:root {
  /* Paleta de colores principal */
  --color-primary: #0c1228;    /* Azul oscuro principal */
  --color-secondary: #1a2a5f;  /* Azul un poco más claro */
  --color-accent: #4a90e2;     /* Azul claro para acentos */
  --color-text: #ffffff;       /* Texto blanco */
  --color-text-secondary: #e0e0e0; /* Texto gris claro */
  --color-card: #1a1f3a;       /* Fondo de tarjetas */
  --color-success: #28a745;    /* Verde para éxito */
  --color-warning: #ffc107;    /* Amarillo para advertencias */
  --color-danger: #dc3545;     /* Rojo para errores */
  --color-light: #f8f9fa;      /* Fondo claro */
  --color-dark: #343a40;       /* Texto oscuro */
  
  /* Sombras */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 6px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
  
  /* Bordes */
  --border-radius: 8px;
  --border-color: rgba(255, 255, 255, 0.1);
}

/* Estilos base */
body {
  background-color: var(--color-primary);
  color: var(--color-text);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
}

/* Encabezados */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Enlaces */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: lighten(var(--color-accent), 10%);
  text-decoration: none;
}

/* Tarjetas */
.card {
  background-color: var(--color-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  margin-bottom: 1.5rem;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

/* Botones */
.btn {
  border-radius: var(--border-radius);
  padding: 0.5rem 1.25rem;
  font-weight: 500;
  transition: all 0.3s ease;
  border: none;
}

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

.btn-primary:hover {
  background-color: darken(#4a90e2, 10%);
  box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
  transform: translateY(-2px);
}

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

.btn-outline-primary:hover {
  background-color: var(--color-accent);
  color: white;
  box-shadow: 0 4px 12px rgba(74, 144, 226, 0.3);
}

/* Modales */
.modal-content {
  background-color: var(--color-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  color: var(--color-text);
}

.modal-header {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--color-secondary);
}

.modal-title {
  color: var(--color-text) !important;
}

.modal-body {
  color: var(--color-text-secondary);
  background-color: var(--color-card);
}

.modal-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--color-secondary);
}

/* Formularios */
.form-control {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--color-text);
  border-radius: var(--border-radius);
  padding: 0.5rem 0.75rem;
}

.form-control:focus {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-accent);
  color: var(--color-text);
  box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
}

/* Tablas */
.table {
  color: var(--color-text);
  background-color: var(--color-card);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.table thead th {
  background-color: var(--color-secondary);
  border-bottom: 2px solid var(--border-color);
}

.table td, .table th {
  border-top: 1px solid var(--border-color);
  padding: 0.75rem;
  vertical-align: middle;
}

/* Alertas */
.alert {
  border-radius: var(--border-radius);
  border: none;
  color: white;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

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

.alert-success {
  background-color: var(--color-success);
}

.alert-warning {
  background-color: var(--color-warning);
  color: var(--color-dark);
}

.alert-danger {
  background-color: var(--color-danger);
}

/* Secciones */
.section {
  padding: 4rem 0;
  position: relative;
}

/* Barra de navegación */
.navbar {
  background-color: var(--color-primary) !important;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 0.75rem 1.5rem;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-text) !important;
}

.nav-link {
  color: var(--color-text-secondary) !important;
  font-weight: 500;
  padding: 0.5rem 1rem;
  margin: 0 0.25rem;
  border-radius: var(--border-radius);
  transition: all 0.3s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-text) !important;
  background-color: rgba(255, 255, 255, 0.1);
}

/* Pie de página */
.footer {
  background-color: var(--color-secondary);
  color: var(--color-text-secondary);
  padding: 3rem 0 1.5rem;
  margin-top: 3rem;
}

.footer a {
  color: var(--color-text-secondary);
  transition: color 0.3s ease;
}

.footer a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* Utilidades */
.text-primary {
  color: var(--color-accent) !important;
}

.bg-primary {
  background-color: var(--color-primary) !important;
}

.bg-secondary {
  background-color: var(--color-secondary) !important;
}

.bg-accent {
  background-color: var(--color-accent) !important;
}

/* Animaciones */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.5s ease-out forwards;
}

/* Responsive */
@media (max-width: 768px) {
  .section {
    padding: 2.5rem 0;
  }
  
  .card {
    margin-bottom: 1rem;
  }
}