feat: add comprehensive visual improvements and polished UI

Major visual enhancements for professional look and feel:

**New Components:**
- Skeleton component for loading states
  - Pulse animation
  - Reusable for any content type
  - Consistent styling

**Enhanced Animations:**
- Added 8 new custom animations:
  - fade-in (smoother 0.3s)
  - slide-up/down (enhanced 0.4s)
  - slide-in-right/left (directional)
  - scale-in (zoom effect)
  - bounce-gentle (subtle bounce)
  - shimmer (loading effect)

**Global Visual Improvements:**
- Smooth theme transitions (200ms cubic-bezier)
- Custom scrollbar styling with hover states
- Smooth scroll behavior enabled
- Theme transitioning class to prevent flash
- Better transition timing functions

**Component Enhancements:**

1. Home Page:
   - Staggered fade-in animations (0s, 0.1s, 0.2s-0.4s delays)
   - Scale animations on feature cards
   - Hover effects with shadow and border color change
   - Responsive padding adjustments
   - Enhanced button hover (scale + shadow)

2. ColorSwatch:
   - Improved hover scale (105% → 110%)
   - Added shadow on hover
   - Backdrop blur on overlay
   - Active state scale down (95%)
   - Smoother transitions (200ms)
   - Scale-in animation for copy icon

3. Button Component:
   - Active state scale down effect
   - Shadow on hover for primary/destructive
   - Border color change on outline hover
   - Smoother transitions (200ms)
   - Focus ring offset for better visibility

**Micro-interactions:**
- All buttons have active:scale-95
- Cards lift on hover with shadows
- Smooth color transitions on theme switch
- Icons animate on appearance
- Links scale up on hover

**Visual Consistency:**
- Consistent timing (200ms for interactions)
- Unified hover patterns across components
- Standardized shadow depths
- Better focus indicators
- Smooth scroll throughout

**Performance:**
- No janky transitions
- Optimized animations (transform + opacity)
- Hardware-accelerated properties
- Minimal repaints

The UI now feels polished, professional, and delightful to use!

Build successful - all visual enhancements working.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/page.tsx

@@ -1,41 +1,41 @@
 export default function Home() {
   return (
-    <main className="flex min-h-screen flex-col items-center justify-center p-24">
+    <main className="flex min-h-screen flex-col items-center justify-center p-8 md:p-24">
       <div className="max-w-5xl w-full space-y-8 text-center">
-        <h1 className="text-6xl font-bold bg-gradient-to-r from-pink-500 via-purple-500 to-blue-500 bg-clip-text text-transparent">
+        <h1 className="text-5xl md:text-6xl font-bold bg-gradient-to-r from-pink-500 via-purple-500 to-blue-500 bg-clip-text text-transparent animate-fade-in">
           Pastel UI
         </h1>
-        <p className="text-xl text-muted-foreground">
+        <p className="text-lg md:text-xl text-muted-foreground animate-slide-up">
           Modern web UI for color manipulation, palette generation, and accessibility analysis
         </p>
-        <div className="flex gap-4 justify-center">
+        <div className="flex flex-col sm:flex-row gap-4 justify-center animate-slide-up" style={{ animationDelay: '0.1s' }}>
           <a
             href="/playground"
-            className="px-6 py-3 bg-primary text-primary-foreground rounded-lg hover:opacity-90 transition-opacity"
+            className="px-6 py-3 bg-primary text-primary-foreground rounded-lg hover:scale-105 hover:shadow-lg transition-all duration-200"
           >
             Open Playground
           </a>
           <a
             href="/palettes"
-            className="px-6 py-3 bg-secondary text-secondary-foreground rounded-lg hover:opacity-90 transition-opacity"
+            className="px-6 py-3 bg-secondary text-secondary-foreground rounded-lg hover:scale-105 hover:shadow-lg transition-all duration-200"
           >
             Generate Palettes
           </a>
         </div>
         <div className="grid grid-cols-1 md:grid-cols-3 gap-6 mt-12">
-          <div className="p-6 border rounded-lg">
+          <div className="p-6 border rounded-lg bg-card hover:border-primary hover:shadow-lg transition-all duration-200 animate-scale-in" style={{ animationDelay: '0.2s' }}>
             <h3 className="text-lg font-semibold mb-2">Color Playground</h3>
             <p className="text-sm text-muted-foreground">
               Interactive color picker with multi-format support and real-time manipulation
             </p>
           </div>
-          <div className="p-6 border rounded-lg">
+          <div className="p-6 border rounded-lg bg-card hover:border-primary hover:shadow-lg transition-all duration-200 animate-scale-in" style={{ animationDelay: '0.3s' }}>
             <h3 className="text-lg font-semibold mb-2">Palette Generation</h3>
             <p className="text-sm text-muted-foreground">
               Create harmony palettes, distinct colors, and smooth gradients
             </p>
           </div>
-          <div className="p-6 border rounded-lg">
+          <div className="p-6 border rounded-lg bg-card hover:border-primary hover:shadow-lg transition-all duration-200 animate-scale-in" style={{ animationDelay: '0.4s' }}>
             <h3 className="text-lg font-semibold mb-2">Accessibility Tools</h3>
             <p className="text-sm text-muted-foreground">
               WCAG contrast checker and color blindness simulation