:root{--bg:#f7f5ef;--panel:#ffffff;--panel2:#f0f6ff;--line:#dce3ee;--text:#18304a;--muted:#58708a;--brand:#1b77ff;--brand2:#14b8a6;--accent:#ff9f43;--shadow:0 18px 50px rgba(24,48,74,.09);--radius:20px;--container:1180px}
    *{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#f8fbff 0%,#f7f5ef 28%,#fff 100%);color:var(--text)}
    a{color:var(--brand);text-decoration:none} img{display:block;max-width:100%}
    .wrap{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    header{position:sticky;top:0;z-index:30;background:rgba(248,251,255,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,227,238,.75)}
    .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:4px;box-shadow:0 8px 20px rgba(27,119,255,.12)}
    .brand-txt{min-width:0}.brand-txt strong{display:block;font-size:18px;line-height:1.2}.brand-txt span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
    .nav-links{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--text);padding:8px 10px;border-radius:999px;transition:.22s ease}
    .nav-links a:hover,.nav-links a.active{background:#eaf2ff;color:#0d57d3}
    .nav-cta{display:flex;gap:10px;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:14px;padding:12px 16px;font-weight:700;cursor:pointer;transition:.22s ease;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4d9dff);color:#fff;box-shadow:0 12px 24px rgba(27,119,255,.22)}
    .btn-primary:hover{transform:translateY(-1px)} .btn-soft{background:#fff;color:var(--text);border-color:var(--line)} .btn-soft:hover{border-color:#bcd0ea;transform:translateY(-1px)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);width:44px;height:44px;border-radius:14px}
    .menu-btn span{display:block;width:18px;height:2px;background:var(--text);margin:4px auto;border-radius:2px}
    main{overflow:hidden}
    .hero{position:relative;padding:40px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-copy,.hero-side,.card,.section{background:rgba(255,255,255,.9);border:1px solid rgba(220,227,238,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-copy{padding:30px;position:relative;overflow:hidden;background:linear-gradient(180deg,#ffffff 0%,#f7fbff 100%)}
    .badge{display:inline-flex;align-items:center;gap:8px;background:#eef6ff;color:#0d57d3;padding:8px 12px;border-radius:999px;font-size:13px;font-weight:700}
    h1{font-size:clamp(30px,4vw,52px);line-height:1.08;margin:16px 0 14px;letter-spacing:-.02em}
    .lead{font-size:17px;line-height:1.8;color:var(--muted);margin:0 0 20px;max-width:44em}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:10px 0 18px}
    .hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
    .stat{padding:16px;border-radius:18px;background:linear-gradient(180deg,#f7fbff,#fff);border:1px solid var(--line)}
    .stat b{display:block;font-size:24px;margin-bottom:6px}.stat span{color:var(--muted);font-size:13px;line-height:1.5}
    .hero-side{padding:22px;display:grid;gap:14px;align-content:start;background:linear-gradient(160deg,#f8fbff,#eef8f6)}
    .mini-panels{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .mini{padding:15px;border-radius:16px;background:#fff;border:1px solid #dfe8f3}
    .mini h3{margin:0 0 8px;font-size:15px}.mini p{margin:0;color:var(--muted);font-size:13px;line-height:1.65}
    .section{margin:18px 0;padding:24px}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:18px}
    .section-head h2{margin:0;font-size:28px}.section-head p{margin:0;color:var(--muted);max-width:60ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .card{padding:18px;background:linear-gradient(180deg,#fff,#fbfdff);transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease}
    .card:hover{transform:translateY(-3px);box-shadow:0 20px 46px rgba(24,48,74,.12);border-color:#cfe0f5}
    .icon{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,#e9f2ff,#dbfff8);display:grid;place-items:center;font-size:20px;margin-bottom:12px}
    .card h3{margin:0 0 10px;font-size:18px}.card p,.card li{margin:0;color:var(--muted);line-height:1.75;font-size:14px}
    .list{padding-left:18px;margin:0;display:grid;gap:8px}
    .chips{display:flex;flex-wrap:wrap;gap:10px}.chip{padding:9px 12px;border-radius:999px;background:#f3f7fc;border:1px solid #e1e9f5;color:#24415f;font-size:13px}
    .img-box{border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#fff}
    .img-box img{width:100%;height:auto}
    .table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:18px;background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px} th,td{padding:14px 14px;text-align:left;border-bottom:1px solid #e8eef5;font-size:14px;vertical-align:top} th{background:#f5f9ff;color:#17324f}
    .scorebox{display:grid;grid-template-columns:1.05fr .95fr;gap:14px}
    .rating{padding:22px;border-radius:20px;background:linear-gradient(135deg,#f2f8ff,#f3fff8);border:1px solid #d8e9f5}
    .stars{font-size:22px;color:#f59e0b;letter-spacing:2px;margin:6px 0 10px}
    .faq details{border:1px solid var(--line);border-radius:16px;background:#fff;padding:0 16px;margin-bottom:12px;overflow:hidden}
    .faq summary{list-style:none;cursor:pointer;padding:16px 0;font-weight:700;color:var(--text)} .faq summary::-webkit-details-marker{display:none}
    .faq .ans{padding:0 0 16px;color:var(--muted);line-height:1.75}
    .timeline{display:grid;gap:12px}.step{display:grid;grid-template-columns:44px 1fr;gap:14px;padding:16px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .num{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,#1b77ff,#14b8a6);color:#fff;display:grid;place-items:center;font-weight:800}
    .reviews .card{background:#fffefb}
    .floating{position:fixed;right:16px;bottom:16px;z-index:40;display:grid;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);display:grid;place-items:center;font-size:20px}
    .float-btn.primary{background:linear-gradient(135deg,var(--brand),#49b0ff);color:#fff;border:none}
    .fade{opacity:0;transform:translateY(16px);transition:.6s ease}.fade.show{opacity:1;transform:none}
    .contact{display:grid;grid-template-columns:1fr .9fr;gap:14px}
    form{display:grid;gap:12px}.field{display:grid;gap:7px} label{font-size:14px;font-weight:700} input,select,textarea{width:100%;border:1px solid #d8e2ef;border-radius:14px;padding:12px 14px;font:inherit;background:#fff;color:var(--text);outline:none} textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8ab8ff;box-shadow:0 0 0 4px rgba(27,119,255,.08)}
    footer{margin-top:18px;background:#10233a;color:#e7f0fb}
    .footer{padding:26px 0 22px}.footer a{color:#bfe0ff}.footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:16px}
    .footer h3{margin:0 0 12px;font-size:17px;color:#fff}.footer p,.footer li{margin:0;color:#c9daeb;line-height:1.75;font-size:14px}.footer ul{margin:0;padding-left:18px;display:grid;gap:8px}
    .copy{margin-top:18px;padding-top:14px;border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:#b9c9d8}
    .article-list{display:grid;gap:10px}.article-item{padding:14px 16px;border-radius:16px;background:#fff;border:1px solid var(--line);display:flex;justify-content:space-between;gap:10px;align-items:center}
    .article-item span{color:var(--muted);font-size:13px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud a{padding:8px 11px;border-radius:999px;background:#f3f7fc;border:1px solid #e1e9f5;color:#29445f;font-size:13px}
    .toc{display:flex;flex-wrap:wrap;gap:10px}
    .toc a{padding:8px 10px;background:#fff;border:1px solid var(--line);border-radius:999px;color:var(--text);font-size:13px}
    .mobile-toggle{display:none}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-4,.grid-2,.scorebox,.contact,.footer-grid{grid-template-columns:1fr}
      .nav-links{display:none}.nav-links.open{display:flex;position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)}
      .menu-btn{display:inline-grid;place-items:center}
      .nav{position:relative}.hero{padding-top:18px}.hero-stats{grid-template-columns:1fr}
      .mobile-toggle{display:block}
      .section-head{flex-direction:column;align-items:start}
    }