diff --git a/descargar-curso/generar_dashboard.mjs b/descargar-curso/generar_dashboard.mjs
index fdd5536..d365a80 100644
--- a/descargar-curso/generar_dashboard.mjs
+++ b/descargar-curso/generar_dashboard.mjs
@@ -621,23 +621,191 @@ function generarHTML(datos) {
     for (const s of m.secciones) totalTemas += s.temas.length;
   }
 
+  // Leer mapa de videos descargados si existe
+  const mapaVideosPath = path.join(__dirname, ".mapa_videos.json");
+  let videosMap = {};
+  try {
+    if (fs.existsSync(mapaVideosPath)) {
+      videosMap = JSON.parse(fs.readFileSync(mapaVideosPath, "utf-8"));
+    }
+  } catch { /* sin mapa */ }
+
   const css = `
 * { margin: 0; padding: 0; box-sizing: border-box; }
+
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
+
+:root {
+  --sidebar-w: 280px;
+  --color-bg: #f5f3ef;
+  --color-surface: #ffffff;
+  --color-primary: #1a5276;
+  --color-primary-dark: #0d2b3e;
+  --color-accent: #2980b9;
+  --color-text: #2c2c2c;
+  --color-text-muted: #6b7280;
+}
+
 body {
-  font-family: 'Segoe UI', 'Georgia', 'Times New Roman', serif;
-  background: #f5f3ef;
-  color: #2c2c2c;
+  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
+  background: var(--color-bg);
+  color: var(--color-text);
   line-height: 1.8;
-  font-size: 17px;
+  font-size: 16px;
+}
+
+/* ── LAYOUT ── */
+.app-layout {
+  display: flex;
+  min-height: 100vh;
+}
+
+/* ── SIDEBAR ── */
+.sidebar {
+  width: var(--sidebar-w);
+  background: var(--color-primary-dark);
+  color: rgba(255,255,255,0.85);
+  position: fixed;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  overflow-y: auto;
+  z-index: 100;
+  display: flex;
+  flex-direction: column;
+  transition: transform 0.3s ease;
+}
+
+.sidebar-header {
+  padding: 1.5rem 1.2rem 1rem;
+  border-bottom: 1px solid rgba(255,255,255,0.08);
+  flex-shrink: 0;
+}
+
+.sidebar-header .logo {
+  font-size: 1.8rem;
+  margin-bottom: 0.3rem;
+}
+
+.sidebar-header h1 {
+  font-size: 0.95rem;
+  font-weight: 700;
+  line-height: 1.3;
+  margin-bottom: 0.2rem;
+}
+
+.sidebar-header p {
+  font-size: 0.72rem;
+  opacity: 0.5;
+  font-weight: 400;
+}
+
+.sidebar-stats {
+  display: flex;
+  gap: 0.5rem;
+  padding: 0.8rem 1.2rem;
+  border-bottom: 1px solid rgba(255,255,255,0.08);
+  flex-shrink: 0;
+}
+
+.sidebar-stats .stat {
+  background: rgba(255,255,255,0.08);
+  padding: 0.3rem 0.6rem;
+  border-radius: 6px;
+  font-size: 0.7rem;
+  font-weight: 500;
+  flex: 1;
+  text-align: center;
+}
+
+.sidebar-nav {
+  flex: 1;
+  overflow-y: auto;
+  padding: 0.8rem 0;
+}
+
+.sidebar-nav .nav-modulo {
+  padding: 0.6rem 1.2rem 0.3rem;
+  font-size: 0.68rem;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 1px;
+  color: rgba(255,255,255,0.4);
+}
+
+.sidebar-nav a {
+  display: block;
+  padding: 0.45rem 1.2rem 0.45rem 1.6rem;
+  color: rgba(255,255,255,0.7);
+  text-decoration: none;
+  font-size: 0.82rem;
+  font-weight: 400;
+  transition: all 0.2s;
+  border-left: 3px solid transparent;
+}
+
+.sidebar-nav a:hover {
+  background: rgba(255,255,255,0.06);
+  color: white;
+  border-left-color: var(--color-accent);
+}
+
+.sidebar-nav a.active {
+  background: rgba(41,128,185,0.15);
+  color: white;
+  border-left-color: var(--color-accent);
+  font-weight: 600;
+}
+
+.sidebar-nav .nav-count {
+  font-size: 0.65rem;
+  opacity: 0.4;
+  margin-left: 0.3rem;
+}
+
+/* ── HAMBURGER ── */
+.hamburger {
+  display: none;
+  position: fixed;
+  top: 1rem;
+  left: 1rem;
+  z-index: 200;
+  background: var(--color-primary-dark);
+  border: none;
+  color: white;
+  width: 44px;
+  height: 44px;
+  border-radius: 10px;
+  font-size: 1.4rem;
+  cursor: pointer;
+  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
+  transition: transform 0.2s;
+}
+
+.hamburger:hover { transform: scale(1.05); }
+
+.sidebar-overlay {
+  display: none;
+  position: fixed;
+  inset: 0;
+  background: rgba(0,0,0,0.4);
+  z-index: 99;
+}
+
+/* ── MAIN CONTENT ── */
+.main-content {
+  flex: 1;
+  margin-left: var(--sidebar-w);
+  min-width: 0;
 }
 
 /* ── PORTADA ── */
 .portada {
-  background: linear-gradient(135deg, #0d2b3e 0%, #1a5276 50%, #2980b9 100%);
+  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
   color: white;
-  padding: 5rem 2rem;
+  padding: 4rem 2rem;
   text-align: center;
-  min-height: 70vh;
+  min-height: 50vh;
   display: flex;
   flex-direction: column;
   justify-content: center;
@@ -645,141 +813,102 @@ body {
   position: relative;
   overflow: hidden;
 }
+
 .portada::before {
   content: '';
   position: absolute;
-  top: -50%;
-  left: -50%;
-  width: 200%;
-  height: 200%;
+  top: -50%; left: -50%;
+  width: 200%; height: 200%;
   background: radial-gradient(circle at 30% 70%, rgba(255,255,255,0.05) 0%, transparent 50%);
   pointer-events: none;
 }
-.portada h1 { font-size: 2.6rem; margin-bottom: 0.6rem; font-weight: 700; letter-spacing: -0.5px; }
-.portada h2 { font-size: 1.3rem; font-weight: 300; opacity: 0.9; margin-bottom: 1.5rem; }
-.portada p { opacity: 0.7; font-size: 0.95rem; }
-.portada .stats {
-  margin-top: 2rem;
-  display: flex;
-  gap: 1.5rem;
-  flex-wrap: wrap;
-  justify-content: center;
-}
-.portada .stat {
-  background: rgba(255,255,255,0.12);
-  backdrop-filter: blur(4px);
-  padding: 0.6rem 1.4rem;
-  border-radius: 8px;
-  font-size: 0.9rem;
-  border: 1px solid rgba(255,255,255,0.08);
-}
-.portada .icono-grande {
-  font-size: 4rem;
-  margin-bottom: 1rem;
-  opacity: 0.3;
-}
 
-/* ── ÍNDICE ── */
-.indice {
-  background: white;
-  padding: 2.5rem;
-  max-width: 820px;
-  margin: 0 auto;
-  border-bottom: 1px solid #e8e4df;
-}
-.indice h2 {
-  color: #0d2b3e;
-  margin-bottom: 1.5rem;
-  font-size: 1.3rem;
-  display: flex;
-  align-items: center;
-  gap: 0.5rem;
-}
-.indice ul { list-style: none; }
-.indice li { padding: 0.35rem 0; }
-.indice a {
-  color: #1a5276;
-  text-decoration: none;
-  border-bottom: 1px solid transparent;
-  transition: border-color 0.2s;
-}
-.indice a:hover { border-bottom-color: #2980b9; }
-.indice .modulo-titulo {
-  font-weight: 600;
-  font-size: 1.05rem;
-  margin-top: 1rem;
-  padding-top: 0.8rem;
-  border-top: 1px solid #eee;
-  color: #0d2b3e;
-}
-.indice .modulo-titulo:first-child { border-top: none; margin-top: 0; padding-top: 0; }
-.indice .seccion-link { padding-left: 1.2rem; font-size: 0.93rem; }
+.portada .icono-grande { font-size: 4rem; margin-bottom: 1rem; opacity: 0.3; }
+.portada h1 { font-size: 2.4rem; margin-bottom: 0.5rem; font-weight: 800; letter-spacing: -1px; }
+.portada h2 { font-size: 1.15rem; font-weight: 300; opacity: 0.8; margin-bottom: 1rem; }
+.portada p { opacity: 0.6; font-size: 0.9rem; }
 
 /* ── CONTENIDO ── */
 .contenido {
   max-width: 820px;
   margin: 0 auto;
   padding: 2.5rem;
-  background: white;
+  background: var(--color-surface);
+  min-height: 60vh;
 }
+
 .contenido h1.modulo-titulo {
-  color: #0d2b3e;
-  font-size: 2rem;
-  border-bottom: 3px solid #2980b9;
+  color: var(--color-primary-dark);
+  font-size: 1.8rem;
+  font-weight: 800;
+  border-bottom: 3px solid var(--color-accent);
   padding-bottom: 0.5rem;
   margin: 3rem 0 1.5rem;
+  letter-spacing: -0.5px;
 }
+
 .contenido h2.seccion-titulo {
-  color: #1a5276;
-  font-size: 1.5rem;
+  color: var(--color-primary);
+  font-size: 1.35rem;
+  font-weight: 700;
   margin: 2.5rem 0 1rem;
-  border-left: 4px solid #2980b9;
+  border-left: 4px solid var(--color-accent);
   padding-left: 0.8rem;
+  scroll-margin-top: 1rem;
 }
+
 .contenido h3.tema-titulo {
   color: #2c3e50;
-  font-size: 1.15rem;
+  font-size: 1.1rem;
   margin: 1.8rem 0 0.8rem;
   font-weight: 600;
 }
+
 .contenido h4 {
   color: #34495e;
-  font-size: 1.05rem;
+  font-size: 1rem;
   margin: 1.3rem 0 0.6rem;
   font-weight: 600;
 }
+
 .contenido p { margin: 0.8rem 0; text-align: justify; }
 .contenido ul, .contenido ol { margin: 0.8rem 0; padding-left: 1.8rem; }
 .contenido li { margin: 0.4rem 0; }
 .contenido strong { color: #1a3a4a; font-weight: 600; }
+
 .contenido hr {
   border: none;
   border-top: 1px solid #e8e4df;
   margin: 1.8rem 0;
 }
+
 .contenido table {
   width: 100%;
   border-collapse: collapse;
   margin: 1.2rem 0;
-  font-size: 0.9rem;
+  font-size: 0.88rem;
   overflow-x: auto;
   display: block;
 }
+
 .contenido th, .contenido td {
   border: 1px solid #ddd;
   padding: 0.6rem 0.8rem;
   text-align: left;
   vertical-align: top;
 }
+
 .contenido th {
-  background: #0d2b3e;
+  background: var(--color-primary-dark);
   color: white;
   font-weight: 600;
 }
+
 .contenido tr:nth-child(even) { background: #f8f6f3; }
 .contenido tr:hover { background: #efece7; }
+
 .contenido blockquote {
-  border-left: 4px solid #2980b9;
+  border-left: 4px solid var(--color-accent);
   margin: 1rem 0;
   padding: 0.8rem 1.2rem;
   background: #f0f5fa;
@@ -787,6 +916,20 @@ body {
   border-radius: 0 4px 4px 0;
 }
 
+/* ── VIDEO PLAYER ── */
+.video-container {
+  margin: 1rem 0;
+  border-radius: 10px;
+  overflow: hidden;
+  background: #000;
+  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
+}
+
+.video-container video {
+  width: 100%;
+  display: block;
+}
+
 /* ── NOTAS ESPECIALES ── */
 .nota-video {
   background: #fef9e7;
@@ -795,26 +938,26 @@ body {
   padding: 0.6rem 1rem;
   margin: 0.8rem 0;
   border-radius: 0 4px 4px 0;
-  font-size: 0.9rem;
+  font-size: 0.88rem;
   color: #7d6608;
 }
 .nota-recurso {
   background: #eaf2f8;
   border: 1px solid #aed6f1;
-  border-left: 4px solid #2980b9;
+  border-left: 4px solid var(--color-accent);
   padding: 0.6rem 1rem;
   margin: 0.8rem 0;
   border-radius: 0 4px 4px 0;
-  font-size: 0.9rem;
+  font-size: 0.88rem;
 }
 .nota-recurso a {
-  color: #1a5276;
+  color: var(--color-primary);
   font-weight: 600;
 }
 .nota-vacio {
-  color: #999;
+  color: var(--color-text-muted);
   font-style: italic;
-  font-size: 0.9rem;
+  font-size: 0.88rem;
   margin: 0.5rem 0;
 }
 .contenido .tema-separador {
@@ -825,35 +968,38 @@ body {
 /* ── PIE DE PÁGINA ── */
 .footer {
   text-align: center;
-  padding: 3rem 2rem;
-  color: #999;
-  font-size: 0.85rem;
+  padding: 2rem;
+  color: var(--color-text-muted);
+  font-size: 0.8rem;
   max-width: 820px;
   margin: 0 auto;
   border-top: 1px solid #e8e4df;
-  background: white;
+  background: var(--color-surface);
 }
 
 /* ── RESPONSIVE ── */
-@media (max-width: 600px) {
-  body { font-size: 15px; }
-  .portada { padding: 2rem 1rem; min-height: 50vh; }
+@media (max-width: 900px) {
+  .sidebar { transform: translateX(-100%); }
+  .sidebar.open { transform: translateX(0); }
+  .sidebar-overlay.open { display: block; }
+  .hamburger { display: block; }
+  .main-content { margin-left: 0; }
+  .portada { padding: 3rem 1rem 2rem; min-height: 40vh; }
   .portada h1 { font-size: 1.6rem; }
-  .portada h2 { font-size: 1rem; }
-  .contenido { padding: 1rem; }
-  .indice { padding: 1.5rem; }
+  .portada h2 { font-size: 0.95rem; }
+  .contenido { padding: 1.5rem 1rem; }
 }
   `;
 
-  // ─── ÍNDICE ───
-  let indiceHTML = '<div class="indice"><h2>📑 Índice de contenidos</h2><ul>';
+  // ─── SIDEBAR NAV ───
+  let sidebarNav = "";
   for (const modulo of datos) {
-    indiceHTML += `<li class="modulo-titulo">${modulo.titulo}</li>`;
+    sidebarNav += `<div class="nav-modulo">${modulo.titulo.replace(/Módulo \d+ — /i, "")}</div>\n`;
     for (const seccion of modulo.secciones) {
-      indiceHTML += `<li class="seccion-link"><a href="#sec-${slugify(seccion.titulo)}">${seccion.titulo}</a> (${seccion.temas.length} temas)</li>`;
+      const secID = `sec-${slugify(seccion.titulo)}`;
+      sidebarNav += `<a href="#${secID}" data-section="${secID}">${seccion.titulo}<span class="nav-count">${seccion.temas.length}</span></a>\n`;
     }
   }
-  indiceHTML += "</ul></div>";
 
   // ─── CONTENIDO ───
   let bodyHTML = "";
@@ -870,9 +1016,14 @@ body {
 
         bodyHTML += `<h3 class="tema-titulo" id="${temaID}">${t + 1}. ${tema.titulo}</h3>\n`;
 
-        // Video
+        // Video — local player o referencia
         if (tema.vimeoID) {
-          bodyHTML += `<div class="nota-video">📹 <strong>Video disponible</strong> — ID: ${tema.vimeoID}</div>\n`;
+          const videoFile = videosMap[tema.vimeoID];
+          if (videoFile) {
+            bodyHTML += `<div class="video-container"><video controls preload="metadata"><source src="videos_offline/${videoFile}" type="video/mp4">Tu navegador no soporta video HTML5.</video></div>\n`;
+          } else {
+            bodyHTML += `<div class="nota-video">📹 <strong>Video disponible</strong> — Vimeo ID: ${tema.vimeoID}</div>\n`;
+          }
         }
 
         // Contenido de estudio
@@ -885,8 +1036,7 @@ body {
         // Recurso descargable o enlace
         if (tema.recursoURL) {
           const icono = tema.recursoTexto === "Abrir Archivo" ? "📄" : "🔗";
-          const etiqueta =
-            tema.recursoTexto === "Abrir Archivo" ? "Archivo" : "Enlace";
+          const etiqueta = tema.recursoTexto === "Abrir Archivo" ? "Archivo" : "Enlace";
           bodyHTML += `<div class="nota-recurso">${icono} <strong>${etiqueta}:</strong> <a href="${tema.recursoURL}" target="_blank">${tema.titulo}</a></div>\n`;
         }
 
@@ -898,38 +1048,108 @@ body {
     }
   }
 
+  const jsCode = `
+    // Hamburger menu
+    const hamburger = document.getElementById('hamburger');
+    const sidebar = document.getElementById('sidebar');
+    const overlay = document.getElementById('sidebar-overlay');
+
+    hamburger.addEventListener('click', () => {
+      sidebar.classList.toggle('open');
+      overlay.classList.toggle('open');
+    });
+
+    overlay.addEventListener('click', () => {
+      sidebar.classList.remove('open');
+      overlay.classList.remove('open');
+    });
+
+    // Close sidebar on nav click (mobile)
+    sidebar.querySelectorAll('a').forEach(link => {
+      link.addEventListener('click', () => {
+        if (window.innerWidth <= 900) {
+          sidebar.classList.remove('open');
+          overlay.classList.remove('open');
+        }
+      });
+    });
+
+    // Highlight active section on scroll
+    const sections = document.querySelectorAll('.seccion-titulo');
+    const navLinks = document.querySelectorAll('.sidebar-nav a[data-section]');
+
+    const observer = new IntersectionObserver((entries) => {
+      entries.forEach(entry => {
+        if (entry.isIntersecting) {
+          navLinks.forEach(link => link.classList.remove('active'));
+          const id = entry.target.id;
+          const activeLink = document.querySelector('.sidebar-nav a[data-section="' + id + '"]');
+          if (activeLink) {
+            activeLink.classList.add('active');
+            activeLink.scrollIntoView({ block: 'nearest', behavior: 'smooth' });
+          }
+        }
+      });
+    }, { rootMargin: '-10% 0px -80% 0px' });
+
+    sections.forEach(section => observer.observe(section));
+  `;
+
   return `<!DOCTYPE html>
 <html lang="es">
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Curso de Vóley — Material de Estudio</title>
+  <meta name="description" content="Material de estudio offline del Curso de Entrenador Nacional de Vóley">
+  <link rel="preconnect" href="https://fonts.googleapis.com">
+  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap" rel="stylesheet">
   <style>${css}</style>
 </head>
 <body>
-  <div class="portada">
-    <div class="icono-grande">🏐</div>
-    <h1>Curso de Entrenador Nacional de Vóley</h1>
-    <h2>Material de Estudio — Versión Offline</h2>
-    <p>Contenido extraído del campus virtual</p>
-    <div class="stats">
-      <div class="stat">📚 ${totalModulos} módulos</div>
-      <div class="stat">📂 ${totalSecciones} secciones</div>
-      <div class="stat">📖 ${totalTemas} temas</div>
-    </div>
-    <p style="margin-top: 2rem; opacity: 0.5; font-size: 0.8rem;">Generado el ${fecha}</p>
+
+  <button class="hamburger" id="hamburger" aria-label="Menú">☰</button>
+  <div class="sidebar-overlay" id="sidebar-overlay"></div>
+
+  <div class="app-layout">
+    <nav class="sidebar" id="sidebar">
+      <div class="sidebar-header">
+        <div class="logo">🏐</div>
+        <h1>Entrenador Nacional de Vóley</h1>
+        <p>Material de Estudio</p>
+      </div>
+      <div class="sidebar-stats">
+        <div class="stat">📚 ${totalModulos} mód.</div>
+        <div class="stat">📂 ${totalSecciones} secc.</div>
+        <div class="stat">📖 ${totalTemas} temas</div>
+      </div>
+      <div class="sidebar-nav">
+        ${sidebarNav}
+      </div>
+    </nav>
+
+    <main class="main-content">
+      <div class="portada">
+        <div class="icono-grande">🏐</div>
+        <h1>Curso de Entrenador Nacional de Vóley</h1>
+        <h2>Material de Estudio — Versión Offline</h2>
+        <p>Contenido extraído del campus virtual</p>
+        <p style="margin-top: 1.5rem; opacity: 0.4; font-size: 0.75rem;">Generado el ${fecha}</p>
+      </div>
+
+      <div class="contenido">
+        ${bodyHTML}
+      </div>
+
+      <div class="footer">
+        <p>Online Education Center — Material de estudio offline</p>
+        <p style="margin-top: 0.3rem; font-size: 0.75rem;">Generado el ${fecha}</p>
+      </div>
+    </main>
   </div>
 
-  ${indiceHTML}
-
-  <div class="contenido">
-    ${bodyHTML}
-  </div>
-
-  <div class="footer">
-    <p>Online Education Center — Material de estudio offline</p>
-    <p style="margin-top: 0.3rem; font-size: 0.8rem;">Generado el ${fecha}</p>
-  </div>
+  <script>${jsCode}</script>
 </body>
 </html>`;
 }