.display-mode-toast {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translate(-50%, -140%) scale(0.96);
  padding: 10px 22px;
  border-radius: 999px;
  background: rgba(19, 28, 48, 0.92);
  color: #ffffff;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.8px;
  box-shadow: 0 16px 40px rgba(7, 10, 24, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.35s ease, opacity 0.35s ease;
  z-index: 1400;
}

.display-mode-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
}

.workspace {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  overflow: hidden;
}

.canvas-wrapper {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.canvas-stage {
  position: relative;
  display: inline-block;
  transform-origin: top left;
  will-change: transform;
}

.canvas-viewport {
  position: relative;
  display: inline-block;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
  transform-origin: top left;
  will-change: transform;
}

.canvas-viewport canvas {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  image-rendering: pixelated;
}

#baseCanvas,
#gridCanvas,
#selectionMaskCanvas,
#selectionContentCanvas,
#selectionOutlineCanvas {
  pointer-events: none;
}

#baseCanvas {
  z-index: 0;
}

#drawingCanvas {
  cursor: crosshair;
  touch-action: none;
  transition: cursor 0.15s ease;
  /* 移动端优化：提高渲染清晰度 */
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

/* 移动端画布优化 */
@media (max-width: 767px) {
  #drawingCanvas {
    /* 禁止触摸默认行为 */
    touch-action: none;
    /* 提高渲染精度 */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* 高清渲染 */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    image-rendering: high-quality;
  }
  
  .canvas-viewport {
    /* 移动端画布容器优化 */
    contain: layout paint;
    /* 高清渲染 */
    transform: translateZ(0);
    backface-visibility: hidden;
  }
  
  /* 优化 Canvas 文本渲染 */
  canvas {
    text-rendering: optimizeLegibility;
    -webkit-text-stroke: 0.3px rgba(0,0,0,0.5);
  }
}

#drawingCanvas.bucket-tool {
  cursor: cell;
}

#drawingCanvas.eyedropper-tool {
  cursor: crosshair;
}

#drawingCanvas.base-edit-mode {
  cursor: grab;
}

#gridCanvas {
  z-index: 7;
}

#gridCanvas.is-above-highlight {
  z-index: 7;
}

#drawingCanvas.is-base-dragging,
#drawingCanvas.is-panning {
  cursor: grabbing;
}

#drawingCanvas.pan-modifier {
  cursor: grab;
}

#drawingCanvas.pan-modifier.is-panning {
  cursor: grabbing;
}

#selectionMaskCanvas {
  z-index: 4;
}

#selectionContentCanvas {
  z-index: 5;
}

#selectionOutlineCanvas {
  z-index: 10;
}