.world-webgl {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  display: block;
  opacity: 0;
  transition: opacity 520ms ease;
  outline: none;
}

.world-home.webgl-ready .world-webgl {
  opacity: 1;
}

/* Once the real-time renderer is alive, the reference plate becomes fallback only. */
.world-home.webgl-ready .world-image {
  opacity: 0 !important;
  visibility: hidden;
}

.world-home.webgl-ready .world-depth {
  display: none;
}

.world-home.webgl-ready .world-effects {
  z-index: 3;
  opacity: .18;
}

.world-home.webgl-failed .world-webgl {
  display: none;
}

.world-home.webgl-failed .world-image {
  visibility: visible;
}

.world-home.webgl-failed .world-load-failed {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .world-webgl { transition: none; }
}