diff --git a/App.jsx b/App.jsx
index e7e51c9..ee25b31 100644
--- a/App.jsx
+++ b/App.jsx
@@ -2096,6 +2096,8 @@ function MainApp({ username, onLogout }) {
   const [productDraft, setProductDraft] = useState(null);
   const [productSearch, setProductSearch] = useState('');
   const [productCategoryFilter, setProductCategoryFilter] = useState('all');
+  const [productTypeFilter, setProductTypeFilter] = useState('all');
+  const [productBrandFilter, setProductBrandFilter] = useState('all');
   const [aiImportOpen, setAiImportOpen] = useState(false);
   const [aiImportBusy, setAiImportBusy] = useState(false);
   const [aiImportError, setAiImportError] = useState('');
@@ -2247,9 +2249,29 @@ function MainApp({ username, onLogout }) {
   const vipCustomers = useMemo(() => customers.filter(c => c.isVip), [customers]);
   const normalCustomers = useMemo(() => customers.filter(c => !c.isVip), [customers]);
 
+  const productsInCategory = useMemo(() => (
+    productCategoryFilter === 'all' ? products : products.filter(p => p.category === productCategoryFilter)
+  ), [products, productCategoryFilter]);
+
+  // 可选的"类别"（细分品类，比如高频塔式UPS/工频UPS）跟着"大类"筛选联动收窄；
+  // 可选的"品牌"再跟着"大类+类别"联动收窄，一层层缩小范围
+  const availableProductTypes = useMemo(() => {
+    const set = new Set(productsInCategory.map(p => p.type).filter(Boolean));
+    return [...set].sort();
+  }, [productsInCategory]);
+
+  const productsInCategoryAndType = useMemo(() => (
+    productTypeFilter === 'all' ? productsInCategory : productsInCategory.filter(p => p.type === productTypeFilter)
+  ), [productsInCategory, productTypeFilter]);
+
+  const availableProductBrands = useMemo(() => {
+    const set = new Set(productsInCategoryAndType.map(p => p.brand).filter(Boolean));
+    return [...set].sort();
+  }, [productsInCategoryAndType]);
+
   const filteredProducts = useMemo(() => {
-    let list = products;
-    if (productCategoryFilter !== 'all') list = list.filter(p => p.category === productCategoryFilter);
+    let list = productsInCategoryAndType;
+    if (productBrandFilter !== 'all') list = list.filter(p => p.brand === productBrandFilter);
     if (productSearch.trim()) {
       const q = productSearch.trim().toLowerCase();
       list = list.filter(p =>
@@ -2259,7 +2281,17 @@ function MainApp({ username, onLogout }) {
       );
     }
     return [...list].sort((a, b) => categoryBreadcrumb(a, productCategories).localeCompare(categoryBreadcrumb(b, productCategories)) || (a.name || '').localeCompare(b.name || ''));
-  }, [products, productSearch, productCategoryFilter, productCategories]);
+  }, [productsInCategoryAndType, productBrandFilter, productSearch, productCategories]);
+
+  function handleProductCategoryFilterChange(catId) {
+    setProductCategoryFilter(catId);
+    setProductTypeFilter('all');
+    setProductBrandFilter('all');
+  }
+  function handleProductTypeFilterChange(type) {
+    setProductTypeFilter(type);
+    setProductBrandFilter('all');
+  }
 
   const filteredSuppliers = useMemo(() => {
     let list = suppliers;
@@ -3463,11 +3495,25 @@ function MainApp({ username, onLogout }) {
                 <div>
                   <div className="search-box"><Search size={14} color="var(--ink-soft)" /><input placeholder="搜索型号 / 品牌 / 类别" value={productSearch} onChange={e => setProductSearch(e.target.value)} /></div>
                   <div className="field">
-                    <select className="select" value={productCategoryFilter} onChange={e => setProductCategoryFilter(e.target.value)}>
-                      <option value="all">全部类别</option>
+                    <select className="select" value={productCategoryFilter} onChange={e => handleProductCategoryFilterChange(e.target.value)}>
+                      <option value="all">全部大类</option>
                       {productCategories.map(c => <option key={c.id} value={c.id}>{c.name}</option>)}
                     </select>
                   </div>
+                  <div className="grid-2">
+                    <div className="field">
+                      <select className="select" value={productTypeFilter} onChange={e => handleProductTypeFilterChange(e.target.value)}>
+                        <option value="all">全部类别</option>
+                        {availableProductTypes.map(t => <option key={t} value={t}>{t}</option>)}
+                      </select>
+                    </div>
+                    <div className="field">
+                      <select className="select" value={productBrandFilter} onChange={e => setProductBrandFilter(e.target.value)}>
+                        <option value="all">全部品牌</option>
+                        {availableProductBrands.map(b => <option key={b} value={b}>{b}</option>)}
+                      </select>
+                    </div>
+                  </div>
                   <button className="btn btn-primary" style={{ width: '100%', justifyContent: 'center', marginBottom: 8 }} onClick={startNewProduct}><Plus size={14} />新建产品档案</button>
                   <button className="btn" style={{ width: '100%', justifyContent: 'center', marginBottom: 12 }} onClick={openAiImport}><Sparkles size={14} />AI导入（上传PDF/图片自动建档）</button>
                   <div className="panel">