:root {
  --azul: #15406b;
  --fondo: #f1f4f8;
}

body {
  background: var(--fondo);
}

.app-nav {
  background: var(--azul);
  color: #fff;
}

.app-nav .navbar-brand {
  color: #fff;
  font-weight: 600;
}

.nav-pills .nav-link {
  color: var(--azul);
  font-weight: 500;
}

.nav-pills .nav-link.active {
  background: var(--azul);
  color: #fff;
}

.card {
  border: 0;
  border-radius: .6rem;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(16, 42, 67, .12);
}

.card-header.app-head {
  background: var(--azul);
  color: #fff;
  font-weight: 600;
  font-size: 1.05rem;
  padding: .75rem 1rem;
}

.form-card {
  max-width: 820px;
}

.seccion {
  background: #e8eef6;
  font-weight: 600;
  padding: .35rem .75rem;
  border-radius: .35rem;
  margin: 1rem 0 .75rem;
}

.form-control[readonly],
.form-select:disabled {
  background-color: #eef1f5;
}

.foto-preview {
  display: block;
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: .5rem;
  border: 1px solid #cfd6df;
  background: #fff;
}

.foto-mini {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid #cfd6df;
  background: #fff;
}

.tabla-alumnos tbody tr:hover {
  background: #f5f9ff;
}

#filtro {
  min-width: 220px;
}