/* CSS Variables for theming */
.container {
  --color-bg: #ffffff;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;

  /* Retention colors */
  --color-retention-high: #22c55e;
  --color-retention-medium: #eab308;
  --color-retention-low: #f97316;
  --color-retention-critical: #ef4444;

  --color-highlight: rgba(59, 130, 246, 0.2);
}

@media (prefers-color-scheme: dark) {
  .container {
    --color-bg: #111827;
    --color-text: #f9fafb;
    --color-text-muted: #9ca3af;
    --color-border: #374151;
    --color-highlight: rgba(96, 165, 250, 0.25);
  }
}

/* Layout */
.container {
  display: flex;
  flex-direction: column;
  height: 600px;
  max-height: 600px;
  overflow: hidden;
  padding: 12px;
  gap: 8px;
  background: var(--color-bg);
  color: var(--color-text);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  flex-wrap: wrap;
  gap: 8px;
}

.title {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  white-space: nowrap;
}

.controls {
  display: flex;
  gap: 12px;
}

.control {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.control select {
  padding: 4px 8px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: inherit;
}

/* Heatmap Grid */
.heatmapWrapper {
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
}

.heatmapGrid {
  display: grid;
  gap: 2px;
  width: max-content;
}

.headerCorner {
  width: 120px;
}

.headerPeriod {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  height: 20px;
}

.headerPeriod.highlighted {
  background: var(--color-highlight);
  border-radius: 4px;
}

/* Row Labels */
.label {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-right: 8px;
  width: 120px;
}

.label.highlighted {
  background: var(--color-highlight);
  border-radius: 4px;
}

.cohortName {
  font-weight: 600;
  font-size: 13px;
}

.cohortSize {
  font-size: 11px;
  color: var(--color-text-muted);
}

/* Data Cells */
.cell {
  width: 44px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  border-radius: 3px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
}

.cell:hover {
  transform: scale(1.1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  z-index: 10;
}

.cell.highlighted {
  outline: 2px solid var(--color-text);
  outline-offset: 1px;
}

.cellEmpty {
  width: 44px;
  height: 32px;
  background-color: var(--color-border);
  border-radius: 3px;
  opacity: 0.3;
}

/* Legend */
.legend {
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  gap: 16px;
  font-size: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

.legendItem {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legendColor {
  width: 16px;
  height: 16px;
  border-radius: 3px;
}

/* Tooltip */
.tooltip {
  position: fixed;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  pointer-events: none;
  z-index: 100;
  min-width: 180px;
}

.tooltipHeader {
  font-weight: 600;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.tooltipRow {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-top: 4px;
}

.tooltipLabel {
  color: var(--color-text-muted);
}

.tooltipValue {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* Loading/Error states */
.loading, .error {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: 14px;
}

.error {
  color: var(--color-retention-critical);
}