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Organization and principal activities - Schedule of Condensed Consolidated Statements Data for the VIEs (Parenthetical) (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
VIEs      
Investments in and Advances to Affiliates      
Outstanding balances for Variable Interest Entity fees Charged ¥ 0 ¥ 0  
Service fees receivable from variable interest entity set off against intercompany receivables 0 212,000 ¥ 139,000
Wholly foreign-owned enterprise And Other Subsidiaries      
Investments in and Advances to Affiliates      
Variable interest entity service fees charged amount 4,783,000 4,622,000 5,530,000
Payment of Variable Interest Entity Service Fees ¥ 4,783,000 ¥ 4,410,000 ¥ 5,391,000