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Taxation (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
Taxation |  |  |  |
Effective income tax rate | (0.80%) | (0.80%) |  |
Equity interest held | 25.00% | 25.00% |  |
Statutory income tax rate | 25.00% | 25.00% | 25.00% | 25.00%
Current income tax expense | ¥ 136,658 |  | ¥ 62,065 | ¥ 59,943
Deferred income tax expense/(benefit) | (14,776) |  | (84,880) | 200,892
Total | ¥ 121,882 | $ 17,429 | ¥ (22,815) | ¥ 260,835
US |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 29.84% | 29.84% | 29.84% | 29.84%
United Kingdom |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 19.00% | 19.00% | 19.00% | 19.00%
Germany |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 32.98% | 32.98% | 32.98% | 32.98%
Norway |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 22.00% | 22.00% | 22.00% | 22.00%
Netherlands |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 25.80% | 25.80% | 25.80% | 25.80%
Cayman Islands Tax Information Authority |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 0.00% | 0.00% |  |
State Administration of Taxation, Chinese Mainland |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 25.00% | 25.00% |  |
Preferential tax rate | 15.00% | 15.00% |  |
Percentage of withholding tax for foreign investors non resident enterprises | 10.00% | 10.00% |  |
Percentage of withholding tax for resident enterprise | 5.00% | 5.00% |  |
Percent entitled to claim for qualified research and development expenses | 200.00% | 200.00% |  |
Additional percentage of qualified research and development expenses claimed in annual filing | 100.00% | 100.00% |  |
Inland Revenue, Hong Kong | Remaining taxable income |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 16.50% | 16.50% |  |
Inland Revenue, Hong Kong | First HKD2,000 Taxable Income |  |  |  |
Taxation |  |  |  |
Effective income tax rate | 8.25% | 8.25% |  |

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