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Derivative financial assets (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments    
Derivative financial assets, fair value ¥ 40,356 ¥ 38,008
Derivative financial assets, notional amount 386,542 364,302
Foreign exchange swaps    
Disclosure of detailed information about financial instruments    
Derivative financial assets, fair value   388
Derivative financial assets, notional amount   5,666
Currency forwards    
Disclosure of detailed information about financial instruments    
Derivative financial assets, fair value 40,356 37,620
Derivative financial assets, notional amount ¥ 386,542 ¥ 358,636