/**
 * Canvas 繪圖工具樣式
 * Phase 5.2
 */

/* ============================================
   容器
   ============================================ */
.canvas-drawing-showcase {
  padding: var(--spacing-6);
}

.canvas-drawing-showcase .showcase-header {
  text-align: center;
  margin-bottom: var(--spacing-6);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  padding: var(--spacing-6);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
}

.canvas-drawing-showcase .showcase-header h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-2);
}

/* ============================================
   工具列
   ============================================ */
.canvas-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  padding: var(--spacing-4);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-4);
}

.tool-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.tool-group-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-right: var(--spacing-2);
  white-space: nowrap;
}

.tool-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  font-size: 18px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tool-btn:hover {
  border-color: var(--color-cyan);
  background: rgba(0, 217, 255, 0.1);
}

.tool-btn.active {
  border-color: var(--color-cyan);
  background: rgba(0, 217, 255, 0.2);
  box-shadow: 0 0 10px rgba(0, 217, 255, 0.3);
}

/* 顏色選擇器 */
#brush-color {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 2px solid var(--color-border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  background: transparent;
}

#brush-color::-webkit-color-swatch-wrapper {
  padding: 2px;
}

#brush-color::-webkit-color-swatch {
  border-radius: 4px;
  border: none;
}

/* 顏色預設 */
.color-presets {
  display: flex;
  gap: var(--spacing-1);
}

.color-preset {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border-default);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.color-preset:hover {
  transform: scale(1.2);
  border-color: var(--color-cyan);
}

/* 大小滑桿 */
#brush-size {
  width: 100px;
  height: 6px;
  -webkit-appearance: none;
  background: var(--color-bg-card);
  border-radius: var(--radius-full);
  cursor: pointer;
}

#brush-size::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-cyan);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s ease;
}

#brush-size::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* ============================================
   畫布區
   ============================================ */
.canvas-container {
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #0F172A;
  margin-bottom: var(--spacing-4);
}

#drawing-canvas {
  display: block;
  width: 100%;
  cursor: crosshair;
}

/* ============================================
   操作列
   ============================================ */
.canvas-actions {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.action-group {
  display: flex;
  gap: var(--spacing-2);
}

/* ============================================
   快捷鍵提示
   ============================================ */
.shortcut-hints {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  padding: var(--spacing-3);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.shortcut-hints .hint {
  padding: var(--spacing-1) var(--spacing-2);
  background: var(--color-bg-card);
  border-radius: var(--radius-sm);
}

/* ============================================
   響應式
   ============================================ */
@media (max-width: 768px) {
  .canvas-toolbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .tool-group {
    flex-wrap: wrap;
  }

  #brush-size {
    width: 100%;
    max-width: 150px;
  }

  .canvas-actions {
    flex-direction: column;
  }

  .action-group {
    flex-wrap: wrap;
  }

  .shortcut-hints {
    display: none; /* 移動端隱藏快捷鍵提示 */
  }
}