Excellent plug-in, thank you.
I loaded my own arconics-shortcodes.css file and it is working great. Excellent design work - I can keep my changes with the theme.
I am working AOK. No problem here!
But I think there is a css file name issue.
I noticed that there was no original version of arconics-shortcodes.css in your files. I went to copy it, and only found shortcodes.css.
But I see your code looks for it, in several places, including your own files -- and I think design-wise your are following the style.css convention. So you might consider making the names consistent.