Other non-current assets - Summary of other non-current assets (Details) - CNY (¥) ¥ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of other non-current assets [abstract] | ||
| Prepayment for leasing motor vehicles | ¥ 11,942 | ¥ 18,239 |
| Prepayment for property and equipment | 8,742 | 1,225 |
| Contract assets-non-current, net of allowance | 561 | |
| Other non-current assets | ¥ 20,684 | ¥ 20,025 |