Improve mobile layout width

Adjusted mobile view to enhance width without affecting the desktop layout.
[skip gpt_engineer]

src/App.css

@@ -1,10 +1,16 @@
 #root {
   max-width: 1280px;
   margin: 0 auto;
-  padding: 2rem;
+  padding: 0.5rem;
   text-align: center;
 }
 
+@media (min-width: 640px) {
+  #root {
+    padding: 2rem;
+  }
+}
+
 .logo {
   height: 6em;
   padding: 1.5em;

src/components/game/ExpertMemo.css

@@ -2,14 +2,21 @@
 
 .expert-memo {
     background-color: rgba(0, 0, 0, 0.3);
-    padding: 2rem;
+    padding: 1rem;
     border: 1px solid rgb(234 179 8);
     font-family: monospace;
     box-shadow: 0 0 10px rgba(234, 179, 8, 0.2);
+    width: 100%;
     max-width: 800px;
     margin: 0 auto;
 }
 
+@media (min-width: 640px) {
+    .expert-memo {
+        padding: 2rem;
+    }
+}
+
 .expert-memo.alert {
     border-color: rgb(239 68 68);
     box-shadow: 0 0 10px rgba(239, 68, 68, 0.2);
@@ -27,9 +34,16 @@
     margin-bottom: 1rem;
     text-align: center;
     letter-spacing: 0.1em;
+    padding: 0.5rem;
+    font-size: 1.25rem;
+    text-transform: uppercase;
+}
+
+@media (min-width: 640px) {
+    .memo-label {
         padding: 0.75rem;
         font-size: 1.5rem;
-    text-transform: uppercase;
+    }
 }
 
 .memo-label.standard {
@@ -62,7 +76,6 @@
     line-height: 1.5;
 }
 
-/* Add spacing between paragraphs */
 .memo-body p {
     margin-bottom: 1.5rem;
 }