/* One permanently sized surface. No control layout, popup, or scroll area. */
:root { color-scheme: dark; }
html, body { margin:0; padding:0; width:100%; height:100%; overflow:hidden; background:#000; }
#stage { position:fixed; inset:0; overflow:hidden; background:#000; user-select:none; -webkit-user-select:none; }
#stage > iframe, #stage > video { display:block; position:absolute; border:0; padding:0; margin:0; background:#000; outline:0; }
#stage > iframe { pointer-events:none; }
#stage > video { inset:0; width:100%; height:100%; object-fit:cover; pointer-events:none; }