:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f2f5ff;
      --text:#172033;
      --muted:#5f6b85;
      --line:#d9e0f0;
      --brand:#4f6df5;
      --brand2:#ff7a59;
      --brand3:#10b981;
      --shadow:0 18px 40px rgba(27,39,77,.08);
      --shadow2:0 10px 22px rgba(27,39,77,.12);
      --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;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(79,109,245,.10), transparent 28%),
        radial-gradient(circle at right 20%, rgba(255,122,89,.10), transparent 25%),
        linear-gradient(180deg,#fbfcff 0%, #f7f8fc 45%, #f5f7fb 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:30;
      backdrop-filter:saturate(1.2) blur(12px);
      background:rgba(247,248,252,.82);
      border-bottom:1px solid rgba(217,224,240,.75);
    }
    .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;object-fit:contain;border-radius:12px;background:#fff;padding:6px;box-shadow:0 8px 18px rgba(27,39,77,.08)}
    .brand strong{display:block;font-size:1.02rem;line-height:1.1}
    .brand span{display:block;font-size:.82rem;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:10px}
    .nav-links a,.nav-links button{
      border:1px solid transparent;background:transparent;color:var(--text);
      padding:9px 12px;border-radius:999px;font-size:.92rem;cursor:pointer;
      transition:.22s ease;
    }
    .nav-links a:hover,.nav-links button:hover{background:#fff;border-color:var(--line);box-shadow:0 10px 18px rgba(27,39,77,.06)}
    .nav-cta{
      background:linear-gradient(135deg,var(--brand),#7b5cff)!important;color:#fff!important;border-color:transparent!important;
      box-shadow:0 12px 24px rgba(79,109,245,.22)
    }
    .menu-btn{display:none}
    .hero{
      padding:42px 0 24px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.1fr .9fr;gap:22px;align-items:stretch;
    }
    .hero-card,.panel{
      background:linear-gradient(180deg,rgba(255,255,255,.96),rgba(255,255,255,.92));
      border:1px solid rgba(217,224,240,.9);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-card{padding:28px;position:relative;overflow:hidden}
    .hero-card:before,.hero-card:after{
      content:"";position:absolute;border-radius:50%;pointer-events:none;filter:blur(4px)
    }
    .hero-card:before{width:220px;height:220px;background:radial-gradient(circle, rgba(79,109,245,.16), transparent 62%);top:-70px;right:-60px}
    .hero-card:after{width:180px;height:180px;background:radial-gradient(circle, rgba(255,122,89,.15), transparent 60%);bottom:-80px;left:-40px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.88rem;color:#2e4edb;background:#eef3ff;border:1px solid #dfe8ff;padding:8px 12px;border-radius:999px}
    h1{margin:14px 0 14px;font-size:clamp(2rem,4vw,3.4rem);line-height:1.08;letter-spacing:-.03em}
    .lead{margin:0;color:var(--muted);font-size:1.03rem;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 18px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:13px 18px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text);
      font-weight:700;transition:.22s ease;cursor:pointer
    }
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow2)}
    .btn-primary{background:linear-gradient(135deg,var(--brand2),#ff9c58);color:#fff;border-color:transparent}
    .btn-secondary{background:linear-gradient(135deg,#edf2ff,#f8fbff)}
    .meta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}
    .meta-chip{padding:9px 12px;border-radius:999px;background:#f7f9ff;border:1px solid var(--line);color:var(--muted);font-size:.9rem}
    .hero-side{display:grid;gap:14px}
    .mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .metric{
      padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#fbfcff);border:1px solid var(--line)
    }
    .metric strong{display:block;font-size:1.5rem}
    .metric span{display:block;color:var(--muted);font-size:.9rem;margin-top:4px;line-height:1.4}
    .hero-visual{padding:18px}
    .visual-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
    .signal{display:inline-flex;align-items:center;gap:8px;font-size:.9rem;color:#2a3b66}
    .signal i{width:10px;height:10px;border-radius:50%;background:var(--brand3);box-shadow:0 0 0 6px rgba(16,185,129,.12)}
    .stack{
      display:grid;gap:10px
    }
    .stack .line{
      height:14px;border-radius:999px;background:linear-gradient(90deg,#e9eeff 0%,#dfe7ff 100%);
    }
    .stack .line:nth-child(2){width:86%}
    .stack .line:nth-child(3){width:72%}
    .stack .line:nth-child(4){width:94%}
    .section{padding:26px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:clamp(1.4rem,2.2vw,2rem)}
    .section-head p{margin:0;color:var(--muted);max-width:70ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:0 12px 26px rgba(27,39,77,.05);padding:18px;transition:.22s ease}
    .card:hover{transform:translateY(-3px);box-shadow:var(--shadow2)}
    .icon{
      width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,#edf2ff,#fff3ef);
      display:grid;place-items:center;margin-bottom:12px;color:var(--brand);font-weight:800
    }
    .card h3{margin:0 0 8px;font-size:1.02rem}
    .card p,.card li{margin:0;color:var(--muted);line-height:1.7}
    .list-clean{list-style:none;padding:0;margin:0;display:grid;gap:10px}
    .list-clean li{padding-left:18px;position:relative}
    .list-clean li:before{content:"";position:absolute;left:0;top:.72em;width:7px;height:7px;border-radius:50%;background:var(--brand2)}
    .badge-row{display:flex;flex-wrap:wrap;gap:10px}
    .badge{padding:8px 11px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#30405f;font-size:.88rem}
    .table-wrap{overflow: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;border-bottom:1px solid #edf1f8;text-align:left;vertical-align:top}
    th{background:#f7f9ff;font-size:.94rem}
    td{color:var(--muted);line-height:1.65}
    .highlight{color:#1e2f60;font-weight:700}
    .flow{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#fafcff);border:1px solid var(--line);position:relative}
    .step .num{width:34px;height:34px;border-radius:12px;background:linear-gradient(135deg,var(--brand),#7f62ff);color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:10px}
    .step h3{margin:0 0 8px}
    .step p{margin:0;color:var(--muted);line-height:1.65}
    .faq details{border:1px solid var(--line);background:#fff;border-radius:16px;padding:16px 18px}
    .faq details+details{margin-top:12px}
    .faq summary{cursor:pointer;font-weight:700;list-style:none}
    .faq summary::-webkit-details-marker{display:none}
    .faq .ans{color:var(--muted);margin-top:10px;line-height:1.75}
    .review{display:grid;gap:10px}
    .review .who{display:flex;align-items:center;justify-content:space-between;gap:10px}
    .stars{color:#f59e0b;letter-spacing:2px;font-size:1rem}
    .thumb-row{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .ai-page-image{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow);width:100%;height:auto}
    .form-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:16px}
    form{display:grid;gap:12px}
    .field{display:grid;gap:8px}
    label{font-weight:700;font-size:.92rem}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text);
      font:inherit;outline:none;transition:.2s ease
    }
    input:focus,select:focus,textarea:focus{border-color:#a9b8ff;box-shadow:0 0 0 4px rgba(79,109,245,.10)}
    textarea{min-height:132px;resize:vertical}
    .contact-box{display:grid;gap:14px}
    .contact-info{display:grid;gap:10px}
    .contact-item{display:flex;gap:12px;align-items:flex-start;padding:14px;border-radius:16px;background:#fff;border:1px solid var(--line)}
    .contact-item b{display:block}
    .fixed-tools{
      position:fixed;right:16px;bottom:16px;display:grid;gap:10px;z-index:40
    }
    .tool{
      width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--brand),#7b5cff);color:#fff;
      display:grid;place-items:center;box-shadow:0 12px 24px rgba(79,109,245,.22);border:none;cursor:pointer
    }
    .tool.secondary{background:linear-gradient(135deg,var(--brand2),#ff9c58)}
    .floating-card{
      position:fixed;left:16px;bottom:16px;z-index:40;max-width:240px;display:none;
      background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:14px
    }
    .floating-card img{border-radius:12px;margin-top:10px}
    footer{
      margin-top:16px;
      padding:22px 0 30px;
      background:#eef2fb;
      border-top:1px solid var(--line);
      color:#25314d;
    }
    footer a{color:#223b86}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px}
    .footer-small{margin-top:12px;color:#56617a;font-size:.92rem;line-height:1.7}
    .article-list{display:grid;gap:12px}
    .article{display:flex;justify-content:space-between;gap:14px;align-items:center;padding:14px 16px;border-radius:16px;background:#fff;border:1px solid var(--line)}
    .article span{color:var(--muted)}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:64px 1fr;gap:12px;align-items:start;padding:14px 16px;border-radius:16px;background:#fff;border:1px solid var(--line)}
    .timeline-item .t{font-weight:800;color:var(--brand)}
    .anchor-tags{display:flex;flex-wrap:wrap;gap:10px}
    .anchor-tags a{padding:10px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.92rem}
    .scroll-reveal{opacity:0;transform:translateY(14px);transition:.55s ease}
    .scroll-reveal.in{opacity:1;transform:none}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.form-grid,.footer-grid,.flow,.thumb-row,.mini-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-flex}
      .nav{position:relative}
      .floating-card{display:block}
    }
    @media (max-width: 640px){
      .hero{padding-top:20px}
      .hero-card{padding:20px}
      .section{padding:20px 0}
      h1{font-size:1.9rem}
      .fixed-tools{right:12px;bottom:12px}
      .tool{width:44px;height:44px}
    }