/* ==========================================================================
   Geometric Ethics — Book Reader
   Extends the main site's design system for long-form reading.
   Uses the same CSS variables, card patterns, and type scale.
   ========================================================================== */

/* ── Article Shell ──────────────────────────────────────────────────── */
.book-chapter {
  min-height: 100vh;
  padding-top: 60px;                /* room for fixed nav */
}

.chapter-container {
  max-width: 820px;
  margin: 0 auto;
  padding: clamp(32px, 6vw, 80px) clamp(20px, 5vw, 48px) 60px;
}

/* ── Chapter Navigation ─────────────────────────────────────────────── */
.chapter-nav-top,
.chapter-nav-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 13px;
}

.chapter-nav-top {
  padding-bottom: 20px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-subtle);
}

.chapter-nav-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.nav-prev,
.nav-next {
  color: var(--text-secondary);
  max-width: 40%;
  transition: color 0.2s;
  font-weight: 500;
}
.nav-prev:hover,
.nav-next:hover { color: var(--accent-light); }

.nav-next { text-align: right; margin-left: auto; }

.nav-toc {
  color: var(--accent-light);
  font-weight: 600;
  padding: 6px 16px;
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  transition: all 0.25s;
  white-space: nowrap;
}
.nav-toc:hover {
  background: rgba(27,158,119,0.1);
  border-color: var(--accent-light);
  color: var(--accent-light);
}

/* ── In-Chapter TOC ─────────────────────────────────────────────────── */
.chapter-toc {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 24px 28px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}
.chapter-toc::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cb-teal), var(--cb-purple));
}
.chapter-toc h4 {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.chapter-toc ol {
  margin: 0;
  padding-left: 1.3em;
  columns: 2;
  column-gap: 28px;
}
.chapter-toc li {
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  margin-bottom: 6px;
  break-inside: avoid;
  line-height: 1.5;
}
.chapter-toc a { color: var(--text-secondary); transition: color 0.2s; }
.chapter-toc a:hover { color: var(--accent-light); }

/* ── Chapter Content ────────────────────────────────────────────────── */
.chapter-content {
  font-family: 'Crimson Pro', Georgia, 'Times New Roman', serif;
  font-size: 1.125rem;
  line-height: 1.9;
  color: var(--text-primary);
}

.chapter-content p {
  margin-bottom: 1.25em;
}

.chapter-content .first-paragraph::first-line {
  font-variant: small-caps;
  letter-spacing: 0.03em;
}

/* ── Headings ───────────────────────────────────────────────────────── */
h1.chapter-title {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.6em;
  padding-bottom: 0.5em;
  border-bottom: 2px solid var(--border-medium);
  line-height: 1.2;
}

h2.section-heading {
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  font-weight: 600;
  color: var(--accent-light);
  margin-top: 2.8em;
  margin-bottom: 0.7em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--border-subtle);
}

h3.subsection-heading {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 600;
  color: var(--cb2-gold);
  margin-top: 2.2em;
  margin-bottom: 0.6em;
}

h4.subsubsection-heading {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 1.6em;
  margin-bottom: 0.5em;
}

/* ── Block Quotes (same as main site) ───────────────────────────────── */
.book-blockquote {
  border-left: 3px solid var(--cb-gold);
  padding: 16px 24px;
  margin: 1.6em 0;
  background: rgba(230,171,2,0.05);
  border-radius: 0 8px 8px 0;
  color: var(--cb2-gold);
  font-family: 'Crimson Pro', serif;
  font-size: 1.05rem;
  font-style: italic;
}

/* ── Lists ──────────────────────────────────────────────────────────── */
.book-list {
  margin: 1em 0 1.5em 1.5em;
  padding: 0;
}
.book-list li {
  margin-bottom: 0.65em;
  padding-left: 0.3em;
}

/* ── Tables (same card + border pattern as main site) ───────────────── */
.table-wrapper {
  overflow-x: auto;
  margin: 1.8em 0;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
}
.book-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  line-height: 1.6;
}
.book-table th,
.book-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}
.book-table th {
  background: var(--bg-hover);
  color: var(--accent-light);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.book-table tr:last-child td { border-bottom: none; }
.book-table tr:hover td { background: rgba(27,158,119,0.04); }

/* ── Figures ────────────────────────────────────────────────────────── */
.book-figure {
  margin: 2.5em auto;
  text-align: center;
}
.book-figure img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: #fff;
  padding: 12px;
  transition: transform 0.3s, box-shadow 0.3s;
}
.book-figure img:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.book-figure figcaption {
  margin-top: 10px;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ── Math Blocks ────────────────────────────────────────────────────── */
.math-block {
  display: block;
  margin: 1.5em 0;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  overflow-x: auto;
  white-space: pre-wrap;
  color: var(--cb2-gold);
  text-align: center;
  position: relative;
}
.math-block::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cb2-gold), var(--cb-purple));
  border-radius: 12px 12px 0 0;
}

/* ── Epistemic Tags (inline) ────────────────────────────────────────── */
.chapter-content strong {
  color: var(--accent-light);
}

/* ── Book Index Page ────────────────────────────────────────────────── */
.book-index {
  min-height: 100vh;
  padding-top: 60px;
}

.book-main-title {
  font-size: clamp(2.5rem, 6vw, 3.6rem);
  font-weight: 700;
  background: linear-gradient(135deg, #e8ecf0, var(--cb2-teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  margin-top: 0.5em;
  margin-bottom: 0.15em;
}

.book-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 300;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 1.5em;
  font-style: italic;
  font-family: 'Crimson Pro', serif;
}

.book-author {
  text-align: center;
  font-family: 'Crimson Pro', serif;
  font-size: 1.15rem;
  color: var(--text-primary);
  margin-bottom: 0.3em;
}
.author-affiliation {
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.book-date {
  text-align: center;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 3em;
}

/* ── TOC Grid — mirrors the parts-accordion pattern ─────────────────── */
.toc-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 850px;
  margin: 0 auto;
}

.toc-part {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s;
}
.toc-part:hover { border-color: var(--border-medium); }

.toc-part h3 {
  font-family: 'Crimson Pro', serif;
  font-size: 1.15rem;
  font-weight: 600;
  padding: 18px 24px;
  margin: 0;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-subtle);
}
.toc-part h3 a { color: var(--accent-light); }
.toc-part h3 a:hover { color: var(--cb2-gold); }

/* Part label tag (uses same badge pattern as theorems) */
.toc-part h3::before {
  display: none;  /* override if we add part numbers */
}

.toc-chapters {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc-chapters li {
  border-bottom: 1px solid rgba(102,194,165,0.08);
}
.toc-chapters li:last-child { border-bottom: none; }

.toc-chapters a {
  display: flex;
  align-items: center;
  padding: 14px 24px;
  color: var(--text-secondary);
  font-family: 'Crimson Pro', serif;
  font-size: 1.05rem;
  transition: all 0.25s;
}
.toc-chapters a:hover {
  color: var(--accent-light);
  background: rgba(27,158,119,0.05);
  padding-left: 30px;
}

/* Chapter number prefix (injected via counter) */
.toc-chapters {
  counter-reset: chapter-counter;
}
.toc-chapters li {
  counter-increment: chapter-counter;
}

/* ── Footer ─────────────────────────────────────────────────────────── */
.book-footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}
.book-footer p {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  color: var(--text-muted);
}
.book-footer .footer-note {
  font-family: 'Crimson Pro', serif;
  font-style: italic;
  color: var(--accent-light);
  font-size: 16px;
  margin-top: 8px;
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .chapter-container {
    padding-top: 24px;
    padding-bottom: 32px;
  }
  .chapter-toc ol { columns: 1; }
  .nav-prev, .nav-next {
    max-width: 38%;
    font-size: 0.8rem;
  }
  .toc-chapters a { padding: 12px 16px; }
  .toc-part h3 { padding: 14px 16px; }
}

@media (max-width: 500px) {
  .chapter-content { font-size: 1rem; }
  h1.chapter-title { font-size: 1.6rem; }
}

/* ── Print ──────────────────────────────────────────────────────────── */
@media print {
  #main-nav,
  .chapter-nav-top,
  .chapter-nav-bottom,
  .chapter-toc,
  .book-footer { display: none; }

  .chapter-container { max-width: 100%; padding: 0; }
  .chapter-content { font-size: 11pt; color: #000; line-height: 1.6; }

  h1.chapter-title {
    font-size: 22pt;
    -webkit-text-fill-color: #000;
    color: #000;
    border-color: #000;
  }
  h2.section-heading { font-size: 16pt; color: #333; }
  h3.subsection-heading { font-size: 13pt; color: #333; }

  .book-table th, .book-table td { border: 1px solid #ccc; }
  .book-figure img { border: 1px solid #999; padding: 4px; }
  .math-block { border: 1px solid #999; color: #333; }
  .math-block::before { display: none; }
}


/* Display equations */
p.display-math { text-align: center; margin: 1.2em 0; font-size: 1.1em; }
p.display-math em.math { font-style: italic; font-family: "Cambria Math", "STIX Two Math", serif; }

/* Breadcrumb navigation */
.breadcrumb {
  padding: 0.75rem 0;
  margin-bottom: 0.5rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  color: #8fa4b8;
  border-bottom: 1px solid rgba(143, 164, 184, 0.15);
}
.breadcrumb a {
  color: #5b9bd5;
  text-decoration: none;
}
.breadcrumb a:hover {
  text-decoration: underline;
}
.breadcrumb-sep {
  margin: 0 0.5rem;
  color: #4a6275;
}
.breadcrumb-current {
  color: #c8d6e0;
}

/* ── KaTeX Math Overflow Fix ──────────────────────────────────────── */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding: 0.5em 0;
}
.katex-display > .katex {
  max-width: 100%;
}
.katex {
  font-size: 1.1em;
}
p.display-math,
.math-block {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding: 0.5em 0;
}