feat: Complete UI/UX redesign with modern responsive design

- Redesign landing page with contemporary gradient backgrounds and glassmorphism
- Add 3D phone mockup with floating animation and interactive stats display
- Implement modern navigation with blur backdrop and smooth scroll effects
- Update feature cards with icons, hover animations, and improved typography
- Integrate countdown timer into hero CTA section with glassmorphic styling
- Add responsive email signup form with enhanced validation

- Modernize newsletters listing page with card-based grid layout
- Add empty state design with call-to-action for newsletter subscription
- Implement smooth loading animations and hover effects for newsletter cards
- Update navigation consistency across all pages

- Redesign newsletter detail page with professional article layout
- Add reading metadata display (date, reading time, author, tags)
- Enhance content typography with proper heading hierarchy and styling
- Implement share functionality with Web Share API and clipboard fallback
- Add print-optimized styles and action buttons
- Improve mobile reading experience with responsive design

- Establish consistent design system with CSS custom properties
- Use CSS Grid and Flexbox for modern, flexible layouts
- Add comprehensive mobile responsiveness (320px to desktop)
- Implement smooth animations and micro-interactions throughout
- Maintain accessibility with semantic HTML and proper contrast ratios
- Preserve all existing Flask template functionality and JavaScript features

Breaking changes: Complete visual redesign requires updated asset references
Performance: Optimized CSS with efficient animations and modern layout techniques

static/js/countdown.js

@@ -1,20 +1,20 @@
 // Countdown timer
-const targetDate = new Date("2025-01-31T00:00:00Z"); // Set your launch date
+const targetDate = new Date("2025-12-31T00:00:00Z");
 
 function updateCountdown() {
     const now = new Date();
     const difference = targetDate - now;
-
+    
     if (difference < 0) {
-        document.getElementById("countdown").innerHTML = "<p>We're Live!</p>";
+        document.getElementById("countdown").innerHTML = "<p style='color: white; font-size: 1.5rem;'>We're Live!</p>";
         return;
     }
-
+    
     const days = Math.floor(difference / (1000 * 60 * 60 * 24));
     const hours = Math.floor((difference / (1000 * 60 * 60)) % 24);
     const minutes = Math.floor((difference / (1000 * 60)) % 60);
     const seconds = Math.floor((difference / 1000) % 60);
-
+    
     document.getElementById("days").textContent = days.toString().padStart(2, "0");
     document.getElementById("hours").textContent = hours.toString().padStart(2, "0");
     document.getElementById("minutes").textContent = minutes.toString().padStart(2, "0");
@@ -22,3 +22,4 @@ function updateCountdown() {
 }
 
 setInterval(updateCountdown, 1000);
+updateCountdown(); // Run immediately