Modern dark mode UI overhaul

frontend/src/index.css

@@ -5,34 +5,97 @@
 }
 
 :root {
-  --primary: #2d5a27;
-  --primary-light: #4a8c3f;
-  --primary-dark: #1e3d1a;
-  --secondary: #8b4513;
-  --background: #f5f5f0;
-  --surface: #ffffff;
-  --text: #333333;
-  --text-light: #666666;
-  --border: #e0e0e0;
-  --success: #28a745;
-  --error: #dc3545;
-  --warning: #ffc107;
+  /* Dark mode color palette */
+  --bg-primary: #0a0a0b;
+  --bg-secondary: #111113;
+  --bg-tertiary: #1a1a1d;
+  --bg-elevated: #222225;
+  --bg-hover: #2a2a2e;
+
+  /* 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 - improved contrast */
+  --text-primary: #f9fafb;
+  --text-secondary: #d1d5db;
+  --text-tertiary: #9ca3af;
+  --text-muted: #6b7280;
+
+  /* Border colors */
+  --border-primary: #27272a;
+  --border-secondary: #3f3f46;
+  --border-accent: #10b981;
+
+  /* Status colors */
+  --success: #22c55e;
+  --success-bg: rgba(34, 197, 94, 0.1);
+  --error: #ef4444;
+  --error-bg: rgba(239, 68, 68, 0.1);
+  --warning: #f59e0b;
+  --warning-bg: rgba(245, 158, 11, 0.1);
+
+  /* Shadows */
+  --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(16, 185, 129, 0.3);
+
+  /* Transitions */
+  --transition-fast: 150ms ease;
+  --transition-normal: 250ms ease;
+  --transition-slow: 350ms ease;
+
+  /* Border radius */
+  --radius-sm: 6px;
+  --radius-md: 8px;
+  --radius-lg: 12px;
+  --radius-xl: 16px;
+}
+
+html {
+  color-scheme: dark;
 }
 
 body {
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
-  background-color: var(--background);
-  color: var(--text);
+  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
+  background-color: var(--bg-primary);
+  color: var(--text-primary);
   line-height: 1.6;
+  font-size: 14px;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+/* Scrollbar styling */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-track {
+  background: var(--bg-secondary);
+}
+
+::-webkit-scrollbar-thumb {
+  background: var(--border-secondary);
+  border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: var(--text-tertiary);
 }
 
 a {
-  color: var(--primary);
+  color: var(--accent-primary);
   text-decoration: none;
+  transition: color var(--transition-fast);
 }
 
 a:hover {
-  text-decoration: underline;
+  color: var(--accent-primary-hover);
 }
 
 button {
@@ -41,7 +104,13 @@ button {
 }
 
 .container {
-  max-width: 1200px;
+  max-width: 1280px;
   margin: 0 auto;
-  padding: 0 20px;
+  padding: 0 24px;
+}
+
+/* Selection */
+::selection {
+  background: var(--accent-primary);
+  color: white;
 }