Aggregate dividends declared during the period for each share of common stock outstanding.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Subsequent events (Details)	3 Months Ended		12 Months Ended
Subsequent events (Details)	Mar. 31, 2026 $ / shares	Mar. 31, 2026 CNY (¥)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($) $ / shares	Dec. 31, 2024 $ / shares	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 $ / shares	Dec. 31, 2023 CNY (¥)
Subsequent events
Proceeds from short-term borrowings			¥ 725,376,532	$ 103,727,465		¥ 133,500,000		¥ 802,500,000
Dividends				$ 0.0887	$ 0.028		$ 0.056
ADS
Subsequent events
Dividends				$ 0.53	$ 0.17		$ 0.34
Subsequent Event
Subsequent events
Proceeds from short-term borrowings \| ¥		¥ 113,818,669
Interest rate (in percent)	3.25%	3.25%
Subsequent Event \| O 2026 H1 Dividends
Subsequent events
Dividends	$ 0.0467
Dividends payable date		May 20, 2026
Dividend record date		Apr. 30, 2026
Subsequent Event \| O 2026 H1 Dividends \| ADS
Subsequent events
Dividends	$ 0.28