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Related party transactions and balances (Details)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
[custom:AmountDueToParent-0]			¥ 17,379,013
Joyous Dragon [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
[custom:DueToRelatedParty-0]			¥ 1,086,012

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- References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

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