Update navigation bar to have a colorful border and smooth hover effects

Adjusted CSS styles for the navigation bar, specifically targeting the border and hover animations.
The `body::after` pseudo-element now has a thicker border with a transition for all properties.
A new `navbar-inner::before` pseudo-element is introduced to create a gradient border effect on hover, with opacity transitioning over 0.6s.
The `.navbar-inner:hover` style is updated to only change the `border-color` to transparent, relying on the new pseudo-element for the visual effect.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 75bceff7-98f2-4f6e-ae8e-e735399a1fe8
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 4cacbb8d-26fe-4135-ab07-2b173705ac19
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/d0a1d46d-d203-4308-bc6a-312ac7c0243b/75bceff7-98f2-4f6e-ae8e-e735399a1fe8/tyNW2LQ

static/css/styles.css

@@ -97,17 +97,33 @@ body::after {
     background: rgba(0, 0, 0, 0.5);
     backdrop-filter: blur(12px);
     -webkit-backdrop-filter: blur(12px);
-    border: 1px solid rgba(255, 255, 255, 0.08);
+    border: 2px solid rgba(255, 255, 255, 0.08);
     border-radius: 16px;
-    transition: border 0.3s ease;
+    transition: all 0.6s ease;
+    position: relative;
+}
+
+.navbar-inner::before {
+    content: '';
+    position: absolute;
+    inset: -2px;
+    border-radius: 16px;
+    padding: 2px;
+    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
+    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
+    -webkit-mask-composite: xor;
+    mask-composite: exclude;
+    opacity: 0;
+    transition: opacity 0.6s ease;
+    pointer-events: none;
+}
+
+.navbar-inner:hover::before {
+    opacity: 1;
 }
 
 .navbar-inner:hover {
-    border: 1px solid transparent;
+    border-color: transparent;
-    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), 
-                      linear-gradient(90deg, #3b82f6, #8b5cf6);
-    background-origin: border-box;
-    background-clip: padding-box, border-box;
 }
 
 .navbar-logo {