diff --git a/dist/css/styles.css b/dist/css/styles.css
index 3704b1a..a2b273b 100644
--- a/dist/css/styles.css
+++ b/dist/css/styles.css
@@ -1074,15 +1074,14 @@ button:focus-visible {
 .nav-overlay {
   position: fixed;
   inset: 0;
-  background: rgba(0, 0, 0, 0.4);
+  background: rgba(0, 0, 0, 0.5);
   z-index: 120;
   opacity: 0;
   visibility: hidden;
-  transition: opacity 0.3s ease, visibility 0.3s ease;
+  transition: opacity 0.25s ease, visibility 0.25s ease;
   pointer-events: none;
-  -webkit-tap-highlight-color: transparent;
-  backdrop-filter: blur(10px);
-  -webkit-backdrop-filter: blur(10px);
+  backdrop-filter: blur(4px);
+  -webkit-backdrop-filter: blur(4px);
 }
 
 .nav-open .nav-overlay {
@@ -1095,50 +1094,34 @@ button:focus-visible {
 @media (max-width: 900px) {
   .nav-toggle {
     display: inline-flex;
-    width: 48px !important;
-    height: 48px !important;
+    width: 44px !important;
+    height: 44px !important;
   }
 
   .header-nav {
     display: none;
     position: fixed;
-    inset: 0;
-    padding: var(--space-xl) var(--space-xl) var(--space-3xl);
-    padding-top: calc(var(--space-xl) + env(safe-area-inset-top, 0px));
-    background: linear-gradient(180deg, rgba(248, 250, 255, 0.96) 0%, rgba(255, 255, 255, 0.98) 55%, rgba(255, 255, 255, 0.94) 100%);
-    border: none;
-    box-shadow: none;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    width: min(85vw, 400px);
+    padding: var(--space-3xl) var(--space-xl);
+    padding-top: calc(var(--space-3xl) + env(safe-area-inset-top, 0px));
+    background: var(--bg-elevated);
+    border-left: 1px solid var(--border-primary);
     display: flex;
     flex-direction: column;
-    gap: var(--space-sm);
+    gap: var(--space-md);
     overflow-y: auto;
     overflow-x: hidden;
-    overscroll-behavior: contain;
-    -webkit-overflow-scrolling: touch;
-    transform: translateX(105%);
-    transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
+    transform: translateX(100%);
+    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
     z-index: 140;
-    will-change: transform;
-    backdrop-filter: blur(18px);
-    -webkit-backdrop-filter: blur(18px);
-  }
-
-  .header-nav::before {
-    content: '';
-    position: absolute;
-    inset: 0;
-    pointer-events: none;
-    background: radial-gradient(120% 120% at 50% 0%, rgba(99, 102, 241, 0.08) 0%, rgba(59, 130, 246, 0.04) 45%, rgba(15, 23, 42, 0) 100%);
-    z-index: -1;
+    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
   }
 
   [data-theme="dark"] .header-nav {
-    background: linear-gradient(180deg, rgba(15, 23, 42, 0.96) 0%, rgba(15, 23, 42, 0.98) 60%, rgba(15, 23, 42, 0.94) 100%);
-    box-shadow: none;
-  }
-
-  [data-theme="dark"] .header-nav::before {
-    background: radial-gradient(120% 120% at 50% 0%, rgba(37, 99, 235, 0.2) 0%, rgba(59, 130, 246, 0.12) 45%, rgba(15, 23, 42, 0) 100%);
+    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.5);
   }
 
   .nav-open .header-nav {
@@ -1155,27 +1138,21 @@ button:focus-visible {
     align-items: center;
     justify-content: space-between;
     gap: var(--space-lg);
-    padding: 0 0 var(--space-xl);
+    padding-bottom: var(--space-xl);
     margin-bottom: var(--space-lg);
-    border-bottom: 1px solid rgba(148, 163, 184, 0.4);
-  }
-
-  [data-theme="dark"] .nav-mobile-header {
-    border-bottom-color: rgba(71, 85, 105, 0.4);
+    border-bottom: 1px solid var(--border-primary);
   }
 
   .nav-mobile-brand {
     display: flex;
     flex-direction: column;
-    gap: var(--space-2xs);
+    gap: var(--space-xs);
   }
 
   .nav-mobile-title {
-    font-size: clamp(1rem, 2.8vw, 1.15rem);
-    font-weight: 600;
+    font-size: var(--text-lg);
+    font-weight: var(--font-semibold);
     color: var(--text-primary);
-    letter-spacing: 0.08em;
-    text-transform: uppercase;
   }
 
   .nav-mobile-subtitle {
@@ -1187,33 +1164,20 @@ button:focus-visible {
     display: inline-flex;
     align-items: center;
     justify-content: center;
-    width: 44px;
-    height: 44px;
-    border-radius: var(--radius-full);
-    border: 1px solid rgba(148, 163, 184, 0.5);
-    background: rgba(255, 255, 255, 0.92);
+    width: 40px;
+    height: 40px;
+    border-radius: var(--radius-md);
+    border: 1px solid var(--border-primary);
+    background: var(--bg-secondary);
     color: var(--text-primary);
-    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.12);
-    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
+    transition: all var(--transition-fast);
   }
 
   .nav-close:hover,
   .nav-close:focus-visible {
-    transform: scale(1.05);
-    background: rgba(255, 255, 255, 1);
-    border-color: rgba(99, 102, 241, 0.55);
-  }
-
-  [data-theme="dark"] .nav-close {
-    background: rgba(30, 41, 59, 0.9);
-    border-color: rgba(71, 85, 105, 0.7);
-    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.4);
-    color: var(--text-primary);
-  }
-
-  [data-theme="dark"] .nav-close:hover,
-  [data-theme="dark"] .nav-close:focus-visible {
-    border-color: rgba(147, 197, 253, 0.6);
+    background: var(--bg-tertiary);
+    border-color: var(--primary);
+    color: var(--primary);
   }
 
   .nav-close svg {
@@ -1222,36 +1186,28 @@ button:focus-visible {
 
   .nav-open a.nav-link {
     width: 100%;
-    justify-content: space-between;
-    font-size: clamp(1.05rem, 3vw, 1.2rem);
-    font-weight: 600;
-    padding: var(--space-lg) var(--space-xl);
-    border-radius: var(--radius-xl);
-    min-height: 52px;
-    background: rgba(99, 102, 241, 0.1);
+    font-size: var(--text-base);
+    font-weight: var(--font-medium);
+    padding: var(--space-md) var(--space-lg);
+    border-radius: var(--radius-md);
+    background: transparent;
     color: var(--text-primary);
-    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.12);
-    margin-bottom: var(--space-sm);
-    text-align: left;
+    border: 1px solid transparent;
+    transition: all var(--transition-fast);
   }
 
   .nav-open a.nav-link:hover,
   .nav-open a.nav-link:focus-visible {
-    background: rgba(99, 102, 241, 0.18);
+    background: var(--bg-secondary);
+    border-color: var(--border-primary);
     color: var(--primary);
-    box-shadow: 0 20px 42px rgba(15, 23, 42, 0.16);
   }
 
-  [data-theme="dark"] .nav-open a.nav-link {
-    background: rgba(59, 130, 246, 0.18);
-    color: var(--text-primary);
-    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.45);
-  }
-
-  [data-theme="dark"] .nav-open a.nav-link:hover,
-  [data-theme="dark"] .nav-open a.nav-link:focus-visible {
-    background: rgba(59, 130, 246, 0.26);
-    color: var(--primary-light);
+  .nav-open a.nav-link[aria-current="page"] {
+    background: var(--bg-secondary);
+    border-color: var(--primary);
+    color: var(--primary);
+    font-weight: var(--font-semibold);
   }
 
   .nav-open .nav-link::before,
@@ -1261,13 +1217,9 @@ button:focus-visible {
 
   .dark-mode-toggle {
     display: flex;
-    flex: 0 0 auto;
     width: 40px !important;
     height: 40px !important;
-    order: 3;
-    align-self: flex-start;
     margin-left: auto;
-    z-index: 150;
   }
 
   .nav-toggle {