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Segment information and revenue - Segments and Principal activities (Details)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
segment
Dec. 31, 2022
CNY (¥)
segment
Segments and principal activities      
Number of reportable segments | segment   2 2
Revenue ¥ 2,248,103 ¥ 3,521,591 ¥ 4,357,462
Cost of revenue (1,443,606) (2,195,574) (2,775,354)
Gross profit 804,497 1,326,017 1,582,108
Research and development expenses (510,898) (955,201) (1,399,415)
Selling and marketing expenses (177,285) (241,612) (369,948)
General and administrative expenses (305,110) (375,128) (710,165)
Net impairment losses on financial and contract assets (31,255) (40,544) (23,023)
Other income, gains or loss-net (83,482) 69,183 71,362
Operating loss (303,533) (217,285) (849,081)
Finance income 67,484 29,580 14,709
Finance costs (13,289) (20,086) (36,819)
Finance (costs)/income - net 54,195 9,494 (22,110)
Share of gains of associate and joint venture - net   4,607 24,852
Loss before income tax (249,338) (210,341) (857,337)
Accounting profit (39,839) (361,714) (990,173)
ASSETS      
Deferred tax assets 313,805 768,276 765,959
Total assets 3,967,252 8,068,358  
LIABILITIES      
Deferred tax liabilities   2,079 5,196
Total liabilities 1,463,309 5,120,566  
Other segment information      
Depreciation of property and equipment 51,889 68,729 106,118
Amortization of intangible assets 53,997 126,433  
Technology Solutions      
Segments and principal activities      
Revenue 2,248,103 3,521,591 4,357,462
Cost of revenue (1,443,606) (2,195,574) (2,775,354)
Gross profit 804,497 1,326,017 1,582,108
Operating loss (303,533) (217,285) (849,081)
Loss before income tax (249,338) (210,341) (857,337)
ASSETS      
Segment Assets 3,496,187 4,016,149 4,975,377
Goodwill 157,260 289,161 289,161
Deferred tax assets 313,805 768,276 765,959
Total assets 3,967,252 5,073,586 6,030,497
LIABILITIES      
Segment Liabilities 1,463,309 2,754,711 3,521,233
Deferred tax liabilities   2,079 5,196
Total liabilities 1,463,309 2,756,790 3,526,429
Other segment information      
Depreciation of property and equipment 51,889 68,729 106,118
Amortization of intangible assets ¥ 47,742 ¥ 91,746 ¥ 135,212