SCSS with focus on responsiveness

This is my second project using SASS, and I cannot applaud it enough. Using it's partials has done wonders for my organization, and it's modules kept me from repeating tedious code. If you want a good resource for intro to SASS I definitely recommend Traversy Media on youtube.

I am still honing my skills in responsiveness, but this should be a decent attempt.

I took a different approach for form validation with regards to the email-us section. Does anyone have a good resource for these? While my site certainly handles the validation, I would have rather been more accurate in terms of the what the design ("client") was asking of me.

As always ANY and ALL comments are welcome! Any resources for SASS or responsiveness would be greatly appreciated!