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Earnings(loss) per share (Details) - CNY (¥)
¥ / shares in Units, ¥ in Thousands, shares in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings(loss) per share      
Net loss attributable to the equity holders of the Company - numerator for basic and diluted loss per share ¥ (502,081) ¥ (316,642) ¥ (24,275)
Weighted average share outstanding - denominator for basic and diluted loss per share 12,745,070 2,109,776 1,003,304
Basic and diluted loss per share ¥ (0.04) ¥ (0.15) ¥ (0.02)