refactor(ui): improve UI/UX design and spacing

- Increase card padding and gaps for better visual hierarchy
- Add hover lift effect to cards with smooth transitions
- Improve typography with larger headings and better line-height
- Darken meta text colors for better readability
- Add checkbox styling with accent color
- Make tags interactive with hover effects
- Add mobile responsive styles for forms and footer
- Replace Unicode arrows with SVG icons
- Improve focus styles for accessibility
- Increase badge padding and font-weight
- Add subtle shadow to cards by default

app/presentation/templates/pages/index.html

@@ -50,7 +50,12 @@
                 <span class="tag" data-testid="post-tag-{{ post.id }}-{{ loop.index }}">{{ tag }}</span>
                 {% endfor %}
             </div>
-            <a href="/posts/{{ post.id }}" class="btn btn-sm" data-testid="btn-read-more-{{ post.id }}">Read more</a>
+            <a href="/posts/{{ post.id }}" class="btn btn-sm" data-testid="btn-read-more-{{ post.id }}">
+                Read more
+                <svg width="14" height="14" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-left: 0.25rem;">
+                    <path d="M6 12L10 8L6 4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                </svg>
+            </a>
         </div>
     </article>
     {% endfor %}

app/presentation/templates/pages/post_detail.html

@@ -39,7 +39,10 @@
         
         <div class="flex justify-between items-center" data-testid="post-detail-actions">
             <a href="/" class="btn" data-testid="btn-back-to-posts">
-                ← Back to posts
+                <svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg" style="margin-right: 0.5rem;">
+                    <path d="M10 12L6 8L10 4" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                </svg>
+                Back to posts
             </a>
             
             <div class="flex gap-2" data-testid="post-detail-edit-actions">

app/presentation/templates/partials/header.html

@@ -15,15 +15,15 @@
                 type="button" 
                 class="theme-toggle" 
                 data-testid="theme-toggle"
-                aria-label="Toggle theme"
-                title="Toggle theme"
+                aria-label="Toggle dark mode"
+                title="Toggle dark mode"
             >
                 <svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg" data-testid="theme-light-icon" style="display: none;">
-                    <path d="M10 2v2M10 16v2M4.22 4.22l1.42 1.42M14.36 14.36l1.42 1.42M2 10h2M16 10h2M4.22 15.78l1.42-1.42M14.36 5.64l1.42-1.42" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>
-                    <circle cx="10" cy="10" r="4" stroke="currentColor" stroke-width="2"/>
+                    <path d="M10 2v2M10 16v2M4.22 4.22l1.42 1.42M14.36 14.36l1.42 1.42M2 10h2M16 10h2M4.22 15.78l1.42-1.42M14.36 5.64l1.42-1.42" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                    <circle cx="10" cy="10" r="3" stroke="currentColor" stroke-width="2"/>
                 </svg>
                 <svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg" data-testid="theme-dark-icon" style="display: none;">
-                    <path d="M18 10.79A9 9 0 1 1 9.21 2 7 7 0 0 0 18 10.79z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+                    <path d="M17.293 13.293A8 8 0 116.707 2.707a8.003 8.003 0 0010.586 10.586z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
                 </svg>
             </button>
             

static/css/base.css

@@ -102,7 +102,15 @@ pre code {
 /* Focus styles */
 :focus-visible {
   outline: 2px solid var(--color-primary);
-  outline-offset: 2px;
+  outline-offset: 3px;
+}
+
+/* Enhanced link focus for accessibility */
+a:focus-visible,
+.btn:focus-visible,
+.nav-link:focus-visible {
+  outline: 2px solid var(--color-primary);
+  outline-offset: 4px;
 }
 
 /* Scrollbar */

static/css/components.css

@@ -104,13 +104,14 @@
 .card {
   background-color: var(--color-box-body);
   border: 1px solid var(--color-border);
-  border-radius: 6px;
+  border-radius: 8px;
   overflow: hidden;
-  transition: box-shadow 0.2s ease;
+  box-shadow: 0 1px 3px var(--color-shadow);
+  transition: all 0.2s ease;
 }
 
 .card:hover {
-  box-shadow: 0 2px 8px var(--color-shadow);
+  box-shadow: 0 4px 12px var(--color-shadow);
 }
 
 .card-header {
@@ -121,7 +122,7 @@
 }
 
 .card-body {
-  padding: 1.25rem;
+  padding: 1.5rem 2rem;
 }
 
 .card-footer {
@@ -254,13 +255,14 @@
 .badge {
   display: inline-flex;
   align-items: center;
-  padding: 0.125rem 0.5rem;
+  padding: 0.25rem 0.75rem;
   font-size: 0.75rem;
-  font-weight: 500;
+  font-weight: 600;
   line-height: 1.5;
   border-radius: 9999px;
   background-color: var(--color-label-bg);
   color: var(--color-label-text);
+  white-space: nowrap;
 }
 
 .badge-primary {
@@ -288,16 +290,31 @@
   display: inline-flex;
   align-items: center;
   gap: 0.25rem;
-  padding: 0.125rem 0.5rem;
-  font-size: 0.75rem;
+  padding: 0.25rem 0.75rem;
+  font-size: 0.8125rem;
+  font-weight: 500;
   background-color: var(--color-secondary-light-3);
   border: 1px solid var(--color-border);
-  border-radius: 4px;
+  border-radius: 6px;
   color: var(--color-text-light);
+  cursor: pointer;
+  transition: all 0.2s ease;
 }
 
 .tag:hover {
-  background-color: var(--color-hover);
+  background-color: var(--color-primary-alpha-10);
+  border-color: var(--color-primary);
+  color: var(--color-primary);
+}
+
+/* Checkbox styling */
+input[type="checkbox"] {
+  width: 1.25rem;
+  height: 1.25rem;
+  margin-right: 0.5rem;
+  accent-color: var(--color-primary);
+  cursor: pointer;
+  vertical-align: middle;
 }
 
 /* Avatar */

static/css/layout.css

@@ -228,14 +228,20 @@
 .post-list {
   display: flex;
   flex-direction: column;
-  gap: 1.5rem;
+  gap: 2rem;
 }
 
 /* Post card specific */
 .post-card {
   display: flex;
   flex-direction: column;
-  gap: 1rem;
+  gap: 1.25rem;
+  padding: 1.5rem;
+  transition: all 0.2s ease;
+}
+
+.post-card:hover {
+  transform: translateY(-2px);
 }
 
 .post-card-header {
@@ -247,7 +253,8 @@
 
 .post-card-title {
   margin-bottom: 0;
-  font-size: 1.25rem;
+  font-size: 1.5rem;
+  line-height: 1.3;
 }
 
 .post-card-title a {
@@ -263,7 +270,8 @@
   align-items: center;
   gap: 1rem;
   font-size: 0.875rem;
-  color: var(--color-text-light-2);
+  color: var(--color-text-light-1);
+  margin-bottom: 0.75rem;
 }
 
 .post-card-meta-item {
@@ -273,8 +281,9 @@
 }
 
 .post-card-content {
-  color: var(--color-text-light);
-  line-height: 1.6;
+  color: var(--color-text-light-1);
+  line-height: 1.7;
+  font-size: 1rem;
 }
 
 .post-card-footer {
@@ -423,15 +432,70 @@
 @media (max-width: 768px) {
   .site-header .container {
     height: 3.5rem;
+    padding: 0 1.25rem;
   }
-  
+
   .main-nav {
     display: none;
   }
-  
+
   .mobile-menu-btn {
     display: flex;
   }
+
+  /* Form actions mobile */
+  .form-actions {
+    flex-direction: column-reverse;
+    gap: 1rem;
+  }
+
+  .form-actions .btn {
+    width: 100%;
+  }
+
+  /* Footer mobile */
+  .site-footer .container {
+    flex-direction: column;
+    text-align: center;
+    gap: 1.5rem;
+    padding: 2rem 1rem;
+  }
+
+  .footer-links {
+    flex-wrap: wrap;
+    justify-content: center;
+  }
+
+  /* Post card mobile */
+  .post-card {
+    padding: 1.25rem;
+  }
+
+  .post-card-title {
+    font-size: 1.25rem;
+  }
+
+  .post-card-header {
+    flex-direction: column;
+    gap: 0.75rem;
+  }
+
+  .post-card-footer {
+    flex-direction: column;
+    align-items: flex-start;
+    gap: 1rem;
+  }
+
+  /* Page header mobile */
+  .page-header-flex {
+    flex-direction: column;
+    align-items: flex-start;
+    gap: 1rem;
+  }
+
+  .page-title {
+    font-size: 1.75rem;
+  }
 }
 
 @media (min-width: 769px) {