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Accounts Receivable, net - Allowance for doubtful accounts (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Movements in the allowance for doubtful accounts      
Balance at beginning of the year ¥ (77,723) ¥ (83,383) ¥ (122,039)
Reversal/(additional) of allowance for credit losses, net (32,471) (28,098) 30,192
Write-offs 2,994 33,758 8,464
Balance at end of the year (107,200) ¥ (77,723) ¥ (83,383)
Collection of receivables ¥ 33,300