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Summary of significant accounting policies (Details Narrative) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2010
Jun. 30, 2010
Statement [Line Items]            
Net loss ¥ 8.0          
Common stock, shares issued 36,000,000,000         20,000,000
Intangible assets estimated useful life 12 years          
Net operating cash outflow ¥ 3.4          
Current liabilities 8.7          
Share-based compensation 0.8 ¥ 1.7        
Statutory reserve ¥ 0.3 ¥ 0.2        
PRC [Member]            
Statement [Line Items]            
Interest and fee income 6.00%          
Equity Incentive Plan [member]            
Statement [Line Items]            
Common stock, shares issued     1,069,615 269,252 23,200,000  
Number of share awarded 2,000,000,000          
Ordinary shares 384,000,000