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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