:root {
  color-scheme: dark;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: #000;
  overflow: hidden;
}

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

.bg-video,
.poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
}

.poster {
  opacity: 1;
  transition: opacity 420ms ease;
  z-index: 2;
}

body.video-ready .poster {
  opacity: 0;
  pointer-events: none;
}

.sound-button {
  position: absolute;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  z-index: 3;

  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(0, 0, 0, 0.55);
  color: rgba(255, 255, 255, 0.92);
  padding: 12px 16px;
  border-radius: 999px;
  font: 14px/1.1 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    sans-serif;
  letter-spacing: 0.2px;

  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.sound-button:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.85);
  outline-offset: 2px;
}

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