/* ==========================================================================
   1. BASE STYLES
   Configuración global del documento
   ========================================================================== */
body {
  background-color: var(--bg-page);
  color: var(--text-dark);
    font-size: 1.2rem; 
}

/* ==========================================================================
   2. CSS VARIABLES
   Paleta de colores y configuraciones globales (NO MODIFICADAS)
   ========================================================================== */
:root {
  /* Paleta Corporativa */
  --corp-blue-dark: #0A192F;
  --corp-blue-main: #112240;
  --corp-champagne: #C5A880;
  --corp-silver: #8892B0;
  --corp-blue-ice: #CCD6F6;
  --corp-blue-accent: #3b82f6;
  --corp-white: #FFFFFF;

  /* Textos y Acentos */
  --text-dark: #1e293b;
  --text-muted: #64748b;
  --text-champagne: #C5A880; 
  --accent: #b9a21b;
  --bg-page: #F8FAFC;

  /* UI Elements */
  --border-color-glass: rgba(59, 130, 246, 0.2);
  --transition-smooth: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.bg-corp-dark { background-color: var(--corp-blue-dark); }
.bg-corp-main { background-color: var(--corp-blue-main); }
.bg-corp-accent { background-color: var(--corp-blue-accent); }

.text-accent { color: var(--accent) !important; }
.text-corp-blue { color: var(--corp-blue-accent) !important; }
.text-corp-white {color: var(--corp-white) ! important; }

/* ==========================================================================
   3. BUTTONS
   Estilos para botones principales y llamadas a la acción
   ========================================================================== */

/* Botón vibrante con resplandor (Ej: Glass Card / Call for papers) */
.btn-accent-glow {
  background-color: var(--corp-blue-accent);
  color: var(--corp-white);
  font-weight: 600;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  border: none;
  transition: var(--transition-smooth);
  text-align: center;
  display: inline-block;
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4); /* Sombra azul brillante */
}

.btn-accent-glow:hover {
  background-color: #2563eb;
  color: var(--corp-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
}

/* Botón azul sólido (Ej: Tarjeta de cronograma) */
.btn-primary-custom {
  background-color: var(--corp-blue-main);
  color: var(--corp-white);
  font-weight: 600;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  border: none;
  transition: var(--transition-smooth);
  text-align: center;
  display: inline-block;
  text-decoration: none;
}

.btn-primary-custom:hover {
  background-color: var(--corp-blue-dark);
  color: var(--corp-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(10, 25, 47, 0.15);
}

.btn-primary-custom.active {
    background-color: var(--corp-blue-accent);
    color: white;          
}

/* ==========================================================================
   4. CARDS
   Tarjetas con efecto Glassmorphism (Vidrio esmerilado)
   ========================================================================== */
.elegant-card {
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border-radius: 16px;
  border: 1px solid var(--border-color-glass);
  box-shadow: 0 10px 15px -3px rgba(10, 25, 47, 0.05), 0 4px 6px -2px rgba(10, 25, 47, 0.03);
  transition: var(--transition-smooth);
  overflow: hidden;
  
  /* Optimizaciones de rendimiento para animaciones fluidas */
  will-change: transform, backdrop-filter;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  transform: translateZ(0);
}

.elegant-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 25px 50px -12px rgba(10, 25, 47, 0.15);
  border-color: rgba(59, 130, 246, 0.5);
}

/* Contraste de texto dentro de las tarjetas de vidrio */
.elegant-card .card-body p,
.elegant-card .table {
  /* color: var(--text-dark); */
  /* opacity: 0.85; */
}


/* ==========================================================================
   6. FOOTER
   Estructura y estilos del pie de página (Sponsors, Main, Bottom)
   ========================================================================== */

/* --- 6.1 Franja Clara de Sponsors (Glass sutil) --- */
.footer-sponsors {
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-color-glass);
}

.sponsor-title {
  color: var(--corp-blue-dark);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 1rem;
}

.sponsor-card {
  background: var(--corp-white);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
  transition: var(--transition-smooth);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative; /* Necesario para enlaces extendidos (stretched-link) */
}

.sponsor-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(10, 25, 47, 0.08);
}

.sponsor-card img {
  max-height: 80px;
  object-fit: contain;
  /* Escala de grises por defecto, color al hacer hover */
  filter: grayscale(80%) opacity(0.8);
  transition: var(--transition-smooth);
}

.sponsor-card:hover img {
  filter: grayscale(0%) opacity(1);
}

/* Slider de Aliados */
.sponsor-card-slide {
  padding: 1rem;
}

.sponsor-card-slide img {
  max-height: 80px;
  object-fit: contain;
  margin: 0 auto 0.5rem;
  filter: grayscale(80%) opacity(0.8);
  transition: var(--transition-smooth);
}

.sponsor-card-slide:hover img {
  filter: grayscale(0%) opacity(1);
}

.sponsor-card-slide a {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.sponsor-card-slide:hover a {
  color: var(--corp-blue-accent);
}

/* --- 6.2 Cuerpo Principal del Footer (Azul Oscuro) --- */
.footer-main {
  background-color: var(--corp-blue-dark);
  color: var(--corp-white);
}

.footer-brand {
  color: var(--corp-white);
  font-weight: 700;
}

.footer-text {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

.footer-heading {
  color: var(--corp-white);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: var(--transition-smooth);
  display: inline-block;
}

.footer-links a:hover {
  color: var(--corp-blue-accent);
  transform: translateX(5px); /* Desplazamiento sutil a la derecha */
}

/* --- 6.3 Barra Inferior (Azul más profundo) --- */
.footer-bottom {
  background-color: var(--corp-blue-main);
}

.policy-links {
  color: rgba(255, 255, 255, 0.6);
}

.policy-links a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 0.85rem;
  transition: var(--transition-smooth);
}

.policy-links a:hover {
  color: var(--corp-white);
}

.footer-divider {
  border-color: rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   7. INTERNAL PAGES
   Estilos específicos para páginas internas (no home)
   ========================================================================== */
.page-hero {
  position: relative;
  width: 100%;
  min-height: 45vh; /* Altura reducida en comparación al Home */
  background: url('../../img/campus_upb_1.jpeg') center center / cover no-repeat;
  margin-bottom: 3rem;
  padding: 6rem 0 3rem;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 25, 47, 0.95) 0%, 
    rgba(17, 34, 64, 0.80) 100%
  );
  z-index: 1;
}

/* Estilos de listas dentro de las tarjetas de vidrio */
.format-list .list-group-item {
  color: var(--text-dark);
}

.topic-list {
  list-style-type: none;
  padding-left: 0;
}

.topic-list li {
  position: relative;
  padding-left: 1.5rem;
  line-height: 1.5;
}

/* Viñetas personalizadas (flecha azul) */
.topic-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--corp-blue-accent);
  font-weight: bold;
}

/* ==========================================================================
   8. NAVIGATION BAR
   Estilos de la barra de navegación superior y menús desplegables
   ========================================================================== */
.navbar-glass {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color-glass);
  padding: 0.8rem 0;
  transition: var(--transition-smooth);
  transform: translateZ(0); /* Fuerza renderizado por hardware */
}

/* Enlaces principales del menú */
.nav-link-custom {
  color: var(--text-dark) !important;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 1rem !important;
  transition: var(--transition-smooth);
  position: relative;
}

/* Subrayado animado en enlaces */
.nav-link-custom::before {
  content: '';
  position: absolute;
  bottom: 2px; 
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px; 
  border-radius: 2px;
  background-color: var(--corp-blue-accent);
  transition: var(--transition-smooth);
}

.nav-link-custom:hover::before,
.nav-link-custom.active::before {
  width: 70%;
}

.dropdown-toggle::after {
  display: none !important; /* Oculta la flecha por defecto de Bootstrap */
}

/* Menú desplegable Glassmorphism */
.dropdown-glass {
  border: 1px solid var(--border-color-glass);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 0.8rem;
  min-width: 220px;
  box-shadow: 0 15px 35px rgba(10, 25, 47, 0.08) !important;
  margin-top: 1.4rem !important;
  animation: slideUpFade 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.dropdown-item {
  border-radius: 8px;
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
  color: var(--text-dark);
  transition: var(--transition-smooth);
  margin-bottom: 2px;
}

.dropdown-item:last-child {
  margin-bottom: 0;
}

/* Hover de los items del menú desplegable */
.dropdown-item:hover,
.dropdown-item.active {
  background-color: rgba(59, 130, 246, 0.08);
  color: var(--corp-blue-accent);
  transform: translateX(4px);
}

/* Animación de entrada para los menús */
@keyframes slideUpFade {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Ajustes responsivos del Navbar */
@media (max-width: 991px) {
  .navbar-glass {
    /* Fondo más sólido en móviles para evitar problemas de lectura */
    background: rgba(255, 255, 255, 0.95); 
  }
  
  .nav-link-custom::before {
    display: none; /* Desactiva la línea inferior en móviles */
  }

  .dropdown-glass {
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    box-shadow: none !important;
    border-left: 2px solid var(--border-color-glass);
    border-radius: 0;
    margin-left: 1rem !important;
    padding-left: 0.5rem;
  }

  .dropdown-item:hover,
  .dropdown-item:focus {
    background-color: transparent !important; /* Quita el cuadro azul de fondo */
    transform: none !important; /* Evita que el texto salte a la derecha */
  }

  /* Quita el parpadeo gris nativo de los celulares al tocar un link */
  .dropdown-item {
    -webkit-tap-highlight-color: transparent; 
  }
}


/* ==========================================================================
   10. FEES PAGE
   Estilos exclusivos de la página de tarifas y pagos
   ========================================================================== */

.elegant-card thead th {
  background-color: rgba(17, 34, 64, 0.05);
  border-bottom: 2px solid rgba(17, 34, 64, 0.1);
 /* color: var(--corp-blue-dark) !important; */
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}

.elegant-card tbody td {
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding: 1rem 0.75rem;
}

.elegant-card tbody tr:last-child td {
  border-bottom: none;
}

.elegant-card tbody tr:nth-child(even) {
  background-color: rgba(59, 130, 246, 0.02);
}

/* Prevent price + currency symbol from wrapping on mobile */
.elegant-card td:not(:first-child) {
  white-space: nowrap;
}

.list-group-item {
  border-color: rgba(0, 0, 0, 0.06) !important;
  padding: 0.75rem 0;
}

.list-group-item:last-child {
  border-bottom: none !important;
}

.btn-accent-glow {
  background-color: var(--corp-blue-main);
  color: var(--corp-white) !important;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  transition: var(--transition-smooth);
}

.btn-accent-glow:hover {
  transform: translateY(-2px);
  background-color: var(--corp-blue-accent);
  box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.3);
}