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Short-term borrowings (Details)
¥ in Thousands, $ in Thousands
1 Months Ended
Nov. 30, 2019
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Term and revolving facility agreement        
Short and Long-term borrowings        
Line of credit, maximum capacity ¥ 1,200,000      
Debt instrument term 8 years      
Carrying amount of collateral     ¥ 95,650 $ 13,870
Spread on variable rate 0.295%      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember      
Hong Kong Branch of Zheshang Bank        
Short and Long-term borrowings        
Contract to company borrows   ¥ 720,000    
Debt interest rate   4.40%