Management of financial risk - Trade receivables and contract assets (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	¥ 506,535	¥ 710,669
Financial assets	3,161,370	6,396,579
Gross carrying amount
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	582,068	779,458
Gross carrying amount \| Three-stage approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.		779,458
Contract assets.		153,204
Gross carrying amount of trade receivables and contract assets		932,662
Impairment loss allowance
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	(75,533)	(68,789)
Impairment loss allowance \| Three-stage approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.		68,789
Contract assets.		57,379
Financial assets		(126,168)
Credit risk \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Gross carrying amount of trade receivables and contract assets	707,910	¥ 932,662
Credit risk \| Gross carrying amount \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	582,068
Contract assets.	125,842
Gross carrying amount of trade receivables and contract assets	707,910
Credit risk \| Impairment loss allowance \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Financial assets	(137,955)
Trade receivable. \| Credit risk \| Impairment loss allowance \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Trade receivables.	75,533
Contract asset \| Credit risk \| Impairment loss allowance \| Simplified approach
Disclosure of nature and extent of risks arising from financial instruments
Contract assets.	¥ 62,422

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 15
-IssueDate 2024-01-01
-Paragraph 105
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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.

+ References

No definition available.

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- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 25
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount due from customers for goods and services sold.

+ References

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-Name IAS
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-Paragraph 78
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The carrying amount as of the balance sheet date of trade receivables and contract assets.

+ References

No definition available.

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