v3.26.1
SHARE-BASED COMPENSATION - Option activity (Details) - CNY (¥)
¥ / shares in Units, ¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Number of options      
Options outstanding, Beginning 9,917,509    
Number of options granted 1,572,958    
Forfeited 582,202    
Exercised 2,344,406    
Options outstanding, Ending 8,563,859 9,917,509  
Vested and expected to vest at ending 8,563,859    
Exercisable at ending 2,637,397    
Weighted average exercise price      
At the beginning (in dollars per share) ¥ 11.52    
Granted (in dollars per share) 23.37    
Forfeited (in dollars per share) 11.87    
Exercised (in dollars per share) 15.16    
Outstanding at ending (in dollars per share) 12.71 ¥ 11.52  
Vested and expect to vest 12.71    
Weighted average exercise price 17.12    
Weighted average grant date fair value      
At the beginning 42.1    
Weighted average grant-date fair value 105.26 25.34 ¥ 55.08
Outstanding at ending 50.47 ¥ 42.1  
Vested and expected to vest at ending 50.47    
Exercisable at ending ¥ 56.17    
Weighted average remaining contract life and Aggregate intrinsic value      
Outstanding 4 years 11 months 15 days 5 years 4 months 28 days  
Vested and expect to vest (in years) 4 years 11 months 15 days    
Exercisable at ending 3 years 5 months 1 day    
Outstanding ¥ 819,816 ¥ 887,259  
Vested and expected to vest at ending 819,816    
Exercisable at ending 247,471    
Unrecognized share-based compensation expense 239,216    
Share-based compensation expenses ¥ 114,652 ¥ 116,064 ¥ 234,624
Unrecognized stock compensation expense, expected to be recognized over a weighted-average period 2 years 10 months 9 days    
Weighted average grant-date fair value ¥ 105.26 ¥ 25.34 ¥ 55.08
Options exercised ¥ 220,332 ¥ 370,257 ¥ 74,380
Share-based compensation expenses related to share options without IPO condition ¥ 106,452 ¥ 109,391 ¥ 228,312