src/App.css

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.file-preview-item {
  transition: all 0.15s ease;
}

.file-preview-item:hover {
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

/* Image lightbox effect */
.file-attachment-image .group:hover .group-hover\\:opacity-100 {
  opacity: 1;
}

/* Mention tag styles */
.mention-tag {
  display: inline-block;
  padding: 0 2px;
  border-radius: 4px;
  transition: background-color 0.15s ease;
}

.mention-tag:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

/* Chat input placeholder */
.chat-input-placeholder {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-muted, #6b7280);
  font-size: 0.875rem;
}

/* Scrollbar styling */
.overflow-y-auto::-webkit-scrollbar {
  width: 6px;
}

.overflow-y-auto::-webkit-scrollbar-track {
  background: transparent;
}

.overflow-y-auto::-webkit-scrollbar-thumb {
  background: var(--border-primary, #e5e7eb);
  border-radius: 3px;
}

.overflow-y-auto::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted, #9ca3af);
}