Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Property and equipment, net (Details)	6 Months Ended
Property and equipment, net (Details)	Jun. 30, 2026 CNY (¥)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2026 USD ($)	Dec. 31, 2025 CNY (¥)
Property and equipment, net
Subtotal	¥ 5,809,516			$ 856,218	¥ 5,711,319
Less: accumulated depreciation	(2,263,896)			(333,658)	(1,454,437)
Property and equipment, net	3,545,620			522,560	4,256,882
Depreciation expenses	875,959	$ 129,100	¥ 156,110
Motor vehicle
Property and equipment, net
Subtotal	496,185			73,129	496,185
Office equipment
Property and equipment, net
Subtotal	1,068,308			157,450	1,133,534
Leasehold improvement
Property and equipment, net
Subtotal	¥ 4,245,023			$ 625,639	¥ 4,081,600