feat(ui): enhance landing page styling and responsiveness

[BCA-krishna]

Description

Enhanced the landing page UI with modern styling improvements and better responsiveness.

Changes Made

• Improved spacing and layout consistency
• Added modern hover effects and smooth transitions
• Enhanced feature cards with glassmorphism styling and animations
• Improved button styling and responsiveness
• Enhanced typography readability
• Improved responsiveness for mobile and tablet devices
• Added polished shadows, gradients, and hover interactions

Screenshots

Before

After

Closes #581

[vercel]

@BCA-krishna is attempting to deploy a commit to the PRIYANSHU DOSHI's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[github-actions]

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[Priyanshu-byte-coder]

Two critical issues:

1. Missing EOF newlines — multiple files end without a trailing newline.

2. Hardcoded Tailwind colors break theming — the redesign uses from-slate-950 via-slate-900 to-slate-950, text-white, text-slate-300, etc. These bypass the theme system and will look wrong in light mode. All colors must go through CSS variables:

   • Background: use var(--background)
   • Text: use var(--foreground), var(--muted-foreground)
   • Avoid all raw slate-*, white, black Tailwind classes — use CSS vars instead.

[Priyanshu-byte-coder]

Hardcoded colors must be replaced with CSS vars:

1. Missing EOF newline
2. Raw Tailwind/hardcoded colors:
   • text-white → text-[var(--foreground)]
   • text-slate-300, text-slate-900 → text-[var(--muted-foreground)] / text-[var(--foreground)]
   • bg-white, bg-white/5, bg-white/10, border-white/20, hover:border-white → bg-[var(--background)], bg-[var(--card-muted)], border-[var(--border)]
   • hover:bg-slate-100 → hover:bg-[var(--control-hover)]
   • group-hover:text-blue-300 → group-hover:text-[var(--accent)]

CSS vars in globals.css handle dark/light automatically — no need for raw color classes.

[BCA-krishna]

@Priyanshu-byte-coder Resolved the requested review changes:

• replaced hardcoded Tailwind colors with CSS theme variables
• fixed missing EOF newline issues
• improved spacing, hover effects, and responsiveness while maintaining dark/light theme compatibility

All requested changes have been pushed to the PR branch.