/* Lecture 05 webpage enhancements. Scoped by inclusion to this page only. */

:root {
  --l05-navy: #212a54;
  --l05-blue: #234c73;
  --l05-coral: #ee6331;
  --l05-teal: #247b80;
  --l05-green: #2e7d52;
  --l05-gold: #b86b00;
  --l05-red: #8b1a1a;
  --l05-radius: 18px;
  --l05-shadow: 0 12px 34px rgba(33, 42, 84, 0.09);
  --l05-soft-shadow: 0 5px 18px rgba(33, 42, 84, 0.07);
  --l05-rule: color-mix(in srgb, var(--bs-body-color) 14%, transparent);
  --l05-surface: color-mix(in srgb, var(--bs-body-bg) 96%, var(--l05-blue) 4%);
  --l05-surface-strong: color-mix(in srgb, var(--bs-body-bg) 91%, var(--l05-blue) 9%);
}

html {
  scroll-behavior: smooth;
}

#lecture-reading-progress {
  background: linear-gradient(90deg, var(--l05-coral), #d89919, var(--l05-teal));
  box-shadow: 0 1px 5px rgba(33, 42, 84, 0.25);
  height: 4px;
  left: 0;
  position: fixed;
  top: 0;
  transform: scaleX(var(--lecture-progress, 0));
  transform-origin: left center;
  width: 100%;
  z-index: 1055;
}

#quarto-document-content {
  --l05-section-accent: var(--l05-coral);
  position: relative;
}

#quarto-document-content p,
#quarto-document-content li {
  line-height: 1.68;
}

#quarto-document-content p {
  max-width: 68ch;
}

/* Opening outline */
#quarto-document-content > .objectives {
  background:
    radial-gradient(circle at 92% 12%, color-mix(in srgb, var(--l05-coral) 20%, transparent) 0 3.8rem, transparent 3.9rem),
    linear-gradient(135deg, color-mix(in srgb, var(--bs-body-bg) 88%, #fff4d8 12%), color-mix(in srgb, var(--bs-body-bg) 92%, #daee84 8%));
  border: 1px solid color-mix(in srgb, var(--l05-gold) 32%, transparent);
  border-radius: var(--l05-radius);
  box-shadow: var(--l05-soft-shadow);
  margin: 0 0 1.4rem;
  overflow: hidden;
  padding: 1.15rem 1.3rem 1.2rem;
  position: relative;
}

#quarto-document-content > .objectives::before {
  background: var(--l05-coral);
  border-radius: 0 0 999px 999px;
  content: "";
  height: 5px;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}

#quarto-document-content > .objectives > p:first-child {
  color: var(--l05-red);
  font-family: "Roboto Condensed", sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin: 0 0 0.65rem;
}

#quarto-document-content > .objectives > ul {
  margin-bottom: 0;
}

/* Three-part lecture map, generated from existing level-one headings. */
.lecture-roadmap {
  background: linear-gradient(145deg, color-mix(in srgb, var(--bs-body-bg) 93%, var(--l05-navy) 7%), var(--bs-body-bg));
  border: 1px solid var(--l05-rule);
  border-radius: var(--l05-radius);
  box-shadow: var(--l05-shadow);
  margin: 1.35rem 0 2.4rem;
  padding: 1rem;
}

.lecture-roadmap__label {
  color: color-mix(in srgb, var(--bs-body-color) 72%, transparent);
  display: block;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 0.15rem 0.25rem 0.7rem;
  text-transform: uppercase;
}

.lecture-roadmap ol {
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}

.lecture-roadmap a {
  align-items: center;
  background: color-mix(in srgb, var(--bs-body-bg) 93%, var(--roadmap-accent, var(--l05-coral)) 7%);
  border: 1px solid color-mix(in srgb, var(--roadmap-accent, var(--l05-coral)) 24%, transparent);
  border-radius: 14px;
  color: var(--bs-body-color);
  display: grid;
  gap: 0.1rem 0.65rem;
  grid-template-columns: auto 1fr;
  min-height: 4.4rem;
  padding: 0.7rem 0.8rem;
  text-decoration: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.lecture-roadmap li:nth-child(1) { --roadmap-accent: var(--l05-coral); }
.lecture-roadmap li:nth-child(2) { --roadmap-accent: var(--l05-teal); }
.lecture-roadmap li:nth-child(3) { --roadmap-accent: var(--l05-green); }

.lecture-roadmap a:hover,
.lecture-roadmap a:focus-visible {
  border-color: var(--roadmap-accent);
  box-shadow: 0 8px 20px color-mix(in srgb, var(--roadmap-accent) 20%, transparent);
  transform: translateY(-2px);
}

.lecture-roadmap__number {
  align-items: center;
  background: var(--roadmap-accent);
  border-radius: 50%;
  color: #fff;
  display: inline-flex;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  grid-row: 1 / span 2;
  height: 2.15rem;
  justify-content: center;
  width: 2.15rem;
}

.lecture-roadmap__title {
  font-family: "Roboto Condensed", sans-serif;
  font-size: 0.93rem;
  font-weight: 700;
  line-height: 1.18;
}

.lecture-roadmap__cue {
  color: color-mix(in srgb, var(--bs-body-color) 66%, transparent);
  font-size: 0.72rem;
  line-height: 1.15;
}

/* Major chapters */
#quarto-document-content > section.level1 {
  --l05-section-accent: var(--l05-coral);
  counter-reset: l05-card;
  margin-top: 3.2rem;
}

#quarto-document-content > section.level1:nth-of-type(2) {
  --l05-section-accent: var(--l05-teal);
}

#quarto-document-content > section.level1:nth-of-type(3) {
  --l05-section-accent: var(--l05-green);
}

#quarto-document-content > section.level1 > h1 {
  align-items: center;
  background:
    radial-gradient(circle at 90% 20%, rgba(255, 255, 255, 0.16) 0 3.2rem, transparent 3.3rem),
    linear-gradient(125deg, var(--l05-navy), color-mix(in srgb, var(--l05-navy) 66%, var(--l05-section-accent) 34%));
  border: 0;
  border-radius: var(--l05-radius);
  box-shadow: var(--l05-shadow);
  color: #fff;
  display: flex;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  gap: 0.7rem;
  margin: 0 0 1.5rem;
  overflow: hidden;
  padding: 1.15rem 1.3rem;
  position: relative;
}

#quarto-document-content > section.level1 > h1 .header-section-number {
  align-items: center;
  background: var(--l05-section-accent);
  border: 2px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
  display: inline-flex;
  flex: 0 0 auto;
  font-size: 0.92rem;
  height: 2.35rem;
  justify-content: center;
  width: 2.35rem;
}

/* Each concept becomes a readable visual unit. */
#quarto-document-content section.level2 {
  background: linear-gradient(150deg, color-mix(in srgb, var(--bs-body-bg) 97%, var(--l05-section-accent) 3%), var(--bs-body-bg));
  border: 1px solid var(--l05-rule);
  border-left: 5px solid var(--l05-section-accent);
  border-radius: var(--l05-radius);
  box-shadow: var(--l05-soft-shadow);
  margin: 1.55rem 0;
  overflow: hidden;
  padding: 1.15rem 1.25rem 1.3rem;
  scroll-margin-top: 5rem;
}

#quarto-document-content section.level2 > h2 {
  align-items: center;
  border-bottom: 1px solid var(--l05-rule);
  display: flex;
  font-size: clamp(1.28rem, 2.2vw, 1.62rem);
  gap: 0.55rem;
  margin: -0.2rem 0 1rem;
  padding: 0.2rem 0 0.72rem;
}

#quarto-document-content section.level2 > h2 .header-section-number {
  background: color-mix(in srgb, var(--l05-section-accent) 14%, var(--bs-body-bg));
  border: 1px solid color-mix(in srgb, var(--l05-section-accent) 32%, transparent);
  border-radius: 999px;
  color: var(--l05-section-accent);
  font-family: "Roboto Condensed", sans-serif;
  font-size: 0.72em;
  padding: 0.22rem 0.48rem;
}

.lecture-heading-icon {
  align-items: center;
  background: color-mix(in srgb, var(--l05-section-accent) 12%, var(--bs-body-bg));
  border-radius: 9px;
  color: var(--l05-section-accent);
  display: inline-flex;
  flex: 0 0 auto;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  height: 1.65rem;
  justify-content: center;
  letter-spacing: -0.01em;
  order: -1;
  width: 1.65rem;
}

#quarto-document-content section.level3 {
  background: color-mix(in srgb, var(--bs-body-bg) 95%, var(--l05-section-accent) 5%);
  border-radius: 14px;
  margin: 1.2rem 0;
  padding: 0.85rem 1rem 1rem;
}

#quarto-document-content section.level3 > h3 {
  color: color-mix(in srgb, var(--bs-body-color) 84%, var(--l05-section-accent) 16%);
  font-size: 1.12rem;
  margin-top: 0;
}

/* Card grids for prose-heavy concept, definition, and comparison lists. */
:is(
  #definition-planned-contrasts,
  #example-of-planned-contrasts,
  #what-does-each-contrast-tell-us,
  #simple-vs.-complex-comparisons,
  #common-contrast-families,
  #orthogonal-vs.-non-orthogonal-contrasts,
  #constructing-orthogonal-planned-contrasts,
  #computing-planned-contrasts,
  #from-contrasts-to-coding-schemes,
  #summary
) > ul {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 21rem), 1fr));
  list-style: none;
  margin: 0.8rem 0 1rem;
  padding: 0;
}

:is(
  #definition-planned-contrasts,
  #example-of-planned-contrasts,
  #what-does-each-contrast-tell-us,
  #simple-vs.-complex-comparisons,
  #common-contrast-families,
  #orthogonal-vs.-non-orthogonal-contrasts,
  #constructing-orthogonal-planned-contrasts,
  #computing-planned-contrasts,
  #from-contrasts-to-coding-schemes,
  #summary
) > ul > li {
  background: color-mix(in srgb, var(--bs-body-bg) 94%, var(--l05-section-accent) 6%);
  border: 1px solid color-mix(in srgb, var(--l05-section-accent) 22%, transparent);
  border-radius: 13px;
  box-shadow: 0 3px 10px rgba(33, 42, 84, 0.05);
  margin: 0;
  padding: 0.85rem 0.95rem 0.85rem 1rem;
  position: relative;
}

:is(
  #definition-planned-contrasts,
  #example-of-planned-contrasts,
  #what-does-each-contrast-tell-us,
  #simple-vs.-complex-comparisons,
  #common-contrast-families,
  #orthogonal-vs.-non-orthogonal-contrasts,
  #constructing-orthogonal-planned-contrasts,
  #computing-planned-contrasts,
  #from-contrasts-to-coding-schemes,
  #summary
) > ul > li::before {
  background: var(--l05-section-accent);
  border-radius: 999px;
  content: "";
  height: 0.42rem;
  left: 1rem;
  position: absolute;
  top: -0.22rem;
  width: 2.35rem;
}

#quarto-document-content li > ul {
  margin-top: 0.42rem;
  padding-left: 1.15rem;
}

#quarto-document-content li > ul > li::marker {
  color: var(--l05-section-accent);
}

/* Number the four Section 1.2 cards in their reading order. */
#example-of-planned-contrasts > ul > li.lecture-sequence-card {
  padding-top: 3.15rem;
}

#example-of-planned-contrasts > ul > li.lecture-sequence-card::before {
  display: none;
}

.lecture-sequence-badge {
  align-items: center;
  background: linear-gradient(135deg, var(--l05-navy), var(--l05-section-accent));
  border: 2px solid color-mix(in srgb, var(--bs-body-bg) 78%, transparent);
  border-radius: 50%;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--l05-section-accent) 24%, transparent);
  color: #fff;
  display: inline-flex;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  height: 2rem;
  justify-content: center;
  left: 0.9rem;
  letter-spacing: 0.04em;
  line-height: 1;
  position: absolute;
  top: 0.62rem;
  width: 2rem;
  z-index: 1;
}

#example-of-planned-contrasts > ul > li.lecture-sequence-card::after {
  background: linear-gradient(90deg, color-mix(in srgb, var(--l05-section-accent) 46%, transparent), transparent);
  content: "";
  height: 1px;
  left: 3.35rem;
  position: absolute;
  right: 0.95rem;
  top: 1.62rem;
}

/* Definition cards use their existing first-line labels as visual title bars. */
#definition-planned-contrasts > ul > li.lecture-definition-card {
  --l05-card-accent: var(--l05-coral);
  isolation: isolate;
  overflow: hidden;
  transition: box-shadow 180ms ease, transform 180ms ease;
}

#definition-planned-contrasts > ul > li.lecture-definition-card:nth-child(2) {
  --l05-card-accent: var(--l05-teal);
}

#definition-planned-contrasts > ul > li.lecture-definition-card:nth-child(3) {
  --l05-card-accent: var(--l05-gold);
}

#definition-planned-contrasts > ul > li.lecture-definition-card::before {
  display: none;
}

#definition-planned-contrasts > ul > li.lecture-definition-card:hover {
  box-shadow: 0 10px 24px color-mix(in srgb, var(--l05-card-accent) 16%, transparent);
  transform: translateY(-2px);
}

.lecture-card-title {
  align-items: center;
  background:
    radial-gradient(circle at 92% 18%, rgba(255, 255, 255, 0.2) 0 2rem, transparent 2.05rem),
    linear-gradient(125deg, color-mix(in srgb, var(--l05-navy) 72%, var(--l05-card-accent) 28%), var(--l05-card-accent));
  border-radius: 11px 11px 8px 8px;
  box-shadow: 0 5px 14px color-mix(in srgb, var(--l05-card-accent) 22%, transparent);
  color: #fff;
  display: flex;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 1.02rem;
  font-weight: 700;
  gap: 0.62rem;
  letter-spacing: 0.01em;
  margin: -0.38rem -0.48rem 0.85rem;
  min-height: 2.85rem;
  overflow: hidden;
  padding: 0.52rem 0.68rem;
  position: relative;
}

.lecture-card-title__icon {
  align-items: center;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  display: inline-flex;
  flex: 0 0 auto;
  font-size: 0.78rem;
  height: 1.8rem;
  justify-content: center;
  line-height: 1;
  width: 1.8rem;
}

.lecture-card-title__label {
  position: relative;
  z-index: 1;
}

/* Marker-style emphasis is distinct from a hyperlink and remains readable in dark mode. */
#quarto-document-content .lecture-key-phrase {
  animation: l05-highlight-sweep 720ms cubic-bezier(0.22, 1, 0.36, 1) 180ms both;
  background-image: linear-gradient(
    105deg,
    color-mix(in srgb, var(--bs-body-bg) 58%, #f0c94d 42%),
    color-mix(in srgb, var(--bs-body-bg) 54%, var(--l05-coral) 46%) 52%,
    color-mix(in srgb, var(--bs-body-bg) 58%, #f0c94d 42%)
  );
  background-position: 0 50%;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  border-radius: 0.3em;
  box-decoration-break: clone;
  box-shadow:
    inset 0 -2px 0 color-mix(in srgb, var(--l05-coral) 58%, transparent),
    0 2px 7px color-mix(in srgb, var(--l05-gold) 14%, transparent);
  color: var(--bs-body-color);
  font-weight: 750;
  padding: 0.04em 0.2em;
  text-decoration: none;
  -webkit-box-decoration-break: clone;
}

#definition-planned-contrasts .bigger:has(.lecture-key-phrase) {
  font-size: 1em;
}

@keyframes l05-highlight-sweep {
  from { background-size: 0 100%; }
  to { background-size: 100% 100%; }
}

/* Equations, notes, figures, code, and tables get clear visual roles. */
#quarto-document-content .callout {
  border-radius: 13px;
  box-shadow: 0 4px 14px rgba(33, 42, 84, 0.06);
  overflow: hidden;
}

.lecture-prose-panel {
  background: color-mix(in srgb, var(--bs-body-bg) 94%, var(--l05-section-accent) 6%);
  border-left: 3px solid color-mix(in srgb, var(--l05-section-accent) 60%, transparent);
  border-radius: 0 11px 11px 0;
  margin: 0.85rem 0;
  padding: 0.7rem 0.85rem;
}

.lecture-method-intro,
.lecture-step-heading,
.lecture-reason-heading,
.lecture-takeaway,
.lecture-warning-heading {
  border-radius: 11px;
  margin: 1rem 0 0.65rem;
  padding: 0.62rem 0.78rem;
}

.lecture-method-intro,
.lecture-step-heading {
  background: color-mix(in srgb, var(--bs-body-bg) 88%, var(--l05-teal) 12%);
  border-left: 4px solid var(--l05-teal);
}

.lecture-reason-heading {
  background: color-mix(in srgb, var(--bs-body-bg) 89%, var(--l05-gold) 11%);
  border-left: 4px solid var(--l05-gold);
  font-weight: 700;
}

.lecture-takeaway {
  background: color-mix(in srgb, var(--bs-body-bg) 88%, var(--l05-green) 12%);
  border: 1px solid color-mix(in srgb, var(--l05-green) 30%, transparent);
  color: color-mix(in srgb, var(--bs-body-color) 85%, var(--l05-green) 15%);
  font-weight: 700;
}

.lecture-warning-heading {
  background: color-mix(in srgb, var(--bs-body-bg) 88%, var(--l05-coral) 12%);
  border-left: 4px solid var(--l05-coral);
  color: color-mix(in srgb, var(--bs-body-color) 82%, var(--l05-red) 18%);
  font-weight: 700;
}

#quarto-document-content .math.display {
  background: color-mix(in srgb, var(--bs-body-bg) 92%, var(--l05-section-accent) 8%);
  border: 1px solid color-mix(in srgb, var(--l05-section-accent) 20%, transparent);
  border-radius: 12px;
  display: block;
  margin: 1rem auto;
  overflow-x: auto;
  padding: 0.8rem 1rem;
}

#quarto-document-content .cell {
  border: 1px solid var(--l05-rule);
  border-radius: 13px;
  margin: 1rem 0;
  overflow: hidden;
}

#quarto-document-content .cell-output {
  background: color-mix(in srgb, var(--bs-body-bg) 94%, var(--l05-blue) 6%);
  border-top: 1px solid var(--l05-rule);
  padding: 0.55rem 0.75rem;
}

#quarto-document-content table {
  border: 1px solid var(--l05-rule);
  border-collapse: separate;
  border-radius: 12px;
  border-spacing: 0;
  box-shadow: 0 4px 14px rgba(33, 42, 84, 0.06);
  overflow: hidden;
}

#quarto-document-content table thead th {
  background: var(--l05-navy);
  color: #fff;
}

#quarto-document-content img,
#quarto-document-content svg {
  border-radius: 12px;
}

#quarto-document-content .columns {
  gap: 1rem;
}

/* Progressive enhancement: content stays visible without JavaScript. */
.lecture-effects-ready .lecture-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.lecture-effects-ready .lecture-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 760px) {
  .lecture-roadmap ol {
    grid-template-columns: 1fr;
  }

  #quarto-document-content section.level2 {
    border-left-width: 4px;
    border-radius: 14px;
    padding: 1rem;
  }

  #quarto-document-content > section.level1 > h1 {
    border-radius: 14px;
    font-size: 1.45rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .lecture-roadmap a,
  #quarto-document-content .lecture-key-phrase,
  .lecture-effects-ready .lecture-reveal {
    animation: none;
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media print {
  #lecture-reading-progress,
  .lecture-roadmap__cue {
    display: none;
  }

  .lecture-roadmap,
  #quarto-document-content section.level2 {
    box-shadow: none;
  }

  .lecture-effects-ready .lecture-reveal {
    opacity: 1;
    transform: none;
  }
}