:root{
      --bg:#f6f8fc;
      --surface:#ffffff;
      --surface-2:#f1f5ff;
      --text:#1f2a37;
      --muted:#5f6b7a;
      --line:#dbe4f0;
      --primary:#2563eb;
      --primary-2:#0ea5e9;
      --accent:#14b8a6;
      --warm:#fff7e8;
      --shadow:0 18px 45px rgba(15,23,42,.08);
      --radius:20px;
      --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;background:linear-gradient(180deg,#eff5ff 0%,#f7f9fd 28%,#ffffff 100%);color:var(--text);line-height:1.65}
    img{display:block;max-width:100%}
    a{color:var(--primary);text-decoration:none}
    a:hover{opacity:.9}
    .container{max-width:var(--container);margin:0 auto;padding:0 18px}
    .topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,228,240,.8)}
    .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:44px;height:44px;border-radius:12px;object-fit:contain;background:#fff;border:1px solid var(--line);box-shadow:0 8px 20px rgba(37,99,235,.08)}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:18px;letter-spacing:.4px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .nav-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
    .home-link,.btn,.ghost-btn,.submit-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;padding:10px 16px;font-weight:700;border:1px solid transparent;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease}
    .home-link,.btn,.submit-btn{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 12px 24px rgba(37,99,235,.18)}
    .ghost-btn{background:#fff;color:var(--text);border-color:var(--line)}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:14px;padding:10px 12px}
    .menu{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
    .menu a{color:var(--text);font-size:14px;font-weight:600}
    .hero{position:relative;overflow:hidden;padding:42px 0 26px}
    .hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(16px);pointer-events:none}
    .hero::before{width:300px;height:300px;background:radial-gradient(circle,rgba(20,184,166,.24),transparent 68%);top:-80px;right:-40px}
    .hero::after{width:260px;height:260px;background:radial-gradient(circle,rgba(37,99,235,.18),transparent 66%);left:-90px;bottom:10px}
    .hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:24px;align-items:stretch}
    .hero-card,.glass-card,.section-card{background:rgba(255,255,255,.88);border:1px solid rgba(219,228,240,.9);border-radius:24px;box-shadow:var(--shadow)}
    .hero-card{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--warm);color:#9a6700;border:1px solid #ffe0a8;border-radius:999px;padding:7px 12px;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,50px);line-height:1.08;letter-spacing:-.8px}
    .lead{color:var(--muted);font-size:16px;max-width:58ch;margin:0 0 22px}
    .hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
    .point{padding:14px;border-radius:18px;background:linear-gradient(180deg,#fff,#f7fbff);border:1px solid var(--line)}
    .point strong{display:block;font-size:18px}
    .point span{font-size:13px;color:var(--muted)}
    .hero-side{display:grid;gap:14px}
    .stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .stat{padding:18px;border-radius:20px;background:linear-gradient(180deg,#ffffff,#f7fbff);border:1px solid var(--line)}
    .stat b{display:block;font-size:28px;line-height:1;color:#0f172a}
    .stat small{color:var(--muted)}
    .side-panel{padding:20px}
    .side-panel h2,.section-title{margin:0 0 10px;font-size:26px;line-height:1.15}
    .section{padding:24px 0}
    .section-card{padding:24px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}
    .section-head p{margin:0;color:var(--muted);max-width:70ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:0 8px 24px rgba(15,23,42,.04);transition:transform .2s ease,box-shadow .2s ease}
    .card:hover,.hero-card:hover,.glass-card:hover{transform:translateY(-3px);box-shadow:0 18px 34px rgba(15,23,42,.08)}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted)}
    .icon{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(20,184,166,.14));display:grid;place-items:center;font-size:20px;margin-bottom:12px}
    .chips{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#304254}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#f6f9ff);border:1px solid var(--line)}
    .step .num{display:inline-flex;width:34px;height:34px;border-radius:12px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;font-weight:800;margin-bottom:12px}
    .compare{width:100%;border-collapse:separate;border-spacing:0 10px}
    .compare th,.compare td{padding:14px 12px;text-align:left;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
    .compare th:first-child,.compare td:first-child{border-left:1px solid var(--line);border-radius:14px 0 0 14px}
    .compare th:last-child,.compare td:last-child{border-right:1px solid var(--line);border-radius:0 14px 14px 0}
    .rating{display:flex;align-items:center;gap:8px;font-weight:800;color:#0f172a}
    .stars{color:#f59e0b;letter-spacing:2px}
    .table-wrap{overflow-x:auto}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:72px 1fr;gap:14px;align-items:start;padding:16px;border:1px solid var(--line);border-radius:18px;background:#fff}
    .timeline-item time{font-weight:800;color:var(--primary)}
    .review-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .quote{padding:18px;border-radius:20px;background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--line)}
    .quote .who{margin-top:14px;color:#0f172a;font-weight:700}
    .quote .role{font-size:13px;color:var(--muted)}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none;transition:border-color .2s ease,box-shadow .2s ease}
    input:focus,select:focus,textarea:focus{border-color:rgba(37,99,235,.55);box-shadow:0 0 0 4px rgba(37,99,235,.08)}
    textarea{min-height:120px;resize:vertical}
    .footer{margin-top:8px;background:#eef4ff;color:#1f2a37;border-top:1px solid #d8e4f4}
    .footer a{color:#1d4ed8}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;padding:24px 0}
    .footer small{color:#546273}
    .links{display:flex;flex-wrap:wrap;gap:10px}
    .qrcode{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
    .qrcode img{width:118px;border-radius:16px;border:1px solid var(--line);background:#fff}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:var(--shadow);border:none;cursor:pointer}
    .scroll-top{opacity:0;pointer-events:none;transform:translateY(8px);transition:.2s ease}
    .scroll-top.show{opacity:1;pointer-events:auto;transform:none}
    .reveal{opacity:0;transform:translateY(16px);transition:.6s ease}
    .reveal.show{opacity:1;transform:none}
    .mobile-menu{display:none}
    .article-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .article-list a{display:block;padding:16px;border:1px solid var(--line);border-radius:18px;background:#fff;color:var(--text)}
    .badge-line{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
    .badge{padding:7px 10px;border-radius:999px;background:var(--surface-2);border:1px solid #dce8ff;font-size:12px;color:#234}
    @media (max-width: 980px){
      .hero-grid,.split,.footer-grid,.grid-3,.grid-4,.steps,.review-list,.article-list{grid-template-columns:1fr 1fr}
      .hero-points{grid-template-columns:1fr}
      .nav-actions .menu{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-menu{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 18px 28px rgba(15,23,42,.06)}
      .mobile-menu.open{display:block}
      .mobile-menu .menu{padding:12px 18px;display:grid;grid-template-columns:1fr 1fr;gap:10px}
    }
    @media (max-width: 640px){
      .hero-card,.section-card{padding:20px}
      .hero-grid,.split,.footer-grid,.grid-3,.grid-4,.steps,.review-list,.article-list,.form-grid,.stats{grid-template-columns:1fr}
      .nav{padding:12px 0}
      .brand-text strong{font-size:16px}
      .hero{padding-top:20px}
      h1{font-size:28px}
      .section-head{flex-direction:column;align-items:flex-start}
      .compare{min-width:820px}
      .timeline-item{grid-template-columns:1fr}
    }