:root{
      --ink:#18342d;
      --muted:#607a71;
      --mint:#dff5e8;
      --mint-deep:#42a879;
      --leaf:#167a55;
      --cream:#fbfdf8;
      --line:#d9ebe0;
      --card:#ffffff;
      --shadow:0 18px 50px rgba(42,108,76,.10);
      --radius:22px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--cream);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:min(1160px,calc(100% - 36px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(251,253,248,.94);backdrop-filter:blur(14px);border-bottom:1px solid rgba(217,235,224,.8)}
    .nav-wrap{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
    .ai-page-logo{width:42px;max-width:100%;height:auto}
    .brand strong{font-size:18px;letter-spacing:.04em}
    .nav-links{display:flex;align-items:center;gap:0;list-style:none;margin:0;padding:0}
    .nav-links li{margin-left:24px}
    .nav-links a{font-size:14px;color:#46665b;transition:color .25s}
    .nav-links a:hover{color:var(--leaf)}
    .nav-cta,.btn{display:inline-flex;align-items:center;justify-content:center;border:0;cursor:pointer;border-radius:999px;padding:12px 21px;font-weight:700;transition:transform .25s,box-shadow .25s,background .25s}
    .nav-cta,.btn-primary{background:var(--leaf);color:#fff;box-shadow:0 10px 22px rgba(22,122,85,.2)}
    .nav-cta:hover,.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(22,122,85,.28)}
    .menu-toggle{display:none;background:transparent;border:1px solid var(--line);border-radius:10px;padding:8px 11px;color:var(--ink);font-size:20px}
    .hero{position:relative;overflow:hidden;padding:92px 0 76px;background:linear-gradient(135deg,#effbf2 0%,#e3f7ec 52%,#f9fdf8 100%)}
    .hero:before,.hero:after{content:"";position:absolute;border-radius:50%;pointer-events:none}
    .hero:before{width:420px;height:420px;background:rgba(117,210,157,.18);right:-140px;top:-190px}
    .hero:after{width:270px;height:270px;border:1px solid rgba(61,161,111,.22);left:-130px;bottom:-120px}
    .hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:50px;align-items:center}
    .eyebrow{display:inline-flex;padding:7px 13px;border:1px solid #b9e3c9;border-radius:999px;color:var(--leaf);font-size:13px;background:rgba(255,255,255,.58)}
    h1,h2,h3{line-height:1.25;margin:0;color:var(--ink)}
    h1{font-size:clamp(38px,6vw,68px);letter-spacing:-.05em;margin:20px 0 20px;max-width:650px}
    .hero-copy{font-size:18px;color:#4d6c61;max-width:650px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:13px;margin-top:30px}
    .btn-secondary{border:1px solid #acd8bb;background:#fff;color:var(--leaf)}
    .btn-secondary:hover{transform:translateY(-2px);background:#f5fff8}
    .hero-panel{padding:25px;border:1px solid rgba(159,211,177,.7);border-radius:28px;background:rgba(255,255,255,.63);box-shadow:var(--shadow)}
    .hero-panel h3{font-size:20px;margin-bottom:18px}
    .signal-list{display:grid;gap:12px}
    .signal{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-radius:15px;background:#fff;border:1px solid #e3f0e6}
    .signal span{color:var(--muted);font-size:14px}
    .signal strong{color:var(--leaf);font-size:18px}
    .section{padding:88px 0}
    .section-soft{background:#f0faf3}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:32px}
    .section-head h2{font-size:clamp(28px,4vw,42px);letter-spacing:-.035em}
    .section-head p{max-width:520px;color:var(--muted);margin:0}
    .label{font-size:13px;font-weight:700;color:var(--leaf);letter-spacing:.12em;text-transform:uppercase;margin-bottom:10px}
    .about-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
    .about-card,.service-card,.quote-card,.network-card,.case-card,.article-card,.contact-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 30px rgba(54,111,80,.06)}
    .about-card{padding:29px}
    .about-card p{color:var(--muted);margin:10px 0 0}
    .metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:18px}
    .metric{padding:20px;border-radius:18px;background:#effaf2;border:1px solid #d5efdc}
    .metric strong{display:block;font-size:28px;color:var(--leaf)}
    .metric span{color:var(--muted);font-size:13px}
    .service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .service-card{padding:24px;transition:transform .28s,box-shadow .28s}
    .service-card:hover,.case-card:hover,.quote-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
    .service-icon{width:42px;height:42px;display:grid;place-items:center;border-radius:13px;background:var(--mint);color:var(--leaf);font-weight:800;margin-bottom:18px}
    .service-card h3{font-size:20px;margin-bottom:8px}
    .service-card p,.service-card li{color:var(--muted);font-size:14px}
    .service-card ul{padding-left:18px;margin:10px 0 0}
    .workflow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative}
    .workflow:before{content:"";position:absolute;top:28px;left:9%;right:9%;height:1px;background:#b9dec5}
    .step{position:relative;text-align:center;padding:0 14px}
    .step-num{width:56px;height:56px;display:grid;place-items:center;margin:0 auto 16px;border-radius:50%;background:var(--leaf);color:#fff;font-size:18px;font-weight:800;border:8px solid #e2f5e8}
    .step h3{font-size:17px;margin-bottom:7px}
    .step p{margin:0;color:var(--muted);font-size:14px}
    .scenario-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px}
    .timeline{padding:28px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
    .timeline-item{display:grid;grid-template-columns:92px 1fr;gap:20px;padding:18px 0;border-bottom:1px dashed #cfe5d5}
    .timeline-item:last-child{border-bottom:0}
    .timeline-item b{color:var(--leaf)}
    .timeline-item h3{font-size:18px;margin-bottom:5px}
    .timeline-item p{margin:0;color:var(--muted);font-size:14px}
    .tag-panel{padding:28px;background:#dff5e8;border-radius:var(--radius)}
    .tag-panel h3{margin-bottom:18px}
    .tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#fff;color:#3d6e58;font-size:13px}
    .network-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .network-card{padding:24px}
    .network-card h3{font-size:19px;margin-bottom:8px}
    .network-card p{margin:0;color:var(--muted);font-size:14px}
    .case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .case-card{overflow:hidden}
    .case-card .media{aspect-ratio:16/9;background:#e4f5ea;overflow:hidden}
    .case-card .media img{width:100%;height:100%;object-fit:cover}
    .case-body{padding:20px}
    .case-body h3{font-size:19px;margin-bottom:6px}
    .case-body p{margin:0;color:var(--muted);font-size:14px}
    .table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
    table{width:100%;min-width:760px;border-collapse:collapse}
    th,td{text-align:left;padding:17px 18px;border-bottom:1px solid #e7f1e9;font-size:14px}
    th{background:#e8f7ed;color:#2e6b50}
    tr:last-child td{border-bottom:0}
    td:first-child{font-weight:700;color:var(--ink)}
    .rating{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px;padding:22px 26px;border-radius:20px;background:#e1f6e8}
    .stars{color:#e28b35;font-size:25px;letter-spacing:3px}
    .rating strong{font-size:30px;color:var(--leaf)}
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .price-card{padding:25px;border:1px solid #cce8d5;border-radius:20px;background:#fff}
    .price-card h3{font-size:19px;margin-bottom:8px}
    .price-card p{margin:0;color:var(--muted);font-size:14px}
    .price-card b{display:block;margin-top:17px;color:var(--leaf);font-size:15px}
    .quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .quote-card{padding:24px}
    .quote-card p{margin:0 0 18px;color:#45665a;font-size:15px}
    .quote-card footer{color:var(--leaf);font-size:13px;font-weight:700}
    .article-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
    .article-card{padding:18px;min-height:150px;display:flex;flex-direction:column;justify-content:space-between}
    .article-card span{font-size:12px;color:var(--leaf)}
    .article-card h3{font-size:16px;margin:12px 0}
    .article-card a{color:var(--leaf);font-size:13px;font-weight:700}
    .faq-list{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    details{background:#fff;border:1px solid var(--line);border-radius:15px;padding:17px 19px}
    summary{cursor:pointer;font-weight:700;color:var(--ink);list-style:none}
    summary::-webkit-details-marker{display:none}
    details p{margin:11px 0 0;color:var(--muted);font-size:14px}
    .contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:22px}
    .contact-card{padding:28px}
    .contact-card h3{margin-bottom:10px}
    .contact-card p{color:var(--muted);font-size:14px}
    .contact-list{display:grid;gap:10px;margin-top:20px}
    .contact-list div{padding:11px 14px;border-radius:12px;background:#eef9f1;color:#426b59;font-size:14px}
    form{display:grid;grid-template-columns:1fr 1fr;gap:15px}
    .field{display:grid;gap:7px}
    .field.full{grid-column:1/-1}
    label{font-size:13px;font-weight:700;color:#46665a}
    input,select,textarea{width:100%;border:1px solid #cfe6d6;border-radius:11px;padding:12px 13px;background:#fbfefb;color:var(--ink);font:inherit;outline:none}
    input:focus,select:focus,textarea:focus{border-color:var(--mint-deep);box-shadow:0 0 0 3px rgba(66,168,121,.12)}
    textarea{min-height:120px;resize:vertical}
    form .btn{justify-self:start}
    .footer{background:#183f32;color:#dceee3;padding:42px 0 25px}
    .footer-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:30px}
    .footer h3{color:#fff;font-size:16px;margin-bottom:13px}
    .footer p,.footer a{color:#b8d5c4;font-size:13px}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px 18px}
    .footer-bottom{border-top:1px solid rgba(220,238,227,.16);margin-top:28px;padding-top:18px;font-size:12px;color:#a9c8b5}
    .float-tools{position:fixed;right:18px;bottom:22px;z-index:15;display:flex;flex-direction:column;align-items:flex-end;gap:9px}
    .float-main{border:0;border-radius:999px;padding:12px 17px;background:var(--leaf);color:#fff;box-shadow:0 12px 25px rgba(22,122,85,.25);cursor:pointer;font-weight:700}
    .qr-box{display:none;padding:10px;border-radius:16px;background:#fff;box-shadow:var(--shadow);width:145px}
    .qr-box img{width:125px}
    .float-tools:hover .qr-box{display:block}
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
    .reveal.show{opacity:1;transform:none}
    @media(max-width:980px){
      .nav-links{display:none;position:absolute;top:74px;left:18px;right:18px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
      .nav-links.open{display:flex}
      .nav-links li{margin:0}
      .nav-links a{display:block;padding:10px 12px}
      .menu-toggle{display:block}
      .nav-cta{display:none}
      .hero-grid,.scenario-grid,.contact-grid{grid-template-columns:1fr}
      .service-grid,.case-grid,.network-grid,.quote-grid{grid-template-columns:repeat(2,1fr)}
      .article-grid{grid-template-columns:repeat(3,1fr)}
    }
    @media(max-width:650px){
      .container{width:min(100% - 28px,1160px)}
      .hero{padding:65px 0 55px}
      .section{padding:62px 0}
      .section-head{display:block}
      .section-head p{margin-top:12px}
      .metrics,.service-grid,.case-grid,.network-grid,.quote-grid,.price-grid,.faq-list,.footer-grid{grid-template-columns:1fr}
      .workflow{grid-template-columns:1fr 1fr;gap:28px 8px}
      .workflow:before{display:none}
      .article-grid{grid-template-columns:1fr 1fr}
      .rating{display:block}
      .rating strong{display:block;margin-top:8px}
      form{grid-template-columns:1fr}
      .field.full{grid-column:auto}
      h1{font-size:42px}
      .hero-copy{font-size:16px}
    }