Related party transactions (Details) - Newlink Technology Limited [Member] - CNY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Related party transactions (Details) [Line Items] | ||
| Related party transaction as payroll and non-payroll labor expenses | ¥ 24.9 | ¥ 65.2 |
| Related party transaction as rental fees | 7.3 | 42.6 |
| Related party transaction as other expenses | 2.5 | 3.2 |
| Payments made by related party on behalf of entity | 15.1 | 19.4 |
| Additional Paid-in Capital [Member] | ||
| Related party transactions (Details) [Line Items] | ||
| Share-based compensation from controlling shareholder ESOP | ¥ 0.8 | ¥ 5.3 |