v3.26.1
BORROWINGS - Short-term bank borrowings (Details) - CNY (¥)
¥ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2025
Nov. 30, 2024
Dec. 31, 2023
Dec. 31, 2025
Dec. 31, 2024
Nov. 30, 2025
Short-Term Debt [Line Items]            
Outstanding balance       ¥ 51,776 ¥ 148,800  
Short-Term Debt            
Short-Term Debt [Line Items]            
Unused bank facility       ¥ 848,224    
December 2023 credit facility            
Short-Term Debt [Line Items]            
Amount of credit facilities     ¥ 500,000      
Period of LPR considered     1 year      
Annual interest rate     80.00%      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     us-gaap:PrimeRateMember      
Expiration date     Dec. 12, 2024      
Amount drew drawn         ¥ 154,800  
Interest rate       2.30% 2.70%  
Repayment of credit       ¥ 148,800 ¥ 6,000  
Outstanding balance       0 ¥ 148,800  
December 2023 credit facility | Minimum            
Short-Term Debt [Line Items]            
Interest rate         2.65%  
December 2023 credit facility | Maximum            
Short-Term Debt [Line Items]            
Interest rate         2.70%  
November 2024 credit facility            
Short-Term Debt [Line Items]            
Amount of credit facilities   ¥ 500,000        
Period of LPR considered   1 year        
Annual interest rate   90.00%        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:PrimeRateMember        
Expiration date   Nov. 19, 2027        
Amount drew drawn       ¥ 26,136    
Interest rate       2.20%    
Outstanding balance       ¥ 26,136 ¥ 0  
Amount of credit facilities current           ¥ 700,000
January 2025 credit facility            
Short-Term Debt [Line Items]            
Amount of credit facilities ¥ 200,000          
Period of LPR considered 1 year          
Annual interest rate 91.00%          
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember          
Expiration date Oct. 27, 2025          
Amount drew drawn       ¥ 25,640    
Interest rate       2.19%    
Outstanding balance       ¥ 25,640