diff --git a/src/components/ActionMenu.vue b/src/components/ActionMenu.vue
index 2d323db..3cac302 100644
--- a/src/components/ActionMenu.vue
+++ b/src/components/ActionMenu.vue
@@ -3,7 +3,7 @@
     <button class="icon-btn icon-clean" @click="$emit('clean')" :disabled="disabled || poopCount === 0" title="清理"></button>
     <button class="icon-btn icon-medicine" @click="$emit('medicine')" :disabled="disabled || !isSick" title="治療"></button>
     <button class="icon-btn icon-training" @click="$emit('training')" :disabled="disabled" title="祈禱"></button>
-    <button class="icon-btn icon-info" @click="$emit('info')" :disabled="disabled" title="資訊"></button>
+    <button class="icon-btn icon-backpack" @click="$emit('inventory')" :disabled="disabled" title="背包"></button>
   </div>
 </template>
 
@@ -27,7 +27,7 @@ const props = defineProps({
   }
 });
 
-defineEmits(['clean', 'medicine', 'training', 'info']);
+defineEmits(['clean', 'medicine', 'training', 'inventory']);
 </script>
 
 <style scoped>
@@ -116,19 +116,28 @@ defineEmits(['clean', 'medicine', 'training', 'info']);
     -6px 0px 0 #ffcc00, 6px 0px 0 #ffcc00;
 }
 
-/* Info Icon (i) */
-.icon-info::before {
+/* Backpack Icon */
+.icon-backpack::before {
   content: '';
   position: absolute;
   width: 2px;
   height: 2px;
-  background: #4444ff;
+  background: #8d6e63;
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
   box-shadow:
-    0px -6px 0 #4444ff,
-    0px -2px 0 #4444ff, 0px 0px 0 #4444ff,
-    0px 2px 0 #4444ff, 0px 4px 0 #4444ff, 0px 6px 0 #4444ff;
+    /* Top flap */
+    -2px -6px 0 #8d6e63, 0px -6px 0 #8d6e63, 2px -6px 0 #8d6e63,
+    -4px -4px 0 #8d6e63, -2px -4px 0 #a1887f, 0px -4px 0 #a1887f, 2px -4px 0 #a1887f, 4px -4px 0 #8d6e63,
+    
+    /* Body */
+    -4px -2px 0 #8d6e63, -2px -2px 0 #5d4037, 0px -2px 0 #5d4037, 2px -2px 0 #5d4037, 4px -2px 0 #8d6e63,
+    -4px 0px 0 #8d6e63, -2px 0px 0 #5d4037, 0px 0px 0 #5d4037, 2px 0px 0 #5d4037, 4px 0px 0 #8d6e63,
+    -4px 2px 0 #8d6e63, -2px 2px 0 #5d4037, 0px 2px 0 #5d4037, 2px 2px 0 #5d4037, 4px 2px 0 #8d6e63,
+    -4px 4px 0 #8d6e63, -2px 4px 0 #5d4037, 0px 4px 0 #5d4037, 2px 4px 0 #5d4037, 4px 4px 0 #8d6e63,
+    
+    /* Bottom */
+    -2px 6px 0 #8d6e63, 0px 6px 0 #8d6e63, 2px 6px 0 #8d6e63;
 }
 </style>
diff --git a/src/components/InventoryScreen.vue b/src/components/InventoryScreen.vue
new file mode 100644
index 0000000..e7079e2
--- /dev/null
+++ b/src/components/InventoryScreen.vue
@@ -0,0 +1,385 @@
+<template>
+  <div class="inventory-screen" @click.self="$emit('close')">
+    <div class="inventory-container" @click="$emit('close')">
+      <div class="screen-title">背包</div>
+      
+      <div class="inventory-grid">
+        <div 
+          v-for="(item, index) in items" 
+          :key="index"
+          class="inventory-slot"
+          :class="{ 'selected': selectedIndex === index, 'empty': !item }"
+          :draggable="!!item"
+          @dragstart="handleDragStart(index, $event)"
+          @dragover.prevent
+          @drop="handleDrop(index)"
+          @click.stop="selectItem(index)"
+          @mouseenter="item ? handleMouseEnter(item, $event) : null"
+          @mouseleave="handleMouseLeave"
+          @dblclick="item ? useItem() : null"
+        >
+          <template v-if="item">
+            <div class="item-icon" :class="item.iconClass"></div>
+            <div class="item-count" v-if="item.count > 1">x{{ item.count }}</div>
+          </template>
+        </div>
+      </div>
+
+
+    </div>
+
+    <!-- Floating Tooltip -->
+    <div 
+      v-if="hoveredItem" 
+      class="floating-tooltip"
+      :style="tooltipStyle"
+      @mouseenter="cancelHideTooltip"
+      @mouseleave="handleMouseLeave"
+    >
+      <div class="tooltip-name">{{ hoveredItem.name }}</div>
+      <div class="tooltip-desc">{{ hoveredItem.description }}</div>
+      <div class="tooltip-footer">
+        <div class="tooltip-hint">雙擊使用</div>
+        <button class="tooltip-delete-btn" @click.stop="handleDeleteItem(hoveredItem)">
+          <div class="trash-icon-small"></div>
+        </button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref, computed } from 'vue';
+
+const props = defineProps({
+  inventory: {
+    type: Array,
+    default: () => [
+      { id: 'cookie', name: '幸運餅乾', description: '增加一點快樂值', count: 5, iconClass: 'icon-cookie' },
+      { id: 'water', name: '神水', description: '恢復健康', count: 2, iconClass: 'icon-water' },
+      { id: 'amulet', name: '平安符', description: '保佑寵物平安', count: 1, iconClass: 'icon-amulet' }
+    ]
+  }
+});
+
+const emit = defineEmits(['close', 'use-item', 'update:inventory']);
+
+const selectedIndex = ref(-1);
+const draggedIndex = ref(null);
+const isDragging = ref(false);
+
+const items = computed(() => props.inventory);
+const selectedItem = computed(() => {
+  if (selectedIndex.value >= 0 && selectedIndex.value < items.value.length) {
+    return items.value[selectedIndex.value];
+  }
+  return null;
+});
+
+function selectItem(index) {
+  if (items.value[index]) {
+    selectedIndex.value = index;
+  } else {
+    selectedIndex.value = -1;
+  }
+}
+
+// Drag and Drop Logic
+function handleDragStart(index, event) {
+  if (!items.value[index]) return;
+  draggedIndex.value = index;
+  isDragging.value = true;
+  // Set drag image or effect if needed
+  event.dataTransfer.effectAllowed = 'move';
+}
+
+function handleDrop(targetIndex) {
+  isDragging.value = false;
+  if (draggedIndex.value === null) return;
+  
+  const newInventory = [...items.value];
+  const draggedItem = newInventory[draggedIndex.value];
+  const targetItem = newInventory[targetIndex];
+  
+  // Swap items
+  newInventory[draggedIndex.value] = targetItem;
+  newInventory[targetIndex] = draggedItem;
+  
+  emit('update:inventory', newInventory);
+  draggedIndex.value = null;
+}
+
+function handleDeleteItem(item) {
+  const index = items.value.indexOf(item);
+  if (index !== -1) {
+    const newInventory = [...items.value];
+    newInventory[index] = null;
+    emit('update:inventory', newInventory);
+    
+    // Clear hover if deleted
+    if (hoveredItem.value === item) {
+      hoveredItem.value = null;
+    }
+  }
+}
+
+function useItem() {
+  // Use selected item if available, otherwise use hovered item (for double click)
+  const itemToUse = selectedItem.value || hoveredItem.value;
+  if (itemToUse) {
+    emit('use-item', itemToUse);
+  }
+}
+
+// Tooltip Logic
+const hoveredItem = ref(null);
+const tooltipStyle = ref({ top: '0px', left: '0px' });
+let hideTooltipTimeout = null;
+
+function handleMouseEnter(item, event) {
+  cancelHideTooltip();
+  hoveredItem.value = item;
+  updateTooltipPosition(event);
+}
+
+function handleMouseLeave() {
+  // Delay hiding to allow moving to tooltip
+  hideTooltipTimeout = setTimeout(() => {
+    hoveredItem.value = null;
+  }, 200);
+}
+
+function cancelHideTooltip() {
+  if (hideTooltipTimeout) {
+    clearTimeout(hideTooltipTimeout);
+    hideTooltipTimeout = null;
+  }
+}
+
+function updateTooltipPosition(event) {
+  const rect = event.target.getBoundingClientRect();
+  const tooltipWidth = 150; // Estimated width
+  const tooltipHeight = 80; // Estimated height
+  
+  let top = rect.top - 10;
+  let left = rect.left + rect.width / 2;
+  let transform = 'translate(-50%, -100%)';
+
+  // Check top boundary
+  if (top < tooltipHeight) {
+    // Show below if not enough space above
+    top = rect.bottom + 10;
+    transform = 'translate(-50%, 0)';
+  }
+
+  // Check left/right boundary
+  const viewportWidth = window.innerWidth;
+  if (left - tooltipWidth / 2 < 0) {
+    left = tooltipWidth / 2 + 10;
+  } else if (left + tooltipWidth / 2 > viewportWidth) {
+    left = viewportWidth - tooltipWidth / 2 - 10;
+  }
+
+  tooltipStyle.value = {
+    top: top + 'px',
+    left: left + 'px',
+    transform: transform
+  };
+}
+</script>
+
+<style scoped>
+@import url('https://fonts.googleapis.com/css2?family=DotGothic16&display=swap');
+
+.inventory-screen {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: rgba(0, 0, 0, 0.8);
+  z-index: 100;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-family: 'DotGothic16', monospace;
+}
+
+.inventory-container {
+  width: 100%;
+  height: 100%;
+  background: #f0d09c;
+  border: none;
+  padding: 12px;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  overflow-y: auto;
+}
+
+.screen-title {
+  text-align: center;
+  font-size: 20px;
+  font-weight: bold;
+  color: #3d2f1f;
+  border-bottom: 2px dashed #8b4513;
+  padding-bottom: 8px;
+}
+
+.inventory-grid {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 4px;
+  background: #e0b070;
+  padding: 4px;
+  border-radius: 4px;
+  border: 2px solid #c49454;
+}
+
+.inventory-slot {
+  aspect-ratio: 1;
+  background: #f8e8c8;
+  border: 2px solid #c49454;
+  border-radius: 4px;
+  position: relative;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.1s;
+}
+
+.inventory-slot:hover {
+  background: #fff;
+  transform: translateY(-1px);
+}
+
+.inventory-slot.selected {
+  border-color: #d32f2f;
+  background: #fff;
+  box-shadow: 0 0 0 2px #d32f2f;
+}
+
+.inventory-slot.empty {
+  background: rgba(0,0,0,0.05);
+  border-color: rgba(0,0,0,0.1);
+  cursor: default;
+}
+
+.inventory-slot.empty:hover {
+  background: rgba(0,0,0,0.05);
+  transform: none;
+}
+
+.item-count {
+  position: absolute;
+  bottom: 2px;
+  right: 2px;
+  font-size: 10px;
+  color: #333;
+  background: rgba(255,255,255,0.8);
+  padding: 0 2px;
+  border-radius: 2px;
+}
+
+
+
+/* Item Icons (CSS Shapes) */
+.icon-cookie::before {
+  content: '';
+  width: 16px;
+  height: 16px;
+  background: #d4a373;
+  border-radius: 50%;
+  display: block;
+  box-shadow: inset -2px -2px 0 #8b4513;
+}
+
+.icon-water::before {
+  content: '';
+  width: 12px;
+  height: 16px;
+  background: #4fc3f7;
+  border-radius: 40% 40% 40% 40% / 60% 60% 40% 40%;
+  display: block;
+  box-shadow: inset -2px -2px 0 #0288d1;
+}
+
+.icon-amulet::before {
+  content: '';
+  width: 14px;
+  height: 18px;
+  background: #ffeb3b;
+  border: 1px solid #fbc02d;
+  display: block;
+  box-shadow: 0 2px 0 rgba(0,0,0,0.2);
+}
+
+/* Floating Tooltip */
+.floating-tooltip {
+  position: fixed; /* Use fixed to position relative to viewport */
+  background: rgba(0, 0, 0, 0.9);
+  border: 1px solid #fff;
+  padding: 8px;
+  border-radius: 4px;
+  /* pointer-events: none;  <-- Removed to allow clicking button */
+  z-index: 200; /* Above everything */
+  min-width: 120px;
+  max-width: 200px;
+  box-shadow: 0 4px 8px rgba(0,0,0,0.5);
+}
+
+.tooltip-name {
+  color: #ffcc00;
+  font-weight: bold;
+  font-size: 12px;
+  margin-bottom: 2px;
+}
+
+.tooltip-desc {
+  color: #fff;
+  font-size: 10px;
+  line-height: 1.3;
+  margin-bottom: 4px;
+}
+
+.tooltip-footer {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-top: 4px;
+  padding-top: 4px;
+  border-top: 1px dashed #555;
+}
+
+.tooltip-hint {
+  color: #aaa;
+  font-size: 9px;
+  font-style: italic;
+}
+
+.tooltip-delete-btn {
+  background: #d32f2f;
+  border: 1px solid #b71c1c;
+  border-radius: 2px;
+  width: 16px;
+  height: 16px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  padding: 0;
+}
+
+.tooltip-delete-btn:hover {
+  background: #f44336;
+}
+
+.trash-icon-small {
+  width: 10px;
+  height: 10px;
+  background: #fff;
+  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z'/%3E%3C/svg%3E") no-repeat center;
+  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z'/%3E%3C/svg%3E") no-repeat center;
+}
+</style>
diff --git a/src/components/PetGame.vue b/src/components/PetGame.vue
index 59376bb..42ed27f 100644
--- a/src/components/PetGame.vue
+++ b/src/components/PetGame.vue
@@ -179,6 +179,15 @@
       @close="showPetInfo = false"
     />
 
+    <!-- Inventory Screen -->
+    <InventoryScreen
+      v-if="showInventory"
+      :inventory="inventory"
+      @close="showInventory = false"
+      @use-item="handleUseItem"
+      @update:inventory="handleInventoryUpdate"
+    />
+
     <!-- Action Menu (Bottom) -->
     <ActionMenu 
       :disabled="stage === 'egg'"
@@ -188,7 +197,7 @@
       @clean="$emit('action', 'clean')"
       @medicine="$emit('action', 'medicine')"
       @training="showPrayerMenu = true"
-      @info="showPetInfo = !showPetInfo"
+      @inventory="showInventory = !showInventory"
     />
   </div>
 
@@ -206,6 +215,7 @@ import JiaobeiAnimation from './JiaobeiAnimation.vue';
 import FortuneStickAnimation from './FortuneStickAnimation.vue';
 import FortuneResult from './FortuneResult.vue';
 import PetInfoScreen from './PetInfoScreen.vue';
+import InventoryScreen from './InventoryScreen.vue';
 import guanyinLots from '../assets/guanyin_100_lots.json';
 
 const props = defineProps({
@@ -240,19 +250,24 @@ const showJiaobeiAnimation = ref(false);
 const showFortuneStick = ref(false);
 const showFortuneResult = ref(false);
 const currentLotData = ref(null);
+const currentLotNumber = ref(null);
 const consecutiveSaintCount = ref(0);
 const showPetInfo = ref(false);
+const showInventory = ref(false);
+const inventory = ref(new Array(16).fill(null));
+// Initialize some items
+inventory.value[0] = { id: 'cookie', name: '幸運餅乾', description: '增加一點快樂值', count: 5, iconClass: 'icon-cookie' };
+inventory.value[1] = { id: 'water', name: '神水', description: '恢復健康', count: 2, iconClass: 'icon-water' };
+inventory.value[2] = { id: 'amulet', name: '平安符', description: '保佑寵物平安', count: 1, iconClass: 'icon-amulet' };
 const infoPage = ref(0);
 
 const handlePrayerSelect = (mode) => {
-  fortuneMode.value = mode;
   showPrayerMenu.value = false;
   
   if (mode === 'jiaobei') {
+    fortuneMode.value = 'normal';
     showJiaobeiAnimation.value = true;
-  } else if (mode === 'lots') {
-    showFortuneStick.value = true;
-  } else if (type === 'fortune') {
+  } else if (mode === 'fortune') {
     // 開始求籤流程
     fortuneMode.value = 'fortune';
     showFortuneStick.value = true;
@@ -322,6 +337,27 @@ function handleCloseResult() {
   fortuneMode.value = 'normal';
 }
 
+function handleUseItem(item) {
+  console.log('Used item:', item.name);
+  // TODO: Implement item effects
+  
+  // Decrease count or remove item
+  const index = inventory.value.findIndex(i => i === item);
+  if (index !== -1) {
+    if (inventory.value[index].count > 1) {
+      inventory.value[index].count--;
+    } else {
+      inventory.value[index] = null;
+    }
+  }
+  
+  showInventory.value = false;
+}
+
+function handleInventoryUpdate(newInventory) {
+  inventory.value = newInventory;
+}
+
 // Stats visibility toggle (removed local ref, using prop instead)
 
 // Poop position calculator (all on left side, strictly in game area)