diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index 4111b72..1afdbc6 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -14,7 +14,7 @@
       {
         "title": "Windows 清理工具",
         "width": 1400,
-        "height": 950
+        "height": 900
       }
     ],
     "security": {
diff --git a/src/App.vue b/src/App.vue
index 5f13283..e4887c8 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -29,6 +29,21 @@ const fastScanResult = ref<FastScanResult | null>(null);
 const cleanResult = ref<CleanResult | null>(null);
 const treeData = ref<FileNode[]>([]);
 
+// --- 动态汇总计算 ---
+import { computed } from "vue";
+
+const selectedStats = computed(() => {
+  if (!fastScanResult.value) return { sizeStr: "0 B", count: 0, hasSelection: false };
+  const enabledItems = fastScanResult.value.items.filter(i => i.enabled);
+  const totalBytes = enabledItems.reduce((acc, i) => acc + i.size, 0);
+  const totalCount = enabledItems.reduce((acc, i) => acc + i.count, 0);
+  return {
+    sizeStr: formatItemSize(totalBytes),
+    count: totalCount,
+    hasSelection: enabledItems.length > 0
+  };
+});
+
 // --- 弹窗状态 ---
 const showModal = ref(false);
 const modalTitle = ref("");
@@ -313,19 +328,23 @@ function splitSize(sizeStr: string | number) {
             <div class="result-stats">
               <div class="stat-item">
                 <span class="stat-value">
-                  {{ splitSize(fastScanResult.total_size).value }}
-                  <span class="unit">{{ splitSize(fastScanResult.total_size).unit }}</span>
+                  {{ splitSize(selectedStats.sizeStr).value }}
+                  <span class="unit">{{ splitSize(selectedStats.sizeStr).unit }}</span>
                 </span>
                 <span class="stat-label">预计释放</span>
               </div>
               <div class="stat-divider"></div>
               <div class="stat-item">
-                <span class="stat-value">{{ fastScanResult.total_count }}</span>
+                <span class="stat-value">{{ selectedStats.count }}</span>
                 <span class="stat-label">文件数量</span>
               </div>
             </div>
 
-            <button class="btn-primary main-btn" @click="startFastClean" :disabled="isCleaning">
+            <button 
+              class="btn-primary main-btn" 
+              @click="startFastClean" 
+              :disabled="isCleaning || !selectedStats.hasSelection"
+            >
               {{ isCleaning ? '正在清理...' : '立即清理' }}
             </button>
           </div>