:root{
      --bg:#f6f7fb;
      --bg2:#fffaf2;
      --card:#ffffff;
      --text:#1c2430;
      --muted:#5f6b7a;
      --line:#e6eaf0;
      --brand:#4b67ff;
      --brand2:#8a5cff;
      --accent:#ff8b5c;
      --shadow:0 18px 50px rgba(23, 34, 66, .08);
      --radius:20px;
      --radius2:28px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family: -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(75,103,255,.12), transparent 28%),
        radial-gradient(circle at top right, rgba(138,92,255,.10), transparent 24%),
        linear-gradient(180deg, #fbfcff 0%, var(--bg) 42%, #fff 100%);
      min-height:100vh;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    .site-header{
      position:sticky; top:0; z-index:60;
      backdrop-filter: blur(14px);
      background: rgba(255,255,255,.78);
      border-bottom:1px solid rgba(230,234,240,.8);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:16px;
      padding:12px 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 24px rgba(0,0,0,.06)}
    .brand-text{min-width:0}
    .brand-text strong{display:block; font-size:18px; letter-spacing:.5px}
    .brand-text span{display:block; font-size:12px; color:var(--muted)}
    .nav-toggle{display:none; border:1px solid var(--line); background:#fff; color:var(--text); border-radius:12px; padding:10px 12px}
    .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)}
    .nav-links a:hover{color:var(--brand)}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      border:none; border-radius:14px; padding:12px 18px;
      font-weight:700; cursor:pointer; transition:.22s ease;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff; box-shadow:0 14px 30px rgba(75,103,255,.22)}
    .btn-ghost{background:#fff; color:var(--text); border:1px solid var(--line)}
    .btn:hover{transform:translateY(-2px); box-shadow:0 18px 34px rgba(32,44,82,.12)}
    .hero{padding:34px 0 18px}
    .hero-grid{
      display:grid; grid-template-columns:1.2fr .8fr; gap:20px; align-items:stretch;
    }
    .hero-main{
      position:relative; overflow:hidden;
      background:
        linear-gradient(135deg, rgba(75,103,255,.10), rgba(138,92,255,.08) 55%, rgba(255,139,92,.10)),
        linear-gradient(180deg,#fff,#fbfcff);
      border:1px solid rgba(230,234,240,.9);
      border-radius:var(--radius2); box-shadow:var(--shadow);
      padding:34px;
    }
    .hero-main::before,.hero-main::after{
      content:""; position:absolute; border-radius:50%; pointer-events:none;
      filter: blur(10px); opacity:.65;
    }
    .hero-main::before{width:160px;height:160px;right:-40px;top:-40px;background:rgba(75,103,255,.14)}
    .hero-main::after{width:220px;height:220px;left:-80px;bottom:-90px;background:rgba(255,139,92,.12)}
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px; padding:8px 12px;
      border-radius:999px; background:rgba(75,103,255,.08); color:var(--brand); font-size:13px; font-weight:700;
    }
    h1{margin:16px 0 14px; font-size:clamp(30px,5vw,54px); line-height:1.06}
    .hero p{margin:0; color:var(--muted); line-height:1.8; max-width:60ch}
    .hero-actions{display:flex; gap:12px; flex-wrap:wrap; margin:22px 0 20px}
    .hero-points{
      display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:12px;
      margin-top:18px;
    }
    .mini-stat{
      background:rgba(255,255,255,.78); border:1px solid rgba(230,234,240,.95);
      border-radius:18px; padding:14px 14px 12px;
    }
    .mini-stat strong{display:block; font-size:20px}
    .mini-stat span{display:block; margin-top:6px; color:var(--muted); font-size:13px; line-height:1.5}
    .hero-side{
      display:grid; gap:14px;
    }
    .side-card{
      background:rgba(255,255,255,.9); border:1px solid rgba(230,234,240,.95);
      border-radius:var(--radius); box-shadow:var(--shadow); padding:18px;
    }
    .side-card h2,.section-title h2{margin:0 0 10px; font-size:22px}
    .side-card p,.section-title p{margin:0; color:var(--muted); line-height:1.7}
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px; margin-top:14px}
    .tag{padding:8px 12px; border-radius:999px; background:#f4f7ff; color:#2c3f8f; font-size:13px; border:1px solid #dfe6ff}
    .section{padding:22px 0}
    .section-title{display:flex; justify-content:space-between; align-items:flex-end; gap:18px; margin-bottom:16px}
    .section-title small{color:var(--brand); font-weight:700}
    .grid-4{display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:14px}
    .grid-3{display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:14px}
    .card{
      background:var(--card); border:1px solid var(--line); border-radius:18px; padding:18px;
      box-shadow:0 10px 30px rgba(22,31,54,.05); transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }
    .card:hover{transform:translateY(-4px); box-shadow:0 18px 42px rgba(22,31,54,.09); border-color:#d7def0}
    .metric strong{display:block; font-size:26px; margin-bottom:6px}
    .metric span{color:var(--muted); font-size:14px; line-height:1.6}
    .services .card h3,.case .card h3,.reviews .card h3,.articles .card h3{margin:0 0 10px; font-size:18px}
    .services .card p,.case .card p,.reviews .card p,.articles .card p{margin:0; color:var(--muted); line-height:1.75}
    .flow{display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:14px}
    .step{
      position:relative; padding-top:20px;
    }
    .step::before{
      content:attr(data-step); position:absolute; top:0; left:18px;
      width:34px; height:34px; border-radius:50%; display:grid; place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff; font-weight:800;
      box-shadow:0 10px 20px rgba(75,103,255,.22);
    }
    .step h3{margin:18px 0 10px}
    .compare-wrap{overflow:auto; border:1px solid var(--line); border-radius:18px; background:#fff; box-shadow:var(--shadow)}
    table{width:100%; border-collapse:collapse; min-width:760px}
    th,td{padding:14px 16px; border-bottom:1px solid var(--line); text-align:left; vertical-align:top}
    th{background:#f8faff; color:#24324a}
    td{color:var(--text)}
    tr:last-child td{border-bottom:none}
    .highlight{color:#1f4cff; font-weight:800}
    .rating{display:flex; gap:8px; align-items:center; flex-wrap:wrap}
    .star{color:#ffb200}
    .dual{
      display:grid; grid-template-columns:1fr 1fr; gap:14px;
    }
    .kpi-list{display:grid; gap:12px}
    .kpi-item{display:flex; justify-content:space-between; gap:10px; padding:14px 16px; border-radius:16px; background:#f9fbff; border:1px solid #e7ecf7}
    .kpi-item strong{color:var(--text)}
    .form{
      display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px;
    }
    .form .full{grid-column:1/-1}
    input,select,textarea{
      width:100%; border:1px solid var(--line); background:#fff; color:var(--text);
      border-radius:14px; padding:13px 14px; font:inherit; outline:none;
    }
    textarea{min-height:130px; resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#9badff; box-shadow:0 0 0 4px rgba(75,103,255,.08)}
    .faq{display:grid; gap:12px}
    details{
      background:#fff; border:1px solid var(--line); border-radius:16px; box-shadow:0 10px 24px rgba(22,31,54,.04);
      overflow:hidden;
    }
    summary{
      list-style:none; cursor:pointer; padding:16px 18px; font-weight:700; display:flex; align-items:center; justify-content:space-between; gap:14px;
    }
    summary::-webkit-details-marker{display:none}
    details p{margin:0; padding:0 18px 16px; color:var(--muted); line-height:1.75}
    .footer{
      margin-top:26px; padding:24px 0 30px; background:#fff; border-top:1px solid var(--line); color:var(--text)
    }
    .footer a{color:#2946d1}
    .footer-grid{display:grid; grid-template-columns:1.1fr .9fr .9fr; gap:18px}
    .footer small,.footer p{color:var(--muted)}
    .fixed-tools{
      position:fixed; right:16px; bottom:16px; display:grid; gap:10px; z-index:70;
    }
    .tool{
      width:48px; height:48px; border-radius:14px; display:grid; place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff; box-shadow:0 16px 28px rgba(75,103,255,.26)
    }
    .tool.secondary{background:#fff; color:var(--text); border:1px solid var(--line)}
    .floating-card{
      position:fixed; left:16px; bottom:16px; z-index:70; background:#fff; border:1px solid var(--line);
      border-radius:18px; box-shadow:var(--shadow); padding:14px; width:220px; display:none;
    }
    .floating-card img{border-radius:12px; margin-bottom:10px}
    .muted{color:var(--muted)}
    .article-list{display:grid; gap:12px}
    .article-item{display:flex; justify-content:space-between; gap:12px; padding:14px 16px; border:1px solid var(--line); border-radius:16px; background:#fff}
    .article-item span{color:var(--muted); white-space:nowrap}
    .banner-row{display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:12px}
    .banner-row img{border-radius:16px; border:1px solid var(--line); object-fit:cover; aspect-ratio: 4 / 3; background:#f3f6fb}
    .inline-images{display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px}
    .inline-images img{border-radius:18px; border:1px solid var(--line); object-fit:cover; aspect-ratio: 16 / 9; background:#f3f6fb}
    .ai-page-home-link{font-weight:700}
    @media (max-width: 980px){
      .hero-grid,.grid-4,.grid-3,.flow,.dual,.footer-grid,.banner-row{grid-template-columns:1fr 1fr}
      .hero-main{padding:24px}
      .form{grid-template-columns:1fr}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      .nav-links{
        display:none; position:absolute; left:16px; right:16px; top:68px;
        background:#fff; border:1px solid var(--line); border-radius:18px; padding:14px;
        box-shadow:var(--shadow); flex-direction:column; align-items:flex-start;
      }
      .nav-links.open{display:flex}
      .hero-grid,.grid-4,.grid-3,.flow,.dual,.footer-grid,.banner-row,.inline-images{grid-template-columns:1fr}
      .hero-points{grid-template-columns:1fr}
      .section-title{flex-direction:column; align-items:flex-start}
      .floating-card{display:none}
    }
    .reveal{opacity:0; transform:translateY(16px); transition:.6s ease}
    .reveal.in{opacity:1; transform:none}