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Organization and principal activities (Details 2) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement [Line Items]      
Net loss ¥ (8,036) ¥ (502,081) ¥ (395,803)
VIEs [Member]      
Statement [Line Items]      
Interest income on loans 0 0 11,218
Net loss ¥ 0 ¥ 0 ¥ (385,041)