My approach to writing manageable scalable CSS ( I am a programmer) is to never write CSS files on my own. Use a framework like Zurb Foundation etc. and modify

My approach to writing manageable scalable CSS ( I am a programmer) is to never write CSS files on my own. Use a framework like Zurb Foundation etc. and modify the underlying SASS files but never ever write actual CSS files. And scan my HTML for style tags to ensure that I never violate my own rule.