v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Short-term investments (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Schedule of Investments [Line Items]        
Changes in fair value of investments ¥ 5,543,812 $ 792,755 ¥ 2,358,995 ¥ 1,426,370
Short-term investments 62,661,176   0  
Short-term investments        
Schedule of Investments [Line Items]        
Changes in fair value of investments ¥ 5,543,812   ¥ 2,358,995 ¥ 1,426,370