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

html, body {
  height: 100%;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  color: #0e746e;
  display: flex;
  flex-direction: column;
}


.contenedor {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  align-items: center;
  text-align: center;
}


header {
  background-color: #1b6d69;
  color: #fff;
  padding: 20px;
  width: 100%;
}

header h1 {
  margin-bottom: 10px;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

nav a {
  color: #fff;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}


main {
  flex: 1;
  padding: 20px;
  width: 100%;
  max-width: 800px;
}

section, article {
  background-color: #fff;
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}


footer {
  background-color: #1d6969;
  color: #ccc;
  text-align: center;
  padding: 15px;
  width: 100%;
}