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Intangible assets - Amortization (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Intangible assets      
Amortization of intangible assets ¥ 47,742,000 ¥ 91,746,000 ¥ 135,212,000
Amortization 53,997,000 126,433,000  
Impairment charge on intangible assets 2,392,000 5,851,000 10,208,000
Goodwill 131,901,000    
Impairment loss of intangible assets 134,293,000 5,851,000 10,208,000
Discontinued operations      
Intangible assets      
Amortization 6,255,000 34,687,000 26,909,000
Continuing and Discontinued operations      
Intangible assets      
Amortization of intangible assets 53,997,000 126,433,000  
Amortization     162,121,000
Impairment loss of intangible assets 134,293,000 5,851,000  
Technology Solutions      
Intangible assets      
Amortization 47,742,000 91,746,000 135,212,000
Goodwill      
Intangible assets      
Impairment loss of intangible assets 131,901,000    
Goodwill | Continuing and Discontinued operations      
Intangible assets      
Impairment loss of intangible assets 131,901,000    
Goodwill | Technology Solutions      
Intangible assets      
Goodwill 189,518,000    
Cost of revenue      
Intangible assets      
Amortization of intangible assets 47,028,000 84,081,000 119,819,000
Research and development expenses      
Intangible assets      
Amortization of intangible assets 232,000 4,437,000 6,282,000
General and administrative expenses      
Intangible assets      
Amortization of intangible assets ¥ 482,000 ¥ 3,228,000 ¥ 9,111,000