:root{
      --bg:#fff8f3;
      --bg2:#fffdfb;
      --card:#ffffff;
      --text:#1e2430;
      --muted:#5f6979;
      --line:#eadfd7;
      --brand:#ff5b3f;
      --brand2:#ffb11a;
      --blue:#1d6cff;
      --green:#1fbf75;
      --shadow:0 18px 50px rgba(47,44,60,.10);
      --radius:22px;
      --radius-sm:16px;
      --container:1180px;
    }
    *{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:linear-gradient(180deg,#fff6ef 0%,#fffdfb 22%,#fff 100%);color:var(--text)}
    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(255,250,246,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(234,223,215,.7)}
    .nav-wrap{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;background:#fff;border-radius:12px;padding:6px;box-shadow:0 8px 20px rgba(0,0,0,.06)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:16px;letter-spacing:.5px}
    .brand-text span{display:block;font-size:12px;color:var(--muted)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);padding:10px 12px;border-radius:12px}
    .nav{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
    .nav a{font-size:14px;color:#354154;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav a:hover,.nav a.active{background:#fff0ea;color:var(--brand)}
    .home-btn{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--brand),#ff7f49);color:#fff;padding:11px 16px;border-radius:999px;box-shadow:0 14px 28px rgba(255,91,63,.22);transition:.25s}
    .home-btn:hover{transform:translateY(-1px);box-shadow:0 18px 30px rgba(255,91,63,.28)}
    main{overflow:hidden}
    .hero{position:relative;padding:56px 0 28px}
    .hero:before,.hero:after{content:"";position:absolute;border-radius:50%;pointer-events:none}
    .hero:before{width:360px;height:360px;background:radial-gradient(circle,rgba(255,177,26,.18),rgba(255,177,26,0) 65%);top:-120px;right:-100px}
    .hero:after{width:280px;height:280px;background:radial-gradient(circle,rgba(29,108,255,.12),rgba(29,108,255,0) 68%);left:-100px;bottom:-120px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:stretch}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#fff2e9;color:#c94c23;border:1px solid #ffd7c7;padding:8px 14px;border-radius:999px;font-size:13px;font-weight:700}
    h1{font-size:clamp(34px,5vw,54px);line-height:1.05;margin:18px 0 14px;letter-spacing:-.8px}
    .lead{font-size:17px;line-height:1.8;color:var(--muted);margin:0 0 22px;max-width:40rem}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:24px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:14px;padding:13px 18px;border:1px solid transparent;font-weight:700;transition:.25s;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#ff7f49);color:#fff;box-shadow:0 14px 28px rgba(255,91,63,.22)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px)}
    .hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .stat{background:linear-gradient(180deg,#fff,#fff8f4);border:1px solid #f0e4db;border-radius:18px;padding:16px;box-shadow:0 10px 24px rgba(80,49,25,.05)}
    .stat strong{display:block;font-size:24px;margin-bottom:6px}
    .stat span{font-size:13px;color:var(--muted);line-height:1.5}
    .hero-panel{background:linear-gradient(180deg,#1e2330 0%,#242b3d 100%);color:#fff;border-radius:28px;padding:24px;box-shadow:var(--shadow);position:relative;overflow:hidden}
    .hero-panel:before{content:"";position:absolute;inset:auto -40px -40px auto;width:180px;height:180px;background:radial-gradient(circle,rgba(255,91,63,.34),rgba(255,91,63,0) 70%)}
    .hero-panel h2{font-size:20px;margin:0 0 10px}
    .hero-panel p{margin:0 0 18px;color:#d6deea;line-height:1.8}
    .mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .mini{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:14px;min-height:92px}
    .mini strong{display:block;font-size:15px;margin-bottom:6px}
    .mini span{font-size:13px;line-height:1.6;color:#d9e0eb}
    section{padding:28px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:18px}
    .section-head h2{margin:0;font-size:clamp(24px,3vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:56ch;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:16px}
    .card{background:var(--card);border:1px solid #f0e4db;border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;transition:.25s}
    .card:hover{transform:translateY(-4px)}
    .icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#fff0ea,#fff4d8);color:var(--brand);font-weight:800;margin-bottom:14px}
    .card h3,.card h4{margin:0 0 10px}
    .card p{margin:0;color:var(--muted);line-height:1.75}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#334055;font-size:13px}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .list{display:grid;gap:12px}
    .list-item{display:flex;gap:12px;align-items:flex-start;padding:14px 0;border-bottom:1px dashed #eee3da}
    .list-item:last-child{border-bottom:0}
    .dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));margin-top:8px;flex:0 0 auto}
    .table-wrap{overflow:auto;border-radius:22px;border:1px solid #efe3da;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:780px}
    th,td{padding:16px 14px;border-bottom:1px solid #f1e7df;text-align:left;vertical-align:top}
    th{background:#fff7f2;color:#263042;font-size:14px}
    td{color:#445061}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#eaf7ef;color:#15764a;font-size:12px;font-weight:700}
    .compare-high{color:#d9482d;font-weight:800}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{position:relative;padding:18px}
    .step-num{font-size:12px;font-weight:800;color:var(--brand);letter-spacing:.12em;text-transform:uppercase;margin-bottom:10px}
    .step:after{content:"";position:absolute;inset:auto 16px 16px auto;width:56px;height:56px;border-radius:50%;background:radial-gradient(circle,rgba(255,91,63,.12),rgba(255,91,63,0) 70%)}
    .case-grid,.review-grid,.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .quote{font-size:15px;line-height:1.8;color:#2f3948}
    .quote small{display:block;margin-top:12px;color:var(--muted)}
    .metric-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .metric{background:linear-gradient(180deg,#fff,#fff8f4);border:1px solid #f0e4db;border-radius:18px;padding:18px}
    .metric strong{display:block;font-size:28px;margin-bottom:6px}
    .metric span{color:var(--muted);font-size:13px}
    .faq{display:grid;gap:12px}
    .faq-item{background:#fff;border:1px solid #f0e4db;border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
    .faq-q{width:100%;text-align:left;border:0;background:transparent;padding:18px 18px;font-size:16px;font-weight:700;color:var(--text);display:flex;justify-content:space-between;gap:16px;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 18px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{max-height:180px;padding-bottom:18px}
    .faq-item.open .faq-q .arrow{transform:rotate(180deg)}
    .arrow{transition:.25s;color:var(--brand)}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .form-group{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700;color:#2b3546}
    input,select,textarea{width:100%;border:1px solid #e8ddd4;border-radius:14px;background:#fff;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:.2s}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#ff7f49;box-shadow:0 0 0 4px rgba(255,91,63,.12)}
    .form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:6px}
    .footer{margin-top:10px;background:#1f2533;color:#dce3ef;padding:30px 0}
    .footer a{color:#fff}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:18px;align-items:start}
    .footer .muted{color:#b7c1d2;line-height:1.8}
    .friend-links{display:flex;flex-wrap:wrap;gap:10px}
    .friend-links a{background:rgba(255,255,255,.08);padding:8px 12px;border-radius:999px}
    .floating{position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px}
    .floating a,.floating button{width:52px;height:52px;border-radius:16px;border:0;display:grid;place-items:center;box-shadow:0 14px 28px rgba(0,0,0,.16);cursor:pointer}
    .floating .kf{background:linear-gradient(135deg,var(--brand),#ff8f59);color:#fff}
    .floating .top{background:#fff;color:var(--text);border:1px solid #eadfd7}
    .side-panel{display:grid;gap:14px}
    .qr-card{display:flex;gap:14px;align-items:center}
    .qr-card img{width:92px;height:92px;object-fit:cover;border-radius:16px;border:1px solid #eee}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start}
    .timeline-item .mark{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--brand))}
    .article-list{display:grid;gap:12px}
    .article-list a{display:flex;justify-content:space-between;gap:14px;padding:14px 16px;border-radius:16px;border:1px solid #efe3da;background:#fff}
    .article-list a span{color:var(--muted)}
    .reveal{opacity:0;transform:translateY(18px);transition:.55s ease}
    .reveal.in{opacity:1;transform:none}
    @media (max-width: 980px){
      .hero-grid,.split,.grid-3,.grid-4,.steps,.case-grid,.review-grid,.article-grid,.footer-grid,.metric-row{grid-template-columns:1fr}
      .nav-toggle{display:inline-flex}
      .nav{display:none;position:absolute;left:16px;right:16px;top:66px;background:#fff;border:1px solid var(--line);padding:12px;border-radius:18px;box-shadow:var(--shadow)}
      .nav.open{display:flex;flex-direction:column;align-items:flex-start}
      .hero{padding-top:30px}
      .hero-stats{grid-template-columns:1fr}
      .form-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
    }