:root{--bg:#f6f8fc;--panel:#ffffff;--panel2:#f2f6ff;--text:#1d2433;--muted:#5d687d;--brand:#2563eb;--brand2:#00b8d9;--line:#dbe4f3;--shadow:0 18px 40px rgba(20,37,90,.08);--radius:20px}
    *{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:radial-gradient(circle at top left,#eef4ff 0,#f7f9fd 35%,#f6f8fc 100%);color:var(--text)}
    a{color:var(--brand);text-decoration:none} img{display:block;max-width:100%}
    .container{width:min(1180px,calc(100% - 32px));margin:0 auto}
    header{position:sticky;top:0;z-index:40;background:rgba(246,248,252,.86);backdrop-filter:blur(12px);border-bottom:1px solid rgba(219,228,243,.85)}
    .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}
    .brand-text strong{display:block;font-size:16px;letter-spacing:.3px}
    .brand-text span{display:block;font-size:12px;color:var(--muted)}
    .menu{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .menu a{font-size:14px;color:var(--text);padding:8px 10px;border-radius:999px}
    .menu a:hover,.menu a:focus{background:#eaf1ff;color:#1142a4}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text)}
    .hero{padding:42px 0 24px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main{background:linear-gradient(135deg,#ffffff 0%,#f3f7ff 55%,#edf6ff 100%);border:1px solid rgba(219,228,243,.9);border-radius:28px;padding:32px;box-shadow:var(--shadow);position:relative;overflow:hidden}
    .hero-main::before,.hero-main::after{content:"";position:absolute;border-radius:50%;filter:blur(8px);pointer-events:none}
    .hero-main::before{width:180px;height:180px;background:rgba(37,99,235,.10);right:-40px;top:-30px}
    .hero-main::after{width:140px;height:140px;background:rgba(0,184,217,.10);left:-30px;bottom:-30px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#eaf2ff;color:#1241a1;border:1px solid #d8e6ff;padding:8px 12px;border-radius:999px;font-size:13px;font-weight:600}
    h1{margin:16px 0 12px;font-size:clamp(30px,5vw,52px);line-height:1.06;letter-spacing:-.02em}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:56ch}
    .cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:14px;padding:13px 18px;font-weight:700;cursor:pointer;transition:.25s ease;min-height:46px}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f46e5);color:#fff;box-shadow:0 12px 24px rgba(37,99,235,.22)}
    .btn-secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .btn:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(20,37,90,.12)}
    .hero-side{display:grid;gap:14px}
    .mini-card{background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:var(--shadow)}
    .mini-card h3{margin:0 0 8px;font-size:18px}
    .mini-card p,.mini-card li{color:var(--muted);line-height:1.7}
    .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:22px 0 10px}
    .stat{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:var(--shadow)}
    .stat b{display:block;font-size:28px;color:#0f172a}
    .stat span{display:block;margin-top:6px;font-size:13px;color:var(--muted)}
    section{padding:20px 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);max-width:64ch;line-height:1.7}
    .grid-3,.grid-4,.grid-2{display:grid;gap:16px}
    .grid-3{grid-template-columns:repeat(3,1fr)} .grid-4{grid-template-columns:repeat(4,1fr)} .grid-2{grid-template-columns:repeat(2,1fr)}
    .card{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow);transition:.25s ease}
    .card:hover{transform:translateY(-4px)}
    .card h3,.card h4{margin:0 0 10px}
    .card p,.card li{margin:0;color:var(--muted);line-height:1.8}
    .chip-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:9px 12px;border-radius:999px;background:#eef4ff;border:1px solid #dbe6ff;color:#1241a1;font-size:13px}
    .process{counter-reset:step}
    .step{position:relative;padding-left:54px}
    .step::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:0;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,#2563eb,#00b8d9);color:#fff;display:grid;place-items:center;font-weight:800}
    .table-wrap{overflow:auto;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:780px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2fb;text-align:left;vertical-align:top}
    th{background:#f5f8ff;color:#10213d}
    td{color:var(--muted)}
    details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:var(--shadow)}
    details+details{margin-top:12px}
    summary{cursor:pointer;font-weight:700;color:var(--text)}
    summary::-webkit-details-marker{display:none}
    .review{display:flex;flex-direction:column;gap:10px}
    .stars{color:#f59e0b;font-size:18px;letter-spacing:2px}
    .quote{font-size:15px;line-height:1.8;color:var(--muted)}
    .article-list{display:grid;gap:12px}
    .article-item{display:flex;justify-content:space-between;gap:14px;padding:15px 16px;border:1px solid var(--line);border-radius:16px;background:#fff}
    .article-item span{color:var(--muted);font-size:13px}
    .form{display:grid;grid-template-columns:repeat(2,1fr);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 #cad6ea;border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#7aa7ff;box-shadow:0 0 0 4px rgba(37,99,235,.10)}
    .footer-top{display:grid;grid-template-columns:1.2fr .8fr;gap:16px}
    footer{margin-top:10px;background:#0f172a;color:#d6def2}
    footer a{color:#9bd0ff}
    .footer-inner{padding:26px 0}
    .footer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .footer-card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:18px}
    .footer-card h3{margin:0 0 10px;color:#fff}
    .footer-card p,.footer-card li{color:#d6def2;line-height:1.8}
    .floating{position:fixed;right:16px;bottom:16px;z-index:50;display:grid;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,#2563eb,#00b8d9);color:#fff;display:grid;place-items:center;box-shadow:0 14px 28px rgba(37,99,235,.28);border:none;cursor:pointer}
    .service-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#fff7e8;border:1px solid #ffe0a6;color:#9a5b00;font-size:13px;font-weight:700}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .scroll-reveal.in{opacity:1;transform:none}
    .banner-img{border-radius:18px;border:1px solid var(--line);overflow:hidden}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-4,.grid-2,.stats,.footer-top,.footer-grid{grid-template-columns:1fr}
      .section-head,.nav{align-items:flex-start}
      .menu{display:none;width:100%;padding-top:10px}
      .menu.open{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
      .nav{flex-wrap:wrap}
      .nav-toggle{display:inline-flex}
      .form{grid-template-columns:1fr}
    }