feat(frontend): add v2 design system tokens

[DevanshuNEU]

Overview

Implements the foundational design system for Frontend v2 redesign. All future components will use these tokens for consistent styling.

Changes

frontend/src/index.css

Complete rewrite with v2 design tokens:

• Color tokens: Premium dark theme with near-black background (#09090b), indigo accent (#6366f1)
• Glassmorphism tokens: --glass-bg, --glass-blur, --glass-border for blur effects
• Typography: Inter (UI) + JetBrains Mono (code), responsive scale
• Animation tokens: Expo easing, multiple durations, stagger delays
• Component classes: .glass, .btn-*, .input-glass, .card-glass, .badge-*
• Utility classes: .hover-lift, .hover-glow, .text-gradient, .scrollbar-thin
• Shadcn compatibility: HSL variables maintained for existing components

frontend/tailwind.config.js

Extended Tailwind with design tokens:

• Custom colors mapped to CSS variables
• Animation presets and keyframes
• Shadow utilities including glow effects
• Backdrop blur for glassmorphism

frontend/src/lib/design-tokens.ts (new)

TypeScript constants for JS/TS usage:

• All color, spacing, animation values as constants
• Framer Motion variants (fadeIn, scaleIn, blurIn)
• Helper functions (getCSSVar, setCSSVar)
• Type exports for type safety

Design Decisions

• Dark by default: No light mode toggle needed, devs prefer dark
• Indigo accent: Signals intelligence/premium (vs generic blue)
• Glassmorphism: Subtle, not overdone - 3-5% opacity backgrounds
• Animation easing: Expo curves for premium feel

Testing

• npm run build passes
• No TypeScript errors
• CSS custom properties render correctly

Related

Closes #110
Part of Epic #109

Screenshots

N/A - These are tokens, visual testing will come with component implementation (#111, #112)

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Project	Deployment	Review	Updated (UTC)
opencodeintel	Ready	Preview, Comment	Dec 23, 2025 6:33pm