Summary of significant accounting policies - Schedule of sales and marketing expenses (Details) - Accounts payable - Customer concentration risk |
12 Months Ended | ||
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Dec. 31, 2025
CNY (¥)
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Dec. 31, 2025
USD ($)
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Dec. 31, 2024
CNY (¥)
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| Customer A | |||
| Concentration of risk, accounts receivable, net | |||
| Company percentage | 14.00% | ||
| Company | ¥ 6,930,689 | ||
| Customer B | |||
| Concentration of risk, accounts receivable, net | |||
| Company percentage | 16.00% | 16.00% | |
| Company | ¥ 12,672,979 | $ 1,812,212 | |
| Customer C | |||
| Concentration of risk, accounts receivable, net | |||
| Company percentage | 13.00% | ||
| Company | ¥ 6,273,190 | ||
| Customer D | |||
| Concentration of risk, accounts receivable, net | |||
| Company percentage | 17.00% | 17.00% | |
| Company | ¥ 12,889,482 | $ 1,843,171 | |
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- Definition Concentration risk amount. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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