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Leases - Supplemental cash flow information related to operating leases (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases ¥ 39,012 ¥ 31,218 ¥ 40,173
Operating leases ¥ 28,484 ¥ 56,098 ¥ 51,621