:root{--ink:#18212b;--muted:#59636f;--paper:#f7f8fa;--white:#fff;--line:#dfe4e8;--red:#ed4a3b;--blue:#185adb;--lime:#d8f36a;--teal:#d9f2ed;--max: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,"Microsoft YaHei",sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;height:auto}
    button,input,select,textarea{font:inherit}
    .container{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
    .nav{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;white-space:nowrap}
    .ai-page-logo{display:block;width:42px;height:auto}
    .nav-links{display:flex;align-items:center;gap:0;flex-wrap:wrap}
    .nav-links a{padding:10px 9px;color:#3e4853;font-size:13px}
    .nav-links a:hover{color:var(--red)}
    .nav-cta,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;background:var(--red);color:#fff;font-weight:700;padding:12px 18px;transition:transform .2s,background .2s;cursor:pointer}
    .nav-cta:hover,.button:hover{background:#d83c30;transform:translateY(-2px)}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;padding:8px 11px;color:var(--ink)}
    .hero{overflow:hidden;position:relative;background:#f4f7fb;border-bottom:1px solid var(--line)}
    .hero:before{content:"";position:absolute;inset:0 0 auto auto;width:44%;height:100%;background:linear-gradient(135deg,transparent 0 35%,rgba(216,243,106,.85) 35% 54%,transparent 54%),linear-gradient(45deg,transparent 0 54%,rgba(237,74,59,.12) 54%);pointer-events:none}
    .hero-inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;align-items:center;gap:44px;padding-top:74px;padding-bottom:70px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:#b6372e;text-transform:uppercase;font-size:12px;font-weight:800;letter-spacing:1px}
    .eyebrow:before{content:"";width:24px;height:3px;background:var(--red)}
    h1{font-size:clamp(38px,5vw,64px);line-height:1.12;max-width:680px;margin:15px 0 18px}
    .hero-copy{max-width:620px;color:var(--muted);font-size:17px;margin:0 0 26px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px}
    .button.secondary{background:#fff;border:1px solid var(--ink);color:var(--ink)}
    .button.secondary:hover{background:var(--lime)}
    .hero-note{margin-top:20px;font-size:13px;color:var(--muted)}
    .hero-panel{position:relative;border:1px solid #d8dee5;background:#fff;padding:24px;box-shadow:10px 10px 0 var(--lime)}
    .hero-panel h2{font-size:18px;margin:0 0 16px}
    .model-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
    .model-grid span{padding:9px 8px;background:#f1f3f5;text-align:center;font-size:12px;font-weight:700}
    .hero-panel-foot{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:14px;margin-top:17px;font-size:12px;color:var(--muted)}
    .metric-strip{background:var(--ink);color:#fff}
    .metrics{display:grid;grid-template-columns:repeat(4,1fr);padding:22px 0}
    .metric{padding:4px 20px;border-right:1px solid #45505b}
    .metric:first-child{padding-left:0}
    .metric:last-child{border:0}
    .metric strong{display:block;color:var(--lime);font-size:20px}
    .metric span{font-size:12px;color:#d2d9de}
    .section{padding:76px 0}
    .section.tinted{background:#fff}
    .section-head{max-width:720px;margin-bottom:30px}
    .section-kicker{font-size:12px;color:#b6372e;font-weight:800;text-transform:uppercase}
    h2{font-size:clamp(27px,3.2vw,40px);line-height:1.2;margin:8px 0 12px}
    .section-head p{color:var(--muted);margin:0}
    .intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
    .intro-copy{font-size:16px;color:var(--muted)}
    .intro-copy strong{color:var(--ink)}
    .capability-list{display:grid;grid-template-columns:1fr 1fr;gap:0 20px;border-top:1px solid var(--line)}
    .capability-list div{padding:15px 0;border-bottom:1px solid var(--line);font-weight:700}
    .capability-list small{display:block;color:var(--muted);font-weight:400;font-size:13px}
    .service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .service{background:#fff;border:1px solid var(--line);padding:20px;transition:transform .2s,border-color .2s}
    .service:hover{transform:translateY(-4px);border-color:var(--red)}
    .service .num{font-size:12px;color:var(--red);font-weight:800}
    .service h3{margin:8px 0;font-size:18px}
    .service p{margin:0;color:var(--muted);font-size:14px}
    .service-link{display:inline-block;margin-top:13px;color:var(--blue);font-size:13px;font-weight:700}
    .chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
    .chips span{padding:7px 11px;background:var(--teal);font-size:12px;font-weight:700}
    .production{display:grid;grid-template-columns:1fr 1fr;gap:28px}
    .production-copy{padding:8px 0}
    .production-copy ul{padding-left:20px;color:var(--muted)}
    .production-copy li{margin:8px 0}
    .media-stack{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:start}
    .media-stack figure{margin:0;background:#fff;border:1px solid var(--line);padding:8px}
    .media-stack figure:first-child{grid-column:1/-1}
    .media-stack img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
    .media-stack figure:last-child img{aspect-ratio:1/1}
    .media-stack figcaption{padding:8px 4px 2px;font-size:12px;color:var(--muted)}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:2px solid var(--ink)}
    .step{padding:20px 18px 10px 0}
    .step b{display:block;color:var(--red);font-size:13px}
    .step h3{font-size:17px;margin:8px 0}
    .step p{font-size:13px;color:var(--muted);margin:0}
    .industry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
    .industry{padding:17px;background:#f0f2f3;border-left:3px solid var(--blue);font-weight:700}
    .industry small{display:block;color:var(--muted);font-weight:400;margin-top:5px}
    .network-band{background:var(--lime);padding:27px 30px;display:flex;align-items:center;justify-content:space-between;gap:30px}
    .network-band h3{margin:0 0 5px;font-size:21px}
    .network-band p{margin:0;color:#3d4930}
    .rating-layout{display:grid;grid-template-columns:.65fr 1.35fr;gap:30px;align-items:start}
    .rating{background:var(--red);color:#fff;padding:26px}
    .rating strong{display:block;font-size:52px;line-height:1}
    .stars{color:var(--lime);font-size:22px;letter-spacing:2px;margin:10px 0}
    .rating p{margin:0;font-size:13px}
    .table-wrap{overflow-x:auto;border:1px solid var(--line);background:#fff}
    table{border-collapse:collapse;width:100%;min-width:620px;text-align:left}
    th,td{padding:13px 15px;border-bottom:1px solid var(--line);font-size:13px}
    th{background:#edf0f2}
    td:last-child{font-weight:700;color:#14755f}
    .case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .case{background:#fff;border:1px solid var(--line)}
    .case img{display:block;width:100%;aspect-ratio:16/10;object-fit:cover}
    .case-body{padding:17px}
    .case-body h3{margin:0 0 6px;font-size:17px}
    .case-body p{margin:0;color:var(--muted);font-size:13px}
    .quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    blockquote{margin:0;padding:19px;background:#fff;border-top:3px solid var(--blue)}
    blockquote p{margin:0 0 14px;font-size:14px}
    blockquote footer{font-size:12px;color:var(--muted)}
    .match-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:40px;align-items:start}
    .match-aside{background:var(--ink);color:#fff;padding:26px}
    .match-aside h3{font-size:22px;margin:0 0 12px}
    .match-aside p{color:#d8dfe5;font-size:14px}
    .contact-lines{margin-top:20px;border-top:1px solid #47515b;padding-top:15px;font-size:13px}
    .contact-lines a{color:var(--lime)}
    form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .field{display:flex;flex-direction:column;gap:6px}
    .field.full{grid-column:1/-1}
    label{font-size:13px;font-weight:700}
    input,select,textarea{width:100%;padding:11px 12px;border:1px solid #cbd2d8;background:#fff;color:var(--ink);border-radius:0}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{outline:2px solid var(--blue);outline-offset:1px}
    .form-note{grid-column:1/-1;color:var(--muted);font-size:12px;margin:0}
    .faq-list{border-top:1px solid var(--line)}
    details{border-bottom:1px solid var(--line)}
    summary{cursor:pointer;list-style:none;padding:17px 36px 17px 0;font-weight:700;position:relative}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";position:absolute;right:4px;top:13px;font-size:22px;color:var(--red)}
    details[open] summary:after{content:"−"}
    details p{max-width:820px;color:var(--muted);margin:0;padding:0 30px 17px 0;font-size:14px}
    .article-links{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
    .article-links a{background:#fff;padding:15px;border:1px solid var(--line);font-weight:700;font-size:13px}
    .article-links a:hover{border-color:var(--red)}
    .join-band{background:#dff1ed;padding:28px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .join-band h3{margin:0 0 5px;font-size:22px}
    .join-band p{margin:0;color:var(--muted)}
    .site-footer{background:#e9edf0;color:var(--ink);border-top:1px solid var(--line);padding:30px 0 22px}
    .footer-top{display:flex;justify-content:space-between;align-items:start;gap:28px}
    .footer-links{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13px}
    .footer-links a:hover{color:var(--red)}
    .footer-bottom{border-top:1px solid #cfd6dc;margin-top:22px;padding-top:14px;color:#53606b;font-size:12px;display:flex;justify-content:space-between;gap:16px}
    .float-contact{position:fixed;right:18px;bottom:20px;z-index:15;display:flex;flex-direction:column;gap:8px}
    .float-contact a,.to-top{background:var(--ink);color:#fff;padding:10px 13px;font-size:12px;text-align:center;border:0;cursor:pointer}
    .float-contact a:hover,.to-top:hover{background:var(--red)}
    .reveal{opacity:0;transform:translateY(12px);transition:opacity .5s,transform .5s}
    .reveal.visible{opacity:1;transform:translateY(0)}
    @media(max-width:940px){
      .nav-links a{padding:8px 6px;font-size:12px}
      .nav-cta{display:none}
      .hero-inner{grid-template-columns:1fr .8fr}
      .service-grid{grid-template-columns:repeat(2,1fr)}
      .industry-grid{grid-template-columns:repeat(2,1fr)}
      .article-links{grid-template-columns:repeat(3,1fr)}
    }
    @media(max-width:720px){
      .container{width:min(var(--max),calc(100% - 30px))}
      .nav{min-height:66px}
      .menu-toggle{display:block}
      .nav-links{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:10px 15px 15px;align-items:stretch;max-height:70vh;overflow:auto}
      .nav-links.open{display:grid;grid-template-columns:repeat(2,1fr)}
      .nav-links a{font-size:14px;padding:10px}
      .hero-inner{grid-template-columns:1fr;padding-top:54px;padding-bottom:46px;gap:28px}
      .hero:before{width:70%;opacity:.7}
      h1{font-size:43px}
      .hero-copy{font-size:15px}
      .hero-panel{max-width:520px}
      .metrics{grid-template-columns:repeat(2,1fr);gap:15px}
      .metric{padding:0 12px;border-right:0}
      .metric:nth-child(odd){padding-left:0}
      .section{padding:56px 0}
      .intro-grid,.production,.rating-layout,.match-grid{grid-template-columns:1fr;gap:24px}
      .service-grid{grid-template-columns:1fr}
      .steps{grid-template-columns:repeat(2,1fr)}
      .case-grid,.quote-grid{grid-template-columns:1fr 1fr}
      .network-band,.join-band{align-items:flex-start;flex-direction:column}
      .article-links{grid-template-columns:repeat(2,1fr)}
      .footer-top,.footer-bottom{flex-direction:column}
      .float-contact{right:10px;bottom:10px}
      .float-contact a{padding:9px 10px}
    }
    @media(max-width:460px){
      h1{font-size:37px}
      .capability-list{grid-template-columns:1fr}
      .steps,.case-grid,.quote-grid,.industry-grid{grid-template-columns:1fr}
      form{grid-template-columns:1fr}
      .field.full,.form-note{grid-column:auto}
      .article-links{grid-template-columns:1fr 1fr}
      .hero-actions .button{width:100%}
    }
    @media(prefers-reduced-motion:reduce){
      *,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
      .reveal{opacity:1;transform:none}
    }