Summary of significant accounting policies - Variable interest entity (Details) - Beijing WFOE	12 Months Ended
Dec. 31, 2025
Shareholders' Voting Rights Proxy Agreement
Significant accounting policies
Power of attorney, term	10 years
Notice period for termination of agreement	30 days
Power of attorney, renewal period	1 year
Executive Call Option Agreement
Significant accounting policies
Term of agreement	10 years
Extended term of agreement	10 years
Exclusive Business Cooperation Agreements
Significant accounting policies
Term of agreement	10 years
Extended term of agreement	10 years
Percentage of consolidated profit, base for fees on technical support and consulting services	100.00%

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/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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- Definition

The extended term of agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The notice period for termination of contractual agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The percentage of consolidated profit is base for fees on exclusive technical support and consulting services.

+ References

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- Definition

The automatic renewable period of power of attorney after expiration, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The term of power of attorney, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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The term of agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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