/* ============================================================
   COMPUTING & AI ETHICS — EBOOK STYLESHEET
   ============================================================

   Color-coding system (mirrors the LaTeX lecture preamble):
     Blue   (#1a4a8a)  — Arguments, concepts, neutral info
     Gold   (#c8961c)  — Case studies, discussion questions
     Green  (#2e7d32)  — Key points, learning outcomes, pro-arguments
     Red    (#c62828)  — Objections, counterarguments, warnings
     Purple (#6a1b9a)  — Key thinkers, biographical sidebars
     Gray   (#546e7a)  — Quotes, historical context

   Table of contents
   -----------------
   1.  Reset & base
   2.  CSS custom properties
   3.  Typography
   4.  Layout scaffolding
   5.  Top navigation
   6.  Index page (landing)
   7.  Chapter header
   8.  In-page table of contents
   9.  Body prose
  10.  Special elements
       10a. Central Questions
       10b. Argument boxes
       10c. Key Thinker cards
       10d. Case Studies
       10e. Thought Questions
       10f. Key Points
       10g. Quote blocks
       10h. Definition boxes
       10i. Pro / Objection boxes
  11.  Tables
  12.  Figures & diagrams (Mermaid / SVG)
  13.  Chapter footer
  14.  Responsive
  15.  Print styles
   ============================================================ */


/* ============================================================
   1. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 17px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--blue-mid);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

ul, ol { padding-left: 1.6em; }
li { margin-bottom: 0.35em; }

/* ============================================================
   2. CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  /* Brand palette */
  --blue-dark:       #002855;
  --blue-mid:        #1a4a8a;
  --blue-light:      #dce8f5;
  --blue-xlight:     #f0f6ff;

  --gold-dark:       #7a4a00;
  --gold-mid:        #c8961c;
  --gold-light:      #fdf3d6;
  --gold-xlight:     #fffbf0;

  --green-dark:      #1b5e20;
  --green-mid:       #2e7d32;
  --green-light:     #e8f5e9;
  --green-xlight:    #f4fff4;

  --red-dark:        #7f0000;
  --red-mid:         #c62828;
  --red-light:       #fdecea;
  --red-xlight:      #fff5f5;

  --purple-dark:     #3a0066;
  --purple-mid:      #6a1b9a;
  --purple-light:    #f3e5f5;
  --purple-xlight:   #faf0ff;

  --gray-dark:       #263238;
  --gray-mid:        #546e7a;
  --gray-light:      #eceff1;
  --gray-xlight:     #f8f9fa;

  /* Semantic tokens */
  --color-text:       #1a1a1a;
  --color-text-muted: #5a5a5a;
  --color-bg:         #fafafa;
  --color-surface:    #ffffff;
  --color-border:     #d0d7de;

  /* Chapter accent (overridden per-chapter via <body data-chapter="N">) */
  --chapter-color:    var(--blue-mid);
  --chapter-light:    var(--blue-light);

  /* Typography */
  --font-body:    Georgia, 'Times New Roman', serif;
  --font-ui:      -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
                  'Helvetica Neue', Arial, sans-serif;
  --font-mono:    'Courier New', Courier, monospace;
  --line-height:  1.8;

  /* Layout */
  --content-max:  840px;
  --gap-xs:       0.4rem;
  --gap-sm:       0.75rem;
  --gap-md:       1.25rem;
  --gap-lg:       2rem;
  --gap-xl:       3rem;

  /* Decoration */
  --radius:       6px;
  --radius-lg:    10px;
  --shadow-sm:    0 1px 4px rgba(0,0,0,.10);
  --shadow-md:    0 3px 12px rgba(0,0,0,.14);
  --shadow-lg:    0 6px 24px rgba(0,0,0,.16);
}

/* Per-chapter accent colors (applied via data attribute on <body>) */
body[data-chapter="1"]  { --chapter-color: #003875; --chapter-light: #d8e6f5; }
body[data-chapter="2"]  { --chapter-color: #1a5080; --chapter-light: #d6e8f5; }
body[data-chapter="3"]  { --chapter-color: #1a6040; --chapter-light: #d6f0e4; }
body[data-chapter="4"]  { --chapter-color: #3d1a8a; --chapter-light: #ebe1fa; }
body[data-chapter="5"]  { --chapter-color: #10304a; --chapter-light: #d2e4f0; }
body[data-chapter="6"]  { --chapter-color: #6b1a40; --chapter-light: #f5d8e6; }
body[data-chapter="7"]  { --chapter-color: #4a1a8a; --chapter-light: #ece1f8; }
body[data-chapter="8"]  { --chapter-color: #1a4a3a; --chapter-light: #d6f0e8; }


/* ============================================================
   3. TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-ui);
  font-weight: 700;
  line-height: 1.3;
  color: var(--blue-dark);
}

h1 { font-size: 2.2rem;  margin-bottom: var(--gap-md); }
h2 { font-size: 1.55rem; margin-top: var(--gap-xl); margin-bottom: var(--gap-md);
     border-bottom: 2px solid var(--chapter-color);
     padding-bottom: 0.35em; }
h3 { font-size: 1.25rem; margin-top: var(--gap-lg); margin-bottom: var(--gap-sm);
     color: var(--chapter-color); }
h4 { font-size: 1.05rem; margin-top: var(--gap-md); margin-bottom: var(--gap-xs);
     font-variant: small-caps; letter-spacing: .04em; color: var(--color-text); }

p  { margin-bottom: var(--gap-md); }
p + p { text-indent: 1.5em; margin-top: 0; }

strong { color: var(--blue-dark); }
em     { font-style: italic; }

code, kbd {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--gray-light);
  border-radius: 3px;
  padding: .1em .35em;
}

/* ============================================================
   4. LAYOUT SCAFFOLDING
   ============================================================ */
.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-area {
  flex: 1;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--gap-lg) var(--gap-lg);
}


/* ============================================================
   5. TOP NAVIGATION
   ============================================================ */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--chapter-color);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.5rem;
  box-shadow: var(--shadow-md);
  font-family: var(--font-ui);
  font-size: 0.88rem;
}

.top-nav a           { color: #fff; font-weight: 500; }
.top-nav a:hover     { text-decoration: underline; opacity: 0.9; }

.nav-home {
  font-weight: 700;
  font-size: 0.95rem;
  white-space: nowrap;
}

.chapter-nav {
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}

.nav-prev, .nav-next {
  padding: 0.25rem 0.75rem;
  border: 1px solid rgba(255,255,255,.45);
  border-radius: var(--radius);
  white-space: nowrap;
}
.nav-prev:hover, .nav-next:hover {
  background: rgba(255,255,255,.15);
  text-decoration: none;
}

.nav-chapter { opacity: 0.8; font-variant: small-caps; }


/* ============================================================
   6. INDEX PAGE (landing)
   ============================================================ */

/* Hero */
.index-hero {
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-mid) 100%);
  color: #fff;
  padding: 4rem 2rem 3.5rem;
  text-align: center;
}
.index-hero h1 {
  color: #fff;
  font-size: 2.6rem;
  margin-bottom: 0.5rem;
  border: none;
}
.index-hero .subtitle {
  font-size: 1.15rem;
  opacity: 0.85;
  margin-bottom: 0.35rem;
  font-family: var(--font-ui);
}
.index-hero .author-line {
  font-size: 1rem;
  opacity: 0.75;
  font-family: var(--font-ui);
  margin-bottom: 1.2rem;
}
.license-badge {
  display: inline-block;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.4);
  border-radius: 20px;
  padding: .3rem .9rem;
  font-size: .8rem;
  font-family: var(--font-ui);
}

/* Intro text */
.index-intro {
  max-width: var(--content-max);
  margin: var(--gap-xl) auto;
  padding: 0 var(--gap-lg);
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

/* Chapter grid */
.chapters-section {
  max-width: calc(var(--content-max) + 160px);
  margin: 0 auto var(--gap-xl);
  padding: 0 var(--gap-lg);
}
.chapters-section h2 {
  font-family: var(--font-ui);
  font-size: 1.3rem;
  color: var(--gray-dark);
  border: none;
  margin-bottom: var(--gap-lg);
  text-transform: uppercase;
  letter-spacing: .08em;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.4rem;
}

.chapter-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: box-shadow .2s, transform .2s;
  display: flex;
  flex-direction: column;
}
.chapter-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  background: var(--card-accent, var(--blue-mid));
  color: #fff;
  padding: 1rem 1.25rem 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.9rem;
}
.card-num {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  opacity: 0.85;
  white-space: nowrap;
}
.card-title {
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
}

.card-body {
  padding: 1rem 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}
.card-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
  margin: 0;
  text-indent: 0;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--card-accent, var(--blue-mid));
  margin-top: var(--gap-xs);
}
.card-link::after { content: " →"; }
.card-link:hover { text-decoration: underline; }

/* Chapter-specific card accent colors */
.chapter-card[data-ch="1"] { --card-accent: #003875; }
.chapter-card[data-ch="2"] { --card-accent: #1a5080; }
.chapter-card[data-ch="3"] { --card-accent: #1a6040; }
.chapter-card[data-ch="4"] { --card-accent: #3d1a8a; }
.chapter-card[data-ch="5"] { --card-accent: #10304a; }
.chapter-card[data-ch="6"] { --card-accent: #6b1a40; }
.chapter-card[data-ch="7"] { --card-accent: #4a1a8a; }
.chapter-card[data-ch="8"] { --card-accent: #1a4a3a; }

/* Index footer */
.index-footer {
  background: var(--gray-dark);
  color: #ccc;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  font-family: var(--font-ui);
}
.index-footer a { color: #adc6e8; }


/* ============================================================
   7. CHAPTER HEADER
   ============================================================ */
.chapter-header {
  background: linear-gradient(135deg, var(--chapter-color) 0%,
              color-mix(in srgb, var(--chapter-color) 75%, #000) 100%);
  color: #fff;
  padding: 3rem var(--gap-lg) 2.5rem;
  text-align: center;
}

.chapter-eyebrow {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  opacity: 0.75;
  margin-bottom: 0.6rem;
}

.chapter-header h1 {
  color: #fff;
  font-size: 2.1rem;
  margin-bottom: 0.6rem;
  border: none;
}

.chapter-header .chapter-subtitle {
  font-size: 1.1rem;
  opacity: 0.8;
  font-family: var(--font-ui);
  font-style: italic;
  margin: 0;
}


/* ============================================================
   8. IN-PAGE TABLE OF CONTENTS
   ============================================================ */
.toc-box {
  background: var(--blue-xlight);
  border: 1px solid var(--blue-light);
  border-left: 4px solid var(--chapter-color);
  border-radius: var(--radius);
  padding: var(--gap-md) var(--gap-lg);
  margin: var(--gap-lg) 0;
  font-family: var(--font-ui);
  font-size: 0.9rem;
}

.toc-box h2 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--chapter-color);
  margin: 0 0 0.75rem;
  border: none;
  padding: 0;
}

.toc-box ol {
  padding-left: 1.4em;
  margin: 0;
  color: var(--blue-mid);
}
.toc-box li { margin-bottom: 0.25em; }
.toc-box a  { color: var(--blue-mid); font-weight: 500; }
.toc-box a:hover { text-decoration: underline; }


/* ============================================================
   9. BODY PROSE
   ============================================================ */
.chapter-content {
  padding-top: var(--gap-lg);
  padding-bottom: var(--gap-xl);
}

.chapter-content section + section { margin-top: var(--gap-xl); }

/* Scroll offset for sticky nav */
.chapter-content h2,
.chapter-content h3 {
  scroll-margin-top: 4rem;
}


/* ============================================================
   10. SPECIAL ELEMENTS
   ============================================================ */

/* ---- 10a. CENTRAL QUESTIONS -------------------------------- */
.central-questions {
  background: var(--green-xlight);
  border: 1px solid #b2dfb3;
  border-left: 5px solid var(--green-mid);
  border-radius: var(--radius-lg);
  padding: var(--gap-lg);
  margin: var(--gap-lg) 0;
}

.central-questions h2,
.central-questions h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--green-dark);
  border: none;
  margin: 0 0 var(--gap-md);
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.central-questions h2::before,
.central-questions h3::before {
  content: "★";
  font-size: 1rem;
}

.central-questions ol {
  margin: 0;
  padding-left: 1.5em;
  color: var(--color-text);
}
.central-questions li {
  font-size: 1rem;
  font-style: italic;
  margin-bottom: 0.5em;
}
.central-questions li strong { color: var(--green-dark); font-style: normal; }


/* ---- 10b. ARGUMENT BOXES ----------------------------------- */
.argument-box {
  background: var(--blue-xlight);
  border: 1px solid var(--blue-light);
  border-left: 5px solid var(--blue-mid);
  border-radius: var(--radius-lg);
  padding: var(--gap-lg);
  margin: var(--gap-lg) 0;
}

.argument-box .box-label {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--blue-mid);
  margin-bottom: var(--gap-sm);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.argument-box .box-label::before { content: "▶"; font-size: 0.7rem; }

.argument-box .box-title {
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--blue-dark);
  margin-bottom: var(--gap-md);
}

.argument-box ol.premises {
  padding-left: 1.6em;
  margin-bottom: var(--gap-md);
}
.argument-box ol.premises li {
  margin-bottom: 0.45em;
  font-size: 0.97rem;
}

.argument-box .conclusion {
  border-top: 2px solid var(--blue-light);
  padding-top: var(--gap-sm);
  font-weight: 700;
  color: var(--blue-dark);
  font-size: 0.97rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.argument-box .conclusion .therefore {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--blue-mid);
  flex-shrink: 0;
}


/* ---- 10c. KEY THINKER CARDS -------------------------------- */
.key-thinker {
  background: var(--purple-xlight);
  border: 1px solid #d8b4f0;
  border-left: 5px solid var(--purple-mid);
  border-radius: var(--radius-lg);
  padding: var(--gap-lg);
  margin: var(--gap-lg) 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--gap-md) var(--gap-lg);
}

.thinker-portrait {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--purple-mid);
  grid-row: 1 / 3;
  align-self: start;
}

.thinker-portrait-placeholder {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--purple-mid), var(--purple-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  color: rgba(255,255,255,.7);
  grid-row: 1 / 3;
  align-self: start;
  flex-shrink: 0;
}

.thinker-header {
  align-self: end;
}

.thinker-label {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--purple-mid);
  margin-bottom: 0.3rem;
}

.thinker-name {
  font-family: var(--font-ui);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--purple-dark);
  margin: 0;
}

.thinker-dates {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  color: var(--purple-mid);
  margin-left: 0.4rem;
}

.thinker-body {
  grid-column: 2;
  font-size: 0.95rem;
  line-height: 1.7;
}
.thinker-body p { margin-bottom: 0.6em; text-indent: 0; }
.thinker-body p:last-child { margin-bottom: 0; }

/* When no portrait image (single column) */
.key-thinker.no-portrait {
  grid-template-columns: 1fr;
}
.key-thinker.no-portrait .thinker-header,
.key-thinker.no-portrait .thinker-body {
  grid-column: 1;
}

/* ---- Rectangular portrait variant (.thinker-img-wrap + .thinker-bio) ----
   Used when a full image with caption is preferable to a small circle.       */
.thinker-img-wrap {
  width: 160px;
  flex-shrink: 0;
  grid-row: 1 / -1;          /* span all rows so bio can scroll beside it   */
  align-self: start;
}
.thinker-img-wrap img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  border: 2px solid var(--purple-mid);
}
.thinker-img-wrap .img-caption {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.4rem;
  text-align: center;
}

/* Bio column used alongside .thinker-img-wrap */
.thinker-bio::before {
  content: "Key Thinker";
  display: block;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--purple-mid);
  margin-bottom: 0.25rem;
}
.thinker-bio h3 {
  font-family: var(--font-ui);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--purple-dark);
  margin: 0 0 0.5em 0;
}
.thinker-bio p {
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 0.6em;
  text-indent: 0;
}
.thinker-bio p:last-child { margin-bottom: 0; }

/* no-portrait variant with only .thinker-bio (no image) */
.key-thinker.no-portrait .thinker-bio {
  grid-column: 1;
}


/* ---- 10d. CASE STUDIES ------------------------------------- */
.case-study {
  background: var(--gold-xlight);
  border: 1px solid #f0d590;
  border-left: 5px solid var(--gold-mid);
  border-radius: var(--radius-lg);
  padding: var(--gap-lg);
  margin: var(--gap-lg) 0;
}

.case-study .box-label {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--gold-dark);
  margin-bottom: var(--gap-sm);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.case-study .box-label::before { content: "◆"; font-size: 0.7rem; }

.case-study .box-title {
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gold-dark);
  margin-bottom: var(--gap-md);
}

.case-study p { font-size: 0.96rem; }
.case-study p:last-child { margin-bottom: 0; }


/* ---- 10e. THOUGHT QUESTIONS -------------------------------- */
.thought-questions {
  background: var(--gold-xlight);
  border: 1px solid #f0d590;
  border-left: 5px solid var(--gold-mid);
  border-radius: var(--radius-lg);
  padding: var(--gap-lg);
  margin: var(--gap-lg) 0;
}

.thought-questions .box-label {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--gold-dark);
  margin-bottom: var(--gap-sm);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.thought-questions .box-label::before { content: "?"; font-size: 1rem; font-weight: 900; }

.thought-questions ol {
  margin: 0;
  padding-left: 1.5em;
}
.thought-questions li {
  font-size: 0.96rem;
  font-style: italic;
  margin-bottom: 0.5em;
  color: var(--gold-dark);
}
.thought-questions li strong { font-style: normal; color: var(--gold-dark); }


/* ---- 10f. KEY POINTS --------------------------------------- */
.key-points {
  background: var(--green-xlight);
  border: 1px solid #b2dfb3;
  border-left: 5px solid var(--green-mid);
  border-radius: var(--radius-lg);
  padding: var(--gap-lg);
  margin: var(--gap-lg) 0;
}

.key-points .box-label {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--green-dark);
  margin-bottom: var(--gap-sm);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.key-points .box-label::before { content: "✓"; font-size: 0.9rem; }

.key-points ul {
  margin: 0;
  padding-left: 1.5em;
}
.key-points li {
  font-size: 0.96rem;
  margin-bottom: 0.45em;
}
.key-points li strong { color: var(--green-dark); }


/* ---- 10g. QUOTE BLOCKS ------------------------------------- */
blockquote.quote-block {
  border-left: 5px solid var(--gray-mid);
  background: var(--gray-xlight);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--gap-md) var(--gap-lg);
  margin: var(--gap-lg) 0;
  color: var(--gray-dark);
  font-style: italic;
}

blockquote.quote-block p {
  font-size: 1.08rem;
  line-height: 1.8;
  margin: 0 0 var(--gap-sm);
  text-indent: 0;
}
blockquote.quote-block p::before { content: "\201C"; font-size: 2rem; line-height: 0; vertical-align: -0.5rem; color: var(--gray-mid); margin-right: 0.1em; }
blockquote.quote-block p::after  { content: "\201D"; font-size: 2rem; line-height: 0; vertical-align: -0.5rem; color: var(--gray-mid); margin-left: 0.1em; }

blockquote.quote-block cite {
  display: block;
  font-size: 0.88rem;
  font-style: normal;
  font-family: var(--font-ui);
  color: var(--gray-mid);
  text-align: right;
}
blockquote.quote-block cite::before { content: "— "; }


/* ---- 10h. DEFINITION BOXES --------------------------------- */
.definition-box {
  background: var(--blue-xlight);
  border: 1px solid var(--blue-light);
  border-radius: var(--radius);
  padding: var(--gap-md) var(--gap-lg);
  margin: var(--gap-md) 0;
}

.definition-box .term {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 1rem;
  color: var(--blue-dark);
  margin-bottom: 0.35rem;
}
.definition-box .definition {
  font-size: 0.95rem;
  color: var(--color-text);
  margin: 0;
}


/* ---- 10i. PRO / OBJECTION BOXES ---------------------------- */
.pro-argument {
  background: var(--green-xlight);
  border-left: 5px solid var(--green-mid);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--gap-md) var(--gap-lg);
  margin: var(--gap-md) 0;
}
.pro-argument .box-label {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--green-dark);
  margin-bottom: var(--gap-sm);
}
.pro-argument .box-label::before { content: "+ "; }

.objection {
  background: var(--red-xlight);
  border-left: 5px solid var(--red-mid);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--gap-md) var(--gap-lg);
  margin: var(--gap-md) 0;
}
.objection .box-label {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--red-dark);
  margin-bottom: var(--gap-sm);
}
.objection .box-label::before { content: "– "; }

.pro-argument p:last-child,
.objection p:last-child { margin-bottom: 0; }


/* ============================================================
   11. TABLES
   ============================================================ */
.table-wrapper {
  overflow-x: auto;
  margin: var(--gap-lg) 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  font-family: var(--font-ui);
  background: var(--color-surface);
}

table caption {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-style: italic;
  color: var(--color-text-muted);
  padding: 0.5rem 0;
  text-align: left;
}

thead th {
  background: var(--chapter-color);
  color: #fff;
  font-weight: 600;
  padding: 0.65rem 1rem;
  text-align: left;
  vertical-align: bottom;
  border-bottom: 2px solid rgba(255,255,255,.25);
}

tbody tr:nth-child(even) { background: var(--chapter-light); }
tbody tr:hover           { background: var(--blue-light); }

td {
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  color: var(--color-text);
}

td:first-child { font-weight: 600; color: var(--blue-dark); }


/* ============================================================
   12. FIGURES & DIAGRAMS
   ============================================================ */
figure {
  margin: var(--gap-lg) 0;
  text-align: center;
}

figure svg,
figure img {
  max-width: 100%;
  margin: 0 auto;
  border-radius: var(--radius);
}

figcaption {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: 0.6rem;
  text-align: center;
}

/* Mermaid diagrams */
.mermaid {
  background: var(--gray-xlight);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--gap-md);
  margin: var(--gap-lg) 0;
  overflow-x: auto;
  text-align: center;
}


/* ============================================================
   13. CHAPTER FOOTER
   ============================================================ */
.chapter-footer {
  background: var(--gray-xlight);
  border-top: 1px solid var(--color-border);
  padding: var(--gap-lg);
  font-family: var(--font-ui);
}

.chapter-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--content-max);
  margin: 0 auto var(--gap-md);
  gap: var(--gap-md);
}

.footer-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  background: var(--chapter-color);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transition: opacity .15s;
}
.footer-nav-btn:hover { opacity: 0.88; text-decoration: none; }
.footer-nav-btn.disabled { background: var(--gray-light); color: var(--gray-mid); pointer-events: none; }

.chapter-footer-meta {
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  max-width: var(--content-max);
  margin: 0 auto;
}
.chapter-footer-meta a { color: var(--blue-mid); }


/* ============================================================
   14. RESPONSIVE
   ============================================================ */
@media (max-width: 680px) {
  html { font-size: 16px; }

  .content-area { padding: var(--gap-md); }

  .chapter-header { padding: 2rem var(--gap-md) 1.5rem; }
  .chapter-header h1 { font-size: 1.65rem; }

  h2 { font-size: 1.3rem; }

  .top-nav { padding: 0.55rem 1rem; }
  .nav-home { font-size: 0.85rem; }

  .key-thinker {
    grid-template-columns: 1fr;
  }
  .thinker-portrait,
  .thinker-portrait-placeholder {
    width: 72px;
    height: 72px;
    grid-row: auto;
    margin-bottom: var(--gap-sm);
  }
  .thinker-body { grid-column: 1; }
  /* rectangular portrait: stack vertically on mobile */
  .thinker-img-wrap {
    width: 100%;
    max-width: 240px;
    grid-row: auto;
    margin: 0 auto var(--gap-sm);
  }
  .thinker-bio { grid-column: 1; }

  .chapter-footer-nav { flex-direction: column; gap: var(--gap-sm); }
  .footer-nav-btn { width: 100%; justify-content: center; }

  .chapter-grid { grid-template-columns: 1fr; }

  .index-hero h1 { font-size: 2rem; }
}

@media (max-width: 420px) {
  .chapter-nav { gap: var(--gap-sm); }
  .nav-prev, .nav-next { padding: 0.2rem 0.5rem; font-size: 0.8rem; }
  .nav-chapter { display: none; }
}


/* ============================================================
   15. PRINT STYLES
   ============================================================ */
@media print {
  .top-nav,
  .toc-box,
  .chapter-footer-nav { display: none; }

  body { font-size: 11pt; background: #fff; color: #000; }

  .content-area { max-width: 100%; padding: 0; }

  h2 { border-bottom: 1px solid #000; }

  .central-questions,
  .argument-box,
  .case-study,
  .thought-questions,
  .key-points,
  .key-thinker,
  .definition-box,
  .pro-argument,
  .objection {
    border: 1pt solid #888;
    page-break-inside: avoid;
  }

  blockquote.quote-block {
    border-left: 3pt solid #888;
    background: none;
  }

  table { font-size: 9pt; }
  thead th { background: #333 !important; color: #fff !important; }
}


/* ============================================================
   16. CITATIONS & BIBLIOGRAPHY  (cite.js)
   ============================================================ */

/* Inline citation link produced by cite.js */
cite .cite-link,
cite a.cite-link {
  color: var(--chapter-color);
  font-style: normal;
  text-decoration: none;
  border-bottom: 1px dotted var(--chapter-color);
}
cite .cite-link:hover,
cite a.cite-link:hover {
  text-decoration: none;
  border-bottom-style: solid;
}

/* References section */
#references-section {
  border-top: 2px solid var(--color-border);
  margin-top: var(--gap-xl);
  padding-top: var(--gap-lg);
}

#references-section h2 {
  border-bottom: none;
  margin-top: 0;
}

/* Bibliography ordered list */
.bibliography-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.bib-entry {
  padding: var(--gap-sm) 0 var(--gap-sm) 2.4em;
  text-indent: -2.4em;
  border-bottom: 1px solid var(--gray-light);
  color: var(--color-text);
  margin: 0;
}

.bib-entry:last-child { border-bottom: none; }

.bib-entry em { font-style: italic; }

.bib-entry a {
  color: var(--blue-mid);
  word-break: break-all;
  font-size: 0.85rem;
}

/* Loading / error states */
cite[data-key]::before {
  content: "[loading…]";
  color: var(--gray-mid);
  font-style: italic;
  font-size: 0.9em;
}
/* Once cite.js resolves the citation, the data-key is removed and
   data-resolved is set — hide the pseudo-element */
cite[data-resolved]::before { content: none; }

@media print {
  .bib-entry { page-break-inside: avoid; }
  .bib-entry a { color: #000; }
  .bib-entry a::after { content: " (" attr(href) ")"; font-size: 8pt; }
}