/* cg-fab · 一键返回产品矩阵主页悬浮按钮（XT-FAB 20260919A）
   全站共享：任意子站 <link href="/cg-fab.css"> + <a class="cg-fab" href="/portal/">
   纯 CSS 零 JS · 零内联 · CSP style-src 'self' 合规 */
.cg-fab {
  position: fixed; right: 14px; bottom: 18px; z-index: 99999;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 15px; border-radius: 999px;
  background: linear-gradient(135deg, #2a6ff3, #5ac8fa);
  color: #fff; font-size: 13px; font-weight: 700;
  text-decoration: none; letter-spacing: 1px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  opacity: 0.92; transition: opacity 0.15s;
}
.cg-fab:hover, .cg-fab:active { opacity: 1; color: #fff; }
.cg-fab:visited { color: #fff; }
@media (max-width: 640px) {
  .cg-fab { right: 10px; bottom: 14px; padding: 9px 12px; font-size: 12px; }
}
@media print { .cg-fab { display: none; } }