body {
    background-color: #f4f6f9;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  }
  
  .navbar-brand {
    font-weight: bold;
    font-size: 1.2rem;
  }
  
  .sidebar {
    height: 100vh;
    border-right: 1px solid #dee2e6;
  }
  
  .nav-link {
    color: #333;
    transition: all 0.2s;
  }
  
  .nav-link:hover {
    background-color: #e9ecef;
    border-radius: 5px;
  }
  
  .card {
    border-radius: 12px;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  }
  
  h4 {
    color: #0d6efd;
    font-weight: 600;
  }
  
  .btn-success {
    background-color: #198754;
    border-color: #198754;
  }
  
  .btn-success:hover {
    background-color: #157347;
    border-color: #146c43;
  }
  
  .btn-primary {
    background-color: #0d6efd;
    border-color: #0d6efd;
  }
  
  .btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
  }

  .contenedor-estrecho {
    max-width: 95%;
    margin: 0 auto;
  }
  
  #mensaje-procesando {
    display: none !important;
  }