:root{
      --bg:#f6fbfb;
      --panel:#ffffff;
      --panel-2:#eff8f7;
      --line:#d7e9e6;
      --text:#17313a;
      --muted:#57707a;
      --brand:#0f766e;
      --brand-2:#0ea5a3;
      --brand-3:#3bc6c0;
      --accent:#f59e0b;
      --shadow:0 18px 45px rgba(18, 61, 66, .08);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(14,165,163,.10), transparent 30%),
        radial-gradient(circle at top right, rgba(59,198,192,.08), transparent 24%),
        linear-gradient(180deg,#f8fcfc 0%, #f4fbfa 40%, #f7fbfd 100%);
      line-height:1.65;
    }
    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(16px);
      background:rgba(246,251,251,.84);
      border-bottom:1px solid rgba(215,233,230,.72);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:18px;
      min-height:72px;
    }
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:10px;background:#fff;padding:4px;border:1px solid var(--line)}
    .brand strong{display:block;font-size:1.05rem;line-height:1.1}
    .brand span{display:block;font-size:.84rem;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;align-items:center;gap:14px;justify-content:flex-end}
    .nav-links a{font-size:.95rem;color:var(--text);padding:8px 10px;border-radius:10px;transition:.2s ease}
    .nav-links a:hover{background:rgba(15,118,110,.08);color:var(--brand)}
    .nav-actions{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:11px 16px;
      font-weight:700;cursor:pointer;transition:.22s ease;white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 12px 28px rgba(15,118,110,.18)}
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 32px rgba(15,118,110,.24)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:#a8d6d1;background:var(--panel-2)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;width:44px;height:44px}
    .menu-toggle span{display:block;width:18px;height:2px;background:var(--text);margin:4px auto;border-radius:2px}
    .hero{padding:34px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:stretch}
    .hero-copy,.hero-side,.card,.section-card,.faq-item,.review-card,.news-card,.service-pill,.metric,.table-wrap,.form-card,.timeline-item{
      background:var(--panel);border:1px solid rgba(215,233,230,.92);border-radius:var(--radius);box-shadow:var(--shadow)
    }
    .hero-copy{padding:28px;position:relative;overflow:hidden}
    .hero-copy:before{
      content:"";position:absolute;inset:auto -40px -50px auto;width:220px;height:220px;border-radius:50%;
      background:radial-gradient(circle, rgba(14,165,163,.16), transparent 62%);
    }
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--brand);background:rgba(15,118,110,.08);padding:7px 12px;border-radius:999px;font-weight:700;font-size:.9rem}
    h1{margin:14px 0 12px;font-size:clamp(2rem,4vw,3.65rem);line-height:1.08;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:1.02rem;max-width:52rem}
    .hero-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:22px 0}
    .hero-point{background:linear-gradient(180deg,#fbfefe,#f3fbfa);border:1px solid var(--line);border-radius:16px;padding:14px}
    .hero-point strong{display:block;margin-bottom:4px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-side{padding:22px;display:grid;gap:14px}
    .metric-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:24px 0 0}
    .metric{padding:18px}
    .metric strong{display:block;font-size:1.55rem;color:var(--brand)}
    .metric span{display:block;color:var(--muted);font-size:.92rem}
    section{padding:22px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:clamp(1.35rem,2.2vw,2rem)}
    .section-head p{margin:0;color:var(--muted);max-width:54rem}
    .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{padding:20px}
    .card h3{margin:0 0 10px;font-size:1.08rem}
    .card p,.card li,.section-card p,.section-card li{color:var(--muted)}
    .icon{
      width:46px;height:46px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(15,118,110,.1),rgba(14,165,163,.16));color:var(--brand);font-weight:800;margin-bottom:12px
    }
    .pill-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .pill{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--text);font-size:.92rem}
    .section-card{padding:22px}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#ffffff,#f3fbfa);border:1px solid var(--line)}
    .step .num{display:inline-flex;width:32px;height:32px;border-radius:50%;align-items:center;justify-content:center;background:rgba(15,118,110,.12);color:var(--brand);font-weight:800;margin-bottom:10px}
    .table-wrap{overflow:auto;padding:0}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 18px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left}
    th{background:#f4fbfa;color:var(--text);font-size:.95rem}
    tr:hover td{background:#fcfefe}
    .badge{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;background:rgba(15,118,110,.1);color:var(--brand);font-size:.86rem;font-weight:700}
    .rating{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
    .star{color:#f59e0b;font-size:1.05rem}
    .compare-top{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}
    .score-box{padding:22px;background:linear-gradient(135deg,#ffffff,#eef9f8);border-radius:var(--radius);border:1px solid var(--line)}
    .score-box strong{font-size:2rem;color:var(--brand)}
    .accordion{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;text-align:left;background:transparent;border:0;padding:18px 20px;font-size:1rem;font-weight:700;color:var(--text);display:flex;justify-content:space-between;align-items:center;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 20px}
    .faq-item.active .faq-a{max-height:180px;padding-bottom:18px}
    .faq-item.active .faq-q .chev{transform:rotate(180deg)}
    .chev{transition:transform .25s ease;color:var(--brand)}
    .review-card{padding:18px}
    .review-card .meta{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .avatar{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,rgba(14,165,163,.18),rgba(15,118,110,.08));color:var(--brand);font-weight:800}
    .news-list{display:grid;gap:12px}
    .news-card{padding:16px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px}
    .news-card small{color:var(--muted)}
    .form-card{padding:22px}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:grid;gap:8px}
    label{font-weight:700;font-size:.95rem}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text);
      font:inherit;outline:none;transition:.2s ease
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(15,118,110,.5);box-shadow:0 0 0 4px rgba(15,118,110,.08)}
    textarea{min-height:128px;resize:vertical}
    .full{grid-column:1/-1}
    .footer{
      margin-top:18px;background:#0f2f33;color:#e9f7f6;border-top:1px solid rgba(255,255,255,.08)
    }
    .footer a{color:#c9fffb}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr .9fr;gap:16px;padding:30px 0}
    .footer .muted{color:#c3dcda}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:14px 0;color:#b8d0ce;font-size:.92rem}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:50%;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 12px 26px rgba(15,118,110,.24);border:0
    }
    .float-panel{
      position:fixed;right:16px;bottom:82px;z-index:60;background:#fff;border:1px solid var(--line);border-radius:18px;
      box-shadow:var(--shadow);padding:14px;width:min(320px,calc(100vw - 32px));display:none
    }
    .float-panel.open{display:block}
    .float-panel img{border-radius:14px;border:1px solid var(--line)}
    .timeline{display:grid;gap:12px}
    .timeline-item{padding:16px 18px}
    .timeline-item strong{display:block;margin-bottom:6px}
    .link-list{display:flex;flex-wrap:wrap;gap:10px}
    .link-list a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line)}
    .muted{color:var(--muted)}
    .scroll-reveal{opacity:0;transform:translateY(14px);transition:all .55s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    @media (max-width: 1024px){
      .hero-grid,.compare-top,.footer-grid,.grid-3,.steps,.metric-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .nav-links{display:none}
      .menu-toggle{display:inline-grid;place-items:center}
      .nav.open .nav-links{
        display:flex;position:absolute;left:16px;right:16px;top:72px;flex-direction:column;align-items:flex-start;padding:14px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)
      }
      .nav{position:relative}
    }
    @media (max-width: 720px){
      .hero-grid,.compare-top,.grid-3,.grid-2,.steps,.metric-grid,.footer-grid,.form-grid,.hero-points{grid-template-columns:1fr}
      .hero-copy,.hero-side,.section-card,.form-card{padding:18px}
      .hero-actions{flex-direction:column}
      .btn{width:100%}
      .section-head{flex-direction:column;align-items:flex-start}
      .nav-actions .btn-ghost{display:none}
    }