v3.26.1
Property and equipment, net - Additional information (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Property and equipment, net        
Depreciation expense ¥ 1,916,747 $ 274,091 ¥ 6,285,907 ¥ 6,014,868