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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed statements of comprehensive loss (Parenthetical) (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |  |
Foreign currency translation, net of tax | ¥ 0 | ¥ 0 | ¥ 0
Parent Company |  |  |
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION |  |  |
Foreign currency translation, net of tax | ¥ 0 | ¥ 0 | ¥ 0

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