.enhanced-kanban-group {
  width: 300px;
  min-width: 300px;
  max-width: 300px;
  background: var(--ant-color-bg-elevated);
  border-radius: 8px;
  padding: 12px;
  border: 1px solid var(--ant-color-border);
  box-shadow: 0 1px 2px var(--ant-color-shadow);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.enhanced-kanban-group.drag-over {
  border-color: var(--ant-color-primary);
  box-shadow: 0 0 0 2px var(--ant-color-primary-border);
}

.enhanced-kanban-group.group-dragging {
  opacity: 0.5;
  z-index: 1000;
  box-shadow: 0 8px 24px var(--ant-color-shadow);
}

.enhanced-kanban-group.group-dragging .enhanced-kanban-group-tasks {
  background: var(--ant-color-bg-elevated);
}

.enhanced-kanban-group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--ant-color-border);
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  transition: all 0.2s ease;
  border-radius: 6px;
  padding: 8px 12px;
  margin: -8px -8px 4px -8px;
}

.enhanced-kanban-group-header:active {
  cursor: grabbing;
}

.enhanced-kanban-group-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: inherit;
  text-shadow: 0 1px 2px var(--ant-color-shadow);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
  display: inline-block;
  vertical-align: middle;
}

.task-count {
  background: var(--ant-color-bg-container);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  color: var(--ant-color-text);
  font-weight: 500;
  border: 1px solid var(--ant-color-border);
  opacity: 0.8;
}

.virtualization-indicator {
  background: var(--ant-color-warning);
  color: var(--ant-color-warning-text);
  padding: 2px 6px;
  border-radius: 8px;
  font-size: 10px;
  font-weight: 600;
  cursor: help;
  transition: all 0.2s ease;
}

.virtualization-indicator:hover {
  background: var(--ant-color-warning-hover);
  transform: scale(1.1);
}

.enhanced-kanban-group-tasks {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 200px;
  max-height: 600px;
  transition: all 0.2s ease;
  overflow-y: auto;
  overflow-x: hidden;
  background: transparent;
}

/* Performance optimizations for large lists */
.enhanced-kanban-group-tasks.large-list {
  contain: layout style paint;
  will-change: transform;
}

/* Drop preview indicators */
.drop-preview-indicator {
  height: 4px;
  margin: 4px 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.drop-line {
  height: 2px;
  background: var(--ant-color-primary);
  border-radius: 1px;
  width: 100%;
  box-shadow: 0 0 4px var(--ant-color-primary);
  animation: dropPulse 1.5s ease-in-out infinite;
}

@keyframes dropPulse {
  0%,
  100% {
    opacity: 0.6;
    transform: scaleX(0.8);
  }
  50% {
    opacity: 1;
    transform: scaleX(1);
  }
}

/* Empty state drop zone */
.drop-preview-empty {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--ant-color-border);
  border-radius: 6px;
  background: var(--ant-color-bg-container);
  transition: all 0.2s ease;
}

.enhanced-kanban-group.drag-over .drop-preview-empty {
  border-color: var(--ant-color-primary);
}

.drop-indicator {
  color: var(--ant-color-text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.enhanced-kanban-group.drag-over .drop-indicator {
  color: var(--ant-color-primary);
}

/* Group drag overlay */
.group-drag-overlay {
  background: var(--ant-color-bg-elevated);
  border: 1px solid var(--ant-color-border);
  border-radius: 8px;
  padding: 12px;
  box-shadow: 0 8px 24px var(--ant-color-shadow);
  min-width: 280px;
  max-width: 320px;
  opacity: 0.9;
  pointer-events: none;
  z-index: 1000;
}

.group-drag-overlay .group-header-content {
  display: flex;
  align-items: center;
  gap: 8px;
}

.group-drag-overlay h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ant-color-text);
}

.group-drag-overlay .task-count {
  background: var(--ant-color-bg-container);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  color: var(--ant-color-text);
  border: 1px solid var(--ant-color-border);
}

/* Responsive design for different screen sizes */
@media (max-width: 768px) {
  .enhanced-kanban-group {
    min-width: 240px;
    max-width: 280px;
  }

  .enhanced-kanban-group-tasks {
    max-height: 400px;
  }
}

@media (max-width: 480px) {
  .enhanced-kanban-group {
    min-width: 200px;
    max-width: 240px;
  }

  .enhanced-kanban-group-tasks {
    max-height: 300px;
  }
}

.enhanced-kanban-task-card {
  width: 100%;
  box-sizing: border-box;
}

.task-title {
  font-weight: 500;
  color: var(--ant-color-text);
  margin-bottom: 4px;
  line-height: 1.4;
  word-break: break-word;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
  display: inline-block;
  vertical-align: middle;
}