Summary of significant accounting policies (Details 4) |
Jun. 30, 2026
USD ($)
|
Jun. 30, 2026
CNY (¥)
|
Dec. 31, 2025
CNY (¥)
|
|---|---|---|---|
| Total | $ 5,419,902 | ¥ 36,914,408 | ¥ 31,242,467 |
| Shanghai Weimu [Member] | |||
| Total | 438,903 | 2,989,323 | 2,512,517 |
| Viwo Cayman [Member] | |||
| Total | $ 4,980,999 | ¥ 33,925,085 | ¥ 28,729,950 |