Fix team builder width on mobile

- Operator select: 3 columns instead of 4
- Reduced padding on team builder container
- Smaller team slots (70px instead of 90px)

css/style.css

@@ -703,9 +703,19 @@
 
             .hero h1 { font-size: 48px; }
             .operator-grid { grid-template-columns: repeat(2, 1fr); }
-            .operator-select { grid-template-columns: repeat(4, 1fr); }
+            .operator-select { grid-template-columns: repeat(3, 1fr); }
             .guide-grid { grid-template-columns: 1fr; }
 
+            .team-builder {
+                padding: 20px;
+            }
+
+            .team-slot {
+                width: 70px;
+                height: 70px;
+                font-size: 20px;
+            }
+
             /* Fix operator cards on mobile for long names */
             .operator-card h4 {
                 font-size: 12px;