diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index edfc238..d340808 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -1,70 +1,136 @@
-import React, { useState } from 'react';
-import { Menu, X, Anchor } from 'lucide-react';
+import React, { useState, useEffect, useRef } from 'react';
+import { Menu, X, Anchor, BookOpen } from 'lucide-react';
+
+type Page = 'home' | 'musee';
 
 interface HeaderProps {
   scrolled: boolean;
+  currentPage: Page;
+  navigateTo: (page: Page) => void;
 }
 
 const navLinks = [
-  { label: 'Accueil', href: '#accueil' },
-  { label: 'À Propos', href: '#apropos' },
-  { label: 'Histoire', href: '#histoire' },
-  { label: 'Galerie', href: '#galerie' },
+  { label: 'Accueil',     href: '#accueil' },
+  { label: 'À Propos',   href: '#apropos' },
+  { label: 'Histoire',   href: '#histoire' },
+  { label: 'Galerie',    href: '#galerie' },
   { label: 'Événements', href: '#evenements' },
-  { label: 'Contact', href: '#contact' },
+  { label: 'Contact',    href: '#contact' },
 ];
 
-const Header: React.FC<HeaderProps> = ({ scrolled }) => {
+const Header: React.FC<HeaderProps> = ({ scrolled, currentPage, navigateTo }) => {
   const [menuOpen, setMenuOpen] = useState(false);
+  const mobileMenuRef = useRef<HTMLDivElement>(null);
+  const hamburgerRef = useRef<HTMLButtonElement>(null);
+
+  // Close mobile menu on resize to desktop
+  useEffect(() => {
+    const onResize = () => {
+      if (window.innerWidth >= 1024) setMenuOpen(false);
+    };
+    window.addEventListener('resize', onResize);
+    return () => window.removeEventListener('resize', onResize);
+  }, []);
+
+  // Trap focus in mobile menu
+  useEffect(() => {
+    if (!menuOpen) return;
+    const focusable = mobileMenuRef.current?.querySelectorAll<HTMLElement>(
+      'a, button, [tabindex]:not([tabindex="-1"])'
+    );
+    focusable?.[0]?.focus();
+
+    const handleKey = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        setMenuOpen(false);
+        hamburgerRef.current?.focus();
+      }
+    };
+    document.addEventListener('keydown', handleKey);
+    return () => document.removeEventListener('keydown', handleKey);
+  }, [menuOpen]);
 
   const handleNavClick = (href: string) => {
     setMenuOpen(false);
-    const el = document.querySelector(href);
-    if (el) el.scrollIntoView({ behavior: 'smooth' });
+    if (currentPage !== 'home') {
+      navigateTo('home');
+      setTimeout(() => {
+        document.querySelector(href)?.scrollIntoView({ behavior: 'smooth' });
+      }, 100);
+    } else {
+      document.querySelector(href)?.scrollIntoView({ behavior: 'smooth' });
+    }
   };
 
   return (
     <header
-      className={`fixed top-0 left-0 right-0 z-50 transition-all duration-400 ${
+      className={`fixed top-0 left-0 right-0 z-50 transition-all duration-300 ${
         scrolled
           ? 'bg-marine-900 shadow-xl py-2'
-          : 'bg-marine-900/80 backdrop-blur-sm py-4'
+          : 'bg-marine-900/85 backdrop-blur-md py-4'
       }`}
     >
+      {/* Tricolore accent */}
+      <div className="tricolore-bar h-0.5 absolute top-0 left-0 right-0" aria-hidden="true" />
+
       <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 flex items-center justify-between">
         {/* Logo */}
         <a
           href="#accueil"
           onClick={(e) => { e.preventDefault(); handleNavClick('#accueil'); }}
-          className="flex items-center gap-3 group"
-          aria-label="Accueil AATMTC"
+          className="flex items-center gap-3 group focus-visible:ring-2 focus-visible:ring-gold-400 rounded"
+          aria-label="Retour à l'accueil AATMTC"
         >
-          <div className="bg-gold-500 group-hover:bg-gold-400 transition-colors p-2 rounded-sm">
+          <div className="bg-gold-500 group-hover:bg-gold-400 transition-colors p-2 rounded-sm" aria-hidden="true">
             <Anchor className="w-6 h-6 text-white" />
           </div>
           <div className="leading-tight">
             <div className="text-white font-bold text-sm tracking-widest uppercase">AATMTC</div>
-            <div className="text-gold-400 text-xs tracking-wide hidden sm:block">Troupes de Marine · Télégraphistes</div>
+            <div className="text-gold-400 text-xs tracking-wide hidden sm:block">
+              Troupes de Marine · Télégraphistes
+            </div>
           </div>
         </a>
 
         {/* Desktop Nav */}
-        <nav className="hidden lg:flex items-center gap-1" role="navigation" aria-label="Navigation principale">
+        <nav
+          className="hidden lg:flex items-center gap-1"
+          role="navigation"
+          aria-label="Navigation principale"
+        >
           {navLinks.map((link) => (
             <a
               key={link.href}
               href={link.href}
               onClick={(e) => { e.preventDefault(); handleNavClick(link.href); }}
-              className="text-gray-200 hover:text-gold-400 transition-colors px-4 py-2 text-sm font-medium tracking-wide uppercase relative group"
+              className="text-gray-200 hover:text-gold-400 focus-visible:text-gold-400 transition-colors px-3 py-2 text-sm font-medium tracking-wide uppercase relative group rounded"
             >
               {link.label}
-              <span className="absolute bottom-1 left-4 right-4 h-0.5 bg-gold-400 scale-x-0 group-hover:scale-x-100 transition-transform origin-left duration-300" />
+              <span
+                className="absolute bottom-1 left-3 right-3 h-0.5 bg-gold-400 scale-x-0 group-hover:scale-x-100 transition-transform origin-left duration-300"
+                aria-hidden="true"
+              />
             </a>
           ))}
+
+          {/* Museum page link */}
+          <button
+            onClick={() => navigateTo('musee')}
+            className={`ml-2 flex items-center gap-2 px-3 py-2 text-sm font-medium tracking-wide uppercase rounded transition-colors ${
+              currentPage === 'musee'
+                ? 'text-gold-400'
+                : 'text-gray-200 hover:text-gold-400'
+            }`}
+            aria-current={currentPage === 'musee' ? 'page' : undefined}
+          >
+            <BookOpen className="w-4 h-4" aria-hidden="true" />
+            Musée
+          </button>
+
           <a
             href="#contact"
             onClick={(e) => { e.preventDefault(); handleNavClick('#contact'); }}
-            className="ml-4 bg-gold-500 hover:bg-gold-400 text-white text-sm font-semibold px-5 py-2 rounded-sm transition-colors tracking-wide uppercase"
+            className="ml-4 bg-gold-500 hover:bg-gold-600 focus-visible:ring-2 focus-visible:ring-gold-300 focus-visible:ring-offset-2 focus-visible:ring-offset-marine-900 text-white text-sm font-semibold px-5 py-2 rounded-sm transition-colors tracking-wide uppercase"
           >
             Nous rejoindre
           </a>
@@ -72,39 +138,72 @@ const Header: React.FC<HeaderProps> = ({ scrolled }) => {
 
         {/* Mobile Hamburger */}
         <button
-          className="lg:hidden text-white p-2 focus:outline-none focus:ring-2 focus:ring-gold-400 rounded"
+          ref={hamburgerRef}
+          className="lg:hidden text-white p-2 focus-visible:ring-2 focus-visible:ring-gold-400 rounded"
           onClick={() => setMenuOpen(!menuOpen)}
-          aria-label={menuOpen ? 'Fermer le menu' : 'Ouvrir le menu'}
           aria-expanded={menuOpen}
+          aria-controls="mobile-menu"
+          aria-label={menuOpen ? 'Fermer le menu' : 'Ouvrir le menu'}
         >
-          {menuOpen ? <X className="w-6 h-6" /> : <Menu className="w-6 h-6" />}
+          {menuOpen
+            ? <X className="w-6 h-6" aria-hidden="true" />
+            : <Menu className="w-6 h-6" aria-hidden="true" />
+          }
         </button>
       </div>
 
       {/* Mobile Menu */}
       <div
+        id="mobile-menu"
+        ref={mobileMenuRef}
         className={`lg:hidden overflow-hidden transition-all duration-300 ${
-          menuOpen ? 'max-h-screen opacity-100' : 'max-h-0 opacity-0'
+          menuOpen ? 'max-h-[500px] opacity-100' : 'max-h-0 opacity-0'
         }`}
+        aria-hidden={!menuOpen}
       >
-        <nav className="bg-marine-900 border-t border-marine-700 px-4 pb-4 pt-2 flex flex-col gap-1">
-          {navLinks.map((link) => (
-            <a
-              key={link.href}
-              href={link.href}
-              onClick={(e) => { e.preventDefault(); handleNavClick(link.href); }}
-              className="text-gray-200 hover:text-gold-400 hover:bg-marine-800 transition-colors px-4 py-3 text-sm font-medium uppercase tracking-wide rounded"
-            >
-              {link.label}
-            </a>
-          ))}
-          <a
-            href="#contact"
-            onClick={(e) => { e.preventDefault(); handleNavClick('#contact'); }}
-            className="mt-2 bg-gold-500 hover:bg-gold-400 text-white text-sm font-semibold px-4 py-3 rounded-sm text-center uppercase tracking-wide"
-          >
-            Nous rejoindre
-          </a>
+        <nav
+          className="bg-marine-900 border-t border-marine-700 px-4 py-4"
+          aria-label="Navigation mobile"
+        >
+          <ul className="flex flex-col gap-1">
+            {navLinks.map((link) => (
+              <li key={link.href}>
+                <a
+                  href={link.href}
+                  onClick={(e) => { e.preventDefault(); handleNavClick(link.href); }}
+                  className="block text-gray-200 hover:text-gold-400 hover:bg-marine-800 transition-colors px-4 py-3 text-sm font-medium tracking-wide uppercase rounded"
+                  tabIndex={menuOpen ? 0 : -1}
+                >
+                  {link.label}
+                </a>
+              </li>
+            ))}
+            <li>
+              <button
+                onClick={() => { navigateTo('musee'); setMenuOpen(false); }}
+                className={`w-full text-left flex items-center gap-2 px-4 py-3 text-sm font-medium tracking-wide uppercase rounded transition-colors ${
+                  currentPage === 'musee'
+                    ? 'text-gold-400 bg-marine-800'
+                    : 'text-gray-200 hover:text-gold-400 hover:bg-marine-800'
+                }`}
+                tabIndex={menuOpen ? 0 : -1}
+                aria-current={currentPage === 'musee' ? 'page' : undefined}
+              >
+                <BookOpen className="w-4 h-4" aria-hidden="true" />
+                Musée en ligne
+              </button>
+            </li>
+            <li className="pt-2 border-t border-marine-700">
+              <a
+                href="#contact"
+                onClick={(e) => { e.preventDefault(); handleNavClick('#contact'); }}
+                className="block w-full text-center bg-gold-500 hover:bg-gold-600 text-white text-sm font-semibold px-5 py-3 rounded-sm transition-colors tracking-wide uppercase"
+                tabIndex={menuOpen ? 0 : -1}
+              >
+                Nous rejoindre
+              </a>
+            </li>
+          </ul>
         </nav>
       </div>
     </header>