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Taxation - Deferred tax assets and liabilities (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:      
Deferred revenue ¥ 473,200 ¥ 143,688  
Accrued expenses and other payables 112,780 150,092  
Advertising expenses in excess of deduction limit 284,205 130,720  
Net operating tax loss carry forwards 2,684,042 1,662,884  
Others 146,831 71,048  
Total deferred tax assets 3,701,058 2,158,432  
Less: valuation allowance (3,657,467) (2,122,077) ¥ (977,333)
Net deferred tax assets 43,591 36,355  
Deferred tax liabilities      
Acquired intangible assets (Note 25) (110,923) (82,191)  
Total deferred tax liabilities (110,923) (82,191)  
Movement of the aggregate valuation allowances for deferred tax assets      
Balance at January 1 (2,122,077) (977,333) (537,359)
Re-measurement due to applicable preferential tax rate     105
Addition (1,543,301) (1,154,342) (484,445)
Expiration of loss carry forward and impact of disposal of subsidiaries 7,911 9,598 44,366
Balance at December 31 ¥ (3,657,467) ¥ (2,122,077) ¥ (977,333)