* {
  padding: 0;
  margin: 0;
  font-family: Avenir, sans-serif;
}

:root {
  --text-color: #000000;
  --bg-color: #FFFFFF;
  --primary-color: #005EBF;
  --primary-alpha: #005EBF50;
}
:root.darkMode {
  --text-color: #FFFFFF;
  --bg-color: #000000;
}

body {
  color: var(--text-color);
  background-color: var(--bg-color);
}

header {
  background-color: var(--primary-color);
  color: #FFFFFF;
  padding: 64px;
}

a {
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
}

header a {
  color: #FFFFFF;
  font-weight: 300;
}

.section {
  padding: 64px;
}
.cards {
  display: flex;
  flex-direction: row;
}
.card {
  padding: 16px;
  background-color: var(--primary-alpha);
}

button {
  color: var(--primary-color);
  background-color: var(--primary-alpha);
  padding: 8px 16px;
  margin: 0 4px;
  outline: none;
  border: none;
  border-radius: 4px;
  transition-duration: 0.4s;
}
button:hover,
buton:active {
  color: #FFFFFF;
  background-color: var(--primary-color);
}

.tabs {
  padding: 8px;
  text-align: center;
  border-radius: 8px;
  border: solid 1.5px var(--primary-color);
}
body > .tabs {
  margin: 0 16px;
}
.avatar, #avatar {
  height: 256px;
  border-radius: 128px;
}


@media only screen and (max-width: 480px) {
  header, .section, footer {
    padding: 16px;
  }
  header {
    text-align: center;
  }
  .avatar, #avatar {
    height: 192px;
  }
  .cards {
    flex-direction: column;
  }
  .card {
    border: solid 1.5px var(--primary-color);
    border-radius: 8px;
    margin: 4px 0;
  }
  .card img {
    width: 100%;
    border-radius: 4px;
  }
}