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Income tax expense (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement [Line Items]      
Loss before income taxes ¥ (7,305) ¥ (500,370) ¥ (395,803)
Income tax expense 731 1,711 0
Income Taxes [Member]      
Statement [Line Items]      
Loss before income taxes (7,305) (500,370) (395,803)
Computed expected income tax expense (1,827) (125,550) (98,951)
Tax effect of non-deductible expenses 0 124,383 109,650
Tax effect of tax-exempt entities 2,558 2,938 (2,580)
Tax effect of non-taxable income 0 0 (8,119)
Income tax expense ¥ 731 ¥ 1,711 ¥ 0