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Accounts receivable, net - Credit loss provision (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accounts receivable, net      
Balance at beginning of the year ¥ (9,684) ¥ (15,717) ¥ (2,303)
Current year provision (3,874) (6,501) (13,888)
Current year reversal 1,168 12,534 474
Balance at end of the year ¥ (12,390) ¥ (9,684) ¥ (15,717)