docs: update journal entry with mobile experience fix

journal.rst

@@ -218,12 +218,25 @@ if (!document.querySelector(`link[href*="${cssFile}"]`)) {
 - Desktop: Centered modal with 70vw width, 800px max-width
 - Mobile (≤480px): Full-screen modal for touch interfaces
 
+**Phase 5: Mobile Experience Restoration**
+
+After initial deployment, discovered the mobile experience was broken - modals weren't filling the full screen on mobile devices. Fixed by:
+
+1. **Added `!important` declarations** to mobile media query overrides in PicoCSS stylesheet
+2. **Increased mobile breakpoint** from 480px to 768px to properly cover tablets and larger phones
+3. **Updated JavaScript detection** to match CSS breakpoint (768px) for consistency
+
+**Final Mobile Responsiveness:**
+- Desktop (>768px): Centered modal with 70vw width, 800px max-width  
+- Mobile/Tablet (≤768px): Full-screen modal (100vw × 100vh) for optimal touch experience
+
 **Results**
 
 ✅ **Modal Sizing Fixed**: No more full-screen modals on large displays
 ✅ **CSS Architecture Clean**: All inline styles moved to dedicated CSS files  
 ✅ **Cross-Site Compatibility**: Consistent behavior on blog sites and PicoCSS sites
 ✅ **Translation Pages Fixed**: Proper CSS loading in new window contexts
+✅ **Mobile Experience Restored**: Full-screen modals on phones and tablets
 ✅ **Developer Experience**: Maintainable CSS architecture with clear separation of concerns
 
 This refactoring resolved the immediate user experience issues while establishing a robust, maintainable CSS architecture that prevents similar problems in the future.