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Intangible assets - Key assumptions used to calculate value of goodwill (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Intangible assets    
Long term growth rate 2.00% 2.00%
Pre-tax discount rate 21.54% 19.73%
CGU Technology Solution    
Intangible assets    
Recoverable amount of the group of CGUs exceeding/(below) its carrying amount ¥ (189,518) ¥ 1,153,821
Minimum    
Intangible assets    
Revenue growth rate (25.00%) (10.00%)
Profit margin (2.00%) (2.00%)
Maximum    
Intangible assets    
Revenue growth rate 10.00% 13.00%
Profit margin 8.00% 14.00%