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Fair value measurements - Summary of Financial Instruments Measured or Disclosed at Fair Value on Recurring Basis (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Assets
Available-for-sale debt investments	¥ 163,027	¥ 283,054
Recurring
Assets
Available-for-sale debt investments	163,027	283,054
Level 3 | Recurring
Assets
Available-for-sale debt investments	¥ 163,027	¥ 283,054

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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