:root{
      --bg:#f6f8ff;
      --bg2:#eef3ff;
      --card:#ffffff;
      --line:#dbe5ff;
      --text:#162033;
      --muted:#5a6680;
      --primary:#5b5ef7;
      --primary2:#00b7ff;
      --accent:#8a5cff;
      --green:#16b57a;
      --shadow:0 18px 45px rgba(36,57,120,.12);
      --radius:22px;
      --radius2:16px;
      --container: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(91,94,247,.11), transparent 28%),
        radial-gradient(circle at top right, rgba(0,183,255,.10), transparent 22%),
        linear-gradient(180deg, #f8fbff 0%, #f6f8ff 36%, #f4f7ff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(246,248,255,.8);
      border-bottom:1px solid rgba(219,229,255,.75);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:16px;
      min-height:74px;padding:10px 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:4px;border:1px solid var(--line);box-shadow:0 10px 24px rgba(40,60,120,.08)}
    .brand h1{font-size:18px;line-height:1.1;margin:0;font-weight:800;letter-spacing:.2px}
    .brand .sub{display:block;font-size:12px;color:var(--muted);font-weight:600;margin-top:4px}
    .menu{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .menu a{font-size:14px;color:var(--muted);font-weight:700}
    .menu a:hover{color:var(--primary)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:12px 16px;border-radius:999px;border:1px solid transparent;
      font-weight:800;font-size:14px;transition:.25s ease;cursor:pointer;
      box-shadow:0 10px 24px rgba(36,57,120,.10);
    }
    .btn-primary{color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2))}
    .btn-ghost{background:#fff;color:var(--text);border-color:var(--line)}
    .btn:hover{transform:translateY(-2px);box-shadow:0 18px 28px rgba(36,57,120,.16)}
    .menu-toggle{display:none}
    .hero{padding:38px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch}
    .hero-main{
      position:relative;overflow:hidden;border-radius:30px;padding:34px;
      background:
        linear-gradient(135deg, rgba(88,92,244,.12), rgba(0,183,255,.08)),
        linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.84));
      border:1px solid rgba(219,229,255,.95);box-shadow:var(--shadow);
    }
    .hero-main:before,.hero-main:after{
      content:"";position:absolute;border-radius:50%;pointer-events:none;
      background:radial-gradient(circle, rgba(91,94,247,.22), transparent 64%);
      filter:blur(4px)
    }
    .hero-main:before{width:220px;height:220px;right:-60px;top:-50px}
    .hero-main:after{width:180px;height:180px;left:-40px;bottom:-70px;background:radial-gradient(circle, rgba(0,183,255,.16), transparent 64%)}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;
      background:rgba(91,94,247,.08);color:var(--primary);font-weight:800;font-size:13px;border:1px solid rgba(91,94,247,.12)
    }
    .hero h2{margin:18px 0 12px;font-size:clamp(34px,5vw,56px);line-height:1.06}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}
    .point{
      padding:14px 14px 13px;border-radius:18px;background:rgba(255,255,255,.72);
      border:1px solid rgba(219,229,255,.9)
    }
    .point strong{display:block;font-size:18px;margin-bottom:6px}
    .point span{display:block;color:var(--muted);font-size:13px;line-height:1.6}
    .hero-side{display:grid;gap:14px}
    .mini-card{
      padding:22px;border-radius:24px;background:rgba(255,255,255,.9);border:1px solid var(--line);box-shadow:var(--shadow)
    }
    .mini-card h3{margin:0 0 10px;font-size:18px}
    .mini-card p,.mini-card li{color:var(--muted);line-height:1.7;font-size:14px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#f4f7ff;border:1px solid var(--line);font-size:13px;font-weight:700;color:#34415d}
    section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);line-height:1.7;max-width:70ch}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .card{
      background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:var(--radius);
      box-shadow:var(--shadow);padding:22px;transition:.25s ease
    }
    .card:hover{transform:translateY(-3px);box-shadow:0 22px 50px rgba(36,57,120,.15)}
    .metric .num{font-size:30px;font-weight:900;letter-spacing:-.5px}
    .metric .lab{margin-top:6px;font-size:14px;color:var(--muted);line-height:1.6}
    .metric .hint{margin-top:10px;font-size:12px;color:#6d7690}
    .icon{
      width:42px;height:42px;border-radius:14px;display:grid;place-items:center;margin-bottom:14px;
      background:linear-gradient(135deg,rgba(91,94,247,.12),rgba(0,183,255,.12));color:var(--primary);font-weight:900
    }
    .card h3{margin:0 0 10px;font-size:18px}
    .card p{margin:0;color:var(--muted);line-height:1.75;font-size:14px}
    .steps{counter-reset:s}
    .step{position:relative;padding-top:22px}
    .step:before{
      counter-increment:s;content:"0" counter(s);
      position:absolute;top:18px;right:18px;font-size:13px;font-weight:900;color:rgba(91,94,247,.22)
    }
    .table-wrap{overflow-x:auto;border-radius:22px;border:1px solid var(--line);box-shadow:var(--shadow);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf2ff;text-align:left;font-size:14px;vertical-align:top}
    th{background:#f7f9ff;color:#28314a;font-size:13px;text-transform:none}
    td{color:var(--muted)}
    .badge{
      display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;
      background:rgba(22,181,122,.1);color:var(--green);font-weight:800;font-size:12px
    }
    .faq details{
      background:#fff;border:1px solid var(--line);border-radius:18px;padding:0 18px;box-shadow:var(--shadow)
    }
    .faq details+details{margin-top:12px}
    .faq summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:800}
    .faq summary::-webkit-details-marker{display:none}
    .faq .ans{padding:0 0 16px;color:var(--muted);line-height:1.8}
    .reviews .card{height:100%}
    .quote{font-size:14px;line-height:1.8;color:var(--muted)}
    .author{margin-top:14px;font-weight:900}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:13px;font-weight:800;color:#30405f}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid #d9e2fb;background:#fbfcff;
      color:var(--text);font:inherit;outline:none;transition:.2s ease
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(91,94,247,.6);box-shadow:0 0 0 4px rgba(91,94,247,.08)}
    textarea{min-height:124px;resize:vertical}
    .footer{
      padding:26px 0 30px;margin-top:10px;border-top:1px solid rgba(219,229,255,.92);
      background:linear-gradient(180deg, rgba(246,248,255,.2), rgba(241,245,255,.88));
      color:var(--text)
    }
    .footer a{color:#33406a}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .8fr;gap:16px}
    .footer small{color:var(--muted);line-height:1.8}
    .foot-links{display:flex;flex-wrap:wrap;gap:10px}
    .floating{
      position:fixed;right:16px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      width:54px;height:54px;border-radius:18px;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 18px 34px rgba(91,94,247,.35)
    }
    .float-kf{
      position:fixed;left:16px;bottom:18px;z-index:60;max-width:300px;
      background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);overflow:hidden
    }
    .float-kf h4{margin:0;padding:14px 16px;background:#f7f9ff;font-size:14px}
    .float-kf .body{padding:14px 16px;display:grid;gap:10px}
    .float-kf .body p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}
    .float-kf .ai-page-image{width:120px;height:auto;border-radius:14px;border:1px solid var(--line)}
    .scroll-top{cursor:pointer}
    .fade-in{opacity:0;transform:translateY(16px);transition:.6s ease}
    .fade-in.visible{opacity:1;transform:none}
    .two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .list{display:grid;gap:10px;margin:0;padding:0;list-style:none}
    .list li{padding:12px 14px;border-radius:14px;background:#f8faff;border:1px solid #e6ebff;color:#3b4660;line-height:1.65}
    .article-list{display:grid;gap:12px}
    .article-item{padding:14px 16px;border-radius:16px;background:#fff;border:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;align-items:center}
    .article-item span{color:var(--muted);font-size:13px}
    .timeline{display:grid;gap:12px}
    .timeline .t{display:grid;grid-template-columns:90px 1fr;gap:12px;align-items:start}
    .timeline .date{font-weight:900;color:var(--primary)}
    .chips{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:10px 12px;border-radius:12px;background:#f6f8ff;border:1px solid var(--line);font-size:13px;color:#36415f;font-weight:700}
    @media (max-width: 980px){
      .hero-grid,.footer-grid,.grid-4,.grid-3,.two-col,.form-grid{grid-template-columns:1fr}
      .menu{display:none;position:absolute;left:16px;right:16px;top:76px;background:#fff;padding:14px;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
      .menu.open{display:flex;flex-direction:column;align-items:flex-start}
      .menu-toggle{display:inline-flex}
      .nav{position:relative}
      .hero-points{grid-template-columns:1fr}
      .float-kf{display:none}
    }