v3.26.1
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION        
Net cash provided by/(used in) operating activities ¥ 6,091,062 $ 869,371 ¥ 4,229,272 ¥ 2,900,425
Net cash used in investing activities (7,786,503) (1,111,358) (3,209,806) (3,447,099)
Net cash used in financing activities (333,600) (47,615) 333,600  
Effect of foreign exchange rate changes on cash and cash equivalents (20,711) (2,956) 14,976 7,398
Net (decrease)/ increase in cash and cash equivalents (2,049,752) (292,558) 1,368,042 (539,276)
Cash and cash equivalents and restricted cash at beginning of years 4,406,685 628,960 3,038,643 3,577,919
Cash and cash equivalents and restricted cash at end of years 2,356,933 336,402 4,406,685 3,038,643
Parent Company | Reportable Legal Entities        
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION        
Net cash provided by/(used in) operating activities (1,045,431) (149,213) 1,259,823 (184,240)
Net cash used in investing activities 428,609 61,175 (654,185)  
Effect of foreign exchange rate changes on cash and cash equivalents (6,076) (867) 3,098  
Net (decrease)/ increase in cash and cash equivalents (622,898) (88,905) 608,736 (184,240)
Cash and cash equivalents and restricted cash at beginning of years 639,488 91,273 30,752 214,992
Cash and cash equivalents and restricted cash at end of years ¥ 16,590 $ 2,368 ¥ 639,488 ¥ 30,752