Add comprehensive reading theme system with 18 themes organized into 5 categories.
All themes include light and dark mode variants, optimized for readability and
eye comfort during long reading sessions.
Theme Categories:
1. Classic Reading (6 themes)
- Light, Paper, Sepia, Parchment, Warm, Candlelight
- Time-tested, comfortable for general reading
2. Sky & Atmosphere (4 themes)
- Azure, Sky, Arctic, Frost
- Open, airy, contemplative feel with blue tones
3. Sunset & Warmth (3 themes)
- Dusk, Sunset, Twilight
- Warm, energizing colors for evening reading
4. Nature & Earth (3 themes)
- Forest, Moss, Slate
- Grounded, natural, calming greens and grays
5. High Performance (2 themes)
- OLED, Solarized
- Optimized for specific use cases (battery saving, precision design)
Theme Features:
- All themes pass WCAG AAA contrast standards (7:1 ratio)
- Each theme has light and dark mode variants
- CSS custom properties for dynamic theme switching
- Optimized color temperatures for different lighting conditions
- Inspired by best practices from e-readers (Kindle, Kobo) and community projects (Grimmory)
Design Principles:
- Readability first: Avoid pure black on pure white (causes eye strain)
- Color temperature: Warm tones for evening, cool tones for daytime focus
- Typography support: Works seamlessly with 9 bundled libre fonts
- Progressive enhancement: Themes work without JavaScript
File: web/static/foliate-themes.css (301 lines)
- CSS custom properties for each theme variant
- Typography base styles (font-family, font-size, line-height, margins)
- Link, selection, and image handling styles
- Orphan/widow prevention for better text flow
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