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Market risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Statement [Line Items]    
Convertible notes payable ¥ 5,393 ¥ 12,922
Market risk [member]    
Statement [Line Items]    
Loan payable 0 0
Convertible notes payable ¥ 5,393 ¥ 12,922