/* Book Reader Styles */

.book-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.book-sidebar {
  background: var(--gray-50);
  border-right: 1px solid var(--gray-200);
  padding: 2rem 1.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--gray-300);
}

.back-link {
  display: inline-block;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1rem;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--gray-900);
}

.sidebar-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
}

.book-nav {
  font-size: 0.875rem;
}

.book-nav a {
  display: block;
  color: var(--gray-700);
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  margin-bottom: 0.25rem;
  transition: all 0.2s;
  line-height: 1.4;
}

.book-nav a:hover {
  background: white;
  color: var(--gray-900);
}

.book-nav a.active {
  background: var(--gray-900);
  color: white;
  font-weight: 500;
}

.book-nav a.level-1 {
  font-weight: 600;
  margin-top: 1rem;
  padding-left: 0.75rem;
}

.book-nav a.level-2 {
  padding-left: 1.5rem;
  font-size: 0.85rem;
}

.book-nav a.level-3 {
  padding-left: 2.25rem;
  font-size: 0.8rem;
  color: var(--gray-600);
}

.book-content {
  background: white;
  overflow-y: auto;
}

.book-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 3rem;
}

.loading {
  text-align: center;
  color: var(--gray-500);
  padding: 4rem 0;
  font-size: 1.125rem;
}

/* Book Typography */

.book-container h1 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
  margin: 3rem 0 1.5rem;
  color: var(--gray-900);
  letter-spacing: -0.02em;
}

.book-container h1:first-child {
  margin-top: 0;
}

.book-container h2 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 2.5rem 0 1.25rem;
  color: var(--gray-900);
  padding-top: 2rem;
  border-top: 1px solid var(--gray-200);
}

.book-container h2:first-child {
  border-top: none;
  padding-top: 0;
}

.book-container h3 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 2rem 0 1rem;
  color: var(--gray-900);
}

.book-container h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--gray-800);
}

.book-container p {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.125rem;
  line-height: 1.8;
  margin: 1.25rem 0;
  color: var(--gray-800);
}

.book-container strong {
  font-weight: 600;
  color: var(--gray-900);
}

.book-container em {
  font-style: italic;
}

.book-container a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  transition: all 0.2s;
}

.book-container a:hover {
  color: var(--gray-900);
  border-bottom-color: var(--gray-900);
}

.book-container ul, .book-container ol {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

.book-container li {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.125rem;
  line-height: 1.8;
  margin: 0.75rem 0;
  color: var(--gray-800);
}

.book-container ul {
  list-style-type: disc;
}

.book-container blockquote {
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  border-left: 4px solid var(--accent);
  background: var(--gray-50);
  border-radius: 0 8px 8px 0;
}

.book-container blockquote p {
  color: var(--gray-700);
  font-style: italic;
}

.book-container pre {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--gray-900);
  border-radius: 8px;
  overflow-x: auto;
}

.book-container code {
  font-family: 'JetBrains Mono', 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
}

.book-container pre code {
  color: var(--gray-100);
  font-size: 0.875rem;
  line-height: 1.7;
}

.book-container :not(pre) > code {
  background: var(--gray-100);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  color: var(--accent);
  font-size: 0.9em;
}

.book-container hr {
  border: none;
  border-top: 2px solid var(--gray-200);
  margin: 3rem 0;
}

.book-container table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.book-container th {
  background: var(--gray-900);
  color: white;
  padding: 0.75rem;
  text-align: left;
  font-weight: 600;
}

.book-container td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--gray-200);
}

.book-container tr:hover {
  background: var(--gray-50);
}

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

  .book-sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--gray-200);
  }

  .book-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .book-nav a {
    margin: 0;
  }
}

@media (max-width: 640px) {
  .book-container {
    padding: 2rem 1.5rem;
  }

  .book-container h1 {
    font-size: 2rem;
  }

  .book-container h2 {
    font-size: 1.5rem;
  }

  .book-container h3 {
    font-size: 1.25rem;
  }

  .book-container p,
  .book-container li {
    font-size: 1rem;
  }

  .book-container pre {
    padding: 1rem;
  }
}