Mandarin.im website

A landing page for one of my project - http://mandarin.im/eng/index.htm
Mandarin is a tiny messenger for android devices.
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Actually, it's my first time experience of creating responsive web page.
It works and looks perfectly on Android devices and Desktops and fortunately has a few bugs on ios devices (hope to fix it soon) =)

I really want to hear some feedback from you guys. So, don't be shy, press "L" and/or leave a comment ;)