:root{
      --bg:#f5fbfc;
      --panel:#ffffff;
      --panel-2:#eef8f8;
      --line:#d7e7ea;
      --text:#13313a;
      --muted:#5e7680;
      --brand:#0ea5a6;
      --brand-2:#2b74ff;
      --accent:#18c29c;
      --shadow:0 18px 40px rgba(16, 56, 63, .08);
      --radius:22px;
      --radius-sm:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;background:linear-gradient(180deg,#f8fcfc 0%,#f3f9fb 45%,#f7fbfc 100%);color:var(--text)}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .topbar{position:sticky;top:0;z-index:50;background:rgba(245,251,252,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(215,231,234,.75)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;box-shadow:0 10px 20px rgba(16,56,63,.08);padding:6px}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:18px;letter-spacing:.5px}
    .brand-text span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
    .nav-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:14px;align-items:center}
    .nav-links a{font-size:14px;color:#35525b;padding:8px 10px;border-radius:999px;transition:.25s ease}
    .nav-links a:hover,.nav-links a:focus-visible{background:#e5f6f6;color:#0d6c6c}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:999px;padding:12px 18px;font-weight:700;transition:.25s ease;cursor:pointer;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-2) 100%);color:#fff;box-shadow:0 16px 28px rgba(14,165,166,.2)}
    .btn-secondary{background:#fff;color:#16424a;border-color:var(--line)}
    .btn:hover{transform:translateY(-1px);box-shadow:0 14px 24px rgba(19,49,58,.12)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;width:44px;height:44px;align-items:center;justify-content:center}
    .hero{padding:34px 0 16px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:stretch}
    .hero-card{background:linear-gradient(135deg,#0b7e85 0%,#0f93b2 44%,#2563eb 100%);color:#fff;border-radius:28px;padding:34px;position:relative;overflow:hidden;box-shadow:var(--shadow);min-height:420px}
    .hero-card:before,.hero-card:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.1);filter:blur(8px)}
    .hero-card:before{width:220px;height:220px;right:-70px;top:-60px}
    .hero-card:after{width:160px;height:160px;left:-50px;bottom:-40px}
    .hero-kicker{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16);padding:8px 12px;border-radius:999px;font-size:13px}
    h1{margin:16px 0 12px;font-size:clamp(30px,5vw,56px);line-height:1.05;letter-spacing:-.02em;max-width:12em}
    .hero p{margin:0;color:rgba(255,255,255,.9);font-size:16px;line-height:1.8;max-width:44rem}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-actions .btn-primary{background:#fff;color:#0a7482}
    .hero-actions .btn-secondary{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.18)}
    .hero-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:24px}
    .stat{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.12);border-radius:18px;padding:16px}
    .stat strong{display:block;font-size:24px}
    .stat span{display:block;margin-top:6px;font-size:13px;color:rgba(255,255,255,.82);line-height:1.5}
    .hero-side{display:grid;gap:18px}
    .side-panel{background:var(--panel);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:22px}
    .side-panel h2,.section-title h2{margin:0;font-size:28px;line-height:1.2}
    .section{padding:26px 0}
    .section-title{display:flex;justify-content:space-between;align-items:end;gap:14px;margin-bottom:16px}
    .section-title p{margin:0;color:var(--muted);line-height:1.7;max-width:56rem}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;transition:.25s ease}
    .card:hover{transform:translateY(-3px);box-shadow:0 20px 42px rgba(19,49,58,.11)}
    .metric strong{display:block;font-size:30px;color:#0b6f7b}
    .metric span{display:block;margin-top:8px;color:var(--muted);line-height:1.6}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 13px;border-radius:999px;background:#effafb;border:1px solid #d8eef0;color:#21545d;font-size:13px}
    .service-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .service-item{border:1px solid var(--line);background:linear-gradient(180deg,#fff, #f8fcfc);border-radius:18px;padding:18px}
    .service-item h3{margin:0 0 8px;font-size:18px}
    .service-item p{margin:0;color:var(--muted);line-height:1.7;font-size:14px}
    .steps{counter-reset:step}
    .step{position:relative;padding-left:58px}
    .step:before{counter-increment:step;content:counter(step);position:absolute;left:0;top:0;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,#0ea5a6,#2563eb);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
    .table-wrap{overflow:auto;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 18px;border-bottom:1px solid #e6eef0;text-align:left;vertical-align:top}
    th{background:#f5fbfc;color:#24464d;font-size:14px}
    td{color:#35565e;line-height:1.7}
    .rating{background:linear-gradient(135deg,#effbff,#eefbf5);border:1px solid #d7edf6;border-radius:20px;padding:18px}
    .rating .score{font-size:42px;font-weight:800;color:#0b6f7b;line-height:1}
    details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:var(--shadow)}
    details+details{margin-top:12px}
    summary{cursor:pointer;font-weight:700;color:#173c46}
    details p{margin:12px 0 0;color:var(--muted);line-height:1.8}
    .testimonials{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .quote{position:relative}
    .quote:before{content:"“";position:absolute;right:18px;top:10px;font-size:54px;color:#d6ecee;line-height:1}
    .quote .role{color:#0b6f7b;font-weight:700;font-size:14px}
    .gallery{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .gallery .card{padding:14px}
    .gallery img{width:100%;border-radius:16px;aspect-ratio:4/3;object-fit:cover;background:#eaf4f4}
    .article-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .article{display:flex;justify-content:space-between;gap:14px;align-items:flex-start}
    .article span{color:var(--muted);font-size:13px}
    .form-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
    form{display:grid;gap:12px}
    input,select,textarea{width:100%;border:1px solid #cfe1e4;border-radius:14px;background:#fff;padding:13px 14px;font:inherit;color:var(--text);outline:none}
    textarea{min-height:130px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#0ea5a6;box-shadow:0 0 0 4px rgba(14,165,166,.12)}
    .footer{margin-top:18px;background:#0c2730;color:#d8eef1;padding:26px 0 30px}
    .footer a{color:#aee7eb}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
    .small{font-size:13px;color:var(--muted)}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .floating a,.floating button{width:48px;height:48px;border-radius:16px;border:none;display:flex;align-items:center;justify-content:center;box-shadow:0 14px 30px rgba(10,47,54,.2);cursor:pointer}
    .floating .chat{background:linear-gradient(135deg,#0ea5a6,#2563eb);color:#fff}
    .floating .top{background:#fff;color:#0b6f7b;border:1px solid var(--line)}
    .mobile-only{display:none}
    .reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .reveal.show{opacity:1;transform:translateY(0)}
    @media (max-width: 980px){
      .hero-grid,.form-grid,.footer-grid,.grid-4,.grid-3,.testimonials,.gallery{grid-template-columns:1fr 1fr}
      .hero-card{min-height:auto}
      .nav-links{display:none;position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)}
      .nav-links.open{display:flex;flex-direction:column;align-items:flex-start}
      .menu-toggle{display:flex}
      .mobile-only{display:inline-flex}
    }
    @media (max-width: 720px){
      .container{width:min(var(--container),calc(100% - 24px))}
      .hero-grid,.form-grid,.footer-grid,.grid-4,.grid-3,.grid-2,.testimonials,.gallery,.article-list,.grid-2,.service-list{grid-template-columns:1fr}
      .hero-card{padding:24px;border-radius:22px}
      .side-panel,.card{padding:18px}
      .section{padding:20px 0}
      .section-title{align-items:flex-start;flex-direction:column}
      h1{max-width:none}
      .nav{position:relative}
      .hero-stats{grid-template-columns:1fr 1fr}
    }