:root{
      --ink:#172235;
      --muted:#637087;
      --line:#dce4ee;
      --paper:#f5f7fb;
      --white:#fff;
      --cyan:#18b8c7;
      --blue:#3868f3;
      --violet:#7a4df4;
      --orange:#ff8f52;
      --dark:#141d34;
      --shadow:0 18px 45px rgba(34,52,88,.09);
      --container:min(1160px,calc(100% - 40px));
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",Arial,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}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(245,247,251,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(220,228,238,.8)}
    .nav{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .brand{display:flex;align-items:center;gap:11px;flex-shrink:0;font-weight:800;letter-spacing:.02em}
    .brand img{width:38px;height:38px;object-fit:contain}
    .brand span{font-size:18px}
    .nav-links{display:flex;align-items:center;gap:0;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:13px;color:#526077;padding:8px 9px;transition:.25s}
    .nav-links a:hover{color:var(--blue)}
    .nav-cta,.primary-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;background:var(--dark);color:#fff;padding:12px 18px;border-radius:6px;font-weight:700;cursor:pointer;transition:transform .25s,box-shadow .25s,background .25s}
    .nav-cta:hover,.primary-btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(20,29,52,.2);background:#26355b}
    .menu-toggle{display:none;background:transparent;border:1px solid var(--line);padding:9px 11px;border-radius:6px;color:var(--ink);font-size:18px}
    .hero{position:relative;overflow:hidden;padding:94px 0 70px;background:linear-gradient(135deg,#f5f7fb 0%,#edf4ff 53%,#f8f1ff 100%);border-bottom:1px solid var(--line)}
    .hero:before,.hero:after{content:"";position:absolute;pointer-events:none;border:1px solid rgba(56,104,243,.18);transform:rotate(28deg)}
    .hero:before{width:360px;height:360px;right:-90px;top:-160px;border-radius:50%}
    .hero:after{width:190px;height:190px;left:-100px;bottom:-80px;border-radius:28px}
    .hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.2fr .8fr;gap:70px;align-items:center}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--blue);font-weight:800;font-size:13px;letter-spacing:.08em}
    .eyebrow:before{content:"";width:24px;height:2px;background:var(--cyan)}
    h1,h2,h3,p{margin-top:0}
    h1{font-size:clamp(38px,5vw,66px);line-height:1.12;letter-spacing:0;margin:18px 0 22px;max-width:720px}
    .hero-copy{font-size:18px;color:#526077;max-width:680px}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
    .secondary-btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid #b7c7df;color:var(--blue);padding:11px 18px;border-radius:6px;font-weight:700;background:rgba(255,255,255,.45);transition:.25s}
    .secondary-btn:hover{background:#fff;transform:translateY(-2px)}
    .hero-panel{border-left:3px solid var(--cyan);padding:4px 0 4px 25px}
    .hero-panel strong{display:block;font-size:38px;line-height:1.15;color:var(--dark)}
    .hero-panel p{color:var(--muted);margin:8px 0 24px}
    .signal-list{display:grid;gap:13px}
    .signal-list div{display:flex;justify-content:space-between;gap:14px;border-bottom:1px solid rgba(142,162,194,.35);padding-bottom:10px;font-size:14px}
    .signal-list b{color:var(--blue)}
    .section{padding:88px 0}
    .section.alt{background:#eef3f9}
    .section-head{display:flex;justify-content:space-between;gap:30px;align-items:end;margin-bottom:36px}
    .section-head h2{font-size:clamp(28px,3.5vw,44px);line-height:1.2;margin:10px 0 0;letter-spacing:0}
    .section-head p{max-width:500px;color:var(--muted);margin-bottom:3px}
    .intro-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:start}
    .intro-text{font-size:18px;color:#46556d}
    .feature-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
    .feature-strip div{background:#fff;padding:25px}
    .feature-strip b{display:block;font-size:24px;color:var(--blue);margin-bottom:6px}
    .feature-strip span{font-size:14px;color:var(--muted)}
    .service-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service-card,.review-card,.case-card,.article-card,.network-card{background:#fff;border:1px solid var(--line);padding:23px;transition:transform .28s,box-shadow .28s,border-color .28s}
    .service-card:hover,.review-card:hover,.case-card:hover,.article-card:hover,.network-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#b7c9ea}
    .service-card .num{color:var(--cyan);font-size:13px;font-weight:800}
    .service-card h3{font-size:18px;margin:10px 0 8px}
    .service-card p{font-size:14px;color:var(--muted);margin:0}
    .service-card.wide{grid-column:span 2}
    .timeline{display:grid;grid-template-columns:repeat(5,1fr);border-top:2px solid #b7c9ea;gap:18px}
    .step{position:relative;padding-top:24px}
    .step:before{content:"";position:absolute;top:-10px;left:0;width:17px;height:17px;background:var(--cyan);border:4px solid var(--paper);border-radius:50%;box-shadow:0 0 0 1px var(--cyan)}
    .step strong{display:block;margin-bottom:8px}
    .step p{font-size:14px;color:var(--muted)}
    .tag-cloud{display:flex;gap:10px;flex-wrap:wrap}
    .tag{border:1px solid #bfcde1;background:#fff;padding:7px 13px;border-radius:3px;font-size:13px;color:#435372}
    .network-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
    .network-card h3{margin-bottom:12px}
    .network-card p{color:var(--muted);font-size:14px}
    .model-list{display:flex;flex-wrap:wrap;gap:8px}
    .model-list span{background:#edf3ff;color:#395bb0;padding:5px 9px;font-size:12px;border-radius:3px}
    .solution-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .solution-card{background:var(--dark);color:#fff;padding:28px;min-height:210px;position:relative;overflow:hidden}
    .solution-card:nth-child(2){background:#24527a}
    .solution-card:nth-child(3){background:#4d3988}
    .solution-card h3{font-size:21px;margin-bottom:10px}
    .solution-card p{color:#d7e1ef;font-size:14px}
    .solution-card a{color:#a9f1ed;font-weight:700;font-size:14px}
    .case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .case-card{padding:0;overflow:hidden}
    .image-wrap{aspect-ratio:16/8.5;background:#e6ecf4;overflow:hidden}
    .image-wrap img{width:100%;height:100%;object-fit:cover}
    .case-body{padding:20px}
    .case-body h3{margin-bottom:8px}
    .case-body p{font-size:14px;color:var(--muted);margin:0}
    .compare-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:26px;align-items:start}
    .score-box{background:var(--dark);color:#fff;padding:32px}
    .score-box .stars{color:#ffd166;letter-spacing:5px;font-size:24px}
    .score-box strong{display:block;font-size:58px;line-height:1.1;margin:15px 0 2px}
    .score-box p{color:#cbd6e9;margin:0}
    .table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line)}
    table{border-collapse:collapse;width:100%;min-width:620px}
    th,td{text-align:left;padding:16px;border-bottom:1px solid var(--line);font-size:14px}
    th{background:#edf3ff;color:#3155aa}
    td:last-child{color:#176b71;font-weight:700}
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .price-card{background:#fff;border-top:4px solid var(--blue);padding:25px;border-left:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
    .price-card:nth-child(2){border-top-color:var(--cyan)}
    .price-card:nth-child(3){border-top-color:var(--orange)}
    .price-card h3{margin-bottom:6px}
    .price-card p{font-size:14px;color:var(--muted)}
    .price-card strong{font-size:25px;color:var(--dark)}
    .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .review-card blockquote{margin:0 0 18px;color:#3f4e67;font-size:15px}
    .review-card footer{font-size:13px;color:var(--blue);font-weight:700}
    .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 24px}
    details{background:#fff;border:1px solid var(--line);padding:17px 19px}
    summary{cursor:pointer;font-weight:700;list-style:none;padding-right:20px;position:relative}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";position:absolute;right:0;color:var(--blue);font-size:20px;top:-3px}
    details[open] summary:after{content:"−"}
    details p{margin:12px 0 0;color:var(--muted);font-size:14px}
    .article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .article-card h3{font-size:18px;margin-bottom:8px}
    .article-card p{font-size:14px;color:var(--muted);margin-bottom:15px}
    .article-card a{color:var(--blue);font-weight:700;font-size:14px}
    .contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:30px;align-items:start}
    .contact-copy{background:var(--dark);color:#fff;padding:30px}
    .contact-copy p{color:#cfdaea}
    .contact-line{padding:13px 0;border-bottom:1px solid rgba(255,255,255,.16);font-size:14px}
    .contact-line b{color:#a9f1ed;margin-right:8px}
    form{background:#fff;border:1px solid var(--line);padding:28px;display:grid;gap:16px}
    .form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    label{display:grid;gap:7px;font-size:13px;font-weight:700;color:#41506a}
    input,select,textarea{font:inherit;border:1px solid #cbd6e5;padding:11px 12px;border-radius:4px;background:#fbfcfe;color:var(--ink);width:100%}
    textarea{min-height:120px;resize:vertical}
    .form-note{font-size:12px;color:var(--muted);margin:0}
    .footer{background:#172235;color:#dce6f4;padding:40px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1fr 1.8fr;gap:30px}
    .footer h3{color:#fff;margin:0 0 10px}
    .footer p{font-size:13px;color:#aebbd0}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px 18px}
    .footer-links a{font-size:13px;color:#cbd8eb}
    .footer-links a:hover{color:#a9f1ed}
    .copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:25px;padding-top:18px;font-size:12px;color:#99a9c1}
    .float-tools{position:fixed;right:18px;bottom:22px;z-index:15;display:grid;gap:8px}
    .float-tools a{background:#fff;border:1px solid var(--line);box-shadow:0 8px 24px rgba(28,46,77,.15);color:var(--blue);padding:10px 13px;border-radius:5px;font-size:13px;font-weight:700}
    .float-tools a:hover{background:#edf3ff}
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s ease}
    .reveal.visible{opacity:1;transform:none}
    @media(max-width:1050px){
      .nav-links a{padding:8px 5px;font-size:12px}
      .nav-cta{padding:10px 12px;font-size:12px}
      .service-grid{grid-template-columns:repeat(3,1fr)}
    }
    @media(max-width:780px){
      :root{--container:min(100% - 28px,620px)}
      .site-header{position:relative}
      .nav{min-height:68px}
      .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:grid;grid-template-columns:repeat(2,1fr)}
      .nav-links a{padding:10px;border-bottom:1px solid #edf0f5}
      .nav-cta{display:none}
      .hero{padding:62px 0 54px}
      .hero-grid,.intro-grid,.compare-layout,.contact-grid{grid-template-columns:1fr;gap:35px}
      h1{font-size:42px}
      .section{padding:62px 0}
      .section-head{display:block}
      .section-head p{margin-top:15px}
      .feature-strip,.timeline{grid-template-columns:1fr}
      .timeline{border-top:0;border-left:2px solid #b7c9ea;padding-left:20px;gap:10px}
      .step{padding:0 0 18px}
      .step:before{left:-30px;top:3px}
      .service-grid,.solution-grid,.case-grid,.review-grid,.article-grid,.price-grid{grid-template-columns:1fr 1fr}
      .service-card.wide{grid-column:auto}
      .network-grid,.faq-grid{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr}
    }
    @media(max-width:480px){
      .brand span{font-size:16px}
      .hero-actions a{width:100%}
      h1{font-size:36px}
      .service-grid,.solution-grid,.case-grid,.review-grid,.article-grid,.price-grid,.form-row{grid-template-columns:1fr}
      .score-box strong{font-size:48px}
      .float-tools{right:10px;bottom:12px}
      .float-tools a{font-size:12px;padding:8px 10px}
    }