v3.26.1
Summary of significant accounting policies - Schedule of fair value and the non-recurring losses due to impairment of the related assets (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair value and the non-recurring losses      
Intangible assets, net - agency contract rights - Impairment loss   ¥ 61,679,245 ¥ 13,966,789
Equity method investments impairment loss ¥ 0 7,085,156 ¥ 29,123,511
Nonrecurring | Fair Value Measurements at Reporting Date Using Significant Unobservable Inputs (Level 3)      
Fair value and the non-recurring losses      
Intangible assets, net - agency contract rights - Impairment loss   61,679,245  
Other non-current assets - prepayments - Impairment loss   13,793,447  
Equity investments without readily determinable fair value impairment loss 2,114,370 19,689,373  
Total ¥ 2,114,370 102,247,221  
Equity method investments impairment loss   ¥ 7,085,156