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Related party transactions and balances (Details)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
[custom:AmountDueToParent-0] ¥ 17,379,013
Joyous Dragon [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
[custom:DueToRelatedParty-0] ¥ 1,086,012