:root {
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
  color: #24292f;
  background: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
}

.page-width {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  padding: 6px 10px;
  background: #ffffff;
  border: 1px solid #d0d7de;
}

.skip-link:focus {
  left: 8px;
}

.site-header {
  border-bottom: 1px solid #d0d7de;
  padding: 20px 0 12px;
}

.site-name {
  margin: 0 0 10px;
  font-weight: 700;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  font-size: 0.95rem;
}

a {
  color: #0969da;
}

a:hover,
a:focus {
  text-decoration-thickness: 2px;
}

nav a[aria-current="page"] {
  color: #24292f;
  font-weight: 700;
  text-decoration: none;
}

main {
  padding: 36px 0 28px;
}

.course-name {
  margin: 0 0 4px;
  color: #57606a;
}

h1,
h2 {
  line-height: 1.25;
}

h1 {
  margin: 0 0 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid #d0d7de;
  font-size: 2rem;
}

h2 {
  margin-top: 32px;
  font-size: 1.35rem;
}

ul {
  padding-left: 24px;
}

li + li {
  margin-top: 6px;
}

pre {
  overflow-x: auto;
  padding: 12px;
  border: 1px solid #d0d7de;
  background: #f6f8fa;
  font-size: 0.88rem;
  line-height: 1.45;
}

footer {
  border-top: 1px solid #d0d7de;
  padding: 16px 0 28px;
  color: #57606a;
  font-size: 0.9rem;
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 1.7rem;
  }
}