.chart-container {
  width: 100%;
  height: 280px;
}
.chart-placeholder {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  color: var(--text-muted);
  font-size: 0.875rem;
  background: var(--bg-tertiary);
  border-radius: 12px;
}
@media (max-width: 480px) {
  .chart-container {
    height: 180px;
  }
}