diff --git a/src/App.vue b/src/App.vue
index 50e327f..d41ca20 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -29,6 +29,12 @@ const isSettingsOpen = ref(false);
 const isTagManagerOpen = ref(false);
 const isEventModalOpen = ref(false);
 
+const toast = ref({ message: "", type: "success", visible: false });
+const showToast = (message: string, type = "success") => {
+  toast.value = { message, type, visible: true };
+  setTimeout(() => { toast.value.visible = false; }, 3000);
+};
+
 const mergeScreens = ref(false);
 const retainDays = ref(30);
 const captureInterval = ref(30);
@@ -95,24 +101,48 @@ const loadTags = async () => { tags.value = await invoke("get_tags"); };
 const loadEvents = async () => { dayEvents.value = await invoke("get_events", { date: currentDate.value }); };
 
 const handleAddTag = async (name: string, parentId: number | null, color: string) => {
-  await invoke("add_tag", { name, parentId, color });
-  await loadTags();
+  try {
+    await invoke("add_tag", { name, parentId, color });
+    await loadTags();
+    showToast("标签添加成功");
+  } catch (e) {
+    showToast("添加失败: " + e, "error");
+  }
 };
 
 const handleDeleteTag = async (id: number) => {
-  await invoke("delete_tag", { id });
-  await loadTags();
+  try {
+    await invoke("delete_tag", { id });
+    await loadTags();
+    showToast("标签已删除");
+  } catch (e: any) {
+    if (e.toString().includes("FOREIGN KEY")) {
+      showToast("该标签正在被使用，无法删除", "error");
+    } else {
+      showToast("删除失败: " + e, "error");
+    }
+  }
 };
 
 const saveEvent = async () => {
-  await invoke("save_event", { event: editingEvent.value });
-  isEventModalOpen.value = false;
-  await loadEvents();
+  try {
+    await invoke("save_event", { event: editingEvent.value });
+    isEventModalOpen.value = false;
+    await loadEvents();
+    showToast("事件已保存");
+  } catch (e) {
+    showToast("保存失败: " + e, "error");
+  }
 };
 
 const deleteEvent = async (id: number) => {
-  await invoke("delete_event", { id });
-  await loadEvents();
+  try {
+    await invoke("delete_event", { id });
+    await loadEvents();
+    showToast("事件已删除");
+  } catch (e) {
+    showToast("删除失败: " + e, "error");
+  }
 };
 
 const timeToLogicalMinutes = (timeStr: string, isNextDay = false) => {
@@ -336,6 +366,15 @@ const resetTagForm = () => { newTagName.value = ""; newTagParent.value = null; n
     </div>
 
     <div v-if="isFullscreen && previewSrc" class="fixed inset-0 z-[200] bg-black/95 flex items-center justify-center p-6 backdrop-blur-xl"><button @click="isFullscreen = false" class="absolute top-10 right-10 w-12 h-12 bg-white/10 rounded-full flex items-center justify-center"><X :size="32" class="text-white" /></button><img :src="previewSrc" class="max-w-full max-h-full object-contain shadow-2xl" /></div>
+
+    <!-- Toast Notification -->
+    <div v-if="toast.visible" class="fixed bottom-10 left-1/2 -translate-x-1/2 z-[300] animate-in fade-in slide-in-from-bottom-4 duration-300">
+      <div class="px-6 py-3 rounded-2xl shadow-2xl backdrop-blur-md flex items-center gap-3 border border-white/20" :class="toast.type === 'error' ? 'bg-[#FF3B30] text-white' : 'bg-white/90 text-[#1D1D1F]'">
+        <div v-if="toast.type === 'error'" class="w-5 h-5 rounded-full border-2 border-white flex items-center justify-center text-[12px] font-black">!</div>
+        <div v-else class="w-5 h-5 rounded-full bg-[#34C759] flex items-center justify-center text-white text-[10px]">✓</div>
+        <span class="text-sm font-bold">{{ toast.message }}</span>
+      </div>
+    </div>
   </div>
 </template>