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CONVERTIBLE REDEEMABLE PREFERRED SHARES - Preferred shares activity (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Jul. 20, 2023
CNY (¥)
shares
May 14, 2021
CNY (¥)
shares
Feb. 22, 2021
CNY (¥)
shares
Dec. 25, 2020
CNY (¥)
shares
Dec. 31, 2025
CNY (¥)
shares
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2023
CNY (¥)
shares
Increase (Decrease) in Temporary Equity [Roll Forward]                
Balance at the beginning         ¥ 933,780   ¥ 871,780 ¥ 352,373
Accretion of convertible redeemable preferred shares to redemption value         20,082 $ 2,872 62,000 43,330
Conversion of redeemable preferred shares into ordinary shares upon IPO, value         (953,862)      
Balance at the end             933,780 871,780
Series A preferred stock                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Balance at the beginning         ¥ 231,944   ¥ 212,421 ¥ 194,589
Balance at the beginning (in shares) | shares         34,833,028 34,833,028 34,833,028 34,833,028
Accretion of convertible redeemable preferred shares to redemption value         ¥ 6,268   ¥ 19,523 ¥ 17,832
Issuance of Preferred Shares, net of issuance cost     ¥ 5,000 ¥ 160,000        
Issuance of Preferred Shares, net of issuance cost (in shares) | shares     1,055,546 33,777,482        
Conversion of redeemable preferred shares into ordinary shares upon IPO, value         ¥ (238,212)      
Conversion of redeemable preferred shares into ordinary shares upon IPO (in shares) | shares         (34,833,028) (34,833,028)    
Balance at the end             ¥ 231,944 ¥ 212,421
Balance at the end (in shares) | shares         0 0 34,833,028 34,833,028
Series B preferred stock                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Balance at the beginning         ¥ 234,715   ¥ 213,608 ¥ 157,784
Balance at the beginning (in shares) | shares         14,914,404 14,914,404 14,914,404 12,256,755
Accretion of convertible redeemable preferred shares to redemption value         ¥ 6,717   ¥ 21,107 ¥ 16,652
Issuance of Preferred Shares, net of issuance cost   ¥ 140,000           ¥ 39,172
Issuance of Preferred Shares, net of issuance cost (in shares) | shares   12,256,755           2,657,649
Conversion of redeemable preferred shares into ordinary shares upon IPO, value         ¥ (241,432)      
Conversion of redeemable preferred shares into ordinary shares upon IPO (in shares) | shares         (14,914,404) (14,914,404)    
Balance at the end             ¥ 234,715 ¥ 213,608
Balance at the end (in shares) | shares         0 0 14,914,404 14,914,404
Series B+ Preferred Shares                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Balance at the beginning         ¥ 467,121   ¥ 445,751  
Balance at the beginning (in shares) | shares         20,374,577 20,374,577 20,374,577  
Accretion of convertible redeemable preferred shares to redemption value         ¥ 7,097   ¥ 21,370 ¥ 8,846
Issuance of Preferred Shares, net of issuance cost ¥ 209,902             ¥ 436,905
Issuance of Preferred Shares, net of issuance cost (in shares) | shares 12,780,417             20,374,577
Conversion of redeemable preferred shares into ordinary shares upon IPO, value         ¥ (474,218)      
Conversion of redeemable preferred shares into ordinary shares upon IPO (in shares) | shares         (20,374,577) (20,374,577)    
Balance at the end             ¥ 467,121 ¥ 445,751
Balance at the end (in shares) | shares         0 0 20,374,577 20,374,577
Class A Ordinary shares                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Exchange of ordinary shares for preferred shares (in shares) | shares               1,046,761
Class A Ordinary shares | Junjie Zhang, Xianggui Peng And Peibang Gong (Employees)                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Exchange of ordinary shares for preferred shares (in shares) | shares               1,046,761
Class B Ordinary shares                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Exchange of ordinary shares for preferred shares (in shares) | shares               1,610,888
Class B Ordinary shares | Junjie Zhang, Xianggui Peng And Peibang Gong (Employees)                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Exchange of ordinary shares for preferred shares (in shares) | shares               1,610,888