:root{
      --bg:#f7f4ef;
      --bg2:#eef3ff;
      --card:#ffffff;
      --text:#122033;
      --muted:#5d687a;
      --line:#d8e0ef;
      --brand:#1d4ed8;
      --brand2:#f97316;
      --accent:#06b6d4;
      --good:#0f9d58;
      --shadow:0 18px 50px rgba(19, 43, 89, .10);
      --shadow2:0 10px 24px rgba(19, 43, 89, .08);
      --radius:20px;
      --radius2:28px;
      --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 10% 10%, rgba(29,78,216,.12), transparent 24%),
        radial-gradient(circle at 85% 15%, rgba(249,115,22,.10), transparent 22%),
        linear-gradient(180deg, #fbfaf7 0%, #f3f7ff 46%, #f7f4ef 100%);
      line-height:1.6;
    }
    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:saturate(150%) blur(14px);
      background:rgba(247,244,239,.82);
      border-bottom:1px solid rgba(216,224,239,.8);
    }
    .header-inner{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:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;padding:6px;box-shadow:var(--shadow2)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:15px;letter-spacing:.4px}
    .brand-text span{display:block;font-size:12px;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:12px;flex-wrap:wrap;justify-content:flex-end}
    .nav a{font-size:13px;color:var(--muted);padding:8px 10px;border-radius:999px;transition:.25s}
    .nav a:hover,.nav a:focus{background:#fff;color:var(--brand);box-shadow:var(--shadow2)}
    .hero{
      padding:34px 0 24px;
      position:relative;
      overflow:hidden;
    }
    .hero-shell{
      background:linear-gradient(135deg, rgba(255,255,255,.88), rgba(240,246,255,.88));
      border:1px solid rgba(216,224,239,.9);
      border-radius:32px;
      box-shadow:var(--shadow);
      padding:28px;
      position:relative;
    }
    .hero-shell:before,.hero-shell:after{
      content:"";
      position:absolute;border-radius:50%;
      filter:blur(4px);
      pointer-events:none;
    }
    .hero-shell:before{width:190px;height:190px;background:radial-gradient(circle, rgba(29,78,216,.14), transparent 68%);right:-38px;top:-28px}
    .hero-shell:after{width:220px;height:220px;background:radial-gradient(circle, rgba(249,115,22,.12), transparent 68%);left:-52px;bottom:-72px}
    .hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:stretch;position:relative;z-index:1}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;background:rgba(29,78,216,.08);color:#1e40af;border-radius:999px;font-size:13px;font-weight:600}
    h1{font-size:clamp(32px,5vw,56px);line-height:1.08;margin:16px 0 14px;letter-spacing:-.02em}
    .lead{font-size:16px;color:var(--muted);max-width:62ch;margin:0 0 18px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 18px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:13px 18px;border-radius:16px;border:1px solid transparent;
      font-weight:700;font-size:14px;transition:.25s;cursor:pointer;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f46e5);color:#fff;box-shadow:0 14px 30px rgba(29,78,216,.26)}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--line)}
    .btn-accent{background:linear-gradient(135deg,var(--brand2),#fb7185);color:#fff}
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow2)}
    .hero-badges{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#334155}
    .hero-panel{
      background:linear-gradient(180deg, rgba(255,255,255,.92), rgba(248,250,255,.95));
      border:1px solid rgba(216,224,239,.95);
      border-radius:26px;
      padding:18px;
      display:grid;
      gap:14px;
      box-shadow:var(--shadow2);
    }
    .mini-stat{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px
    }
    .stat-card,.service-card,.info-card,.review-card,.case-card,.flow-card,.compare-card,.tag-cloud,.form-card,.faq-item,.article-card,.network-card,.price-card{
      background:var(--card);
      border:1px solid rgba(216,224,239,.95);
      border-radius:var(--radius);
      box-shadow:0 10px 28px rgba(16,35,74,.06);
    }
    .stat-card{padding:16px;transition:.25s}
    .stat-card strong{display:block;font-size:24px;line-height:1.1;margin-bottom:4px}
    .stat-card span{font-size:13px;color:var(--muted)}
    section{padding:18px 0}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px;line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:72ch}
    .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}
    .service-card,.info-card,.case-card,.flow-card,.compare-card,.review-card,.article-card,.price-card,.network-card,.form-card{padding:18px}
    .service-card h3,.info-card h3,.case-card h3,.flow-card h3,.compare-card h3,.review-card h3,.article-card h3,.price-card h3,.network-card h3{margin:0 0 8px;font-size:18px}
    .service-card p,.info-card p,.case-card p,.flow-card p,.review-card p,.article-card p,.network-card p,.price-card p{margin:0;color:var(--muted)}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(29,78,216,.12), rgba(6,182,212,.12));
      color:#1d4ed8;font-weight:800;margin-bottom:12px
    }
    .stats-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .section-soft{
      background:linear-gradient(180deg, rgba(255,255,255,.55), rgba(243,247,255,.72));
      border-top:1px solid rgba(216,224,239,.7);
      border-bottom:1px solid rgba(216,224,239,.7);
    }
    .tag-cloud{padding:18px}
    .tags{display:flex;flex-wrap:wrap;gap:10px}
    .tags span,.tags a{display:inline-flex;padding:9px 12px;border-radius:999px;background:#f8fbff;border:1px solid #dbe5f5;color:#334155;font-size:13px}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:16px;background:#fff}
    .timeline-item b{min-width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,#1d4ed8,#f97316);color:#fff;display:grid;place-items:center}
    .compare-wrap{overflow:auto;border-radius:20px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 12px;border-bottom:1px solid #e5ebf6;text-align:left;vertical-align:top}
    th{background:#f8fbff;font-size:14px}
    .score-pill{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border-radius:999px;background:rgba(15,157,88,.10);color:#0f5f38;font-weight:700;font-size:13px}
    .review-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review-card .meta{display:flex;justify-content:space-between;gap:10px;margin-top:12px;color:var(--muted);font-size:13px}
    .stars{color:#f59e0b;letter-spacing:2px}
    .faq{display:grid;gap:12px}
    .faq-item summary{list-style:none;cursor:pointer;padding:18px 18px 18px 48px;position:relative;font-weight:700}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary:before{
      content:"＋";position:absolute;left:18px;top:16px;width:22px;height:22px;border-radius:7px;background:#eff6ff;color:#1d4ed8;display:grid;place-items:center;font-size:14px
    }
    .faq-item[open] summary:before{content:"－"}
    .faq-item .answer{padding:0 18px 18px 48px;color:var(--muted)}
    .articles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .article-card ul{margin:12px 0 0;padding:0;list-style:none;display:grid;gap:10px}
    .article-card li{padding-left:14px;position:relative;color:var(--muted)}
    .article-card li:before{content:"•";position:absolute;left:0;color:#1d4ed8}
    .footer{
      margin-top:18px;
      padding:28px 0 24px;
      background:#0f172a;
      color:#e2e8f0;
    }
    .footer a{color:#dbeafe}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px}
    .footer .box{background:rgba(255,255,255,.05);border:1px solid rgba(148,163,184,.22);border-radius:22px;padding:18px}
    .footer .box h3{margin:0 0 10px;font-size:18px;color:#fff}
    .footer .box p,.footer .box li{color:#cbd5e1}
    .footer ul{margin:0;padding-left:18px}
    .copyright{margin-top:16px;padding-top:14px;border-top:1px solid rgba(148,163,184,.22);font-size:13px;color:#cbd5e1}
    .fixed-actions{
      position:fixed;right:16px;bottom:16px;z-index:55;display:grid;gap:10px
    }
    .float-btn{
      width:50px;height:50px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg,#1d4ed8,#06b6d4);color:#fff;box-shadow:var(--shadow);border:none;cursor:pointer
    }
    .kefu-panel{
      position:fixed;left:16px;bottom:16px;z-index:54;max-width:260px;
      background:#fff;border:1px solid var(--line);border-radius:20px;padding:14px;box-shadow:var(--shadow);display:grid;gap:10px
    }
    .kefu-panel img{width:100%;border-radius:14px;border:1px solid var(--line)}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .form-grid .full{grid-column:1 / -1}
    label{display:block;font-size:13px;color:#334155;margin:0 0 6px}
    input,select,textarea{
      width:100%;padding:12px 14px;border-radius:14px;border:1px solid #d8e0ef;background:#fff;color:var(--text);
      outline:none;transition:.2s;font:inherit
    }
    input:focus,select:focus,textarea:focus{border-color:#60a5fa;box-shadow:0 0 0 4px rgba(96,165,250,.14)}
    textarea{min-height:120px;resize:vertical}
    .mobile-menu{display:none}
    .home-link{white-space:nowrap}
    .section-anchor{scroll-margin-top:90px}
    .top-note{font-size:13px;color:var(--muted)}
    .price-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .price-card strong{font-size:24px;display:block;margin:10px 0 6px}
    .network-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .case-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .case-card .badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:#eef6ff;color:#1d4ed8;font-size:12px;margin-bottom:10px}
    .bullets{margin:12px 0 0;padding:0;list-style:none;display:grid;gap:8px}
    .bullets li{padding-left:16px;position:relative;color:var(--muted)}
    .bullets li:before{content:"";width:6px;height:6px;border-radius:50%;background:#1d4ed8;position:absolute;left:0;top:.65em}
    .compare-stars{font-size:18px;color:#f59e0b;font-weight:800}
    .promo-strip{
      display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
      background:linear-gradient(135deg,#1d4ed8,#4f46e5 50%,#f97316);
      color:#fff;border-radius:24px;padding:18px 20px;margin-top:16px
    }
    .promo-strip p{margin:0;color:rgba(255,255,255,.92)}
    .promo-strip .btn{background:#fff;color:#1d4ed8}
    .scroll-fade{animation:fadeUp .7s ease both}
    .delay-1{animation-delay:.08s}
    .delay-2{animation-delay:.16s}
    .delay-3{animation-delay:.24s}
    @keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
    @media (max-width: 1024px){
      .hero-grid,.grid-3,.grid-2,.stats-row,.review-grid,.articles,.price-grid,.network-grid,.case-grid,.footer-grid{grid-template-columns:1fr 1fr}
      .footer-grid{grid-template-columns:1fr}
      .hero-grid{align-items:start}
    }
    @media (max-width: 760px){
      .container{width:min(var(--container), calc(100% - 24px))}
      .nav-toggle{display:inline-flex}
      .nav-wrap{position:absolute;left:0;right:0;top:100%;background:rgba(247,244,239,.98);border-bottom:1px solid var(--line);display:none}
      .nav-wrap.open{display:block}
      .nav{padding:12px 16px;justify-content:flex-start}
      .header-inner{position:relative}
      .hero-shell{padding:18px;border-radius:24px}
      .hero-grid,.grid-3,.grid-2,.stats-row,.review-grid,.articles,.price-grid,.network-grid,.case-grid,.mini-stat,.form-grid{grid-template-columns:1fr}
      h1{font-size:32px}
      .section-head{flex-direction:column;align-items:flex-start}
      .kefu-panel{display:none}
      .fixed-actions{right:12px;bottom:12px}
      .promo-strip{padding:16px}
    }