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General information and basis of presentation - Schedule of financial statements amounts and balances of the Group's VIEs and subsidiaries of VIEs (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
General information, recapitalization and basis of presentation.      
Total current assets ¥ 3,397,304 ¥ 5,358,968  
Total non-current assets 569,948 2,709,390  
Total assets 3,967,252 8,068,358  
Total current liabilities 1,439,693 5,073,078  
Total non-current liabilities 23,616 47,488  
Total liabilities 1,463,309 5,120,566  
Total revenue 2,248,103 3,521,591 ¥ 4,357,462
Net loss (495,207) (371,476) (928,026)
Net cash used in operating activities (276,849) (648,461) (745,984)
Net cash generated from investing activities 1,106,256 318,634 1,873,169
Net cash generated from/ (used in) financing activities (282,252) (213,605) (694,066)
Net increase/(decrease) in cash and cash equivalents 547,155 (543,432) 433,119
Cash and cash equivalents at the beginning of the year 1,379,473 1,907,776 1,399,370
Cash and cash equivalents at the end of year ¥ 1,947,922 1,379,473 1,907,776
Shenzhen CA      
General information, recapitalization and basis of presentation.      
Proportion of ownership interest in subsidiary 98.90%    
VIEs      
General information, recapitalization and basis of presentation.      
Registered capital, capital reserve and PRC statutory reserves ¥ 1,786,000 1,782,000  
Total current assets 1,938,718 3,058,529  
Total non-current assets 377,103 603,914  
Total assets 2,315,821 3,662,443  
Total current liabilities 5,608,821 6,676,641  
Total non-current liabilities 18,283 24,291  
Total liabilities 5,627,104 6,700,932  
Total revenue 2,058,979 3,261,285 4,064,707
Net loss (271,927) (68,079) (195,819)
Net cash used in operating activities (91,370) (149,778) (618,574)
Net cash generated from investing activities 313,138 75,598 918,498
Net cash generated from/ (used in) financing activities (352,204) (508,121) 368,778
Net increase/(decrease) in cash and cash equivalents (130,436) (582,301) 668,702
Cash and cash equivalents at the beginning of the year 323,951 906,252 237,550
Cash and cash equivalents at the end of year ¥ 193,515 ¥ 323,951 ¥ 906,252
VIEs | Shenzhen CA      
General information, recapitalization and basis of presentation.      
Proportion of ownership interest in subsidiary 98.90% 98.90%