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Intangible asset (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cost, beginning balance ¥ 46,102,000 ¥ 44,852,000
Disposal of discontinued business   (9,000)
Foreign current translation differences (1,934,000) 1,259,000
Cost, ending balance 44,168,000 46,102,000
Accumulated amortization, beginning balance 0 5,000
Disposal of discontinued business, accumulated amortization   (5,000)
Accumulated amortization, ending Balance 0 0
Carrying amount 44,168,000 46,102,000
Acquired Computer Software [Member]    
Cost, beginning balance 0 9,000
Disposal of discontinued business   (9,000)
Foreign current translation differences 0 0
Cost, ending balance 0 0
Accumulated amortization, beginning balance 0 5,000
Disposal of discontinued business, accumulated amortization   (5,000)
Accumulated amortization, ending Balance 0 0
Carrying amount 0 0
Land Use Right [Member]    
Cost, beginning balance 46,102,000 44,843,000
Disposal of discontinued business   0
Foreign current translation differences (1,934,000) 1,259,000
Cost, ending balance 44,168,000 46,102,000
Accumulated amortization, beginning balance 0 0
Disposal of discontinued business, accumulated amortization   0
Accumulated amortization, ending Balance 0 0
Carrying amount ¥ 44,168,000 ¥ 46,102,000