/* ============================================================
   Section 5 — AI 工具圖（Heatmap）
   ============================================================ */

#ai-chart {
  background: var(--color-bg);
}

.ai-heatmap-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.ai-heatmap {
  min-width: 640px;
}

/* --- Header（Logo + Tooltip）--- */
.ai-heatmap__header {
  display: grid;
  align-items: end;
  gap: 0;
  margin-bottom: var(--space-2);
  overflow: visible;
}

.ai-heatmap__header-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: var(--space-3) var(--space-1);
  overflow: visible;
}

.ai-tool-logo {
  width: 24px;
  height: 24px;
  object-fit: contain;
  display: block;
  transition: var(--transition-fast);
}

.ai-heatmap__header-cell:hover .ai-tool-logo {
  transform: scale(1.15);
}

/* Tooltip */
.ai-tool-tooltip {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a1a1a;
  color: #fff;
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  padding: 4px 8px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 100;
}

.ai-tool-tooltip::after {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-bottom-color: #1a1a1a;
}

.ai-heatmap__header-cell:hover .ai-tool-tooltip {
  opacity: 1;
}

/* --- 每個人的 row --- */
.ai-heatmap__row {
  display: grid;
  gap: 0;
  margin-bottom: 4px;
  align-items: center;
}

.ai-heatmap__identity {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-right: var(--space-4);
}

.ai-heatmap__avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top;
  flex-shrink: 0;
}

.ai-heatmap__name {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
}

/* --- 格子 --- */
.ai-cell {
  height: 40px;
  border-radius: 6px;
  background: #F2F2EF;
  margin: 0 2px;
  transition: var(--transition-fast);
}

.ai-cell.is-used {
  opacity: 0.82;
}

.ai-cell.is-used:hover {
  opacity: 1;
  transform: scaleY(1.06);
}