Studied grimmory-tools/grimmory's ebook-reader style.service.ts and adopted
their approach:
- Replace CSS custom property resolution (getComputedStyle) with a hardcoded
THEME_COLORS map containing concrete fg/bg/link values for all 18 themes
in both light and dark modes. No more variable resolution failures.
- Font family now targets body + body * with !important, overriding book CSS
on every element (matching grimmory's approach).
- Colors use grimmory's aggressive pattern:
html, body { color: ... !important; background: none !important; }
body * { color: inherit !important; background-color: ... !important; }
This forces reading theme colors on ALL book elements, overriding inline
styles and book stylesheets.
- Line height uses !important on p, li, blockquote, dd to override book CSS.
- Removed fragile getComputedStyle calls entirely. getCSS() now receives
themeName and themeMode parameters for direct color lookup.