v3.26.1
Summary of significant accounting policies - Guarantee liabilities and Financial guarantee derivative (Details)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Summary of significant accounting policies      
Contingent guarantee liabilities ¥ 748,306,610 $ 107,006,422 ¥ 187,640,702