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Convertible redeemable preferred shares - Preferred shares activities (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 4,138,640,113 3,746,626,700
Balance as of beginning ¥ 7,182,773 ¥ 5,041,928
Conversion of Series F convertible notes, net of cost (in shares)   392,013,413
Conversion of Series F convertible notes, net of cost   ¥ 1,631,564
Accretion on Preferred Shares to redemption value 660,070 ¥ 509,281
Amendment of series F convertible redeemable preferred share ¥ (272,426)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (4,138,640,113)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (7,570,417)  
Balance as of ending (in shares)   4,138,640,113
Balance as of ending   ¥ 7,182,773
Series A Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 58,480,000 58,480,000
Balance as of beginning ¥ 26,934 ¥ 26,703
Accretion on Preferred Shares to redemption value ¥ 223 ¥ 231
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (58,480,000)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (27,157)  
Balance as of ending (in shares) 0 58,480,000
Balance as of ending   ¥ 26,934
Series A+ Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 84,480,000 84,480,000
Balance as of beginning ¥ 40,608 ¥ 39,901
Accretion on Preferred Shares to redemption value ¥ 691 ¥ 707
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (84,480,000)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (41,299)  
Balance as of ending (in shares) 0 84,480,000
Balance as of ending   ¥ 40,608
Series B Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 734,209,000 734,209,000
Balance as of beginning ¥ 389,960 ¥ 381,310
Accretion on Preferred Shares to redemption value ¥ 8,444 ¥ 8,650
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (734,209,000)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (398,404)  
Balance as of ending (in shares) 0 734,209,000
Balance as of ending   ¥ 389,960
Series B+ Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 277,730,000 277,730,000
Balance as of beginning ¥ 240,033 ¥ 228,493
Accretion on Preferred Shares to redemption value ¥ 11,578 ¥ 11,540
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (277,730,000)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (251,611)  
Balance as of ending (in shares) 0 277,730,000
Balance as of ending   ¥ 240,033
Series C1 Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 604,820,600 604,820,600
Balance as of beginning ¥ 769,548 ¥ 702,521
Accretion on Preferred Shares to redemption value ¥ 60,431 ¥ 67,027
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (604,820,600)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (829,979)  
Balance as of ending (in shares) 0 604,820,600
Balance as of ending   ¥ 769,548
Series C2 Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 372,859,000 372,859,000
Balance as of beginning ¥ 458,503 ¥ 430,041
Accretion on Preferred Shares to redemption value ¥ 29,188 ¥ 28,462
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (372,859,000)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (487,691)  
Balance as of ending (in shares) 0 372,859,000
Balance as of ending   ¥ 458,503
Series D1 Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 705,523,600 705,523,600
Balance as of beginning ¥ 1,219,370 ¥ 1,105,823
Accretion on Preferred Shares to redemption value ¥ 120,500 ¥ 113,547
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (705,523,600)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (1,339,870)  
Balance as of ending (in shares) 0 705,523,600
Balance as of ending   ¥ 1,219,370
Series D2 Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 105,302,000 105,302,000
Balance as of beginning ¥ 179,429 ¥ 168,717
Accretion on Preferred Shares to redemption value ¥ 17,339 ¥ 10,712
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (105,302,000)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (196,768)  
Balance as of ending (in shares) 0 105,302,000
Balance as of ending   ¥ 179,429
Series E Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 803,222,500 803,222,500
Balance as of beginning ¥ 2,226,911 ¥ 1,958,419
Accretion on Preferred Shares to redemption value ¥ 224,990 ¥ 268,492
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (803,222,500)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (2,451,901)  
Balance as of ending (in shares) 0 803,222,500
Balance as of ending   ¥ 2,226,911
Series F Preferred Shares    
Convertible redeemable preferred shares    
Balance as of beginning (in shares) 392,013,413  
Balance as of beginning ¥ 1,631,477  
Conversion of Series F convertible notes, net of cost (in shares)   392,013,413
Conversion of Series F convertible notes, net of cost   ¥ 1,631,564
Accretion on Preferred Shares to redemption value 186,686 ¥ (87)
Amendment of series F convertible redeemable preferred share ¥ (272,426)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) (in shares) (392,013,413)  
Automatic conversion of preferred shares into ordinary shares upon IPO(1) ¥ (1,545,737)  
Balance as of ending (in shares) 0 392,013,413
Balance as of ending   ¥ 1,631,477