:root {
  --book-navy: #0b1f33;
  --book-blue: #1769aa;
  --book-accent: #168bb8;
  --book-accent-light: #dff3fa;
  --book-text: #1f2933;
  --book-muted: #5b6877;
  --book-surface: #f5f8fa;
  --book-border: #d7e0e7;
}

body {
  color: var(--book-text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
}

#quarto-content main {
  max-width: 850px;
}

h1, h2, h3, h4 {
  color: var(--book-navy);
  font-weight: 650;
  line-height: 1.25;
  text-wrap: balance;
}

h1.title {
  font-size: clamp(2.25rem, 5vw, 3.8rem);
  letter-spacing: -0.035em;
}

h2 {
  margin-top: 2.6rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--book-border);
}

a {
  color: var(--book-blue);
  text-underline-offset: 0.16em;
}

a:hover {
  color: #0e4e80;
}

.sidebar-title,
.sidebar-item .chapter-number {
  color: var(--book-navy);
}

.sidebar-item-container .active {
  color: var(--book-blue);
  font-weight: 650;
}

.sidebar-item-section > .sidebar-item-container {
  margin-top: 0.7rem;
  letter-spacing: 0.015em;
}

table {
  font-size: 0.94rem;
  border-color: var(--book-border);
}

thead {
  color: var(--book-navy);
  background: var(--book-accent-light);
}

tbody tr:nth-child(even) {
  background: var(--book-surface);
}

pre,
code,
kbd,
samp {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

pre {
  border: 1px solid var(--book-border);
  border-left: 4px solid var(--book-accent);
  border-radius: 0.4rem;
}

:not(pre) > code {
  color: #75401a;
  background: #f4eee9;
  border-radius: 0.25rem;
  padding: 0.1em 0.28em;
}

blockquote {
  color: #334759;
  background: var(--book-surface);
  border-left: 4px solid var(--book-accent);
  padding: 0.9rem 1.2rem;
}

.callout {
  border-radius: 0.45rem;
  box-shadow: none;
}

.figure-caption,
.table-caption,
figcaption {
  color: var(--book-muted);
  font-size: 0.9rem;
}

.quarto-cover-image {
  display: block;
  width: min(390px, 72vw);
  margin: 0 auto 2.5rem;
  border-radius: 0.35rem;
  box-shadow: 0 18px 45px rgb(11 31 51 / 22%);
}

.book-landing .btn-primary {
  margin-top: 0.8rem;
  color: #fff;
  background: var(--book-blue);
  border-color: var(--book-blue);
}

.book-landing .btn-primary:hover {
  color: #fff;
  background: var(--book-navy);
  border-color: var(--book-navy);
}

.nav-footer {
  color: var(--book-muted);
  border-top: 1px solid var(--book-border);
  background: #fff;
}

@media (max-width: 767px) {
  body {
    line-height: 1.62;
  }

  h1.title {
    font-size: 2.25rem;
  }

  .quarto-cover-image {
    width: min(320px, 82vw);
  }
}

@media print {
  a {
    color: var(--book-text);
  }

  .quarto-cover-image {
    box-shadow: none;
  }
}