v3.26.1
Long-term investments (Details Narrative)
Jun. 30, 2026
USD ($)
Jun. 30, 2026
CNY (¥)
Dec. 31, 2025
CNY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Cost method investments $ 14,229 ¥ 96,911 ¥ 96,911
Investment 1 [Member]      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Impairment allowance 78,430 534,181  
Investment 2 [Member]      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Impairment allowance $ 83,529 ¥ 568,908