Loans and borrowings - Other borrowings (Details) - CNY (¥) |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Loans and borrowings | ||
| Carrying amount | ¥ 3,452,000,000 | |
| Secured bank loans | Minimum | ||
| Loans and borrowings | ||
| Weighted average effective interest rate | 0.70% | |
| Secured bank loans | Maximum | ||
| Loans and borrowings | ||
| Weighted average effective interest rate | 7.64% | |
| Letters of credit | ||
| Loans and borrowings | ||
| Aggregated amount | ¥ 777,422,000 | ¥ 575,578,000 |
| Letters of credit | Minimum | ||
| Loans and borrowings | ||
| Interest rate | 1.05% | 2.07% |
| Letters of credit | Maximum | ||
| Loans and borrowings | ||
| Interest rate | 1.45% | 2.20% |