#bg-plum-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
  /* 中间透明、边缘显形的径向遮罩，避免脉络遮挡首页正文 */
  -webkit-mask-image: radial-gradient(circle, transparent, black);
  mask-image: radial-gradient(circle, transparent, black);
}

#bg-plum-overlay bg-plum,
#bg-plum-overlay canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* 把主内容区和页脚提到 overlay 上方，同时保持背景透明让特效可见 */
.VPContent,
.site-footer,
.VPFooter {
  position: relative;
  z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
  #bg-plum-overlay {
    display: none !important;
  }
}