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Mezzanine equity (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2024
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning, Total ¥ 4,532,907  
Subscription contributions from shareholders 159,485  
Accretion of Redeemable Convertible Preferred Shares 354,878  
Foreign currency translation adjustment 445,479  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (5,492,749)  
Balance as of ending, Total ¥ 0  
Competent directors vote   67.00%
Series Angel Preferred Shares    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning (in shares) 6,016,207  
Balance as of beginning, Carrying amount ¥ 283,585  
Accretion of Redeemable Convertible Preferred Shares 21,916  
Foreign currency translation adjustment ¥ 26,949  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) (6,016,207)  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO ¥ (332,450)  
Balance as of ending (in shares) 0  
Balance as of ending, Carrying amount ¥ 0  
Series A Preferred Shares    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning (in shares) 29,184,844  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) (29,184,844)  
Balance as of ending (in shares) 0  
Series A Preferred Shares | Carrying amount    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning, Carrying amount ¥ 1,429,313  
Accretion of Redeemable Convertible Preferred Shares 100,884  
Foreign currency translation adjustment 135,409  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (1,665,606)  
Balance as of ending, Carrying amount 0  
Series A Preferred Shares | Subscription receivable    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning, Subscription receivable 0  
Balance as of ending, Subscription receivable ¥ 0  
Series A+ Preferred Shares    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning (in shares) 29,361,157  
Balance as of beginning, Carrying amount ¥ 1,386,671  
Accretion of Redeemable Convertible Preferred Shares 106,959  
Foreign currency translation adjustment ¥ 131,767  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) (29,361,157)  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO ¥ (1,625,397)  
Balance as of ending (in shares) 0  
Balance as of ending, Carrying amount ¥ 0  
Series A++ Preferred Shares    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning (in shares) 8,546,916  
Balance as of beginning, Carrying amount ¥ 475,413  
Accretion of Redeemable Convertible Preferred Shares 36,732  
Foreign currency translation adjustment ¥ 45,179  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) (8,546,916)  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO ¥ (557,324)  
Balance as of ending (in shares) 0  
Balance as of ending, Carrying amount ¥ 0  
Series B Preferred Shares    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning (in shares) 17,615,165  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (in shares) (17,615,165)  
Balance as of ending (in shares) 0  
Series B Preferred Shares | Carrying amount    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning, Carrying amount ¥ 1,117,317  
Accretion of Redeemable Convertible Preferred Shares 88,387  
Foreign currency translation adjustment 106,268  
Conversion of Preferred Shares to Ordinary Shares upon the completion of the IPO (1,311,972)  
Balance as of ending, Carrying amount 0  
Series B Preferred Shares | Subscription receivable    
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance as of beginning, Subscription receivable (159,392)  
Subscription contributions from shareholders 159,485  
Foreign currency translation adjustment (93)  
Balance as of ending, Subscription receivable ¥ 0