html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
}

#stage {
  position: fixed;
  inset: 0;
  background: #000;
}

.layer {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.8s ease;
  background: #000;
}

.layer.visible {
  opacity: 1;
  z-index: 2;
}

.layer img,
.layer video {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.empty-message {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #555;
  font-family: sans-serif;
  font-size: 24px;
  z-index: 3;
}