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Organization and principal activities (Details 2) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement [Line Items]      
Net loss ¥ (502,081) ¥ (395,803) ¥ (30,344)
VIEs [Member]      
Statement [Line Items]      
Interest Income On Loans 0 11,218 44,797
Net loss ¥ 0 ¥ (385,041) ¥ (23,947)