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Management of financial risk (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Currency risk | Discount rate      
Management of financial risk      
Impact on post tax profit due to increase in foreign currency ¥ (14,099) ¥ (16,596) ¥ 1,752
Impact on post tax profit due to decrease in foreign currency ¥ 14,099 ¥ 16,596 ¥ (1,752)
Interest rate risk      
Management of financial risk      
Percentage of reasonably possible increase in risk assumption 2.00%    
Interest rate risk | HKD      
Management of financial risk      
Impact on earnings over the next 12 months if interest rates rise by 200 basis points ¥ (15,000)    
Impact on economic value if interest rates rise by 200 basis points (43,000)    
Interest rate risk | USD      
Management of financial risk      
Impact on earnings over the next 12 months if interest rates rise by 200 basis points 3,000    
Impact on economic value if interest rates rise by 200 basis points ¥ (3,000)