While one may see design, the design process, and knowing CSS as separate skill sets, you can't dismiss any of them and still expect great web design. As a result, this page is concerned with all of these topics, and more importantly, how they work together to produce a great result, that plays to the web's strengths, and hides its weaknesses.
Let's collect some links. Please add categories as you see fit.
- http://layervault.tumblr.com/post/32267022219/flat-interface-design
- http://www.minimallyminimal.com/2012/7/3/the-next-microsoft.html
- http://layervault.tumblr.com/post/42361566927/progressive-reduction
- Inspiration: http://dribbble.com/shots/popular/
- Inspiration: http://www.awwwards.com/
- Inspiration: http://patterntap.com/
- Extra: http://worrydream.com/ABriefRantOnTheFutureOfInteractionDesign/
- http://nathanbarry.com/wireframing-web-application/
- http://www.markboulton.co.uk/journal/five-simple-steps-to-designing-grid-systems-part-1
- https://github.com/necolas/idiomatic-css
- http://csswizardry.com/2011/09/writing-efficient-css-selectors/
- http://www.stubbornella.org/content/2012/05/02/cross-browser-debugging-css/
- http://css-tricks.com/specifics-on-css-specificity/
- http://reference.sitepoint.com/css/specificity
- http://designshack.net/articles/css/what-the-heck-is-css-specificity/
- http://coding.smashingmagazine.com/2010/04/07/css-specificity-and-inheritance/
- http://coding.smashingmagazine.com/2007/07/27/css-specificity-things-you-should-know/
- http://www.w3.org/TR/CSS21/propidx.html (automatically inherited values overview)
- http://alistapart.com/article/responsive-web-design
- http://learnlayout.com/
- http://coding.smashingmagazine.com/2009/10/19/the-mystery-of-css-float-property/
- https://developer.mozilla.org/en-US/docs/CSS/box_model
- http://css-tricks.com/the-css-box-model/
- http://www.w3.org/TR/css3-ui/#box-sizing
- http://paulirish.com/2012/box-sizing-border-box-ftw/
- http://alistapart.com/article/css-floats-101
- http://css-tricks.com/all-about-floats/
- http://coding.smashingmagazine.com/2007/05/01/css-float-theory-things-you-should-know/
- https://github.com/andreasbovens/understanding-viewport
- http://alistapart.com/article/css-positioning-101
- http://blog.alexmaccaw.com/css-transitions
- http://daneden.me/animate/
- http://www.html5rocks.com/en/tutorials/speed/high-performance-animations/
- http://smacss.com/
- http://inuitcss.com/
- https://github.com/stubbornella/oocss/wiki
- http://warpspire.com/posts/kss/
- http://perfectionkills.com/profiling-css-for-fun-and-profit-optimization-notes/
- http://www.stevesouders.com/blog/2009/04/09/dont-use-import/
- https://developers.google.com/chrome-developer-tools/docs/elements-styles
- http://wtfhtmlcss.com/
- http://www.amazon.com/Handcrafted-CSS-Bulletproof-Design-Essentials/dp/0321658531
- http://www.smashingmagazine.com/2012/12/22/talks-to-help-you-become-a-better-front-end-engineer-in-2013/
- http://www.abookapart.com/products/responsive-web-design
- http://www.fivesimplesteps.com/products/a-practical-guide-to-designing-for-the-web
- http://www.fivesimplesteps.com/products/the-icon-handbook
- http://nathanbarry.com/webapps/
- http://sidebar.io/
- https://developer.mozilla.org/en/docs/CSS
- http://css-tricks.com/
- http://www.abookapart.com/products/css3-for-web-designers
- http://css-weekly.com/
- http://html5weekly.com/
- http://www.html5rocks.com/en/tutorials/speed/parallax/
- http://www.html5rocks.com/en/tutorials/speed/scrolling/