/* ============================================================
   EPP – Unified Textbook Stylesheet
   Clean academic formatting with modern touches
   Adapted from Structure stylesheet
   ============================================================ */

:root {
  --base: 12pt;
  --font: 'Times New Roman', Times, serif;
  --ink: #111;
  --muted: #666;
  --line: #e5e7eb;
  --soft: #f8f9fa;
  --page-w: 820px;
  --ease: cubic-bezier(.4,0,.2,1);
  --accent: #4f46e5;
  --accent-soft: rgba(79,70,229,.06);
  --accent-glow: rgba(79,70,229,.12);
  --radius: 12px;
  --radius-sm: 8px;
}

/* ── Dark Mode ── */
[data-theme="dark"] {
  --ink: #e0ddd5;
  --muted: #9ca3af;
  --line: #2a2d35;
  --soft: #1a1d24;
  --accent: #818cf8;
  --accent-soft: rgba(129,140,248,.08);
  --accent-glow: rgba(129,140,248,.15);
}
[data-theme="dark"] body {
  background: #0f1015 !important;
  color: var(--ink);
}
[data-theme="dark"] h1, [data-theme="dark"] h2 {
  border-color: #333;
}
[data-theme="dark"] th {
  background: #1f2128;
  color: #e0ddd5;
}
[data-theme="dark"] td {
  background: transparent;
}
[data-theme="dark"] table {
  border-color: var(--line);
}
[data-theme="dark"] th, [data-theme="dark"] td {
  border-color: var(--line);
}
[data-theme="dark"] .exam-note {
  border-color: var(--line);
  background: var(--soft);
}
[data-theme="dark"] .callout {
  border-color: var(--accent);
  background: var(--accent-soft);
}
[data-theme="dark"] .figure-container {
  border-color: var(--line);
}
[data-theme="dark"] pre, [data-theme="dark"] code {
  background: var(--soft);
}
[data-theme="dark"] .print-btn {
  background: rgba(20,20,30,.8);
  color: var(--ink);
  border-color: var(--line);
}
/* ── Dark Mode SVG Overrides ── */

/* Text: default (no fill attr or black) → light */
[data-theme="dark"] svg text:not([fill]) {
  fill: var(--ink);
}
/* Colored text → brighter variants */
[data-theme="dark"] svg text[fill="#4f46e5"] { fill: #a5b4fc; }
[data-theme="dark"] svg text[fill="#16a34a"] { fill: #4ade80; }
[data-theme="dark"] svg text[fill="#dc2626"] { fill: #fca5a5; }
[data-theme="dark"] svg text[fill="#d97706"] { fill: #fcd34d; }
[data-theme="dark"] svg text[fill="#a855f7"] { fill: #d8b4fe; }
[data-theme="dark"] svg text[fill="#6b7280"] { fill: #d1d5db; }
[data-theme="dark"] svg text[fill="#666"]    { fill: #9ca3af; }
[data-theme="dark"] svg text[fill="#888"]    { fill: #d1d5db; }
/* White text stays white */

/* Light background fills → dark translucent */
[data-theme="dark"] svg rect[fill="#eef2ff"],
[data-theme="dark"] svg circle[fill="#eef2ff"] {
  fill: rgba(129,140,248,.14);
}
[data-theme="dark"] svg rect[fill="#f0fdf4"],
[data-theme="dark"] svg circle[fill="#f0fdf4"] {
  fill: rgba(74,222,128,.12);
}
[data-theme="dark"] svg rect[fill="#fef2f2"],
[data-theme="dark"] svg circle[fill="#fef2f2"] {
  fill: rgba(248,113,113,.10);
}
[data-theme="dark"] svg rect[fill="#fffbeb"],
[data-theme="dark"] svg circle[fill="#fffbeb"] {
  fill: rgba(251,191,36,.10);
}
[data-theme="dark"] svg rect[fill="#fdf4ff"],
[data-theme="dark"] svg circle[fill="#fdf4ff"] {
  fill: rgba(192,132,252,.10);
}
[data-theme="dark"] svg rect[fill="#f8f9fa"],
[data-theme="dark"] svg circle[fill="#f8f9fa"] {
  fill: rgba(156,163,175,.10);
}

/* Strokes → brighter in dark mode */
[data-theme="dark"] svg rect[stroke="#4f46e5"],
[data-theme="dark"] svg ellipse[stroke="#4f46e5"],
[data-theme="dark"] svg circle[stroke="#4f46e5"],
[data-theme="dark"] svg line[stroke="#4f46e5"],
[data-theme="dark"] svg path[stroke="#4f46e5"] {
  stroke: #818cf8;
}
[data-theme="dark"] svg rect[stroke="#16a34a"],
[data-theme="dark"] svg circle[stroke="#16a34a"],
[data-theme="dark"] svg line[stroke="#16a34a"] {
  stroke: #4ade80;
}
[data-theme="dark"] svg rect[stroke="#dc2626"],
[data-theme="dark"] svg circle[stroke="#dc2626"] {
  stroke: #f87171;
}
[data-theme="dark"] svg rect[stroke="#d97706"],
[data-theme="dark"] svg path[stroke="#d97706"] {
  stroke: #fbbf24;
}
[data-theme="dark"] svg rect[stroke="#a855f7"] {
  stroke: #c084fc;
}
[data-theme="dark"] svg rect[stroke="#6b7280"] {
  stroke: #9ca3af;
}

/* Solid accent fills → brighter */
[data-theme="dark"] svg rect[fill="#4f46e5"],
[data-theme="dark"] svg ellipse[fill="#4f46e5"],
[data-theme="dark"] svg circle[fill="#4f46e5"] {
  fill: #6366f1;
}
[data-theme="dark"] svg rect[fill="#16a34a"],
[data-theme="dark"] svg circle[fill="#16a34a"] {
  fill: #22c55e;
}
[data-theme="dark"] svg rect[fill="#dc2626"],
[data-theme="dark"] svg circle[fill="#dc2626"] {
  fill: #ef4444;
}
[data-theme="dark"] svg rect[fill="#d97706"] {
  fill: #f59e0b;
}
[data-theme="dark"] svg rect[fill="#9ca3af"] {
  fill: #6b7280;
}

/* Marker / arrow fills */
[data-theme="dark"] svg polygon[fill="#4f46e5"] { fill: #818cf8; }
[data-theme="dark"] svg polygon[fill="#16a34a"] { fill: #4ade80; }

/* Grid & axis lines */
[data-theme="dark"] svg line[stroke="#e5e7eb"] { stroke: #374151; }
[data-theme="dark"] svg line[stroke="#666"]    { stroke: #4b5563; }
[data-theme="dark"] svg circle[stroke="#4f46e5"][stroke-dasharray] {
  stroke: #818cf8;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

/* ── Body ── */
body {
  font-family: 'Times New Roman', Times, serif;
  font-size: var(--base);
  color: var(--ink);
  background: #fafafa;
  line-height: 1.7;
  max-width: var(--page-w);
  margin: 0 auto;
  padding: 2rem 2.5rem 4rem;
  -webkit-font-smoothing: antialiased;
  transition: background .3s var(--ease), color .3s var(--ease);
}

/* ── Topbar Nav ── */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9990;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  font-family: 'Times New Roman', Times, serif;
  font-size: 13px;
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(0,0,0,.06);
  transition: background .3s, border-color .3s;
}
.topbar a {
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  transition: all .2s var(--ease);
  font-weight: 600;
}
.topbar a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}
.topbar span {
  color: var(--muted);
  font-weight: 400;
}
[data-theme="dark"] .topbar {
  background: rgba(15,16,21,.78);
  border-color: rgba(255,255,255,.05);
}
body:has(.topbar) {
  padding-top: calc(2rem + 44px);
}

/* ── Chapter Header ── */
.ch-header {
  text-align: center;
  padding: 2.5rem 0 2rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--line);
  animation: ch-fade-in .6s var(--ease) both;
}
@keyframes ch-fade-in {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
.ch-header h1 {
  font-size: 18pt;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.6rem;
  padding-bottom: 0;
  border-bottom: none;
  background: linear-gradient(135deg, var(--ink) 0%, var(--muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
[data-theme="dark"] .ch-header h1 {
  background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  background-clip: text;
}
.ch-header .meta {
  font-family: 'Times New Roman', Times, serif;
  font-size: 11pt;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 0.5rem;
}
.ch-header .author {
  font-family: 'Times New Roman', Times, serif;
  font-size: 10pt;
  color: var(--muted);
  font-weight: 400;
  font-style: italic;
}

/* ── TOC Card ── */
.toc-card {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  margin: 1.5rem 0 2rem;
  animation: ch-fade-in .6s var(--ease) .1s both;
}
.toc-card h3 {
  font-family: 'Times New Roman', Times, serif;
  font-size: 11pt;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}
.toc-grid {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.toc-grid a {
  font-family: 'Times New Roman', Times, serif;
  font-size: 10.5pt;
  color: var(--ink);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all .2s var(--ease);
  display: block;
}
.toc-grid a:hover {
  background: var(--accent-soft);
  color: var(--accent);
  padding-left: 18px;
}
[data-theme="dark"] .toc-card {
  background: var(--soft);
  border-color: var(--line);
}

/* ── Content wrapper ── */
.content {
  animation: ch-fade-in .6s var(--ease) .2s both;
}

/* ── Headings ── */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Times New Roman', Times, serif;
  color: var(--ink);
  line-height: 1.3;
}

h1 {
  font-size: 16pt;
  font-weight: 800;
  text-transform: uppercase;
  text-align: center;
  margin: 0 0 1.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--line);
  letter-spacing: 0.03em;
}

h2 {
  font-size: 13pt;
  font-weight: 700;
  text-transform: uppercase;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--line);
  letter-spacing: 0.02em;
  position: relative;
}
h2::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

h3 {
  font-size: 12pt;
  font-weight: 700;
  margin: 1.8rem 0 0.6rem;
  padding-left: 0.8rem;
  border-left: 3px solid var(--accent);
}

h4 {
  font-size: 12pt;
  font-weight: 700;
  font-style: italic;
  margin: 1.2rem 0 0.5rem;
}

h5 {
  font-size: 11pt;
  font-weight: 600;
  margin: 1rem 0 0.4rem;
}

/* ── Body text ── */
p {
  font-size: var(--base);
  text-align: justify;
  margin: 0 0 1rem;
  hyphens: auto;
}

p + p {
  text-indent: 1.5em;
}

/* ── Lists ── */
ul, ol {
  margin: 0.5rem 0 1rem;
  padding-left: 2rem;
}

li {
  font-size: var(--base);
  text-align: justify;
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

ul > li { list-style-type: disc; }
ul > li > ul > li { list-style-type: circle; }

/* ── Exam note boxes ── */
.exam-note {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 1.2rem 1.4rem;
  margin: 1.5rem 0;
  background: var(--accent-soft);
  break-inside: avoid;
  transition: border-color .2s var(--ease);
}

.exam-note h4 {
  margin-top: 0;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 0.3rem;
  color: var(--accent);
  font-family: 'Times New Roman', Times, serif;
  font-size: 10.5pt;
}

/* ── Callout boxes ── */
.callout {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.2rem 1rem 1.4rem;
  margin: 1.5rem 0;
  font-style: italic;
  background: var(--soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ── Blockquote ── */
blockquote {
  border-left: 3px solid var(--line);
  padding: 1rem 1.2rem 1rem 1.4rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--soft);
}

/* ── Tables ── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: var(--base);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line);
}

th, td {
  border: 1px solid var(--line);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  font-size: var(--base);
}

th {
  font-weight: 700;
  background: var(--soft);
  text-transform: uppercase;
  font-size: 10.5pt;
  font-family: 'Times New Roman', Times, serif;
  letter-spacing: 0.04em;
  color: var(--muted);
}

caption {
  caption-side: bottom;
  font-style: italic;
  color: var(--muted);
  font-size: 10pt;
  padding-top: 0.4rem;
}

/* ── Figures ── */
.figure-container, figure {
  text-align: center;
  margin: 2rem 0;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--soft);
  break-inside: avoid;
  transition: border-color .2s var(--ease);
}
.figure-container:hover, figure:hover {
  border-color: var(--accent-glow);
}

.figcaption, figcaption {
  font-style: italic;
  margin-top: 0.5rem;
  text-align: center;
  font-size: 10pt;
  color: var(--muted);
}

/* ── Example / Question Card ── */
.example {
  margin: 2.5rem 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  break-inside: avoid;
  background: var(--bg, #fff);
}
[data-theme="dark"] .example {
  background: var(--soft);
  border-color: var(--line);
}
.ex-title {
  font-family: 'Times New Roman', Times, serif;
  font-size: 10.5pt;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.6rem 1.4rem;
  border-bottom: 1px solid var(--line);
  letter-spacing: 0.02em;
}
.ex-q {
  padding: 1rem 1.4rem;
  font-size: var(--base);
  line-height: 1.8;
  text-align: justify;
}

/* ── Definition Box ── */
.def-box {
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1.2rem 1.4rem;
  margin: 1.5rem 0;
  background: var(--soft);
  break-inside: avoid;
}
.def-box .dt {
  font-family: 'Times New Roman', Times, serif;
  font-size: 11pt;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--line);
}
[data-theme="dark"] .def-box {
  background: var(--soft);
  border-color: var(--line);
  border-left-color: var(--accent);
}

/* ── Note Box ── */
.note {
  border: 1px solid var(--line);
  border-left: 3px solid #d97706;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 0.8rem 1.2rem;
  margin: 1rem 0;
  background: rgba(217,119,6,.04);
  font-size: 11pt;
  line-height: 1.6;
}
[data-theme="dark"] .note {
  background: rgba(217,119,6,.06);
  border-color: var(--line);
  border-left-color: #f59e0b;
}

/* ── Result / Answer Box ── */
.result-box {
  text-align: center;
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  background: linear-gradient(135deg, rgba(16,185,129,.05) 0%, rgba(5,150,105,.08) 100%);
  border: 1px solid rgba(16,185,129,.2);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}
[data-theme="dark"] .result-box {
  background: rgba(16,185,129,.06);
  border-color: rgba(16,185,129,.15);
}

/* ── Solution Label ── */
.soln-label {
  display: inline-block;
  font-family: 'Times New Roman', Times, serif;
  font-size: 10pt;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #fff;
  background: var(--accent);
  padding: 4px 16px;
  border-radius: 4px;
  margin: 1.5rem 0 1rem;
}

/* ── Visual Grid ── */
.visual-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 1.5rem 0;
}
.visual-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  background: var(--soft);
  break-inside: avoid;
}
[data-theme="dark"] .visual-card {
  background: var(--soft);
  border-color: var(--line);
}

/* ── Quick Reference Card ── */
.quick-ref {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  margin: 1.5rem 0;
  background: var(--soft);
  break-inside: avoid;
}

/* ── Question Index ── */
.qi-container {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0 2rem;
}
.qi-container h2,
.qi-container h3 {
  font-family: 'Times New Roman', Times, serif;
  font-size: 11pt;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.qi-container h2::after {
  display: none;
}
.qi-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.qi-item {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px dotted var(--line);
  text-decoration: none;
  color: var(--ink);
  border-radius: var(--radius-sm);
  transition: all .15s var(--ease);
}
.qi-item:last-child {
  border-bottom: none;
}
.qi-item:hover {
  background: var(--accent-soft);
  color: var(--accent);
}
.qi-num {
  font-weight: 700;
  min-width: 2.5rem;
  flex-shrink: 0;
  color: var(--accent);
}
.qi-title {
  flex: 1;
}
.qi-meta {
  font-family: 'Times New Roman', Times, serif;
  font-size: 9pt;
  color: var(--muted);
  font-style: italic;
  white-space: nowrap;
  background: var(--soft);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ── Print button ── */
.print-btn {
  position: fixed;
  top: 12px;
  right: 68px;
  border: 1px solid rgba(0,0,0,.08);
  background: rgba(255,255,255,.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--ink);
  padding: 8px 16px;
  font-weight: 600;
  cursor: pointer;
  font-family: 'Times New Roman', Times, serif;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  z-index: 9995;
  transition: all .25s var(--ease);
}

.print-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(79,70,229,.25);
}

/* ── Links ── */
a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
  transition: color .2s var(--ease);
}

a:hover {
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
}

/* ── Horizontal rule ── */
hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

/* ── Strong / emphasis ── */
strong, b { font-weight: 700; }
em, i { font-style: italic; }

/* ── Back to Top ── */
.btt {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'Times New Roman', Times, serif;
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-glow);
  margin: 1.5rem 0;
  transition: all .2s var(--ease);
}
.btt:hover {
  background: var(--accent-soft);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ── Print styles ── */
@media print {
  body {
    padding: 0;
    max-width: 100%;
    background: white;
    color: black;
  }
  .print-btn, .cm-dm-toggle, .cm-nav-bar, .topbar,
  .dw-btn, .dw-tb, .dw-cv, .cm-scroll-progress, .cm-scroll-top {
    display: none !important;
  }
  h1, h2, h3 { page-break-after: avoid; }
  .figure-container, figure, .exam-note, .callout, table {
    page-break-inside: avoid;
  }
  h2::after { display: none; }
}

/* ── Responsive ── */
@media (max-width: 600px) {
  body {
    padding: 1rem;
    font-size: 11pt;
  }
  h1 { font-size: 14pt; }
  h2 { font-size: 12pt; }
  .topbar { padding: 8px 12px; font-size: 12px; }
  .toc-card { padding: 1rem; }
  .ch-header { padding: 1.5rem 0 1rem; }
}

/* ── Year-Asked Tags ── */
.year-tag {
  display: inline-block;
  font-family: 'Times New Roman', Times, serif;
  font-size: 8.5pt;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  padding: 1px 8px;
  border-radius: 3px;
  margin-left: 6px;
  vertical-align: middle;
  letter-spacing: 0.02em;
  white-space: nowrap;
  line-height: 1.6;
}
.year-tag + .year-tag {
  margin-left: 3px;
}
[data-theme="dark"] .year-tag {
  background: var(--accent);
  color: #fff;
}

/* ── SVG Wrapper ── */
.svg-wrap {
  text-align: center;
  margin: 2rem 0;
  padding: 1.2rem;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
  break-inside: avoid;
}
.svg-wrap svg, .figure-container svg {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}
/* SVG text font sizes – compact */
.svg-wrap svg text, .figure-container svg text {
  font-size: 9pt;
}
.svg-wrap svg text[font-weight="bold"], .figure-container svg text[font-weight="bold"] {
  font-size: 10pt;
  font-weight: bold;
}
[data-theme="dark"] .svg-wrap {
  background: var(--soft);
  border-color: var(--line);
}

/* ── Chapter Navigation Bar ── */
.ch-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  margin: 0 -2.5rem 1rem;
  background: var(--soft);
  border-bottom: 1px solid var(--line);
  font-family: 'Times New Roman', Times, serif;
  font-size: 11pt;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.ch-nav a {
  text-decoration: none;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 10pt;
  transition: all .2s var(--ease);
  white-space: nowrap;
}
.ch-nav a:hover {
  background: var(--accent-soft);
  text-decoration: none;
}
.ch-nav .nav-title {
  color: var(--muted);
  font-weight: 400;
  font-size: 10pt;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  text-align: center;
}
.ch-nav .nav-disabled {
  color: var(--line);
  pointer-events: none;
}
[data-theme="dark"] .ch-nav {
  background: rgba(15,16,21,.85);
  border-color: var(--line);
}
@media (max-width: 600px) {
  .ch-nav { margin: 0 -1rem 1rem; padding: 8px 10px; }
  .ch-nav .nav-title { display: none; }
  .ch-nav a { font-size: 9pt; padding: 4px 8px; }
}
@media print {
  .ch-nav { display: none !important; }
}

/* ── Inline Icons ── */
.icon-pin {
  display: inline-block;
  width: 14px;
  height: 14px;
  vertical-align: middle;
  margin-right: 3px;
  background: currentColor;
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='12' y1='17' x2='12' y2='22'/%3E%3Cpath d='M5 17h14v-1.76a2 2 0 0 0-1.11-1.79l-1.78-.9A2 2 0 0 1 15 10.76V6h1a2 2 0 0 0 0-4H8a2 2 0 0 0 0 4h1v4.76a2 2 0 0 1-1.11 1.79l-1.78.9A2 2 0 0 0 5 15.24z'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='12' y1='17' x2='12' y2='22'/%3E%3Cpath d='M5 17h14v-1.76a2 2 0 0 0-1.11-1.79l-1.78-.9A2 2 0 0 1 15 10.76V6h1a2 2 0 0 0 0-4H8a2 2 0 0 0 0 4h1v4.76a2 2 0 0 1-1.11 1.79l-1.78.9A2 2 0 0 0 5 15.24z'/%3E%3C/svg%3E");
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}

/* ── Mnemonics Holder ── */
.mnemonics-panel {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 9000;
}
.mnemonics-toggle {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--accent);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(79,70,229,.3);
  transition: all .25s var(--ease);
}
.mnemonics-toggle::before {
  content: '';
  display: block;
  width: 22px;
  height: 22px;
  background: #fff;
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3Cpolyline points='10 9 9 9 8 9'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3Cpolyline points='10 9 9 9 8 9'/%3E%3C/svg%3E");
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}
.mnemonics-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(79,70,229,.4);
}
.mnemonics-drawer {
  display: none;
  position: fixed;
  bottom: 80px;
  right: 20px;
  width: 360px;
  max-height: 70vh;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,.12);
  flex-direction: column;
  overflow: hidden;
  z-index: 9001;
}
.mnemonics-drawer.open {
  display: flex;
}
.mnemonics-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--soft);
  font-family: 'Times New Roman', Times, serif;
}
.mnemonics-drawer-header h4 {
  margin: 0;
  font-size: 11pt;
  font-weight: 700;
  color: var(--accent);
  font-style: normal;
  display: flex;
  align-items: center;
  gap: 6px;
}
.mnemonics-drawer-header h4::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  background: var(--accent);
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3Cpolyline points='10 9 9 9 8 9'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3Cpolyline points='10 9 9 9 8 9'/%3E%3C/svg%3E");
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}
.mnemonics-drawer-header button {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  color: var(--muted);
  padding: 2px 6px;
  border-radius: 4px;
}
.mnemonics-drawer-header button:hover {
  background: var(--accent-soft);
  color: var(--accent);
}
.mnemonics-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
}
.mnemonics-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.mnemonics-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px dotted var(--line);
  font-size: 10.5pt;
  font-family: 'Times New Roman', Times, serif;
  line-height: 1.5;
  text-align: left;
  margin: 0;
}
.mnemonics-list li:last-child {
  border-bottom: none;
}
.mnemonics-list .mn-text {
  flex: 1;
  white-space: pre-wrap;
  word-break: break-word;
}
.mnemonics-list .mn-del {
  background: none;
  border: none;
  color: #dc2626;
  cursor: pointer;
  font-size: 14px;
  padding: 2px 4px;
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 1px;
}
.mnemonics-list .mn-del:hover {
  background: #fef2f2;
}
.mnemonics-empty {
  color: var(--muted);
  font-style: italic;
  font-size: 10pt;
  text-align: center;
  padding: 20px 0;
}
.mnemonics-add {
  display: flex;
  gap: 6px;
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  background: var(--soft);
}
.mnemonics-add input {
  flex: 1;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-family: 'Times New Roman', Times, serif;
  font-size: 10.5pt;
  background: #fff;
  color: var(--ink);
  outline: none;
  transition: border-color .2s;
}
.mnemonics-add input:focus {
  border-color: var(--accent);
}
.mnemonics-add button {
  padding: 7px 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-family: 'Times New Roman', Times, serif;
  font-size: 10pt;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
}
.mnemonics-add button:hover {
  background: #4338ca;
}
[data-theme="dark"] .mnemonics-drawer {
  background: #1a1d24;
  border-color: var(--line);
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
}
[data-theme="dark"] .mnemonics-add input {
  background: #0f1015;
  border-color: var(--line);
  color: var(--ink);
}
[data-theme="dark"] .mnemonics-list .mn-del:hover {
  background: rgba(220,38,38,.15);
}
@media (max-width: 600px) {
  .mnemonics-drawer { width: calc(100vw - 32px); right: 16px; bottom: 76px; }
  .mnemonics-panel { bottom: 16px; right: 16px; }
}
@media print {
  .mnemonics-panel, .mnemonics-drawer { display: none !important; }
}