diff --git a/src/init/i18n/locales/BritishEnglish.json b/src/init/i18n/locales/BritishEnglish.json
index a0716ea..7625722 100644
--- a/src/init/i18n/locales/BritishEnglish.json
+++ b/src/init/i18n/locales/BritishEnglish.json
@@ -7,7 +7,12 @@
   "navigation": {
     "home": "Home",
     "about": "About",
-    "contact": "Contact"
+    "contact": "Contact",
+    "tools": "Tools",
+    "jsonProcessing": "JSON Processing",
+    "dailyTools": "Daily Tools",
+    "expandToolsMenu": "Expand tools menu",
+    "collapseToolsMenu": "Collapse tools menu"
   },
   "language": {
     "switch": "Switch Language",
diff --git a/src/init/i18n/locales/SimplifiedChinese.json b/src/init/i18n/locales/SimplifiedChinese.json
index 79a79ed..0712c82 100644
--- a/src/init/i18n/locales/SimplifiedChinese.json
+++ b/src/init/i18n/locales/SimplifiedChinese.json
@@ -7,7 +7,12 @@
   "navigation": {
     "home": "首页",
     "about": "关于",
-    "contact": "联系"
+    "contact": "联系",
+    "tools": "工具",
+    "jsonProcessing": "JSON 处理",
+    "dailyTools": "日常小工具",
+    "expandToolsMenu": "展开工具菜单",
+    "collapseToolsMenu": "收起工具菜单"
   },
   "language": {
     "switch": "切换语言",
diff --git a/src/layout/tools-layout/index.tsx b/src/layout/tools-layout/index.tsx
new file mode 100644
index 0000000..b3f13f0
--- /dev/null
+++ b/src/layout/tools-layout/index.tsx
@@ -0,0 +1,133 @@
+import { useMemo, useState } from "react"
+import { Link, NavLink, Outlet } from "react-router-dom"
+import { useTranslation } from "react-i18next"
+import dayjs from "dayjs"
+import LanguageSwitcher from "@/components/language-switcher"
+
+export default function ToolsLayout() {
+  const today = useMemo(() => dayjs(), [])
+  const { t } = useTranslation()
+  const [collapsed, setCollapsed] = useState(false)
+
+  const toolGroups = useMemo(
+    () => [
+      {
+        title: t("navigation.jsonProcessing"),
+        items: [
+          { to: "/json-viewer", label: t("home.jsonViewer"), shortLabel: "JV" },
+          { to: "/json-grid", label: t("home.jsonGrid"), shortLabel: "JG" },
+        ],
+      },
+      {
+        title: t("navigation.dailyTools"),
+        items: [{ to: "/bmi-calculator", label: t("home.bmiCalculator"), shortLabel: "BMI" }],
+      },
+    ],
+    [t]
+  )
+
+  return (
+    <div className="h-screen bg-gray-50 flex flex-col overflow-hidden">
+      <header className="bg-white shadow-sm border-b">
+        <div className="px-4">
+          <div className="flex justify-between items-center h-16">
+            <div className="flex items-center">
+              <h1 className="text-xl font-semibold text-gray-900">{t("app.title")}</h1>
+            </div>
+            <div className="flex items-center gap-4">
+              <nav className="flex space-x-8">
+                <Link
+                  to="/"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium"
+                >
+                  {t("navigation.home")}
+                </Link>
+                <Link
+                  to="/about"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium"
+                >
+                  {t("navigation.about")}
+                </Link>
+                <Link
+                  to="/contact"
+                  className="text-gray-500 hover:text-gray-900 px-3 py-2 rounded-md text-sm font-medium"
+                >
+                  {t("navigation.contact")}
+                </Link>
+              </nav>
+              <LanguageSwitcher />
+            </div>
+          </div>
+        </div>
+      </header>
+
+      <main className="flex-1 p-4 overflow-hidden min-h-0">
+        <div className="h-full flex gap-4 overflow-hidden">
+          <aside
+            className={`bg-white rounded-xl shadow-sm border border-slate-200 flex flex-col transition-all duration-200 ${
+              collapsed ? "w-16" : "w-56"
+            }`}
+          >
+            <div className="px-3 py-3 border-b border-slate-200 flex items-center justify-between">
+              {!collapsed && (
+                <span className="text-xs font-semibold uppercase tracking-wider text-slate-500">
+                  {t("navigation.tools")}
+                </span>
+              )}
+              <button
+                type="button"
+                onClick={() => setCollapsed((value) => !value)}
+                className="w-8 h-8 rounded-md border border-slate-200 text-slate-600 hover:bg-slate-50 transition-colours text-sm"
+                aria-label={
+                  collapsed ? t("navigation.expandToolsMenu") : t("navigation.collapseToolsMenu")
+                }
+              >
+                {collapsed ? "»" : "«"}
+              </button>
+            </div>
+
+            <nav className="p-2 flex-1 overflow-auto">
+              {toolGroups.map((group) => (
+                <div key={group.title} className="mb-3 last:mb-0">
+                  {!collapsed && (
+                    <div className="px-3 py-1 text-[11px] font-semibold uppercase tracking-wider text-slate-400">
+                      {group.title}
+                    </div>
+                  )}
+                  {group.items.map((tool) => (
+                    <NavLink
+                      key={tool.to}
+                      to={tool.to}
+                      className={({ isActive }) =>
+                        `w-full flex items-center ${collapsed ? "justify-center" : "justify-start"} rounded-lg px-3 py-2 text-sm font-medium mb-1 transition-colours ${
+                          isActive
+                            ? "bg-indigo-100 text-indigo-700"
+                            : "text-slate-600 hover:bg-slate-100 hover:text-slate-900"
+                        }`
+                      }
+                      title={collapsed ? `${group.title} · ${tool.label}` : tool.label}
+                    >
+                      {collapsed ? tool.shortLabel : tool.label}
+                    </NavLink>
+                  ))}
+                </div>
+              ))}
+            </nav>
+          </aside>
+
+          <section className="flex-1 overflow-hidden min-h-0">
+            <Outlet />
+          </section>
+        </div>
+      </main>
+
+      <footer className="bg-white border-t shrink-0">
+        <div className="max-w-7xl mx-auto py-4 px-4 sm:px-6 lg:px-8">
+          <p className="text-center text-sm text-gray-500">
+            {t("app.copyright", { year: today.year() })}
+          </p>
+        </div>
+      </footer>
+    </div>
+  )
+}
diff --git a/src/router/index.tsx b/src/router/index.tsx
index 3ef5798..30f6f85 100644
--- a/src/router/index.tsx
+++ b/src/router/index.tsx
@@ -2,6 +2,7 @@ import { ComponentType } from "react"
 import { createBrowserRouter } from "react-router-dom"
 import ErrorPage from "@/components/error-page"
 import HeroLayout from "@/layout/hero-layout"
+import ToolsLayout from "@/layout/tools-layout"
 
 function lazy<T extends { default: ComponentType<unknown> }>(importer: () => Promise<T>) {
   return async () => {
@@ -27,6 +28,21 @@ const router = createBrowserRouter(
           index: true,
           lazy: lazy(() => import("@/page/home")),
         },
+        {
+          path: "about",
+          lazy: lazy(() => import("@/page/about")),
+        },
+        {
+          path: "contact",
+          lazy: lazy(() => import("@/page/contact")),
+        },
+      ],
+    },
+    {
+      path: "/",
+      element: <ToolsLayout />,
+      errorElement: <ErrorPage />,
+      children: [
         {
           path: "json-viewer",
           lazy: lazy(() => import("@/page/json-viewer")),
@@ -39,14 +55,6 @@ const router = createBrowserRouter(
           path: "bmi-calculator",
           lazy: lazy(() => import("@/page/bmi-calculator")),
         },
-        {
-          path: "about",
-          lazy: lazy(() => import("@/page/about")),
-        },
-        {
-          path: "contact",
-          lazy: lazy(() => import("@/page/contact")),
-        },
       ],
     },
   ],