diff --git a/docs/superpowers/specs/2026-03-17-stats-category-filter-design.md b/docs/superpowers/specs/2026-03-17-stats-category-filter-design.md
new file mode 100644
index 0000000..ccfe2f5
--- /dev/null
+++ b/docs/superpowers/specs/2026-03-17-stats-category-filter-design.md
@@ -0,0 +1,100 @@
+# 统计界面分类筛选功能设计
+
+> **For agentic workers:** REQUIRED: Use superpowers:subagent-driven-development (if subagents available) or superpowers:executing-plans to implement this plan. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** 在统计界面添加分类多选功能，支持按分类筛选查看支出/收入明细
+
+**Architecture:** 在现有统计页面基础上，增加分类多选状态管理，在分类明细区域显示选中分类的标签chips，并过滤显示对应分类的数据
+
+**Tech Stack:** React (Next.js), Chart.js
+
+---
+
+## 需求概述
+
+用户在统计界面可以多选分类，查看特定分类的支出/收入明细。
+
+### 界面布局
+
+```
+┌─────────────────────────────────┐
+│  ← 2026年3月  →              │
+├─────────────────────────────────┤
+│  [周] [月] [年]                │
+│  ┌─────────────────────────┐   │
+│  │     收支趋势折线图       │   │
+│  └─────────────────────────┘   │
+├─────────────────────────────────┤
+│  [支出] [收入]                 │
+│  ┌─────────────────────────┐   │
+│  │ 支出 ¥3200              │   │ ← 切换到支出时显示支出总额
+│  ├─────────────────────────┤   │
+│  │ 餐饮    ████████  500  │   │
+│  │ 交通    ████      300  │   │ ← 分类明细
+│  │ 购物    ██        150  │   │
+│  └─────────────────────────┘   │
+└─────────────────────────────────┘
+```
+
+### 交互逻辑
+
+1. **分类类型切换**：点击「支出」/「收入」tab，显示对应类型的总额 + 分类明细
+2. **分类多选**：
+   - 分类明细区域显示所有分类（可点击）
+   - 点击某个分类 → 添加到已选列表（显示为chip标签）
+   - 点击已选分类的 ✕ 按钮 → 从已选列表移除
+3. **数据过滤**：
+   - 没有选中任何分类 → 显示全部分类
+   - 选中部分分类 → 只显示选中的分类
+4. **总额变化**：根据选中的分类，计算并显示对应分类的总金额
+
+---
+
+## 实现方案
+
+### 需要修改的文件
+
+- `frontend/pages/stats.js` - 主页面逻辑
+
+### 状态管理
+
+```javascript
+// 新增状态
+const [selectedCategories, setSelectedCategories] = useState([]); // 已选中的分类数组
+```
+
+### 逻辑实现
+
+1. **分类点击处理**：
+   - 如果分类已在 selectedCategories 中，忽略
+   - 否则添加到 selectedCategories
+
+2. **移除分类**：
+   - 从 selectedCategories 中过滤掉对应分类
+
+3. **数据过滤**：
+   - 如果 selectedCategories 为空，显示全部 categoryData
+   - 否则过滤只显示 selectedCategories 中的分类
+
+4. **总额计算**：
+   - 根据当前过滤后的数据计算总额
+
+### UI 修改
+
+1. **分类明细区域**：
+   - 在分类明细列表上方添加「总额显示」（如：支出 ¥3200）
+   - 将分类名称改为可点击的 chip 样式
+   - 已选中的分类显示 ✕ 按钮
+
+2. **移除饼图**：按照需求去掉饼图显示
+
+---
+
+## 验收标准
+
+1. 切换「支出」/「收入」tab 时，正确显示对应类型的总额
+2. 点击分类可选中/取消选中，选中的分类显示为 chip 标签
+3. 分类明细只显示选中的分类（如果有选中）
+4. 没有选中分类时，显示全部分类
+5. 总额根据选中的分类动态变化
+6. 页面响应流畅，无明显卡顿
diff --git a/frontend/hooks/useCategories.js b/frontend/hooks/useCategories.js
new file mode 100644
index 0000000..21630f7
--- /dev/null
+++ b/frontend/hooks/useCategories.js
@@ -0,0 +1,45 @@
+import { useState, useEffect } from 'react';
+import { getCategories, isLoggedIn } from '../lib/api';
+import { DEFAULT_CATEGORIES } from '../lib/categories';
+
+export function useCategories() {
+  const [categories, setCategories] = useState(DEFAULT_CATEGORIES);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    if (!isLoggedIn()) {
+      setLoading(false);
+      return;
+    }
+
+    const loadCategories = async () => {
+      try {
+        const categoriesData = await getCategories();
+        if (categoriesData) {
+          setCategories({
+            expense: [
+              ...DEFAULT_CATEGORIES.expense,
+              ...(categoriesData.expense || []).filter(
+                c => !DEFAULT_CATEGORIES.expense.some(d => d.name === c.name)
+              )
+            ],
+            income: [
+              ...DEFAULT_CATEGORIES.income,
+              ...(categoriesData.income || []).filter(
+                c => !DEFAULT_CATEGORIES.income.some(d => d.name === c.name)
+              )
+            ],
+          });
+        }
+      } catch (err) {
+        console.error(err);
+      } finally {
+        setLoading(false);
+      }
+    };
+
+    loadCategories();
+  }, []);
+
+  return { categories, loading };
+}
diff --git a/frontend/pages/recurring.js b/frontend/pages/recurring.js
index dd4c8a1..b337c26 100644
--- a/frontend/pages/recurring.js
+++ b/frontend/pages/recurring.js
@@ -1,16 +1,17 @@
 import { useState, useEffect } from 'react';
 import { useRouter } from 'next/router';
 import { isLoggedIn, getRecurringBills, createRecurringBill, updateRecurringBill, deleteRecurringBill, applyRecurringBill } from '../lib/api';
-import { DEFAULT_CATEGORIES } from '../lib/categories';
 import AppShell from '../components/AppShell';
 import { Icon } from '../components/icons';
 import { useToast } from '../components/ToastProvider';
 import { useConfirm } from '../components/ConfirmProvider';
+import { useCategories } from '../hooks/useCategories';
 
 export default function Recurring() {
   const router = useRouter();
   const { showToast } = useToast();
   const { confirm } = useConfirm();
+  const { categories } = useCategories();
   const [bills, setBills] = useState([]);
   const [modalOpen, setModalOpen] = useState(false);
   const [editingBill, setEditingBill] = useState(null);
@@ -197,8 +198,8 @@ export default function Recurring() {
           </div>
           <div className="bills-list">
             {bills.map((bill) => {
-              const categories = DEFAULT_CATEGORIES[bill.type];
-              const cat = categories.find((item) => item.name === bill.category) || { icon: '📝' };
+              const categoryList = categories[bill.type];
+              const cat = categoryList.find((item) => item.name === bill.category) || { icon: '📝' };
               return (
                 <button
                   key={bill.id}
@@ -304,7 +305,7 @@ export default function Recurring() {
               <div className="form-group">
                 <label>分类</label>
                 <div className="category-grid">
-                  {DEFAULT_CATEGORIES[formData.type].map((cat) => (
+                  {categories[formData.type].map((cat) => (
                     <button
                       key={cat.name}
                       type="button"
diff --git a/frontend/pages/search.js b/frontend/pages/search.js
index 966d790..c263d44 100644
--- a/frontend/pages/search.js
+++ b/frontend/pages/search.js
@@ -1,17 +1,18 @@
 import { useState, useEffect, useMemo } from 'react';
 import { useRouter } from 'next/router';
 import { isLoggedIn, searchRecords, updateRecord, deleteRecord } from '../lib/api';
-import { DEFAULT_CATEGORIES } from '../lib/categories';
 import AppShell from '../components/AppShell';
 import { Icon } from '../components/icons';
 import RecordModal from '../components/RecordModal';
 import { useToast } from '../components/ToastProvider';
 import { useConfirm } from '../components/ConfirmProvider';
+import { useCategories } from '../hooks/useCategories';
 
 export default function Search() {
   const router = useRouter();
   const { showToast } = useToast();
   const confirm = useConfirm();
+  const { categories } = useCategories();
   const [keyword, setKeyword] = useState('');
   const [results, setResults] = useState([]);
   const [loading, setLoading] = useState(false);
@@ -35,6 +36,28 @@ export default function Search() {
     }
   }, [router]);
 
+  // 检查 URL 参数，自动搜索
+  useEffect(() => {
+    if (router.isReady && router.query.q) {
+      const q = decodeURIComponent(router.query.q);
+      setKeyword(q);
+      // 自动搜索
+      const doSearch = async () => {
+        setLoading(true);
+        try {
+          const data = await searchRecords(q);
+          setResults(data);
+        } catch (err) {
+          console.error(err);
+          showToast(err.message, { tone: 'error' });
+        } finally {
+          setLoading(false);
+        }
+      };
+      doSearch();
+    }
+  }, [router.isReady, router.query.q]);
+
   const handleSearch = async (e) => {
     e.preventDefault();
     if (!keyword.trim()) {
@@ -42,6 +65,9 @@ export default function Search() {
       return;
     }
 
+    // 更新 URL
+    router.push(`/search?q=${encodeURIComponent(keyword)}`, undefined, { shallow: true });
+
     setLoading(true);
     try {
       const data = await searchRecords(keyword);
@@ -142,6 +168,7 @@ export default function Search() {
   const formatMoney = (num) => (num || 0).toFixed(2);
 
   const groupedResults = useMemo(() => {
+    if (!Array.isArray(results)) return {};
     return results.reduce((groups, record) => {
       const date = record.date.split(' ')[0];
       if (!groups[date]) groups[date] = [];
@@ -156,6 +183,7 @@ export default function Search() {
   );
 
   const { totalIncome, totalExpense, totalBalance } = useMemo(() => {
+    if (!Array.isArray(results)) return { totalIncome: 0, totalExpense: 0, totalBalance: 0 };
     let income = 0;
     let expense = 0;
     for (const record of results) {
@@ -165,16 +193,16 @@ export default function Search() {
     return { totalIncome: income, totalExpense: expense, totalBalance: income - expense };
   }, [results]);
 
-  // O(1) category icon lookup map
+  // O(1) category icon lookup map (includes custom categories)
   const categoryIconMap = useMemo(() => {
     const icons = {};
     for (const type of ['expense', 'income']) {
-      for (const cat of DEFAULT_CATEGORIES[type]) {
+      for (const cat of categories[type]) {
         icons[`${type}:${cat.name}`] = cat.icon;
       }
     }
     return icons;
-  }, []);
+  }, [categories]);
 
   const actions = (
     <button type="button" className="icon-button" aria-label="设置" onClick={() => router.push('/settings')}>
@@ -209,16 +237,16 @@ export default function Search() {
 
         {results.length > 0 ? (
           <>
-            <div className="search-summary">
-              <div className="search-stat">
+            <div className="stats-grid stats-grid--hero">
+              <div className="stat-card">
                 <span className="label">收入</span>
                 <span className="value income">+{formatMoney(totalIncome)}</span>
               </div>
-              <div className="search-stat">
+              <div className="stat-card">
                 <span className="label">支出</span>
                 <span className="value expense">-{formatMoney(totalExpense)}</span>
               </div>
-              <div className="search-stat">
+              <div className="stat-card stat-card--balance">
                 <span className="label">结余</span>
                 <span className="value">{formatMoney(totalBalance)}</span>
               </div>
@@ -283,7 +311,7 @@ export default function Search() {
         submitting={submitting}
         deleting={deleting}
         editingRecord={editingRecord}
-        categories={DEFAULT_CATEGORIES}
+        categories={categories}
       />
     </AppShell>
   );
diff --git a/frontend/pages/stats.js b/frontend/pages/stats.js
index 298d3d0..e9e6c08 100644
--- a/frontend/pages/stats.js
+++ b/frontend/pages/stats.js
@@ -1,4 +1,4 @@
-import { useState, useEffect, useRef } from 'react';
+import { useState, useEffect, useRef, useMemo } from 'react';
 import { useRouter } from 'next/router';
 import { isLoggedIn, getTrendStats, getCategoryStats } from '../lib/api';
 import { Chart, registerables } from 'chart.js';
@@ -16,12 +16,11 @@ export default function Stats() {
   const [trendData, setTrendData] = useState([]);
   const [categoryData, setCategoryData] = useState([]);
   const [categoryType, setCategoryType] = useState('expense');
+  const [selectedCategories, setSelectedCategories] = useState([]);
   const [trendLoading, setTrendLoading] = useState(true);
   const [categoryLoading, setCategoryLoading] = useState(true);
   const trendChartRef = useRef(null);
-  const categoryChartRef = useRef(null);
   const trendChartInstance = useRef(null);
-  const categoryChartInstance = useRef(null);
 
   useEffect(() => {
     if (!isLoggedIn()) {
@@ -112,35 +111,6 @@ export default function Stats() {
     }
   }, [trendData]);
 
-  useEffect(() => {
-    if (categoryChartInstance.current) {
-      categoryChartInstance.current.destroy();
-    }
-    if (categoryChartRef.current && categoryData.length > 0) {
-      const ctx = categoryChartRef.current.getContext('2d');
-      const colors = ['#2563eb', '#10b981', '#f59e0b', '#ef4444', '#8b5cf6', '#ec4899', '#06b6d4', '#84cc16', '#f97316', '#6366f1'];
-      categoryChartInstance.current = new Chart(ctx, {
-        type: 'doughnut',
-        data: {
-          labels: categoryData.map((item) => item.category),
-          datasets: [{
-            data: categoryData.map((item) => item.total),
-            backgroundColor: colors.slice(0, categoryData.length),
-          }],
-        },
-        options: {
-          responsive: true,
-          maintainAspectRatio: false,
-          plugins: {
-            legend: {
-              position: 'bottom',
-            },
-          },
-        },
-      });
-    }
-  }, [categoryData]);
-
   const prevMonth = () => {
     const newDate = new Date(currentMonth);
     newDate.setMonth(newDate.getMonth() - 1);
@@ -153,7 +123,29 @@ export default function Stats() {
     setCurrentMonth(newDate);
   };
 
-  const totalCategoryAmount = categoryData.reduce((sum, item) => sum + item.total, 0);
+  const handleCategoryTypeChange = (type) => {
+    setCategoryType(type);
+    setSelectedCategories([]); // 切换类型时清空选中
+  };
+
+  const toggleCategory = (categoryName) => {
+    if (selectedCategories.includes(categoryName)) {
+      setSelectedCategories(selectedCategories.filter(c => c !== categoryName));
+    } else {
+      setSelectedCategories([...selectedCategories, categoryName]);
+    }
+  };
+
+  // 根据选中分类过滤数据
+  const filteredCategoryData = useMemo(() => {
+    return selectedCategories.length > 0
+      ? categoryData.filter(cat => selectedCategories.includes(cat.category))
+      : categoryData;
+  }, [selectedCategories, categoryData]);
+
+  const filteredTotalAmount = useMemo(() => {
+    return filteredCategoryData.reduce((sum, item) => sum + item.total, 0);
+  }, [filteredCategoryData]);
 
   const headerContent = (
     <div className="header-center-container">
@@ -201,14 +193,40 @@ export default function Stats() {
           </div>
         </div>
         <div className="category-type-tabs">
-          <button type="button" className={categoryType === 'expense' ? 'active' : ''} onClick={() => setCategoryType('expense')}>支出</button>
-          <button type="button" className={categoryType === 'income' ? 'active' : ''} onClick={() => setCategoryType('income')}>收入</button>
+          <button type="button" className={categoryType === 'expense' ? 'active' : ''} onClick={() => handleCategoryTypeChange('expense')}>支出</button>
+          <button type="button" className={categoryType === 'income' ? 'active' : ''} onClick={() => handleCategoryTypeChange('income')}>收入</button>
         </div>
+
+        {/* 总额显示 */}
+        <div className="stats-total">
+          <span className="stats-total-label">{categoryType === 'expense' ? '支出' : '收入'}</span>
+          <span className="stats-total-amount">¥{filteredTotalAmount.toFixed(2)}</span>
+        </div>
+
+        {/* 分类选择chips */}
+        <div className="category-chips">
+          {categoryData.map((cat) => (
+            <button
+              key={cat.category}
+              type="button"
+              className={`category-chip ${selectedCategories.includes(cat.category) ? 'selected' : ''}`}
+              onClick={() => toggleCategory(cat.category)}
+            >
+              {cat.category}
+            </button>
+          ))}
+        </div>
+
         <div className="category-breakdown category-breakdown--stats">
-          {categoryData.length > 0 ? categoryData.map((cat, index) => {
-            const percent = totalCategoryAmount ? ((cat.total / totalCategoryAmount) * 100).toFixed(1) : '0.0';
+          {filteredCategoryData.length > 0 ? filteredCategoryData.map((cat, index) => {
+            const percent = filteredTotalAmount ? ((cat.total / filteredTotalAmount) * 100).toFixed(1) : '0.0';
             return (
-              <div key={index} className="stats-category-item">
+              <button
+                key={index}
+                type="button"
+                className="stats-category-item stats-category-item--clickable"
+                onClick={() => router.push(`/search?q=${encodeURIComponent(cat.category)}`)}
+              >
                 <div className="stats-category-header">
                   <span className="stats-category-name">{cat.category}</span>
                   <span className="stats-category-amount">{cat.total.toFixed(2)}</span>
@@ -216,7 +234,7 @@ export default function Stats() {
                 <div className="stats-category-bar-wrap">
                   <div className="stats-category-bar" style={{ width: `${percent}%` }}></div>
                 </div>
-              </div>
+              </button>
             );
           }) : <div className="empty-state empty-state--inline">暂无数据</div>}
         </div>
diff --git a/frontend/styles/globals.css b/frontend/styles/globals.css
index 683a75a..ffa133d 100644
--- a/frontend/styles/globals.css
+++ b/frontend/styles/globals.css
@@ -1207,14 +1207,6 @@ textarea:focus-visible {
   gap: 10px;
 }
 
-.search-stat {
-  padding: 13px;
-  background: rgba(246, 248, 252, 0.82);
-  border: 1px solid rgba(148, 163, 184, 0.14);
-  display: grid;
-  gap: 6px;
-}
-
 .section-card--search .results-count {
   padding: 0 2px;
   font-weight: 600;
@@ -1591,6 +1583,18 @@ textarea:focus-visible {
   background: rgba(246, 248, 252, 0.8);
 }
 
+.stats-category-item--clickable {
+  cursor: pointer;
+  border: none;
+  width: 100%;
+  text-align: left;
+  transition: background 0.2s ease;
+}
+
+.stats-category-item--clickable:hover {
+  background: rgba(37, 99, 235, 0.1);
+}
+
 .stats-category-header {
   display: flex;
   justify-content: space-between;
@@ -1622,6 +1626,95 @@ textarea:focus-visible {
   background: linear-gradient(90deg, var(--primary), #60a5fa);
 }
 
+/* 统计页面总额显示 */
+.stats-total {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  background: var(--card-bg);
+  border-radius: 8px;
+  margin-bottom: 12px;
+}
+
+.stats-total-label {
+  font-size: 14px;
+  color: var(--text-secondary);
+}
+
+.stats-total-amount {
+  font-size: 20px;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+/* 分类选择chips */
+.category-chips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+  margin-bottom: 12px;
+}
+
+.category-chip {
+  padding: 6px 12px;
+  border-radius: 16px;
+  border: 1px solid var(--border-color);
+  background: var(--card-bg);
+  color: var(--text-secondary);
+  font-size: 13px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.category-chip:hover {
+  border-color: var(--primary);
+  color: var(--primary);
+}
+
+.category-chip.selected {
+  background: var(--primary);
+  border-color: var(--primary);
+  color: white;
+}
+
+/* 已选分类标签 */
+.selected-chips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+  margin-bottom: 12px;
+}
+
+.selected-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 4px 8px 4px 12px;
+  border-radius: 16px;
+  background: var(--primary);
+  color: white;
+  font-size: 13px;
+}
+
+.selected-chip-remove {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 18px;
+  height: 18px;
+  border-radius: 50%;
+  border: none;
+  background: rgba(255, 255, 255, 0.3);
+  color: white;
+  cursor: pointer;
+  padding: 0;
+}
+
+.selected-chip-remove:hover {
+  background: rgba(255, 255, 255, 0.5);
+}
+
 .category-item .category-name {
   white-space: nowrap;
   overflow: hidden;