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Long-term investments - Equity investments using the measurement alternative (Details) ¥ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2024 CNY (¥) | May 31, 2022 CNY (¥) | Mar. 31, 2021 CNY (¥) item | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Long-term investments |  |  |  |  |  |
Initial cost basis |  |  |  | ¥ 31,730 | ¥ 49,500 | ¥ 40,000
Upward adjustments |  |  |  | 17,446 | 18,464 | 18,464
Impairment loss |  |  |  | (44,514) |  |
Total carrying value |  |  |  | 4,662 | ¥ 67,964 | ¥ 58,464
Cash consideration | ¥ 1,500 |  |  |  |  |
Initial cost | 15,000 |  |  |  |  |
Disposed loss of equity investment | ¥ 13,500 |  |  |  |  |
Impairment of long-term investments |  |  |  | ¥ 44,500 |  |
Beijing Sharetimes Technology Co., Ltd. |  |  |  |  |  |
Long-term investments |  |  |  |  |  |
Upward adjustments |  | ¥ 18,500 |  |  |  |
Number of Investors | item |  |  | 3 |  |  |
Percentage of investment held |  |  | 1.64% |  |  |
Investments made |  |  | ¥ 30,000 |  |  |

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