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Short-term borrowings -Narrative (Details) - Unsecured bank loans - CNY (¥)
Jun. 30, 2024
Dec. 31, 2023
Short-term borrowings    
Total line of credit ¥ 1,700,000,000 ¥ 1,200,000,000
Unused portion of line of credit 100,000,000 0
Short-term borrowings guaranteed ¥ 0 ¥ 180,000,000
Loan One    
Short-term borrowings    
Interest rate (in percent) 4.00% 3.80%
Loan Two    
Short-term borrowings    
Interest rate (in percent) 3.90% 3.90%
Loan Three    
Short-term borrowings    
Interest rate (in percent)   4.00%