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Income taxes - Net operating loss carryforwards (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Other than PRC |  |
Net operating loss carryforwards |  |
Total | ¥ 587,802 | ¥ 302,595
PRC |  |
Net operating loss carryforwards |  |
2025 | 749 |
2026 | 48,014 |
2027 | 153,335 |
2028 | 64,772 |
2029 | 24,779 |
2031 | 668 |
2032 | 748,254 |
2033 | 484,707 |
2034 | 914,428 |
Total | ¥ 2,439,706 |

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