:root{
      --bg:#f6f2ea;
      --panel:#fffaf2;
      --panel-2:#ffffff;
      --text:#1f2937;
      --muted:#5d6675;
      --line:#e8dfcf;
      --brand:#7b4dff;
      --brand2:#00a6a6;
      --accent:#ff8a3d;
      --shadow:0 12px 30px rgba(72,52,120,.10);
      --shadow2:0 18px 45px rgba(35,28,51,.12);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Inter,system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at top left,rgba(123,77,255,.08),transparent 28%),
      radial-gradient(circle at 80% 12%,rgba(0,166,166,.10),transparent 22%),
      linear-gradient(180deg,#fffdf8 0%,var(--bg) 100%);
      color:var(--text);line-height:1.7}
    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(255,250,242,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(232,223,207,.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:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:6px}
    .brand strong{display:block;font-size:16px;line-height:1.2}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--muted);padding:8px 10px;border-radius:999px;transition:.2s ease}
    .nav-links a:hover,.nav-links a.active{background:#fff;color:var(--text);box-shadow:0 8px 20px rgba(0,0,0,.06)}
    .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:.22s ease;cursor:pointer;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4a7bff);color:#fff;box-shadow:0 14px 30px rgba(123,77,255,.24)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    .hero{padding:34px 0 22px}
    .hero-shell{position:relative;overflow:hidden;background:
      linear-gradient(135deg,rgba(123,77,255,.10),rgba(255,255,255,.92) 45%,rgba(0,166,166,.10)),
      linear-gradient(180deg,#fff,#fffaf2);
      border:1px solid rgba(232,223,207,.9);border-radius:28px;box-shadow:var(--shadow2)}
    .hero-shell:before,.hero-shell:after{content:"";position:absolute;border-radius:50%;pointer-events:none}
    .hero-shell:before{width:240px;height:240px;right:-70px;top:-70px;background:radial-gradient(circle,rgba(255,138,61,.24),transparent 68%)}
    .hero-shell:after{width:260px;height:260px;left:-90px;bottom:-110px;background:radial-gradient(circle,rgba(123,77,255,.16),transparent 68%)}
    .hero-grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:24px;padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 12px;font-size:13px;color:var(--muted);box-shadow:0 8px 22px rgba(0,0,0,.05)}
    h1{margin:16px 0 14px;font-size:clamp(30px,4.6vw,54px);line-height:1.08;letter-spacing:-.02em}
    .lead{margin:0 0 18px;color:var(--muted);font-size:16px;max-width:60ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:24px}
    .stat{background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:0 10px 26px rgba(0,0,0,.05)}
    .stat b{display:block;font-size:24px;line-height:1.1}
    .stat span{font-size:13px;color:var(--muted)}
    .hero-card{background:linear-gradient(180deg,rgba(255,255,255,.92),#fff);border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:var(--shadow)}
    .hero-card h2{margin:0 0 12px;font-size:18px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:999px;background:#f7f4ff;border:1px solid #e4dcff;color:#4e3aa4;font-size:13px}
    .section{padding:18px 0}
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-title h2{margin:0;font-size:28px;line-height:1.15}
    .section-title p{margin:0;color:var(--muted);max-width:72ch}
    .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}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .card{background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:.24s ease}
    .card:hover{transform:translateY(-4px);box-shadow:var(--shadow2)}
    .card h3,.card h4{margin:0 0 8px}
    .card p{margin:0;color:var(--muted)}
    .metric{display:flex;flex-direction:column;gap:8px}
    .metric strong{font-size:26px}
    .icon-badge{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(123,77,255,.12),rgba(0,166,166,.12));color:#4a4a86;font-weight:800}
    .feature-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .feature{display:flex;gap:12px;padding:14px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .feature i{font-style:normal;width:28px;height:28px;border-radius:10px;background:#f3eefc;display:grid;place-items:center;color:#6a49f1;flex:0 0 auto}
    .flow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}
    .step{padding:16px;border-radius:18px;background:linear-gradient(180deg,#fff, #fffaf2);border:1px solid var(--line)}
    .step .num{font-weight:800;color:var(--brand);font-size:14px}
    .table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:880px}
    th,td{padding:16px 14px;border-bottom:1px solid #efe7d9;text-align:left;vertical-align:top}
    th{background:#fcfaf5;font-size:14px}
    tr:last-child td{border-bottom:none}
    .score{font-size:18px;font-weight:800;color:#0f766e}
    .pill{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border-radius:999px;background:#f5faf7;color:#166534;font-size:12px;border:1px solid #d8eee1}
    .compare-box{background:linear-gradient(135deg,#fff, #fff6eb);border:1px solid var(--line);border-radius:24px;padding:20px}
    .faq details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px;box-shadow:var(--shadow)}
    .faq details+details{margin-top:12px}
    .faq summary{cursor:pointer;font-weight:700;list-style:none}
    .faq summary::-webkit-details-marker{display:none}
    .faq p{margin:10px 0 0;color:var(--muted)}
    .review{display:flex;flex-direction:column;gap:10px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:10px}
    .stars{color:#ff8a3d;letter-spacing:1px}
    .article-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .article{padding:18px;border-radius:20px;border:1px solid var(--line);background:#fff}
    .article time{display:block;color:var(--muted);font-size:13px;margin-bottom:8px}
    .form-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:14px}
    form{display:grid;gap:12px}
    label{font-size:14px;font-weight:700}
    input,select,textarea{width:100%;margin-top:6px;padding:13px 14px;border:1px solid #ddd5c5;border-radius:14px;background:#fff;color:var(--text);font:inherit;outline:none}
    input:focus,select:focus,textarea:focus{border-color:#8b6cff;box-shadow:0 0 0 4px rgba(123,77,255,.12)}
    textarea{min-height:130px;resize:vertical}
    .footer{margin-top:18px;background:#1f2937;color:#e5e7eb}
    .footer a{color:#fff}
    .footer .container{padding:24px 0}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:16px}
    .footer small,.footer p,.footer li{color:#cbd5e1}
    .footer ul{margin:0;padding-left:18px}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px}
    .float-btn{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);font-weight:800}
    .backtop{opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s ease}
    .backtop.show{opacity:1;pointer-events:auto;transform:translateY(0)}
    .fade-in{opacity:0;transform:translateY(18px);transition:.55s ease}
    .fade-in.in-view{opacity:1;transform:translateY(0)}
    .mobile-only{display:none}
    @media (max-width: 1024px){
      .hero-grid,.form-grid,.footer-grid{grid-template-columns:1fr}
      .grid-4,.grid-3,.grid-2,.flow{grid-template-columns:repeat(2,minmax(0,1fr))}
      .article-list{grid-template-columns:1fr}
    }
    @media (max-width: 760px){
      .nav-links{display:none;position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow2)}
      .nav-links.open{display:flex;flex-direction:column;align-items:stretch}
      .nav-links a{padding:12px 14px}
      .menu-toggle{display:inline-flex}
      .mobile-only{display:inline-flex}
      .hero-grid{padding:22px}
      .grid-4,.grid-3,.grid-2,.flow,.hero-stats,.feature-list{grid-template-columns:1fr}
      .section-title{flex-direction:column;align-items:flex-start}
      .nav-actions .btn-secondary{display:none}
    }