/* ================================================
   OMX Examen App - Estilos
   Basado en: OMX Design System GENERAL
   ================================================ */

/* ========================================
   1. VARIABLES Y RESET
   ======================================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* === COLORES DE FONDO === */
  --bg-main: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --bg-tertiary: #EEF2F7;
  --bg-dark: #0D1B2A;
  
  /* === AZUL ROYAL (Primario) === */
  --primary: #2B4BA0;
  --primary-light: #3D5FC4;
  --primary-dark: #1E3A5F;
  --primary-rgb: 43, 75, 160;
  
  /* === NARANJA OMX (Acento/CTA) === */
  --accent: #F5841F;
  --accent-light: #FFB347;
  --accent-dark: #D4691A;
  --accent-rgb: 245, 132, 31;
  
  /* === COLORES SECUNDARIOS === */
  --red-coral: #E63946;
  --cyan-tech: #4FC3F7;
  --yellow: #FFD93D;
  
  /* === TEXTO === */
  --text-main: #1E3A5F;
  --text-muted: #8B9DC3;
  --text-light: #FFFFFF;
  --text-body: #5B7FC3;
  
  /* === GRISES === */
  --gray-light: #C5C9D1;
  --gray-medium: #8B9DC3;
  
  /* === GLASSMORPHISM === */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-bg-strong: rgba(255, 255, 255, 0.92);
  --glass-border: rgba(43, 75, 160, 0.1);
  --glass-shadow: 0 8px 32px rgba(30, 58, 95, 0.1);
  
  /* === ESTADOS === */
  --success: #28A745;
  --success-light: #d4edda;
  --warning: #FFC107;
  --error: #DC3545;
  --error-light: #f8d7da;
  --info: #17A2B8;
  
  /* === TIPOGRAFÍA === */
  --font-display: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* === BORDES === */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 50px;
  
  /* === TRANSICIONES === */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* === SOMBRAS === */
  --shadow-sm: 0 2px 8px rgba(30, 58, 95, 0.06);
  --shadow-md: 0 4px 20px rgba(30, 58, 95, 0.1);
  --shadow-lg: 0 8px 30px rgba(30, 58, 95, 0.15);
  --shadow-accent: 0 4px 15px rgba(245, 132, 31, 0.3);
  
  /* === ESPACIADO === */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
}

/* ========================================
   2. BASE
   ======================================== */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-secondary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========================================
   3. FONDOS DECORATIVOS
   ======================================== */
.omx-bg-gradient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -3;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(var(--primary-rgb), 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(var(--accent-rgb), 0.06) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-main) 0%, var(--bg-secondary) 50%, var(--bg-main) 100%);
}

.omx-diagonal-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 40px,
    rgba(var(--primary-rgb), 0.02) 40px,
    rgba(var(--primary-rgb), 0.02) 42px
  );
  pointer-events: none;
  z-index: -2;
}

/* ========================================
   4. CONTENEDORES
   ======================================== */
.omx-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--space-xl);
}

.omx-container-sm {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space-xl);
}

.omx-view {
  min-height: 100vh;
  padding: var(--space-xl) 0;
  padding-bottom: 100px;
}

.omx-view.hidden {
  display: none;
}

/* ========================================
   5. TIPOGRAFÍA
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-main);
}

.omx-hero-title {
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.omx-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.omx-gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.omx-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary-dark);
}

.omx-brand-mx {
  color: var(--accent);
  font-weight: 800;
}

.omx-slogan {
  font-style: italic;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: block;
  margin-top: 2px;
}

.omx-text-center {
  text-align: center;
}

/* ========================================
   6. CARDS Y GLASS
   ======================================== */
.omx-glass-strong {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--glass-shadow);
}

.omx-card {
  background: var(--bg-main);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-lg);
}

.omx-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--bg-secondary);
}

.omx-card-accent {
  position: relative;
  overflow: hidden;
}

.omx-card-accent::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
}

/* ========================================
   7. HEADER Y LOGO
   ======================================== */
.omx-header-card {
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
  text-align: center;
}

.omx-logo-container {
  margin-bottom: var(--space-lg);
}

/* ========================================
   8. FORMULARIOS
   ======================================== */
.omx-form {
  background: var(--bg-main);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--glass-border);
}

.omx-form-header {
  margin-bottom: var(--space-xl);
}

.omx-form-title {
  font-size: 1.3rem;
  color: var(--primary-dark);
  margin-top: var(--space-sm);
}

.omx-form-group {
  margin-bottom: var(--space-lg);
}

.omx-label {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-main);
  margin-bottom: var(--space-sm);
}

.omx-label-hint {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.omx-input,
.omx-select {
  width: 100%;
  padding: 1rem 1.25rem;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-main);
  background: var(--bg-main);
  border: 2px solid var(--gray-light);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.omx-input:focus,
.omx-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.1);
}

.omx-input::placeholder {
  color: var(--text-muted);
}

.omx-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%232B4BA0' stroke-width='2'%3E%3Cpolyline points='6,9 12,15 18,9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

/* ========================================
   9. SELECTOR DE ESCUELA
   ======================================== */
.omx-escuela-selector {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.omx-escuela-card {
  cursor: pointer;
}

.omx-escuela-card input {
  display: none;
}

.omx-escuela-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border: 2px solid var(--gray-light);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  position: relative;
}

.omx-escuela-card:hover .omx-escuela-content {
  border-color: var(--primary);
  background: var(--bg-main);
}

.omx-escuela-card input:checked + .omx-escuela-content {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.05);
  box-shadow: var(--shadow-accent);
}

.omx-escuela-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.omx-escuela-info {
  text-align: center;
}

.omx-escuela-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary-dark);
}

.omx-escuela-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.omx-escuela-check {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 24px;
  height: 24px;
  background: var(--accent);
  border-radius: 50%;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  opacity: 0;
  transform: scale(0);
  transition: all var(--transition-fast);
}

.omx-escuela-card input:checked + .omx-escuela-content .omx-escuela-check {
  opacity: 1;
  transform: scale(1);
}

/* ========================================
   10. BADGES
   ======================================== */
.omx-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 1rem;
  background: rgba(var(--primary-rgb), 0.1);
  border: 1px solid rgba(var(--primary-rgb), 0.2);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
}

.omx-badge-solid {
  background: var(--primary);
  border: none;
  color: var(--text-light);
}

.omx-badge-accent {
  background: rgba(var(--accent-rgb), 0.1);
  border-color: rgba(var(--accent-rgb), 0.3);
  color: var(--accent-dark);
}

/* ========================================
   11. BOTONES
   ======================================== */
.omx-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
  outline: none;
}

.omx-btn-primary {
  background: var(--accent);
  color: var(--text-light);
  border-color: var(--accent);
  box-shadow: var(--shadow-accent);
}

.omx-btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
}

.omx-btn-secondary {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.omx-btn-secondary:hover {
  background: var(--primary);
  color: var(--text-light);
}

.omx-btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}

.omx-btn-outline:hover {
  background: var(--accent);
  color: var(--text-light);
}

.omx-btn-full {
  width: 100%;
}

.omx-btn-sm {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
}

.omx-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn-loading.hidden,
.btn-text.hidden {
  display: none;
}

/* ========================================
   12. ALERTAS
   ======================================== */
.omx-alert {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.omx-alert-error {
  background: var(--error-light);
  color: var(--error);
  border: 1px solid var(--error);
}

.omx-alert.hidden {
  display: none;
}

/* ========================================
   13. PROMO BANNER
   ======================================== */
.omx-promo-banner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.05), rgba(var(--accent-rgb), 0.05));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  margin-top: var(--space-xl);
}

.omx-promo-icon {
  font-size: 2rem;
}

.omx-promo-content {
  flex: 1;
}

.omx-promo-tag {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.omx-promo-content p {
  font-size: 0.9rem;
  color: var(--text-body);
  margin-top: 2px;
}

/* ========================================
   14. TIMER
   ======================================== */
.omx-timer {
  position: fixed;
  top: var(--space-md);
  right: var(--space-md);
  background: var(--glass-bg-strong);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 0.6rem 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
  box-shadow: var(--shadow-md);
  z-index: 1000;
}

.omx-timer.hidden {
  display: none;
}

.timer-icon {
  font-size: 1.2rem;
}

/* ========================================
   15. EXAMEN HEADER
   ======================================== */
.omx-examen-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 340px; /* Espacio para el navegador lateral */
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-xl);
  z-index: 100;
}

.omx-examen-info {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.omx-examen-info h2 {
  font-size: 1.1rem;
  margin: 0;
}

.omx-examen-progress {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.omx-examen-progress span {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.omx-progress {
  height: 8px;
  background: rgba(var(--primary-rgb), 0.1);
  border-radius: 4px;
  overflow: hidden;
  width: 120px;
}

.omx-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px;
  transition: width var(--transition-slow);
}

/* ========================================
   15.1 EXAMEN LAYOUT (NUEVO)
   ======================================== */
.omx-examen-layout {
  display: flex;
  padding-top: 80px; /* Espacio para header fijo */
  min-height: 100vh;
  justify-content: center; /* Centrar contenido */
}

.omx-examen-main {
  flex: 0 1 800px; /* Ancho máximo centrado */
  padding: var(--space-xl);
  margin-right: 320px; /* Espacio para sidebar */
  max-width: 100%;
  transition: margin-right var(--transition-normal);
}

.omx-examen-main.nav-collapsed {
  margin-right: 60px;
}

/* ========================================
   15.2 NAVEGADOR LATERAL
   ======================================== */
.omx-examen-nav {
  position: fixed;
  top: 80px;
  right: 0;
  width: 320px;
  height: calc(100vh - 80px);
  background: var(--glass-bg-strong);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  z-index: 99;
  transition: transform var(--transition-normal), width var(--transition-normal);
}

.omx-examen-nav.collapsed {
  width: 60px;
}

.omx-examen-nav.collapsed .omx-nav-content,
.omx-examen-nav.collapsed .omx-nav-footer,
.omx-examen-nav.collapsed .omx-nav-header h3 {
  display: none;
}

.omx-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
  background: var(--bg-main);
}

.omx-nav-header h3 {
  margin: 0;
  font-size: 1rem;
  color: var(--primary-dark);
}

.omx-nav-toggle {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  color: var(--primary);
  font-size: 12px;
}

.omx-nav-toggle:hover {
  background: var(--primary);
  color: white;
}

.omx-examen-nav.collapsed .omx-nav-toggle span {
  transform: rotate(180deg);
}

.omx-nav-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
}

/* Grupo de materia en el navegador */
.omx-nav-materia {
  margin-bottom: var(--space-md);
}

.omx-nav-materia-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-sm);
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--accent-rgb), 0.05));
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.omx-nav-materia-header:hover {
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15), rgba(var(--accent-rgb), 0.1));
}

.omx-nav-materia-icon {
  font-size: 1.1rem;
}

.omx-nav-materia-name {
  flex: 1;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.omx-nav-materia-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-main);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* Lista de preguntas en el navegador */
.omx-nav-preguntas {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-left: var(--space-sm);
}

.omx-nav-pregunta-btn {
  width: 36px;
  height: 36px;
  border: 2px solid var(--gray-light);
  background: var(--bg-main);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.omx-nav-pregunta-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: scale(1.05);
}

.omx-nav-pregunta-btn.answered {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

.omx-nav-pregunta-btn.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.3);
}

/* Footer del navegador */
.omx-nav-footer {
  display: flex;
  justify-content: space-around;
  padding: var(--space-md);
  border-top: 1px solid var(--glass-border);
  background: var(--bg-secondary);
}

.omx-nav-stats {
  text-align: center;
}

.stat-answered {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--success);
  display: block;
}

.stat-pending {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--accent);
  display: block;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Botón flotante para móvil */
.omx-nav-fab {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  z-index: 98;
  display: none;
  align-items: center;
  gap: var(--space-sm);
  transition: all var(--transition-normal);
}

.omx-nav-fab:hover {
  background: var(--primary-dark);
  transform: scale(1.05);
}

.omx-nav-fab.hidden {
  display: none;
}

/* ========================================
   16. PREGUNTAS Y MATERIAS
   ======================================== */
.omx-preguntas-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-width: 800px;
}

/* Sección de Materia */
.omx-materia-group {
  margin-bottom: var(--space-xl);
}

.omx-materia-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.1) 0%, rgba(var(--accent-rgb), 0.05) 100%);
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 100px;
}

.omx-materia-icon {
  width: 44px;
  height: 44px;
  background: var(--accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: white;
  flex-shrink: 0;
}

.omx-materia-info {
  flex: 1;
  min-width: 0; /* Evita desbordamiento */
}

.omx-materia-nombre {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--primary-dark);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 1px;
  word-wrap: break-word;
}

.omx-materia-count {
  font-size: 0.8rem;
  color: var(--accent-dark);
  margin-top: 2px;
  font-weight: 600;
}

.omx-materia-preguntas {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Pregunta individual */
.omx-pregunta {
  background: var(--bg-main);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  scroll-margin-top: 100px;
}

.omx-pregunta:hover {
  box-shadow: var(--shadow-md);
}

.omx-pregunta.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.2);
}

.omx-pregunta-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.omx-pregunta-numero {
  background: var(--primary);
  color: var(--text-light);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.omx-pregunta-texto {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.6;
}

.omx-pregunta-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-md) 0;
  border: 1px solid var(--glass-border);
}

.omx-imagen-container {
  margin: var(--space-md) 0;
}

.omx-imagen-error {
  padding: var(--space-lg);
  background: rgba(var(--accent-rgb), 0.1);
  border: 2px dashed var(--accent);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--accent-dark);
  font-weight: 600;
  font-size: 0.9rem;
}

.omx-img-error-small {
  color: var(--accent);
  font-size: 0.8rem;
  margin-left: 0.5rem;
}

.omx-opciones {
  display: flex !important;
  flex-direction: column !important;
  gap: var(--space-sm);
  width: 100%;
  clear: both;
}

.omx-opcion {
  cursor: pointer;
  display: block !important;
  width: 100%;
  clear: both;
  float: none !important;
}

.omx-opcion input {
  display: none;
}

.omx-opcion-content {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  width: 100%;
  box-sizing: border-box;
}

.omx-opcion:hover .omx-opcion-content {
  background: var(--bg-main);
  border-color: var(--gray-light);
}

.omx-opcion input:checked + .omx-opcion-content {
  background: rgba(var(--accent-rgb), 0.08);
  border-color: var(--accent);
}

.omx-opcion-letra {
  width: 28px;
  height: 28px;
  background: var(--gray-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-main);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.omx-opcion input:checked + .omx-opcion-content .omx-opcion-letra {
  background: var(--accent);
  color: var(--text-light);
}

.omx-opcion-texto {
  flex: 1;
  font-size: 0.95rem;
  color: var(--text-body);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* Asegurar que KaTeX no rompa el layout */
.omx-opcion-texto .katex-display {
  display: inline !important;
  margin: 0 !important;
}

.omx-opcion-texto .katex {
  font-size: 1em;
}

.omx-pregunta-texto .katex-display {
  display: block;
  margin: 0.5em 0;
}

.omx-opcion-img {
  max-width: 180px;
  height: auto;
  border-radius: var(--radius-sm);
  margin-top: var(--space-sm);
  display: block;
}

/* ========================================
   17. EXAMEN FOOTER
   ======================================== */
.omx-examen-footer {
  text-align: center;
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--glass-border);
  margin-top: var(--space-xl);
}

/* ========================================
   18. RESULTADOS
   ======================================== */
.omx-resultados-header {
  text-align: center;
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.omx-resultado-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.nivel-icon {
  font-size: 1.5rem;
}

.nivel-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.omx-resultados-header h1 {
  font-size: 1.8rem;
  margin-bottom: var(--space-lg);
}

.omx-resultado-score {
  margin-bottom: var(--space-md);
}

.score-big {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.score-label {
  font-size: 1rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.omx-resultado-percentil {
  font-size: 1.1rem;
  color: var(--text-body);
}

.omx-resultado-resumen {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

/* Canvas Gauss */
#gauss-canvas {
  width: 100%;
  max-width: 600px;
  height: 280px;
  margin: 0 auto;
  display: block;
}

/* ========================================
   19. LEADERBOARD
   ======================================== */
.omx-leaderboard {
  list-style: none;
  padding: 0;
  margin: 0;
}

.omx-leaderboard-item {
  display: flex;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateX(-30px);
}

.omx-leaderboard-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.omx-leaderboard-item.current-user {
  background: rgba(var(--accent-rgb), 0.1);
  border: 2px solid var(--accent);
}

.omx-leaderboard-item.top-3 {
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.08), rgba(var(--primary-rgb), 0.05));
}

.leaderboard-rank {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
  min-width: 35px;
}

.leaderboard-medal {
  font-size: 1.3rem;
  margin-right: var(--space-sm);
}

.leaderboard-name {
  flex: 1;
  font-weight: 600;
  color: var(--text-main);
}

.leaderboard-score {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--accent);
}

.omx-rank-summary {
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-top: var(--space-md);
  font-weight: 600;
  color: var(--primary);
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.omx-rank-summary.visible {
  opacity: 1;
}

/* ========================================
   20. TEMAS A REFORZAR
   ======================================== */
.omx-temas-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.omx-tema-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: rgba(var(--accent-rgb), 0.1);
  border: 1px solid rgba(var(--accent-rgb), 0.3);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-dark);
}

.omx-temas-success {
  padding: var(--space-lg);
  background: var(--success-light);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--success);
  font-weight: 600;
}

/* ========================================
   21. CTA CARD
   ======================================== */
.omx-cta-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.03), rgba(var(--accent-rgb), 0.05));
  border: 2px solid var(--accent);
}

.omx-cta-content {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.omx-cta-icon {
  font-size: 3rem;
}

.omx-cta-text h3 {
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
}

.omx-cta-text p {
  color: var(--text-body);
  margin: 0;
}

.omx-cta-buttons {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ========================================
   22. DESGLOSE DE RESPUESTAS
   ======================================== */
.omx-desglose-item {
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  border: 1px solid var(--glass-border);
}

.omx-desglose-item.correcta {
  background: var(--success-light);
  border-color: var(--success);
}

.omx-desglose-item.incorrecta {
  background: var(--error-light);
  border-color: var(--error);
}

.omx-desglose-pregunta {
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: var(--space-md);
}

.omx-desglose-respuestas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.omx-respuesta-badge {
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
}

.omx-respuesta-badge.correcta {
  background: var(--success);
  color: white;
}

.omx-respuesta-badge.incorrecta {
  background: var(--error);
  color: white;
}

.omx-desglose-justificacion {
  padding-top: var(--space-md);
  border-top: 1px dashed var(--gray-light);
  font-style: italic;
  color: var(--text-body);
  font-size: 0.9rem;
}

/* ========================================
   23. ACTION BUTTONS
   ======================================== */
.omx-action-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--glass-border);
}

/* ========================================
   24. LOADER
   ======================================== */
.omx-loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.omx-loader-overlay.hidden {
  display: none;
}

.omx-loader-content {
  text-align: center;
}

.omx-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(var(--primary-rgb), 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-md);
}

.omx-spinner-small {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.omx-loading-inline {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: var(--space-sm);
}

.omx-loading-inline.hidden {
  display: none;
}

.omx-loading-inline .omx-spinner-small {
  border-color: rgba(var(--primary-rgb), 0.2);
  border-top-color: var(--primary);
}

/* ========================================
   25. ANIMACIONES
   ======================================== */
.omx-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.omx-fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.omx-fade-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.omx-fade-in-delay-3 { animation-delay: 0.3s; opacity: 0; }

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hidden {
  display: none !important;
}

/* ========================================
   26. FOOTER
   ======================================== */
.omx-footer {
  padding: var(--space-2xl);
  text-align: center;
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
  margin-top: var(--space-2xl);
}

.omx-footer-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--primary-dark);
  margin-bottom: var(--space-xs);
}

.omx-footer-logo span {
  color: var(--accent);
}

.omx-footer-slogan {
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.omx-footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.omx-footer-credit {
  font-size: 0.7rem;
  color: var(--accent);
  margin-top: var(--space-md);
  letter-spacing: 1px;
}

/* ========================================
   27. RESPONSIVE
   ======================================== */
@media (max-width: 1024px) {
  .omx-examen-header {
    right: 300px;
  }
  
  .omx-examen-main {
    margin-right: 280px;
  }
  
  .omx-examen-nav {
    width: 280px;
  }
}

@media (max-width: 768px) {
  .omx-container,
  .omx-container-sm {
    padding: var(--space-md);
  }
  
  .omx-escuela-selector {
    grid-template-columns: 1fr;
  }
  
  .omx-examen-header {
    right: 0;
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
    padding: var(--space-sm) var(--space-md);
  }
  
  .omx-examen-info {
    flex-direction: column;
    gap: var(--space-xs);
  }
  
  .omx-examen-progress {
    justify-content: center;
  }
  
  .omx-progress {
    width: 120px;
  }
  
  /* Layout examen en móvil */
  .omx-examen-layout {
    display: block;
    justify-content: flex-start;
  }
  
  .omx-examen-main {
    padding: var(--space-md);
    padding-top: 120px;
    margin-right: 0;
    padding-bottom: 100px;
  }
  
  .omx-examen-main.nav-collapsed {
    margin-right: 0;
  }
  
  /* Navegador lateral en móvil - oculto por defecto */
  .omx-examen-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 320px;
    height: 100vh;
    z-index: 1000;
    transition: right var(--transition-normal);
    box-shadow: -5px 0 30px rgba(0,0,0,0.2);
  }
  
  .omx-examen-nav.mobile-hidden {
    right: -100%;
  }
  
  .omx-examen-nav.mobile-visible {
    right: 0;
  }
  
  /* FAB para abrir navegador */
  .omx-nav-fab {
    display: flex !important;
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    align-items: center;
    gap: var(--space-sm);
  }
  
  .omx-nav-fab:active {
    transform: scale(0.95);
  }
  
  /* Overlay para cerrar */
  .omx-examen-nav.mobile-visible::before {
    content: '';
    position: fixed;
    top: 0;
    left: -100vw;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: -1;
  }
  
  /* Header de materia más compacto */
  .omx-materia-header {
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
  }
  
  .omx-materia-icon {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
  }
  
  .omx-materia-nombre {
    font-size: 0.85rem;
  }
  
  .omx-materia-count {
    font-size: 0.75rem;
  }
  
  /* Timer en móvil */
  .omx-timer {
    top: auto;
    bottom: 80px;
    right: var(--space-md);
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
  
  .omx-cta-content {
    flex-direction: column;
    text-align: center;
  }
  
  .omx-cta-buttons {
    justify-content: center;
  }
  
  .omx-promo-banner {
    flex-direction: column;
    text-align: center;
  }
  
  .omx-btn-full-mobile {
    width: 100%;
  }
  
  .score-big {
    font-size: 3rem;
  }
}

@media (max-width: 480px) {
  .omx-hero-title {
    font-size: 1.5rem;
  }
  
  .omx-form {
    padding: var(--space-lg);
  }
  
  .omx-pregunta {
    padding: var(--space-lg);
  }
  
  .omx-action-buttons {
    flex-direction: column;
  }
  
  .omx-action-buttons .omx-btn {
    width: 100%;
  }
  
  .omx-examen-main {
    padding-top: 140px;
  }
  
  .omx-materia-header {
    flex-direction: row;
    text-align: left;
  }
  
  .omx-nav-preguntas {
    justify-content: center;
  }
}