/* 全屏重复水印 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9999;

  pointer-events: none;
  user-select: none;

  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='420' height='220'%3E%3Ctext x='35' y='155' transform='rotate(-25 35 155)' fill='%23333333' fill-opacity='0.75' font-size='16' font-family='Arial%2C sans-serif'%3E%3Ctspan x='35' dy='0'%3E%C2%A9%20tom6m6.github.io/DaSE.Courses%3C/tspan%3E%3Ctspan x='35' dy='24'%3E%E6%B0%B8%E4%B9%85%E5%85%8D%E8%B4%B9%E5%88%86%E4%BA%AB%EF%BC%8C%E7%A6%81%E6%AD%A2%E7%94%A8%E4%BA%8E%E5%95%86%E4%B8%9A%E7%94%A8%E9%80%94%3C/tspan%3E%3C/text%3E%3C/svg%3E");

  background-repeat: repeat;
  background-size: 420px 220px;
  opacity: 0.32;
}

/* Material for MkDocs 深色模式 */
[data-md-color-scheme="slate"] body::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='420' height='220'%3E%3Ctext x='35' y='155' transform='rotate(-25 35 155)' fill='%23ffffff' fill-opacity='0.75' font-size='16' font-family='Arial%2C sans-serif'%3E%3Ctspan x='35' dy='0'%3E%C2%A9%20tom6m6.github.io/DaSE.Courses%3C/tspan%3E%3Ctspan x='35' dy='24'%3E%E6%B0%B8%E4%B9%85%E5%85%8D%E8%B4%B9%E5%88%86%E4%BA%AB%EF%BC%8C%E7%A6%81%E6%AD%A2%E7%94%A8%E4%BA%8E%E5%95%86%E4%B8%9A%E7%94%A8%E9%80%94%3C/tspan%3E%3C/text%3E%3C/svg%3E");

  opacity: 0.28;
}