:root{
      --bg:#f5fbfb;
      --bg2:#eef8f8;
      --card:#ffffff;
      --text:#17303a;
      --muted:#5e7280;
      --line:#d9eaeb;
      --brand:#16a6a6;
      --brand2:#2f7cff;
      --accent:#0f8f86;
      --shadow:0 18px 50px rgba(12, 50, 58, .08);
      --radius:20px;
      --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;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(22,166,166,.11), transparent 26%),
        radial-gradient(circle at top right, rgba(47,124,255,.10), transparent 24%),
        linear-gradient(180deg, #f9fefe 0%, var(--bg) 42%, #f3f9f9 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .site-header{
      position:sticky; top:0; z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(245,251,251,.84);
      border-bottom:1px solid rgba(217,234,235,.9);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:16px;
      padding:12px 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;border:1px solid var(--line);padding:4px;box-shadow:0 8px 20px rgba(0,0,0,.04)}
    .brand-txt strong{display:block;font-size:16px;line-height:1.2}
    .brand-txt span{display:block;font-size:12px;color:var(--muted);margin-top:3px}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px;font-size:14px}
    .nav-links{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--muted);padding:8px 10px;border-radius:10px;transition:.2s}
    .nav-links a:hover{color:var(--text);background:rgba(22,166,166,.08)}
    .hero{padding:38px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.panel,.card,.quote,.faq-item,.form-box,.info-box,.compare{background:rgba(255,255,255,.88);border:1px solid rgba(217,234,235,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-main{padding:28px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{content:"";position:absolute;border-radius:50%;background:linear-gradient(135deg, rgba(22,166,166,.16), rgba(47,124,255,.08));filter:blur(4px)}
    .hero-main:before{width:220px;height:220px;right:-80px;top:-70px}
    .hero-main:after{width:180px;height:180px;right:40px;bottom:-110px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:linear-gradient(135deg, rgba(22,166,166,.12), rgba(47,124,255,.10));color:#0c5f68;font-size:13px;font-weight:600}
    h1{font-size:clamp(32px,4vw,52px);line-height:1.08;margin:18px 0 14px;letter-spacing:-.03em}
    .lead{font-size:16px;line-height:1.8;color:var(--muted);max-width:62ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:14px;border:1px solid transparent;font-weight:700;transition:.22s ease}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 16px 32px rgba(22,166,166,.22)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px);box-shadow:0 16px 28px rgba(14,38,44,.10)}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .mini{padding:14px;border-radius:16px;background:linear-gradient(180deg,#fff, #f7fbfb);border:1px solid var(--line)}
    .mini strong{display:block;font-size:18px}
    .mini span{display:block;margin-top:6px;color:var(--muted);font-size:13px;line-height:1.5}
    .hero-side{padding:18px;display:flex;flex-direction:column;gap:14px}
    .metric-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .metric{padding:16px;border-radius:16px;background:linear-gradient(180deg, #f8fefe, #ffffff);border:1px solid var(--line)}
    .metric strong{font-size:24px;display:block}
    .metric span{font-size:13px;color:var(--muted)}
    .side-note{padding:16px;border-radius:16px;background:linear-gradient(135deg, rgba(22,166,166,.08), rgba(47,124,255,.06));border:1px solid rgba(22,166,166,.15)}
    .section{padding:20px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:12px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:clamp(24px,2.4vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{padding:20px}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.72}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(22,166,166,.16), rgba(47,124,255,.14));
      color:#0d6671;font-weight:800;margin-bottom:12px
    }
    .chips{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#36505c;font-size:13px}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff, #f7fbfb);border:1px solid var(--line);position:relative}
    .step .n{display:inline-flex;width:30px;height:30px;border-radius:10px;align-items:center;justify-content:center;background:rgba(22,166,166,.12);color:#0d6671;font-weight:700;margin-bottom:12px}
    .table-wrap{overflow-x:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:820px}
    th,td{padding:15px 14px;border-bottom:1px solid var(--line);text-align:left;font-size:14px;vertical-align:top}
    th{background:#f5fbfb;color:#183642;font-size:13px;letter-spacing:.02em}
    tr:last-child td{border-bottom:none}
    .good{color:#0d7a6f;font-weight:700}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:12px;background:linear-gradient(135deg,#fff, #f3fbfb);border:1px solid var(--line);font-size:13px;color:#38525e}
    .review{display:flex;flex-direction:column;gap:10px}
    .stars{color:#f2b01e;letter-spacing:2px;font-size:16px}
    .quote{padding:18px}
    .quote .name{font-weight:700}
    .quote .role{font-size:13px;color:var(--muted);margin-top:2px}
    .faq{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px;background:transparent;border:0;color:var(--text);font-size:16px;font-weight:700;text-align:left;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease; padding:0 18px}
    .faq-item.open .faq-a{max-height:220px;padding-bottom:18px}
    .faq-a p{margin:0;color:var(--muted);line-height:1.8}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .article{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line);transition:.2s}
    .article:hover,.card:hover,.step:hover,.quote:hover,.panel:hover{transform:translateY(-3px)}
    .article small{color:#0d7a6f;font-weight:700}
    .article h3{margin:8px 0 10px;font-size:17px}
    .article p{margin:0;color:var(--muted);line-height:1.7}
    .form-box{padding:20px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .field{display:flex;flex-direction:column;gap:6px}
    .field.full{grid-column:1 / -1}
    label{font-size:13px;color:#35525d;font-weight:700}
    input,select,textarea{
      width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);font:inherit;outline:none;
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(22,166,166,.6);box-shadow:0 0 0 4px rgba(22,166,166,.10)}
    textarea{min-height:126px;resize:vertical}
    .footer{padding:18px 0 28px;color:#35525d}
    .footer-box{padding:20px;border-radius:20px;background:#f8fcfc;border:1px solid var(--line)}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
    .contact-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}
    .contact-list li{display:flex;gap:10px;color:#36505c;line-height:1.7}
    .contact-list b{min-width:84px}
    .float-bar{
      position:fixed;right:16px;bottom:18px;z-index:60;display:flex;flex-direction:column;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 14px 28px rgba(22,166,166,.24);border:0;cursor:pointer
    }
    .float-link{
      width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:#fff;border:1px solid var(--line);box-shadow:0 12px 24px rgba(12,50,58,.08)
    }
    .center-note{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding:16px 18px;border-radius:18px;background:linear-gradient(135deg, rgba(22,166,166,.10), rgba(47,124,255,.08));border:1px solid rgba(22,166,166,.14)}
    .menu-open .nav-links{display:flex}
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease, transform .6s ease}
    .reveal.show{opacity:1;transform:none}
    .section-anchor{scroll-margin-top:88px}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.articles,.footer-grid,.timeline{grid-template-columns:1fr}
      .hero-points{grid-template-columns:1fr}
      .nav-toggle{display:inline-flex}
      .nav-links{display:none;position:absolute;left:16px;right:16px;top:66px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow)}
      .nav{position:relative}
      .nav-links a{padding:10px 12px}
      form{grid-template-columns:1fr}
    }