/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-card: #1c2128;
  --border: #30363d;
  --border-active: #58a6ff;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent-blue: #58a6ff;
  --accent-green: #3fb950;
  --accent-red: #f85149;
  --accent-orange: #d29922;
  --accent-purple: #bc8cff;
  --accent-cyan: #39d2c0;
  --code-bg: #0d1117;
  --code-text: #79c0ff;
  --correct: #238636;
  --incorrect: #da3633;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas, 'Courier New', monospace;
  --max-width: 900px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

/* === Header === */
.site-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 2rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.header-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 0.5rem;
}

.header-text {
  display: flex;
  flex-direction: column;
}

.site-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.1rem;
  line-height: 1.2;
}

.site-title span { color: var(--accent-blue); }

.site-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.site-version {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.site-version strong {
  color: var(--accent-orange);
}

/* === Start Here Panel === */
.start-here {
  background: rgba(88, 166, 255, 0.07);
  border: 1px solid var(--accent-blue);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.start-here-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  margin-bottom: 1rem;
}

.start-here-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.start-here-option {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.start-here-option strong {
  color: var(--text-primary);
  display: block;
  margin-bottom: 0.2rem;
}

.tab-btn-inline {
  background: none;
  border: none;
  color: var(--accent-blue);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.tab-btn-inline:hover { color: var(--text-primary); }

.time-estimate {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

/* === Comparison Table === */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.85rem;
}
.compare-table th, .compare-table td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: center;
  vertical-align: top;
}
.compare-table th {
  background: var(--bg-tertiary);
  color: var(--accent-blue);
  font-weight: 600;
}
.compare-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}
.compare-table td { color: var(--text-secondary); }
.compare-table tr:nth-child(even) { background: var(--bg-secondary); }
.check { color: var(--accent-green); }
.cross { color: var(--accent-red); }
.partial { color: var(--accent-orange); }

/* === Start Here Grid === */
.starthere-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.starthere-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1rem 1.25rem;
}

.starthere-who {
  font-weight: 600;
  color: #b8d44a;
  font-size: 0.9rem;
  margin-bottom: 0.6rem;
  line-height: 1.4;
}

.starthere-path {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* === IQ/Awareness Bar Charts === */
.iq-grid {
  display: grid;
  grid-template-columns: 160px 1fr 1fr;
  gap: 0.4rem 0.75rem;
  align-items: center;
  margin: 1.25rem 0;
  font-size: 0.82rem;
}

.iq-grid .header {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border);
}

.iq-grid .model-name {
  color: var(--text-primary);
  font-weight: 600;
}

.iq-grid .sub { color: var(--text-muted); font-size: 0.75rem; font-weight: 400; }

.bar-wrap {
  background: var(--bg-tertiary);
  border-radius: 3px;
  height: 20px;
  position: relative;
  overflow: hidden;
}

.bar {
  height: 100%;
  border-radius: 3px;
  position: relative;
  min-width: 2px;
  transition: width 0.3s ease;
}

.bar-label {
  position: absolute;
  right: 6px;
  top: 0;
  line-height: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  pointer-events: none;
}

.bar-label.outside {
  right: auto;
  left: calc(100% + 6px);
  color: var(--text-secondary);
  white-space: nowrap;
}

.bar.iq-bar    { background: linear-gradient(90deg, var(--accent-blue), #1e6fb5); }
.bar.aware-bar { background: linear-gradient(90deg, var(--accent-green), #1a6b3a); }
.bar.iq-low    { background: linear-gradient(90deg, var(--accent-red), #8b2020); }
.bar.aware-low { background: linear-gradient(90deg, var(--accent-orange), #a05a00); }

/* === Compare Page Section Dividers === */
.compare-section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.compare-section-title.orange { color: var(--accent-orange); }
.compare-section-title.green  { color: var(--accent-green); }
.compare-section-title.purple { color: var(--accent-purple); }
.compare-section-title.red    { color: var(--accent-red); }
.compare-section-title.blue   { color: var(--accent-blue); }

/* === Glossary back-links === */
/* Glossary tables - prevent I-beam on all cells */
#glossary td { cursor: default; user-select: none; }
#glossary td:first-child { color: var(--text-primary); font-weight: 600; }
#glossary tr:has(.gloss-link) { cursor: pointer; }
#glossary tr:has(.gloss-link):hover td:first-child { background: var(--bg-tertiary); }

/* Dashed underline on clickable term names — matches the .tt style in body text */
#glossary tr:has(.gloss-link) td:first-child {
  text-decoration: underline;
  text-decoration-style: dashed;
  text-decoration-color: var(--text-muted);
  text-underline-offset: 3px;
  cursor: pointer;
}
#glossary tr:has(.gloss-link):hover td:first-child {
  text-decoration-color: var(--accent-blue);
}
/* Definition column is copy-only — normal text cursor, no row-highlight bleed */
#glossary td:nth-child(2) {
  cursor: text;
  user-select: text;
}

.gloss-link {
  color: var(--accent-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-size: 0.78rem;
  font-weight: 600;
  opacity: 0.8;
  margin-left: 0.5rem;
  white-space: nowrap;
  cursor: pointer;
  display: inline-block;
}
.gloss-link:hover { opacity: 1; color: var(--text-primary); }

/* === Demystify table — Anthropic rows === */
tr.anthropic-row { background: rgba(140, 60, 180, 0.15) !important; }
tr.anthropic-row td { color: var(--text-primary); }

/* === MCP Dev page === */
#mcpdev h2 {
  margin-bottom: 1.25rem;
}
#mcpdev pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 0.75rem 0 1.25rem;
  font-size: 0.8rem;
  line-height: 1.6;
}
#mcpdev .compare-section-title {
  margin-top: 2rem;
  font-size: 1.1rem;
}
#mcpdev ul li, #mcpdev ol li {
  margin-bottom: 0.6rem;
}
#mcpdev p {
  margin-bottom: 0.85rem;
}

/* === CLAUDE.md Wizard === */
.wizard-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}
.wizard-container h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.25rem;
}
.wizard-container > p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}
.wizard-field {
  margin-bottom: 1rem;
}
.wizard-field label, .wizard-toggle-label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
}
.wizard-field input[type="text"],
.wizard-field select {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.4rem 0.6rem;
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: var(--font-sans);
}
.wizard-field input[type="text"]:focus,
.wizard-field select:focus {
  outline: none;
  border-color: var(--accent-blue);
}
.wizard-field input::placeholder { color: var(--text-muted); }
.wizard-toggle {
  margin-bottom: 1rem;
}
.wizard-toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 0.85rem;
  margin-bottom: 0;
}
.wizard-toggle-label input[type="checkbox"] {
  accent-color: var(--accent-blue);
  cursor: pointer;
}
.wizard-sub {
  display: none;
  margin-top: 0.75rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
}
.wizard-sub.open { display: block; }
.wizard-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.wizard-row input { flex: 1; }
.wizard-row span {
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-shrink: 0;
}
.wizard-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.25rem 0;
}
.wizard-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}
.wizard-btn {
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  border: none;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
.wizard-btn:hover { opacity: 0.85; }
.wizard-btn-claude {
  background: var(--accent-orange);
  color: #000;
}
.wizard-btn-codex {
  background: var(--accent-blue);
  color: #000;
}

/* === Making a Plugin page === */
/* Case Study page */
#casestudy2 h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin: 2rem 0 0.6rem;
  padding-top: 1.25rem;
  padding-bottom: 0.4rem;
  border-top: 1px solid var(--border);
}
#casestudy2 h4:first-of-type {
  border-top: none;
  margin-top: 1rem;
  padding-top: 0;
}
#casestudy h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
  border-top: 1px solid var(--border);
}
#casestudy h3:first-of-type {
  border-top: none;
  margin-top: 1rem;
  padding-top: 0;
}
#casestudy pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  font-size: 0.78rem;
  line-height: 1.65;
  white-space: pre-wrap;
}
#casestudy p {
  margin-bottom: 0.9rem;
}
#casestudy-version-table td {
  text-align: left;
}
#casestudy ul > li {
  margin-bottom: 0.5rem;
}

#makeplugin h2 {
  margin-bottom: 0.5rem;
}
#makeplugin h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin: 2.5rem 0 0.75rem;
  padding-top: 1.5rem;
  padding-bottom: 0.5rem;
  border-top: 1px solid var(--border);
}
#makeplugin h3:first-of-type {
  border-top: none;
  margin-top: 1.5rem;
  padding-top: 0;
}
#makeplugin pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 0.75rem 0 1.25rem;
  font-size: 0.8rem;
  line-height: 1.6;
}
#makeplugin p {
  margin-bottom: 0.9rem;
}
#makeplugin ol > li, #makeplugin ul > li {
  margin-bottom: 0.6rem;
}
#makeplugin ol > li > ul {
  margin-top: 0.4rem;
}
#makeplugin strong {
  color: var(--text-primary);
}
#makeplugin .compare-table td:first-child {
  white-space: normal;
}

/* === Sequence Diagram === */
.seq-diagram {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.25rem 0;
  overflow-x: auto;
}

.seq-diagram svg {
  display: block;
  width: 100%;
  min-width: 700px;
}

/* === Advanced Info Box === */
.advanced-box {
  border: 2px solid var(--accent-blue);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
  margin: 1.5rem 0;
  background: rgba(88, 166, 255, 0.04);
}

.advanced-box-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-blue);
  margin-bottom: 1rem;
}

.advanced-box h3 {
  color: var(--accent-blue);
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

/* === About === */
.about-section { text-align: center; padding: 3rem 1rem; }
.about-ascii { font-family: var(--font-mono); font-size: 0.55rem; line-height: 1.1; color: var(--accent-blue); white-space: pre; display: inline-block; margin: 1.5rem 0; }
.about-name { font-size: 1.4rem; font-weight: 700; color: var(--text-primary); margin: 1rem 0 0.3rem; }
.about-credit { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 2rem; }

/* === Search === */
.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.search-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1rem;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  border-radius: 4px;
  margin-right: 0.4rem;
  transition: color 0.15s, border-color 0.15s;
}
.search-btn:hover { color: var(--accent-blue); border-color: var(--accent-blue); }

.search-box {
  display: none;
  align-items: center;
  gap: 0.3rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--accent-blue);
  border-radius: 6px 0 6px 6px;
  padding: 0.25rem 0.5rem;
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 300;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}
.search-box.open { display: flex; }

#search-input {
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  width: 200px;
  outline: none;
  padding: 0.1rem 0.2rem;
}
#search-input::placeholder { color: var(--text-muted); }

.search-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 50px;
}

.search-nav, .search-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.1rem 0.3rem;
  font-size: 0.85rem;
  border-radius: 3px;
}
.search-nav:hover, .search-close:hover { color: var(--accent-blue); background: var(--bg-secondary); }

.search-highlight {
  background: #ffea00;
  color: #000;
  border-radius: 2px;
  padding: 0 1px;
}

.search-highlight.current {
  background: #ff9100;
  color: #000;
}

/* === Navigation === */
.tab-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin: 0 -0.5rem;
  position: relative;
  width: calc(100% + 1rem);
}

.header-top {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
}


.hamburger-wrap {
  position: relative;
  flex-shrink: 0;
}

.hamburger-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.3rem;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 0.25rem;
  transition: color 0.15s, border-color 0.15s;
}
.hamburger-btn:hover { color: var(--accent-blue); border-color: var(--accent-blue); }

.nav-drawer {
  display: none;
  flex-direction: column;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  position: absolute;
  left: 0;
  top: 100%;
  width: 220px;
  z-index: 200;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  border-radius: 0 6px 6px 6px;
}

.nav-drawer.open { display: flex; }

.nav-drawer .tab-btn {
  text-align: left;
  padding: 0.65rem 1.1rem;
  border-bottom: 1px solid var(--border);
  white-space: normal;
  word-wrap: break-word;
}
.nav-drawer .tab-btn:last-child { border-bottom: none; }

.tab-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  position: relative;
  transition: color 0.15s;
  white-space: nowrap;
}

.tab-btn:hover { color: var(--text-primary); }

.tab-btn.active {
  color: var(--accent-blue);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 2px 2px 0 0;
}

/* === Main Content === */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* === Manifesto (Chapters) === */
.chapter {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 10rem;
}

.chapter:last-child { border-bottom: none; }

.chapter-number {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.35rem;
}

.chapter h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.chapter h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
  color: var(--accent-cyan);
}

.chapter p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.chapter ul, .chapter ol {
  margin: 0.75rem 0 1rem 1.5rem;
  color: var(--text-primary);
}

.chapter li { margin-bottom: 0.4rem; }

/* Global list indentation for all tab panels (fixes bullet wrap issue) */
.tab-panel ul, .tab-panel ol {
  padding-left: 1.5rem;
  margin: 0.75rem 0 1rem;
  color: var(--text-primary);
}
.tab-panel li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
  padding-left: 0.25rem;
}
.tab-panel p {
  margin-bottom: 0.9rem;
  line-height: 1.7;
}

/* Pricing page section titles with more visual variety */
#pricing .compare-section-title.blue   { font-size: 1.2rem; }
#pricing .compare-section-title.green  { font-size: 1.2rem; }
#pricing .compare-section-title.orange { font-size: 1.2rem; }
#pricing .compare-section-title.purple { font-size: 1.2rem; }
#pricing .compare-section-title.red    { font-size: 1.2rem; }

#pricing h3 {
  color: var(--accent-blue);
  font-size: 1rem;
  margin: 1.5rem 0 0.5rem;
}

#pricing strong { color: var(--text-primary); }

#pricing li strong:first-child { color: var(--accent-cyan); }

/* Analogy callouts */
.analogy {
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent-orange);
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.analogy::before {
  content: 'Developer Analogy';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-orange);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.analogy-alt {
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent-purple);
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.analogy-alt::before {
  content: 'Windows Dev Analogy';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-purple);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.analogy-human {
  background: rgba(63, 185, 80, 0.07);
  border-left: 3px solid var(--accent-green);
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.analogy-human::before {
  content: 'Non-Developer Analogy';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-green);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

/* Frustration acknowledgment */
.real-talk {
  background: rgba(248, 81, 73, 0.08);
  border-left: 3px solid var(--accent-red);
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.real-talk::before {
  content: 'Reality Check';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-red);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.aha {
  background: rgba(88, 166, 255, 0.08);
  border-left: 3px solid var(--accent-blue);
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.aha::before {
  content: 'Aha';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

/* Confusion card — rainbow gradient stripe */
.confusion {
  background:
    linear-gradient(to bottom, #f85149, #d29922, #3fb950, #39d2c0, #58a6ff, #bc8cff) left / 3px 100% no-repeat,
    rgba(188, 140, 255, 0.04);
  padding: 0.85rem 1.1rem 0.85rem 1.25rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.confusion::before {
  content: 'Possibly Confusing';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  background: linear-gradient(to right, #f85149, #d29922, #3fb950, #39d2c0, #58a6ff, #bc8cff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.insight {
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid #e6edf3;
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.insight::before {
  content: 'Insight';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: #e6edf3;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.gotcha {
  background: rgba(210, 100, 30, 0.08);
  border-left: 3px solid #d4601e;
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.gotcha::before {
  content: 'Gotcha';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: #d4601e;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.real-world {
  background: rgba(57, 210, 192, 0.08);
  border-left: 3px solid var(--accent-cyan);
  padding: 0.85rem 1.1rem;
  margin: 1rem 0;
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}

.real-world::before {
  content: 'Real-World Application';
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

/* === Glossary Tooltips === */
.tt {
  cursor: pointer;
  text-decoration: none;
}
body.show-gloss-underlines .tt {
  border-bottom: 1px dashed var(--text-muted);
}

/* Gloss toggle checkbox in hamburger drawer */
.drawer-divider {
  border-top: 1px solid var(--border);
  margin: 0.4rem 0;
}
.gloss-toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  width: 100%;
}
.gloss-toggle-label:hover {
  color: var(--text-primary);
}
.gloss-toggle-label input {
  cursor: pointer;
  accent-color: var(--accent-blue);
}

#tt-popup {
  position: fixed;
  z-index: 9999;
  background: var(--bg-tertiary);
  border: 1px solid var(--accent-blue);
  border-radius: 6px;
  padding: 0.6rem 0.9rem;
  max-width: 320px;
  font-size: 0.82rem;
  color: var(--text-primary);
  line-height: 1.5;
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  display: none;
}

#tt-popup .tt-term {
  font-weight: 700;
  color: var(--accent-blue);
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Code blocks */
code {
  font-family: var(--font-mono);
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
  border: 1px solid var(--border);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0;
  line-height: 1.5;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  color: var(--text-primary);
}

/* Key-value layout for filesystem sections */
.path-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.path-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.path-table td:first-child {
  font-family: var(--font-mono);
  color: var(--code-text);
  white-space: nowrap;
  width: 40%;
}

.path-table td:last-child {
  color: var(--text-secondary);
}

/* === Quiz === */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.quiz-title { font-size: 1.3rem; font-weight: 700; }

.quiz-score {
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  border: 1px solid var(--border);
}

.quiz-score .correct { color: var(--accent-green); font-weight: 600; }
.quiz-score .total { color: var(--text-muted); }

.quiz-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.quiz-controls button {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.quiz-controls button:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.quiz-controls button.active-filter {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  transition: border-color 0.2s;
}

.question-card.answered-correct { border-color: var(--correct); }
.question-card.answered-incorrect { border-color: var(--incorrect); }

.question-num {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.question-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.choice-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.65rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
  line-height: 1.5;
}

.choice-btn:hover:not(:disabled) {
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.06);
}

.choice-btn:disabled { cursor: default; opacity: 0.85; }

.choice-btn.selected-correct {
  border-color: var(--correct);
  background: rgba(35, 134, 54, 0.15);
  color: var(--accent-green);
}

.choice-btn.selected-incorrect {
  border-color: var(--incorrect);
  background: rgba(218, 54, 51, 0.15);
  color: var(--accent-red);
}

.choice-btn.reveal-correct {
  border-color: var(--correct);
  background: rgba(35, 134, 54, 0.08);
}

.explanation {
  display: none;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  background: var(--bg-tertiary);
  border-radius: 6px;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-secondary);
  border-left: 3px solid var(--accent-green);
}

.explanation.visible { display: block; }

.explanation strong { color: var(--text-primary); }

/* === Progress bar for quiz === */
.progress-bar-container {
  background: var(--bg-tertiary);
  border-radius: 4px;
  height: 6px;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--accent-blue);
  border-radius: 4px;
  transition: width 0.3s ease;
  width: 0%;
}

/* === Table of Contents === */
.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.toc h3 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.toc ol {
  list-style: none;
  counter-reset: toc-counter;
  padding: 0;
}

.toc li {
  counter-increment: toc-counter;
  margin-bottom: 0.3rem;
}

.toc li::before {
  content: counter(toc-counter) ".";
  color: var(--accent-blue);
  font-weight: 600;
  font-size: 0.8rem;
  margin-right: 0.5rem;
}

.toc a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}

.toc a:hover { color: var(--accent-blue); }

/* === Final score summary === */
.final-score {
  text-align: center;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 2rem;
  display: none;
}

.final-score.visible { display: block; }

.final-score .big-score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent-blue);
}

.final-score .label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.final-score .reset-btn {
  margin-top: 1rem;
  background: var(--accent-blue);
  color: #fff;
  border: none;
  padding: 0.6rem 1.5rem;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  transition: opacity 0.15s;
}

.final-score .reset-btn:hover { opacity: 0.85; }

/* === Responsive === */
@media (max-width: 700px) {
  .site-header { padding: 1rem 1rem 0; }
  .main-content { padding: 1.25rem; }
  .site-title { font-size: 1.25rem; }
  .tab-btn { font-size: 0.78rem; padding: 0.6rem 0.75rem; }
  .chapter h2 { font-size: 1.25rem; }
  .question-card { padding: 1rem; }
  .path-table td:first-child { white-space: normal; }
  .quiz-header { flex-direction: column; gap: 0.75rem; align-items: flex-start; }
}

/* === Tab Link Copy Icon === */
.tab-link-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.2rem;
  border-radius: 4px;
  flex-shrink: 0;
  transition: color 0.15s, background 0.15s;
  vertical-align: middle;
}
.tab-link-icon:hover {
  color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
}
.tab-link-icon.copied {
  color: var(--accent-green);
}
.tab-link-icon.copied::after {
  content: 'Copied!';
  position: absolute;
  background: var(--bg-tertiary);
  color: var(--accent-green);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
  margin-left: 0.25rem;
  pointer-events: none;
}