.scene-glass { position:fixed; inset:0; width:100%; height:100%; z-index:40; pointer-events:none; visibility:hidden; }
.scene-glass.is-running { visibility:visible; }
.chapter-in-flight [data-section].is-transitioning { will-change:clip-path; }
/* Section size, overflow and content transforms remain untouched. */
@media(prefers-reduced-motion:reduce) { .scene-glass { display:none!important; } }