feat: implement Tailwind CSS styling based on wireframe design
- Add brand colours, fonts (Space Grotesk/Inter/Fira Code), box shadows to tailwind.config.js
- Add bg-grid-pattern, text-gradient, scrollbar, selection styles to input.css
- Add Google Fonts link and dark-mode body classes to base.html
- Style nav, footer, cookie banner, newsletter form components
- Style homepage: featured article, 12-col editorial grid, sidebar widgets
- Style article list: header, tag filters, horizontal article cards, pagination
- Style article page: hero header, prose body, share sidebar, related cards, comments
- Style code blocks and callout blocks
- CSS output grows from 4.8KB to 24KB with all brand utilities compiled
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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