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Deferred income tax - Deferred tax Assets (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Movements of deferred tax assets      
Deferred tax assets, Opening balance ¥ 683,218 ¥ 564,562 ¥ 423,786
Recognized in the profit or loss 82,741 118,656 140,776
Deferred tax assets, Closing balance 765,959 683,218 564,562
Tax losses      
Movements of deferred tax assets      
Deferred tax assets, Opening balance 429,901 312,908 180,142
Recognized in the profit or loss 112,340 116,993 132,766
Deferred tax assets, Closing balance 542,241 429,901 312,908
Accelerated amortization of intangible assets      
Movements of deferred tax assets      
Deferred tax assets, Opening balance 206,522 212,035 218,056
Recognized in the profit or loss (21,274) (5,513) (6,021)
Deferred tax assets, Closing balance 185,248 206,522 212,035
Others      
Movements of deferred tax assets      
Deferred tax assets, Opening balance 46,795 39,619 25,588
Recognized in the profit or loss (8,325) 7,176 14,031
Deferred tax assets, Closing balance ¥ 38,470 ¥ 46,795 ¥ 39,619