:root{
      --bg:#f6f7fb;
      --panel:#ffffff;
      --panel2:#fbfcff;
      --text:#18202f;
      --muted:#5e6a7e;
      --line:#e6eaf2;
      --brand:#215cff;
      --brand2:#8d5bff;
      --accent:#13b8a6;
      --warm:#ffb84d;
      --shadow:0 14px 40px rgba(25,45,90,.09);
      --shadow2:0 10px 24px rgba(33,92,255,.12);
      --radius:22px;
      --radius2:16px;
      --container:1180px;
    }
    *{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(33,92,255,.12), transparent 28%),
      radial-gradient(circle at top right, rgba(141,91,255,.12), transparent 24%),
      linear-gradient(180deg, #f8faff 0%, #f5f7fb 36%, #f7f8fc 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;background:rgba(246,247,251,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(230,234,242,.8)}
    .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}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:6px;box-shadow:0 8px 18px rgba(0,0,0,.06)}
    .brand strong{display:block;font-size:16px;line-height:1.1}
    .brand span{display:block;font-size:12px;color:var(--muted);margin-top:4px}
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#304057;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover,.nav-links a.active{background:#eef3ff;color:var(--brand)}
    .nav-actions{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(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow2)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;width:44px;height:44px;align-items:center;justify-content:center}
    .menu-btn span,.menu-btn span:before,.menu-btn span:after{content:"";display:block;width:18px;height:2px;background:#334155;border-radius:2px;position:relative}
    .menu-btn span:before,.menu-btn span:after{position:absolute;left:0}
    .menu-btn span:before{top:-6px}.menu-btn span:after{top:6px}
    .hero{padding:38px 0 20px}
    .hero-wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.section-card,.quote-card,.faq-item,.form-card,.timeline-card,.compare-card,.pricing-card{background:rgba(255,255,255,.82);backdrop-filter:blur(8px);border:1px solid rgba(230,234,242,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-main{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eef6ff;color:#2757db;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.06;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8}
    .hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 20px}
    .hero-meta{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:9px 12px;border-radius:999px;background:#f4f7ff;border:1px solid #e6ecff;color:#334155;font-size:13px}
    .hero-side{padding:24px;display:grid;gap:14px;align-content:start}
    .mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .metric{padding:16px;border-radius:18px;background:linear-gradient(180deg,#fff, #f8faff);border:1px solid var(--line)}
    .metric b{display:block;font-size:24px;color:var(--brand)}
    .metric span{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:14px}
    .section-head h2{margin:0;font-size:clamp(22px,3vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:720px;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .card{padding:20px;border-radius:20px;background:linear-gradient(180deg,#fff,#fbfcff);border:1px solid var(--line);box-shadow:0 8px 24px rgba(18,32,71,.05);transition:.25s}
    .card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
    .card h3{margin:0 0 8px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .card ul{margin:0;padding-left:18px}
    .section-card{padding:24px}
    .feature-badges{display:flex;flex-wrap:wrap;gap:10px}
    .badge{padding:8px 11px;border-radius:999px;background:#f2f6ff;border:1px solid #dbe5ff;font-size:13px;color:#2b3b58}
    .split{display:grid;grid-template-columns:1.05fr .95fr;gap:18px}
    .list-check{display:grid;gap:12px}
    .list-check div{padding:14px 15px;border:1px solid var(--line);border-radius:16px;background:#fff}
    .list-check strong{display:block;margin-bottom:4px}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:20px;background:linear-gradient(180deg,#fff,#f9fbff);border:1px solid var(--line);position:relative;overflow:hidden}
    .step:before{content:"";position:absolute;inset:auto -18px -18px auto;width:88px;height:88px;border-radius:50%;background:radial-gradient(circle, rgba(33,92,255,.14), transparent 68%)}
    .step b{display:inline-flex;width:32px;height:32px;border-radius:10px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;margin-bottom:10px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    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:#f7f9ff;color:#23324b;font-size:14px}
    td{color:#364255}
    .rating{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
    .rating .card{text-align:center}
    .rating .score{font-size:34px;font-weight:800;color:var(--brand)}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:block;font-size:14px;font-weight:700;margin-bottom:8px;color:#24324a}
    input,select,textarea{width:100%;padding:13px 14px;border-radius:14px;border:1px solid #dbe2ef;background:#fff;color:var(--text);outline:none;transition:.2s}
    textarea{min-height:128px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#9db5ff;box-shadow:0 0 0 4px rgba(33,92,255,.08)}
    .full{grid-column:1/-1}
    .faq{display:grid;gap:12px}
    .faq-item summary{list-style:none;cursor:pointer;padding:18px 18px 18px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary strong{font-size:16px}
    .faq-item .ans{padding:0 20px 18px;color:var(--muted);line-height:1.8}
    .faq-item[open]{border-color:#bfd0ff;box-shadow:0 12px 28px rgba(33,92,255,.08)}
    .quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .quote-card{padding:18px}
    .quote-card p{margin:0;color:var(--muted);line-height:1.8}
    .quote-card .name{display:block;margin-top:14px;font-weight:800;color:var(--text)}
    .quote-card .role{display:block;font-size:13px;color:var(--muted);margin-top:4px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud a,.tag-cloud span{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#344054;font-size:13px}
    .article-list{display:grid;gap:12px}
    .article-item{display:flex;justify-content:space-between;gap:14px;padding:16px 18px;border:1px solid var(--line);border-radius:16px;background:#fff}
    .article-item strong{display:block;margin-bottom:4px}
    .article-item span{color:var(--muted);font-size:13px}
    .footer{margin-top:12px;background:#12213a;color:#dbe7ff;padding:28px 0 20px}
    .footer .container{display:grid;gap:18px}
    .footer a{color:#fff}
    .footer-top{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:start}
    .footer small,.footer p{color:#b6c7ea;line-height:1.8}
    .footer-links{display:flex;flex-wrap:wrap;gap:12px}
    .floating{position:fixed;right:14px;bottom:14px;z-index:60;display:grid;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:18px;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);font-weight:800;color:var(--brand)}
    .float-panel{position:fixed;right:14px;bottom:76px;z-index:61;width:min(320px,calc(100vw - 28px));background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:16px;display:none}
    .float-panel.open{display:block}
    .float-panel h3{margin:0 0 10px}
    .float-panel .qr{display:grid;grid-template-columns:88px 1fr;gap:12px;align-items:center}
    .float-panel img{border-radius:14px;border:1px solid var(--line)}
    .backtop{position:fixed;right:14px;bottom:132px}
    .reveal{opacity:0;transform:translateY(16px);transition:.55s ease}
    .reveal.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-wrap,.split,.footer-top,.grid-4,.grid-3,.steps,.quote-grid,.rating{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-btn{display:flex}
      .nav.open .nav-links{display:flex;position:absolute;left:0;right:0;top:72px;background:rgba(255,255,255,.98);padding:12px 16px 16px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);justify-content:flex-start}
      .nav.open{position:relative}
      .form-grid{grid-template-columns:1fr}
      .mobile-only{display:inline-flex}
    }