Visual Refresh of Docs UI (`style.css` only)

[Gautam-Bharadwaj]

Summary: Visual Refresh of Docs UI (style.css only)

Scope:

• All changes are CSS-only (style.css)
• No edits to HTML, JavaScript, or content
• Visual and polish-focused (colors, layout, shadows, typography, UI tokens)
• Dark mode rules deliberately left untouched (follow-up planned)

Goals:

• Modernize documentation UI
• Increase professionalism and subtlety in visual design
• Maintain or improve accessibility
• Preserve all existing functionality (no behavioral changes)

Key Improvements:

• Introduced a clean, neutral color palette (slate & blue, better theming)
• Established UI tokens for radius and elevation (more consistent styling)
• Refined typography: better line-height for reading, lighter h1, improved font selection
• Flatter, more modern buttons: blue accent, reduced radius, softer shadow
• Hero section: removed heavy white box, tightened spacing for clarity
• Sidebar: now a professional card (white background, soft border, gentle shadow, consistent padding)
• CTA button: inline & pill-shaped on wide screens (more integrated with hero)
• Animation list: removed decorative gradients, hovered states are more subtle
• Docs header: minimal, subtle border—no gradients or deep shadows
• Code blocks: darker background, subtle border/radius, no heavy shadow
• Layout: set max container width, harmonized spacing for easier reading
• Visual polish: reduced border radii and heavy shadows throughout; gentler hover effects

Accessibility:

• Maintained all prefers-reduced-motion/accessibility rules
• Improved contrast and readability
• No changes to dark mode (for stability—suggested as a follow-up)

File changes:

• style.css: all changes are within this file

Reviewer notes:

• Please visually verify:
  • Hero callout has no white box, CTA is inline on desktop
  • Sidebar uses new card style
  • All features (clipboard, toggles, animation demos) still work
• Test standard, dark, and reduced-motion settings for regressions
• Recommend follow-up PR for dark mode harmony

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Suggested PR Title:
style(docs): professional visual refresh for docs (palette, typography, sidebar, CTA)

[Gautam-Bharadwaj]

@aziz @sorrycc @codex73 @kmiyashiro

Hi all,
I've opened a new issue detailing a professional visual refresh for the docs UI (CSS-only, no changes to HTML/JS/content). I’m confident I can resolve and implement these improvements myself.

Please review the summary and let me know if you have any additional feedback or specific requests. I’m ready to proceed with the PR!

Thank you!