/**
 * Room History Panel
 * ==================
 * Cross-session room history with infinite scroll.
 * Uses design tokens from: terminal/_tokens.css
 */

/* ========================================
 * Base Container
 * ======================================== */

.room-history {
  display: flex;
  flex-direction: column;
  min-height: 0;
  flex: 1;
}

.room-history__container {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  overflow-y: auto;
  padding: var(--space-2);
  flex: 1;
  min-height: 0;
}

/* ========================================
 * Toggle Button
 * ======================================== */

.room-history__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all 0.15s ease;
}

.room-history__toggle:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-border-hover);
  color: var(--color-text-primary);
}

.room-history__toggle:focus {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 1px;
}

.room-history__toggle--active {
  background: color-mix(in srgb, var(--color-accent-primary) 15%, var(--color-bg-secondary));
  border-color: var(--color-accent-primary);
  color: var(--color-accent-primary);
}

.room-history__toggle--active:hover {
  background: color-mix(in srgb, var(--color-accent-primary) 25%, var(--color-bg-secondary));
}

.room-history__toggle-icon {
  font-size: var(--font-size-sm);
}

/* ========================================
 * Session Boundary Divider
 * ======================================== */

.room-history__session-boundary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  -webkit-user-select: none;
  user-select: none;
}

.room-history__session-boundary-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-border-subtle) 20%,
    var(--color-border-subtle) 80%,
    transparent
  );
}

.room-history__session-boundary-label {
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
}

/* ========================================
 * History Entry
 * ======================================== */

.room-history__entry {
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-text-muted);
}

.room-history__entry--dm {
  border-left-color: var(--color-accent-primary);
}

.room-history__entry--player,
.room-history__entry--user {
  border-left-color: var(--color-accent-secondary);
  background: color-mix(in srgb, var(--color-accent-secondary) 5%, var(--color-bg-primary));
}

.room-history__entry--system {
  border-left-color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.room-history__entry--error {
  border-left-color: var(--color-accent-error);
  background: color-mix(in srgb, var(--color-accent-error) 5%, var(--color-bg-primary));
}

.room-history__entry-content {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
}

/* Ensure nested narrative segments display correctly */
.room-history__entry-content .narrative-segment {
  margin-bottom: var(--space-1);
}

.room-history__entry-content .narrative-segment:last-child {
  margin-bottom: 0;
}

.room-history__entry-meta {
  display: flex;
  justify-content: flex-end;
  margin-top: var(--space-1);
}

.room-history__entry-meta time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

/* ========================================
 * Loading State
 * ======================================== */

.room-history__loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  gap: var(--space-2);
}

.room-history__loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border-subtle);
  border-top-color: var(--color-accent-primary);
  border-radius: 50%;
  animation: room-history-spin 0.8s linear infinite;
}

@keyframes room-history-spin {
  to {
    transform: rotate(360deg);
  }
}

.room-history__loading-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ========================================
 * Empty State
 * ======================================== */

.room-history__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  text-align: center;
}

.room-history__empty-icon {
  font-size: 2rem;
  margin-bottom: var(--space-3);
  opacity: 0.5;
}

.room-history__empty-message {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-2) 0;
}

.room-history__empty-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin: 0;
  font-style: italic;
}

/* ========================================
 * Error State
 * ======================================== */

.room-history__error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  text-align: center;
  background: color-mix(in srgb, var(--color-accent-error) 5%, var(--color-bg-secondary));
  border: 1px solid color-mix(in srgb, var(--color-accent-error) 30%, transparent);
  border-radius: var(--radius-md);
}

.room-history__error-icon {
  font-size: 1.5rem;
  color: var(--color-accent-error);
  margin-bottom: var(--space-2);
}

.room-history__error-message {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ========================================
 * Sentinel (Infinite Scroll Trigger)
 * ======================================== */

.room-history__sentinel {
  height: 1px;
  width: 100%;
  visibility: hidden;
}

/* ========================================
 * Header Bar (contains toggle)
 * ======================================== */

.room-history__header {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: var(--space-2);
  border-bottom: 1px solid var(--color-border-subtle);
  background: var(--color-bg-secondary);
}

/* ========================================
 * Hidden Utility
 * ======================================== */

.room-history .hidden {
  display: none !important;
}

/* ========================================
 * Responsive
 * ======================================== */

@media (max-width: 768px) {
  .room-history__toggle {
    padding: var(--space-2);
    font-size: var(--font-size-sm);
  }

  .room-history__entry {
    padding: var(--space-2);
  }

  .room-history__session-boundary-label {
    font-size: 10px;
    padding: var(--space-1) var(--space-2);
  }
}

/* ========================================
 * Reduced Motion
 * ======================================== */

@media (prefers-reduced-motion: reduce) {
  .room-history__loading-spinner {
    animation: none;
    border-top-color: var(--color-accent-primary);
    opacity: 0.7;
  }

  .room-history__toggle {
    transition: none;
  }
}