/* One decorative layer, below the existing page; no content geometry changes. */
body:has(> .bifurcation-background){isolation:isolate}
.bifurcation-background{
 position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none;
 contain:strict;opacity:.58;
 /* One translucent layer: no text cutouts, masks, or scroll-time style work. */
}
.bifurcation-background canvas{display:block;width:100%;height:100%}
:root[data-theme=light] .bifurcation-background{opacity:.50}
@media(max-width:760px){
 .bifurcation-background{opacity:.68}
 :root[data-theme=light] .bifurcation-background{opacity:.60}
}
:root.model-panel-open .bifurcation-background{opacity:.16}
@media print, (forced-colors:active){.bifurcation-background{display:none}}