feat: Global CSS matching CODE-NARRATIVE-AI style (glass-nav, stripe-shadow, grid patterns)

frontend/src/index.css

@@ -2,13 +2,69 @@
 @tailwind components;
 @tailwind utilities;
 
+* { margin: 0; padding: 0; box-sizing: border-box; }
+
+html { scroll-behavior: smooth; }
+
 body {
-  background: #0a0a0f;
-  color: #e4e4e7;
+  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+::selection {
+  background: rgba(16, 185, 129, 0.15);
 }
 
 ::-webkit-scrollbar { width: 6px; height: 6px; }
 ::-webkit-scrollbar-track { background: transparent; }
-::-webkit-scrollbar-thumb { background: #333; border-radius: 3px; }
+::-webkit-scrollbar-thumb { background: #334155; border-radius: 3px; }
+::-webkit-scrollbar-thumb:hover { background: #475569; }
+
+/* CODE-NARRATIVE style: glass nav */
+.glass-nav {
+  background: rgba(255, 255, 255, 0.8);
+  backdrop-filter: blur(12px);
+  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
+}
+
+/* Stripe-style shadow for cards */
+.shadow-stripe {
+  box-shadow:
+    0 0 0 1px rgba(0, 0, 0, 0.03),
+    0 2px 4px rgba(0, 0, 0, 0.05),
+    0 12px 24px rgba(0, 0, 0, 0.05);
+}
+
+/* Grid pattern background */
+.linear-grid {
+  background-image:
+    linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
+    linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
+  background-size: 60px 60px;
+}
 
-select option { background: #1a1a2e; color: #e4e4e7; }
+/* Animated cursor */
+.cursor::after {
+  content: '|';
+  animation: blink 1s infinite;
+}
+
+@keyframes blink {
+  0%, 50% { opacity: 1; }
+  51%, 100% { opacity: 0; }
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; transform: translateY(8px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+.animate-fade-in {
+  animation: fadeIn 0.4s ease-out;
+}
+
+/* Dark mode base (since we toggle via class) */
+.dark {
+  color-scheme: dark;
+}