feat(ui): add design foundation — CSS tokens, noise texture, card glow effects

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TaskTracker.Web/src/index.css

@@ -2,22 +2,81 @@
 
 @theme {
   --font-sans: 'Inter', system-ui, sans-serif;
+  --color-page: #0a0a0f;
+  --color-surface: #12131a;
+  --color-elevated: #1a1b26;
+  --color-border: rgba(255, 255, 255, 0.06);
+  --color-border-hover: rgba(255, 255, 255, 0.12);
+  --color-text-primary: #e2e8f0;
+  --color-text-secondary: #64748b;
+  --color-text-tertiary: #334155;
+  --color-accent: #8b5cf6;
+  --color-accent-end: #6366f1;
+  --color-status-active: #3b82f6;
+  --color-status-paused: #eab308;
+  --color-status-completed: #22c55e;
+  --color-status-pending: #64748b;
 }
 
+/* Noise grain texture */
+body::before {
+  content: '';
+  position: fixed;
+  inset: 0;
+  z-index: 9999;
+  pointer-events: none;
+  opacity: 0.03;
+  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
+  background-repeat: repeat;
+  background-size: 256px 256px;
+}
+
+/* Active task pulse */
 @keyframes pulse-glow {
   0%, 100% {
-    box-shadow: 0 0 8px rgba(6, 182, 212, 0.3);
+    box-shadow: 0 0 6px rgba(59, 130, 246, 0.3);
   }
   50% {
-    box-shadow: 0 0 20px rgba(6, 182, 212, 0.5);
+    box-shadow: 0 0 16px rgba(59, 130, 246, 0.5);
   }
 }
 
 .animate-pulse-glow {
-  animation: pulse-glow 2s ease-in-out infinite;
+  animation: pulse-glow 2.5s ease-in-out infinite;
 }
 
-/* Custom scrollbar for dark theme */
+/* Live dot pulse */
+@keyframes live-dot {
+  0%, 100% { opacity: 1; }
+  50% { opacity: 0.4; }
+}
+
+.animate-live-dot {
+  animation: live-dot 1.5s ease-in-out infinite;
+}
+
+/* Card hover glow border */
+.card-glow {
+  position: relative;
+}
+
+.card-glow::before {
+  content: '';
+  position: absolute;
+  inset: -1px;
+  border-radius: inherit;
+  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(99, 102, 241, 0.1), transparent);
+  opacity: 0;
+  transition: opacity 0.2s ease;
+  z-index: -1;
+  pointer-events: none;
+}
+
+.card-glow:hover::before {
+  opacity: 1;
+}
+
+/* Custom scrollbar */
 ::-webkit-scrollbar {
   width: 6px;
 }
@@ -27,10 +86,15 @@
 }
 
 ::-webkit-scrollbar-thumb {
-  background: #2a2d37;
+  background: #1a1b26;
   border-radius: 3px;
 }
 
 ::-webkit-scrollbar-thumb:hover {
-  background: #3a3d47;
+  background: #2a2d37;
+}
+
+/* Selection color */
+::selection {
+  background: rgba(139, 92, 246, 0.3);
 }