- Define semantic color tokens (--color-bg, --color-text, etc.)
- Add .theme-dark, .theme-light, .theme-system CSS classes
- Create theme.ts utility for theme application
- Add early boot theme script to prevent FOUC
- Support system preference with live updates
- Add mobile-specific styles for pre/code elements with word-wrap
- Use pre-wrap for code blocks to wrap long lines on mobile
- Add max-width and overflow-x constraints to main pane container
- Add overflow-x: hidden to body to prevent horizontal scrolling
- Handle tables and images with max-width: 100% on mobile
- Ensure all content respects viewport width on mobile devices
- Set sidebars to always have 100vh height on desktop
- Add drop-shadow to left sidebar (2px right shadow)
- Add drop-shadow to right highlights panel (2px left shadow)
- Improves visual separation and depth perception
- Changed mobile .pane.main padding from 0.5rem to 0
- Content now extends fully edge-to-edge on mobile
- Matches design expectation for mobile reading experience
- Add explicit overflow: visible to main pane
- Add height: auto to main pane
- Ensure three-pane container doesn't constrain height
- Force styles to override any inherited overflow
- Convert mobile hamburger and highlights buttons to Tailwind
- Migrate mobile backdrop to Tailwind utilities
- Remove 60+ lines of CSS from app.css and sidebar.css
- Maintain responsive behavior and z-index layering
- Keep dynamic color support for highlight button
