/* PreciseDragDrop.css */
.precise-drag-drop {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #333;
}

.header {
  text-align: center;
  margin-bottom: 40px;
}

.header h1 {
  color: #2c3e50;
  margin-bottom: 10px;
  font-weight: 600;
  font-size: 2rem;
}

.header p {
  color: #7f8c8d;
  font-size: 1.1rem;
}

.containers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 40px;
}

.container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.container.drag-over {
  border-color: #3498db;
  background-color: #f8fafc;
  transform: scale(1.02);
}

.container-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.container-header h2 {
  margin: 0;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.count {
  background: rgba(255, 255, 255, 0.2);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.clear-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.3s ease;
}

.clear-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.items-list {
  padding: 20px;
  min-height: 500px;
  max-height: 600px;
  overflow-y: auto;
  position: relative;
}

.item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px;
  margin-bottom: 8px;
  background: white;
  border-radius: 8px;
  border-left: 4px solid var(--item-color);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  cursor: grab;
  position: relative;
}

.item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.item.dragging {
  opacity: 0.6;
  cursor: grabbing;
  transform: rotate(3deg) scale(1.05);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.item.drag-over.insert-above {
  border-top: 2px dashed var(--item-color);
  margin-top: 4px;
}

.item.drag-over.insert-below {
  border-bottom: 2px dashed var(--item-color);
  margin-bottom: 4px;
}

.item-content {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.item-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--item-color);
  color: white;
  border-radius: 50%;
  font-size: 0.9rem;
  font-weight: bold;
  flex-shrink: 0;
}

.item-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
}

.item-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.item-title {
  font-weight: 500;
  font-size: 1rem;
}

.priority-tag {
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  width: fit-content;
}

.priority-high {
  background: #ffebee;
  color: #c62828;
}

.priority-medium {
  background: #fff3e0;
  color: #ef6c00;
}

.priority-low {
  background: #e8f5e8;
  color: #2e7d32;
}

.item-type {
  background: #f1f3f4;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  color: #666;
  text-transform: capitalize;
  flex-shrink: 0;
}

.item-actions {
  display: flex;
  align-items: center;
}

.drag-handle {
  color: #bdc3c7;
  font-size: 16px;
  cursor: grab;
  padding: 8px;
  user-select: none;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.drag-handle:hover {
  color: #7f8c8d;
  background: #f5f5f5;
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: #95a5a6;
}

.empty-state p {
  margin: 0 0 8px 0;
  font-size: 1.1rem;
  font-weight: 500;
}

.empty-state span {
  font-size: 0.9rem;
}

/* 插入位置指示器 */
.insert-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  margin: 4px 0;
  opacity: 0.8;
  animation: pulse 1.5s infinite;
}

.insert-indicator.above {
  margin-bottom: 0;
}

.insert-indicator.below {
  margin-top: 0;
}

.indicator-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--item-color, #3498db), transparent);
}

.indicator-arrow {
  color: var(--item-color, #3498db);
  font-weight: bold;
  font-size: 0.9rem;
  padding: 0 8px;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.instructions {
  background: #f8f9fa;
  padding: 25px;
  border-radius: 12px;
  border-left: 4px solid #3498db;
}

.instructions h3 {
  margin-top: 0;
  color: #2c3e50;
  text-align: center;
  margin-bottom: 20px;
  font-size: 1.3rem;
}

.instruction-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.instruction {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.instruction:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.instruction .icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.instruction strong {
  display: block;
  margin-bottom: 5px;
  color: #2c3e50;
  font-size: 1rem;
}

.instruction p {
  margin: 0;
  color: #7f8c8d;
  font-size: 0.9rem;
  line-height: 1.4;
}

/* 动画效果 */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.item {
  animation: slideIn 0.3s ease;
}

/* 滚动条样式 */
.items-list::-webkit-scrollbar {
  width: 6px;
}

.items-list::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 3px;
}

.items-list::-webkit-scrollbar-thumb {
  background: #c1c1c1;
  border-radius: 3px;
}

.items-list::-webkit-scrollbar-thumb:hover {
  background: #a8a8a8;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .containers {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .precise-drag-drop {
    padding: 15px;
  }
  
  .instruction-grid {
    grid-template-columns: 1fr;
  }
  
  .container-header {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }
  
  .header-actions {
    align-self: flex-end;
  }
  
  .item-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .item-info {
    width: 100%;
  }
}