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Income tax expense/(credit) - Narrative (Details) - subsidiary
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Line Items]      
Number of subsidiaries under two-tiered profit tax rate regime 1 1  
Hong Kong      
Income Tax Disclosure [Line Items]      
Applicable tax rate (%) 16.50% 16.50% 16.50%
The United States      
Income Tax Disclosure [Line Items]      
Applicable tax rate (%) 21.00%