/* History / Change Log Component
 * ==========================================================================
 * Two-column layout showing current content preview and timeline of changes.
 * Reference: Basecamp "History of changes" pattern
 */

/* History Layout
 * -------------------------------------------------------------------------- */

.history-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 48em) {
  .history-layout {
    grid-template-columns: 1fr;
  }
}

/* History Preview Card (Left Column)
 * -------------------------------------------------------------------------- */

.history-preview {
  position: sticky;
  top: 1rem;
}

.history-preview__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  background: var(--color-bg--tertiary-container);
  color: var(--color-ink--tertiary-container);
  border-radius: 1rem;
  font-size: var(--font-size-x-small);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.history-preview__card {
  background: var(--color-bg--surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
}

.history-preview__title {
  font-size: var(--font-size-large);
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 0.75rem;
  color: var(--color-ink--surface);
}

.history-preview__author {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: var(--font-size-small);
  color: var(--color-ink--surface);
}

.history-preview__excerpt {
  font-size: var(--font-size-small);
  line-height: 1.6;
  color: var(--color-ink--surface);
  opacity: 0.8;
}

/* Timeline (Right Column)
 * -------------------------------------------------------------------------- */

.history-timeline {
  padding-top: 0.5rem;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

/* Timeline vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--color-border);
}

.timeline__item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 1.5rem;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

/* Timeline dot marker */
.timeline__marker {
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--color-tertiary);
  border-radius: 50%;
  border: 2px solid var(--color-bg--canvas);
  box-shadow: 0 0 0 2px var(--color-tertiary);
}

.timeline__content {
  padding-top: 0;
}

.timeline__date {
  display: block;
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-ink--canvas);
  opacity: 0.7;
  margin-bottom: 0.25rem;
}

.timeline__description {
  font-size: var(--font-size-medium);
  line-height: 1.5;
  color: var(--color-ink--canvas);
  margin: 0;
}

/* Empty state for no events */
.empty-state--compact {
  padding: 2rem;
  text-align: center;
}

.empty-state--compact .empty-state__icon {
  opacity: 0.3;
  margin-bottom: 0.5rem;
}

.empty-state--compact .empty-state__text {
  color: var(--color-ink--canvas);
  opacity: 0.6;
  margin: 0;
}

/* Dark mode adjustments
 * -------------------------------------------------------------------------- */

[data-color-scheme="dark"] {
  .history-preview__card {
    background: var(--color-bg--surface);
    border-color: var(--color-border);
  }

  .timeline__marker {
    border-color: var(--color-bg--canvas);
  }
}