/* Estructura general */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: white;
  color: #333;
}

/* Menu */
nav {
  background-color: black;
  width: 100%;
}

.menu {
  list-style: none;
  display: flex;
  justify-content: center;
}

.menu > li {
  display: flex;
  justify-content: center;
  width: 100%;
  position: relative;
}

.menu > li:hover {
  background-color: black;
}

.menu > li > a {
  display: block;
  padding: 15px 25px;
  color: white;
  text-decoration: none;
  transition: background-color 0.3s;
}

.menu > li > a:hover {
  background-color: #444;
}

/* Submenu */
.submenu {
  list-style: none;
  display: none;
  position: absolute;
  background-color: #333;
  top: 100%;
  left: 0;
  min-width: 200px;
  z-index: 1000;
  width: 100%;
}

.submenu > li {
  display: flex;
  justify-content: center;
}

.submenu li a {
  padding: 12px 20px;
  display: block;
  color: white;
  text-decoration: none;
  transition: background-color 0.3s;
}

/* Contenido principal */
main {
  padding: 20px;
}

/* Secciones */
section {
  margin-bottom: 20px;
}

/* Pie de página */
footer {
  background-color: black;
  color: white;
  padding: 10px;
  text-align: center;
  margin-top: 40px;
}

/* Responsivo */
@media (max-width: 768px) {
  nav {
    display: flex;
    flex-direction: column;
  }
  nav a {
    margin: 5px 0;
  }
}