Statutory reserves and restricted net assets (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2025
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
CNY (¥)
|
|
| Statutory reserves and restricted net assets | |||
| Minimum percentage of after tax profit to be allocated to statutory reserve | 10.00% | ||
| Required statutory reserve registered capital ratio to deforce compulsory net profit allocation to statutory reserve | 50.00% | ||
| Amounts restricted that include paid in capital, additional paid-in capital and statutory reserve funds, as determined pursuant to PRC GAAP | ¥ 5,046,425,864 | $ 721,629,301 | ¥ 4,816,033,362 |