/**
 * Little Social - Modular Column Component
 * An isolated modular column module that adapts to single-column feeds
 * and horizontal multi-column deck views.
 */

.column {
  display: flex;
  flex-direction: column;
  height: 100%;
  background-color: var(--surface-bg);
  position: relative;
  overflow: hidden;
}

/* ==========================================================================
   Column Header (Sticky)
   ========================================================================== */
.column-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background-color: var(--surface-column-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  min-height: 54px;
}

.column-title-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.column-title-icon {
  color: var(--accent-primary);
  display: flex;
  align-items: center;
}

.column-title {
  font-size: var(--text-md);
  font-weight: var(--font-bold);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.column-badge {
  font-size: var(--text-sm);
  margin-left: var(--space-1);
}

.column-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.column-actions .btn-icon {
  width: 32px;
  height: 32px;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}

.column-actions .btn-icon:hover {
  background-color: var(--surface-card-hover);
  color: var(--text-primary);
}

/* ==========================================================================
   Column Sub-Navigation / Filter Bar
   ========================================================================== */
.column-filter-bar {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  background-color: var(--surface-card);
  border-bottom: 1px solid var(--border-color);
  gap: var(--space-2);
  overflow-x: auto;
  scrollbar-width: none;
}

.column-filter-bar::-webkit-scrollbar {
  display: none;
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.3rem 0.85rem;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  background-color: var(--surface-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.filter-pill:hover {
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

.filter-pill.active {
  background-color: var(--accent-primary);
  color: var(--accent-text);
  border-color: var(--accent-primary);
}

/* One account failed to load; the others keep working */
.filter-pill.is-error {
  border-color: var(--color-danger);
}

.filter-pill.is-error .icon {
  width: 14px;
  height: 14px;
  color: var(--color-danger);
}

.filter-pill.active.is-error .icon {
  color: inherit;
}

.column-account-error {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-danger);
  background-color: var(--color-danger-bg);
  border-bottom: 1px solid var(--border-color);
}

.column-account-error-text {
  flex: 1;
  min-width: 0;
}

.column-account-error .btn {
  flex-shrink: 0;
  font-size: var(--text-xs);
  padding: 0.2rem 0.65rem;
}

/* Sub-nav Tabs (for Account Timeline, Profile, etc.) */
.column-tabs {
  display: flex;
  background-color: var(--surface-column-header);
  border-bottom: 1px solid var(--border-color);
}

.column-tab {
  flex: 1;
  text-align: center;
  padding: var(--space-3) var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.column-tab:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.column-tab.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
  font-weight: var(--font-semibold);
}

/* ==========================================================================
   Column Body (.column-content)
   Container Query Context and Independent Scroll
   ========================================================================== */
.column-content {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  container-type: inline-size;
  container-name: column;
  background-color: var(--surface-card);
}

/* Floating "New Posts" Pill */
.floating-new-posts-pill {
  position: absolute;
  top: 66px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 15;
  background-color: var(--accent-primary);
  color: var(--accent-text);
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.floating-new-posts-pill:hover {
  background-color: var(--accent-hover);
  transform: translateX(-50%) translateY(-2px);
}

/* ==========================================================================
   Column States: loading, empty, error, pagination
   ========================================================================== */
.column-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-4);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.column-state.is-error {
  color: var(--color-danger);
}

.column-notice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-danger);
  background-color: var(--color-danger-bg);
  border-bottom: 1px solid var(--border-color);
}

.column-notice .btn-icon {
  width: 28px;
  height: 28px;
  color: inherit;
}

.column-load-more {
  display: flex;
  justify-content: center;
  padding: var(--space-4);
}

.column-load-more .btn {
  min-width: 10rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.column-load-more .btn[disabled] {
  opacity: 0.6;
  cursor: progress;
}