/* Estilos generales */

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

header {
  background-color: #333;
  color: #fff;
  padding: 10px;
}

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

nav ul li {
  display: inline;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  padding: 10px;
}

main {
  padding: 20px;
}

section {
  margin-bottom: 40px;
}

h2 {
  font-size: 24px;
  color: #333;
}

form {
  margin-bottom: 20px;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 10px;
  margin-bottom: 10px;
}

input[type="submit"] {
  background-color: #333;
  color: #fff;
  padding: 10px 20px;
  border: none;
  cursor: pointer;
}

footer {
  background-color: #333;
  color: #fff;
  padding: 10px;
  text-align: center;
}


/* Estilos responsive */

@media only screen and (min-width: 768px) {
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  nav ul li {
    margin-right: 10px;
  }

  main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  footer {
    display: none;
  }
}

@media only screen and (max-width: 767px) {
  nav ul {
    display: flex;
    flex-direction: column;
  }

  nav ul li {
    margin-bottom: 5px;
  }

  main {
    padding: 10px;
  }
}

@media only screen and (max-width: 500px) {
  h2 {
    font-size: 20px;
  }
}