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Segment information and revenue - Revenue recognized in relation to contract liabilities (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment information and revenue      
Revenue recognized that was included in the contract liability balance at the beginning of the year ¥ 138,563 ¥ 166,650 ¥ 153,844