v3.26.1
Financial risk management and fair values - Currency risk - Sensitivity analysis (Details) - Currency risk - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
United States Dollars    
Disclosure of nature and extent of risks arising from financial instruments    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 2,127 ¥ 2,311
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (2,127) ¥ (2,311)
Euros    
Disclosure of nature and extent of risks arising from financial instruments    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 544 ¥ 1,089
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (544) ¥ (1,089)
Great British Pound    
Disclosure of nature and extent of risks arising from financial instruments    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 226 ¥ (1)
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (226) ¥ 1
Hong Kong Dollars    
Disclosure of nature and extent of risks arising from financial instruments    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 186 ¥ 561
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (186) ¥ (561)
Singapore Dollars    
Disclosure of nature and extent of risks arising from financial instruments    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 60 ¥ 12
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (60) ¥ (12)
Renminbi    
Disclosure of nature and extent of risks arising from financial instruments    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 37 ¥ 31
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (37) ¥ (31)
Other currencies    
Disclosure of nature and extent of risks arising from financial instruments    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 64 ¥ 10
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (64) ¥ (10)