Fair value measurements - Additional Information (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair value measurements
Credit impairment related to available-for-sale debt investments		¥ 66,339	¥ 14,987
Credit loss related to available-for-sale debt investments	¥ 76,458	1,079
Non-credit losses	(43,569)	(79,119)	20,824
Gain on fair value changes of investment	0	0
Impairment loss of investments	43,698	166,127	¥ 210,813
Fair Value, Inputs, Level 3 \| Impaired Investments
Fair value measurements
Equity securities without readily determinable fair value	¥ 33,541	¥ 15,438

Amount of expense for credit impairment on available-for-sale debt investments.

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Amount of credit loss recognized on investment in debt security in net loss.

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Amount of non-credit losses on available-for-sale debt investments, which was reported in other comprehensive income (loss).

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Amount of investment in equity security without readily determinable fair value.

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Amount of impairment loss on investment in equity security without readily determinable fair value.

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

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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