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Summary of significant accounting policies - Recent accounting pronouncements (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Amount of outstanding payment obligations under the supplier finance program | ¥ 221,523 | ¥ 186,261
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] | Accounts Payable And Notes Payable, Current | Accounts Payable And Notes Payable, Current
Amount of assets pledged to secure outstanding payments | ¥ 15,651 | ¥ 15,615
Balance at the beginning of the year | 186,261 | 228,104
Invoices confirmed during the year | 621,071 | 392,323
Confirmed invoices paid during the year | (585,809) | (434,166)
Balance at the end of the year | ¥ 221,523 | ¥ 186,261
Minimum |  |
Majority of suppliers, term | 60 days |
Maximum |  |
Majority of suppliers, term | 180 days |

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