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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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