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Long-term investments - Long-term investments (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Long-term investments      
Beginning balance ¥ 142,599 ¥ 137,357 ¥ 41,442
Investments made 4,050 9,500 38,970
Income (loss) from equity method investments (3,726) (523) 51
Partially disposal of an equity investment using the equity method   (700)  
Disposal of a subsidiary in exchange of investment accounted for at fair value     40,000
Disposal of equity investments using the measurement alternative (18,950)    
Fair value change through earnings (including adjustment of subsequent price changes) (4,811) (8,079) 15,964
Changes from a subsidiary to equity investment using the equity method 62 4,900  
Impairment loss (44,514)    
Currency translation adjustment 148 144 930
Ending balance 74,858 142,599 137,357
Equity investment using the measurement alternative      
Long-term investments      
Beginning balance 67,964 58,464 30,000
Investments made 100 9,500 10,000
Disposal of equity investments using the measurement alternative (18,950)    
Fair value change through earnings (including adjustment of subsequent price changes)     18,464
Changes from a subsidiary to equity investment using the equity method 62    
Impairment loss (44,514)    
Ending balance 4,662 67,964 58,464
Equity investment using the equity method      
Long-term investments      
Beginning balance 16,244 12,423 11,442
Investments made 3,950    
Income (loss) from equity method investments (3,726) (523) 51
Partially disposal of an equity investment using the equity method   (700)  
Changes from a subsidiary to equity investment using the equity method   4,900  
Currency translation adjustment 148 144 930
Ending balance 16,616 16,244 12,423
Investment accounted for at fair value      
Long-term investments      
Beginning balance 58,391 66,470  
Investments made     28,970
Disposal of a subsidiary in exchange of investment accounted for at fair value     40,000
Fair value change through earnings (including adjustment of subsequent price changes) (4,811) (8,079) (2,500)
Ending balance ¥ 53,580 ¥ 58,391 ¥ 66,470