.chapter h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text);
  line-height: 1.2;
  word-break: normal;
  hyphens: none;
}

.chapter h2 {
  font-size: 1.8rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  color: var(--text);
  line-height: 1.3;
  word-break: normal;
  hyphens: none;
}

.chapter h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2rem 0 0.8rem;
  color: var(--text);
  line-height: 1.3;
  word-break: normal;
  hyphens: none;
}

.chapter h4 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.5rem 0 0.6rem;
  color: var(--text);
  word-break: normal;
  hyphens: none;
}

.chapter p {
  margin: 1rem 0;
  max-width: 70ch;
  word-break: normal;
  overflow-wrap: normal;
  hyphens: none;
}

.chapter ul,
.chapter ol {
  margin: 1rem 0;
  padding-left: 2rem;
  max-width: 70ch;
}

.chapter li {
  margin: 0.5rem 0;
  word-break: normal;
  overflow-wrap: normal;
  hyphens: none;
}

.chapter blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--accent);
  background: var(--code-bg);
  font-style: italic;
}

.chapter code {
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--text);
}

.chapter pre {
  background: var(--code-bg);
  padding: 1.5rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
}

.chapter pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

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

.chapter a:hover {
  border-bottom-color: var(--accent);
}

/* Ensure links in italic text also use accent color */
.chapter i a,
.chapter em a {
  color: var(--text);
}

.chapter i a:hover,
.chapter em a:hover {
  color: var(--accent);
}

.dark .chapter i a,
.dark .chapter em a {
  color: var(--text);
}

.dark .chapter i a:hover,
.dark .chapter em a:hover {
  color: var(--accent);
}

.dark .chapter a {
  color: var(--accent);
}

.chapter hr {
  margin: 3rem 0;
  border: none;
  border-top: 1px solid var(--border);
}

/* Hide hr before headers */
.chapter hr:has(+ h1),
.chapter hr:has(+ h2),
.chapter hr:has(+ h3),
.chapter hr:has(+ h4) {
  display: none !important;
}

.chapter table {
  width: 100%;
  margin: 2rem 0;
  border-collapse: collapse;
}

.chapter th,
.chapter td {
  padding: 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.chapter th {
  background: var(--code-bg);
  font-weight: 600;
}

/* Math rendering */
.katex-display {
  margin: 2rem 0;
  overflow-x: auto;
  overflow-y: hidden;
  font-size: 1.1em;
}

.katex {
  font-size: 1.05em;
}

/* Inline math in dark mode */
.dark .katex {
  color: var(--text);
}

/* References section (typically at end of chapters) */
.chapter h2:has(+ p a[href^="http"]) {
  border-top: 2px solid var(--border);
  padding-top: 2rem;
  margin-top: 3rem;
}

/* Remove border-top when References h2 is preceded by hr */
.chapter hr + h2[id*="references"] {
  /*border-top: none !important;*/
}