Segment reporting - Groups long-term assets by geographical region (Details) - CNY (¥) ¥ in Thousands |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| China | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Total long-term assets | ¥ 5,675,293 | ¥ 5,248,201 |
| Sweden | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Total long-term assets | 656,404 | 706,906 |
| Other | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Total long-term assets | ¥ 155,562 | ¥ 139,095 |