Remove non-functional headers; lighten text on background image

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/admin/layout.tsx

@@ -22,15 +22,6 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
 
   return (
     <div className="min-h-screen flex flex-col">
-      <header className="bg-white border-b border-gray-200 sticky top-0 z-10">
-        <div className="max-w-5xl mx-auto px-4 h-14 flex items-center justify-between">
-          <span className="font-bold text-blue-600 text-lg">🔧 Taller — Admin</span>
-          <button onClick={cerrarSesion} className="text-sm text-gray-500 hover:text-red-600 transition">
-            Cerrar sesión
-          </button>
-        </div>
-      </header>
-
       <div className="max-w-5xl mx-auto w-full px-4 flex-1 flex flex-col md:flex-row gap-6 py-6">
         <nav className="md:w-48 shrink-0">
           <ul className="flex md:flex-col gap-2 flex-wrap">
@@ -41,7 +32,7 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
                   className={`flex items-center gap-2 px-3 py-2 rounded-lg text-sm font-medium transition ${
                     pathname.startsWith(item.href)
                       ? "bg-blue-600 text-white"
-                      : "text-gray-700 hover:bg-gray-100"
+                      : "text-gray-100 hover:bg-white/20"
                   }`}
                 >
                   <span>{item.icon}</span>
@@ -49,6 +40,14 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
                 </Link>
               </li>
             ))}
+            <li className="md:mt-auto">
+              <button
+                onClick={cerrarSesion}
+                className="flex items-center gap-2 px-3 py-2 rounded-lg text-sm font-medium text-gray-300 hover:text-red-300 hover:bg-white/10 transition w-full"
+              >
+                Cerrar sesión
+              </button>
+            </li>
           </ul>
         </nav>