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Related party transactions - Schedule of Allowance for Credit Loss Provision Related to Amounts Due from Related Parties (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Expected Credit Loss Provision Related To Amounts Due From to Related Parties [Abstract]      
Balance at beginning of the year ¥ (302) ¥ (217) ¥ (302)
Current year provision (67) (100) (219)
Current year reversal 111 15 304
Balance at end of the year ¥ (258) ¥ (302) ¥ (217)