Financial risk management - Schedule of Fair Value of Financial Instruments (Details) - Recurring fair value measurements [Member] - CNY (¥) ¥ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financial risk management
Financial assets at fair value through profit or loss	¥ 3,205	¥ 104,952
Financial assets at fair value through other comprehensive income	195,789	104,970
Convertible bonds	241,524	272,684
Level 1 [Member]
Financial risk management
Financial assets at fair value through profit or loss	0	0
Financial assets at fair value through other comprehensive income	66,642	104,970
Convertible bonds	0	0
Level 3 [Member]
Financial risk management
Financial assets at fair value through profit or loss	3,205	104,952
Financial assets at fair value through other comprehensive income	129,147	0
Convertible bonds	¥ 241,524	¥ 272,684

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]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 8
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_a&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 44
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_a&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 44
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_a&doctype=Standard
-URIDate 2025-03-27

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