v3.26.1
Leases (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
m²
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
m²
Leases [Line Items]          
Sublease income ¥ 14,153,470 $ 2,013,640 ¥ 11,725,219 [1] ¥ 707,009  
Sublease cost 12,013,832 1,709,229 11,088,503 858,098  
Total operating lease expenses 11,525,615 1,639,770 11,564,157 24,498,055  
Deposit loss     298,088 1,494,308  
Income from deposits acquired in subleases       1,015,375  
Lease termination gain (loss) 99,388 $ 14,140 1,945,824 ¥ (478,933)  
Derecognition of right-of-use assets     5,772,980    
Lease liabilities ¥ 6,685,177   2,710,673   $ 951,112
Minimum [Member]          
Leases [Line Items]          
Lease liabilities     ¥ 8,016,892    
Leased area (in Square Meters) | m² 100       100
Maximum [Member]          
Leases [Line Items]          
Leased area (in Square Meters) | m² 218       218
[1] For the years ended December 31, 2023, 2024 and 2025, the Group incurred sublease income of RMB707,009, RMB11,725,219 and RMB14,153,470 (US$2,013,640), and sublease cost of RMB858,098, RMB11,088,503 and RMB12,013,832 (US$1,709,229), respectively.