* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
  --font-serif: 'Charter', 'Georgia', serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.book-layout {
  display: grid;
  grid-template-columns: 280px 1fr 200px;
  gap: 2rem;
  max-width: 1600px;
  margin: 0 auto;
  padding: 2rem;
}

.chapter-content {
  position: relative;
  max-width: 800px;
  padding: 0 1rem;
}

@media (max-width: 1200px) {
  .book-layout {
    grid-template-columns: 280px 1fr;
  }

  .chapter-toc {
    display: none;
  }
}

@media (max-width: 1024px) {
  .book-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
  }
}

/* SVG diagrams */
.chapter svg,
.chapter img {
  max-width: 100%;
  height: auto;
  margin: 2rem 0;
}

article p image {
  max-width: 100% !important;
}

/* Print styles for individual chapters */
@media print {
  .sidebar,
  .chapter-toc,
  .toolbar-actions,
  .breadcrumbs,
  .chapter-navigation {
    display: none !important;
  }

  .book-layout {
    grid-template-columns: 1fr;
  }

  .chapter-content {
    max-width: none;
  }
}