Initial commit: JMESPath Testing Tool

- React-based web application for testing JMESPath expressions
- macOS-first containerization with Apple container command
- Bootstrap UI with real-time evaluation
- GitHub Actions CI/CD pipeline
- Docker fallback support
- Comprehensive documentation and development scripts

src/App.css

@@ -0,0 +1,69 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  padding: 20px;
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+/* Custom card styling */
+.card {
+  border: none;
+  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
+}
+
+.card-header {
+  background-color: #f8f9fa;
+  border-bottom: 2px solid #dee2e6;
+  font-weight: 600;
+}
+
+/* Button hover effects */
+.btn {
+  transition: all 0.2s ease;
+}
+
+.btn:hover {
+  transform: translateY(-1px);
+}
+
+/* Responsive adjustments */
+@media (max-width: 768px) {
+  .header-section {
+    padding: 1rem 0;
+  }
+  
+  .display-4 {
+    font-size: 2rem;
+  }
+  
+  .lead {
+    font-size: 1rem;
+  }
+}