/* ========================================
   画布页样式 - 画布布局、工具栏、图层面板等
   ======================================== */

/* ---- 画布页布局 ---- */
.canvas-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding-top: var(--nav-height);
  background: var(--color-cream);
  overflow: hidden;
}

.canvas-page__body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ---- 工具栏 ---- */
.toolbar {
  width: var(--toolbar-width);
  background: var(--color-white);
  border-right: 1px solid var(--color-gray);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-sm) 0;
  gap: 2px;
  overflow-y: auto;
  flex-shrink: 0;
}

.toolbar__group {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  padding: var(--space-xs) 0;
}

.toolbar__group + .toolbar__group {
  border-top: 1px solid var(--color-gray);
}

.tool-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-gray-dark);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  border: 2px solid transparent;
}

.tool-btn:hover {
  background: var(--color-cream);
  color: var(--color-ink);
}

.tool-btn:active {
  transform: scale(0.92);
}

.tool-btn--active {
  background: rgba(196, 26, 26, 0.08);
  color: var(--color-red);
  border-color: var(--color-red);
}

.tool-btn--active::after {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--color-red);
  border-radius: 0 2px 2px 0;
}

.tool-btn__tooltip {
  position: absolute;
  left: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  padding: 4px 10px;
  background: var(--color-ink);
  color: var(--color-white);
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 10;
}

.tool-btn:hover .tool-btn__tooltip {
  opacity: 1;
}

/* ---- 画布容器 ---- */
.canvas-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  background: var(--color-gray);
  background-image:
    linear-gradient(45deg, var(--color-cream) 25%, transparent 25%),
    linear-gradient(-45deg, var(--color-cream) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--color-cream) 75%),
    linear-gradient(-45deg, transparent 75%, var(--color-cream) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  overflow: auto;
}

.canvas-container__canvas {
  background: var(--color-white);
  box-shadow:
    0 4px 20px rgba(44, 44, 44, 0.15),
    0 0 0 1px rgba(201, 168, 76, 0.2);
  border: 2px solid var(--color-gold);
  cursor: crosshair;
  transition: box-shadow var(--transition-normal);
  position: relative;
}

.canvas-container__canvas:hover {
  box-shadow:
    0 8px 32px rgba(44, 44, 44, 0.2),
    0 0 0 1px var(--color-gold);
}

/* ---- 响应式适配 ---- */
@media (max-width: 768px) {
  .canvas-page__body {
    flex-direction: column;
  }

  .toolbar {
    width: 100%;
    flex-direction: row;
    border-right: none;
    border-bottom: 1px solid var(--color-gray);
    padding: 0 var(--space-sm);
    overflow-x: auto;
    overflow-y: hidden;
  }

  .toolbar__group {
    flex-direction: row;
    padding: 0 var(--space-xs);
  }

  .toolbar__group + .toolbar__group {
    border-top: none;
    border-left: 1px solid var(--color-gray);
  }

  .tool-btn {
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
  }

  .tool-btn--active::after {
    left: 50%;
    top: auto;
    bottom: 0;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    border-radius: 2px 2px 0 0;
  }

  .tool-btn__tooltip {
    left: 50%;
    top: auto;
    bottom: calc(100% + 8px);
    transform: translateX(-50%);
  }

  .canvas-container {
    padding: var(--space-sm);
  }
}