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FAIR VALUE MEASUREMENT - Activities related to fair value of assets (Details) - Recurring - Level 3 - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Wealth management products |  |
Summary of activities related to fair value of assets |  |
Beginning balance | ¥ 1,249,321 | ¥ 2,415,208
Addition | 0 | 357,930
Change in fair value | ¥ 73,241 | ¥ 57,579
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Fair value changes in investments, net | Fair value changes in investments, net
Exchange adjustment | ¥ (27,396) | ¥ 30,163
Disposal | (406,174) | (1,611,559)
Ending balance | 888,992 | 1,249,321
Investments accounted for at fair value |  |
Summary of activities related to fair value of assets |  |
Beginning balance | 67,044 | 115,167
Addition | 12,088 | 100
Change in fair value | ¥ 3,820 | ¥ (43,196)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Fair value changes in investments, net | Fair value changes in investments, net
Disposal | ¥ (100) | ¥ (5,027)
Ending balance | ¥ 82,852 | ¥ 67,044

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