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Long-term investments (Details)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Schedule of Investments [Line Items]      
Subtotal $ 166,936 ¥ 1,200,000 ¥ 1,200,000
Less: Impairment loss 153,433 1,102,938 1,102,938
Total 13,503 97,062 97,062
Investment 1 [Member]      
Schedule of Investments [Line Items]      
Subtotal 83,468 600,000 600,000
Investment 2 [Member]      
Schedule of Investments [Line Items]      
Subtotal $ 83,468 ¥ 600,000 ¥ 600,000