/* Light styling for better readability in textbook mode. */

:root {
  --book-accent: #145c8f;
  --book-accent-soft: #e9f3fa;
}

h1, h2, h3 {
  color: var(--book-accent);
}

.callout-tip {
  border-left: 4px solid var(--book-accent);
}

blockquote {
  background: var(--book-accent-soft);
  border-left: 4px solid var(--book-accent);
  padding: 0.8rem 1rem;
}

.book-cover {
  display: block;
  width: min(420px, 85vw);
  margin: 1rem auto 1.5rem auto;
  border-radius: 12px;
  box-shadow: 0 12px 28px rgba(16, 41, 61, 0.22);
}