/* nBUN Falling BG — container-injected canvas (transparent) */
.nbun-fbg-wrap{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  pointer-events:none;
  z-index: var(--nbun-fbg-z, 0);
}
.nbun-fbg-canvas{ width:100%; height:100%; display:block; }
.nbun-fbg-debug{
  position:absolute; left:10px; bottom:10px;
  font: 12px/1.2 -apple-system,BlinkMacSystemFont,Inter,'Noto Sans TC',Arial,sans-serif;
  padding:6px 10px; border-radius:999px;
  background:rgba(0,0,0,.55); color:#fff;
  z-index:999999; pointer-events:none;
}