Removed unnecessary class
Bump content down slightly
Replaced divs with spans. Used inline-block where possible. Removed containers where possible. Simplified and slimmed down markup and CSS.
Cleaned up actions bar
Responsive patches for actions bar.
Added a little behaviour for tabs
Style tweaks
Lots of little formatting details.
Minor positioning fixes.
Add more example fields; tune whitespace.
More whitespace tuning.
Move back button to the filters bar on mobile.

This makes the mobile version look more like a native mobile app, and has the
pleasant side effect of freeing up vertical space when viewing a record.
Auto-hide back button's text when screen width is less than 385px.
Fix widths at 320px.
Remove unnecessary line.
Minor tweaks to height of `.filters` panel.
Last one, I promise.