:root{
      --bg:#f4fbf6;
      --panel:#ffffff;
      --panel-2:#eefbf1;
      --line:#d6eadb;
      --text:#173221;
      --muted:#5f7468;
      --green:#18b45b;
      --green-2:#0f8f47;
      --accent:#9df06f;
      --shadow:0 18px 50px rgba(20, 70, 41, .10);
      --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,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(157,240,111,.24), transparent 28%),
        radial-gradient(circle at top right, rgba(24,180,91,.14), transparent 22%),
        linear-gradient(180deg, #f8fff9 0%, var(--bg) 44%, #f7fbf8 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    header{
      position:sticky; top:0; z-index:30;
      backdrop-filter:saturate(180%) blur(14px);
      background:rgba(244,251,246,.78);
      border-bottom:1px solid rgba(214,234,219,.75);
    }
    .topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px;box-shadow:0 6px 18px rgba(0,0,0,.05)}
    .brand h1,.brand .site-title{font-size:16px;line-height:1.15;margin:0;font-weight:800;letter-spacing:.2px}
    .brand p{margin:3px 0 0;color:var(--muted);font-size:12px}
    .nav-wrap{display:flex;align-items:center;gap:12px}
    .menu-btn{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px;font-weight:700}
    nav{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
    nav a{font-size:13px;color:#355343;padding:9px 10px;border-radius:999px;transition:.2s ease}
    nav a:hover, nav a.active{background:var(--panel);box-shadow:0 8px 20px rgba(24,180,91,.10);color:var(--green-2)}
    .home-link{
      display:inline-flex;align-items:center;justify-content:center;
      padding:10px 16px;border-radius:999px;background:linear-gradient(135deg,var(--green),var(--green-2));
      color:#fff!important;font-weight:800;box-shadow:0 12px 26px rgba(24,180,91,.25)
    }
    main{overflow:hidden}
    section{padding:72px 0}
    .hero{padding:36px 0 56px}
    .hero-grid{display:grid;grid-template-columns:1.25fr .85fr;gap:22px;align-items:stretch}
    .hero-card,.info-card,.section-card,.feature-card,.review-card,.faq-item,.compare-card,.form-card,.aside-card,.article-card,.case-card,.step-card,.stat-card{
      background:rgba(255,255,255,.9);
      border:1px solid rgba(214,234,219,.92);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-card{padding:34px;position:relative;overflow:hidden}
    .hero-card::before,.hero-card::after{
      content:"";position:absolute;border-radius:999px;filter:blur(2px);pointer-events:none
    }
    .hero-card::before{width:220px;height:220px;background:rgba(157,240,111,.25);right:-50px;top:-60px}
    .hero-card::after{width:140px;height:140px;background:rgba(24,180,91,.14);right:120px;bottom:-40px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;background:#e9fbef;border:1px solid #cff0d9;border-radius:999px;color:var(--green-2);font-weight:700;font-size:13px}
    .hero h2{font-size:clamp(32px,5vw,52px);line-height:1.06;margin:18px 0 14px;letter-spacing:-.6px}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.85;max-width:62ch}
    .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:1px solid transparent;border-radius:14px;padding:13px 18px;font-weight:800;transition:.22s ease;cursor:pointer
    }
    .btn-primary{background:linear-gradient(135deg,var(--green),var(--green-2));color:#fff;box-shadow:0 14px 30px rgba(24,180,91,.22)}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--line)}
    .btn:hover,.feature-card:hover,.review-card:hover,.article-card:hover,.case-card:hover,.step-card:hover,.faq-item:hover,.stat-card:hover,.compare-card:hover,.form-card:hover{transform:translateY(-3px)}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .hero-mini{padding:14px 14px 16px;border-radius:18px;background:linear-gradient(180deg,#f6fff8,#fff);border:1px solid #d6eadb}
    .hero-mini strong{display:block;font-size:18px;margin-bottom:4px}
    .hero-mini span{color:var(--muted);font-size:13px;line-height:1.6}
    .hero-side{display:grid;gap:14px}
    .side-top,.side-bottom{padding:22px}
    .side-top h3,.section-head h2{margin:0 0 8px;font-size:24px}
    .side-top p,.section-head p{margin:0;color:var(--muted);line-height:1.8}
    .badge-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
    .badge{padding:8px 12px;background:#eefbf1;border:1px solid #d4ecda;border-radius:999px;font-size:13px;color:#29513a}
    .stat-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.network-grid,.step-grid{display:grid;gap:16px}
    .stat-grid{grid-template-columns:repeat(4,1fr)}
    .stat-card{padding:20px}
    .stat-card strong{display:block;font-size:30px;line-height:1;color:var(--green-2)}
    .stat-card span{display:block;margin-top:8px;color:var(--muted);line-height:1.6}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:22px}
    .section-head .sub{max-width:62ch}
    .feature-grid{grid-template-columns:repeat(3,1fr)}
    .feature-card{padding:22px}
    .feature-card h3,.case-card h3,.review-card h3,.article-card h3,.faq-item summary,.step-card h3{margin:0 0 10px;font-size:18px}
    .feature-card p,.case-card p,.review-card p,.article-card p,.step-card p,.compare-card p,.aside-card p{margin:0;color:var(--muted);line-height:1.8}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;margin-bottom:14px;
      background:linear-gradient(135deg,#e8fff1,#f7fff9);border:1px solid #d8efdf;color:var(--green-2);font-size:20px;font-weight:900
    }
    .split{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .section-card{padding:24px}
    .list{display:grid;gap:12px;margin:16px 0 0;padding:0;list-style:none}
    .list li{display:flex;gap:10px;align-items:flex-start;color:var(--muted);line-height:1.75}
    .check{width:22px;height:22px;border-radius:50%;background:#e8fff1;border:1px solid #d4ecda;display:grid;place-items:center;color:var(--green-2);flex:0 0 22px;margin-top:2px}
    .step-grid{grid-template-columns:repeat(4,1fr)}
    .step-card{padding:22px;position:relative}
    .step-num{font-size:12px;font-weight:900;color:var(--green-2);letter-spacing:.18em;text-transform:uppercase}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:820px}
    th,td{padding:16px 14px;text-align:left;border-bottom:1px solid #e6f1e9;font-size:14px;vertical-align:top}
    th{background:#effbf2;color:#254636}
    tr:last-child td{border-bottom:none}
    .rating{display:inline-flex;align-items:center;gap:8px;font-weight:800;color:#134f2d}
    .stars{color:#f0b429;letter-spacing:2px}
    .compare-card{padding:24px}
    .compare-box{display:grid;grid-template-columns:1fr .9fr;gap:18px}
    .highlight{
      padding:20px;border-radius:18px;background:linear-gradient(180deg,#f1fff4,#fff);border:1px solid #d7eedf
    }
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:8px 12px;background:#fff;border:1px solid #dbeadd;border-radius:999px;color:#355343;font-size:13px}
    .faq-list{display:grid;gap:12px}
    .faq-item{padding:0;overflow:hidden}
    .faq-item summary{list-style:none;padding:18px 20px;cursor:pointer;display:flex;justify-content:space-between;gap:14px;align-items:center}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item .answer{padding:0 20px 18px;color:var(--muted);line-height:1.8}
    .form-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:start}
    form{display:grid;gap:12px}
    .field{display:grid;gap:8px}
    .field label{font-size:13px;font-weight:700;color:#2d4a39}
    .field input,.field select,.field textarea{
      width:100%;border:1px solid #d8e8dc;background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:.2s ease
    }
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#87d9a2;box-shadow:0 0 0 4px rgba(24,180,91,.10)}
    .field textarea{min-height:120px;resize:vertical}
    .contact-box{display:grid;gap:12px}
    .qr{display:grid;grid-template-columns:120px 1fr;gap:14px;align-items:center;padding:16px;border:1px solid #d8e8dc;border-radius:18px;background:#fff}
    .qr img{width:120px;height:120px;object-fit:cover;border-radius:16px;border:1px solid #e5efe7}
    .article-grid{grid-template-columns:repeat(3,1fr)}
    .article-card,.case-card,.review-card{padding:20px}
    .meta{font-size:12px;color:#6b7f73;margin-bottom:10px}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a,.mini-links a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid #dbeadd;color:#2f4d3b;font-size:13px}
    footer{padding:24px 0 28px;border-top:1px solid rgba(214,234,219,.9);background:rgba(245,251,246,.95)}
    .footer-top{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;align-items:start}
    .footer-note{color:var(--muted);line-height:1.8;font-size:14px}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:40;display:grid;gap:10px
    }
    .float-btn{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--green),var(--green-2));color:#fff;display:grid;place-items:center;box-shadow:0 14px 26px rgba(24,180,91,.24)}
    .float-btn.secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .55s ease, transform .55s ease}
    .reveal.in{opacity:1;transform:translateY(0)}
    .sticky-cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
    .pill{display:inline-flex;align-items:center;gap:8px;padding:9px 12px;border-radius:999px;background:#f2fbf4;border:1px solid #d8eadc;font-size:13px;color:#335544}
    .divider{height:1px;background:#e1efe4;margin:18px 0}
    .small{font-size:13px;color:var(--muted);line-height:1.7}
    .compare-score{font-size:42px;font-weight:900;color:var(--green-2);line-height:1}
    @media (max-width: 980px){
      .hero-grid,.split,.compare-box,.form-grid,.footer-top,.stat-grid,.feature-grid,.article-grid,.case-grid,.review-grid,.step-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .hero-points{grid-template-columns:1fr}
      .menu-btn{display:inline-flex}
      nav{display:none;position:absolute;left:0;right:0;top:100%;background:rgba(244,251,246,.98);padding:14px 16px 18px;border-bottom:1px solid var(--line);box-shadow:0 14px 30px rgba(0,0,0,.05)}
      nav.open{display:flex;flex-direction:column;align-items:stretch}
      nav a{background:#fff;border:1px solid var(--line)}
      .topbar{position:relative}
      .compare-box{gap:12px}
    }
    @media (max-width: 640px){
      section{padding:56px 0}
      .hero-card,.section-card,.feature-card,.review-card,.article-card,.case-card,.step-card,.compare-card,.form-card,.aside-card{border-radius:18px}
      .hero-card{padding:24px}
      .qr{grid-template-columns:1fr}
      .qr img{width:100%;height:auto;max-height:240px}
      .hero h2{font-size:30px}
    }