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Related party transactions - Schedule of Significant Related Party Transactions (Parenthetical) (Details) - CNY (¥)
¥ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2024
Dec. 31, 2023
Apr. 30, 2021
Dec. 31, 2024
Dec. 31, 2023
Related party transactions          
Aggregate cash consideration   ¥ 574,826      
Consideration paid ¥ 28,770 ¥ 546,084   ¥ 28,770 ¥ 546,084
Parent Company          
Related party transactions          
Related party transaction, purchases from related party     ¥ 2,013,000