/* Dark stage for the audio-reactive visual. */
html,
body {
  margin: 0;
  height: 100%;
  background: #06070e;
  overflow: hidden;
}

#stage {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

/* Click-to-start overlay — required by browser autoplay policy. */
#start {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.5rem;
  font-family: system-ui, sans-serif;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  color: #e9ebff;
  background: rgba(20, 22, 40, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: background 0.2s ease, transform 0.2s ease;
}

#start:hover {
  background: rgba(40, 44, 78, 0.85);
  transform: translate(-50%, -50%) scale(1.04);
}

#start .ico {
  font-size: 0.7rem;
  opacity: 0.85;
}

#start.hidden {
  display: none;
}