:root{
      --bg:#f4f8ff;
      --bg2:#eef4ff;
      --card:#ffffff;
      --line:#dbe6fb;
      --text:#183153;
      --muted:#5a6b84;
      --brand:#1057d8;
      --brand2:#0b79ff;
      --accent:#ffb703;
      --success:#1f9d72;
      --shadow:0 18px 50px rgba(17, 57, 128, .10);
      --shadow2:0 10px 24px rgba(17, 57, 128, .08);
      --radius:20px;
      --radius2:14px;
      --max: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(16,87,216,.14), transparent 26%),
        radial-gradient(circle at top right, rgba(255,183,3,.12), transparent 20%),
        linear-gradient(180deg, var(--bg) 0%, #f8fbff 38%, #f4f8ff 100%);
      line-height:1.7;
      overflow-x:hidden;
    }
    a{color:var(--brand); text-decoration:none}
    img{max-width:100%; display:block}
    .container{
      width:min(var(--max), calc(100% - 32px));
      margin:0 auto;
    }
    .site-header{
      position:sticky;
      top:0;
      z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(244,248,255,.84);
      border-bottom:1px solid rgba(219,230,251,.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;
    }
    .ai-page-logo{
      width:42px;
      height:42px;
      border-radius:12px;
      object-fit:contain;
      background:#fff;
      border:1px solid var(--line);
      box-shadow:var(--shadow2);
      flex:0 0 auto;
    }
    .brand-text{
      display:flex;
      flex-direction:column;
      min-width:0;
    }
    .brand-text strong{
      font-size:18px;
      line-height:1.1;
      letter-spacing:.4px;
    }
    .brand-text span{
      font-size:12px;
      color:var(--muted);
    }
    .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 0;
      opacity:.88;
    }
    .nav-links a:hover,.nav-links a:focus{color:var(--brand)}
    .nav-actions{
      display:flex;
      align-items:center;
      gap:10px;
      flex:0 0 auto;
    }
    .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;
      transition:.25s ease;
      cursor:pointer;
      white-space:nowrap;
    }
    .btn-primary{
      color:#fff;
      background:linear-gradient(135deg, var(--brand) 0%, #2f86ff 100%);
      box-shadow:0 12px 24px rgba(16,87,216,.22);
    }
    .btn-primary:hover{transform:translateY(-2px); box-shadow:0 18px 30px rgba(16,87,216,.26)}
    .btn-ghost{
      color:var(--brand);
      background:#edf4ff;
      border-color:#d3e2ff;
    }
    .btn-ghost:hover{background:#e4efff; transform:translateY(-1px)}
    .menu-toggle{
      display:none;
      width:44px;
      height:44px;
      border-radius:12px;
      border:1px solid var(--line);
      background:#fff;
      align-items:center;
      justify-content:center;
      cursor:pointer;
      box-shadow:var(--shadow2);
    }
    .menu-toggle span{
      width:18px;height:2px;background:var(--text);position:relative;display:block;border-radius:2px;
    }
    .menu-toggle span::before,.menu-toggle span::after{
      content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text);border-radius:2px;
    }
    .menu-toggle span::before{top:-6px}
    .menu-toggle span::after{top:6px}
    .hero{
      padding:40px 0 18px;
    }
    .hero-grid{
      display:grid;
      grid-template-columns:1.12fr .88fr;
      gap:24px;
      align-items:stretch;
    }
    .hero-panel,.card{
      background:linear-gradient(180deg, rgba(255,255,255,.94), #fff);
      border:1px solid rgba(219,230,251,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-panel{
      padding:34px;
      position:relative;
      overflow:hidden;
    }
    .hero-panel::before{
      content:"";
      position:absolute;
      inset:auto -12% -28% auto;
      width:280px;height:280px;border-radius:50%;
      background:radial-gradient(circle, rgba(16,87,216,.14) 0, rgba(16,87,216,.03) 38%, transparent 70%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      color:var(--brand);
      background:#edf4ff;
      border:1px solid #d8e6ff;
      padding:7px 12px;
      border-radius:999px;
      font-size:13px;
      font-weight:700;
    }
    h1{
      margin:16px 0 14px;
      font-size:clamp(30px, 4vw, 52px);
      line-height:1.12;
      letter-spacing:-.02em;
    }
    .lead{
      color:var(--muted);
      margin:0 0 20px;
      font-size:16px;
      max-width:62ch;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-bottom:22px;
    }
    .hero-points{
      display:grid;
      grid-template-columns:repeat(3, minmax(0, 1fr));
      gap:12px;
    }
    .mini-stat{
      background:#f7fbff;
      border:1px solid var(--line);
      border-radius:16px;
      padding:14px;
    }
    .mini-stat strong{
      display:block;
      font-size:20px;
      color:var(--brand);
      margin-bottom:4px;
    }
    .mini-stat span{color:var(--muted); font-size:13px}
    .hero-aside{
      display:grid;
      gap:14px;
    }
    .aside-top{
      padding:24px;
    }
    .aside-top h2{
      margin:0 0 10px;
      font-size:22px;
    }
    .tag-cloud{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:14px;
    }
    .tag{
      display:inline-flex;
      align-items:center;
      padding:8px 12px;
      border-radius:999px;
      background:#f4f8ff;
      color:var(--text);
      border:1px solid #dbe6fb;
      font-size:13px;
    }
    .support-card{
      padding:22px 24px;
    }
    .support-row{
      display:flex;
      gap:14px;
      align-items:flex-start;
      margin-top:14px;
    }
    .support-badge{
      width:42px;height:42px;border-radius:12px;
      background:linear-gradient(135deg, #dff0ff, #eef4ff);
      border:1px solid var(--line);
      display:grid;place-items:center;
      color:var(--brand);
      font-weight:900;
      flex:0 0 auto;
    }
    .section{
      padding:22px 0 6px;
    }
    .section-head{
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:18px;
      margin-bottom:16px;
    }
    .section-head h2{
      margin:0;
      font-size:28px;
      line-height:1.2;
    }
    .section-head p{
      margin:0;
      color:var(--muted);
      max-width:60ch;
    }
    .grid-4{
      display:grid;
      grid-template-columns:repeat(4, minmax(0, 1fr));
      gap:16px;
    }
    .card{
      padding:22px;
    }
    .metric{
      font-size:30px;
      font-weight:900;
      color:var(--brand);
      margin-bottom:8px;
      letter-spacing:-.03em;
    }
    .card h3,.card h4{margin:0 0 8px}
    .card p{margin:0;color:var(--muted)}
    .feature-grid{
      display:grid;
      grid-template-columns:repeat(3, minmax(0, 1fr));
      gap:16px;
    }
    .feature{
      position:relative;
      overflow:hidden;
    }
    .feature::after{
      content:"";
      position:absolute;
      right:-40px; top:-40px;
      width:120px;height:120px;border-radius:50%;
      background:radial-gradient(circle, rgba(16,87,216,.08), transparent 68%);
    }
    .feature ul{
      padding-left:18px;
      margin:12px 0 0;
      color:var(--muted);
    }
    .two-col{
      display:grid;
      grid-template-columns:1.02fr .98fr;
      gap:16px;
      align-items:start;
    }
    .workflow{
      display:grid;
      gap:12px;
      margin-top:14px;
    }
    .step{
      display:flex;
      gap:14px;
      padding:14px 0;
      border-top:1px dashed #dbe6fb;
    }
    .step:first-child{border-top:none;padding-top:0}
    .step-num{
      width:38px;height:38px;border-radius:50%;
      display:grid;place-items:center;
      background:linear-gradient(135deg, #0b79ff, #1057d8);
      color:#fff;
      font-weight:800;
      flex:0 0 auto;
      box-shadow:0 10px 18px rgba(16,87,216,.18);
    }
    .compare-wrap{
      overflow:auto;
      border-radius:18px;
      border:1px solid var(--line);
      background:#fff;
    }
    table{
      width:100%;
      border-collapse:collapse;
      min-width:720px;
      background:#fff;
    }
    th,td{
      padding:16px 14px;
      border-bottom:1px solid #edf2fb;
      text-align:left;
      vertical-align:top;
    }
    th{
      background:#f7fbff;
      color:var(--text);
      font-size:14px;
    }
    td{color:var(--muted)}
    .rating{
      display:inline-flex;
      align-items:center;
      gap:6px;
      color:#ff8c00;
      font-weight:800;
    }
    .badge{
      display:inline-flex;
      align-items:center;
      padding:5px 10px;
      border-radius:999px;
      background:#eef4ff;
      color:var(--brand);
      border:1px solid #d8e6ff;
      font-size:12px;
      font-weight:700;
      margin-bottom:10px;
    }
    .case-grid,.review-grid,.article-grid{
      display:grid;
      grid-template-columns:repeat(3, minmax(0, 1fr));
      gap:16px;
    }
    .case img{
      width:100%;
      border-radius:16px;
      border:1px solid var(--line);
      margin-top:12px;
      background:#fff;
    }
    .review .quote{
      font-size:15px;
      color:var(--text);
      margin-bottom:14px;
    }
    .review .name{
      display:flex;
      justify-content:space-between;
      gap:12px;
      color:var(--muted);
      font-size:13px;
      border-top:1px solid #edf2fb;
      padding-top:12px;
    }
    .faq{
      display:grid;
      gap:12px;
    }
    details{
      background:#fff;
      border:1px solid var(--line);
      border-radius:16px;
      box-shadow:var(--shadow2);
      overflow:hidden;
    }
    summary{
      list-style:none;
      cursor:pointer;
      padding:18px 18px;
      font-weight:700;
      color:var(--text);
      position:relative;
    }
    summary::-webkit-details-marker{display:none}
    summary::after{
      content:"+";
      position:absolute;
      right:18px;
      top:50%;
      transform:translateY(-50%);
      color:var(--brand);
      font-size:22px;
      font-weight:500;
    }
    details[open] summary::after{content:"−"}
    details .ans{
      padding:0 18px 18px;
      color:var(--muted);
    }
    .form-grid{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:14px;
    }
    .field{
      display:flex;
      flex-direction:column;
      gap:8px;
    }
    label{font-weight:700;font-size:14px}
    input,select,textarea{
      width:100%;
      border:1px solid #d9e4f7;
      background:#fff;
      border-radius:14px;
      padding:13px 14px;
      color:var(--text);
      font:inherit;
      outline:none;
      transition:.2s ease;
    }
    input:focus,select:focus,textarea:focus{
      border-color:#8db6ff;
      box-shadow:0 0 0 4px rgba(16,87,216,.08);
    }
    textarea{min-height:120px; resize:vertical}
    .span-2{grid-column:span 2}
    .form-note{
      font-size:13px;
      color:var(--muted);
      margin-top:10px;
    }
    .links-grid{
      display:grid;
      grid-template-columns:repeat(2, minmax(0, 1fr));
      gap:12px 18px;
    }
    .links-grid a{
      padding:12px 0;
      border-bottom:1px solid #edf2fb;
      color:var(--text);
    }
    .links-grid a:hover{color:var(--brand)}
    .footer{
      margin-top:18px;
      padding:26px 0 34px;
      border-top:1px solid #dbe6fb;
      color:#28405f;
      background:linear-gradient(180deg, rgba(255,255,255,.34), rgba(255,255,255,.68));
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.1fr .9fr .9fr;
      gap:18px;
      align-items:start;
    }
    .footer h3,.footer h4{margin-top:0;color:var(--text)}
    .footer a{color:var(--brand)}
    .copyright{
      margin-top:18px;
      padding-top:16px;
      border-top:1px solid #dbe6fb;
      color:#5c6d86;
      font-size:13px;
    }
    .float-tools{
      position:fixed;
      right:16px;
      bottom:16px;
      z-index:60;
      display:grid;
      gap:10px;
    }
    .float-btn{
      width:48px;
      height:48px;
      border-radius:14px;
      border:1px solid #d5e2fb;
      background:#fff;
      box-shadow:var(--shadow2);
      display:grid;
      place-items:center;
      color:var(--brand);
      font-weight:900;
      cursor:pointer;
    }
    .kefu{
      position:fixed;
      left:16px;
      bottom:16px;
      z-index:60;
      width:min(260px, calc(100vw - 32px));
      background:#fff;
      border:1px solid #dbe6fb;
      box-shadow:var(--shadow);
      border-radius:18px;
      overflow:hidden;
    }
    .kefu-toggle{
      width:100%;
      border:0;
      background:linear-gradient(135deg, #0b79ff, #1057d8);
      color:#fff;
      padding:12px 14px;
      font-weight:800;
      text-align:left;
      cursor:pointer;
    }
    .kefu-body{
      display:none;
      padding:14px;
    }
    .kefu.open .kefu-body{display:block}
    .kefu-body img{
      width:100%;
      border-radius:14px;
      border:1px solid var(--line);
      margin-bottom:10px;
    }
    .mobile-only{display:none}
    .reveal{opacity:0; transform:translateY(18px); transition:.6s ease}
    .reveal.show{opacity:1; transform:translateY(0)}
    @media (max-width: 1100px){
      .hero-grid,.two-col,.footer-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.grid-4{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 820px){
      .nav-links,.nav-actions{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-only{display:flex}
      .nav-panel{
        display:none;
        padding:0 0 16px;
      }
      .nav-panel.open{display:block}
      .nav-panel .nav-links{
        display:grid;
        grid-template-columns:1fr 1fr;
        gap:0 14px;
        padding:10px 0 14px;
      }
      .nav-panel .nav-actions{
        display:flex;
        padding-bottom:10px;
      }
      .hero,.section{padding-top:18px}
      .hero-grid,.two-col,.footer-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.grid-4,.form-grid{grid-template-columns:1fr}
      .hero-panel{padding:24px}
      .hero-points{grid-template-columns:1fr}
      .section-head{flex-direction:column; align-items:flex-start}
      .span-2{grid-column:span 1}
      .links-grid{grid-template-columns:1fr}
      .kefu{left:12px; right:12px; width:auto}
      .float-tools{right:12px; bottom:12px}
    }