/* 拖拽相关样式 */
.card.resizing {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transform: scale(1.02);
    transition: none;
}

/* 拖拽占位符样式 */
.drag-placeholder {
    border: 2px dashed #3498db;
    background-color: rgba(52, 152, 219, 0.1);
    visibility: hidden;
}

/* 拖拽中的卡片样式 */
.card.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
}

/* 防止拖拽过程中选中文本 */
.card.resizing,
.card.resizing * {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.card.dragging,
.card.dragging * {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}