Deferred income tax - Deferred tax Offsettings (Details) - CNY (¥)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Offsetting of deferred tax assets and deferred tax liabilities
Deferred tax assets	¥ 317,361,000	¥ 792,802,000	¥ 779,395,000
Set-off of deferred tax assets (Liabilities)	(3,556,000)	(24,526,000)	(13,436,000)
Deferred tax assets	313,805,000	768,276,000	765,959,000
Deferred tax liabilities	3,556,000	26,605,000	18,632,000
Deferred tax liabilities		¥ 2,079,000	¥ 5,196,000
Reversal of deferred income tax assets	¥ 454,471,000

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

- Definition

The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

+ References

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- Definition

The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 81
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- References

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- Definition

The amount of deferred tax liabilities net of deferred tax assets, when the absolute amount of deferred tax liabilities is greater than the absolute amount of deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

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- Definition

The amount of deferred tax assets liabilities set off.

+ References

No definition available.

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- Definition

Amount of reversal of deferred tax assets.

+ References

No definition available.

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