Related party transactions (Details) - Newlink Technology Limited [Member] - CNY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Related party transactions (Details) [Line Items] | ||
| Related party transaction as payroll and non-payroll labor expenses | ¥ 13.4 | ¥ 24.9 |
| Related party transaction as rental fees | 0.8 | 7.3 |
| Related party transaction as other expenses | 1.0 | 2.5 |
| Payments made by related party on behalf of entity | 11.6 | 15.1 |
| Additional paid-in capital [member] | ||
| Related party transactions (Details) [Line Items] | ||
| Share-based compensation from controlling shareholder ESOP | ¥ 0.7 | ¥ 0.8 |