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Summary of accounting policy information - Derivative financial instruments and Leases (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Leases  
Derivative financial instruments ¥ 0
Minimum  
Leases  
Typical term of rental contracts (in years) 1 year
Maximum  
Leases  
Typical term of rental contracts (in years) 5 years