}
      .mobile-nav .nav-cta{display:flex;flex-direction:column;align-items:stretch}
      .mobile-nav .nav-cta .btn{width:100%}
    }