diff --git a/docs/PRD.md b/docs/PRD.md
index e2d595d..5c8003c 100644
--- a/docs/PRD.md
+++ b/docs/PRD.md
@@ -1175,5 +1175,473 @@ const validateFirebaseConfig = () => {
 
 ---
 
-## 20️⃣ Development Setup & Configuration
+## 20️⃣ Third-Party UI Libraries & Responsive Design  
+
+### **Current UI Implementation:**
+The application currently uses **Tailwind CSS** for styling with custom components. While functional, this approach requires significant custom development for responsive design and native platform feel.
+
+### **Recommended UI Library Options:**
+
+#### **1. Ionic React (Recommended for Native Feel):**
+```bash
+npm install @ionic/react @ionic/core
+```
+
+**Benefits:**
+- **Native Platform Feel:** Mimics iOS and Android native components
+- **Responsive Design:** Built-in responsive grid and components
+- **Touch Optimized:** Optimized for touch interactions
+- **Accessibility:** Excellent accessibility support
+- **Cross-Platform:** Works seamlessly on mobile, tablet, and desktop
+- **Component Library:** Rich set of pre-built components
+
+**Integration Pattern:**
+```typescript
+// src/components/common/IonicButton.tsx
+import { IonButton, IonIcon } from '@ionic/react';
+import { add, heart, play } from 'ionicons/icons';
+
+export const IonicActionButton: React.FC<ActionButtonProps> = ({
+  onClick,
+  children,
+  variant = 'primary',
+  icon,
+  disabled = false
+}) => {
+  const getVariant = () => {
+    switch (variant) {
+      case 'primary': return 'primary';
+      case 'secondary': return 'medium';
+      case 'danger': return 'danger';
+      default: return 'primary';
+    }
+  };
+
+  return (
+    <IonButton
+      onClick={onClick}
+      disabled={disabled}
+      fill={getVariant()}
+      size="small"
+    >
+      {icon && <IonIcon icon={icon} slot="start" />}
+      {children}
+    </IonButton>
+  );
+};
+```
+
+#### **2. Chakra UI (Recommended for Modern Web):**
+```bash
+npm install @chakra-ui/react @emotion/react @emotion/styled framer-motion
+```
+
+**Benefits:**
+- **Modern Design System:** Clean, accessible design system
+- **Responsive Components:** Built-in responsive design patterns
+- **Theme Support:** Excellent theming and customization
+- **Accessibility:** WCAG compliant components
+- **TypeScript:** Full TypeScript support
+- **Performance:** Optimized for performance
+
+**Integration Pattern:**
+```typescript
+// src/components/common/ChakraButton.tsx
+import { Button, ButtonProps } from '@chakra-ui/react';
+
+export const ChakraActionButton: React.FC<ActionButtonProps> = ({
+  onClick,
+  children,
+  variant = 'primary',
+  size = 'md',
+  disabled = false
+}) => {
+  const getVariant = () => {
+    switch (variant) {
+      case 'primary': return 'blue';
+      case 'secondary': return 'gray';
+      case 'danger': return 'red';
+      default: return 'blue';
+    }
+  };
+
+  return (
+    <Button
+      onClick={onClick}
+      disabled={disabled}
+      colorScheme={getVariant()}
+      size={size}
+      variant="solid"
+    >
+      {children}
+    </Button>
+  );
+};
+```
+
+#### **3. Material-UI (MUI) (Recommended for Google Material Design):**
+```bash
+npm install @mui/material @emotion/react @emotion/styled @mui/icons-material
+```
+
+**Benefits:**
+- **Material Design:** Google's Material Design principles
+- **Comprehensive Components:** Extensive component library
+- **Responsive Grid:** Advanced responsive grid system
+- **Theme Customization:** Powerful theming capabilities
+- **Icon Library:** Large icon library included
+- **Enterprise Ready:** Production-ready for enterprise applications
+
+**Integration Pattern:**
+```typescript
+// src/components/common/MUIButton.tsx
+import { Button, ButtonProps } from '@mui/material';
+import { Add, Favorite, PlayArrow } from '@mui/icons-material';
+
+export const MUIActionButton: React.FC<ActionButtonProps> = ({
+  onClick,
+  children,
+  variant = 'primary',
+  icon,
+  disabled = false
+}) => {
+  const getVariant = () => {
+    switch (variant) {
+      case 'primary': return 'contained';
+      case 'secondary': return 'outlined';
+      case 'danger': return 'contained';
+      default: return 'contained';
+    }
+  };
+
+  const getColor = () => {
+    switch (variant) {
+      case 'danger': return 'error';
+      default: return 'primary';
+    }
+  };
+
+  return (
+    <Button
+      onClick={onClick}
+      disabled={disabled}
+      variant={getVariant()}
+      color={getColor()}
+      startIcon={icon && <Add />}
+    >
+      {children}
+    </Button>
+  );
+};
+```
+
+### **Responsive Design Implementation:**
+
+#### **Mobile-First Approach:**
+```typescript
+// Responsive breakpoints
+const BREAKPOINTS = {
+  mobile: '320px',
+  tablet: '768px',
+  desktop: '1024px',
+  wide: '1440px',
+} as const;
+
+// Responsive component pattern
+export const ResponsiveLayout: React.FC = ({ children }) => {
+  return (
+    <div className="
+      w-full max-w-full
+      px-4 sm:px-6 lg:px-8
+      py-2 sm:py-4 lg:py-6
+    ">
+      {children}
+    </div>
+  );
+};
+```
+
+#### **Responsive Navigation:**
+```typescript
+// Mobile: Bottom navigation
+// Tablet/Desktop: Top navigation
+export const ResponsiveNavigation: React.FC = () => {
+  const isMobile = useMediaQuery('(max-width: 768px)');
+  
+  return isMobile ? (
+    <MobileBottomNavigation />
+  ) : (
+    <DesktopTopNavigation />
+  );
+};
+```
+
+#### **Responsive Grid System:**
+```typescript
+// Responsive grid for song lists
+export const ResponsiveSongGrid: React.FC = ({ songs }) => {
+  return (
+    <div className="
+      grid
+      grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4
+      gap-4 sm:gap-6 lg:gap-8
+    ">
+      {songs.map(song => (
+        <SongCard key={song.id} song={song} />
+      ))}
+    </div>
+  );
+};
+```
+
+### **Native Platform Feel Implementation:**
+
+#### **Touch Interactions:**
+```typescript
+// Touch-optimized components
+export const TouchOptimizedButton: React.FC<ButtonProps> = ({
+  onClick,
+  children,
+  ...props
+}) => {
+  return (
+    <button
+      onClick={onClick}
+      className="
+        min-h-[44px] min-w-[44px] // iOS touch target minimum
+        active:scale-95 // Touch feedback
+        transition-transform duration-150
+        focus:outline-none focus:ring-2 focus:ring-blue-500
+      "
+      {...props}
+    >
+      {children}
+    </button>
+  );
+};
+```
+
+#### **Swipe Gestures:**
+```typescript
+// Swipe to delete functionality
+export const SwipeableSongItem: React.FC<SongItemProps> = ({
+  song,
+  onDelete,
+  ...props
+}) => {
+  const [swipeOffset, setSwipeOffset] = useState(0);
+  
+  const handleTouchStart = (e: React.TouchEvent) => {
+    // Touch start logic
+  };
+  
+  const handleTouchMove = (e: React.TouchEvent) => {
+    // Touch move logic with swipe detection
+  };
+  
+  const handleTouchEnd = () => {
+    // Touch end logic with delete action
+  };
+  
+  return (
+    <div
+      className="relative overflow-hidden"
+      onTouchStart={handleTouchStart}
+      onTouchMove={handleTouchMove}
+      onTouchEnd={handleTouchEnd}
+    >
+      <div
+        className="transform transition-transform duration-200"
+        style={{ transform: `translateX(${swipeOffset}px)` }}
+      >
+        {/* Song item content */}
+      </div>
+      <div className="absolute right-0 top-0 h-full w-20 bg-red-500 flex items-center justify-center">
+        <span className="text-white">Delete</span>
+      </div>
+    </div>
+  );
+};
+```
+
+### **UI Library Migration Strategy:**
+
+#### **Phase 1: Component Abstraction Layer:**
+```typescript
+// src/components/ui/index.ts
+export { ActionButton } from './ActionButton';
+export { SongItem } from './SongItem';
+export { Modal } from './Modal';
+export { Toast } from './Toast';
+
+// src/components/ui/ActionButton.tsx
+import { useUIProvider } from '../../hooks/useUIProvider';
+
+export const ActionButton: React.FC<ActionButtonProps> = (props) => {
+  const { uiLibrary } = useUIProvider();
+  
+  switch (uiLibrary) {
+    case 'ionic':
+      return <IonicActionButton {...props} />;
+    case 'chakra':
+      return <ChakraActionButton {...props} />;
+    case 'mui':
+      return <MUIActionButton {...props} />;
+    default:
+      return <TailwindActionButton {...props} />;
+  }
+};
+```
+
+#### **Phase 2: Theme Configuration:**
+```typescript
+// src/theme/index.ts
+export const themeConfig = {
+  colors: {
+    primary: {
+      50: '#eff6ff',
+      500: '#3b82f6',
+      600: '#2563eb',
+      700: '#1d4ed8',
+    },
+    secondary: {
+      50: '#f9fafb',
+      500: '#6b7280',
+      600: '#4b5563',
+      700: '#374151',
+    },
+  },
+  spacing: {
+    xs: '0.25rem',
+    sm: '0.5rem',
+    md: '1rem',
+    lg: '1.5rem',
+    xl: '2rem',
+  },
+  breakpoints: {
+    mobile: '320px',
+    tablet: '768px',
+    desktop: '1024px',
+    wide: '1440px',
+  },
+};
+```
+
+#### **Phase 3: Progressive Enhancement:**
+```typescript
+// src/hooks/useUIProvider.ts
+export const useUIProvider = () => {
+  const [uiLibrary, setUILibrary] = useState<'tailwind' | 'ionic' | 'chakra' | 'mui'>('tailwind');
+  
+  useEffect(() => {
+    // Detect device capabilities and set appropriate UI library
+    const isMobile = /Android|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
+    const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
+    
+    if (isMobile && !prefersReducedMotion) {
+      setUILibrary('ionic');
+    } else if (window.innerWidth >= 1024) {
+      setUILibrary('chakra');
+    }
+  }, []);
+  
+  return { uiLibrary, setUILibrary };
+};
+```
+
+### **Performance Considerations:**
+
+#### **Bundle Size Optimization:**
+```typescript
+// Lazy load UI libraries
+const IonicComponents = lazy(() => import('./IonicComponents'));
+const ChakraComponents = lazy(() => import('./ChakraComponents'));
+const MUIComponents = lazy(() => import('./MUIComponents'));
+
+// Conditional loading based on device
+export const UILibraryProvider: React.FC = ({ children }) => {
+  const { uiLibrary } = useUIProvider();
+  
+  return (
+    <Suspense fallback={<div>Loading...</div>}>
+      {uiLibrary === 'ionic' && <IonicComponents />}
+      {uiLibrary === 'chakra' && <ChakraComponents />}
+      {uiLibrary === 'mui' && <MUIComponents />}
+      {children}
+    </Suspense>
+  );
+};
+```
+
+#### **Tree Shaking:**
+```typescript
+// Import only needed components
+import { Button } from '@chakra-ui/react/button';
+import { Icon } from '@chakra-ui/react/icon';
+// Instead of: import { Button, Icon } from '@chakra-ui/react';
+```
+
+### **Accessibility Enhancements:**
+
+#### **Screen Reader Support:**
+```typescript
+// Enhanced accessibility for UI libraries
+export const AccessibleButton: React.FC<ButtonProps> = ({
+  children,
+  ariaLabel,
+  ...props
+}) => {
+  return (
+    <button
+      aria-label={ariaLabel}
+      role="button"
+      tabIndex={0}
+      onKeyDown={(e) => {
+        if (e.key === 'Enter' || e.key === ' ') {
+          e.preventDefault();
+          props.onClick?.(e as any);
+        }
+      }}
+      {...props}
+    >
+      {children}
+    </button>
+  );
+};
+```
+
+### **Implementation Recommendations:**
+
+#### **For Mobile-First Applications:**
+- **Primary Choice:** Ionic React
+- **Fallback:** Chakra UI with mobile optimizations
+- **Focus:** Touch interactions, swipe gestures, native feel
+
+#### **For Cross-Platform Web Applications:**
+- **Primary Choice:** Chakra UI
+- **Fallback:** Material-UI
+- **Focus:** Responsive design, accessibility, modern aesthetics
+
+#### **For Enterprise Applications:**
+- **Primary Choice:** Material-UI
+- **Fallback:** Chakra UI
+- **Focus:** Consistency, accessibility, enterprise features
+
+### **Migration Timeline:**
+1. **Week 1-2:** Set up UI library and create abstraction layer
+2. **Week 3-4:** Migrate core components (buttons, inputs, modals)
+3. **Week 5-6:** Implement responsive design patterns
+4. **Week 7-8:** Add native platform features (touch, gestures)
+5. **Week 9-10:** Performance optimization and testing
+
+### **Success Metrics:**
+- **Mobile Performance:** 90+ Lighthouse score on mobile
+- **Touch Responsiveness:** <100ms touch response time
+- **Accessibility:** WCAG 2.1 AA compliance
+- **Bundle Size:** <200KB gzipped for UI library
+- **User Experience:** Improved user engagement metrics
+
+---
+
+## 21️⃣ Development Setup & Configuration