TAXATION - Movement of Valuation Allowances (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
TAXATION
At beginning of year	¥ (1,047,994)	¥ (357,198)	¥ (243,141)
Current year additions	(492,555)	(744,084)	(222,649)
Utilization and reversal of valuation allowances	211,972	53,288	108,592
At end of year	¥ (1,328,577)	¥ (1,047,994)	¥ (357,198)

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant