:root{
      --bg:#f5f8fb;
      --bg2:#eef7f8;
      --card:#ffffff;
      --text:#173042;
      --muted:#5f7281;
      --line:#d8e5ea;
      --primary:#11b4b1;
      --primary2:#2563eb;
      --accent:#12d6a7;
      --shadow:0 12px 30px rgba(18,52,76,.08);
      --shadow2:0 18px 42px rgba(17,180,177,.12);
      --radius:20px;
      --radius2:26px;
      --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;background:linear-gradient(180deg,var(--bg) 0%,#fff 38%,var(--bg2) 100%);color:var(--text);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;background:rgba(245,248,251,.86);backdrop-filter:blur(16px);border-bottom:1px solid rgba(216,229,234,.8)}
    .nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:40px;height:40px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;box-shadow:0 8px 20px rgba(0,0,0,.06)}
    .brand strong{display:block;font-size:1.02rem;letter-spacing:.5px}
    .brand span{display:block;font-size:.82rem;color:var(--muted)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:14px;padding:10px 12px;color:var(--text)}
    .nav{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
    .nav a{font-size:.92rem;color:#29475d;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav a:hover,.nav a.active{background:rgba(17,180,177,.1);color:#0e7f7d}
    .home-link{padding:10px 14px;border-radius:999px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff !important;box-shadow:var(--shadow2)}
    main{overflow:hidden}
    section{padding:72px 0}
    .hero{padding:38px 0 34px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch}
    .hero-copy,.hero-panel,.card,.metric,.quote,.step,.faq-item,.article,.review,.compare,.service-tab,.timeline-item,.support-box,.form-box,.price-box{background:var(--card);border:1px solid rgba(216,229,234,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-copy{padding:34px;position:relative;overflow:hidden}
    .hero-copy:before{content:"";position:absolute;inset:auto -50px -60px auto;width:220px;height:220px;background:radial-gradient(circle,rgba(17,180,177,.18),transparent 68%);pointer-events:none}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:rgba(17,180,177,.1);color:#0d7270;font-size:.88rem;font-weight:600}
    h1{margin:16px 0 14px;font-size:clamp(2rem,4vw,3.4rem);line-height:1.12;letter-spacing:-.02em}
    .lead{margin:0;color:var(--muted);font-size:1.02rem;max-width:56ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:14px;font-weight:700;border:1px solid transparent;transition:.25s;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:var(--shadow2)}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--line)}
    .btn:hover,.card:hover,.review:hover,.article:hover,.step:hover,.faq-item:hover,.metric:hover,.compare:hover,.service-tab:hover,.timeline-item:hover,.support-box:hover,.form-box:hover,.price-box:hover{transform:translateY(-2px);box-shadow:0 16px 38px rgba(17,180,177,.12)}
    .hero-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:24px}
    .mini{padding:14px;border-radius:16px;background:linear-gradient(180deg,rgba(17,180,177,.08),rgba(255,255,255,.8));border:1px solid rgba(17,180,177,.12)}
    .mini strong{display:block;font-size:1rem}
    .mini span{display:block;color:var(--muted);font-size:.88rem;margin-top:4px}
    .hero-panel{padding:24px;display:grid;gap:14px;align-content:start;background:linear-gradient(180deg,#fff,rgba(238,247,248,.9))}
    .hero-panel .stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .metric{padding:18px}
    .metric b{display:block;font-size:1.45rem}
    .metric span{display:block;margin-top:4px;color:var(--muted);font-size:.9rem}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:8px 12px;border-radius:999px;background:#f3fbfc;border:1px solid #d8eef0;color:#24515d;font-size:.88rem}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:24px}
    .section-head h2{margin:0;font-size:clamp(1.55rem,2.8vw,2.3rem)}
    .section-head p{margin:0;color:var(--muted);max-width:64ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
    .card,.service-tab,.article,.review,.compare,.step,.faq-item,.timeline-item,.support-box,.form-box,.price-box{padding:22px}
    .card h3,.service-tab h3,.article h3,.review h3,.compare h3,.step h3,.faq-item summary,.timeline-item h3,.support-box h3,.form-box h3,.price-box h3{margin:0 0 10px;font-size:1.08rem}
    .card p,.service-tab p,.article p,.review p,.compare p,.step p,.timeline-item p,.support-box p,.form-box p,.price-box p{margin:0;color:var(--muted)}
    .icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(17,180,177,.14),rgba(37,99,235,.12));color:#0f7f7d;font-weight:800;margin-bottom:12px}
    .stats-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .stats-row .metric{padding:20px}
    .timeline{display:grid;gap:14px}
    .timeline-item{position:relative;padding-left:22px}
    .timeline-item:before{content:"";position:absolute;left:10px;top:28px;bottom:-14px;width:2px;background:linear-gradient(180deg,var(--primary),transparent)}
    .timeline-item:last-child:before{display:none}
    .timeline-item .dot{position:absolute;left:4px;top:24px;width:14px;height:14px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 0 0 5px rgba(17,180,177,.12)}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:15px 16px;border-bottom:1px solid #e6edf1;text-align:left;vertical-align:top}
    th{background:#f5fafb;color:#143548;font-size:.94rem}
    tr:last-child td{border-bottom:none}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:rgba(17,180,177,.1);color:#0c7471;font-size:.84rem;font-weight:700}
    .rating{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:10px 0 14px}
    .stars{color:#f59e0b;font-size:1.1rem;letter-spacing:2px}
    details{border-radius:18px}
    summary{list-style:none;cursor:pointer}
    summary::-webkit-details-marker{display:none}
    .faq-item{padding:0;overflow:hidden}
    .faq-item summary{padding:18px 22px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:12px}
    .faq-item summary:after{content:"+";font-size:1.3rem;color:#0f7f7d}
    .faq-item[open] summary:after{content:"–"}
    .faq-item .answer{padding:0 22px 18px;color:var(--muted)}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px}
    .review .role{color:#0d7471;font-size:.88rem;font-weight:700}
    .review .name{font-weight:800}
    .price-box .price{font-size:2rem;font-weight:900;color:#0f7f7d;margin:6px 0}
    .price-box ul{margin:14px 0 0;padding-left:18px;color:var(--muted)}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    .field label{font-size:.92rem;font-weight:700;color:#27475c}
    .field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none;transition:.2s}
    .field textarea{min-height:126px;resize:vertical}
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#87d8d6;box-shadow:0 0 0 4px rgba(17,180,177,.12)}
    .span-2{grid-column:span 2}
    .support-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .support-box .qr{width:132px;max-width:100%;border-radius:16px;border:1px solid var(--line);margin:14px 0}
    .floating{position:fixed;right:16px;bottom:16px;z-index:80;display:grid;gap:10px}
    .floating a,.floating button{border:none;display:flex;align-items:center;justify-content:center;min-width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:var(--shadow2);cursor:pointer}
    .backtop{opacity:0;pointer-events:none;transform:translateY(8px);transition:.25s}
    .backtop.show{opacity:1;pointer-events:auto;transform:translateY(0)}
    .site-footer{padding:28px 0 34px;border-top:1px solid rgba(216,229,234,.9);background:#f4fafb;color:#27475c}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.9rem;color:#29475d}
    .muted{color:var(--muted)}
    .article-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .article .date{color:#0e7f7d;font-size:.85rem;font-weight:700;margin-bottom:10px}
    .service-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .service-tab{min-height:100%}
    .center{text-align:center}
    .soft{background:linear-gradient(180deg,rgba(17,180,177,.05),rgba(37,99,235,.04))}
    @media (max-width: 1024px){
      .hero-grid,.grid-3,.grid-2,.stats-row,.support-grid,.article-list,.service-tabs,.footer-grid{grid-template-columns:1fr 1fr}
      .hero-copy{padding:28px}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      .nav{display:none;position:absolute;left:16px;right:16px;top:64px;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)}
      .nav.open{display:flex}
      .nav a{padding:12px 14px}
      .hero-grid,.grid-3,.grid-2,.stats-row,.support-grid,.article-list,.service-tabs,.footer-grid,.hero-points,.form-grid{grid-template-columns:1fr}
      .section-head{align-items:start;flex-direction:column}
      .hero-copy,.hero-panel,.card,.service-tab,.article,.review,.compare,.step,.faq-item,.timeline-item,.support-box,.form-box,.price-box{padding:18px}
      section{padding:54px 0}
      .span-2{grid-column:span 1}
      .hero{padding-top:22px}
      .hero-actions{gap:10px}
      .btn{width:100%}
      .hero-panel .stat-grid{grid-template-columns:1fr 1fr}
      .nav-wrap{position:relative}
    }
    .reveal{opacity:0;transform:translateY(16px);transition:.65s ease}
    .reveal.show{opacity:1;transform:none}