:root{
      --bg:#f6fbf8;
      --bg2:#eef8f1;
      --card:#ffffff;
      --text:#173128;
      --muted:#5f6f68;
      --line:#dceae1;
      --brand:#39b78f;
      --brand2:#7ed8b8;
      --accent:#2f8f74;
      --gold:#d3a85d;
      --shadow:0 18px 50px rgba(24, 65, 51, .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(126,216,184,.18), transparent 28%),
        radial-gradient(circle at top right, rgba(57,183,143,.12), transparent 24%),
        linear-gradient(180deg, var(--bg) 0%, #fbfdfb 40%, #f7fbf8 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--container);margin:0 auto;padding:0 18px}
    .site-header{
      position:sticky;top:0;z-index:60;
      backdrop-filter:blur(14px);
      background:rgba(246,251,248,.82);
      border-bottom:1px solid rgba(220,234,225,.85);
    }
    .header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:76px}
    .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;padding:4px;border:1px solid var(--line)}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:16px;letter-spacing:.4px}
    .brand-text span{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text)}
    .nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav a{font-size:14px;color:#274337;padding:8px 0;position:relative}
    .nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--brand);transition:.25s}
    .nav a:hover::after,.nav a:focus::after{width:100%}
    .nav .cta-mini{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;padding:10px 14px;border-radius:999px;box-shadow:0 10px 24px rgba(57,183,143,.2)}
    main{display:block}
    .section{padding:74px 0}
    .hero{padding:34px 0 52px}
    .hero-grid{display:grid;grid-template-columns:1.22fr .78fr;gap:24px;align-items:stretch}
    .hero-panel,.side-panel,.card,.metric,.quote,.faq-item,.form-panel,.timeline-item,.price-card,.compare-card,.article-card,.review-card,.case-card,.network-card,.help-card{
      background:linear-gradient(180deg, rgba(255,255,255,.98), rgba(247,252,249,.98));
      border:1px solid rgba(220,234,225,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-panel{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#e8f7ef;color:var(--accent);border:1px solid #cfeadd;border-radius:999px;padding:8px 12px;font-size:13px;font-weight:600}
    h1{margin:16px 0 14px;font-size:clamp(32px,5vw,56px);line-height:1.08;letter-spacing:-.02em}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:14px;padding:13px 18px;font-weight:700;border:1px solid transparent;transition:.25s;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;box-shadow:0 12px 28px rgba(57,183,143,.22)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover,.btn:focus{transform:translateY(-2px)}
    .hero-highlights{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}
    .mini-stat{padding:16px;border-radius:16px;background:linear-gradient(180deg,#f6fcf8,#fff);border:1px solid var(--line)}
    .mini-stat strong{display:block;font-size:22px;margin-bottom:4px}
    .mini-stat span{font-size:13px;color:var(--muted);line-height:1.6}
    .side-panel{padding:22px;display:flex;flex-direction:column;gap:14px}
    .side-top{padding:18px;border-radius:18px;background:linear-gradient(135deg,#eafaf2,#f8fdf9);border:1px solid var(--line)}
    .side-top h2{margin:0 0 10px;font-size:20px}
    .side-top p{margin:0;color:var(--muted);line-height:1.7}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#355246}
    .side-stack{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .side-stack .metric{padding:16px}
    .metric small{display:block;color:var(--muted);font-size:12px}
    .metric strong{display:block;margin-top:8px;font-size:20px}
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:24px}
    .section-title h2{margin:0;font-size:clamp(24px,3.3vw,36px)}
    .section-title p{margin:0;color:var(--muted);max-width:720px;line-height:1.8}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .card{padding:22px}
    .card h3,.review-card h3,.case-card h3,.compare-card h3,.price-card h3,.help-card h3{margin:0 0 10px;font-size:18px}
    .card p,.review-card p,.case-card p,.price-card p,.help-card p{margin:0;color:var(--muted);line-height:1.75}
    .icon-badge{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#e8faf1,#d7f2e5);color:var(--accent);font-weight:800;margin-bottom:14px}
    .workflow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{padding:22px;position:relative}
    .step .num{font-size:12px;font-weight:800;color:var(--accent);letter-spacing:.1em}
    .step h3{margin:10px 0 8px}
    .step:not(:last-child)::after{content:"";position:absolute;right:-10px;top:38px;width:20px;height:2px;background:linear-gradient(90deg,var(--brand),transparent)}
    .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:780px}
    th,td{padding:16px 18px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f2fbf6;font-size:14px}
    tr:last-child td{border-bottom:none}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#e9f8f0;color:var(--accent);font-size:12px;font-weight:700}
    .compare-top{display:grid;grid-template-columns:.92fr 1.08fr;gap:16px;align-items:stretch}
    .compare-score{padding:24px}
    .score-box{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:16px 0 10px}
    .stars{color:#d39d4c;letter-spacing:2px;font-size:18px}
    .score{font-size:34px;font-weight:900;color:var(--accent)}
    .review-meta{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:14px}
    .review-card .role{font-size:13px;color:var(--accent);font-weight:700}
    .cases{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .case-card{padding:22px}
    .case-card ul{margin:14px 0 0;padding-left:18px;color:var(--muted);line-height:1.8}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article-card{padding:20px}
    .article-card a{display:block;margin-top:12px;color:var(--accent);font-weight:700}
    .article-card time{display:inline-block;margin-bottom:10px;color:var(--muted);font-size:12px}
    .form-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:start}
    .form-panel,.help-card,.network-card{padding:24px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:block;font-size:14px;font-weight:700;margin:0 0 8px}
    input,select,textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;padding:13px 14px;font:inherit;color:var(--text);
      outline:none;transition:.2s;
    }
    textarea{min-height:120px;resize:vertical;grid-column:1/-1}
    input:focus,select:focus,textarea:focus{border-color:rgba(57,183,143,.7);box-shadow:0 0 0 4px rgba(57,183,143,.12)}
    .form-actions{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:12px;align-items:center}
    .form-note{color:var(--muted);font-size:13px}
    .contact-list{display:grid;gap:12px}
    .contact-item{display:flex;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px dashed var(--line)}
    .contact-item:last-child{border-bottom:none}
    .contact-item span{color:var(--muted)}
    .faq{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;background:none;border:none;padding:18px 20px;text-align:left;font:inherit;color:var(--text);display:flex;align-items:center;justify-content:space-between;gap:16px;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 20px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{padding-bottom:18px;max-height:220px}
    .faq-item .plus{font-size:22px;color:var(--accent);transition:.25s}
    .faq-item.open .plus{transform:rotate(45deg)}
    .floating{
      position:fixed;right:16px;bottom:18px;z-index:70;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(--accent));color:#fff;box-shadow:0 14px 30px rgba(57,183,143,.28);border:none;cursor:pointer}
    .float-link{width:auto;padding:0 14px;height:52px;border-radius:16px;background:#fff;border:1px solid var(--line);color:var(--text);display:flex;align-items:center;gap:8px;box-shadow:var(--shadow)}
    .backtop{opacity:0;pointer-events:none;transform:translateY(10px);transition:.25s}
    .backtop.show{opacity:1;pointer-events:auto;transform:none}
    .site-footer{padding:24px 0 30px;border-top:1px solid var(--line);background:#eff8f2;color:#244135}
    .footer-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:start}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 12px;background:#fff;border:1px solid var(--line);border-radius:999px}
    .copyright{margin-top:14px;color:#567265;font-size:13px;line-height:1.7}
    .img-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .img-card{border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    .img-card img{width:100%;height:auto}
    .services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .price-card{padding:22px}
    .price-card ul{margin:14px 0 0;padding-left:18px;color:var(--muted);line-height:1.8}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .timeline-item{padding:20px}
    .timeline-item .time{color:var(--accent);font-weight:800;font-size:13px}
    .timeline-item h3{margin:10px 0 8px}
    .network-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:16px}
    .quote{padding:22px;border-left:4px solid var(--brand)}
    .comments-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review-card{padding:20px}
    .review-card .stars{font-size:15px}
    .blur-dot{position:absolute;border-radius:999px;filter:blur(10px);pointer-events:none}
    .hero-panel,.side-panel,.card,.metric,.quote,.faq-item,.form-panel,.timeline-item,.price-card,.compare-card,.article-card,.review-card,.case-card,.network-card,.help-card{position:relative;overflow:hidden}
    .hero-panel::before,.card::before,.metric::before,.quote::before,.price-card::before,.review-card::before,.case-card::before,.network-card::before,.help-card::before{
      content:"";position:absolute;inset:auto -40px -40px auto;width:120px;height:120px;border-radius:50%;
      background:radial-gradient(circle, rgba(126,216,184,.2), transparent 65%);
      pointer-events:none;
    }
    .reveal{opacity:0;transform:translateY(18px);transition:.7s ease}
    .reveal.show{opacity:1;transform:none}
    .divider{height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent);margin:18px 0}
    @media (max-width: 1024px){
      .hero-grid,.compare-top,.form-wrap,.footer-grid,.network-grid,.services-grid,.grid-4,.grid-3,.workflow,.cases,.article-list,.comments-grid,.price-grid,.timeline{grid-template-columns:1fr 1fr}
      .faq{grid-template-columns:1fr}
    }
    @media (max-width: 760px){
      .header-inner{min-height:68px}
      .nav-toggle{display:inline-flex}
      .nav{display:none;position:absolute;left:18px;right:18px;top:76px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:var(--shadow);flex-direction:column;align-items:flex-start}
      .nav.open{display:flex}
      .hero-grid,.compare-top,.form-wrap,.footer-grid,.network-grid,.services-grid,.grid-4,.grid-3,.workflow,.cases,.article-list,.comments-grid,.price-grid,.timeline,.hero-highlights{grid-template-columns:1fr}
      .hero-panel{padding:24px}
      .section{padding:56px 0}
      .step:not(:last-child)::after{display:none}
      .side-stack{grid-template-columns:1fr 1fr}
      .hero-actions,.section-title{align-items:flex-start}
      .section-title{flex-direction:column}
      form{grid-template-columns:1fr}
      .float-link{display:none}
    }