Financial risk management - Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Assets (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Financial risk management
Fair values	¥ 3,205	¥ 104,952
Expected Volatility Measurement Input \| Investments in unlisted company
Financial risk management
Description	Investments in unlisted company
Unobservable inputs	Expected volatility
Change of inputs	26.00%	26.00%
Relationship of unobservable inputs to fair value	The higher the expected volatility, the lower the fair value
Expected Volatility Measurement Input \| Convertible Notes
Financial risk management
Description	Convertible bonds
Unobservable inputs	Expected volatility
Relationship of unobservable inputs to fair value	The higher the expected volatility, the lower the fair value
Expected Volatility Measurement Input \| Level 3 \| Investments in unlisted company
Financial risk management
Fair values	¥ 3,160	¥ 7,895
Expected Volatility Measurement Input \| Level 3 \| Convertible Notes
Financial risk management
Fair values	¥ 241,524	¥ 272,684
Discount For Lack Of Marketability
Financial risk management
Unobservable inputs	Discount for lack of marketability (“DLOM”)
Relationship of unobservable inputs to fair value	The higher the DLOM, the lower the fair value
Discount For Lack Of Marketability \| Investments in unlisted company
Financial risk management
Change of inputs	3.00%	3.00%

The description of the interrelationships between unobservable inputs and of how they might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurement of assets. [Refer: Disclosure of significant unobservable inputs used in fair value measurement of assets [text block]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2024-01-01
-Paragraph 93
-Subparagraph h
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_i&doctype=Standard
-URIDate 2024-03-27

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The description of the sensitivity of the fair value measurement of assets to changes in unobservable inputs if a change to those inputs might result in a higher or lower fair value measurement.

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 8
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_a&doctype=Standard
-URIDate 2024-03-27

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- Definition

The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 13
-IssueDate 2024-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
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-URIDate 2024-03-27

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Significant unobservable inputs description.

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