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Convertible notes payable (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Convertible notes payable    
Liability component on initial recognition ¥ 12,922 ¥ 10,011
Issuance of convertible notes 7,171 9,253
Interest accrued 1,164 839
Conversion to ADS (15,972) (7,499)
Exchange difference 108 318
Total ¥ 5,393 ¥ 12,922