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SIGNIFICANT ACCOUNTING POLICIES - Concentration and risks (Details) - Institution | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Concentration Risk |  |  |
Number of financial institutions | 5 |  |
Number of customers | no | no | no
Number of suppliers | no | no | no
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution One |  |  |
Concentration Risk |  |  |
Concentration risk, percentage | 16.40% |  |
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Two |  |  |
Concentration Risk |  |  |
Concentration risk, percentage | 13.30% |  |
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Three |  |  |
Concentration Risk |  |  |
Concentration risk, percentage | 9.80% |  |
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Four |  |  |
Concentration Risk |  |  |
Concentration risk, percentage | 9.50% |  |
Cash and cash equivalents, restricted cash, short-term investments and long-term debt investments denominated in RMB | Geographic Concentration Risk | CN | Financial Institution Five |  |  |
Concentration Risk |  |  |
Concentration risk, percentage | 7.20% |  |

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