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

html, body {
  height: 100%;
  min-height: 100vh;
}

body {
  font-family: Arial, sans-serif;
  font-size: 16px;
  color: #000;
  line-height: 1.5;
  background-color: #fff;
  padding: 0 20px;
  display: grid;
  grid-template-rows: 10em 1fr 10em;
  min-height: 100vh;
}

header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  background-color: #2a4e0c;
  padding: 10px 20px;
}

.logo img {
  height: 50px;
  max-width: 100%;
}

#mainMenu {
  list-style: none;
  display: flex;
  gap: 10px;
  padding: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}

#mainMenu li a {
  display: inline-block;
  background-color: #fff;
  color: #000;
  text-decoration: none;
  font-weight: bold;
  padding: 10px 15px;
  border-radius: 0.3em;
  border: 1px solid #ccc;
  transition: background 0.3s;
  font-size: 15px;
  white-space: nowrap;
  text-align: center;
}

#mainMenu li a:hover {
  background-color: #ddd;
}

.imagen-unica {
  display: flex;
  justify-content: center;
  margin: 40px 0;
  padding: 0 10px;
}

.imagen-unica img {
  width: 100%;
  max-width: 960px;
  height: auto;
  border-radius: 8px;
  border: 1px solid #ccc;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

footer {
  background-color: #2a4e0c;
  color: white;
  text-align: center;
  padding: 20px;
  font-size: 14px;
  margin-top: auto;
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
  }

  .logo {
    text-align: center;
    width: 100%;
  }

  .logo img {
    margin: 0 auto;
  }

  #mainMenu {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    width: 100%;
  }

  #mainMenu li a {
    font-size: 14px;
    padding: 8px 12px;
    white-space: nowrap;
  }

  .imagen-unica {
    padding: 0 5px;
  }

  .imagen-unica img {
    max-width: 100%;
  }

  footer {
    font-size: 12px;
    line-height: 1.4;
    padding: 15px;
    max-width: 95%;
    margin: 0 auto;
  }
}