/* ========== 虹ロードオーバーレイ ========== */
#intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 99999;
  background: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  pointer-events: all;
  opacity: 1;
  transition: opacity 0.45s ease 0.05s;
}

#intro-overlay.hidden {
  pointer-events: none;
  opacity: 0;
}

#intro-overlay.done {
  display: none;
}

/* 描画キャンバス */
#intro-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}