diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index e562cde..cbf5ec1 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -8,13 +8,14 @@ import { useAuthContext } from "@/contexts/AuthContext";
 import { createClient } from "@/utils/supabase/client";
 import Avatar from "@/components/Account/Avatar";
 
-function NavLink({ href, label, className = "" }: { href: string; label: React.ReactNode; className?: string }) {
+function NavLink({ href, label, className = "", onClick }: { href: string; label: React.ReactNode; className?: string; onClick?: () => void }) {
   const pathname = usePathname();
   const isActive = pathname === href;
   return (
     <Link
       href={href}
       data-active={isActive || undefined}
+      onClick={onClick}
       className={`group rounded-md px-3 py-2 text-sm transition-colors text-foreground/80 hover:bg-[var(--surface-2)] underline-offset-5 decoration-2 decoration-[var(--accent)] ${
         isActive ? "underline font-semibold" : ""
       } ${className}`}
@@ -32,6 +33,7 @@ export default function Header() {
   const [isAuthenticated, setIsAuthenticated] = React.useState<boolean>(false);
   const [userId, setUserId] = React.useState<string | null>(null);
   const [avatarUrl, setAvatarUrl] = React.useState<string | null>(null);
+  const [isMobileMenuOpen, setIsMobileMenuOpen] = React.useState<boolean>(false);
 
   React.useEffect(() => {
     let isMounted = true;
@@ -58,6 +60,32 @@ export default function Header() {
     };
   }, [supabase, user]);
 
+  // Close mobile menu on route change for better UX
+  React.useEffect(() => {
+    setIsMobileMenuOpen(false);
+  }, [pathname]);
+
+  // Lock background scroll when mobile menu is open
+  React.useEffect(() => {
+    if (isMobileMenuOpen) {
+      const original = document.body.style.overflow;
+      document.body.style.overflow = "hidden";
+      return () => {
+        document.body.style.overflow = original;
+      };
+    }
+  }, [isMobileMenuOpen]);
+
+  // Close on Escape key
+  React.useEffect(() => {
+    if (!isMobileMenuOpen) return;
+    const onKeyDown = (e: KeyboardEvent) => {
+      if (e.key === "Escape") setIsMobileMenuOpen(false);
+    };
+    window.addEventListener("keydown", onKeyDown);
+    return () => window.removeEventListener("keydown", onKeyDown);
+  }, [isMobileMenuOpen]);
+
   return (
     <header className="sticky top-0 z-40 w-full border-b border-[var(--border)] backdrop-blur supports-[backdrop-filter]:bg-background/60">
       <div className="mx-auto flex h-16 max-w-screen-2xl items-center justify-between px-6">
@@ -65,41 +93,118 @@ export default function Header() {
           <div className="h-7 w-7 rounded-md bg-gradient-to-br from-[var(--accent)] to-[var(--accent-700)] ring-1 ring-[var(--border)]" />
           <span className="text-[15px] font-semibold tracking-tight hover:opacity-90 transition-opacity">Hackdex</span>
         </Link>
-        <nav className="hidden items-center gap-2 md:flex">
-          <NavLink href="/discover" label="Discover" />
-          <NavLink
-            href="/roms"
-            label={
-              <span className="inline-flex items-center gap-2">
-                <span className="decoration-2 decoration-[var(--accent)] group-data-active:underline">My Base ROMs</span>
-                <span className="inline-flex items-center rounded-full bg-emerald-600/60 px-2 py-0.5 text-xs text-white font-semibold ring-1 ring-emerald-700/80 dark:bg-emerald-500/20 dark:text-emerald-300 dark:ring-emerald-400/30">
-                  {countReady}
+
+        <div className="flex items-center">
+          <nav className="hidden items-center gap-2 md:flex">
+            <NavLink href="/discover" label="Discover" />
+            <NavLink
+              href="/roms"
+              label={
+                <span className="inline-flex items-center gap-2">
+                  <span className="decoration-2 decoration-[var(--accent)] group-data-active:underline">My Base ROMs</span>
+                  <span className="inline-flex items-center rounded-full bg-emerald-600/60 px-2 py-0.5 text-xs text-white font-semibold ring-1 ring-emerald-700/80 dark:bg-emerald-500/20 dark:text-emerald-300 dark:ring-emerald-400/30">
+                    {countReady}
+                  </span>
                 </span>
-              </span>
-            }
-          />
-          <Link
-            href="/submit"
-            className={`inline-flex h-9 items-center justify-center rounded-md px-3 text-sm font-semibold transition-colors bg-[var(--accent)] text-[var(--accent-foreground)] hover:bg-[var(--accent-700)] ${
-              pathname === "/submit" ? "ring-2 ring-[var(--ring)] ring-offset-2 ring-offset-[var(--background)] brightness-110" : ""
-            }`}
+              }
+            />
+            <NavLink
+              href="/submit"
+              label="Submit"
+              className="inline-flex h-9 items-center justify-center rounded-full font-semibold text-[var(--accent)] ring-1 ring-[var(--accent)] hover:bg-[var(--accent)]/10 focus:outline-none focus:ring-2 focus:ring-[var(--ring)]"
+            />
+            {isAuthenticated && (
+              <Link
+                href="/account"
+                data-active={pathname === "/account" || undefined}
+                className="ml-1 relative group inline-flex items-center justify-center rounded-full ring-1 ring-[var(--border)] p-[2px] data-active:ring-2 data-active:ring-[var(--ring)]"
+                aria-label="Open account"
+                title="Account"
+              >
+                <Avatar uid={userId} url={avatarUrl} size={36} />
+                <div className="absolute inset-0 rounded-full bg-transparent group-hover:bg-black/30 transition-colors m-[2px]" />
+              </Link>
+            )}
+          </nav>
+
+          <button
+            type="button"
+            className="md:hidden inline-flex h-9 w-9 items-center justify-center rounded-md text-foreground/80 hover:bg-[var(--surface-2)] focus:outline-none focus:ring-2 focus:ring-[var(--ring)] ml-2"
+            aria-label={isMobileMenuOpen ? "Close menu" : "Open menu"}
+            aria-expanded={isMobileMenuOpen}
+            aria-controls="mobile-nav"
+            onClick={() => setIsMobileMenuOpen((v) => !v)}
           >
-            Submit
-          </Link>
-          {isAuthenticated && (
-            <Link
-              href="/account"
-              data-active={pathname === "/account" || undefined}
-              className="ml-1 relative group inline-flex items-center justify-center rounded-full ring-1 ring-[var(--border)] p-[2px] data-active:ring-2 data-active:ring-[var(--ring)]"
-              aria-label="Open account"
-              title="Account"
-            >
-              <Avatar uid={userId} url={avatarUrl} size={36} />
-              <div className="absolute inset-0 rounded-full bg-transparent group-hover:bg-black/30 transition-colors m-[2px]" />
-            </Link>
-          )}
-        </nav>
+            {isMobileMenuOpen ? (
+              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" className="h-5 w-5"><path fillRule="evenodd" d="M6.225 4.811a1 1 0 0 1 1.414 0L12 9.172l4.361-4.361a1 1 0 1 1 1.414 1.414L13.414 10.586l4.361 4.361a1 1 0 1 1-1.414 1.414L12 12l-4.361 4.361a1 1 0 0 1-1.414-1.414l4.361-4.361-4.361-4.361a1 1 0 0 1 0-1.414Z" clipRule="evenodd"/></svg>
+            ) : (
+              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" className="h-5 w-5"><path fillRule="evenodd" d="M3.75 6.75A.75.75 0 0 1 4.5 6h15a.75.75 0 0 1 0 1.5h-15a.75.75 0 0 1-.75-.75Zm0 5.25a.75.75 0 0 1 .75-.75h15a.75.75 0 0 1 0 1.5h-15a.75.75 0 0 1-.75-.75Zm.75 4.5a.75.75 0 0 0 0 1.5h15a.75.75 0 0 0 0-1.5h-15Z" clipRule="evenodd"/></svg>
+            )}
+          </button>
+        </div>
       </div>
+
+      {/* Mobile menu panel (animated) */}
+      <div
+        className={`md:hidden fixed inset-x-0 top-16 z-40 border-b border-[var(--border)] bg-background shadow-sm overflow-hidden transition-all duration-200 ease-out ${
+          isMobileMenuOpen ? "max-h-[70vh] opacity-100 translate-y-0" : "max-h-0 opacity-0 -translate-y-1"
+        }`}
+        id="mobile-nav"
+        role="menu"
+        aria-label="Main menu"
+        aria-hidden={!isMobileMenuOpen}
+      >
+        <div className="px-4 py-2 mb-4">
+          <div className="flex flex-col gap-1">
+            <NavLink href="/discover" label="Discover" className="text-[15px] py-3" onClick={() => setIsMobileMenuOpen(false)} />
+            <NavLink
+              href="/roms"
+              className="text-[15px] py-3"
+              onClick={() => setIsMobileMenuOpen(false)}
+              label={
+                <span className="inline-flex items-center gap-2">
+                  <span className="decoration-2 decoration-[var(--accent)] group-data-active:underline">My Base ROMs</span>
+                  <span className="inline-flex items-center rounded-full bg-emerald-600/60 px-2 py-0.5 text-xs text-white font-semibold ring-1 ring-emerald-700/80 dark:bg-emerald-500/20 dark:text-emerald-300 dark:ring-emerald-400/30">
+                    {countReady}
+                  </span>
+                </span>
+              }
+            />
+            <NavLink
+              href="/submit"
+              label="Submit"
+              className="text-[15px] py-3 rounded-full font-semibold text-[var(--accent)] ring-2 ring-[var(--accent)]/20 hover:bg-[var(--accent)]/10"
+              onClick={() => setIsMobileMenuOpen(false)}
+            />
+            {isAuthenticated && (
+              <Link
+                href="/account"
+                onClick={() => setIsMobileMenuOpen(false)}
+                data-active={pathname === "/account" || undefined}
+                className="mt-1 inline-flex items-center gap-3 rounded-md px-3 py-3 ring-1 ring-[var(--border)]"
+                aria-label="Open account"
+                title="Account"
+              >
+                <Avatar uid={userId} url={avatarUrl} size={28} />
+                <span className="text-[15px]">Account</span>
+              </Link>
+            )}
+          </div>
+        </div>
+      </div>
+
+      {/* Scrim overlay */}
+      <button
+        type="button"
+        aria-hidden={!isMobileMenuOpen}
+        aria-label="Close menu"
+        title="Close menu"
+        tabIndex={isMobileMenuOpen ? 0 : -1}
+        className={`md:hidden fixed inset-0 top-16 h-screen z-30 bg-black/50 transition-opacity duration-200 ${
+          isMobileMenuOpen ? "opacity-100 pointer-events-auto" : "opacity-0 pointer-events-none"
+        }`}
+        onClick={() => setIsMobileMenuOpen(false)}
+      />
     </header>
   );
 }