:root{
      --ink:#15313d;--muted:#5f7480;--brand:#087ea4;--brand-dark:#07566f;
      --cyan:#dff7fb;--orange:#ff845c;--yellow:#ffd86b;--paper:#fff;
      --line:#d8e8ec;--soft:#f3fafb;--shadow:0 16px 36px rgba(17,73,91,.10)
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:#f5fbfc;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}
    button,input,select,textarea{font:inherit}
    .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(10px)}
    .nav-wrap{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
    .brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
    .ai-page-logo{width:42px;height:42px;object-fit:contain}
    .brand strong{font-size:19px;letter-spacing:0}
    .brand small{display:block;color:var(--muted);font-size:11px;line-height:1.2}
    .nav-links{display:flex;align-items:center;justify-content:flex-end;gap:0;flex-wrap:wrap}
    .nav-links a{font-size:13px;color:#39535e;padding:8px 9px;border-radius:6px}
    .nav-links a:hover{color:var(--brand);background:var(--cyan)}
    .nav-cta,.primary-btn{background:var(--brand);color:#fff;border:0;border-radius:7px;padding:12px 19px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;gap:7px;cursor:pointer;transition:.2s ease}
    .nav-cta:hover,.primary-btn:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:0 8px 18px rgba(8,126,164,.22)}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--brand);border-radius:6px;padding:8px 11px;cursor:pointer}
    .hero{position:relative;overflow:hidden;background:#eaf9fb;padding:86px 0 72px;border-bottom:1px solid #cae9ee}
    .hero:before,.hero:after{content:"";position:absolute;z-index:0;border-radius:50%}
    .hero:before{width:360px;height:360px;background:#c8f0ef;right:-100px;top:-150px}
    .hero:after{width:190px;height:190px;background:#ffe19b;left:-70px;bottom:-100px}
    .hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:60px;align-items:center}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--brand-dark);font-size:13px;font-weight:700;letter-spacing:1px;margin-bottom:18px}
    .eyebrow:before{content:"";width:28px;height:3px;background:var(--orange);border-radius:3px}
    h1,h2,h3,p{margin-top:0}
    h1{font-size:clamp(36px,5vw,64px);line-height:1.12;letter-spacing:0;margin-bottom:22px;max-width:720px}
    .hero-copy{font-size:18px;color:#47636e;max-width:680px;margin-bottom:30px}
    .actions{display:flex;flex-wrap:wrap;gap:12px}
    .secondary-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:11px 18px;border:1px solid #9ccbd3;border-radius:7px;color:var(--brand-dark);font-weight:700;background:#fff}
    .secondary-btn:hover{border-color:var(--brand);background:#f4ffff}
    .hero-panel{border-left:4px solid var(--orange);padding:24px 0 24px 28px}
    .hero-panel h2{font-size:21px;margin-bottom:14px}
    .hero-panel p{color:var(--muted);margin-bottom:20px}
    .hero-tags{display:flex;flex-wrap:wrap;gap:8px}
    .tag{font-size:12px;color:var(--brand-dark);background:#fff;border:1px solid #b9e3e7;padding:5px 9px;border-radius:20px}
    section{padding:78px 0}
    .section-head{display:flex;justify-content:space-between;gap:25px;align-items:end;margin-bottom:30px}
    .section-head h2{font-size:clamp(27px,3vw,42px);line-height:1.2;margin-bottom:8px}
    .section-head p{color:var(--muted);max-width:650px;margin-bottom:0}
    .section-label{color:var(--orange);font-size:12px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase}
    .metrics{margin-top:-1px;background:#fff;border-bottom:1px solid var(--line);padding:22px 0}
    .metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
    .metric{background:#fff;padding:18px 22px}
    .metric strong{font-size:28px;color:var(--brand-dark);display:block;line-height:1.2}
    .metric span{color:var(--muted);font-size:13px}
    .about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
    .lead{font-size:21px;line-height:1.6;color:var(--brand-dark)}
    .check-list{display:grid;grid-template-columns:1fr 1fr;gap:12px 18px;padding:0;margin:26px 0 0;list-style:none}
    .check-list li{padding-left:26px;position:relative;color:#49636c}
    .check-list li:before{content:"✓";position:absolute;left:0;color:var(--orange);font-weight:bold}
    .about-note{background:#fff;border-top:4px solid var(--yellow);padding:26px;box-shadow:var(--shadow)}
    .about-note h3{margin-bottom:10px}
    .about-note p{color:var(--muted);margin-bottom:0}
    .service-section{background:#fff}
    .service-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service-card{border:1px solid var(--line);padding:22px;background:#fff;transition:.25s ease}
    .service-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#9ed8df}
    .service-card b{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;background:var(--cyan);color:var(--brand-dark);border-radius:50%;margin-bottom:16px}
    .service-card h3{font-size:18px;margin-bottom:8px}
    .service-card p{font-size:13px;color:var(--muted);margin-bottom:0}
    .workflow{background:#e9f8f8}
    .steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:2px solid #9ed8df}
    .step{padding:25px 18px 8px;position:relative}
    .step:before{content:"";position:absolute;top:-11px;left:18px;width:19px;height:19px;background:var(--orange);border:5px solid #e9f8f8;border-radius:50%}
    .step strong{display:block;color:var(--brand-dark);font-size:18px;margin-bottom:8px}
    .step p{font-size:13px;color:var(--muted);margin:0}
    .solution-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .solution{background:#fff;padding:24px;border:1px solid var(--line);border-bottom:4px solid var(--brand)}
    .solution h3{font-size:19px;margin-bottom:9px}
    .solution p{font-size:14px;color:var(--muted);margin-bottom:0}
    .network{background:#fff}
    .network-box{display:grid;grid-template-columns:1fr 1.3fr;gap:32px;align-items:center}
    .network-copy{padding-right:20px}
    .network-copy p{color:var(--muted)}
    .model-cloud{display:flex;flex-wrap:wrap;gap:10px;padding:22px;background:#f6fbfc;border:1px solid var(--line)}
    .model-cloud span{background:#fff;border:1px solid #c7e1e5;padding:7px 12px;border-radius:4px;font-size:13px;color:#3b626d}
    .case-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:18px}
    .case{background:#fff;border:1px solid var(--line);overflow:hidden}
    .image-frame{aspect-ratio:16/9;overflow:hidden;background:#dff4f5}
    .image-frame img{width:100%;height:100%;object-fit:cover}
    .case-body{padding:20px}
    .case-body h3{margin-bottom:8px}
    .case-body p{font-size:13px;color:var(--muted);margin-bottom:0}
    .compare-wrap{display:grid;grid-template-columns:.7fr 1.3fr;gap:25px;align-items:start}
    .rating{background:var(--brand-dark);color:#fff;padding:28px}
    .rating h3{font-size:20px;margin-bottom:15px}
    .stars{color:var(--yellow);font-size:25px;letter-spacing:2px}
    .rating strong{font-size:48px;display:block;line-height:1.2}
    .rating small{color:#c8e8eb}
    .table-scroll{overflow-x:auto;background:#fff;border:1px solid var(--line)}
    table{width:100%;border-collapse:collapse;min-width:640px}
    th,td{text-align:left;padding:15px;border-bottom:1px solid var(--line);font-size:14px}
    th{background:#eff9fa;color:var(--brand-dark)}
    td:first-child{font-weight:700;color:#385864}
    .positive{color:#07805c;font-weight:700}
    .price-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}
    .price-card{border:1px solid var(--line);background:#fff;padding:22px}
    .price-card h3{font-size:17px;margin-bottom:7px}
    .price-card p{color:var(--muted);font-size:13px;margin:0}
    .reviews{background:#fff}
    .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review{border:1px solid var(--line);padding:23px;background:#fbfefe}
    .review p{font-size:14px;color:#49636c;margin-bottom:18px}
    .review footer{font-size:13px;color:var(--brand-dark);font-weight:700}
    .review footer:before{content:"";display:inline-block;width:22px;height:2px;background:var(--orange);vertical-align:middle;margin-right:8px}
    .articles{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
    .article{background:#fff;border:1px solid var(--line);padding:17px;min-height:135px;display:flex;flex-direction:column;justify-content:space-between}
    .article span{font-size:11px;color:var(--orange);font-weight:700}
    .article h3{font-size:15px;line-height:1.5;margin:12px 0}
    .article a{font-size:12px;color:var(--brand);font-weight:700}
    .faq-section{background:#eaf8fa}
    .faq-list{display:grid;grid-template-columns:1fr 1fr;gap:12px 20px}
    details{background:#fff;border:1px solid var(--line);padding:0 19px}
    summary{cursor:pointer;list-style:none;padding:17px 24px 17px 0;font-weight:700;position:relative}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";position:absolute;right:0;color:var(--orange);font-size:22px}
    details[open] summary:after{content:"−"}
    details p{border-top:1px solid var(--line);padding:14px 0 4px;color:var(--muted);font-size:14px;margin:0 0 12px}
    .form-area{display:grid;grid-template-columns:.75fr 1.25fr;gap:34px;align-items:start}
    .contact-copy{background:var(--brand-dark);color:#fff;padding:30px}
    .contact-copy h2{font-size:30px}
    .contact-copy p{color:#d5eff1}
    .contact-list{list-style:none;margin:24px 0 0;padding:0}
    .contact-list li{padding:9px 0;border-bottom:1px solid rgba(255,255,255,.18);font-size:14px}
    .form-card{background:#fff;border:1px solid var(--line);padding:27px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    label{font-size:13px;color:#46616b;font-weight:700;display:block}
    input,select,textarea{width:100%;margin-top:6px;border:1px solid #c9dfe3;border-radius:5px;padding:12px;background:#fbfefe;color:var(--ink);outline:none}
    input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px #dff5f7}
    textarea{resize:vertical;min-height:120px}
    .full{grid-column:1/-1}
    .form-note{font-size:12px;color:var(--muted);margin:14px 0 0}
    .footer{background:#143944;color:#d7edf0;padding:42px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:28px}
    .footer h3{font-size:16px;color:#fff;margin-bottom:13px}
    .footer p,.footer a{font-size:13px;color:#b9d6da}
    .footer a:hover{color:#fff}
    .footer-links{display:grid;gap:6px}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.18);margin-top:30px;padding-top:17px;font-size:12px;color:#a8c6ca;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
    .qr{width:100px;background:#fff;padding:6px}
    .float-contact{position:fixed;right:18px;bottom:22px;z-index:15;background:var(--orange);color:#fff;border-radius:50px;padding:12px 17px;box-shadow:0 10px 24px rgba(186,83,54,.28);font-size:13px;font-weight:700}
    .back-top{position:fixed;right:18px;bottom:78px;border:1px solid var(--line);background:#fff;color:var(--brand);width:38px;height:38px;border-radius:50%;cursor:pointer;display:none}
    .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{display:none;position:absolute;left:20px;right:20px;top:76px;background:#fff;border:1px solid var(--line);padding:10px;box-shadow:var(--shadow)}
      .nav-links.open{display:grid;grid-template-columns:repeat(3,1fr)}
      .nav-links a{text-align:center}
      .menu-toggle{display:block}
      .service-grid{grid-template-columns:repeat(2,1fr)}
      .articles{grid-template-columns:repeat(3,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:760px){
      .container{width:min(100% - 28px,1180px)}
      .nav-wrap{min-height:68px}
      .nav-links{top:68px;left:14px;right:14px}
      .nav-links.open{grid-template-columns:repeat(2,1fr)}
      .hero{padding:62px 0 54px}
      .hero-grid,.about-grid,.network-box,.compare-wrap,.form-area{grid-template-columns:1fr;gap:28px}
      h1{font-size:40px}
      .hero-copy{font-size:16px}
      section{padding:58px 0}
      .metric-grid{grid-template-columns:repeat(2,1fr)}
      .metric{padding:16px}
      .check-list{grid-template-columns:1fr}
      .steps{grid-template-columns:1fr;border-top:0;border-left:2px solid #9ed8df;margin-left:9px}
      .step{padding:18px 12px 18px 25px}
      .step:before{left:-11px;top:20px}
      .solution-grid,.review-grid{grid-template-columns:1fr}
      .case-grid{grid-template-columns:1fr}
      .price-strip{grid-template-columns:1fr}
      .faq-list{grid-template-columns:1fr}
      .articles{grid-template-columns:1fr 1fr}
      .form-grid{grid-template-columns:1fr}
      .full{grid-column:auto}
      .footer-grid{grid-template-columns:1fr}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:6px}
    }
    @media(prefers-reduced-motion:reduce){
      html{scroll-behavior:auto}
      *,*:before,*:after{animation:none!important;transition:none!important}
      .reveal{opacity:1;transform:none}
    }