diff --git a/roadmap.md b/roadmap.md
index b441a97..36cf70a 100644
--- a/roadmap.md
+++ b/roadmap.md
@@ -115,7 +115,6 @@
 - [x] **Ecosistema de Integración**:
   - [x] **SSO (Single Sign-On)**: Soporte completo OIDC (Google, Okta, Azure AD) (Completado)
   - [x] **LTI 1.3 Tool Provider**: Integración segura con LMS externos como Canvas o Moodle (Completado)
-- [ ] **Apps Móviles**: (Postpuesto por ahora)
 - [ ] **Accesibilidad**: Auditoría y correcciones WCAG 2.1
 
 ## Fase 9: Portabilidad de Cursos ✅
@@ -224,6 +223,6 @@
 **Estado Actual**: La plataforma cuenta con un motor de IA avanzado, gestión multi-tenant completa, tutoría inteligente con memoria histórica, una **interfaz 100% responsiva**, flujos de autenticación diferenciados, **sistema de foros de discusión funcional**, **gestión de anuncios segmentados**, **monetización integrada con Mercado Pago**, **Inscripción Masiva de Usuarios**, **Exportación Avanzada de Calificaciones**, **Librerías de Contenido reutilizables**, **Sistema de Rúbricas Avanzado**, **Secuencias de Aprendizaje**, **Gestión de Equipos Docentes**, **Vista Previa de Cursos**, **Dashboard de Progreso Estudiantil**, **Sistema de Marcadores**, **Biblioteca Global de Activos**, **Interoperabilidad LTI 1.3 con soporte para Deep Linking**, **Analíticas Predictivas de Riesgo de Abandono**, **Integración de Videoconferencia (Jitsi)** y **Portafolios con Perfiles Públicos**.
 
 **Próximas Prioridades**:
-1. **Apps Móviles**: Desarrollo de versiones nativas para iOS y Android.
+1. **Accesibilidad Universal**: Auditoría y ajustes de contraste para cumplimiento WCAG 2.1.
 2. **Integraciones Empresariales**: Conectividad con HRIS y ERPs externos.
 3. **IA Generativa Avanzada**: Generación automática de contenido de video a partir de guiones.
diff --git a/web/experience/src/components/AITutor.tsx b/web/experience/src/components/AITutor.tsx
index fc5ee42..a6b91e6 100644
--- a/web/experience/src/components/AITutor.tsx
+++ b/web/experience/src/components/AITutor.tsx
@@ -17,7 +17,7 @@ export default function AITutor({ lessonId }: { lessonId: string }) {
     const [isLoading, setIsLoading] = useState(false);
     const [isOpen, setIsOpen] = useState(false);
     const [sessionId, setSessionId] = useState<string | null>(null);
-    const scrollRef = useRef<HTMLDivElement>(null);
+    const scrollRef = useRef<HTMLUListElement>(null);
 
     useEffect(() => {
         // Load session from localStorage on mount
@@ -62,19 +62,24 @@ export default function AITutor({ lessonId }: { lessonId: string }) {
             <button
                 onClick={() => setIsOpen(true)}
                 className="fixed bottom-24 right-6 w-14 h-14 rounded-2xl bg-blue-600 text-white shadow-lg shadow-blue-500/40 flex items-center justify-center hover:scale-110 transition-all z-[100] group"
-                title="Abrir Tutor de IA"
+                aria-label="Abrir Tutor de IA"
+                aria-expanded="false"
             >
-                <div className="absolute -top-1 -right-1 w-4 h-4 bg-green-500 border-2 border-black rounded-full animate-pulse" />
-                <MessageSquare className="w-6 h-6 group-hover:rotate-12 transition-transform" />
+                <div className="absolute -top-1 -right-1 w-4 h-4 bg-green-500 border-2 border-black rounded-full animate-pulse" aria-hidden="true" />
+                <MessageSquare className="w-6 h-6 group-hover:rotate-12 transition-transform" aria-hidden="true" />
             </button>
         );
     }
 
     return (
-        <div className="fixed bottom-24 right-6 w-80 md:w-96 h-[500px] glass bg-black/80 backdrop-blur-2xl border border-white/10 rounded-3xl shadow-2xl flex flex-col z-[200] animate-in slide-in-from-bottom-6 duration-500 overflow-hidden">
+        <div
+            className="fixed bottom-24 right-6 w-80 md:w-96 h-[500px] glass bg-black/80 backdrop-blur-2xl border border-white/10 rounded-3xl shadow-2xl flex flex-col z-[200] animate-in slide-in-from-bottom-6 duration-500 overflow-hidden"
+            role="dialog"
+            aria-label="Tutor de IA"
+        >
             {/* Header */}
             <div className="p-4 border-b border-white/5 bg-blue-600/10 flex items-center justify-between">
-                <div className="flex items-center gap-3">
+                <div className="flex items-center gap-3" aria-hidden="true">
                     <div className="w-10 h-10 rounded-xl bg-blue-500 flex items-center justify-center shadow-lg shadow-blue-500/20">
                         <Bot className="w-6 h-6 text-white" />
                     </div>
@@ -89,38 +94,43 @@ export default function AITutor({ lessonId }: { lessonId: string }) {
                 <button
                     onClick={() => setIsOpen(false)}
                     className="p-2 hover:bg-white/5 rounded-lg text-gray-400 hover:text-white transition-colors"
+                    aria-label="Cerrar Tutor de IA"
                 >
                     <X size={20} />
                 </button>
             </div>
 
             {/* Messages */}
-            <div
+            <ul
                 ref={scrollRef}
                 className="flex-1 overflow-y-auto p-4 space-y-4 scrollbar-hide"
+                aria-live="polite"
+                aria-relevant="additions"
             >
                 {messages.map((msg, i) => (
-                    <div
+                    <li
                         key={i}
                         className={`flex ${msg.role === 'user' ? 'justify-end' : 'justify-start'}`}
                     >
                         <div className={`flex gap-2 max-w-[85%] ${msg.role === 'user' ? 'flex-row-reverse' : 'flex-row'}`}>
-                            <div className={`shrink-0 w-8 h-8 rounded-lg flex items-center justify-center ${msg.role === 'user' ? 'bg-white/5' : 'bg-blue-600/20 text-blue-400'}`}>
+                            <div className={`shrink-0 w-8 h-8 rounded-lg flex items-center justify-center ${msg.role === 'user' ? 'bg-white/5' : 'bg-blue-600/20 text-blue-400'}`} aria-hidden="true">
                                 {msg.role === 'user' ? <User size={16} /> : <Bot size={16} />}
                             </div>
                             <div className={`p-3 rounded-2xl text-xs font-medium leading-relaxed ${msg.role === 'user'
                                 ? 'bg-blue-600 text-white rounded-tr-none'
                                 : 'bg-white/5 text-gray-200 border border-white/5 rounded-tl-none'
-                                }`}>
+                                }`}
+                                aria-label={msg.role === 'user' ? 'Tú dijiste' : 'El tutor dijo'}
+                            >
                                 {msg.content}
                             </div>
                         </div>
-                    </div>
+                    </li>
                 ))}
                 {isLoading && (
-                    <div className="flex justify-start animate-in fade-in duration-300">
+                    <li className="flex justify-start animate-in fade-in duration-300" aria-busy="true">
                         <div className="flex gap-2 max-w-[85%]">
-                            <div className="shrink-0 w-8 h-8 rounded-lg bg-blue-600/20 text-blue-400 flex items-center justify-center">
+                            <div className="shrink-0 w-8 h-8 rounded-lg bg-blue-600/20 text-blue-400 flex items-center justify-center" aria-hidden="true">
                                 <Bot size={16} />
                             </div>
                             <div className="bg-white/5 text-gray-400 border border-white/5 p-3 rounded-2xl rounded-tl-none flex items-center gap-2">
@@ -128,9 +138,9 @@ export default function AITutor({ lessonId }: { lessonId: string }) {
                                 <span className="text-[10px] font-bold uppercase tracking-widest">El tutor está pensando...</span>
                             </div>
                         </div>
-                    </div>
+                    </li>
                 )}
-            </div>
+            </ul>
 
             {/* Input */}
             <div className="p-4 border-t border-white/5 bg-black/40">
@@ -141,14 +151,16 @@ export default function AITutor({ lessonId }: { lessonId: string }) {
                         onChange={(e) => setInput(e.target.value)}
                         onKeyDown={(e) => e.key === 'Enter' && handleSend()}
                         placeholder="Escribe tu duda aquí..."
+                        aria-label="Escribe tu duda para el tutor"
                         className="w-full bg-white/5 border border-white/10 rounded-xl py-3 px-4 pr-12 text-xs font-medium focus:outline-none focus:border-blue-500/50 transition-colors placeholder:text-gray-600"
                     />
                     <button
                         onClick={handleSend}
                         disabled={isLoading || !input.trim()}
                         className="absolute right-2 top-1.5 p-1.5 bg-blue-600 text-white rounded-lg disabled:opacity-50 disabled:bg-gray-600 transition-all hover:bg-blue-500"
+                        aria-label="Enviar mensaje"
                     >
-                        <Send size={16} />
+                        <Send size={16} aria-hidden="true" />
                     </button>
                 </div>
                 <p className="mt-2 text-[9px] text-gray-600 font-bold uppercase tracking-widest text-center">
diff --git a/web/experience/src/components/AppHeader.tsx b/web/experience/src/components/AppHeader.tsx
index d033d27..524f725 100644
--- a/web/experience/src/components/AppHeader.tsx
+++ b/web/experience/src/components/AppHeader.tsx
@@ -22,12 +22,12 @@ export default function AppHeader() {
 
     return (
         <header className="h-16 glass sticky top-0 z-[100] px-4 md:px-6 flex items-center justify-between backdrop-blur-xl bg-black/40 border-b border-white/5">
-            <Link href="/" className="flex items-center gap-2 md:gap-3 group">
+            <Link href="/" className="flex items-center gap-2 md:gap-3 group" aria-label={`${platformName} - Dashboard`}>
                 <div className="w-8 h-8 md:w-10 md:h-10 rounded-lg md:rounded-xl bg-blue-600 flex items-center justify-center font-black text-white shadow-lg shadow-blue-500/20 group-hover:scale-105 transition-all overflow-hidden relative">
                     {branding?.logo_url ? (
                         <Image src={getImageUrl(branding.logo_url)} alt={branding.name} fill className="object-contain" sizes="40px" />
                     ) : (
-                        <div className="absolute inset-0 flex items-center justify-center bg-gradient-to-br from-blue-500 to-blue-700">
+                        <div className="absolute inset-0 flex items-center justify-center bg-gradient-to-br from-blue-500 to-blue-700" aria-hidden="true">
                             {platformName.charAt(0).toUpperCase()}
                         </div>
                     )}
@@ -62,10 +62,12 @@ export default function AppHeader() {
                     <NotificationCenter />
 
                     <div className="hidden sm:flex items-center gap-2 border-l border-white/10 pl-4">
-                        <Globe size={14} className="text-gray-500" />
+                        <Globe size={14} className="text-gray-500" aria-hidden="true" />
                         <select
+                            id="language-selector"
                             value={language}
                             onChange={(e) => setLanguage(e.target.value)}
+                            aria-label={t('nav.selectLanguage') || 'Select Language'}
                             className="bg-transparent text-[10px] font-black uppercase tracking-widest text-gray-500 hover:text-white transition-colors focus:outline-none cursor-pointer"
                         >
                             <option value="en" className="bg-[#0f1115]">EN</option>
@@ -84,6 +86,7 @@ export default function AppHeader() {
                             onClick={logout}
                             className="p-2 hover:bg-red-500/10 rounded-full text-gray-400 hover:text-red-400 transition-colors"
                             title={t('nav.signOut')}
+                            aria-label={t('nav.signOut')}
                         >
                             <LogOut size={16} />
                         </button>
@@ -93,6 +96,8 @@ export default function AppHeader() {
                     <button
                         onClick={() => setIsMenuOpen(!isMenuOpen)}
                         className="md:hidden p-2 hover:bg-white/5 rounded-lg text-gray-400 transition-colors"
+                        aria-label={isMenuOpen ? "Close menu" : "Open menu"}
+                        aria-expanded={isMenuOpen}
                     >
                         {isMenuOpen ? <X size={24} /> : <Menu size={24} />}
                     </button>
@@ -105,7 +110,11 @@ export default function AppHeader() {
                     <div className="absolute right-0 top-0 bottom-0 w-64 glass border-l border-white/10 p-6 flex flex-col animate-in slide-in-from-right duration-300">
                         <div className="flex justify-between items-center mb-8">
                             <span className="font-black text-xs uppercase tracking-[0.2em] text-gray-500">Menú</span>
-                            <button onClick={() => setIsMenuOpen(false)} className="p-2 hover:bg-white/5 rounded-lg">
+                            <button
+                                onClick={() => setIsMenuOpen(false)}
+                                className="p-2 hover:bg-white/5 rounded-lg"
+                                aria-label="Close menu"
+                            >
                                 <X size={20} />
                             </button>
                         </div>
@@ -144,10 +153,12 @@ export default function AppHeader() {
 
                             <div className="pt-6 mt-6 border-t border-white/5 space-y-4">
                                 <div className="flex items-center gap-3 px-4 py-2 rounded-xl bg-white/5">
-                                    <Globe size={16} className="text-gray-500" />
+                                    <Globe size={16} className="text-gray-500" aria-hidden="true" />
                                     <select
+                                        id="mobile-language-selector"
                                         value={language}
                                         onChange={(e) => setLanguage(e.target.value)}
+                                        aria-label={t('nav.selectLanguage') || 'Select Language'}
                                         className="bg-transparent text-xs font-bold uppercase tracking-widest text-gray-300 focus:outline-none flex-1"
                                     >
                                         <option value="en" className="bg-[#0f1115]">English</option>
diff --git a/web/experience/src/components/NotificationCenter.tsx b/web/experience/src/components/NotificationCenter.tsx
index ebbb49f..4e3a716 100644
--- a/web/experience/src/components/NotificationCenter.tsx
+++ b/web/experience/src/components/NotificationCenter.tsx
@@ -60,10 +60,16 @@ export default function NotificationCenter() {
             <button
                 onClick={() => setIsOpen(!isOpen)}
                 className="relative p-2 rounded-xl glass border-white/10 text-gray-400 hover:text-white transition-all hover:bg-white/5"
+                aria-label={`Notifications ${unreadCount > 0 ? `(${unreadCount} unread)` : ''}`}
+                aria-haspopup="true"
+                aria-expanded={isOpen}
             >
-                <Bell size={20} />
+                <Bell size={20} aria-hidden="true" />
                 {unreadCount > 0 && (
-                    <span className="absolute top-0 right-0 w-5 h-5 bg-red-500 text-white text-[10px] font-black rounded-full flex items-center justify-center border-2 border-[#1a1c20] -translate-to-1/4">
+                    <span
+                        className="absolute top-0 right-0 w-5 h-5 bg-red-500 text-white text-[10px] font-black rounded-full flex items-center justify-center border-2 border-[#1a1c20] -translate-to-1/4"
+                        aria-hidden="true"
+                    >
                         {unreadCount}
                     </span>
                 )}
@@ -72,10 +78,18 @@ export default function NotificationCenter() {
             {isOpen && (
                 <>
                     <div className="fixed inset-0 z-40" onClick={() => setIsOpen(false)} />
-                    <div className="absolute right-0 mt-4 w-96 glass-card border-white/10 z-50 shadow-2xl animate-in fade-in zoom-in-95 duration-200 overflow-hidden bg-[#1a1c20]/95 backdrop-blur-xl">
+                    <div
+                        className="absolute right-0 mt-4 w-96 glass-card border-white/10 z-50 shadow-2xl animate-in fade-in zoom-in-95 duration-200 overflow-hidden bg-[#1a1c20]/95 backdrop-blur-xl"
+                        role="dialog"
+                        aria-label="Notifications Panel"
+                    >
                         <div className="p-4 border-b border-white/5 flex items-center justify-between bg-white/5">
                             <h3 className="text-sm font-black uppercase tracking-widest text-white">Notificaciones</h3>
-                            <button onClick={() => setIsOpen(false)} className="text-gray-500 hover:text-white p-1">
+                            <button
+                                onClick={() => setIsOpen(false)}
+                                className="text-gray-500 hover:text-white p-1"
+                                aria-label="Close notifications"
+                            >
                                 <X size={18} />
                             </button>
                         </div>
@@ -86,15 +100,23 @@ export default function NotificationCenter() {
                             ) : notifications.length === 0 ? (
                                 <div className="p-12 text-center text-gray-500 text-xs font-bold uppercase tracking-widest italic">No hay notificaciones</div>
                             ) : (
-                                <div className="divide-y divide-white/5">
+                                <ul className="divide-y divide-white/5">
                                     {notifications.map((n) => (
-                                        <div
+                                        <li
                                             key={n.id}
-                                            className={`p-4 hover:bg-white/5 transition-all group ${!n.is_read ? 'bg-blue-500/5' : ''}`}
+                                            role="button"
+                                            tabIndex={0}
+                                            className={`p-4 hover:bg-white/5 transition-all group cursor-pointer outline-none focus:bg-white/5 ${!n.is_read ? 'bg-blue-500/5' : ''}`}
                                             onClick={() => !n.is_read && markAsRead(n.id)}
+                                            onKeyDown={(e) => {
+                                                if (e.key === 'Enter' || e.key === ' ') {
+                                                    !n.is_read && markAsRead(n.id);
+                                                }
+                                            }}
+                                            aria-label={`Notification: ${n.title}. ${n.message}`}
                                         >
                                             <div className="flex gap-4">
-                                                <div className="mt-1">{getIcon(n.notification_type)}</div>
+                                                <div className="mt-1" aria-hidden="true">{getIcon(n.notification_type)}</div>
                                                 <div className="flex-1 space-y-1">
                                                     <p className="text-sm font-bold text-white leading-tight">{n.title}</p>
                                                     <p className="text-xs text-gray-400 leading-relaxed">{n.message}</p>
@@ -106,7 +128,10 @@ export default function NotificationCenter() {
                                                             <Link
                                                                 href={n.link_url}
                                                                 className="text-[10px] font-black uppercase tracking-widest text-blue-400 hover:text-blue-300 flex items-center gap-1"
-                                                                onClick={() => setIsOpen(false)}
+                                                                onClick={(e) => {
+                                                                    e.stopPropagation();
+                                                                    setIsOpen(false);
+                                                                }}
                                                             >
                                                                 Ver detalles →
                                                             </Link>
@@ -114,9 +139,9 @@ export default function NotificationCenter() {
                                                     </div>
                                                 </div>
                                             </div>
-                                        </div>
+                                        </li>
                                     ))}
-                                </div>
+                                </ul>
                             )}
                         </div>
 
diff --git a/web/experience/src/components/blocks/QuizPlayer.tsx b/web/experience/src/components/blocks/QuizPlayer.tsx
index 176f808..810b8c1 100644
--- a/web/experience/src/components/blocks/QuizPlayer.tsx
+++ b/web/experience/src/components/blocks/QuizPlayer.tsx
@@ -76,9 +76,13 @@ export default function QuizPlayer({ id, title, quizData, allowRetry = true, max
 
             <div className="space-y-8">
                 {questions.map((q) => (
-                    <div key={q.id} className="space-y-4 p-8 glass border-white/5 rounded-3xl">
-                        <h4 className="font-bold text-xl text-gray-100 leading-tight">{q.question}</h4>
-                        <div className="grid gap-3">
+                    <fieldset key={q.id} className="space-y-4 p-8 glass border-white/5 rounded-3xl" aria-labelledby={`q-${q.id}-text`}>
+                        <legend id={`q-${q.id}-text`} className="font-bold text-xl text-gray-100 leading-tight mb-4">{q.question}</legend>
+                        <div
+                            className="grid gap-3"
+                            role={q.type === 'multiple-select' ? 'group' : 'radiogroup'}
+                            aria-label="Opciones de respuesta"
+                        >
                             {q.options.map((opt, oIdx) => {
                                 const isSelected = userAnswers[q.id]?.includes(oIdx);
                                 const isCorrect = q.correct?.includes(oIdx);
@@ -99,20 +103,27 @@ export default function QuizPlayer({ id, title, quizData, allowRetry = true, max
                                 return (
                                     <button
                                         key={oIdx}
+                                        role={q.type === 'multiple-select' ? 'checkbox' : 'radio'}
+                                        aria-checked={isSelected}
+                                        aria-disabled={submitted}
                                         onClick={() => handleAnswer(q.id, oIdx, q.type === 'multiple-select')}
-                                        className={`p-5 rounded-xl border transition-all text-left text-sm font-bold ${style}`}
+                                        className={`p-5 rounded-xl border transition-all text-left text-sm font-bold outline-none focus:ring-2 focus:ring-blue-500/50 ${style}`}
                                     >
                                         <div className="flex items-center justify-between">
                                             <span>{opt}</span>
-                                            {submitted && isActuallyCorrect && <span>✅</span>}
-                                            {submitted && isWrongSelection && <span>❌</span>}
-                                            {submitted && missedCorrect && <span className="text-[10px] uppercase font-black tracking-tighter">Respuesta Correcta</span>}
+                                            {submitted && (
+                                                <div className="flex items-center gap-2">
+                                                    {isActuallyCorrect && <span role="img" aria-label="Correcto">✅</span>}
+                                                    {isWrongSelection && <span role="img" aria-label="Incorrecto">❌</span>}
+                                                    {missedCorrect && <span className="text-[10px] uppercase font-black tracking-tighter text-orange-400">Respuesta Correcta</span>}
+                                                </div>
+                                            )}
                                         </div>
                                     </button>
                                 );
                             })}
                         </div>
-                    </div>
+                    </fieldset>
                 ))}
 
                 {allowRetry && (