Related party transactions - Transactions with other related parties (Details) - HKD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Related party transactions [abstract] | ||
| Consultancy and management service income | $ 468,000 | $ 468,000 |
| Rental expense | 360,000 | 0 |
| Sales and marketing service income | $ 420,916 | $ 238,328 |