style.css

@font-face {
  font-family: "IBM Plex Sans";
  src: local("IBM Plex Sans"), url("fonts/IBMPlexSans-Regular.ttf");
}

@font-face {
  font-family: "IBM Plex Sans";
  src: local("IBM Plex Sans SemiBold"), url("fonts/IBMPlexSans-SemiBold.ttf");
  font-weight: 500;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: local("IBM Plex Mono"), url("fonts/IBMPlexMono-Regular.ttf");
}

:root {
  --color-primary: #126bbe;
  --border-color: #ddd;
  --border-radius: 0.3rem;
  --spacing-1: 0.5rem;
  --spacing-2: 1rem;
  --spacing-3: 2rem;
  --spacing-4: 4rem;
  --spacing-5: 8rem;
  --spacing-6: 16rem;

  font-size: 1rem;
  font-family:
    "IBM Plex Sans",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Oxygen,
    Ubuntu,
    Cantarell,
    "Open Sans",
    "Helvetica Neue",
    sans-serif;

  accent-color: var(--color-primary);
}

header,
main,
footer {
  max-width: 80ch;
  margin: 0 auto;
}

header {
  nav {
    margin: var(--spacing-1) 1rem var(--spacing-3) 1rem;
    display: flex;
    justify-content: space-between;
    font-weight: 500;
    a {
      text-decoration: none;
    }
    menu {
      display: flex;
      flex-wrap: wrap;
      gap: var(--spacing-1) var(--spacing-2);
      list-style-type: none;
      padding: 0;
      margin: 0;
    }
  }
}

@media (max-width: 50ch) {
  header {
    menu {
      flex-direction: column;
    }
  }
}

/* content sections */

section#hero {
  /* margin-bottom: var(--spacing-4); */
  hgroup {
    text-align: center;
    margin: var(--spacing-4) 0;

    h1 {
      font-size: 3rem;
      animation: fade-in 1s linear;
      -webkit-mask-repeat: no-repeat;
      letter-spacing: 0.2rem;
      font-weight: 300;
    }

    p {
      font-weight: 500;

      span {
        display: inline-block;
      }
    }
  }

  > p {
    font-size: 1.2rem;
  }
}

section#resources {
  ul {
    list-style-type: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);

    li {
      flex: 1;
    }

    a {
      display: flex;
      gap: var(--spacing-1);
      align-items: center;
      /* background-color: #f2f2f2; */
      border: 0.1rem var(--border-color) solid;
      border-radius: var(--border-radius);
      padding: var(--spacing-2) var(--spacing-3);
      color: var(--color-primary);
      justify-content: center;
    }

    a svg {
      height: 1.5rem;
      width: 1.5rem;
    }
  }
}

footer {
  padding: var(--spacing-4) 0;

  ul {
    display: flex;
    flex-direction: column;
    list-style-type: none;
    padding: 0;
    gap: var(--spacing-2);

    li {
      text-align: center;
    }
  }
}

/* animations */

@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

/* layout */
section {
  /* margin-bottom: var(--spacing-4); */
  border: solid black;
  border-radius: 1rem;
  margin: 0 1rem;
  padding: 1rem;
}

hr {
  border: none;
  height: 100%;
  margin: 0;
}
hr::after {
  content: "";
  background-image: url("data:image/svg+xml,%3Csvg width='16' height='80' viewBox='0 0 16 80' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M7.29289 79.7071C7.68342 80.0976 8.31658 80.0976 8.70711 79.7071L15.0711 73.3431C15.4616 72.9526 15.4616 72.3195 15.0711 71.9289C14.6805 71.5384 14.0474 71.5384 13.6569 71.9289L8 77.5858L2.34315 71.9289C1.95262 71.5384 1.31946 71.5384 0.928932 71.9289C0.538408 72.3195 0.538408 72.9526 0.928932 73.3431L7.29289 79.7071ZM7 0V79H9V0L7 0Z' fill='black'/%3E%3C/svg%3E%0A");
  text-align: center;
  display: block;
  color: black;
  background-size: 1rem auto;
  background-position: center bottom;
  background-repeat: no-repeat;
  height: 4rem;
}

div#language-hint {
  padding: var(--spacing-2);
  background-color: #f2f2f2;
  display: flex;
  justify-content: space-between;
  margin: var(--spacing-2);
  border-radius: 1rem;
  align-items: center;

  button {
    display: flex;
    align-items: center;
    background: none;
    border: solid 0.1rem;
    gap: var(--spacing-1);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--border-radius);

    svg {
      height: 1.5rem;
      width: 1.5rem;
    }
  }
}

/* normalize */
body {
  /* font-size: 18px; */
  line-height: 1.7;
  margin: var(--spacing-2) 0;
}

a {
  color: var(--color-primary);
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 500;
}

h1,
h2,
h3,
h4,
p,
blockquote {
  margin: 0;
  margin-top: 1em;
}

h2 {
  font-size: 2rem;
  text-align: center;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1rem;
  font-weight: bold;
}

h2::before {
  /* content: "→ "; */
}

hgroup > * {
  margin: 0;
}
hgroup > h2 + p {
  text-align: center;
}
:where(h1, h2, h3, p):first-child {
  margin: 0;
}

blockquote {
  border-left: solid var(--border-color) 0.2rem;
  padding: var(--spacing-1) var(--spacing-2);
}

.hidden {
  display: none !important;
}