:root{
      --bg:#f4f7fb;
      --card:#ffffff;
      --card2:#f8fbff;
      --line:#d8e3f0;
      --text:#17304d;
      --muted:#5f738a;
      --brand:#165dff;
      --brand2:#0f3ea8;
      --accent:#3dd3ff;
      --warm:#eaf2ff;
      --shadow:0 18px 40px rgba(19, 60, 126, .10);
      --radius:22px;
      --radius-sm:16px;
      --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(22,93,255,.10), transparent 26%),
        radial-gradient(circle at 85% 12%, rgba(61,211,255,.12), transparent 22%),
        linear-gradient(180deg,#f8fbff 0%,#f3f7fc 48%,#eff4fb 100%);
    }
    a{color:var(--brand);text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .topbar{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(248,251,255,.85);
      border-bottom:1px solid rgba(216,227,240,.9);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:18px;
      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:10px}
    .brand .name{display:flex;flex-direction:column;line-height:1.1}
    .brand strong{font-size:18px;letter-spacing:.5px}
    .brand span{font-size:12px;color:var(--muted)}
    .menu-btn{
      display:none;border:1px solid var(--line);background:#fff;color:var(--text);
      border-radius:12px;padding:10px 12px;font-size:14px;cursor:pointer;
      box-shadow:0 8px 18px rgba(16,48,96,.06);
    }
    .nav-links{
      display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end;
    }
    .nav-links a{
      color:var(--text);font-size:14px;padding:8px 10px;border-radius:999px;
    }
    .nav-links a:hover{background:#eaf2ff;color:var(--brand2)}
    .nav-cta{
      display:flex;align-items:center;gap:10px;flex-wrap:wrap;
    }
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:1px solid transparent;border-radius:14px;padding:12px 18px;
      font-weight:600;cursor:pointer;transition:.25s ease;
      box-shadow:0 12px 24px rgba(22,93,255,.12);
      white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4c8bff);color:#fff}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(22,93,255,.20)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text);box-shadow:none}
    .btn-ghost:hover{border-color:#b8c9e0;transform:translateY(-2px)}
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch;
    }
    .hero-main,.hero-side,.panel,.card,.faq-item,.testimonial,.article,.timeline-item,.price-box,.form-box,.compare-box,.help-box{
      background:linear-gradient(180deg,rgba(255,255,255,.96),rgba(248,251,255,.95));
      border:1px solid rgba(216,227,240,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-main{padding:34px}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;background:#eaf2ff;color:var(--brand2);
      font-size:13px;font-weight:700;
    }
    h1{
      margin:16px 0 14px;
      font-size:clamp(30px,4.3vw,54px);
      line-height:1.08;
      letter-spacing:-.02em;
    }
    .lead{color:var(--muted);font-size:16px;line-height:1.9;max-width:62ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0 20px}
    .hero-points{
      display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:22px
    }
    .mini{
      padding:14px 14px 13px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#eef5ff);
      border:1px solid #d9e5f4
    }
    .mini strong{display:block;font-size:20px;color:var(--brand2)}
    .mini span{font-size:13px;color:var(--muted)}
    .hero-side{padding:24px;background:linear-gradient(180deg,#0e2f7a,#1448b0 70%,#165dff);color:#fff;position:relative;overflow:hidden}
    .hero-side:before,.hero-side:after{
      content:"";position:absolute;border-radius:50%;background:rgba(61,211,255,.14);filter:blur(2px)
    }
    .hero-side:before{width:180px;height:180px;right:-55px;top:-35px}
    .hero-side:after{width:140px;height:140px;left:-30px;bottom:10px}
    .hero-side h2,.hero-side p,.hero-side li{color:#fff}
    .hero-side h2{margin:0 0 12px;font-size:22px}
    .stack{
      display:grid;gap:12px;position:relative;z-index:1
    }
    .stack .stat{
      padding:16px;border-radius:18px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.18)
    }
    .stat b{display:block;font-size:26px;line-height:1.1}
    .stat span{display:block;font-size:13px;opacity:.9;margin-top:4px}
    section{padding:18px 0}
    .section-head{
      display:flex;align-items:flex-end;justify-content:space-between;gap:14px;margin-bottom:16px
    }
    .section-head h2{margin:0;font-size:clamp(22px,2.8vw,34px);line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.8}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .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}
    .card{padding:20px}
    .card h3{margin:12px 0 8px;font-size:18px}
    .card p{margin:0;color:var(--muted);line-height:1.8}
    .icon{
      width:42px;height:42px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,#eaf2ff,#dbe9ff);color:var(--brand2);font-weight:800
    }
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#f2f7ff;border:1px solid #d8e3f0;color:#24415f;font-size:13px}
    .panel{padding:22px}
    .workflow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{
      padding:18px;border-radius:18px;background:linear-gradient(180deg,#ffffff,#f7fbff);
      border:1px solid #d8e3f0;position:relative
    }
    .step .num{
      display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:12px;
      background:#eaf2ff;color:var(--brand2);font-weight:800;margin-bottom:10px
    }
    .step h3{margin:0 0 8px;font-size:17px}
    .step p{margin:0;color:var(--muted);line-height:1.8}
    .scroll-x{overflow-x:auto;-webkit-overflow-scrolling:touch}
    table{width:100%;border-collapse:collapse;min-width:760px;background:#fff;border-radius:18px;overflow:hidden}
    th,td{padding:14px 12px;border-bottom:1px solid #e3ebf5;text-align:left;vertical-align:top}
    th{background:#edf4ff;color:var(--brand2);font-size:14px}
    td{color:var(--text);font-size:14px;line-height:1.7}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#eaf2ff;color:var(--brand2);font-size:12px;font-weight:700}
    .price-list,.timeline,.faq-list,.review-list,.article-list{display:grid;gap:14px}
    .price-box,.help-box,.compare-box,.form-box{padding:22px}
    .price-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:16px}
    .price-item{
      padding:18px;border-radius:18px;background:#f8fbff;border:1px solid #dbe5f1
    }
    .price-item strong{display:block;font-size:20px;color:var(--brand2)}
    .price-item p{margin:8px 0 0;color:var(--muted);line-height:1.7}
    .faq-item{
      overflow:hidden
    }
    .faq-q{
      width:100%;padding:18px 20px;background:transparent;border:0;color:var(--text);text-align:left;
      display:flex;align-items:center;justify-content:space-between;gap:14px;font-size:16px;font-weight:700;cursor:pointer
    }
    .faq-a{padding:0 20px 18px;color:var(--muted);line-height:1.85;display:none}
    .faq-item.open .faq-a{display:block}
    .faq-item.open .chev{transform:rotate(180deg)}
    .chev{transition:.25s ease}
    .testimonial{
      padding:18px
    }
    .testimonial .top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
    .stars{color:#f5a623;letter-spacing:1px}
    .testimonial p{margin:10px 0 12px;color:var(--text);line-height:1.85}
    .testimonial .role{color:var(--muted);font-size:13px}
    .article{
      padding:18px
    }
    .article small{color:var(--brand2);font-weight:700}
    .article h3{margin:8px 0 8px;font-size:17px}
    .article p{margin:0;color:var(--muted);line-height:1.8}
    .timeline-item{padding:18px}
    .timeline-item h3{margin:0 0 8px;font-size:17px}
    .timeline-item p{margin:0;color:var(--muted);line-height:1.8}
    .contact-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}
    .form{
      display:grid;gap:12px
    }
    .field{
      display:grid;gap:8px
    }
    label{font-size:14px;font-weight:700;color:var(--text)}
    input,select,textarea{
      width:100%;border:1px solid #d8e3f0;background:#fff;color:var(--text);
      border-radius:14px;padding:12px 14px;font:inherit;outline:none;transition:.2s ease
    }
    input:focus,select:focus,textarea:focus{border-color:#7fb0ff;box-shadow:0 0 0 4px rgba(22,93,255,.10)}
    textarea{min-height:124px;resize:vertical}
    .side-qrcode{
      display:grid;gap:14px
    }
    .qrcode{
      display:flex;align-items:center;gap:14px;padding:16px;background:#f8fbff;border:1px solid #dbe5f1;border-radius:18px
    }
    .qrcode img{width:112px;height:112px;object-fit:cover;border-radius:14px;border:1px solid #d8e3f0;background:#fff}
    .footer{
      margin-top:18px;padding:24px 0 30px;border-top:1px solid rgba(216,227,240,.95);background:#eef4fb;color:var(--text)
    }
    .footer a{color:#174dcb}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr 1fr;gap:18px;align-items:start}
    .footer small,.footer p{color:#4f6780;line-height:1.8}
    .footer .links{display:flex;flex-wrap:wrap;gap:10px}
    .footer .links a{padding:8px 10px;border-radius:999px;background:#fff;border:1px solid #d8e3f0}
    .bottom{margin-top:18px;padding-top:14px;border-top:1px solid #d8e3f0;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
    .float-bar{
      position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px
    }
    .float-bar a,.float-bar button{
      border:0;cursor:pointer;width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),#4c8bff);color:#fff;box-shadow:0 16px 32px rgba(22,93,255,.25)
    }
    .float-bar a:hover,.float-bar button:hover{transform:translateY(-2px)}
    .reveal{opacity:0;transform:translateY(16px);transition:.65s ease}
    .reveal.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 1024px){
      .hero-grid,.contact-layout,.footer-grid,.grid-4,.workflow,.price-grid,.grid-3,.grid-2{grid-template-columns:1fr 1fr}
      .hero-points{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .nav.open .nav-links{
        display:flex;position:absolute;left:16px;right:16px;top:76px;flex-direction:column;align-items:flex-start;
        background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)
      }
      .nav.open .nav-cta{display:none}
      .nav{position:relative}
    }
    @media (max-width: 720px){
      .hero-main,.hero-side,.panel,.card,.faq-item,.testimonial,.article,.timeline-item,.price-box,.form-box,.compare-box,.help-box{border-radius:18px}
      .hero-grid,.contact-layout,.footer-grid,.grid-4,.workflow,.price-grid,.grid-3,.grid-2{grid-template-columns:1fr}
      .hero-main{padding:24px}
      .hero-side{padding:22px}
      .section-head{flex-direction:column;align-items:flex-start}
      .menu-btn{display:inline-flex}
      .brand .name span{display:none}
      .hero-actions .btn{width:100%}
      .mobile-only{display:block}
      .desktop-only{display:none}
      table{min-width:980px}
    }