Summary of significant accounting policies (Details 5) |
Dec. 31, 2025
USD ($)
|
Dec. 31, 2025
CNY (¥)
|
Dec. 31, 2024
CNY (¥)
|
|---|---|---|---|
| Total | $ 4,444,922 | ¥ 31,242,467 | ¥ 17,587,961 |
| Shanghai Weimu [Member] | |||
| Total | 357,460 | 2,512,517 | 4,495,040 |
| Viwo Tech [Member] | |||
| Total | $ 4,087,462 | ¥ 28,729,950 | ¥ 13,092,921 |