diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index 9d387b6..3ab682a 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -1,39 +1,73 @@
-import Link from "next/link";
-
-const links = [
-  { href: "/", label: "Home" },
-  { href: "/pairs", label: "Pairs" },
-  { href: "/quote", label: "Quote" },
-  { href: "/stats", label: "Stats" },
-  { href: "/admin", label: "Admin" },
-];
-
-export function Header() {
-  return (
-    <header className="border-b border-neutral-200 dark:border-neutral-800">
-      <nav
-        aria-label="Main navigation"
-        className="mx-auto flex max-w-5xl items-center justify-between p-4"
-      >
-        <Link
-          href="/"
-          className="text-lg font-semibold focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-blue-500"
-        >
-          StableRoute
-        </Link>
-        <ul className="flex gap-4 text-sm">
-          {links.map((l) => (
-            <li key={l.href}>
-              <Link
-                href={l.href}
-                className="rounded px-2 py-1 hover:bg-neutral-100 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-blue-500 dark:hover:bg-neutral-800"
-              >
-                {l.label}
-              </Link>
-            </li>
-          ))}
-        </ul>
-      </nav>
-    </header>
-  );
-}
+"use client";
+
+import Link from "next/link";
+import { usePathname } from "next/navigation";
+import { useState } from "react";
+import { ThemeToggle } from "@/components/ThemeToggle";
+import { ROUTES } from "@/lib/routes";
+
+const navLinks = [
+  ROUTES.home,
+  ROUTES.pairs,
+  ROUTES.quote,
+  ROUTES.stats,
+  ROUTES.admin,
+  ROUTES.events,
+  ROUTES.webhooks,
+  ROUTES.apiKeys,
+  ROUTES.settings,
+  ROUTES.docs,
+];
+
+export function Header() {
+  const pathname = usePathname();
+  const [mobileOpen, setMobileOpen] = useState(false);
+
+  return (
+    <header className="border-b border-neutral-200 dark:border-neutral-800">
+      <div className="mx-auto flex max-w-5xl items-center justify-between gap-3 p-4">
+        <Link
+          href="/"
+          className="text-lg font-semibold focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-blue-500"
+        >
+          StableRoute
+        </Link>
+        <div className="flex items-center gap-2">
+          <ThemeToggle />
+          <button
+            type="button"
+            className="rounded border border-neutral-300 px-3 py-1 text-sm md:hidden dark:border-neutral-700"
+            aria-expanded={mobileOpen}
+            aria-controls="main-nav"
+            onClick={() => setMobileOpen((open) => !open)}
+          >
+            {mobileOpen ? "Close" : "Menu"}
+          </button>
+        </div>
+      </div>
+      <nav
+        id="main-nav"
+        aria-label="Main navigation"
+        className={`mx-auto max-w-5xl px-4 pb-4 ${mobileOpen ? "block" : "hidden md:block"}`}
+      >
+        <ul className="flex flex-col gap-1 md:flex-row md:flex-wrap md:gap-3 md:text-sm">
+          {navLinks.map((link) => {
+            const active = pathname === link.href;
+            return (
+              <li key={link.href}>
+                <Link
+                  href={link.href}
+                  aria-current={active ? "page" : undefined}
+                  className="block rounded px-2 py-1 hover:bg-neutral-100 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-blue-500 dark:hover:bg-neutral-800"
+                  onClick={() => setMobileOpen(false)}
+                >
+                  {link.title}
+                </Link>
+              </li>
+            );
+          })}
+        </ul>
+      </nav>
+    </header>
+  );
+}
diff --git a/src/lib/routes.ts b/src/lib/routes.ts
new file mode 100644
index 0000000..aed560b
--- /dev/null
+++ b/src/lib/routes.ts
@@ -0,0 +1,12 @@
+export const ROUTES = {
+  home: { href: "/", title: "Home", description: "StableRoute dashboard landing page." },
+  pairs: { href: "/pairs", title: "Pairs", description: "Manage registered routing pairs." },
+  quote: { href: "/quote", title: "Quote", description: "Request routing quotes." },
+  stats: { href: "/stats", title: "Stats", description: "View router metrics." },
+  admin: { href: "/admin", title: "Admin", description: "Pause or resume the router." },
+  events: { href: "/events", title: "Events", description: "Inspect router event log." },
+  webhooks: { href: "/webhooks", title: "Webhooks", description: "Register webhook endpoints." },
+  apiKeys: { href: "/api-keys", title: "API keys", description: "Manage operator API keys." },
+  settings: { href: "/settings", title: "Settings", description: "Appearance and API configuration." },
+  docs: { href: "/docs", title: "Docs", description: "HTTP API reference." },
+} as const;