/* HYPERPART: message-scroller */
/*
 * Chat transcript scroller — vertical stack of message rows with
 * max-height + overflow. Newest-at-bottom is document order (append
 * messages at the end; scrollHeight is host/controller concern).
 *
 * PLACEHOLDER — shadcn parity (HMC-042). Compose message Hyperparts inside.
 * Auto-scroll-to-bottom controller deferred.
 */

.dz-message-scroller {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  width: 100%;
  max-height: min(28rem, 70vh);
  overflow-x: hidden;
  overflow-y: auto;
  padding: var(--space-md);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background: var(--colour-surface);
  box-sizing: border-box;
  scroll-behavior: smooth;
}

.dz-message-scroller[data-dz-size="sm"] {
  max-height: 14rem;
  padding: var(--space-sm);
  gap: var(--space-sm);
}

.dz-message-scroller[data-dz-size="lg"] {
  max-height: min(40rem, 80vh);
}

.dz-message-scroller:focus-visible {
  outline: 2px solid var(--colour-brand);
  outline-offset: 2px;
}

/* Empty / loading affordance when no message children yet */
.dz-message-scroller__empty {
  margin: auto;
  padding: var(--space-lg);
  color: var(--colour-text-muted, var(--colour-text-secondary, #6b7280));
  font-size: var(--text-sm);
  text-align: center;
}