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Deferred income tax - Deferred tax Assets (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Movements of deferred tax assets    
Deferred tax assets, Opening balance ¥ 792,802 ¥ 779,395
Recognized in the profit or loss (475,441) 13,407
Deferred tax assets, Closing balance 317,361 792,802
Tax losses    
Movements of deferred tax assets    
Deferred tax assets, Opening balance 582,625 542,241
Recognized in the profit or loss (422,992) 40,384
Deferred tax assets, Closing balance 159,633 582,625
Accelerated amortization of intangible assets    
Movements of deferred tax assets    
Deferred tax assets, Opening balance 157,912 185,248
Recognized in the profit or loss (31,479) (27,336)
Deferred tax assets, Closing balance 126,433 157,912
Others    
Movements of deferred tax assets    
Deferred tax assets, Opening balance 52,265 51,906
Recognized in the profit or loss (20,970) 359
Deferred tax assets, Closing balance ¥ 31,295 ¥ 52,265