Switch accent color to green and improve text contrast

- Change accent colors from purple to emerald green (#10b981)
- Improve navbar text contrast (use text-primary instead of text-secondary)
- Improve footer link contrast
- Update all glow/shadow effects to match green theme
- Bump muted/tertiary text colors for better readability

frontend/src/components/Layout.css

@@ -68,7 +68,7 @@
   align-items: center;
   gap: 8px;
   padding: 8px 16px;
-  color: var(--text-secondary);
+  color: var(--text-primary);
   font-size: 0.875rem;
   font-weight: 500;
   border-radius: var(--radius-md);
@@ -82,11 +82,11 @@
 
 .nav a.active {
   color: var(--accent-primary);
-  background: rgba(99, 102, 241, 0.1);
+  background: rgba(16, 185, 129, 0.1);
 }
 
 .nav a svg {
-  opacity: 0.7;
+  opacity: 0.8;
 }
 
 .nav a:hover svg,
@@ -95,7 +95,7 @@
 }
 
 .nav-link-muted {
-  opacity: 0.6;
+  opacity: 0.7;
 }
 
 /* Main content */
@@ -129,7 +129,7 @@
 }
 
 .footer-tagline {
-  color: var(--text-tertiary);
+  color: var(--text-secondary);
   font-size: 0.875rem;
 }
 
@@ -139,13 +139,13 @@
 }
 
 .footer-links a {
-  color: var(--text-tertiary);
+  color: var(--text-secondary);
   font-size: 0.875rem;
   transition: color var(--transition-fast);
 }
 
 .footer-links a:hover {
-  color: var(--text-secondary);
+  color: var(--text-primary);
 }
 
 /* Responsive */

frontend/src/index.css

@@ -12,22 +12,22 @@
   --bg-elevated: #222225;
   --bg-hover: #2a2a2e;
 
-  /* Accent colors */
-  --accent-primary: #6366f1;
-  --accent-primary-hover: #818cf8;
-  --accent-secondary: #8b5cf6;
-  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
+  /* Accent colors - Green/Emerald theme */
+  --accent-primary: #10b981;
+  --accent-primary-hover: #34d399;
+  --accent-secondary: #059669;
+  --accent-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
 
-  /* Text colors */
-  --text-primary: #fafafa;
-  --text-secondary: #a1a1aa;
-  --text-tertiary: #71717a;
-  --text-muted: #52525b;
+  /* Text colors - improved contrast */
+  --text-primary: #f9fafb;
+  --text-secondary: #d1d5db;
+  --text-tertiary: #9ca3af;
+  --text-muted: #6b7280;
 
   /* Border colors */
   --border-primary: #27272a;
   --border-secondary: #3f3f46;
-  --border-accent: #6366f1;
+  --border-accent: #10b981;
 
   /* Status colors */
   --success: #22c55e;
@@ -41,7 +41,7 @@
   --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
   --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
   --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
-  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
+  --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.3);
 
   /* Transitions */
   --transition-fast: 150ms ease;

frontend/src/pages/Home.css

@@ -34,12 +34,12 @@
 .btn-primary {
   background: var(--accent-gradient);
   color: white;
-  box-shadow: var(--shadow-sm), 0 0 20px rgba(99, 102, 241, 0.2);
+  box-shadow: var(--shadow-sm), 0 0 20px rgba(16, 185, 129, 0.2);
 }
 
 .btn-primary:hover {
   transform: translateY(-1px);
-  box-shadow: var(--shadow-md), 0 0 30px rgba(99, 102, 241, 0.3);
+  box-shadow: var(--shadow-md), 0 0 30px rgba(16, 185, 129, 0.3);
 }
 
 .btn-primary:active {
@@ -120,7 +120,7 @@
 .form-group textarea:focus {
   outline: none;
   border-color: var(--accent-primary);
-  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
+  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
   background: var(--bg-elevated);
 }
 

frontend/src/pages/PackagePage.css

@@ -1,8 +1,8 @@
 /* Upload Section */
 .upload-section {
   margin-bottom: 32px;
-  background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
-  border: 1px solid rgba(99, 102, 241, 0.2);
+  background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(5, 150, 105, 0.05) 100%);
+  border: 1px solid rgba(16, 185, 129, 0.2);
 }
 
 .upload-section h3 {