feat: Refactor inventory display to use a grid layout with improved styling and responsiveness

client/src/components/ControlPanel.css

@@ -564,49 +564,100 @@
   box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
 }
 
-/* Inventory List */
-.inventory-list {
+/* Inventory Grid */
+.inventory-grid {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 0.5rem;
+  max-height: 400px;
+  overflow-y: auto;
+  padding: 0.5rem;
+  background: #0f172a;
+  border-radius: 0.5rem;
+  border: 1px solid #1e293b;
+}
+
+.inventory-slot {
+  aspect-ratio: 1;
   display: flex;
   flex-direction: column;
-  gap: 0.5rem;
-  max-height: 300px;
-  overflow-y: auto;
-}
-
-.inventory-item {
-  display: flex;
   align-items: center;
-  gap: 0.625rem;
-  padding: 0.625rem;
-  background: #1f2937;
-  border: 1px solid #374151;
+  justify-content: center;
+  background: #1e293b;
+  border: 2px solid #334155;
   border-radius: 0.375rem;
+  padding: 0.5rem;
   transition: all 0.2s;
+  cursor: pointer;
+  position: relative;
+  overflow: hidden;
 }
 
-.inventory-item:hover {
+.inventory-slot.empty {
+  background: #0f172a;
+  border-style: dashed;
+  border-color: #1e293b;
+}
+
+.inventory-slot.filled {
+  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
+  border-color: #3b82f6;
+  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.1);
+}
+
+.inventory-slot.filled:hover {
   border-color: #60a5fa;
-  background: #1e3a5f;
-  transform: translateX(4px);
+  background: linear-gradient(135deg, #1e3a5f 0%, #1e293b 100%);
+  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
+  transform: translateY(-2px);
 }
 
-.item-icon {
-  font-size: 1.25rem;
-  flex-shrink: 0;
+.slot-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 0.25rem;
 }
 
-.item-name {
-  flex: 1;
-  color: #e5e7eb;
-  font-size: 0.8125rem;
-  text-transform: capitalize;
+.slot-item .item-icon {
+  font-size: 1.5rem;
+  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
 }
 
-.item-count {
-  color: #9ca3af;
-  font-weight: 600;
+.slot-item .item-count {
+  position: absolute;
+  bottom: 0.25rem;
+  right: 0.25rem;
+  background: rgba(0, 0, 0, 0.8);
+  color: #fff;
+  font-size: 0.625rem;
+  font-weight: 700;
+  padding: 0.125rem 0.375rem;
+  border-radius: 0.25rem;
   font-family: 'Courier New', monospace;
-  font-size: 0.8125rem;
+  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
+}
+
+.slot-name {
+  position: absolute;
+  top: 0.25rem;
+  left: 0.25rem;
+  right: 0.25rem;
+  font-size: 0.5rem;
+  color: #94a3b8;
+  font-weight: 600;
+  text-transform: uppercase;
+  text-align: center;
+  line-height: 1.1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.slot-number {
+  font-size: 0.75rem;
+  color: #475569;
+  font-weight: 600;
 }
 
 /* Responsive Design */
@@ -618,10 +669,43 @@
   .action-grid {
     grid-template-columns: 1fr;
   }
+  
+  .inventory-grid {
+    grid-template-columns: repeat(4, 1fr);
+  }
 }
 
 @media (max-width: 768px) {
   .turtle-grid {
     grid-template-columns: 1fr;
   }
+  
+  .panel-content {
+    flex-direction: column;
+  }
+  
+  .turtle-list {
+    border-bottom: 1px solid #374151;
+    border-right: none;
+  }
+  
+  .inventory-grid {
+    grid-template-columns: repeat(4, 1fr);
+  }
 }
+
+@media (max-width: 480px) {
+  .inventory-grid {
+    grid-template-columns: repeat(4, 1fr);
+    gap: 0.375rem;
+  }
+  
+  .inventory-slot {
+    padding: 0.375rem;
+  }
+  
+  .slot-item .item-icon {
+    font-size: 1.25rem;
+  }
+}
+