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Related party transactions - Key management personnel compensations (Details) - Key management - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties      
Wages and salaries ¥ 22,353 ¥ 20,806 ¥ 21,123
Welfare and other benefits 1,147 654 614
Share-based payments 1,956 4,909 8,401
Total ¥ 25,456 ¥ 26,369 ¥ 30,138