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Related party transactions and balances (Details Narrative) - Parent [Member]
12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Related Party Transaction [Line Items]      
Proceeds from related party debt   ¥ 0 ¥ 233,750,413
Repayment of related party debt $ 2,417,647 ¥ 17,379,014 ¥ 184,185,614