I have windows 7. I know C# and web services (HTML, CSS, JS, ASPX). I want to develop mobile apps with my skills for iOS (the most important option) and android. I'm looking for a studio platform that I could develop there with my skills, something that I can build with my own knowledge and would automatically be adjusted to all platforms. I looked at Xamarin but I can't do it without Mac. PhoneGap doesn't work. Which platforms could you guys recommend me?