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Taxation - Schedule of movement of valuation allowance (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Taxation |  |  |
Balance at beginning of the year | ¥ 512,021 | ¥ 428,709 | ¥ 316,469
Additions | 96,078 | 85,458 | 114,815
Reversals | (654) | (2,146) | (2,575)
Expiration of loss carry forward and impact of close of subsidiaries | (22,957) |  |
Balance at end of the year | ¥ 584,488 | ¥ 512,021 | ¥ 428,709

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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