/* ==========================================================================
   1. BASE STYLES
   Configuración global del documento
   ========================================================================== */
body {
  background-color: var(--bg-page);
  color: var(--text-dark);
  /* Fondo con degradados radiales fijos para dar textura sutil */
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(10, 25, 47, 0.05), transparent 25%);
  background-attachment: fixed;
}

/* ==========================================================================
   2. CSS VARIABLES
   Paleta de colores y configuraciones globales (NO MODIFICADAS)
   ========================================================================== */
:root {
  /* Paleta Corporativa */
  --corp-blue-dark: #0A192F;
  --corp-blue-main: #112240;
  --corp-blue-accent: #3b82f6;
  --corp-white: #FFFFFF;
  
  /* Textos y Acentos */
  --text-dark: #1e293b;
  --text-muted: #64748b;
  --accent: #b9a21b;
  --bg-page: #F8FAFC;
  
  /* UI Elements */
  --border-color-glass: rgba(59, 130, 246, 0.2); /* Borde azul sutil semitransparente */
  --transition-smooth: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* ==========================================================================
   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);
}

/* ==========================================================================
   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;
}

/* ==========================================================================
   5. COORDINATORS
   Tarjetas de perfiles de coordinadores con imagen completa
   ========================================================================== */
.coordinator-card {
  border-radius: 16px;
  overflow: hidden;
  background: #f8f9fa;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.coordinator-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

/* Contenedor y comportamiento de la imagen */
.coordinator-image-container {
  position: relative;
  width: 100%;
  height: 400px;
  overflow: hidden;
}

.coordinator-full-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  transition: transform 0.5s ease;
}

.coordinator-card:hover .coordinator-full-img {
  transform: scale(1.05);
}

/* Gradiente superpuesto en la parte inferior de la imagen */
.coordinator-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0.5) 60%, transparent 100%);
  padding: 2rem 1.5rem 1.5rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.coordinator-card:hover .coordinator-overlay {
  opacity: 1;
}

/* Información del coordinador (Nombre y Rol) */
.coordinator-info {
  text-align: center;
  color: white;
}

.coordinator-name {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 700;
  color: white;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.coordinator-role {
  font-size: 0.875rem;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.9);
  min-height: 2.5em;
}

/* Contenido del modal del CV */
.cv-content {
  line-height: 1.6;
  color: #495057;
  text-align: justify;
  text-justify: inter-word;
}

.cv-content p {
  margin-bottom: 1rem;
}

.cv-content ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

/* Ajustes responsivos para las tarjetas de coordinadores */
@media (max-width: 768px) {
  .coordinator-image-container { height: 280px; }
  .coordinator-overlay { padding: 1rem; }
  .coordinator-name { font-size: 1rem; }
  .coordinator-role { font-size: 0.85rem; }
}

@media (max-width: 576px) {
  .coordinator-image-container { 
    height: 200px; 
  }
  
  .coordinator-overlay { 
    padding: 0.8rem 0.5rem; 
  }
  
  .coordinator-name { 
    font-size: 0.9rem; 
    margin-bottom: 2px;
  }
  
  .coordinator-role { 
    font-size: 0.75rem; 
    line-height: 1.2; 
  }
}

/* ==========================================================================
   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;
  }

  /* ===================================================
     NUEVO: Anular el efecto hover en submenús móviles
     =================================================== */
  .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; 
  }
}

/* ==========================================================================
   9. HOME PAGE
   Estilos exclusivos de la página de inicio (Hero y alertas)
   ========================================================================== */
.hero-section {
  position: relative;
  width: 100%;
  min-height: 70vh; 
  background: url('../img/campus_upb_1.webp') center center / cover no-repeat;
  margin-bottom: 3rem;
  padding: 4rem 0;
}

.hero-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 25, 47, 0.90) 0%, 
    rgba(17, 34, 64, 0.70) 100%
  );
  z-index: 1;
}

.hero-text-col, .col-lg-5 {
  position: relative;
  z-index: 2;
}

/* Textos del Hero */
.hero-edition {
  display: inline-block;
  font-size: 0.85rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--corp-white);
  border-bottom: 2px solid var(--corp-white);
  padding-bottom: 0.25rem;
  margin-bottom: 1.5rem;
}

.hero-title-1 {
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1;
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: -1px;
  color: var(--corp-white);
}

.hero-title-2 {
  font-weight: 500;
  text-transform: uppercase;
  line-height: 1;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: -1px;
  color: var(--corp-white);
}

.hero-subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  opacity: 0.85;
  color: var(--corp-white);
}

/* Caja de Alerta en Home */
.hero-alert-box {
  background: rgba(255, 215, 0, 0.1);
  border-left: 4px solid #FFD700;
  border-radius: 8px;
  padding: 1rem 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

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

/* Tarjeta de información flotante en Hero */
.hero-glass-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.glass-title {
  color: var(--corp-white);
  font-weight: 700;
  font-size: 1.5rem;
}

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

.glass-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.glass-value {
  font-weight: 600;
  color: var(--corp-white);
  font-size: 1.1rem;
}