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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