v3.26.3
Schedule of stock options activities (Details)
¥ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
$ / shares
Jun. 30, 2026
CNY (¥)
shares
Jun. 30, 2025
$ / shares
Jun. 30, 2025
CNY (¥)
shares
Dec. 31, 2025
$ / shares
Dec. 31, 2025
CNY (¥)
shares
Dec. 31, 2024
CNY (¥)
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Number of Options Outstanding, Total, Outstanding, Beginning balance [1]   56,689   40,048   40,048  
Weighted Average exercise price, Outstanding, Beginning balance | $ / shares [1] $ 4.7530   $ 6.2475   $ 6.2475    
Weighted average remaining contractual life, Outstanding, Ending balance   8 years 4 months 17 days   9 years 3 days   8 years 9 months 21 days 9 years 3 months 25 days
Aggregated intrinsic value, Outstanding, Beginning balance | ¥   ¥ 10,332   ¥ 7,990   ¥ 7,990  
Number of Options Outstanding, Total, Granted [1]   2,829   9,229      
Weighted Average exercise price, Granted | $ / shares [1] 3.5000   3.5000        
Aggregated intrinsic value, Granted | ¥          
Number of Options Outstanding, Total, Exercised     (1,452) [1]      
Number of Options Outstanding, Consultant, Exercised     1,452 [1]      
Weighted Average exercise price, Exercised | $ / shares [1]            
Aggregated intrinsic value, Exercised | ¥            
Number of Options Outstanding, Total, Forfeited [1]   (601)   (266)      
Weighted Average exercise price, Forfeited | $ / shares [1] 3.5000   3.5000        
Aggregated intrinsic value, Forfeited | ¥          
Number of Options Outstanding, Total, Outstanding, Ending balance [1]   58,917   47,559   56,689 40,048
Weighted Average exercise price, Outstanding, Ending balance | $ / shares [1] 4.7040   5.8065   $ 4.7530    
Aggregated intrinsic value, Outstanding, Ending balance | ¥   ¥ 6,364   ¥ 8,052   ¥ 10,332 ¥ 7,990
Number of Options Outstanding,Total, Exercisable, Ending balance [1]   50,250   27,752      
Weighted Average exercise price, Exercisable, Ending balance | $ / shares [1] $ 4.9140   $ 7.4550        
Weighted average remaining contractual life, Exercisable, Ending balance   8 years 5 months 12 days   8 years 11 months 1 day      
Aggregated intrinsic value, Exercisable, Ending balance | ¥   ¥ 5,461   ¥ 4,672      
Employees [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Number of Options Outstanding, Total, Outstanding, Beginning balance [1]   44,383   40,048   40,048  
Number of Options Outstanding, Total, Granted [1]   2,829   9,229      
Number of Options Outstanding, Total, Exercised [1]       (1,452)      
Number of Options Outstanding, Consultant, Exercised [1]       1,452      
Number of Options Outstanding, Total, Forfeited [1]   (601)   (266)      
Number of Options Outstanding, Total, Outstanding, Ending balance [1]   46,611   47,559   44,383 40,048
Number of Options Outstanding,Total, Exercisable, Ending balance [1]   37,944   27,752      
Consultant [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Number of Options Outstanding, Total, Outstanding, Beginning balance [1]   12,306      
Number of Options Outstanding, Total, Granted [1]          
Number of Options Outstanding, Total, Exercised [1]            
Number of Options Outstanding, Consultant, Exercised [1]            
Number of Options Outstanding, Total, Forfeited [1]          
Number of Options Outstanding, Total, Outstanding, Ending balance [1]   12,306     12,306
Number of Options Outstanding,Total, Exercisable, Ending balance [1]   12,306        
[1] The shares is presented on a retroactive basis to reflect the Company’s Share Consolidation on July 20, 2026 (Note 15).