* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background-color: #f1f5f9;
}

.encabezado {
  background-color: #1a2b4c;
  color: #ffffff;
  text-align: center;
  padding: 25px 0 10px 0;
}

.menu-nav {
  background-color: #1a2b4c;
  padding-bottom: 20px;
}

.menu-nav > ul {
  list-style: none;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

.menu-nav a {
  display: inline-block;
  color: #ffffff;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 6px;
  transition: all 0.3s ease;
}

.menu-nav a:hover {
  background-color: #2563eb; /* Azul claro */
  transform: translateY(-2px); /* Eleva el botón */
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.menu-practicas {
  position: relative;
}

.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #1a2b4c;
  min-width: 160px;
  list-style: none;
  border-radius: 6px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  z-index: 10;
  padding: 5px 0;
}

.menu-practicas:hover .submenu {
  display: block;
}

.submenu li a {
  display: block;
  padding: 10px 15px;
  width: 100%;
  border-radius: 0;
}

.submenu li a:hover {
  background-color: #2563eb;
  transform: none;
}


main {
  padding: 40px 20px;
  display: flex;
  justify-content: center;
}

.contenedor-cajas {
  display: flex;
  flex-direction: column;
  gap: 20px; 
  max-width: 800px;
  width: 100%;
}

.tarjeta {
  width: 100%;
  background-color: #ffffff;
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  border-left: 5px solid #2563eb;
}

.tarjeta h2 {
  color: #1a2b4c;
  margin-bottom: 15px;
  font-size: 1.5rem;
}

.tarjeta p {
  color: #334155;
  line-height: 1.6;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

footer {
  background-color: #1a2b4c;
  color: #ffffff;
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}