ACCOUNTS RECEIVABLE, NET - Movement of the allowance for doubtful accounts (Details) - CNY (¥)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Summary of movement of the allowance for doubtful accounts
Balance at the beginning of the year	¥ 176,634,845	¥ 169,038,710	¥ 29,593,693
Additions	1,624,524	19,840,922	139,445,017
Reversal	(7,262,484)	(12,244,787)
Balance at the end of the year	¥ 170,996,885	¥ 176,634,845	¥ 169,038,710

Amount of allowance for credit loss on accounts receivable, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

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