Financial risk management - Schedule of Fair Value of Financial Instruments (Details) - Recurring fair value measurements [Member] - CNY (¥) ¥ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financial risk management
Financial assets at fair value through profit or loss	¥ 1,291	¥ 132,352
Financial assets at fair value through other comprehensive income	92,396	66,642
Financial liabilities at fair value through profit or loss	22,044	241,524
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	92,396	66,642
Financial liabilities at fair value through profit or loss	0	0
Level 2 [Member]
Financial risk management
Financial assets at fair value through profit or loss	0	0
Financial assets at fair value through other comprehensive income	0	0
Financial liabilities at fair value through profit or loss	0	0
Level 3 [Member]
Financial risk management
Financial assets at fair value through profit or loss	1,291	132,352
Financial assets at fair value through other comprehensive income	0	0
Financial liabilities at fair value through profit or loss	¥ 22,044	¥ 241,524

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