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Share-based payments - Key assumptions of restricted stock units (Details) - Restricted Share Units Scheme - Monte carlo method
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement      
Dividend yield 0.00% 0.00% 0.00%
Minimum      
Disclosure of terms and conditions of share-based payment arrangement      
Risk-free interest rate 1.00% 2.00% 2.00%
Volatility 62.00% 48.00% 43.00%
Maximum      
Disclosure of terms and conditions of share-based payment arrangement      
Risk-free interest rate 2.00% 3.00% 3.00%
Volatility 64.00% 49.00% 49.00%