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Segment information and revenue - Remaining performance obligations of long-term contracts (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment information and revenue      
Aggregate amount of the transaction price allocated to longterm contracts that are partially or fully unsatisfied at the end of each year ¥ 666,684 ¥ 551,775 ¥ 1,051,690
Expected to be recognized within one year      
Segment information and revenue      
Aggregate amount of the transaction price allocated to longterm contracts that are partially or fully unsatisfied at the end of each year 428,055 386,278 670,991
Expected to be recognized in one to two years      
Segment information and revenue      
Aggregate amount of the transaction price allocated to longterm contracts that are partially or fully unsatisfied at the end of each year 120,256 112,605 237,126
Expected to be recognized in two to three years      
Segment information and revenue      
Aggregate amount of the transaction price allocated to longterm contracts that are partially or fully unsatisfied at the end of each year 52,698 38,900 99,208
Expected to be recognized beyond three years      
Segment information and revenue      
Aggregate amount of the transaction price allocated to longterm contracts that are partially or fully unsatisfied at the end of each year ¥ 65,675 ¥ 13,992 ¥ 44,365