Hello,
I have big experience with .NET/C# and any kind of projects, including desktop. Can help with WinForms or WPF, or Web - anything you need.
The task is clear and I already made it - WinForm project with all your requirements: four different pages, styles, close pages by timeout, focus application after 10 secs, etc.
To finish it need integrate your service to work with. To test pages I've made additional buttons which open pages.
All styles like font size, font family, colors, position, application icon, etc. are configurable and really simple to update.
I ready to send you finished version (sources + executable inside) + video I recorded to show how it works. Please ping in chat as I cannot do it and I will send you it before you accept the bid.
Quality is guaranteed. Support any updates you need. Ready to support the application two weeks after release for free to fix any issues you may have.
Thanks!