/* 可逆水印：删除本 CSS 引用即可关闭。只绘制文字，不改变页面背景色。 */
body::after{
  content:"" !important;
  position:fixed !important;
  left:0 !important;
  top:0 !important;
  right:0 !important;
  bottom:0 !important;
  width:100vw !important;
  height:100vh !important;
  pointer-events:none !important;
  z-index:2147483647 !important;
  background-color:transparent !important;
  background-image:url("data:image/svg+xml,%3Csvg xmlns=%27http://www.w3.org/2000/svg%27 width=%27320%27 height=%27220%27 viewBox=%270 0 320 220%27%3E%3Cg transform=%27translate(32 145) rotate(-28)%27%3E%3Ctext x=%270%27 y=%270%27 font-family=%27Arial, Microsoft YaHei, sans-serif%27 font-size=%2738%27 font-weight=%27400%27 fill=%27%23212121%27 fill-opacity=%270.16%27%3E%E6%B5%8B%E8%AF%95%E7%89%88%E6%9C%AC%3C/text%3E%3C/g%3E%3C/svg%3E") !important;
  background-repeat:repeat !important;
  background-size:320px 220px !important;
  background-position:0 0 !important;
  opacity:1 !important;
}
@media print{body::after{display:none !important;}}