:root {
  --espacio-vertical: 40px;
}

html {
  height: 100%;
}

body {
  margin: 0 auto;
  height: 100%;

  background-color: #000;
  font-family: "Open Sans", sans-serif;
  font-size: 1.2rem;
}

.wrapper {
  margin: 0 auto;
  height: 100%;
}

header {
  text-align: center;
  height: 100%;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  background-image: url("../img/bg.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: top right;
}

header .logo {
  width: 200px;
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 0 5px rgba(0, 0, 0, 0.6));
}

header nav {
  margin-top: var(--espacio-vertical);
}

header nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: #000;
  filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.6));
  transition: transform 0.2s ease;
}

header nav a + a {
  margin-top: 0.8em;
}

header nav a .icon {
  height: 35px;
}

header nav a span {
  margin-left: 0.5em;
}

footer {
  position: absolute;
  width: 100%;
  text-align: center;
  margin-top: var(--espacio-vertical);
  filter: drop-shadow(0 0 2px rgba(0, 0, 0, 0.6));
  font-size: 0.8em;
  bottom: 1em;
  left: 0;
}

@media (min-width: 750px) {
  :root {
    --espacio-vertical: 60px;
  }

  header .logo {
    width: 400px;
  }

  header nav a {
    float: left;
  }

  header nav a:hover {
    transform: scale(1.1);
  }

  header nav a + a {
    margin-top: 0;
    margin-left: 2em;
  }

  header nav a span {
    margin-left: 0.5em;
  }
}