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Leases - Components of lease cost (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Lessee Disclosure [Abstract]    
Operating lease costs ¥ 25,289 ¥ 22,854
Short-term lease costs 1,529 1,660
Total ¥ 26,818 ¥ 24,514