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Operations - Initial public offering ("IPO") and followed offerings (Details)
$ / shares in Units, ¥ in Thousands
 1 Months Ended 12 Months Ended
Oct. 03, 2022
Jan. 31, 2023
CNY (¥)
shares
Jan. 31, 2023
USD ($)
shares
Dec. 31, 2023
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
USD ($)
Jan. 31, 2023
USD ($)
$ / shares
Nov. 30, 2021
USD ($)
Operations and Reorganization [Line Items]                
Net proceeds from the offering, after deducting offerings expenses       ¥ 2,689,380        
Convertible senior notes aggregate principal amount       652 ¥ 95,692      
Convertible senior notes due December 2026 [Member]                
Operations and Reorganization [Line Items]                
Convertible senior notes aggregate principal amount   ¥ 2,600,000   3,062,600 ¥ 95,600   $ 384,800,000 $ 1,600,000,000
Percentage of convertible notes   0.50%         0.50%  
Hong Kong Stock Exchange [Member]                
Operations and Reorganization [Line Items]                
Date of conversion of the company from the secondary listing series to primary listing Oct. 03, 2022              
ADSs                
Operations and Reorganization [Line Items]                
Ordinary shares, issued (in shares) | shares   15,344,000 15,344,000          
Price per share | $ / shares             $ 26.65  
Net proceeds from the offering, after deducting offerings expenses   ¥ 2,689,400 $ 396,900,000          
ADSs | Convertible senior notes due December 2026 [Member]                
Operations and Reorganization [Line Items]                
Convertible senior notes aggregate principal amount | $               $ 1,000
Debt instrument repurchased amount   ¥ 2,200,000   ¥ 2,200,000   $ 331,200,000 $ 331,200,000