:root{--ink:#20231f;--muted:#64685f;--yellow:#f5c400;--yellow-light:#fff4bd;--paper:#fffdf5;--line:#e7e4d9;--green:#24594a;--white:#fff;--container:1160px}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth;scroll-padding-top:88px}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    button,input,select,textarea{font:inherit}
    img{max-width:100%;height:auto}
    .container{width:min(var(--container),calc(100% - 40px));margin-inline:auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(255,253,245,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
    .nav-bar{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .brand{display:flex;align-items:center;gap:10px;flex:none;font-weight:800}
    .ai-page-logo{width:40px;max-height:40px;object-fit:contain}
    .nav-links{display:flex;align-items:center;justify-content:flex-end;gap:0;flex-wrap:wrap}
    .nav-links a{padding:8px 9px;font-size:13px;color:#45483f;white-space:nowrap}
    .nav-links a:hover{color:#987500}
    .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 18px;border:1px solid var(--ink);background:var(--ink);color:var(--white);font-weight:700;transition:transform .2s,background .2s,box-shadow .2s}
    .nav-cta{flex:none;padding:10px 15px;font-size:13px}
    .button:hover,.nav-cta:hover{transform:translateY(-2px);box-shadow:0 8px 20px #20231f20}
    .button-yellow{background:var(--yellow);border-color:var(--yellow);color:var(--ink)}
    .button-outline{background:transparent;color:var(--ink)}
    .menu-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);background:var(--white);color:var(--ink);font-size:21px}
    .hero{position:relative;overflow:hidden;background:var(--yellow);border-bottom:1px solid #d8ae00}
    .hero:after{content:"";position:absolute;width:360px;height:360px;right:-90px;top:-160px;border:1px solid #20231f26;border-radius:50%;box-shadow:0 0 0 42px #20231f08,0 0 0 84px #20231f06;pointer-events:none}
    .hero-inner{position:relative;z-index:1;padding:76px 0 58px}
    .eyebrow{margin:0 0 14px;font-size:12px;font-weight:800;letter-spacing:1px;text-transform:uppercase}
    h1{max-width:760px;margin:0;font-size:clamp(38px,7vw,72px);line-height:1.08;letter-spacing:-1px}
    .hero-copy{max-width:640px;margin:22px 0 26px;font-size:18px;color:#303126}
    .actions{display:flex;gap:12px;flex-wrap:wrap}
    .hero-note{margin-top:24px;font-size:13px;color:#4f4619}
    .hero-mark{position:absolute;right:8%;bottom:10%;width:150px;height:150px;border:1px solid #20231f50;border-radius:50%;display:grid;place-items:center;font-size:42px;font-weight:800;transform:rotate(-12deg)}
    .hero-mark:before{content:"";position:absolute;inset:14px;border:1px dashed #20231f70;border-radius:50%}
    .metrics{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line);background:#fff}
    .metric{padding:22px 18px;border-right:1px solid var(--line)}
    .metric:last-child{border:0}
    .metric strong{display:block;font-size:21px}
    .metric span{font-size:13px;color:var(--muted)}
    section{padding:66px 0}
    .section-head{max-width:720px;margin-bottom:30px}
    .section-head h2{margin:0 0 10px;font-size:32px;line-height:1.2}
    .section-head p{margin:0;color:var(--muted)}
    .section-kicker{display:block;margin-bottom:10px;color:#8a7000;font-size:12px;font-weight:800}
    .intro-band{background:#fff;border-bottom:1px solid var(--line)}
    .intro-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
    .intro-copy{font-size:17px}
    .intro-copy p{margin:0 0 14px}
    .capability-list{display:grid;grid-template-columns:1fr 1fr;gap:0 24px;margin:0;padding:0;list-style:none}
    .capability-list li{padding:13px 0;border-bottom:1px solid var(--line);font-weight:700}
    .capability-list li:before{content:"+";margin-right:10px;color:#9a7900}
    .service-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .service{min-height:150px;padding:20px;background:#fff;border:1px solid var(--line);transition:transform .2s,border-color .2s,box-shadow .2s}
    .service:hover,.quote:hover{transform:translateY(-3px);border-color:#d2ad13;box-shadow:0 12px 24px #403b2010}
    .service h3{margin:0 0 8px;font-size:18px}
    .service p{margin:0;color:var(--muted);font-size:14px}
    .service .tag{display:inline-block;margin-top:14px;padding:3px 8px;background:var(--yellow-light);font-size:12px}
    .flow{background:#f5f2e6}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid #cbc7b8;border-bottom:1px solid #cbc7b8}
    .step{padding:22px 18px 24px;border-right:1px solid #cbc7b8}
    .step:last-child{border:0}
    .step b{display:block;margin-bottom:9px;color:#8a7000;font-size:13px}
    .step h3{margin:0 0 7px;font-size:17px}
    .step p{margin:0;color:var(--muted);font-size:14px}
    .industry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
    .industry{padding:18px;background:#fff}
    .industry h3{margin:0 0 6px;font-size:16px}
    .industry p{margin:0;color:var(--muted);font-size:13px}
    .network{background:var(--green);color:#fff}
    .network .section-kicker{color:#f7d84a}
    .network .section-head p{color:#dbe8df}
    .network-content{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:start}
    .model-cloud{display:flex;flex-wrap:wrap;gap:8px}
    .model-cloud span{padding:7px 11px;border:1px solid #ffffff54;color:#fff;font-size:13px}
    .network-note{padding:20px;border-left:3px solid var(--yellow);background:#ffffff0d}
    .network-note p{margin:0 0 12px;color:#edf1e9}
    .network-note p:last-child{margin-bottom:0}
    .case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .case{border:1px solid var(--line);background:#fff}
    .image-frame{aspect-ratio:16/9;overflow:hidden;background:#eee}
    .image-frame img{display:block;width:100%;height:100%;object-fit:cover}
    .case-copy{padding:17px}
    .case-copy h3{margin:0 0 7px;font-size:17px}
    .case-copy p{margin:0;color:var(--muted);font-size:14px}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .quote{padding:20px;border:1px solid var(--line);background:#fff;transition:transform .2s,box-shadow .2s}
    .quote blockquote{margin:0 0 16px;font-size:15px}
    .quote cite{font-size:13px;color:var(--muted);font-style:normal}
    .rating-band{display:flex;justify-content:space-between;align-items:center;gap:25px;margin-bottom:20px;padding:20px 24px;background:var(--yellow)}
    .rating-band strong{font-size:24px}
    .rating-band span{font-size:14px}
    .table-wrap{overflow-x:auto;border:1px solid var(--line);background:#fff}
    table{width:100%;min-width:700px;border-collapse:collapse;text-align:left}
    th,td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
    th{background:#f7f4e9;font-size:14px}
    td{font-size:14px}
    tr:last-child td{border-bottom:0}
    .positive{font-weight:700;color:var(--green)}
    .pricing{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;padding:26px;background:#fff;border:1px solid var(--line)}
    .pricing h3{margin:0 0 9px;font-size:22px}
    .pricing p{margin:0;color:var(--muted)}
    .price-callout{padding:18px;background:var(--yellow-light)}
    .price-callout strong{display:block;font-size:20px}
    .price-callout span{font-size:13px;color:var(--muted)}
    .faq-list{border-top:1px solid var(--line)}
    details{border-bottom:1px solid var(--line)}
    summary{position:relative;padding:17px 36px 17px 0;font-weight:700;cursor:pointer;list-style:none}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";position:absolute;right:4px;font-size:22px;font-weight:400}
    details[open] summary:after{content:"−"}
    details p{max-width:820px;margin:0;padding:0 20px 18px 0;color:var(--muted)}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .article-link{display:block;padding:17px;border-bottom:2px solid var(--yellow);background:#fff}
    .article-link span{display:block;margin-top:6px;color:var(--muted);font-size:13px;overflow-wrap:anywhere}
    .contact{background:#f1eedf}
    .contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:34px;align-items:start}
    .contact-details p{margin:0 0 12px}
    .qr-frame{width:150px;margin-top:20px;padding:8px;background:#fff;border:1px solid var(--line)}
    .qr-frame img{display:block;width:100%;height:auto}
    form{display:grid;grid-template-columns:1fr 1fr;gap:13px;padding:22px;background:#fff;border:1px solid var(--line)}
    label{display:grid;gap:6px;font-size:13px;font-weight:700}
    input,select,textarea{width:100%;padding:11px 12px;border:1px solid #d8d5c8;background:#fff;color:var(--ink);border-radius:0}
    textarea{min-height:112px;resize:vertical}
    .full{grid-column:1/-1}
    .form-note{margin:0;color:var(--muted);font-size:12px}
    .footer{padding:28px 0;background:#fff;border-top:1px solid var(--line);color:var(--ink)}
    .footer-top{display:flex;justify-content:space-between;align-items:start;gap:25px}
    .footer-links{display:flex;flex-wrap:wrap;gap:8px 16px;max-width:700px;font-size:13px}
    .footer-links a:hover{text-decoration:underline}
    .copyright{margin:18px 0 0;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:#60635b}
    .floating{position:fixed;right:18px;bottom:18px;z-index:15;display:grid;gap:8px}
    .floating a,.back-top{display:grid;place-items:center;width:46px;height:46px;border:1px solid var(--ink);background:var(--yellow);color:var(--ink);font-size:13px;font-weight:800}
    .back-top{cursor:pointer}
    .reveal{opacity:0;transform:translateY(14px);transition:opacity .55s ease,transform .55s ease}
    .reveal.is-visible{opacity:1;transform:translateY(0)}
    @media(max-width:960px){
      .nav-links{gap:0}
      .nav-links a{padding:7px 6px;font-size:12px}
      .nav-cta{display:none}
      .service-grid{grid-template-columns:repeat(2,1fr)}
      .industry-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:720px){
      .container{width:min(var(--container),calc(100% - 32px))}
      .nav-bar{min-height:64px}
      .menu-toggle{display:block}
      .nav-links{display:none;position:absolute;top:64px;left:0;right:0;padding:10px 16px 16px;background:var(--paper);border-bottom:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));max-height:70vh;overflow:auto}
      .nav-links.open{display:grid}
      .nav-links a{padding:10px;font-size:14px}
      .hero-inner{padding:58px 0 48px}
      .hero-mark{right:4%;bottom:12%;width:90px;height:90px;font-size:27px;opacity:.55}
      .metrics{grid-template-columns:1fr 1fr}
      .metric:nth-child(2){border-right:0}
      .metric:nth-child(-n+2){border-bottom:1px solid var(--line)}
      section{padding:48px 0}
      .section-head h2{font-size:27px}
      .intro-grid,.network-content,.contact-grid,.pricing{grid-template-columns:1fr;gap:22px}
      .steps{grid-template-columns:1fr 1fr}
      .step:nth-child(2){border-right:0}
      .step:nth-child(-n+2){border-bottom:1px solid #cbc7b8}
      .case-grid,.reviews,.articles{grid-template-columns:1fr 1fr}
      .footer-top{flex-direction:column}
    }
    @media(max-width:480px){
      h1{font-size:40px}
      .hero-copy{font-size:16px}
      .service-grid,.industry-grid,.case-grid,.reviews,.articles{grid-template-columns:1fr}
      .capability-list{grid-template-columns:1fr}
      .steps{grid-template-columns:1fr}
      .step,.step:nth-child(2){border-right:0;border-bottom:1px solid #cbc7b8}
      .step:last-child{border-bottom:0}
      .rating-band{align-items:flex-start;flex-direction:column;gap:5px}
      form{grid-template-columns:1fr}
      .full{grid-column:auto}
    }
    @media(prefers-reduced-motion:reduce){
      *,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
      .reveal{opacity:1;transform:none}
    }