/* ===================================
   VARIABLES CSS Y SISTEMA DE COLORES
   =================================== */

:root {
  /* Colores primarios (azul institucional) */
  --primary-100: #E6F0FF;
  --primary-500: #0057B7;
  --primary-700: #003D82;
  
  /* Colores de acento (verde tecnológico) */
  --accent-green-500: #059669;
  --accent-green-700: #047857;
  
  /* Color de acento secundario (naranja) */
  --accent-orange-500: #F97316;
  
  /* Colores neutros */
  --bg-page: #F8F9FA;
  --bg-surface: #FFFFFF;
  --text-primary: #111827;
  --text-secondary: #6B7280;
  --border-subtle: #E5E7EB;
  
  /* Tipografía */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Espaciado (sistema de 8px) */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-xxl: 96px;
  
  /* Radios y sombras */
  --radius-sm: 8px;
  --radius-md: 16px;
  --shadow-card: 0 8px 24px rgba(0, 87, 183, 0.08);
  --shadow-hover: 0 12px 32px rgba(0, 87, 183, 0.12);
  
  /* Transiciones */
  --transition-fast: 0.2s ease-out;
  --transition-normal: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* ===================================
   RESET Y BASE
   =================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ===================================
   UTILIDADES
   =================================== */

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

.section {
  padding: var(--space-xxl) 0;
}

.section-alt {
  background-color: var(--bg-surface);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.section-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================================
   NAVEGACIÓN
   =================================== */

.navbar {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-500);
}

.nav-icon {
  width: 32px;
  height: 32px;
  color: var(--primary-500);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-500);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-500);
  transition: width var(--transition-normal);
}

.nav-link:hover::after {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: var(--space-xs);
  cursor: pointer;
  color: var(--text-primary);
}

/* ===================================
   BOTONES
   =================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 12px var(--space-md);
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-green-500);
  color: white;
  box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
}

.btn-primary:hover {
  background-color: var(--accent-green-700);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(5, 150, 105, 0.35);
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary-500);
  border: 1px solid var(--primary-500);
}

.btn-secondary:hover {
  background-color: var(--primary-100);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  background-color: var(--bg-page);
  border-color: var(--primary-500);
  color: var(--primary-500);
}

.btn-large {
  padding: 16px var(--space-lg);
  font-size: 18px;
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
  padding: 120px 0 var(--space-xxl);
  background: linear-gradient(135deg, var(--bg-page) 0%, var(--primary-100) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(ellipse at center, rgba(0, 87, 183, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background-color: var(--bg-surface);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-500);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-card);
}

.badge-icon {
  width: 16px;
  height: 16px;
}

.hero-title {
  font-size: 60px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-features {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-secondary);
  font-weight: 500;
}

.feature-icon {
  width: 20px;
  height: 20px;
  color: var(--primary-500);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

/* ===================================
   ABOUT SECTION
   =================================== */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about-content h3 {
  font-size: 30px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.about-content p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.about-benefits {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.benefit-item {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
}

.benefit-icon {
  width: 24px;
  height: 24px;
  color: var(--accent-green-500);
  flex-shrink: 0;
  margin-top: 2px;
}

.benefit-item h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.benefit-item p {
  font-size: 16px;
  color: var(--text-secondary);
  margin: 0;
}

.about-visual {
  display: flex;
  justify-content: center;
}

.visual-card {
  background-color: var(--bg-surface);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  width: 100%;
  max-width: 400px;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.stat-item {
  text-align: center;
  padding: var(--space-sm);
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary-500);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===================================
   LEVELS SECTION
   =================================== */

.levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-xl);
}

.level-card {
  background-color: var(--bg-surface);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.level-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-green-500));
}

.level-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.level-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.level-badge {
  background-color: var(--primary-100);
  color: var(--primary-500);
  padding: 4px var(--space-sm);
  border-radius: 50px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.duration-badge {
  background-color: var(--accent-orange-500);
  color: white;
  padding: 4px var(--space-sm);
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
}

.level-title {
  font-size: 30px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.level-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.level-modules h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.level-modules ul {
  list-style: none;
  margin-bottom: var(--space-md);
}

.level-modules li {
  color: var(--text-secondary);
  margin-bottom: 8px;
  padding-left: var(--space-sm);
  position: relative;
}

.level-modules li::before {
  content: '•';
  color: var(--primary-500);
  position: absolute;
  left: 0;
}

.level-result {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background-color: var(--bg-page);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  font-size: 14px;
}

.result-icon {
  width: 16px;
  height: 16px;
  color: var(--accent-green-500);
}

.level-btn {
  width: 100%;
  justify-content: center;
}

/* ===================================
   MODULES SECTION
   =================================== */

.modules-filters {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: 50px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn.active,
.filter-btn:hover {
  background-color: var(--primary-500);
  color: white;
  border-color: var(--primary-500);
}

.modules-accordion {
  max-width: 900px;
  margin: 0 auto;
}

.module-item {
  background-color: var(--bg-surface);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.module-header {
  padding: var(--space-md);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.module-header:hover {
  background-color: var(--bg-page);
}

.module-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.module-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 14px;
  color: var(--text-secondary);
}

.module-duration {
  background-color: var(--primary-100);
  color: var(--primary-500);
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.chevron {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  transition: transform var(--transition-normal);
}

.module-item.active .chevron {
  transform: rotate(180deg);
}

.module-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-in-out;
}

.module-content.active {
  max-height: 1000px;
}

.module-details {
  padding: 0 var(--space-md) var(--space-md);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.detail-group h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.detail-group p,
.detail-group ul {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.detail-group ul {
  list-style: none;
}

.detail-group li {
  padding-left: var(--space-sm);
  position: relative;
  margin-bottom: 4px;
}

.detail-group li::before {
  content: '✓';
  color: var(--accent-green-500);
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* ===================================
   CTA SECTION
   =================================== */

.cta-section {
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
  color: white;
  padding: var(--space-xxl) 0;
}

.cta-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.cta-title {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.cta-subtitle {
  font-size: 20px;
  opacity: 0.9;
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.cta-features {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.cta-feature {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 16px;
  opacity: 0.9;
}

.cta-icon {
  width: 20px;
  height: 20px;
}

/* ===================================
   FOOTER
   =================================== */

.footer {
  background-color: var(--text-primary);
  color: white;
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 24px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.footer-icon {
  width: 32px;
  height: 32px;
  color: var(--primary-100);
}

.footer-description {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.footer-column h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--primary-100);
}

.footer-column a {
  display: block;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  margin-bottom: var(--space-xs);
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--primary-100);
}

.contact-icon {
  width: 16px;
  height: 16px;
  margin-right: var(--space-xs);
}

.social-links {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: background-color var(--transition-fast);
}

.social-link:hover {
  background-color: var(--primary-500);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

/* ===================================
   ANIMACIONES
   =================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .module-details {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-sm);
  }
  
  .section-title {
    font-size: 36px;
  }
  
  .hero-title {
    font-size: 40px;
  }
  
  .hero-subtitle {
    font-size: 18px;
  }
  
  .hero-features {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .nav-links {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .levels-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-title {
    font-size: 32px;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .cta-features {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 100px 0 var(--space-xl);
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .section {
    padding: var(--space-xl) 0;
  }
  
  .section-title {
    font-size: 28px;
  }
}