:root {
      --blue-950:#061b4b;
      --blue-900:#092b72;
      --blue-800:#0d46a0;
      --blue-700:#145fc7;
      --blue-500:#2383ed;
      --cyan:#1bb7d8;
      --ink:#10213f;
      --muted:#5d6e89;
      --line:#d9e4f2;
      --surface:#ffffff;
      --soft:#f3f7fc;
      --accent:#f5b83d;
      --radius:10px;
      --shadow:0 18px 50px rgba(16,53,112,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:#f5f8fc;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,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% - 40px));margin:0 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(14px)}
    .nav-wrap{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .brand{display:flex;align-items:center;gap:12px;flex:none}
    .ai-page-logo{width:45px;height:45px;object-fit:contain}
    .brand-name{font-size:18px;font-weight:800;color:var(--blue-900);white-space:nowrap}
    .nav-links{display:flex;align-items:center;justify-content:flex-end;gap:0;flex-wrap:wrap}
    .nav-links a{font-size:13px;color:#405474;padding:8px 9px;transition:.2s}
    .nav-links a:hover{color:var(--blue-700)}
    .nav-cta,.primary-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--blue-800);color:#fff;padding:12px 20px;border-radius:6px;font-weight:700;border:1px solid var(--blue-800);transition:.25s}
    .nav-cta{font-size:13px;padding:9px 15px;margin-left:12px}
    .nav-cta:hover,.primary-btn:hover{background:var(--blue-950);transform:translateY(-2px);box-shadow:0 10px 24px rgba(13,70,160,.25)}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--blue-900);border-radius:6px;padding:8px 11px;font-size:20px}
    .hero{position:relative;overflow:hidden;background:var(--blue-950);color:#fff;padding:92px 0 78px}
    .hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(83,148,230,.11) 1px,transparent 1px),linear-gradient(90deg,rgba(83,148,230,.11) 1px,transparent 1px);background-size:48px 48px;opacity:.55}
    .hero:after{content:"";position:absolute;width:360px;height:360px;border:1px solid rgba(46,157,233,.35);right:-100px;top:-120px;transform:rotate(28deg)}
    .hero-content{position:relative;z-index:1;max-width:790px}
    .eyebrow{display:inline-flex;align-items:center;gap:9px;color:#91dff3;font-size:14px;font-weight:700;letter-spacing:1px;margin-bottom:18px}
    .eyebrow:before{content:"";width:28px;height:2px;background:var(--cyan)}
    h1,h2,h3,p{margin-top:0}
    h1{font-size:clamp(36px,6vw,68px);line-height:1.15;letter-spacing:0;margin-bottom:22px;max-width:720px}
    .hero-copy{font-size:18px;color:#d7e6ff;max-width:680px;margin-bottom:30px}
    .hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:13px}
    .hero .primary-btn{background:var(--accent);border-color:var(--accent);color:#162746}
    .hero .primary-btn:hover{background:#ffd26a;border-color:#ffd26a}
    .secondary-btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid rgba(255,255,255,.5);color:#fff;border-radius:6px;padding:12px 20px;font-weight:700;transition:.25s}
    .secondary-btn:hover{background:#fff;color:var(--blue-900)}
    .hero-note{font-size:13px;color:#a9bee0;margin-top:20px}
    .section{padding:88px 0}
    .section.alt{background:#edf4fb}
    .section.dark{background:var(--blue-900);color:#fff}
    .section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px}
    .section-heading h2{font-size:clamp(27px,4vw,42px);line-height:1.25;margin:0;color:var(--blue-950)}
    .dark .section-heading h2{color:#fff}
    .section-heading p{max-width:550px;color:var(--muted);margin:0}
    .dark .section-heading p{color:#c8daf5}
    .kicker{color:var(--blue-700);font-weight:800;font-size:13px;letter-spacing:1px;margin-bottom:8px}
    .dark .kicker{color:#82dced}
    .intro-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:start}
    .intro-copy{font-size:17px;color:#405474}
    .intro-copy strong{color:var(--blue-900)}
    .principles{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .principle{background:#fff;border-left:4px solid var(--cyan);padding:17px 18px;box-shadow:var(--shadow)}
    .principle b{display:block;color:var(--blue-900);margin-bottom:3px}
    .metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:38px}
    .metric{background:#fff;border:1px solid var(--line);padding:22px 20px;border-top:3px solid var(--blue-700)}
    .metric strong{display:block;font-size:29px;color:var(--blue-800);line-height:1.1;margin-bottom:7px}
    .metric span{font-size:14px;color:var(--muted)}
    .service-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service-card{background:#fff;border:1px solid var(--line);padding:24px 20px;transition:.25s}
    .service-card:hover,.quote-card:hover,.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#9fc3ef}
    .service-icon{width:42px;height:42px;background:#e5f4fb;color:var(--blue-800);display:grid;place-items:center;font-weight:800;border-radius:8px;margin-bottom:15px}
    .service-card h3{font-size:18px;margin-bottom:9px;color:var(--blue-950)}
    .service-card p{font-size:14px;color:var(--muted);margin:0}
    .workflow{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:2px solid #9bc6ee}
    .step{position:relative;padding:26px 18px 8px;border-right:1px solid var(--line)}
    .step:last-child{border-right:0}
    .step-number{position:absolute;top:-19px;left:18px;width:36px;height:36px;border-radius:50%;background:var(--blue-800);color:#fff;display:grid;place-items:center;font-weight:800;border:4px solid #edf4fb}
    .step h3{font-size:17px;margin:17px 0 8px}
    .step p{font-size:14px;color:var(--muted);margin:0}
    .solution-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .solution{border:1px solid #c4dbf3;background:#fff;padding:22px}
    .solution h3{font-size:18px;color:var(--blue-900);margin-bottom:8px}
    .solution p{font-size:14px;color:var(--muted);margin-bottom:12px}
    .tag-list,.model-cloud{display:flex;flex-wrap:wrap;gap:8px}
    .tag{font-size:12px;color:var(--blue-800);background:#eaf4ff;border:1px solid #c8e0f8;padding:4px 9px;border-radius:20px}
    .network{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:stretch}
    .network-panel{background:#fff;padding:27px;border:1px solid var(--line)}
    .network-panel h3{font-size:20px;color:var(--blue-900);margin-bottom:12px}
    .model-cloud .tag{background:#f4f7fb;color:#354f79;border-color:#dce7f3}
    .comparison-wrap{overflow-x:auto;border:1px solid #315c9e;background:#fff}
    .comparison{width:100%;min-width:760px;border-collapse:collapse;color:var(--ink)}
    .comparison th,.comparison td{padding:16px 18px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}
    .comparison th{background:#eaf3ff;color:var(--blue-950);font-size:15px}
    .comparison td:first-child{font-weight:700;color:var(--blue-900)}
    .rating{display:flex;align-items:center;gap:18px;background:#fff;padding:22px 26px;margin-bottom:18px;color:var(--ink)}
    .stars{color:#f2ac22;font-size:25px;letter-spacing:2px}
    .rating strong{font-size:30px;color:var(--blue-800)}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
    .timeline-item{position:relative;background:#fff;border-top:4px solid var(--cyan);padding:22px 18px}
    .timeline-item span{font-size:12px;color:var(--blue-700);font-weight:800}
    .timeline-item h3{font-size:18px;margin:8px 0}
    .timeline-item p{font-size:14px;color:var(--muted);margin:0}
    .cases{display:grid;grid-template-columns:1.15fr .85fr;gap:20px}
    .case-card{background:#fff;border:1px solid var(--line);transition:.25s;overflow:hidden}
    .case-card .media{background:#dceafa;display:flex;align-items:center;justify-content:center;min-height:180px;padding:18px}
    .case-card .media img{width:100%;max-height:240px;object-fit:contain}
    .case-body{padding:21px}
    .case-body h3{color:var(--blue-900);margin-bottom:8px}
    .case-body p{font-size:14px;color:var(--muted);margin:0}
    .case-stack{display:grid;gap:20px}
    .case-stack .media{min-height:130px}
    .case-stack .media img{max-height:170px}
    .quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .quote-card{background:#fff;border:1px solid var(--line);padding:22px;transition:.25s}
    .quote-card p{font-size:15px;color:#3e5270;margin-bottom:18px}
    .quote-card footer{font-size:13px;color:var(--blue-700);font-weight:700}
    .article-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
    .article{background:#fff;border:1px solid var(--line);padding:18px;min-height:140px}
    .article small{color:var(--blue-700);font-weight:700}
    .article h3{font-size:16px;line-height:1.45;margin:9px 0;color:var(--blue-900)}
    .article span{font-size:13px;color:var(--muted)}
    .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 20px}
    .faq-item{background:#fff;border:1px solid var(--line)}
    .faq-item summary{cursor:pointer;list-style:none;padding:17px 20px;font-weight:700;color:var(--blue-900);display:flex;justify-content:space-between;gap:15px}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary:after{content:"+";font-size:20px;line-height:1;color:var(--blue-700)}
    .faq-item[open] summary:after{content:"−"}
    .faq-answer{padding:0 20px 17px;color:var(--muted);font-size:14px}
    .match-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:28px;align-items:start}
    .match-copy{background:var(--blue-900);color:#fff;padding:30px}
    .match-copy h2{font-size:31px;line-height:1.3;margin-bottom:15px}
    .match-copy p{color:#d7e5f8}
    .contact-list{list-style:none;padding:0;margin:24px 0 0;display:grid;gap:10px;color:#d7e5f8;font-size:14px}
    .contact-list strong{color:#fff}
    .form-panel{background:#fff;border:1px solid var(--line);padding:28px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .field{display:grid;gap:7px}
    .field.full{grid-column:1/-1}
    label{font-size:13px;font-weight:700;color:var(--blue-900)}
    input,select,textarea{width:100%;font:inherit;font-size:14px;border:1px solid #c8d8ea;border-radius:5px;padding:12px 13px;color:var(--ink);background:#fbfdff}
    textarea{min-height:125px;resize:vertical}
    .form-note{font-size:12px;color:var(--muted);margin:12px 0 0}
    .footer{background:#071b43;color:#d6e4f8;padding:48px 0 24px}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr 1fr;gap:35px}
    .footer h3{color:#fff;font-size:17px;margin-bottom:13px}
    .footer p{font-size:14px;margin-bottom:7px}
    .footer-links{display:flex;flex-wrap:wrap;gap:9px 15px;font-size:13px}
    .footer-links a:hover{color:#86def0}
    .qr{width:108px;background:#fff;padding:5px;margin-top:10px}
    .copyright{border-top:1px solid rgba(255,255,255,.16);margin-top:32px;padding-top:18px;font-size:12px;color:#aabbd5}
    .floating{position:fixed;right:18px;bottom:20px;z-index:15}
    .floating a{display:flex;align-items:center;gap:8px;background:var(--accent);color:#172746;padding:11px 15px;border-radius:28px;box-shadow:0 9px 26px rgba(5,27,75,.25);font-size:13px;font-weight:800}
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s ease}
    .reveal.visible{opacity:1;transform:none}
    @media(max-width:1080px){
      .nav-links a{padding:7px 5px;font-size:12px}
      .service-grid{grid-template-columns:repeat(2,1fr)}
      .article-grid{grid-template-columns:repeat(3,1fr)}
    }
    @media(max-width:780px){
      .container{width:min(100% - 28px,620px)}
      .site-header{position:relative}
      .nav-wrap{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:8px;box-shadow:var(--shadow);align-items:stretch}
      .nav-links.open{display:flex}
      .nav-links a{padding:10px 12px;width:100%;border-bottom:1px solid #edf2f8}
      .nav-cta{margin:8px 0 0}
      .hero{padding:65px 0 60px}
      .hero-copy{font-size:16px}
      .section{padding:62px 0}
      .section-heading{display:block}
      .section-heading p{margin-top:12px}
      .intro-grid,.network,.cases,.match-grid{grid-template-columns:1fr}
      .metrics{grid-template-columns:repeat(2,1fr)}
      .workflow{grid-template-columns:1fr;border-top:0;gap:14px}
      .step{border-right:0;border-left:2px solid #9bc6ee;padding:8px 14px 8px 26px}
      .step-number{left:-19px;top:8px}
      .solution-grid,.quotes{grid-template-columns:1fr 1fr}
      .timeline{grid-template-columns:1fr 1fr}
      .faq-grid{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr;gap:25px}
    }
    @media(max-width:500px){
      h1{font-size:38px}
      .principles,.solution-grid,.quotes,.article-grid,.form-grid{grid-template-columns:1fr}
      .metrics{gap:9px}
      .metric{padding:16px 13px}
      .metric strong{font-size:23px}
      .timeline{grid-template-columns:1fr}
      .hero-actions a{width:100%}
      .floating a{padding:10px 12px}
    }
    @media(prefers-reduced-motion:reduce){
      *,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
      .reveal{opacity:1;transform:none}
    }