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SHARE-BASED COMPENSATION - Compensation expenses (Details) | 12 Months Ended
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Dec. 31, 2025 CNY (¥) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($)
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | ¥ 1,904,924,000 |  | ¥ 2,726,075,000 |  | ¥ 3,215,549,000 |
Tax Benefit From Compensation Expense | $ |  | $ 0 |  | $ 0 |  | $ 0
Vesting schedule of the restricted shares | 0 |  | 0 |  | 0 |
Cost of revenues |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | 446,120,000 | 63,794,000 | 521,293,000 |  | 502,523,000 |
Sales and marketing expenses |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | 181,877,000 | 26,008,000 | 197,320,000 |  | 180,465,000 |
General and administrative expenses |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | 1,111,415,000 | 158,931,000 | 1,821,817,000 |  | 2,345,895,000 |
Research and development expenses |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | 165,512,000 | $ 23,668,000 | 185,645,000 |  | 186,666,000 |
Share options |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | 138,456,000 |  | 541,956,000 |  | 771,151,000 |
Restricted share units |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | 1,250,460,000 |  | 1,097,177,000 |  | 813,294,000 |
Restricted shares |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |
Share-based compensation related to share options | ¥ 516,008,000 |  | ¥ 1,086,942,000 |  | ¥ 1,631,104,000 |

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