Financial risk management and fair values - Interest Rate Risk - Sensitivity analysis (Details) - Interest rate risk - CNY (¥) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of nature and extent of risks arising from financial instruments | ||
| Percentage of reasonably possible increase in risk assumption | 1.00% | 1.00% |
| Percentage of reasonably possible decrease in risk assumption | (1.00%) | (1.00%) |
| Increase in current year profit due to reasonably possible increase in designated risk component | ¥ 57,502,000 | ¥ 47,805,000 |
| Decrease in current year profit due to reasonably possible decrease in designated risk component | 57,502,000 | 47,805,000 |
| Increase in retained earning due to reasonably possible increase in designated risk component | 57,502,000 | 47,805,000 |
| Decrease in retained earning due to reasonably possible decrease in designated risk component | ¥ 57,502,000 | ¥ 47,805,000 |