:root {
  --kaptan-ink: #142033;
  --kaptan-blue: #1769aa;
  --kaptan-sky: #e8f3fb;
  --kaptan-border: #d4dfeb;
}

.content main {
  max-width: 58rem;
  margin: 0 auto;
}

.content h1,
.content h2,
.content h3 {
  color: var(--kaptan-ink);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.content h1 {
  border-bottom: 3px solid var(--kaptan-blue);
  padding-bottom: 0.45rem;
}

.content a {
  color: var(--kaptan-blue);
}

.content table {
  border: 1px solid var(--kaptan-border);
  border-radius: 0.5rem;
  overflow: hidden;
}

.content blockquote {
  border-left-color: var(--kaptan-blue);
  background: var(--kaptan-sky);
}

.sidebar .sidebar-scrollbox {
  border-right: 1px solid var(--kaptan-border);
}

.nav-chapters {
  border-top: 1px solid var(--kaptan-border);
}