/* Reset y Variables CSS */
:root {
  /* Colores modo claro */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-muted: #f1f3f4;
  --text-primary: #1a1a1a;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --accent: #003366;
  --accent-hover: #002244;
  --accent-light: #4d8bcc;
  
  /* Espaciado */
  --container-max-width: 1200px;
  --section-padding: 4rem 0;
  --border-radius: 0.5rem;
  
  /* Transiciones */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

[data-theme="dark"] {
  /* Colores modo oscuro */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-muted: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border: #334155;
  --accent: #4d8bcc;
  --accent-hover: #3b82f6;
  --accent-light: #60a5fa;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: var(--transition);
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

[data-theme="dark"] .header {
  background: rgba(15, 23, 42, 0.95);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav-brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand-link {
  width: 100px;
}

.brand-link-footer {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  padding: 0.5rem 0;
  transition: var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

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

.theme-toggle {
  background: none;
  border: none;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--bg-muted);
  color: var(--text-primary);
}

.theme-icon {
  position: absolute;
  width: 1.25rem;
  height: 1.25rem;
  transition: var(--transition);
}

.sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.moon-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0);
}

[data-theme="dark"] .sun-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0);
}

[data-theme="dark"] .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
}

.menu-icon,
.close-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: var(--transition);
}

.close-icon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg);
}

.mobile-menu-btn.active .menu-icon {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(-90deg);
}

.mobile-menu-btn.active .close-icon {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg);
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateY(-10px);
  transition: var(--transition);
}

.mobile-nav.active {
  opacity: 1;
  transform: translateY(0);
}

.mobile-nav-content {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav-link {
  text-align: left;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.mobile-nav-link:last-of-type {
  border-bottom: none;
}

.mobile-theme-toggle {
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-fast);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

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

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

.btn-outline:hover {
  background: var(--bg-muted);
  border-color: var(--accent);
}

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

/* Secciones */
section {
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto;
}

.section-footer {
  text-align: center;
  margin-top: 3rem;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #003366 0%, #001a33 100%);
  color: white;
  padding: 8rem 0 4rem;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

[data-theme="dark"] .hero {
  background: linear-gradient(135deg, #001a33 0%, #000d1a 100%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero .btn-primary {
  background: white;
  color: var(--accent);
}

.hero .btn-primary:hover {
  background: #f8f9fa;
}

.hero .btn-outline {
  border-color: rgba(255, 255, 255, 0.3);
  color: white;
}

.hero .btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
}

.hero-image {
  display: flex;
  justify-content: center;
  height: 450px;
  opacity: 0.9;
}

.hero-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--border-radius);
}

/* About */
.about {
  background: var(--bg-primary);
}

.about-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

.about-item {
  margin-bottom: 1rem;
  margin-top: 1rem;
}

.about-item h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.about-item p {
  color: var(--text-secondary);
}

/* Full Day */
.fullday {
  background: var(--bg-secondary);
}

.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.event-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.event-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.event-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.event-content {
  height: 480px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.5rem;
}

.event-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.event-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.event-meta i {
  width: 1rem;
  height: 1rem;
}

.event-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.countdown-container {
  background: var(--bg-muted);
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
}

.countdown-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.countdown-timer {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  text-align: center;
}

.countdown-item {
  display: flex;
  flex-direction: column;
}

.countdown-number {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.countdown-unit {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.countdown-expired {
  text-align: center;
  padding: 0.5rem;
  background: #fee2e2;
  color: #dc2626;
  border-radius: var(--border-radius);
  /*Corregir*/
  width: 289px;
}

[data-theme="dark"] .countdown-expired {
  background: #7f1d1d;
  color: #fca5a5;
}

/* Investigación */
.research {
  background: var(--bg-primary);
}

.tabs {
  max-width: 1000px;
  margin: 0 auto;
}

.tabs-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--bg-muted);
  border-radius: var(--border-radius);
  padding: 0.25rem;
  margin-bottom: 2rem;
}

.tab-trigger {
  background: none;
  border: none;
  padding: 0.75rem 1rem;
  border-radius: calc(var(--border-radius) - 0.25rem);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-trigger.active {
  background: var(--bg-primary);
  color: var(--text-primary);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.tabs-content {
  position: relative;
}

.tab-content {
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 2rem;
}

.tab-content.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.tab-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.tab-text h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.tab-text p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.feature-list i {
  color: var(--accent);
  width: 1rem;
  height: 1rem;
}

.tab-image img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

/* Team */
.team {
  background: var(--bg-secondary);
}

.team-grid {
  display: grid;
  gap: 2rem;
  justify-items: center;
  grid-template-columns: 1fr;
}

.team-member {
  text-align: center;
  opacity: 1;
  transform: translateY(0);
  transition: var(--transition);
  max-width: 300px;
  width: 100%;
}

.team-member.first-member {
  grid-column: 1 / -1;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .team-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .team-member.first-member {
    grid-column: 1 / -1;
  }
  
  .team-member:not(.first-member) {
    max-width: 250px;
  }
}

.team-member.hidden {
  opacity: 0;
  transform: translateY(20px);
}

.team-member.show {
  opacity: 1;
  transform: translateY(0);
}

.team-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1rem;
  display: block;
}

.team-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.team-role {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.team-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Contact */
.contact {
  background: var(--bg-primary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info h3,
.contact-form h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.contact-info p,
.contact-form p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
}

.contact-item i {
  color: var(--accent);
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.125rem;
  flex-shrink: 0;
}

.contact-item h4 {
  font-weight: 500;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 0;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

.social-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: var(--transition-fast);
}

.social-links a:hover {
  color: var(--accent);
}

/* Form */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(77, 139, 204, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

/* Footer */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 2rem 0 1rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links p {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.75rem;
  transition: var(--transition-fast);
}

.footer-links p:hover {
  color: var(--text-primary);
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  
  .mobile-menu-btn,
  .mobile-nav {
    display: block;
  }
  
  .hero {
    padding: 6rem 0 3rem;
    text-align: center;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .about-content,
  .contact-content,
  .tab-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .tabs-list {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }
  
  .footer-brand {
    align-items: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.75rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .events-grid,
  .team-grid {
    grid-template-columns: 1fr;
  }
}

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

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* Utilidades */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}