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Taxation - Schedule of movement of valuation allowance (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Taxation      
Balance at beginning of the year ¥ 512,021 ¥ 428,709 ¥ 316,469
Additions 96,078 85,458 114,815
Reversals (654) (2,146) (2,575)
Expiration of loss carry forward and impact of close of subsidiaries (22,957)    
Balance at end of the year ¥ 584,488 ¥ 512,021 ¥ 428,709