Added basic responsive layout

src/styles/global.css

@@ -146,3 +146,13 @@
 .dark ::-webkit-scrollbar-thumb:hover {
   background-color: oklch(0.6 0 0);
 }
+
+/* ===== Animations ===== */
+@keyframes pulse {
+  0%, 100% {
+    opacity: 1;
+  }
+  50% {
+    opacity: 0.5;
+  }
+}