/* =====================================================
   Curso de Vóley — Material de Estudio
   Estilos principales
   ===================================================== */

* { 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: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  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, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.portada::before {
  content: '';
  position: absolute;
  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 .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: var(--color-surface);
  min-height: 60vh;
}

.contenido h1.modulo-titulo {
  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: var(--color-primary);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  border-left: 4px solid var(--color-accent);
  padding-left: 0.8rem;
  scroll-margin-top: 1rem;
}

.contenido h3.tema-titulo {
  color: #2c3e50;
  font-size: 1.1rem;
  margin: 1.8rem 0 0.8rem;
  font-weight: 600;
}

.contenido h4 {
  color: #34495e;
  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: 0.88rem;
  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: 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 var(--color-accent);
  margin: 1rem 0;
  padding: 0.8rem 1.2rem;
  background: #f0f5fa;
  color: #2c3e50;
  border-radius: 0 4px 4px 0;
}

/* ── VIDEO PLAYER ── */
.video-viewer-wrap {
  margin: 1rem 0;
  border: 1px solid #2c3e50;
  border-radius: 8px;
  overflow: hidden;
  background: #1a1a2e;
}
.video-viewer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.7rem 1rem;
  background: linear-gradient(135deg, #1a1a2e, #16213e);
  color: #eee;
  cursor: pointer;
  user-select: none;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.video-viewer-header:hover {
  background: linear-gradient(135deg, #16213e, #0f3460);
}
.video-toggle {
  transition: transform 0.3s;
  font-size: 0.8rem;
  opacity: 0.6;
  color: #aaa;
}
.video-viewer-wrap.collapsed .video-toggle {
  transform: rotate(-90deg);
}
.video-viewer-wrap.collapsed .video-container,
.video-viewer-wrap.collapsed .video-placeholder {
  display: none;
}
.video-container {
  border-radius: 0;
  overflow: hidden;
  background: #000;
}
.video-container video {
  width: 100%;
  display: block;
}

/* ── NOTAS ESPECIALES ── */
.nota-video {
  background: #fef9e7;
  border: 1px solid #f9e79f;
  border-left: 4px solid #f1c40f;
  padding: 0.6rem 1rem;
  margin: 0.8rem 0;
  border-radius: 0 4px 4px 0;
  font-size: 0.88rem;
  color: #7d6608;
}
.video-placeholder {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  border-radius: 8px;
  padding: 2rem;
  margin: 1rem 0;
  text-align: center;
  color: #e0e0e0;
  position: relative;
  overflow: hidden;
}
.video-placeholder::before {
  content: '';
  position: absolute;
  top: 0; left: -100%; width: 200%; height: 100%;
  background: linear-gradient(90deg, transparent 25%, rgba(255,255,255,0.03) 50%, transparent 75%);
  animation: shimmer 3s infinite;
}
@keyframes shimmer {
  0% { transform: translateX(-50%); }
  100% { transform: translateX(50%); }
}
.video-placeholder .play-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  opacity: 0.5;
}
.video-placeholder .placeholder-text {
  font-size: 0.85rem;
  opacity: 0.6;
}
.video-placeholder .placeholder-label {
  font-size: 0.75rem;
  opacity: 0.35;
  margin-top: 0.4rem;
}

/* ── BARRA DE PROGRESO ── */
.progress-section {
  padding: 0.8rem 1.2rem;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.progress-section .progress-label {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.progress-bar-bg {
  background: rgba(255,255,255,0.1);
  border-radius: 6px;
  height: 8px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, #2980b9, #27ae60);
  transition: width 0.5s ease;
}
.progress-stats {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.4);
  margin-top: 0.3rem;
}

/* ── RECURSOS ── */
.nota-recurso {
  background: #eaf2f8;
  border: 1px solid #aed6f1;
  border-left: 4px solid var(--color-accent);
  padding: 0.6rem 1rem;
  margin: 0.8rem 0;
  border-radius: 0 4px 4px 0;
  font-size: 0.88rem;
}
.nota-recurso a {
  color: var(--color-primary);
  font-weight: 600;
}

/* ── PDF VIEWER ── */
.pdf-viewer-wrap {
  margin: 1rem 0;
  border: 1px solid #d5e8f0;
  border-radius: 8px;
  overflow: hidden;
  background: #f8fbfd;
}
.pdf-viewer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.7rem 1rem;
  background: linear-gradient(135deg, #eaf2f8, #d4e6f1);
  cursor: pointer;
  user-select: none;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.pdf-viewer-header:hover {
  background: linear-gradient(135deg, #d4e6f1, #aed6f1);
}
.pdf-toggle {
  transition: transform 0.3s;
  font-size: 0.8rem;
  opacity: 0.6;
}
.pdf-viewer-wrap.collapsed .pdf-toggle {
  transform: rotate(-90deg);
}
.pdf-viewer {
  width: 100%;
  height: 70vh;
  border: none;
  display: block;
}
.pdf-viewer-wrap.collapsed .pdf-viewer,
.pdf-viewer-wrap.collapsed .pdf-download-link {
  display: none;
}
.pdf-download-link {
  display: block;
  text-align: center;
  padding: 0.5rem;
  font-size: 0.82rem;
  color: var(--color-primary);
  text-decoration: none;
  background: #eaf2f8;
  border-top: 1px solid #d5e8f0;
}
.pdf-download-link:hover {
  background: #d4e6f1;
}
.nota-vacio {
  color: var(--color-text-muted);
  font-style: italic;
  font-size: 0.88rem;
  margin: 0.5rem 0;
}
.contenido .tema-separador {
  margin: 2rem 0;
  border-top: 1px dashed #ddd;
}

/* ── PIE DE PÁGINA ── */
.footer {
  text-align: center;
  padding: 2rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  max-width: 820px;
  margin: 0 auto;
  border-top: 1px solid #e8e4df;
  background: var(--color-surface);
}

/* ── RESPONSIVE ── */
@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: 0.95rem; }
  .contenido { padding: 1.5rem 1rem; }
}