/* The three.js blueprint's canvas, and the curtain held until its first frame is drawn (start.js adds .bp-ready then,
   or when it cannot run, lifting the curtain onto black). */
#bp { position: fixed; inset: 0; width: 100%; height: 100%; display: block; }
#curtain { animation-play-state: paused; }
.bp-ready #curtain { animation-play-state: running; }