/* ============================================
   TOOLSLAB — CHAT HISTORY
   Styles for sidebar chat history list,
   grouping labels, and delete affordances.
   ============================================ */

.sidebar-group {
  margin-bottom: var(--sp-5);
}

.sidebar-group-label {
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  padding: var(--sp-2) var(--sp-3);
}

.chat-item {
  display: block;
  position: relative;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-md);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
  cursor: pointer;
}
.chat-item:hover {
  background: var(--bg-surface-2);
  color: var(--text-primary);
}
.chat-item.is-active {
  background: var(--bg-surface-2);
  color: var(--text-primary);
  font-weight: 500;
}

.chat-item-delete {
  position: absolute;
  right: var(--sp-2);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  background: var(--bg-surface-2);
  border-radius: 4px;
  color: var(--text-muted);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.chat-item:hover .chat-item-delete {
  opacity: 1;
  pointer-events: auto;
}
.chat-item-delete:hover {
  color: var(--accent);
}