.af-wm {
  position: fixed;
  inset: 0;
  z-index: 9998;
  pointer-events: none;
  user-select: none;
  background-repeat: repeat;
  background-size: 460px 300px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='460' height='300'><text x='230' y='160' text-anchor='middle' fill='rgba(16,32,51,0.11)' font-size='16' font-weight='600' font-family='Microsoft YaHei, Noto Sans SC, sans-serif' transform='rotate(-24 230 160)'>算数科技  演示使用   18016313342 微信同号</text></svg>");
}
body:has(#app.is-login) .af-wm,
body.af-wm-dark .af-wm {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='460' height='300'><text x='230' y='160' text-anchor='middle' fill='rgba(255,255,255,0.12)' font-size='16' font-weight='600' font-family='Microsoft YaHei, Noto Sans SC, sans-serif' transform='rotate(-24 230 160)'>算数科技  演示使用   18016313342 微信同号</text></svg>");
}
@media print {
  .af-wm { position: fixed; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}