:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f3f7ff;
      --text:#172033;
      --muted:#5e6a82;
      --line:#dce4f2;
      --brand:#2563eb;
      --brand-2:#7c3aed;
      --accent:#0ea5e9;
      --warm:#ff7a59;
      --shadow:0 14px 40px rgba(32,54,108,.12);
      --shadow-soft:0 8px 24px rgba(32,54,108,.08);
      --radius:20px;
      --radius-sm:14px;
      --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",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at 12% 12%, rgba(37,99,235,.10), transparent 26%),
        radial-gradient(circle at 88% 10%, rgba(124,58,237,.12), transparent 22%),
        linear-gradient(180deg,#f8fbff 0%, #f6f8fc 40%, #f7f8fc 100%);
    }
    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(14px);
      background:rgba(247,248,252,.82);
      border-bottom:1px solid rgba(220,228,242,.8);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:16px;
      min-height:78px;
    }
    .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(--shadow-soft)}
    .brand-text{display:flex;flex-direction:column;line-height:1.1}
    .brand-text strong{font-size:18px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#31415f;padding:8px 0;position:relative;white-space:nowrap}
    .nav-links a::after{
      content:"";position:absolute;left:0;bottom:2px;width:100%;height:2px;border-radius:999px;
      background:linear-gradient(90deg,var(--brand),var(--brand-2));transform:scaleX(0);transform-origin:left;transition:.25s;
    }
    .nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1)}
    .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:12px 18px;
      font-weight:700;cursor:pointer;transition:.25s ease;line-height:1;
      white-space:nowrap;
    }
    .btn-primary{
      color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));
      box-shadow:0 12px 24px rgba(37,99,235,.22);
    }
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(37,99,235,.28)}
    .btn-ghost{color:var(--text);background:#fff;border-color:var(--line)}
    .btn-ghost:hover{transform:translateY(-2px);box-shadow:var(--shadow-soft)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;width:44px;height:44px;align-items:center;justify-content:center;cursor:pointer}
    .menu-toggle span{display:block;width:18px;height:2px;background:#334155;position:relative;border-radius:999px}
    .menu-toggle span::before,.menu-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:#334155;border-radius:999px}
    .menu-toggle span::before{top:-6px}.menu-toggle span::after{top:6px}

    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch;
    }
    .hero-main,.hero-side,.card,.section-card{
      background:rgba(255,255,255,.86);
      border:1px solid rgba(220,228,242,.92);
      border-radius:var(--radius);
      box-shadow:var(--shadow-soft);
    }
    .hero-main{padding:34px;position:relative;overflow:hidden}
    .hero-main::before,.hero-main::after{
      content:"";position:absolute;border-radius:999px;filter:blur(4px);pointer-events:none
    }
    .hero-main::before{width:220px;height:220px;background:rgba(37,99,235,.10);right:-70px;top:-80px}
    .hero-main::after{width:180px;height:180px;background:rgba(124,58,237,.10);left:-60px;bottom:-80px}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;background:linear-gradient(90deg,rgba(37,99,235,.1),rgba(124,58,237,.1));
      color:#2140a0;font-size:13px;font-weight:700;
    }
    h1{margin:16px 0 14px;font-size:clamp(32px,4vw,54px);line-height:1.06;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-points{
      display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px
    }
    .point{
      padding:14px 14px;border-radius:16px;background:#f8fbff;border:1px solid #e4ebf8
    }
    .point strong{display:block;font-size:20px;color:#14213d}
    .point span{display:block;margin-top:4px;font-size:13px;color:var(--muted)}
    .hero-side{padding:22px;display:flex;flex-direction:column;gap:14px}
    .mini-stat{
      padding:18px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#eef5ff);border:1px solid #dbe6fb
    }
    .mini-stat h3{margin:0 0 8px;font-size:15px}
    .mini-stat .value{font-size:30px;font-weight:800;color:#1638a3}
    .mini-stat p{margin:8px 0 0;color:var(--muted);font-size:13px;line-height:1.7}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid #dbe3f1;color:#335; font-size:13px}
    .section{padding:14px 0 8px}
    .section-head{display:flex;justify-content:space-between;gap:16px;align-items:end;margin:24px 0 14px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{padding:22px}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .card ul{margin:0;padding-left:18px}
    .metric{display:flex;flex-direction:column;gap:10px}
    .metric .num{font-size:30px;font-weight:800;color:#1536a0}
    .service-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .service-item{
      padding:16px;border-radius:16px;background:linear-gradient(180deg,#ffffff,#f6f9ff);
      border:1px solid #e2e9f8;transition:.25s ease;
    }
    .service-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-soft)}
    .service-item strong{display:block;margin-bottom:6px}
    .process{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:18px;background:#fff;border:1px solid #dfe7f5;position:relative}
    .step .index{display:inline-flex;width:34px;height:34px;border-radius:12px;align-items:center;justify-content:center;background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(124,58,237,.12));color:#2140a0;font-weight:800;margin-bottom:12px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid #dbe3f1;background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid #e8eef8;text-align:left;vertical-align:top}
    th{background:#f5f8ff;color:#24344f;font-size:14px}
    td{color:#334155;font-size:14px;line-height:1.7}
    .badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(14,165,233,.12);color:#0b5f8a;font-size:12px;font-weight:700}
    .review{display:flex;flex-direction:column;gap:12px}
    .stars{color:#f59e0b;font-size:18px;letter-spacing:2px}
    .quote{font-size:15px;line-height:1.8;color:#3c4a63}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .article-list{display:grid;gap:12px}
    .article{
      display:flex;justify-content:space-between;gap:16px;align-items:center;
      padding:16px 18px;border-radius:16px;background:#fff;border:1px solid #e1e8f4;
      transition:.25s ease;
    }
    .article:hover{transform:translateY(-2px);box-shadow:var(--shadow-soft)}
    .article span{color:var(--muted);font-size:13px;white-space:nowrap}
    .faq-item{
      border:1px solid #dfe7f5;border-radius:16px;background:#fff;overflow:hidden
    }
    .faq-q{
      width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;
      background:#fff;border:0;padding:16px 18px;font-size:15px;font-weight:700;color:#20304f;cursor:pointer;text-align:left
    }
    .faq-q::after{content:"+";font-size:22px;color:#3b5cc4}
    .faq-item.open .faq-q::after{content:"–"}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;background:#f8fbff}
    .faq-a p{margin:0;padding:0 18px 16px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{max-height:220px}
    .form{
      display:grid;grid-template-columns:repeat(2,1fr);gap:14px
    }
    .field{display:flex;flex-direction:column;gap:8px}
    .field.full{grid-column:1/-1}
    label{font-size:14px;font-weight:700;color:#24344f}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid #d8e2f2;background:#fff;
      color:var(--text);font:inherit;outline:none;transition:.2s
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(37,99,235,.7);box-shadow:0 0 0 4px rgba(37,99,235,.10)}
    textarea{min-height:120px;resize:vertical}
    .footer{
      margin-top:18px;padding:22px 0 28px;border-top:1px solid #dce4f2;background:#f6f8fc;color:#22304d
    }
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
    .footer a{color:#2140a0}
    .float-actions{
      position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px
    }
    .float-actions a,.float-actions button{
      width:48px;height:48px;border-radius:16px;border:1px solid #d8e2f2;background:#fff;box-shadow:var(--shadow-soft);
      display:flex;align-items:center;justify-content:center;cursor:pointer;color:#234;padding:0
    }
    .reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .reveal.in{opacity:1;transform:translateY(0)}
    .mobile-panel{display:none}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.split,.footer-grid,.process{grid-template-columns:1fr}
      .service-list,.form{grid-template-columns:1fr}
      .section-head{align-items:flex-start;flex-direction:column}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-panel{
        display:none; padding:0 0 16px;
      }
      .mobile-panel.open{display:block}
      .mobile-panel .panel{
        background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:var(--shadow-soft)
      }
      .mobile-panel a{display:block;padding:10px 6px;color:#30405e;border-bottom:1px solid #edf2fa}
      .mobile-panel a:last-child{border-bottom:0}
    }
    @media (max-width: 640px){
      .container{width:min(var(--container), calc(100% - 24px))}
      .hero-main{padding:24px}
      .hero-points{grid-template-columns:1fr}
      .nav{min-height:70px}
      .brand-text span{display:none}
      h1{font-size:30px}
      .btn{padding:11px 14px}
    }