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Parent company only condensed financial information - Interest in subsidiaries and amount due from subsidiaries (Details) - Parent company - CNY (¥) ¥ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Interest in subsidiaries |  |
Equity investment in subsidiaries | ¥ 1,492,100 | ¥ 2,181,554
Amount due from subsidiaries |  |
Loan receivables | ¥ 1,075,885 | ¥ 803,173

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