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Financial assets at fair value through profit or loss (Details) - CNY (¥)
Dec. 31, 2024
Dec. 31, 2023
Financial assets at fair value through profit or loss    
Carrying amount ¥ 455,016,000 ¥ 925,204,000
Wealth management products    
Financial assets at fair value through profit or loss    
Financial assets at fair value through profit or loss ¥ 260,860,000 ¥ 532,147,000