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200px);border:1px solid #e0e0e0;transition:background-color .2s,border-color .2s;box-shadow:0 2px 4px #0000001a}.kanban-column.drag-over{background-color:#e8f4f8;border-color:#4a90e2;border-style:dashed}.column-header{display:flex;align-items:center;justify-content:space-between;padding:16px;border-radius:8px 8px 0 0;color:#fff;position:relative}.column-title{margin:0;font-size:18px;font-weight:600;color:#fff;flex:1}.card-count{background-color:#ffffff4d;color:#fff;padding:4px 10px;border-radius:12px;font-size:12px;font-weight:600;min-width:24px;text-align:center;margin-right:8px}.add-column-btn{background-color:#fff3;border:none;border-radius:50%;width:28px;height:28px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#fff;font-size:18px;font-weight:700;transition:all .2s;padding:0}.add-column-btn:hover{background-color:#ffffff4d;transform:scale(1.1)}.column-content{flex:1;overflow-y:auto;margin:16px 16px 12px;min-height:100px}.column-content::-webkit-scrollbar{width:6px}.column-content::-webkit-scrollbar-track{background:#f0f0f0;border-radius:3px}.column-content::-webkit-scrollbar-thumb{background:#ccc;border-radius:3px}.column-content::-webkit-scrollbar-thumb:hover{background:#aaa}.add-card-button{width:calc(100% - 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