Fair value measurement of financial instruments - Disclosure of recurring fair value measurements of the fair value hierarchy (Details) - CNY (¥) ¥ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Disclosure Of reconciliation Of Financial Assets recurring fair value measurements [Line Items]
Purchase	¥ 37,281	¥ 1,829
Sell	(1,714)	(318,416)
Included in earnings	(23,154)	(4,503)
Level 2 of fair value hierarchy [member] \| Recurring fair value measurement [member]
Disclosure Of reconciliation Of Financial Assets recurring fair value measurements [Line Items]
Beginning balance	1,735,333	¥ 1,685,146	¥ 1,685,146
Purchase			20,001
Sell			(1,714)
Included in earnings			39,021
Foreign exchange effect			(7,121)
Ending balance			¥ 1,735,333
Level 3 of fair value hierarchy [member] \| Recurring fair value measurement [member]
Disclosure Of reconciliation Of Financial Assets recurring fair value measurements [Line Items]
Purchase	17,280
Ending balance	¥ 17,280

The increase (decrease) in the fair value of a financial asset (or group of financial assets) designated as measured at fair value through profit or loss that is attributable to changes in the credit risk of that asset determined either: (a) as the amount of change in its fair value that is not attributable to changes in market conditions that give rise to market risk ; or (b) using an alternative method the entity believes more faithfully represents the amount of change in its fair value that is attributable to changes in the credit risk of the asset. [Refer: Credit risk [member]; Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 9
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_9_c&doctype=Standard
-URIDate 2024-03-27

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- Definition

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 cash inflow from sales or maturity of financial assets measured at fair value through profit or loss, classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard
-URIDate 2024-03-27

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- Definition

The cash outflow for the purchase of financial assets measured at fair value through profit or loss, classified as investing activities.

+ References

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- References

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- Definition

Foreign exchange effect Of financial assets measured at fair value through profit or loss.

+ References

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