.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.app-main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: var(--space-lg);
  padding: var(--space-lg);
}

.stage-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-width: 0;
}

.side-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

@media (max-width: 860px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}