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Cost of delivery services income and other revenues - Summary of Cost of Other Revenues (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Cost of delivery services income and other revenues        
Delivery cost ¥ 200,004,561 $ 27,400,512 ¥ 131,685,885  
Other costs     711,777 ¥ 56,202,270
Total cost of delivery services income and other revenues ¥ 200,004,561 $ 27,400,512 ¥ 132,397,662 ¥ 56,202,270