* {
    box-sizing: border-box;
  }

  body {
    margin: 0;
    font-family: Arial, sans-serif;
  }

  .menu-toggle {
    display: none;
    background-color: #1a1a2e;
    color: white;
    padding: 15px;
    border: none;
    width: 100%;
    text-align: left;
    font-size: 18px;
    cursor: pointer;
  }

  nav#menu {
    width: 220px;
    background-color: #1a1a2e;
    color: white;
    height: 100vh;
    overflow-y: auto;
    padding-top: 20px;
    position: fixed;
    top: 0;
    left: 0;
    transition: transform 0.3s ease;
    z-index: 1000;
  }

  nav#menu ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
  }

  nav#menu ul li {
    border-bottom: 1px solid #333;
  }

  nav#menu ul li a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    transition: background-color 0.3s;
  }

  nav#menu ul li a:hover {
    background-color: #16213e;
  }

  nav#menu ul li a.active {
    background-color: #0f3460;
  }

  .content {
    margin-left: 220px;
    padding: 20px;
    background-color: #f4f4f4;
    transition: margin-left 0.3s ease;
  }

  /* Modo colapsado */
  nav#menu.hidden {
    transform: translateX(-100%);
  }

  .content.menu-hidden {
    margin-left: 0;
  }

  /* Mostrar botón en todas las resoluciones */
  .menu-toggle {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1100;
  }

  @media (min-width: 769px) {
    .menu-toggle {
      display: none;
    }

  .fondo-transparente {
    background-color: rgba(0, 0, 0, 0.5);
  }

  }