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SIGNIFICANT ACCOUNTING POLICIES - Income taxes (Details) - CNY (¥)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income taxes
Unrecognized tax benefits accrued for interest and penalties	¥ 0	¥ 0	¥ 0
Uncertain tax positions	¥ 0	¥ 0	¥ 0

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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