:root{
      --ink:#17212b;
      --muted:#5f6d79;
      --paper:#fffdf8;
      --soft:#f4f7f5;
      --line:#dce5df;
      --coral:#ff684d;
      --yellow:#ffd43d;
      --teal:#087f8c;
      --blue:#2457d6;
      --violet:#6452c8;
      --green:#138a64;
      --shadow:0 14px 34px rgba(23,33,43,.09);
      --radius:10px;
      --container:min(1180px,calc(100% - 40px));
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--paper);
      font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;
      line-height:1.7;
    }
    a{color:inherit;text-decoration:none}
    img{max-width:100%;height:auto;display:block}
    .container{width:var(--container);margin:0 auto}
    .topbar{
      background:#17212b;
      color:#fff;
      font-size:13px;
      padding:8px 0;
    }
    .topbar-inner{display:flex;justify-content:space-between;gap:18px;align-items:center}
    .topbar a{color:#ffd43d}
    header{
      background:var(--paper);
      border-bottom:1px solid var(--line);
      position:sticky;
      top:0;
      z-index:20;
    }
    .nav-wrap{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .brand{display:flex;align-items:center;gap:12px;min-width:160px}
    .ai-page-logo{width:132px}
    .brand-text{font-size:13px;color:var(--muted);border-left:1px solid var(--line);padding-left:12px}
    .nav-links{display:flex;align-items:center;gap:0;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;font-weight:700;padding:9px 11px;border-bottom:2px solid transparent}
    .nav-links a:hover{color:var(--coral);border-color:var(--coral)}
    .nav-cta{background:var(--coral);color:#fff!important;border-radius:6px;margin-left:10px;padding:10px 16px!important;border:0!important}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:6px;padding:8px 11px;font-size:20px}
    .hero{
      position:relative;
      overflow:hidden;
      background:#fff7d6;
      border-bottom:1px solid #f1df9b;
    }
    .hero:before,.hero:after{content:"";position:absolute;display:block}
    .hero:before{width:210px;height:210px;background:var(--coral);right:7%;top:-110px;border-radius:50%}
    .hero:after{width:130px;height:130px;background:var(--teal);left:-48px;bottom:-52px;transform:rotate(18deg)}
    .hero-inner{min-height:610px;display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:60px;position:relative;z-index:1;padding:76px 0 72px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;font-weight:800;color:var(--teal);letter-spacing:1px;font-size:13px}
    .eyebrow:before{content:"";width:28px;height:4px;background:var(--coral);display:inline-block}
    h1,h2,h3{line-height:1.2;margin:0 0 18px}
    h1{font-size:clamp(38px,5vw,68px);letter-spacing:0;max-width:680px}
    h2{font-size:clamp(28px,4vw,44px)}
    h3{font-size:21px}
    .hero-copy{font-size:18px;color:#41505c;max-width:620px;margin:0 0 28px}
    .actions{display:flex;flex-wrap:wrap;gap:12px}
    .btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:6px;padding:13px 21px;font-weight:800;cursor:pointer;transition:.2s ease;min-height:46px}
    .btn:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(23,33,43,.16)}
    .btn-primary{background:var(--coral);color:#fff}
    .btn-dark{background:var(--ink);color:#fff}
    .btn-light{background:#fff;color:var(--ink);border:1px solid var(--line)}
    .hero-panel{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .metric{padding:22px;background:#fff;border:2px solid var(--ink);box-shadow:8px 8px 0 var(--yellow);border-radius:8px}
    .metric:nth-child(2){box-shadow:8px 8px 0 var(--coral);margin-top:30px}
    .metric:nth-child(3){box-shadow:8px 8px 0 var(--teal)}
    .metric:nth-child(4){box-shadow:8px 8px 0 var(--violet);margin-top:30px}
    .metric strong{font-size:30px;display:block}
    .metric span{font-size:13px;color:var(--muted)}
    section{padding:92px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:36px}
    .section-head p{max-width:540px;color:var(--muted);margin:0}
    .kicker{color:var(--coral);font-weight:800;font-size:14px;letter-spacing:1px;text-transform:uppercase}
    .intro{background:#f4f7f5}
    .intro-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:52px;align-items:start}
    .intro-text p{color:var(--muted);font-size:17px}
    .highlight-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .highlight{background:#fff;border-left:5px solid var(--teal);padding:20px;border-radius:6px;box-shadow:var(--shadow)}
    .highlight:nth-child(2){border-color:var(--coral)}
    .highlight:nth-child(3){border-color:var(--yellow)}
    .highlight:nth-child(4){border-color:var(--blue)}
    .highlight b{display:block;margin-bottom:5px}
    .highlight span{font-size:14px;color:var(--muted)}
    .services{background:#fff}
    .service-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service-card{padding:24px 20px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;transition:.25s ease}
    .service-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--coral)}
    .service-icon{width:42px;height:42px;display:grid;place-items:center;background:var(--yellow);border-radius:50%;font-weight:900;margin-bottom:17px}
    .service-card:nth-child(2) .service-icon{background:#bcebe2}
    .service-card:nth-child(3) .service-icon{background:#ffd4ca}
    .service-card:nth-child(4) .service-icon{background:#d9d3ff}
    .service-card p{font-size:14px;color:var(--muted);margin:0}
    .workflow{background:#17212b;color:#fff}
    .workflow .section-head p{color:#c8d2d9}
    .workflow .kicker{color:var(--yellow)}
    .steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:1px solid #58636c}
    .step{padding:26px 18px 10px;border-right:1px solid #58636c;position:relative}
    .step:last-child{border-right:0}
    .step-number{color:var(--yellow);font-size:14px;font-weight:900}
    .step p{font-size:14px;color:#c8d2d9}
    .network{background:#fff7d6}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
    .tag{padding:8px 13px;background:#fff;border:1px solid #e7dca5;border-radius:5px;font-size:14px}
    .tag:nth-child(3n){background:#ffd4ca}
    .tag:nth-child(4n){background:#bcebe2}
    .solutions{background:#f4f7f5}
    .solution-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .solution{background:#fff;padding:24px;border-top:5px solid var(--coral);box-shadow:0 5px 0 #e0e9e3}
    .solution:nth-child(2){border-color:var(--teal)}
    .solution:nth-child(3){border-color:var(--blue)}
    .solution:nth-child(4){border-color:var(--yellow)}
    .solution:nth-child(5){border-color:var(--violet)}
    .solution:nth-child(6){border-color:var(--green)}
    .solution p{color:var(--muted);font-size:14px;margin:0}
    .timeline{background:#fff}
    .timeline-list{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
    .timeline-item{padding:22px;border:1px solid var(--line);position:relative}
    .timeline-item:before{content:"";display:block;width:14px;height:14px;background:var(--coral);margin-bottom:20px}
    .timeline-item:nth-child(2):before{background:var(--yellow)}
    .timeline-item:nth-child(3):before{background:var(--teal)}
    .timeline-item:nth-child(4):before{background:var(--blue)}
    .timeline-item p{color:var(--muted);font-size:14px;margin:0}
    .case-section{background:#f4f7f5}
    .case-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px}
    .case-feature{background:#fff;padding:28px;display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center}
    .case-feature img{width:100%;aspect-ratio:4/3;object-fit:cover}
    .case-feature p,.case-side p{color:var(--muted);font-size:14px}
    .case-side{display:grid;gap:16px}
    .case-side article{background:#fff;padding:22px;border-left:4px solid var(--teal)}
    .case-side article:nth-child(2){border-color:var(--coral)}
    .compare{background:#fff7d6}
    .score-box{display:flex;align-items:center;gap:24px;background:var(--ink);color:#fff;padding:25px;margin-bottom:24px;border-radius:8px}
    .score-box strong{font-size:42px;color:var(--yellow)}
    .stars{color:var(--yellow);font-size:22px;letter-spacing:2px}
    .table-wrap{overflow-x:auto;background:#fff;border:1px solid #e9ddb0}
    table{width:100%;border-collapse:collapse;min-width:720px}
    th,td{text-align:left;padding:15px 17px;border-bottom:1px solid var(--line);font-size:14px}
    th{background:#17212b;color:#fff}
    td:nth-child(2){font-weight:800;color:var(--teal)}
    .pricing{background:#fff}
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .price-card{border:1px solid var(--line);padding:28px;background:#fff}
    .price-card.featured{border:2px solid var(--coral);box-shadow:var(--shadow);transform:translateY(-8px)}
    .price-card strong{font-size:30px;display:block;margin:15px 0}
    .price-card p{font-size:14px;color:var(--muted)}
    .price-card ul{padding-left:18px;color:var(--muted);font-size:14px}
    .reviews{background:#f4f7f5}
    .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review{background:#fff;padding:24px;border-bottom:4px solid var(--yellow)}
    .review:nth-child(2n){border-color:var(--coral)}
    .review:nth-child(3n){border-color:var(--teal)}
    .review p{margin:0 0 18px;font-size:15px}
    .review b{font-size:14px}
    .review span{display:block;color:var(--muted);font-size:13px}
    .articles{background:#fff}
    .article-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .article{display:flex;justify-content:space-between;gap:20px;padding:19px 0;border-bottom:1px solid var(--line)}
    .article a{font-weight:800}
    .article span{color:var(--coral);font-size:13px;white-space:nowrap}
    .faq{background:#f4f7f5}
    .faq-list{max-width:900px;margin:0 auto}
    details{background:#fff;border:1px solid var(--line);margin-bottom:10px}
    summary{cursor:pointer;padding:18px 22px;font-weight:800;list-style:none;display:flex;justify-content:space-between;gap:15px}
    summary:after{content:"+";color:var(--coral);font-size:22px;line-height:1}
    details[open] summary:after{content:"−"}
    details p{padding:0 22px 18px;margin:0;color:var(--muted);font-size:14px}
    .contact{background:#fff7d6}
    .contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:50px;align-items:start}
    .contact-info p{color:var(--muted)}
    .contact-list{padding:0;list-style:none}
    .contact-list li{padding:9px 0;border-bottom:1px solid #e9ddb0}
    .form{background:#fff;padding:28px;box-shadow:var(--shadow)}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    label{display:block;font-weight:700;font-size:14px}
    input,select,textarea{display:block;width:100%;border:1px solid #cbd7d0;border-radius:5px;padding:12px;margin-top:6px;background:#fff;font:inherit;color:var(--ink)}
    textarea{min-height:125px;resize:vertical}
    .full{grid-column:1/-1}
    .form button{margin-top:18px}
    .join{background:#17212b;color:#fff;padding:62px 0}
    .join-inner{display:flex;justify-content:space-between;align-items:center;gap:30px}
    .join p{color:#c8d2d9;margin:0;max-width:620px}
    footer{background:#101820;color:#d5dee3;padding:48px 0 25px}
    .footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:35px}
    footer h3{font-size:17px;color:#fff}
    footer p,footer li,footer a{font-size:14px;color:#aebbc2}
    footer ul{list-style:none;padding:0;margin:0}
    footer li{margin:7px 0}
    footer a:hover{color:var(--yellow)}
    .qr{width:112px;margin-top:10px}
    .copyright{border-top:1px solid #34414a;margin-top:30px;padding-top:18px;font-size:13px;color:#86949d}
    .float-contact{position:fixed;right:20px;bottom:22px;z-index:15;background:var(--coral);color:#fff;border-radius:50%;width:58px;height:58px;display:grid;place-items:center;font-weight:900;box-shadow:0 8px 20px rgba(23,33,43,.24)}
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
    .reveal.visible{opacity:1;transform:none}
    @media(max-width:1050px){
      .nav-links a{padding:8px 7px;font-size:13px}
      .service-grid{grid-template-columns:repeat(2,1fr)}
      .hero-inner{gap:35px}
    }
    @media(max-width:780px){
      :root{--container:min(100% - 28px,680px)}
      .topbar-inner{display:block;text-align:center}
      .topbar-inner span{display:block}
      .nav-wrap{min-height:68px}
      .brand-text{display:none}
      .menu-toggle{display:block}
      .nav-links{display:none;position:absolute;left:14px;right:14px;top:68px;background:#fff;border:1px solid var(--line);padding:10px;box-shadow:var(--shadow);align-items:stretch}
      .nav-links.open{display:flex;flex-direction:column}
      .nav-links a{padding:11px 12px}
      .nav-cta{margin:5px 0 0}
      .hero-inner,.intro-grid,.case-grid,.contact-grid{grid-template-columns:1fr}
      .hero-inner{min-height:auto;padding:64px 0 70px}
      .hero-panel{margin-top:10px}
      section{padding:64px 0}
      .section-head{display:block}
      .section-head p{margin-top:14px}
      .service-grid,.solution-grid,.review-grid,.timeline-list,.price-grid{grid-template-columns:1fr 1fr}
      .steps{grid-template-columns:1fr 1fr;border-top:0}
      .step{border-top:1px solid #58636c}
      .step:nth-child(2n){border-right:0}
      .case-feature{grid-template-columns:1fr}
      .article-grid{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr}
      .join-inner{display:block}
      .join-inner .btn{margin-top:22px}
    }
    @media(max-width:480px){
      h1{font-size:40px}
      .hero-panel,.highlight-list,.service-grid,.solution-grid,.review-grid,.timeline-list,.price-grid,.footer-grid{grid-template-columns:1fr}
      .metric:nth-child(2),.metric:nth-child(4){margin-top:0}
      .score-box{display:block}
      .score-box strong{display:block}
      .form-grid{grid-template-columns:1fr}
      .full{grid-column:auto}
    }