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Finance (costs)/income - net (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finance income      
Interest income on bank deposits ¥ 67,484 ¥ 29,580 ¥ 14,709
Finance costs      
Interest expense on borrowings (10,491) (12,070) (17,303)
Interest expense on lease liabilities (1,930) (3,005) (7,224)
Interest expense on redemption liability   (4,014) (10,287)
Bank charges (868) (997) (2,005)
Total finance costs (13,289) (20,086) (36,819)
Finance (costs)/income - net ¥ 54,195 ¥ 9,494 ¥ (22,110)