/* ==========================================================================
   ESTILOS GENERALES Y VARIABLES - BLENDER MASTER PARA EXPERTOS DE 3DS MAX
   Portal Educativo UVI · Universidad Virtual Inteligente
   ========================================================================== */

:root {
  --bg-primary: #0e1211;
  --bg-secondary: #151a17;
  --bg-surface: #1b221e;
  --bg-card: #202924;
  --bg-card-hover: #26322b;
  --bg-highlight: #28372d;
  
  --border-subtle: #ffffff14;
  --border-medium: #ffffff24;
  --border-focus: #d7f969;
  
  --text-primary: #f3f5ee;
  --text-secondary: #a9b5a4;
  --text-muted: #798675;
  
  /* Acentos de identidad UVI & Blender */
  --uvi-lime: #d7f969;
  --uvi-lime-glow: rgba(215, 249, 105, 0.25);
  --uvi-dark-lime: #2b3917;
  --blender-orange: #ea7600;
  --blender-orange-glow: rgba(234, 118, 0, 0.3);
  --blender-blue: #2680eb;
  --max-cyan: #00bcd4;
  --spacemouse-accent: #00e5ff;
  
  --success: #4caf50;
  --error: #f44336;
  --warning: #ff9800;
  --info: #29b6f6;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  --font-mono: 'Consolas', 'Cascadia Code', 'Fira Code', monospace;
}

[data-theme="light"] {
  --bg-primary: #f6f8f5;
  --bg-secondary: #edf1ec;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f3f7f0;
  --bg-highlight: #e8f4d9;
  
  --border-subtle: #00000018;
  --border-medium: #00000030;
  --border-focus: #4b7800;
  
  --text-primary: #172115;
  --text-secondary: #4d5c48;
  --text-muted: #788773;
  
  --uvi-lime: #528c00;
  --uvi-lime-glow: rgba(82, 140, 0, 0.2);
  --uvi-dark-lime: #e2f2cb;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 2px solid var(--bg-secondary);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--uvi-lime);
}

::selection {
  background: var(--uvi-lime);
  color: #10150d;
}

/* ==========================================================================
   HEADER SUPERIOR DE NAVEGACIÓN
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(14, 18, 17, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
}

[data-theme="light"] .site-header {
  background: rgba(246, 248, 245, 0.92);
}

.header-inner {
  max-width: 1560px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
  color: inherit;
}

.uvi-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -1.5px;
}

.uvi-badge .dot {
  color: var(--uvi-lime);
}

.brand-separator {
  color: var(--text-muted);
  font-weight: 300;
}

.blender-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.5px;
  color: var(--blender-orange);
}

.blender-badge svg {
  width: 26px;
  height: 22px;
}

.header-search {
  flex: 1;
  max-width: 440px;
  position: relative;
}

.header-search input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 14px;
  transition: all var(--transition-fast);
}

.header-search input:focus {
  outline: none;
  border-color: var(--uvi-lime);
  box-shadow: 0 0 0 3px var(--uvi-lime-glow);
}

.header-search svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
}

.btn-header:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  background: var(--bg-card);
}

.btn-header.primary {
  background: var(--uvi-lime);
  color: #121909;
  border-color: transparent;
}

.btn-header.primary:hover {
  background: #e7ff9b;
  transform: translateY(-1px);
}

/* ==========================================================================
   HERO / BANNER DE APERTURA
   ========================================================================== */
.hero-section {
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 80% 20%, rgba(234, 118, 0, 0.12), transparent 45%),
              radial-gradient(circle at 20% 80%, rgba(215, 249, 105, 0.08), transparent 40%),
              var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  padding: 56px 28px 48px;
}

.hero-container {
  max-width: 1560px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.tag-badge {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 5px 12px;
  border-radius: 20px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.tag-badge.max {
  background: rgba(0, 188, 212, 0.15);
  color: #38d3e8;
  border: 1px solid rgba(0, 188, 212, 0.3);
}

.tag-badge.blender {
  background: var(--blender-orange-glow);
  color: #ff9d3b;
  border: 1px solid rgba(234, 118, 0, 0.4);
}

.tag-badge.spacemouse {
  background: rgba(0, 229, 255, 0.12);
  color: #00e5ff;
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.tag-badge.uvi {
  background: rgba(215, 249, 105, 0.15);
  color: var(--uvi-lime);
  border: 1px solid rgba(215, 249, 105, 0.35);
}

.hero-title {
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -2px;
  margin-bottom: 18px;
}

.hero-title .highlight {
  color: var(--blender-orange);
}

.hero-title .lime {
  color: var(--uvi-lime);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 30px;
  max-width: 780px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.metric-item strong {
  display: block;
  font-size: 26px;
  font-weight: 800;
  color: var(--uvi-lime);
  font-family: var(--font-mono);
}

.metric-item span {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

/* Tarjeta interactiva de Hardware 3Dconnexion en el Hero */
.hardware-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  position: relative;
  overflow: hidden;
}

.hardware-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--spacemouse-accent), var(--blender-orange), var(--uvi-lime));
}

.hardware-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.hardware-card-header h3 {
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hardware-status {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--spacemouse-accent);
  background: rgba(0, 229, 255, 0.1);
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid rgba(0, 229, 255, 0.25);
}

.hardware-visual {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  margin-bottom: 20px;
}

.degrees-freedom-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 15px;
}

.dof-pill {
  background: var(--bg-surface);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.dof-pill.active, .dof-pill:hover {
  color: var(--spacemouse-accent);
  border-color: var(--spacemouse-accent);
  background: rgba(0, 229, 255, 0.08);
}

.hardware-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.hardware-checklist li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hardware-checklist svg {
  color: var(--uvi-lime);
  flex-shrink: 0;
}

/* ==========================================================================
   BARRA DE EVOLUCIÓN DEL ESTUDIANTE (GAMIFICACIÓN Y PROGRESO)
   ========================================================================== */
.evolution-bar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 28px;
}

.evolution-inner {
  max-width: 1560px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.evolution-rank {
  display: flex;
  align-items: center;
  gap: 14px;
}

.rank-badge-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--uvi-dark-lime);
  border: 2px solid var(--uvi-lime);
  display: grid;
  place-items: center;
  color: var(--uvi-lime);
  font-weight: 800;
  font-size: 18px;
}

.rank-info strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.rank-info span {
  font-size: 12px;
  color: var(--text-muted);
}

.evolution-progress-box {
  flex: 1;
  max-width: 600px;
}

.evolution-progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-family: var(--font-mono);
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.progress-track {
  width: 100%;
  height: 8px;
  background: var(--bg-card);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blender-orange), var(--uvi-lime));
  width: 0%;
  transition: width 0.4s ease;
}

.btn-reset-progress {
  background: transparent;
  border: 0;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  text-decoration: underline;
  padding: 4px;
}
.btn-reset-progress:hover {
  color: var(--error);
}

/* ==========================================================================
   LAYOUT PRINCIPAL: SIDEBAR STICKY + CONTENIDO CENTRAL
   ========================================================================== */
.main-wrapper {
  max-width: 1560px;
  margin: 0 auto;
  padding: 36px 28px;
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.sidebar-nav {
  position: sticky;
  top: 86px;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 16px;
}

.sidebar-title {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  padding: 0 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.phase-group {
  margin-bottom: 20px;
}

.phase-header {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--uvi-lime);
  padding: 6px 10px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.phase-header.blender-accent {
  color: var(--blender-orange);
}

.level-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  text-decoration: none;
  margin-bottom: 3px;
  transition: all var(--transition-fast);
  border-left: 2px solid transparent;
}

.level-link:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.level-link.active {
  background: var(--bg-card);
  color: var(--uvi-lime);
  border-left-color: var(--uvi-lime);
  font-weight: 600;
}

.level-check {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid var(--border-medium);
  display: grid;
  place-items: center;
  font-size: 10px;
  color: transparent;
  transition: all var(--transition-fast);
}

.level-link.completed .level-check {
  background: var(--uvi-lime);
  border-color: var(--uvi-lime);
  color: #121909;
}

/* ==========================================================================
   BUSCADOR DE EQUIVALENCIAS Y HERRAMIENTAS RÁPIDAS
   ========================================================================== */
.quick-tools-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 36px;
}

.quick-tools-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.quick-tools-header h3 {
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}

.dictionary-search-box {
  position: relative;
  margin-bottom: 16px;
}

.dictionary-search-box input {
  width: 100%;
  padding: 12px 18px 12px 46px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 15px;
}

.dictionary-search-box input:focus {
  outline: none;
  border-color: var(--uvi-lime);
}

.dictionary-search-box svg {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.dictionary-results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
  max-height: 280px;
  overflow-y: auto;
  padding: 4px;
}

.dict-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
}

.dict-terms {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
}

.dict-max {
  color: #38d3e8;
  display: flex;
  align-items: center;
  gap: 6px;
}

.dict-arrow {
  color: var(--text-muted);
}

.dict-blender {
  color: var(--blender-orange);
  display: flex;
  align-items: center;
  gap: 6px;
}

.dict-shortcut {
  font-family: var(--font-mono);
  background: var(--bg-card);
  padding: 3px 8px;
  border-radius: 4px;
  color: var(--uvi-lime);
  align-self: flex-start;
  font-size: 11px;
}

.dict-notes {
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.4;
}

/* ==========================================================================
   ESTRUCTURA DE CADA NIVEL DE CONTENIDO
   ========================================================================== */
.phase-section {
  margin-bottom: 56px;
}

.phase-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 5px solid var(--uvi-lime);
  border-radius: var(--radius-md);
  padding: 24px 30px;
  margin-bottom: 36px;
}

.phase-banner.orange {
  border-left-color: var(--blender-orange);
}

.phase-banner .eyebrow {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.phase-banner h2 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.phase-banner p {
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 900px;
}

.level-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: 40px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.level-card:hover {
  border-color: var(--border-medium);
}

.level-header {
  padding: 24px 30px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-secondary);
}

.level-badge-title {
  display: flex;
  align-items: center;
  gap: 16px;
}

.level-number {
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--bg-primary);
  background: var(--uvi-lime);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.level-header h3 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin: 0;
}

.level-body {
  padding: 32px 30px;
}

.level-body h4 {
  font-size: 18px;
  font-weight: 700;
  margin: 24px 0 12px;
  color: var(--uvi-lime);
  display: flex;
  align-items: center;
  gap: 8px;
}

.level-body p {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 18px;
  line-height: 1.7;
}

.level-body ul, .level-body ol {
  margin: 0 0 20px 24px;
  color: var(--text-secondary);
  font-size: 15px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.level-body li strong {
  color: var(--text-primary);
}

/* Callouts / Avisos especiales */
.callout {
  padding: 18px 22px;
  border-radius: var(--radius-md);
  margin: 22px 0;
  font-size: 14px;
  line-height: 1.6;
  border-left: 4px solid;
}

.callout-max {
  background: rgba(0, 188, 212, 0.08);
  border-left-color: #00bcd4;
  color: #b2ebf2;
}

.callout-max strong {
  color: #38d3e8;
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.callout-spacemouse {
  background: rgba(0, 229, 255, 0.08);
  border-left-color: var(--spacemouse-accent);
  color: #e0f7fa;
}

.callout-spacemouse strong {
  color: var(--spacemouse-accent);
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.callout-tip {
  background: rgba(215, 249, 105, 0.08);
  border-left-color: var(--uvi-lime);
  color: #eaf8d2;
}

.callout-tip strong {
  color: var(--uvi-lime);
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.callout-warn {
  background: rgba(255, 152, 0, 0.08);
  border-left-color: var(--warning);
  color: #ffe0b2;
}

.callout-warn strong {
  color: var(--warning);
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

/* Tablas comparativas Max vs Blender */
.table-responsive {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.compare-table th {
  background: var(--bg-card);
  padding: 14px 18px;
  color: var(--text-primary);
  font-weight: 700;
  border-bottom: 1px solid var(--border-medium);
}

.compare-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.compare-table tr:hover td {
  background: var(--bg-card-hover);
}

.compare-table .tag-max {
  color: #38d3e8;
  font-weight: 600;
}

.compare-table .tag-blender {
  color: var(--blender-orange);
  font-weight: 600;
}

kbd {
  font-family: var(--font-mono);
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  padding: 2px 7px;
  font-size: 12px;
  color: var(--uvi-lime);
  box-shadow: 0 1px 0 rgba(0,0,0,0.4);
}

/* ==========================================================================
   SISTEMA DE QUIZZES Y EVALUACIÓN INTERACTIVA
   ========================================================================== */
.quiz-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 30px;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.quiz-header h5 {
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.quiz-question {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.quiz-option-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.quiz-option-btn:hover {
  background: var(--bg-card);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

.quiz-option-btn.selected-correct {
  background: rgba(76, 175, 80, 0.15);
  border-color: var(--success);
  color: #a5d6a7;
}

.quiz-option-btn.selected-wrong {
  background: rgba(244, 67, 54, 0.15);
  border-color: var(--error);
  color: #ef9a9a;
}

.quiz-feedback {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  line-height: 1.5;
  margin-bottom: 16px;
  display: none;
}

.quiz-feedback.show-correct {
  display: block;
  background: rgba(76, 175, 80, 0.12);
  border: 1px solid var(--success);
  color: #c8e6c9;
}

.quiz-feedback.show-wrong {
  display: block;
  background: rgba(244, 67, 54, 0.12);
  border: 1px solid var(--error);
  color: #ffcdd2;
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.btn-complete-level {
  background: var(--uvi-lime);
  color: #121909;
  border: 0;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn-complete-level:hover {
  background: #e7ff9b;
  transform: translateY(-1px);
}

.btn-complete-level.done {
  background: var(--bg-card);
  color: var(--uvi-lime);
  border: 1px solid var(--uvi-lime);
}

/* ==========================================================================
   FOOTER DEL INSTRUCTIVO EDUCATIVO
   ========================================================================== */
.doc-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 28px;
  margin-top: 80px;
}

.doc-footer-inner {
  max-width: 1560px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.doc-footer-brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.doc-footer-brand strong {
  font-size: 16px;
  color: var(--text-primary);
}

.doc-footer-brand span {
  font-size: 13px;
  color: var(--text-muted);
}

.doc-footer-links {
  display: flex;
  gap: 20px;
  font-size: 14px;
}

.doc-footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.doc-footer-links a:hover {
  color: var(--uvi-lime);
}

/* ==========================================================================
   RESPONSIVIDAD Y MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1100px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .main-wrapper {
    grid-template-columns: 1fr;
  }
  .sidebar-nav {
    position: relative;
    top: 0;
    max-height: none;
    margin-bottom: 30px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: stretch;
  }
  .header-search {
    max-width: none;
  }
  .evolution-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  .level-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .level-body {
    padding: 22px 18px;
  }
}