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Share-based payments - Fair value of the restricted share units (Details) - Restricted Share Units Scheme
Dec. 31, 2022
CNY (¥)
EquityInstruments
Dec. 31, 2021
EquityInstruments
Dec. 31, 2020
EquityInstruments
Dec. 31, 2019
EquityInstruments
Disclosure of terms and conditions of share-based payment arrangement        
Number of restricted share units 36,232,094 16,552,829 1,751,702 2,306,000
September 2019        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 35.22      
Number of restricted share units 204,503 545,383    
January 2020        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 16.18      
Number of restricted share units 11,509 18,000    
April 2020        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 16.98      
Number of restricted share units 45,008 82,500    
July 2020        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 38.67      
Number of restricted share units 1,502 17,250    
June 2021, One        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 13.69      
Number of restricted share units 248,043 503,076    
June 2021, Two        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 14.31      
Number of restricted share units 7,502 226,000    
June 2021, Three        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 14.93      
Number of restricted share units 112,500 1,279,800    
July 2021        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 15.16      
Number of restricted share units 147,751 252,000    
September 2021        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 5.53      
Number of restricted share units 4,198,965 7,346,000    
October 2021, One        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 5.25      
Number of restricted share units 116,593 448,000    
October 2021, Two        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 3.91      
Number of restricted share units   2,820    
October 2021, Three        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 4.68      
Number of restricted share units 3,973,655 5,832,000    
January 2022, One        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 2.40      
Number of restricted share units 126,862      
January 2022, Two        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 2.41      
Number of restricted share units 1,740,001      
January 2022, Three        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 3.29      
Number of restricted share units 567,700      
January 2022, Four        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 2.64      
Number of restricted share units 300,000      
April 2022        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 1.78      
Number of restricted share units 130,000      
July 2022        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 2.72      
Number of restricted share units 40,000      
October 2022        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 0.98      
Number of restricted share units 80,000      
December 2022        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 0.81      
Number of restricted share units 24,180,000