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v3.25.2

Accounts receivable and allowance for credit losses (Details) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥)
--- | --- | --- | ---
Credit Loss [Abstract] |  |  |
Accounts receivable | $ 3,285,340 | ¥ 23,518,435 | ¥ 23,714,517
Less: allowance for credit losses |  |  |
Accounts receivable, net | $ 3,285,340 | ¥ 23,518,435 | ¥ 23,714,517

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