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 | ||