v3.26.1
Financial investments - Summary of investments in VC funds in the form of partnership measured at fair value (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Financial investments        
Opening balance ¥ 35,224,215 $ 5,036,996 ¥ 17,227,629  
Switch in 0 0 374,471  
Redemption 834,425 119,321 0  
Fair value adjustment (21,052,326) (3,010,443) 17,133,677 ¥ 6,497,518
Exchange differences (420,226) (60,092) 488,438  
Ending Balance ¥ 12,917,238 $ 1,847,140 ¥ 35,224,215 ¥ 17,227,629