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Long-term debt - Schedule of long-term bank loans (Details) - Dec. 31, 2024
¥ in Thousands, $ in Millions
USD ($)
CNY (¥)
Schedule Of Maturities Of Long Term Debt [Line Items]    
2025   ¥ 500
Long-term bank loans [Member]    
Schedule Of Maturities Of Long Term Debt [Line Items]    
2025   31,000
2026   3,069,000
Total $ 424.7 ¥ 3,100,000