diff --git a/web/client/src/components/InventoryGrid.css b/web/client/src/components/InventoryGrid.css
new file mode 100644
index 0000000..4dd1683
--- /dev/null
+++ b/web/client/src/components/InventoryGrid.css
@@ -0,0 +1,324 @@
+.inventory-panel {
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+/* Toolbar */
+.inventory-toolbar {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  padding: 0.5rem 0.75rem;
+  background: #3b3b3b;
+  border-bottom: 2px solid var(--mc-dark);
+  flex-shrink: 0;
+  flex-wrap: wrap;
+}
+
+.search-box {
+  display: flex;
+  align-items: center;
+  background: var(--mc-dark);
+  border: 2px solid #333;
+  padding: 0.25rem 0.5rem;
+  flex: 1;
+  min-width: 180px;
+}
+
+.search-icon {
+  font-size: 0.8rem;
+  margin-right: 0.375rem;
+}
+
+.search-input {
+  border: none;
+  background: transparent;
+  color: var(--mc-text-white);
+  font-family: 'Silkscreen', 'Courier New', monospace;
+  font-size: 0.7rem;
+  outline: none;
+  width: 100%;
+}
+
+.search-input::placeholder {
+  color: var(--mc-text-gray);
+}
+
+.search-clear {
+  background: none;
+  border: none;
+  color: var(--mc-text-gray);
+  cursor: pointer;
+  font-size: 0.7rem;
+  padding: 0 0.25rem;
+}
+
+.search-clear:hover {
+  color: var(--mc-text-red);
+}
+
+.sort-controls {
+  display: flex;
+  gap: 0.25rem;
+}
+
+.item-count-label {
+  font-size: 0.6rem;
+  color: var(--mc-text-gray);
+  white-space: nowrap;
+}
+
+/* Body */
+.inventory-body {
+  flex: 1;
+  display: flex;
+  overflow: hidden;
+}
+
+/* Item Grid */
+.item-grid-wrapper {
+  flex: 1;
+  overflow-y: auto;
+  padding: 0.5rem;
+}
+
+.item-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
+  gap: 3px;
+  padding: 8px;
+  background: var(--mc-inv-bg);
+  border: 3px solid var(--mc-dark);
+  box-shadow:
+    inset 3px 3px 0 #fefefe,
+    inset -3px -3px 0 #555;
+  min-height: 200px;
+}
+
+.item-slot {
+  aspect-ratio: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  background: var(--mc-inv-slot);
+  border: 2px solid;
+  border-color: var(--mc-inv-slot-border) var(--mc-inv-slot-light) var(--mc-inv-slot-light) var(--mc-inv-slot-border);
+  cursor: pointer;
+  position: relative;
+  overflow: hidden;
+  padding: 4px;
+  transition: background 0.05s;
+}
+
+.item-slot:hover {
+  background: #aaa;
+}
+
+.item-slot.selected {
+  background: #b8d4f0;
+  box-shadow: 0 0 0 2px var(--mc-text-aqua);
+}
+
+.item-slot-count {
+  position: absolute;
+  bottom: 2px;
+  right: 3px;
+  color: white;
+  font-size: 0.55rem;
+  font-weight: 700;
+  font-family: 'Silkscreen', 'Courier New', monospace;
+  text-shadow:
+    1px 0 0 var(--mc-dark),
+    -1px 0 0 var(--mc-dark),
+    0 1px 0 var(--mc-dark),
+    0 -1px 0 var(--mc-dark);
+}
+
+.item-slot-name {
+  position: absolute;
+  top: 1px;
+  left: 2px;
+  right: 2px;
+  font-size: 0.35rem;
+  color: var(--mc-text-dark);
+  font-weight: 700;
+  text-align: center;
+  line-height: 1.1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.empty-grid {
+  grid-column: 1 / -1;
+  text-align: center;
+  padding: 2rem;
+  color: var(--mc-text-gray);
+  font-size: 0.75rem;
+}
+
+/* Detail Panel */
+.item-detail-panel {
+  width: 280px;
+  background: #333;
+  border-left: 3px solid var(--mc-dark);
+  padding: 0.75rem;
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+  overflow-y: auto;
+  flex-shrink: 0;
+}
+
+.detail-header {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  padding-bottom: 0.5rem;
+  border-bottom: 2px solid var(--mc-dark);
+}
+
+.detail-info {
+  flex: 1;
+}
+
+.detail-info h3 {
+  font-size: 0.8rem;
+  color: var(--mc-text-white);
+  text-shadow: 1px 1px 0 var(--mc-dark);
+}
+
+.detail-id {
+  font-size: 0.55rem;
+  color: var(--mc-text-gray);
+}
+
+.detail-close {
+  background: none;
+  border: 2px solid #555;
+  color: var(--mc-text-gray);
+  cursor: pointer;
+  font-size: 0.8rem;
+  width: 1.5rem;
+  height: 1.5rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.detail-close:hover {
+  color: var(--mc-text-red);
+  border-color: var(--mc-text-red);
+}
+
+/* Detail stats */
+.detail-stats {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 0.375rem;
+}
+
+.detail-stat {
+  display: flex;
+  flex-direction: column;
+  padding: 0.375rem;
+  background: var(--mc-dark);
+  border: 2px solid #333;
+}
+
+.detail-stat .label {
+  font-size: 0.55rem;
+  color: var(--mc-text-gray);
+  font-weight: 700;
+  text-transform: uppercase;
+}
+
+.detail-stat .value {
+  font-size: 0.8rem;
+  color: var(--mc-text-white);
+  font-weight: 700;
+}
+
+/* Order section */
+.order-section {
+  padding: 0.5rem;
+  background: var(--mc-dark);
+  border: 2px solid #333;
+}
+
+.order-section h4 {
+  font-size: 0.7rem;
+  color: var(--mc-text-gold);
+  margin-bottom: 0.5rem;
+  text-shadow: 1px 1px 0 #000;
+}
+
+.order-controls {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.order-amount-controls {
+  display: flex;
+  gap: 0.25rem;
+  align-items: center;
+}
+
+.order-input {
+  flex: 1;
+  background: #2a2a2a;
+  border: 2px solid #444;
+  color: var(--mc-text-white);
+  font-family: 'Silkscreen', 'Courier New', monospace;
+  font-size: 0.75rem;
+  text-align: center;
+  padding: 0.25rem;
+  outline: none;
+  border-radius: 0;
+}
+
+.order-input:focus {
+  border-color: var(--mc-text-green);
+}
+
+.order-presets {
+  display: flex;
+  gap: 0.25rem;
+  flex-wrap: wrap;
+}
+
+.order-btn {
+  width: 100%;
+  padding: 0.625rem !important;
+  font-size: 0.8rem !important;
+}
+
+/* Responsive */
+@media (max-width: 768px) {
+  .inventory-body {
+    flex-direction: column;
+  }
+
+  .item-detail-panel {
+    width: 100%;
+    border-left: none;
+    border-top: 3px solid var(--mc-dark);
+    max-height: 300px;
+  }
+
+  .item-grid {
+    grid-template-columns: repeat(auto-fill, minmax(65px, 1fr));
+  }
+}
+
+@media (max-width: 480px) {
+  .item-grid {
+    grid-template-columns: repeat(auto-fill, minmax(55px, 1fr));
+    gap: 2px;
+    padding: 4px;
+  }
+}