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Taxation - Deferred tax assets and liabilities (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:      
Deferred revenue ¥ 265,876 ¥ 280,872  
Net operating tax loss carry forwards 3,490,177 3,542,650  
Accruals and others [1] 940,900 667,180  
Total deferred tax assets 4,696,953 4,490,702  
Less: valuation allowance (4,561,822) (4,444,111) ¥ (3,657,467)
Net deferred tax assets 135,131 46,591  
Deferred tax liabilities      
Acquired intangible assets (66,969) (88,547)  
Total deferred tax liabilities (66,969) (88,547)  
Movement of the aggregate valuation allowances for deferred tax assets      
Balance at January 1 (4,444,111) (3,657,467) (2,122,077)
Re-measurement due to applicable preferential tax rate for HNTE   (18,437)  
Addition (129,769) (822,414) (1,543,301)
Expiration of loss carry forward and impact of disposal/close of subsidiaries 12,058 54,207 7,911
Balance at December 31 ¥ (4,561,822) ¥ (4,444,111) ¥ (3,657,467)
[1] Accrued and others primary represent accrued expenses which are not deductible until paid under PRC laws, as well as non-deductible advertising expenses.