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Share-based payments - Fair value of the restricted share units (Details) - Restricted Share Units Scheme
Dec. 31, 2024
CNY (¥)
EquityInstruments
Dec. 31, 2023
EquityInstruments
Dec. 31, 2022
EquityInstruments
Dec. 31, 2021
EquityInstruments
Disclosure of terms and conditions of share-based payment arrangement        
Number of restricted share units 23,129,137 30,526,123 36,232,094 16,552,829
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 158,807 158,807    
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 11,502 11,502    
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 42,505 42,505    
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 1,500 1,500    
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 125,030 155,040    
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 7,500 7,500    
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 37,500 112,500    
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 99,001 99,001    
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 2,721,253 3,335,253    
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 67,501 70,001    
October 2021, Two        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 4.68      
Number of restricted share units 3,239,591 3,444,091    
January 2022, One        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 2.4      
Number of restricted share units 96,421 103,397    
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 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 432,265 462,265    
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 165,760 365,760    
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 40,000 130,000    
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 25,000 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 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 12,965,500 19,977,000    
January 2023        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 0.71      
Number of restricted share units 62,500 190,000    
December 2024, One        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 0.39      
Number of restricted share units 760,000      
December 2024, Two        
Disclosure of terms and conditions of share-based payment arrangement        
Fair value of restricted share units | ¥ ¥ 0.44      
Number of restricted share units 250,000