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Share-based payments - Movements of share options (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
CNY (¥)
EquityInstruments
¥ / shares
Dec. 31, 2023
CNY (¥)
EquityInstruments
¥ / shares
Dec. 31, 2022
EquityInstruments
Disclosure of terms and conditions of share-based payment arrangement      
At the beginning of the year | ¥ 8,141,810    
At the end of the year | ¥ 6,830,110 8,141,810  
Disclosure of number and weighted average remaining contractual life of outstanding share options      
Weighted-average exercise price | ¥ / shares ¥ 29.99 ¥ 18.02  
Weighted-average remaining contractual life 4 years 1 month 28 days 4 years 2 months 19 days  
Stock options      
Disclosure of terms and conditions of share-based payment arrangement      
At the beginning of the year 8,141,810 10,137,344 12,725,995
Exercised     (621,930)
Forfeited (1,311,700) (1,995,534) (1,966,721)
At the end of the year 6,830,110 8,141,810 10,137,344