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Property and equipment, net (Details)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Property, Plant and Equipment [Line Items]      
Sub total $ 190,475 ¥ 1,369,212 ¥ 1,649,663
Less: accumulated depreciation (128,518) (923,842) (899,711)
Total 61,957 445,370 749,952
Office Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Sub total 2,845 20,448 37,520
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Sub total 20,493 147,312 139,119
Vehicles [Member]      
Property, Plant and Equipment [Line Items]      
Sub total 167,137 1,201,452 1,201,452
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Sub total ¥ 271,572