.heatmap-card {
  display:flex;
  flex-direction:column;
  gap:1rem;
}

.heatmap-header {
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:0.5rem;
}

.heatmap-title {
  margin:0;
}

.heatmap-note {
  color:var(--muted);
  font-size:0.95rem;
}

.heatmap-table {
  min-width:560px;
}

.heatmap-table thead th {
  text-align:center;
}

.heatmap-table tbody th {
  text-align:left;
  color:var(--text);
  background:var(--panel);
}

.heatmap-table th:first-child,
.heatmap-table td:first-child {
  position:sticky;
  left:0;
  z-index:2;
  background:var(--panel);
  box-shadow:2px 0 0 rgba(0,0,0,0.35);
}

.heatmap-table thead th:first-child {
  z-index:3;
}

.heatmap-table td {
  text-align:center;
  vertical-align:middle;
  min-width:88px;
  font-variant-numeric:tabular-nums;
  transition:background-color 0.2s ease, color 0.2s ease;
}

.heatmap-table td.heatmap-empty {
  opacity:0.4;
}

.heatmap-table td.heatmap-cell {
  color:var(--text);
  font-weight:600;
}

.heatmap-table td.heatmap-cell span {
  display:block;
}

.heatmap-message {
  color:var(--muted);
  font-size:0.95rem;
}

@media (max-width: 720px) {
  .heatmap-table {
    min-width:100%;
  }
}