:root{
      --ink:#14243b;
      --muted:#617086;
      --blue:#1769e0;
      --cyan:#08a9c7;
      --lime:#c5e86c;
      --yellow:#ffd76a;
      --paper:#f6fbff;
      --white:#fff;
      --line:#dce8f2;
      --shadow:0 18px 45px rgba(31,83,129,.11);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);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:min(1180px,calc(100% - 36px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(246,251,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,232,242,.85)}
    .nav-bar{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
    .ai-page-logo{width:42px;max-height:42px;object-fit:contain}
    .brand-name{font-weight:800;font-size:18px;letter-spacing:0}
    .brand-sub{font-size:11px;color:var(--muted);display:block;line-height:1.2}
    .nav-links{display:flex;align-items:center;justify-content:flex-end;gap:0;flex-wrap:wrap}
    .nav-links a{padding:8px 10px;font-size:13px;color:#43556d;transition:.2s}
    .nav-links a:hover{color:var(--blue)}
    .nav-cta{background:var(--blue);color:#fff!important;border-radius:9px!important;margin-left:10px;padding:10px 15px!important}
    .menu-toggle{display:none;border:0;background:transparent;color:var(--ink);font-size:25px;cursor:pointer}
    .hero{position:relative;overflow:hidden;padding:86px 0 72px;background:linear-gradient(135deg,#f4fbff 0%,#fff 55%,#f0f9e9 100%)}
    .hero:before,.hero:after{content:"";position:absolute;border:1px solid rgba(23,105,224,.13);border-radius:50%;pointer-events:none}
    .hero:before{width:430px;height:430px;right:-170px;top:-180px}
    .hero:after{width:250px;height:250px;left:-140px;bottom:-140px}
    .hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:58px;align-items:center;position:relative;z-index:1}
    .eyebrow,.section-kicker{font-size:12px;font-weight:800;letter-spacing:2px;color:var(--blue);text-transform:uppercase}
    h1{font-size:clamp(38px,6vw,70px);line-height:1.12;letter-spacing:0;margin:14px 0 20px;max-width:720px}
    .hero-copy{font-size:19px;color:#52647b;max-width:650px;margin:0 0 30px}
    .button-row{display:flex;flex-wrap:wrap;gap:12px}
    .button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 21px;border-radius:10px;border:1px solid transparent;font-weight:700;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s}
    .button:hover{transform:translateY(-3px);box-shadow:0 9px 20px rgba(23,105,224,.18)}
    .button-primary{background:var(--blue);color:#fff}
    .button-secondary{background:#fff;border-color:var(--line);color:var(--ink)}
    .hero-panel{padding:25px;border:1px solid #cfe0ed;background:#fff;box-shadow:var(--shadow);border-radius:22px}
    .signal-line{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:12px 0;font-size:14px}
    .signal-line:last-child{border-bottom:0}
    .signal-value{font-weight:800;color:var(--blue)}
    .signal-bar{height:8px;background:#e9f1f6;border-radius:9px;margin-top:20px;overflow:hidden}
    .signal-bar span{display:block;width:86%;height:100%;background:linear-gradient(90deg,var(--cyan),var(--blue),var(--lime));border-radius:9px}
    section{padding:84px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:34px}
    h2{font-size:clamp(28px,4vw,44px);line-height:1.2;margin:8px 0 0;letter-spacing:0}
    h3{font-size:19px;line-height:1.35;margin:0 0 10px}
    .section-intro{max-width:620px;color:var(--muted);margin:0}
    .soft-band{background:#edf8fb}
    .about-grid,.split-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
    .lead-box{border-left:5px solid var(--cyan);padding:8px 0 8px 23px;font-size:22px;font-weight:700;line-height:1.5}
    .plain-copy{color:var(--muted);font-size:16px}
    .metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:38px}
    .metric{background:#fff;border:1px solid var(--line);padding:22px;border-radius:14px}
    .metric strong{font-size:32px;color:var(--blue);display:block;line-height:1.1}
    .metric span{font-size:13px;color:var(--muted)}
    .service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .service-card{background:#fff;padding:24px;border:1px solid var(--line);border-radius:14px;transition:.25s}
    .service-card:hover,.review:hover,.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#a9d0ef}
    .service-card p,.review p,.case-card p{margin:0;color:var(--muted);font-size:14px}
    .service-tag{display:inline-block;background:#e6f6ee;color:#26734e;padding:4px 8px;border-radius:5px;font-size:11px;font-weight:700;margin-bottom:14px}
    .process{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
    .step{padding:28px 20px 12px 0;border-right:1px solid var(--line);margin-right:20px;position:relative}
    .step:last-child{border-right:0}
    .step-number{font-size:38px;color:var(--cyan);font-weight:800;line-height:1}
    .step p{color:var(--muted);font-size:14px}
    .solution-list{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .solution-item{background:#fff;border:1px solid var(--line);padding:17px 18px;border-radius:10px}
    .solution-item strong{display:block;margin-bottom:4px}
    .solution-item span{font-size:13px;color:var(--muted)}
    .network{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
    .network span,.tag-cloud span{padding:9px 13px;border:1px solid #bcdbea;background:#fff;border-radius:8px;font-size:13px;color:#35546b}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}
    .tag-cloud span:nth-child(3n){background:#fff7d9;border-color:#f3d788}
    .tag-cloud span:nth-child(4n){background:#e9f8ee;border-color:#c1e7ca}
    .case-grid,.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .case-card,.review{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.25s}
    .case-image{background:#eaf5fa;aspect-ratio:16/8;overflow:hidden}
    .case-image img{width:100%;height:100%;object-fit:cover}
    .case-body{padding:20px}
    .case-body small{color:var(--blue);font-weight:700}
    .review{padding:22px}
    .review-top{display:flex;justify-content:space-between;gap:12px;margin-bottom:14px}
    .review-role{font-size:12px;color:var(--muted)}
    .stars{color:#e9a700;letter-spacing:2px;white-space:nowrap}
    .compare-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:14px}
    table{width:100%;min-width:720px;border-collapse:collapse}
    th,td{text-align:left;padding:16px 18px;border-bottom:1px solid var(--line);font-size:14px}
    th{background:#eaf6fb;color:#244761}
    td:first-child{font-weight:700;color:#2c4259}
    .highlight{color:var(--blue);font-weight:800}
    .rating{display:flex;align-items:center;justify-content:space-between;gap:20px;background:#142f50;color:#fff;border-radius:14px;padding:20px 24px;margin-bottom:20px}
    .rating strong{font-size:31px;color:var(--yellow)}
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .price-card{padding:23px;border:1px solid var(--line);background:#fff;border-radius:14px}
    .price-card strong{display:block;font-size:24px;margin:12px 0 4px;color:var(--blue)}
    .price-card span{font-size:13px;color:var(--muted)}
    .timeline{border-left:2px solid #add8e9;padding-left:25px}
    .timeline-item{position:relative;margin:0 0 25px}
    .timeline-item:before{content:"";width:11px;height:11px;border-radius:50%;background:var(--cyan);position:absolute;left:-32px;top:8px;box-shadow:0 0 0 5px #e2f7fa}
    .timeline-item h3{margin-bottom:4px}
    .timeline-item p{color:var(--muted);margin:0;font-size:14px}
    .article-list{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
    .article-list a{background:#fff;border:1px solid var(--line);padding:17px;border-radius:10px;font-weight:700;font-size:14px;transition:.2s}
    .article-list a:hover{border-color:var(--blue);color:var(--blue)}
    .faq-list{display:grid;grid-template-columns:1fr 1fr;gap:11px}
    details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 17px}
    summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";float:right;color:var(--blue);font-size:20px}
    details[open] summary:after{content:"−"}
    details p{color:var(--muted);font-size:14px;margin:0 0 16px}
    .form-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:var(--shadow)}
    form{display:grid;grid-template-columns:1fr 1fr;gap:15px}
    label{font-size:13px;font-weight:700;color:#344a60}
    input,select,textarea{width:100%;margin-top:6px;border:1px solid #cbdbe7;border-radius:8px;padding:12px 13px;font:inherit;color:var(--ink);background:#fbfdff;outline:none}
    input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(23,105,224,.1)}
    textarea{min-height:125px;resize:vertical}
    .field-full{grid-column:1/-1}
    .contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:30px;align-items:start}
    .contact-info{display:grid;gap:12px}
    .contact-item{background:#fff;border:1px solid var(--line);padding:16px;border-radius:10px}
    .contact-item strong{display:block;margin-bottom:3px}
    .contact-item span{color:var(--muted);font-size:14px}
    .qr{width:128px;margin-top:10px;border-radius:8px}
    .footer{background:#122b47;color:#e8f2fa;padding:48px 0 24px}
    .footer-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:30px}
    .footer h3{color:#fff;font-size:16px}
    .footer p,.footer a{color:#b9ccdc;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-links{display:flex;flex-wrap:wrap;gap:8px 18px}
    .copyright{border-top:1px solid rgba(255,255,255,.14);margin-top:30px;padding-top:18px;color:#9fb4c7;font-size:12px}
    .float-contact{position:fixed;right:20px;bottom:22px;z-index:15;background:var(--blue);color:#fff;border-radius:50%;width:54px;height:54px;display:grid;place-items:center;font-weight:800;box-shadow:0 8px 22px rgba(23,105,224,.3);transition:.2s}
    .float-contact:hover{transform:translateY(-4px)}
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s ease}
    .reveal.visible{opacity:1;transform:none}
    @media(max-width:980px){
      .nav-links{display:none;position:absolute;top:76px;left:18px;right:18px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow)}
      .nav-links.open{display:flex;flex-direction:column;align-items:stretch}
      .nav-links a{padding:11px 13px}
      .nav-cta{margin:5px 0 0!important;text-align:center}
      .menu-toggle{display:block}
      .hero-grid,.about-grid,.split-grid,.contact-grid{grid-template-columns:1fr}
      .metric-grid{grid-template-columns:repeat(2,1fr)}
      .service-grid{grid-template-columns:repeat(2,1fr)}
      .article-list{grid-template-columns:repeat(3,1fr)}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      section{padding:60px 0}
      .hero{padding:62px 0 54px}
      h1{font-size:42px}
      .hero-copy{font-size:17px}
      .section-head{display:block}
      .section-intro{margin-top:14px}
      .metric-grid,.service-grid,.case-grid,.review-grid,.price-grid,.faq-list,.solution-list{grid-template-columns:1fr}
      .process{display:block;border-top:0}
      .step{border-right:0;border-top:1px solid var(--line);margin:0;padding:22px 0}
      .article-list{grid-template-columns:1fr 1fr}
      form{grid-template-columns:1fr}
      .field-full{grid-column:auto}
      .footer-grid{grid-template-columns:1fr}
      .rating{align-items:flex-start;flex-direction:column}
    }