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

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) {