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Fair value measurements - Additional Information (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Fair value measurements |  |  |
Credit impairment related to available-for-sale debt investments |  | ¥ 66,339 | ¥ 14,987
Credit loss related to available-for-sale debt investments | ¥ 76,458 | 1,079 |
Non-credit losses | (43,569) | (79,119) | 20,824
Gain on fair value changes of investment | 0 | 0 |
Impairment loss of investments | 43,698 | 166,127 | ¥ 210,813
Fair Value, Inputs, Level 3 | Impaired Investments |  |  |
Fair value measurements |  |  |
Equity securities without readily determinable fair value | ¥ 33,541 | ¥ 15,438 |

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