Property and equipment, net (Details Narrative)	6 Months Ended	12 Months Ended
Jun. 30, 2026 USD ($)	Jun. 30, 2026 CNY (¥)	Jun. 30, 2025 CNY (¥)	Dec. 31, 2025 CNY (¥)
Property, Plant, and Equipment [Abstract]
Depreciation expense	$ 5,741	¥ 39,099		¥ 164,749
Loss on disposal of property and equipment	$ 1,655	¥ 11,274

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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Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration