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Income tax - Deferred tax (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income tax        
Net operating losses carried forward ¥ 551,813 ¥ 442,384 ¥ 308,981  
Accruals and others 23,606 84,261 67,952  
Less: valuation allowance ¥ (575,419) ¥ (526,645) ¥ (376,933) ¥ (159,820)