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Management of financial risk - Fair value measurement (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of assets    
Derivative financial assets, fair value ¥ 40,356 ¥ 38,008
Derivative financial assets 40,356 38,008
Financial assets held at FVPL    
Disclosure of fair value measurement of assets    
Derivative financial assets, fair value 455,016 925,204
Financial assets measured at fair value through other comprehensive income (Note 18)    
Disclosure of fair value measurement of assets    
Derivative financial assets, fair value   2,226,138
Level 1 | Financial assets measured at fair value through other comprehensive income (Note 18)    
Disclosure of fair value measurement of assets    
Derivative financial assets, fair value   319,949
Level 2    
Disclosure of fair value measurement of assets    
Derivative financial assets 40,356 38,008
Level 2 | Financial assets held at FVPL    
Disclosure of fair value measurement of assets    
Derivative financial assets, fair value ¥ 455,016 925,204
Level 3 | Financial assets measured at fair value through other comprehensive income (Note 18)    
Disclosure of fair value measurement of assets    
Derivative financial assets, fair value   ¥ 1,906,189