v3.26.1
Financial risk management and fair values - Fair Value Measurements - Group's financial assets that are measured at fair value (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Jun. 30, 2023
CNY (¥)
Jun. 30, 2023
USD ($)
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Transfers from level 1 to level 2, assets ¥ 0 ¥ 0    
Transfers from level 2 to level 1, assets 0 0    
Transfers into level 3, assets 0 0    
Transfers out of level 3, assets 0 0    
Transfers from level 1 to level 2, liabilities 0 0    
Transfers from level 2 to level 1, liabilities 0 0    
Transfers into level 3, liabilities 0 0    
Other non-current financial assets 201,727,000 123,399,000    
Investment in an unlisted limited partnership enterprise        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Other non-current financial assets     ¥ 73,870,000 $ 10,409,000
Investment in an unlisted enterprise        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Other non-current financial assets     ¥ 73,870,000 $ 10,409,000
Recurring | Investment in structured deposit        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial assets   100,000,000    
Recurring | Investment in an unlisted limited partnership enterprise        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial assets 201,727,000 123,399,000    
Recurring | Financial derivative assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial assets 774,103,000      
Recurring | Redemption liabilities arising from preferred shares        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial liabilities 573,681,000      
Recurring | Financial derivative assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial liabilities 1,184,050,000      
Recurring | Level 2 | Investment in structured deposit        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial assets   100,000,000    
Recurring | Level 3 | Investment in an unlisted limited partnership enterprise        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial assets 201,727,000 ¥ 123,399,000    
Recurring | Level 3 | Financial derivative assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial assets 774,103,000      
Recurring | Level 3 | Redemption liabilities arising from preferred shares        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial liabilities 573,681,000      
Recurring | Level 3 | Financial derivative assets        
Disclosure Of Fair Value Measurement Of Assets And Liabilities        
Financial liabilities ¥ 1,184,050,000