:root {
  color-scheme: light;
  --ink: #17202a;
  --ink-soft: #4f5d6b;
  --paper: #fffdf9;
  --canvas: #f1eee7;
  --line: #d9d4c9;
  --navy: #173753;
  --navy-deep: #0c253a;
  --high: #125b9a;
  --mid: #9a5b13;
  --low: #5f6872;
  --further: #76518e;
  --high-soft: #eaf3fb;
  --mid-soft: #fbf1e5;
  --low-soft: #f0f2f4;
  --further-soft: #f4eef7;
  --focus: #0b70c9;
  --success: #1c713d;
  --warning: #a64518;
  --shadow: 0 16px 40px rgba(29, 42, 53, 0.08);
  --radius: 14px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1rem;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, rgba(18, 91, 154, 0.07), transparent 25rem),
    var(--canvas);
  font-size: 16px;
  line-height: 1.68;
}

a { color: #075f9f; text-underline-offset: 0.16em; }
a:hover { color: #003e6a; }

button,
input,
select { font: inherit; }

button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus), transparent 20%);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  left: 1rem;
  top: 1rem;
  transform: translateY(-180%);
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  color: white;
  background: var(--navy-deep);
}

.skip-link:focus { transform: translateY(0); }

.course-header {
  padding: 2.25rem max(1.25rem, calc((100vw - 1280px) / 2));
  color: white;
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.08), transparent 42%),
    var(--navy-deep);
  border-bottom: 5px solid #d5a43a;
}

.course-kicker,
.section-eyebrow {
  color: #f3c963;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.course-kicker a {
  color: inherit;
  text-underline-offset: 0.25em;
}

.lecture-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 3rem;
  margin-top: 1.3rem;
}

.lecture-number {
  color: #bcd3e7;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.lecture-heading h1 {
  max-width: 800px;
  margin: 0.25rem 0 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.25rem, 5vw, 4.6rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.04;
}

.lecture-dates {
  display: grid;
  min-width: 190px;
  margin: 0;
  gap: 0.7rem;
}

.lecture-dates div { display: grid; grid-template-columns: 1fr; }
.lecture-dates dt {
  color: #9eb8cd;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.lecture-dates dd { margin: 0; font-weight: 650; }

.lecture-map-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.4rem 1.25rem 1.3rem;
}

.lecture-map-shell .section-eyebrow { color: var(--mid); }
.lecture-map-shell h2 {
  margin: 0.2rem 0 0.1rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
}
.lecture-map-shell > p { margin: 0; color: var(--ink-soft); }

.lecture-map {
  display: grid;
  grid-template-columns: repeat(7, minmax(132px, 1fr));
  gap: 0.7rem;
  margin-top: 1.2rem;
}

.map-node {
  position: relative;
  display: flex;
  min-height: 132px;
  flex-direction: column;
  justify-content: space-between;
  padding: 1rem;
  border: 1px solid var(--line);
  border-top: 4px solid var(--node-color, var(--high));
  border-radius: 11px;
  color: var(--ink);
  background: rgba(255, 253, 249, 0.86);
  box-shadow: 0 8px 24px rgba(25, 40, 54, 0.05);
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.map-node:hover {
  color: var(--ink);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(25, 40, 54, 0.1);
}

.map-node strong { line-height: 1.2; }
.map-node span { color: var(--ink-soft); font-size: 0.78rem; line-height: 1.35; }
.map-node b { color: var(--node-color); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; }

.page-shell {
  display: grid;
  grid-template-columns: minmax(230px, 280px) minmax(0, 900px);
  align-items: start;
  justify-content: center;
  gap: 2rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.3rem 1.25rem 4rem;
}

.learning-sidebar {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
}

.learning-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.learning-panel > summary {
  display: none;
  padding: 0.85rem 1rem;
  cursor: pointer;
  font-weight: 800;
}

.learning-panel-body { padding: 1rem 1.1rem 1.2rem; }
.learning-panel-body section + section,
.learning-panel-body section + nav { margin-top: 1.4rem; padding-top: 1.2rem; border-top: 1px solid var(--line); }
.learning-panel h2 { margin: 0 0 0.7rem; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; }
.learning-panel ul,
.learning-panel ol { margin: 0; padding-left: 1.2rem; }
.learning-panel li { margin: 0.36rem 0; font-size: 0.84rem; line-height: 1.42; }
.learning-panel nav a { color: var(--ink-soft); text-decoration: none; }
.learning-panel nav a:hover,
.learning-panel nav a[aria-current="true"] { color: var(--high); text-decoration: underline; }

.segmented-control {
  display: grid;
  gap: 0.35rem;
}

.segmented-control button {
  min-height: 38px;
  padding: 0.44rem 0.7rem;
  border: 1px solid #bcc6ce;
  border-radius: 8px;
  color: var(--ink);
  background: white;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 700;
}

.segmented-control button[aria-pressed="true"] {
  border-color: var(--high);
  color: white;
  background: var(--high);
}

.control-note { margin: 0.65rem 0 0; color: var(--ink-soft); font-size: 0.78rem; line-height: 1.4; }

.lecture-content {
  min-width: 0;
  padding: clamp(1.3rem, 3vw, 3rem);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.lecture-content > h2 {
  margin: 4rem 0 1.2rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.75rem, 4vw, 2.55rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.lecture-content > h2:first-of-type { margin-top: 3rem; }
.lecture-content h3 { margin: 2.4rem 0 0.8rem; font-size: 1.45rem; line-height: 1.25; }
.lecture-content h4,
.lecture-content h5 { margin: 1.6rem 0 0.6rem; line-height: 1.3; }
.lecture-content p { max-width: 76ch; }
.lecture-content li { margin: 0.35rem 0; }
.lecture-content mjx-container[display="true"] {
  overflow-x: auto;
  overflow-y: hidden;
  margin: .6em 0 !important;
  padding: .15rem 0;
}

.priority-legend {
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #faf9f6;
}

.priority-legend h3 { margin: 0 0 0.7rem; font-size: 1rem; }
.priority-legend ul { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem 1.2rem; padding: 0; list-style: none; }
.priority-legend li { display: grid; grid-template-columns: 20px 64px 1fr; gap: 0.35rem; align-items: baseline; font-size: 0.82rem; }
.priority-legend li span:last-child { color: var(--ink-soft); }
.legend-mark.high { color: var(--high); }
.legend-mark.mid { color: var(--mid); }
.legend-mark.low { color: var(--low); }
.legend-mark.further { color: var(--further); }

.priority-block {
  margin: 1.4rem 0;
  scroll-margin-top: 1rem;
}

div.priority-block {
  padding: 1.15rem 1.25rem 1.3rem;
  border: 1px solid var(--line);
  border-left: 5px solid var(--priority-color);
  border-radius: 12px;
  background: var(--priority-soft);
}

.priority-block.highpriority { --priority-color: var(--high); --priority-soft: var(--high-soft); }
.priority-block.midpriority { --priority-color: var(--mid); --priority-soft: var(--mid-soft); }
.priority-block.lowpriority { --priority-color: var(--low); --priority-soft: var(--low-soft); }
.priority-block.furtherreading { --priority-color: var(--further); --priority-soft: var(--further-soft); }

.priority-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.8rem;
  margin-bottom: 0.8rem;
}

.priority-badge {
  color: var(--priority-color);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.priority-focus { font-weight: 700; }

details.priority-block {
  border: 1px solid var(--line);
  border-left: 5px solid var(--priority-color);
  border-radius: 12px;
  background: var(--priority-soft);
}

details.priority-block > summary {
  padding: 0.9rem 1rem;
  cursor: pointer;
  color: var(--priority-color);
  font-weight: 760;
}

.priority-details-body { padding: 0 1.2rem 1.2rem; }
.priority-symbol { display: inline-block; width: 1.25rem; }

.reading-hidden { display: none !important; }

.statement,
.proof {
  position: relative;
  margin: 1.1rem 0;
  padding: 1rem 1.05rem;
  border: 1px solid color-mix(in srgb, var(--priority-color, var(--navy)), #fff 58%);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.7);
}

.statement-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.65rem;
  margin-bottom: 0.55rem;
}

.statement-kind {
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.statement-title { font-weight: 750; }
.statement > :last-child,
.proof > :last-child { margin-bottom: 0; }
.proof-end { text-align: right; font-size: 1.2rem; }
.anchor-link { margin-left: auto; color: var(--ink-soft); text-decoration: none; opacity: 0.65; }

.instructor-note {
  margin: 1.2rem 0 0;
  border: 1px solid #b8c8d3;
  border-left: 3px solid var(--navy);
  border-radius: 8px;
  background: var(--paper);
  scroll-margin-top: 1.5rem;
}

.instructor-note > summary {
  padding: 0.85rem 1rem;
  color: var(--navy);
  cursor: pointer;
  list-style-position: inside;
}

.instructor-note > summary::marker { color: var(--navy); }
.instructor-note-title { font-weight: 800; }
.instructor-note-subtitle {
  display: block;
  margin: 0.2rem 0 0 1.1rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
}
.instructor-note[open] > summary { border-bottom: 1px solid var(--line); }
.instructor-note-body { padding: 0.25rem 1rem 0.9rem; }
.instructor-note-body > :last-child { margin-bottom: 0; }

.collapsible {
  margin: 4rem 0 1rem;
  border: 2px solid var(--navy);
  border-radius: 14px;
  background: #f8fbfd;
}

.collapsible > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.2rem;
  cursor: pointer;
  color: white;
  background: var(--navy);
  list-style-position: inside;
}

.collapsible-title {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
}

.collapsible-note { color: #c9dce9; font-size: 0.78rem; }
.collapsible-body { padding: 1rem 1.2rem 1.4rem; }

.exercise {
  position: relative;
  margin: 0.8rem 0;
  padding: 1rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.72);
}

.solution {
  margin-top: 1rem;
  border-top: 1px solid var(--line);
}

.solution > summary {
  padding: 0.75rem 0;
  cursor: pointer;
  color: var(--high);
  font-weight: 750;
}

.solution-body {
  padding: 0.2rem 0.85rem 0.5rem;
  border-left: 3px solid #a7bdd0;
  background: #f7fafc;
}

.exercise-toolbar {
  position: static;
  z-index: 4;
  top: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.7rem;
  margin: -0.2rem 0 1rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(248, 251, 253, 0.96);
  backdrop-filter: blur(7px);
}

.exercise-toolbar .segmented-control { display: flex; flex-wrap: wrap; }
.exercise-toolbar .action-button { padding: 0.45rem 0.75rem; border: 1px solid var(--high); border-radius: 8px; color: var(--high); background: white; cursor: pointer; font-weight: 750; }
.exercise-toolbar .action-button[aria-pressed="true"] { color: white; background: var(--high); }
.exercise-priority-hidden { display: none !important; }

.interactive-card {
  margin: 2rem 0 2.5rem;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid #b8c9d7;
  border-radius: 14px;
  background: linear-gradient(145deg, #fbfdff, #f1f6f9);
  box-shadow: 0 12px 28px rgba(24, 64, 94, 0.08);
}

.interactive-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.interactive-eyebrow { color: var(--high); font-size: 0.7rem; font-weight: 850; letter-spacing: 0.12em; text-transform: uppercase; }
.interactive-card h3 { margin: 0.15rem 0 0; font-size: 1.35rem; }
.reset-button,
.tab-button {
  padding: 0.42rem 0.7rem;
  border: 1px solid #aab8c3;
  border-radius: 8px;
  color: var(--ink);
  background: white;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 700;
}

.tab-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 1rem; }
.tab-button[aria-selected="true"] { border-color: var(--high); color: white; background: var(--high); }
.tab-panel[hidden] { display: none; }

.widget-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(190px, 0.8fr);
  gap: 1.1rem;
  align-items: start;
}

.plot-panel {
  min-width: 0;
  padding: 0.6rem;
  border: 1px solid #d6e0e7;
  border-radius: 10px;
  background: white;
}

.widget-controls {
  display: grid;
  gap: 0.8rem;
  padding: 0.9rem;
  border-radius: 10px;
  background: #e8f0f5;
}

.control-row { display: grid; gap: 0.25rem; }
.control-row label { font-size: 0.78rem; font-weight: 750; }
.control-row output { color: var(--navy); font-variant-numeric: tabular-nums; font-weight: 800; }
.control-row input[type="range"] { width: 100%; accent-color: var(--high); }
.checkbox-row { display: flex; align-items: center; gap: 0.5rem; font-size: 0.82rem; }
.checkbox-row input { accent-color: var(--high); }

.readout {
  padding: 0.75rem;
  border-left: 4px solid var(--high);
  border-radius: 7px;
  background: white;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.readout strong { color: var(--ink); }
.warning { border-left-color: var(--warning); color: #743314; background: #fff5ee; }
.success { border-left-color: var(--success); color: #175a32; background: #eff9f2; }

.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.55rem; }
.stat {
  padding: 0.65rem;
  border: 1px solid #d6e0e7;
  border-radius: 8px;
  background: white;
}
.stat span { display: block; color: var(--ink-soft); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; }
.stat strong { display: block; margin-top: 0.15rem; font-variant-numeric: tabular-nums; }

.chart {
  display: block;
  width: 100%;
  height: auto;
  min-height: 290px;
  overflow: visible;
}

.chart text { fill: var(--ink-soft); font-family: inherit; font-size: 11px; }
.chart .axis { stroke: #8796a3; stroke-width: 1; }
.chart .grid-line { stroke: #dfe6eb; stroke-width: 1; }
.chart .curve { fill: none; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.chart .point { stroke: white; stroke-width: 1.2; }
.chart .legend-label { font-size: 10px; }
.chart .draggable { cursor: grab; }
.chart .draggable:active { cursor: grabbing; }

.chart-legend { display: flex; flex-wrap: wrap; gap: 0.45rem 0.8rem; margin-top: 0.5rem; font-size: 0.74rem; }
.legend-key { display: inline-flex; align-items: center; gap: 0.28rem; }
.legend-key::before { width: 16px; height: 3px; border-radius: 3px; background: var(--legend-color); content: ""; }

.quick-checks { display: grid; gap: 0.7rem; margin-top: 1rem; }
.quick-check { padding: 0.8rem; border: 1px solid #d6e0e7; border-radius: 9px; background: white; }
.quick-check p { margin: 0 0 0.55rem; font-size: 0.84rem; font-weight: 700; }
.quick-check button { margin-right: 0.35rem; padding: 0.35rem 0.6rem; border: 1px solid #9eabb5; border-radius: 7px; background: white; cursor: pointer; }
.quick-check [role="status"] { margin-top: 0.45rem; color: var(--ink-soft); font-size: 0.78rem; }

.course-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem max(1.25rem, calc((100vw - 1280px) / 2));
  color: #cad9e4;
  background: var(--navy-deep);
  font-size: 0.8rem;
}

.course-footer p { margin: 0; }

.preface-shell {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 900px);
  align-items: start;
  justify-content: center;
  gap: 2rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.preface-nav {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--navy);
  box-shadow: var(--shadow);
  color: white;
}

.preface-nav .section-eyebrow { color: #f3c963; }
.preface-nav h2 { margin: 0.2rem 0; font-family: Georgia, "Times New Roman", serif; font-size: 1.6rem; }
.preface-nav p { margin: 0.4rem 0 1.1rem; color: #d8e4ec; font-size: 0.86rem; }
.preface-toc ul { list-style: none; margin: 1rem 0; padding: 0; counter-reset: preface-section; }
.preface-toc li { counter-increment: preface-section; margin: 0; }
.preface-toc a {
  display: grid;
  grid-template-columns: 1.2em 1fr;
  gap: 0.4rem;
  padding: 0.55rem 0;
  color: #fff;
  font-size: 0.88rem;
  line-height: 1.4;
  text-decoration: none;
}
.preface-toc a::before { content: counter(preface-section) "."; color: #f3c963; font-weight: 800; }
.preface-toc a:hover { text-decoration: underline; text-underline-offset: 0.2em; }
.preface-nav a:focus-visible { outline: 2px solid #f3c963; outline-offset: 3px; }
.preface-actions { display: grid; gap: 0.8rem; padding-top: 1rem; border-top: 1px solid #577184; font-size: 0.85rem; }
.preface-actions > a:not(.action-link) { color: #fff; text-underline-offset: 0.2em; }
.action-link {
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
  padding: 0.55rem 0.8rem;
  border-radius: 8px;
  background: white;
  color: var(--navy-deep);
  font-weight: 800;
  text-decoration: none;
}
.action-link:hover { color: var(--navy-deep); background: #eef5fa; }
.preface-content > h2 { margin-top: 2.8rem; padding-top: 1.6rem; border-top: 1px solid var(--line); scroll-margin-top: 1.5rem; }
.preface-content > h2:first-of-type { margin-top: 0.5rem; padding-top: 0; border-top: 0; }
.preface-content .priority-legend { margin: 2rem 0; }
.preface-content > dl > dt { color: var(--navy); font-weight: 750; }
.preface-content > dl > dd { margin-left: 1.25rem; }

#bibliography {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  font-weight: 500;
}

.csl-entry {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0.45rem;
  margin: 0.7rem 0;
  font-size: 0.88rem;
}

.csl-left-margin { color: var(--ink-soft); font-variant-numeric: tabular-nums; }

@media (max-width: 1120px) {
  .lecture-map { grid-template-columns: repeat(4, minmax(150px, 1fr)); }
  .page-shell { grid-template-columns: 1fr; max-width: 940px; }
  .learning-sidebar { position: static; max-height: none; }
  .learning-panel > summary { display: list-item; }
  .learning-panel:not([open]) .learning-panel-body { display: none; }
  .learning-panel-body { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
  .learning-panel-body section + section,
  .learning-panel-body section + nav { margin: 0; padding: 0; border: 0; }
  .preface-shell { grid-template-columns: 1fr; max-width: 940px; }
  .preface-nav { position: static; max-height: none; }
}

@media (max-width: 760px) {
  body { font-size: 15px; }
  .course-header { padding-top: 1.5rem; padding-bottom: 1.6rem; }
  .lecture-heading { display: grid; gap: 1.5rem; }
  .lecture-dates { grid-template-columns: 1fr 1fr; }
  .lecture-map { display: flex; padding-bottom: 0.5rem; overflow-x: auto; scroll-snap-type: x mandatory; }
  .map-node { min-width: 190px; scroll-snap-align: start; }
  .learning-panel-body { display: block; }
  .learning-panel-body section + section,
  .learning-panel-body section + nav { margin-top: 1.1rem; padding-top: 1rem; border-top: 1px solid var(--line); }
  .lecture-content { padding: 1.15rem; border-radius: 13px; }
  .priority-legend ul { grid-template-columns: 1fr; }
  .widget-grid { grid-template-columns: 1fr; }
  .interactive-header { display: grid; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .collapsible > summary { align-items: flex-start; flex-direction: column; }
  .course-footer { flex-direction: column; }
  .lecture-content mjx-container[display="true"] {
    max-width: 100%;
    padding-bottom: .15rem;
    overflow-x: auto;
    scrollbar-width: thin;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

@media print {
  body { color: black; background: white; font-size: 10.5pt; }
  .course-header { padding: 0 0 1rem; color: black; background: white; border-bottom: 2px solid black; }
  .course-kicker,
  .lecture-number,
  .lecture-dates dt,
  .lecture-dates dd { color: black; }
  .lecture-map-shell,
  .learning-sidebar,
  .interactive-card,
  .exercise-toolbar,
  .course-footer,
  .anchor-link { display: none !important; }
  .page-shell { display: block; max-width: none; padding: 0; }
  .preface-shell { display: block; max-width: none; padding: 0; }
  .preface-nav { display: none; }
  .preface-content h2, .preface-content h3 { break-after: avoid; }
  .lecture-content { border: 0; box-shadow: none; padding: 0; }
  .priority-block { break-inside: avoid; }
  details.priority-block,
  details.collapsible,
  details.instructor-note,
  details.solution { display: block; }
  details.priority-block > summary,
  details.collapsible > summary,
  details.instructor-note > summary,
  details.solution > summary { display: block; color: black; background: none; }
  details.priority-block:not([open]) > .priority-details-body,
  details.collapsible:not([open]) > .collapsible-body,
  details.instructor-note:not([open]) > .instructor-note-body,
  details.solution:not([open]) > .solution-body { display: block; }
  .instructor-note { border-color: black; background: white; }
  .instructor-note > summary { break-after: avoid; }
}

/* Progressive enhancement: canonical MathML is available without scripts. */
.math-tex { display: none; }
.math-pair.display { display: block; overflow-x: auto; margin: .75em 0; }
.math-native math { font-size: 1.08em; }
.math-native math[display="block"] { margin: 0; }
.math-ready .math-native { display: none; }
.math-ready .math-tex { display: inline; }
.math-ready .math-tex.display { display: block; }
.requires-js { display: none; }
.js-enabled .requires-js { display: flex; }
.js-enabled button.requires-js { display: inline-block; }
.source-anchor, .paragraph-heading { scroll-margin-top: 1.5rem; }
.source-anchor { display: inline; }
.practice-index { margin: 2rem 0; padding: 1.2rem; border: 1px solid var(--line); border-radius: 12px; }
.practice-index ol { padding-left: 1.5rem; }
.practice-tier { color: var(--muted); font-size: .85em; }
.course-navigation { display: flex; gap: 1rem; flex-wrap: wrap; }
.course-navigation a { color: inherit; }
.pilot-plots { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.pilot-plots svg { width: 100%; height: auto; }
.pilot-plots svg text { font-size: 12px; }
.pilot-controls { display: flex; flex-wrap: wrap; gap: 1rem 2rem; }
.pilot-controls > div { display: grid; grid-template-columns: minmax(0, 1fr) 5.5rem; gap: .4rem .8rem; flex: 1; }
.pilot-controls label:not(.sr-only) { grid-column: 1 / -1; font-weight: 700; }
.pilot-controls input[type=number] { width: 5.5rem; }
input[type=number], .answer-check input { padding: .45rem; border: 1px solid var(--line); border-radius: 5px; font: inherit; }
.source-preview { margin: 1rem 0; border: 1px solid var(--line); border-radius: 8px; padding: .7rem 1rem; }
.source-preview summary { font-weight: 700; cursor: pointer; }
.preview-body { padding-top: .5rem; }
.answer-check label { font-weight: 700; }
.answer-check p { margin: .5rem 0; }
.proof-toolbar { flex-wrap: wrap; gap: .4rem; padding: .8rem; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; }
.proof-toolbar p { flex-basis: 100%; margin: .3rem 0; }
.why-button { font: inherit; font-size: .85em; border: 1px solid var(--line); border-radius: 5px; padding: .25rem .5rem; background: white; cursor: pointer; }
.guided-current { outline: 2px solid var(--gold); outline-offset: 6px; background: #fff8e4; }
.guided-reason { border-left: 4px solid var(--mid); padding-left: .8rem; }
[aria-invalid="true"] { border-color: #a22 !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@media (max-width: 640px) {
  .pilot-plots { grid-template-columns: 1fr; }
  .pilot-controls { flex-direction: column; }
  .math-pair.display { max-width: 100%; }
  .exercise-toolbar { flex-wrap: wrap; }
}
@media print {
  .reading-hidden, .exercise-priority-hidden { display: block !important; }
  .requires-js, .source-preview, .answer-check, .proof-toolbar, .why-button, .practice-index, .course-navigation { display: none !important; }
  .guided-current { outline: 0; background: none; }
  .guided-reason { border: 0; padding: 0; }
  .priority-block { break-inside: auto; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
.range-number { width: 6rem; max-width: 100%; }
.source-segment { display: block; margin: .65rem 0; }
.related-practice { margin: -.3rem 0 .8rem; font-size: .85rem; }
.topic-practice-link { font-size: .85rem; font-weight: 600; }
@media print { .related-practice, .topic-practice-link { display: none; } }
.proof-toolbar .action-button, .preview-body .action-button { padding: .45rem .75rem; border: 1px solid var(--high); border-radius: 8px; color: var(--high); background: white; cursor: pointer; font: inherit; font-size: .85rem; font-weight: 700; }
.proof-toolbar .action-button:disabled { color: #67717b; border-color: #b8c0c8; background: #edf0f2; cursor: default; }
.pilot-plots svg { min-height: 0; }
.chart .draggable { touch-action: none; }
@media (max-width: 640px) {
  .lecture-content { padding: 1rem .6rem; }
  div.priority-block { padding-left: .75rem; padding-right: .75rem; }
  .interactive-card { padding: .8rem; }
  .pilot-plots svg text { font-size: 18px; }
}

.pilot-controls input[type=range] { min-width: 0; width: 100%; }

/* Semantic source roles: labels and weight carry meaning without color. */
.semantic-term { color: #173753; font-weight: 700; }
.semantic-condition { color: #8c3643; font-weight: 700; }
.quantity-a { color: #0b626b; }
.quantity-b { color: #703b72; }
.quick-recall { margin: .75rem 0; }
.recall-trigger, .recall-actions button, .discussion .action-button {
  font: inherit; font-size: .9rem; font-weight: 650; color: #173753;
  background: #f1f5f8; border: 1px solid #b9cbd8; border-radius: .5rem;
  padding: .5rem .8rem; cursor: pointer; text-align: left;
}
.recall-trigger::before { content: '↗ '; }
.recall-trigger[aria-expanded=true] { background: #e2edf4; }
.recall-panel {
  box-sizing: border-box; background: #fff; color: #243442;
  border: 1px solid #b9cbd8; border-radius: .7rem; padding: 1rem;
  width: 100%; margin: .6rem 0; max-height: min(34rem, calc(100dvh - 24px)); overflow: auto;
}
.recall-panel.recall-floating {
  position: fixed; inset: auto; width: min(26rem, calc(100vw - 24px)); margin: 0;
  box-shadow: 0 .5rem 2rem #17375326;
}
.recall-panel h4 { margin: 0; color: #173753; font-size: 1.05rem; }
.recall-panel .recall-tier { margin: .25rem 0 .6rem; color: #526675; font-size: .8rem; }
.recall-panel .preview-body { font-size: .95rem; }
.recall-panel .preview-body p:first-child { margin-top: 0; }
.recall-actions { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; margin-top: 1rem; }
.tangent-toggle { display: flex; align-items: center; gap: .5rem; }
.discussion { margin-top: 3rem; padding-top: 1.4rem; border-top: 2px solid var(--line); }
.discussion-status { color: #526675; }
.discussion-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem; }
.discussion-contact { font-size: 0.9rem; }
.discussion #disqus_thread { margin-top: 1.5rem; }
.discussion a:focus-visible, .discussion button:focus-visible { outline: 2px solid var(--navy); outline-offset: 3px; }
.discussion button:disabled { cursor: wait; }
@media print { .quick-recall, .recall-panel, .discussion { display: none !important; } }

.readout .quantity-a strong, .readout .quantity-b strong { color: inherit; }
#convex-chord-panel .control-row output { display: none; }

/* Lecture 2 uses the shared palette and disclosure conventions. */
.content-detail { margin: 1rem 0; border: 1px solid var(--border, #d8d2c8); border-left: 3px solid #44627c; border-radius: 7px; background: #faf8f3; }
.content-detail > summary { cursor: pointer; padding: .8rem 1rem; color: #17374f; font-weight: 650; }
.content-detail-body { padding: 0 1rem .6rem; }
.exercise-prompt { margin: 1.25rem 0; padding: .2rem 1rem; background: #f2f5f6; border-left: 3px solid #486b80; border-radius: 0 6px 6px 0; }
.exercise-prompt p:first-child { margin-bottom: .25rem; }
.exercise-prompt a { font-weight: 600; }
.numbered-equation { display: flex; align-items: center; gap: .6rem; max-width: 100%; }
.numbered-equation > p { flex: 1; min-width: 0; }
.equation-number { flex: none; font-variant-numeric: tabular-nums; }
.lecture-diagram { padding: 1rem; margin: 1.2rem 0; background: #faf8f3; border: 1px solid #ded8ce; border-radius: 8px; }
.lecture-diagram figcaption { color: #17374f; font-weight: 650; margin-bottom: .5rem; }
.diagram-source { font-size: .8rem; font-weight: 400; margin-left: .5rem; }
.lecture-diagram svg, .inverse-image svg { display: block; width: 100%; height: auto; }
.lecture-diagram text, .inverse-image svg text { fill: #17374f; font-family: inherit; font-size: 16px; }
.diagram-box { fill: #e8eef2; stroke: #58758a; stroke-width: 1.5; }
.diagram-arrow { fill: none; stroke: #58758a; stroke-width: 2; }
.inverse-image { margin: 1.2rem 0; padding: 1rem; border: 1px solid #ccd7df; border-radius: 8px; background: #f8fafb; }
.inverse-image h4 { margin: 0 0 .5rem; color: #17374f; }
.inverse-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: .75rem 0; }
.inverse-control label { display: block; font-weight: 600; margin-bottom: .25rem; }
.inverse-control input[type=range] { width: 100%; accent-color: #254e69; }
.inverse-control input[type=number] { width: 5rem; padding: .35rem; border: 1px solid #788b97; border-radius: 4px; background: white; }
.inverse-interval { fill: #e3d29c; fill-opacity: .5; stroke: #82691f; stroke-width: 2; stroke-dasharray: 5 3; }
.inverse-selected circle { fill: #244f6a; stroke: #17374f; stroke-width: 2; }
.inverse-selected .inverse-node-label { fill: #fff; }
.inverse-membership { fill: #17374f; }
.inverse-unselected circle { fill: white; stroke: #8b99a3; stroke-width: 1.5; }
.inverse-edge { fill: none; stroke: #8596a3; stroke-width: 1; stroke-dasharray: 4 4; }
.inverse-selected .inverse-edge { stroke: #244f6a; stroke-width: 2.5; stroke-dasharray: none; }
.inverse-readout { font-weight: 650; color: #17374f; min-height: 1.6em; }
.inverse-error { color: #a22626; min-height: 1.5em; margin: .25rem 0; }
.inverse-image [aria-invalid=true] { outline: 2px solid #a22626; }
.js-enabled .inverse-static { display: none; }
.js-enabled .inverse-live.requires-js { display: block; }
.inverse-image svg.inverse-svg-compact { display: none; }
.inverse-legend { margin: 0 0 .5rem; font-size: .9rem; }
.inverse-image button { border: 1px solid #254e69; border-radius: 5px; background: #254e69; color: white; padding: .4rem .85rem; font: inherit; cursor: pointer; }
.inverse-image button:hover { background: #17374f; }
.inverse-image :focus-visible { outline: 3px solid #987421; outline-offset: 3px; }
@media (max-width: 640px) {
  .inverse-controls { grid-template-columns: 1fr; }
  .lecture-diagram { overflow-x: auto; }
  .lecture-diagram svg { min-width: 540px; }
  .inverse-image { padding: .65rem; }
  .inverse-image svg.inverse-svg-wide { display: none; }
  .inverse-image svg.inverse-svg-compact { display: block; }
}
@media print {
  .content-detail-body { display: block !important; }
  .content-detail { break-inside: auto; }
  .exercise-prompt { break-inside: avoid; }
  .inverse-live { display: none !important; }
  .inverse-static, .js-enabled .inverse-static { display: block !important; }
  .lecture-diagram { break-inside: avoid; }
}

/* Classroom reading plans: source prose stays complete in the LaTeX/PDF. */
body[data-lecture="2"] .math-with-punctuation { white-space: nowrap; }
:is(body[data-lecture="2"], body[data-lecture="3"], body[data-lecture="4"]) .classroom-points {
  margin: .85rem 0 1.3rem;
}
:is(body[data-lecture="2"], body[data-lecture="3"], body[data-lecture="4"]) .classroom-points > ul {
  margin: 0;
  padding-left: 1.35rem;
  list-style-type: disc;
}
:is(body[data-lecture="2"], body[data-lecture="3"], body[data-lecture="4"]) .classroom-points > ul > li {
  margin: .65rem 0;
  padding-left: .25rem;
}
:is(body[data-lecture="2"], body[data-lecture="3"], body[data-lecture="4"]) .classroom-points > ul > li::marker { color: #173753; }
:is(body[data-lecture="2"], body[data-lecture="3"], body[data-lecture="4"]) .classroom-points > ul > li > p { margin: .3rem 0; }
:is(body[data-lecture="2"], body[data-lecture="3"], body[data-lecture="4"]) .classroom-points > ul > li > p:first-child > strong:first-child,
:is(body[data-lecture="2"], body[data-lecture="3"], body[data-lecture="4"]) .classroom-points > ul > li > strong:first-child { color: #173753; }
.term-help-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .45rem .7rem;
  margin: .9rem 0 1.2rem;
  font-size: .9rem;
}
.term-help-label { color: #526071; font-size: .8rem; font-weight: 700; }
.term-help-entry { display: block; max-width: 100%; }
.term-help-row .quick-recall { margin: 0; }
.term-help-row .recall-trigger {
  padding: .35rem .6rem;
  min-height: 44px;
  border: 1px solid #bac8d4;
  border-radius: .4rem;
  background: #f3f7fa;
  color: #173753;
  font-size: .9rem;
  font-weight: 650;
}
.term-help-row .recall-trigger:hover { background: #e5edf3; }
.term-help-row .recall-trigger:focus-visible { outline: 3px solid #b98b32; outline-offset: 3px; }
.term-help-row .recall-panel { font-size: 1rem; }
@media (max-width: 600px) {
  .term-help-entry:has(.recall-trigger[aria-expanded="true"]) { flex-basis: 100%; }
  .term-help-row .recall-panel { width: 100%; box-sizing: border-box; }
}
@media print {
  .term-help-row { display: none !important; }
  .classroom-points li { break-inside: avoid; }
}

/* Lecture 3 figures retain the prepared artwork and full source captions. */
.source-figure { margin: 1.4rem 0; padding: .85rem; border: 1px solid #ded8ce; border-radius: .5rem; background: #fffdf8; }
.source-figure figcaption { color: #173753; font-weight: 650; margin-bottom: .65rem; }
.source-figure img { display: block; width: 100%; height: auto; }
.source-figure .figure-panels { display: none; }
body[data-lecture="3"] .integration-step { border-left: 3px solid #527895; }
.explanation-row { border-left-color: #0b626b; }
.explanation-row .term-help-label { color: #0b626b; }
.explanation-row .recall-trigger::before { content: '? '; }
.terminology-notes { margin-top: 2rem; }
@media (max-width: 650px) {
  .source-figure { padding: .6rem; margin-inline: 0; }
  .source-figure .figure-drawing:has(+ .figure-panels) { display: none; }
  .source-figure .figure-panels { display: grid; gap: 1.1rem; }
  .source-figure .figure-panels img { min-width: 0; }
}
@media print {
  .source-figure { break-inside: avoid; border-color: #bbb; }
  .source-figure .figure-drawing { display: block !important; }
  .source-figure .figure-panels { display: none !important; }
}
.spike-panels { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); }
.spike-panels svg { width: 100%; height: auto; }
.figure-note { font-size: .85rem; color: #526071; margin-bottom: 0; }
@media (max-width: 650px) { .spike-panels { grid-template-columns: 1fr; } }

/* Lecture 4: source illustrations and the selected quadratic chord. */
.lecture4-panels { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: .8rem; }
.lecture4-panels img { min-width: 0; max-width: 440px; justify-self: center; }
.chord-static { max-width: 540px; margin-inline: auto; }
.chord-explorer svg { display: block; width: 100%; height: auto; }
.chord-live svg { touch-action: none; }
.chord-live [data-chord-endpoint] { cursor: ew-resize; }
.chord-explorer[data-mounted="true"] .chord-static { display: none; }
.js-enabled .chord-live { display: none; }
.js-enabled .chord-explorer[data-mounted="true"] .chord-live { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(210px, 1fr); gap: 1rem; align-items: start; }
.chord-control { display: grid; grid-template-columns: 1fr 5.5rem; gap: .4rem; margin: .65rem 0; }
.chord-control label { grid-column: 1 / -1; font-weight: 650; }
.chord-control input { min-width: 0; width: 100%; }
.chord-control input[type="number"] { padding: .35rem; border: 1px solid #aab8c3; border-radius: .25rem; }
.chord-control [aria-invalid="true"] { outline: 2px solid #a33; }
.chord-error { color: #8a2929; font-size: .85rem; }
[data-chord-readout] { grid-column: 1 / -1; }
.chord-readout { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: .3rem; }
.chord-readout > div { flex: 1 1 180px; }
.chord-readout dt { font-size: .9rem; }
.chord-readout dd { margin: .3rem 0; font-weight: 700; font-size: 1.25rem; color: #173753; }
@media (max-width: 700px) {
  .js-enabled .chord-explorer[data-mounted="true"] .chord-live { grid-template-columns: minmax(0, 1fr); }
}
@media print {
  .chord-explorer { display: block !important; box-shadow: none; break-inside: avoid; }
  .chord-explorer .chord-static { display: block !important; }
  .chord-explorer .chord-live { display: none !important; }
  .lecture4-panels { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
}

body[data-lecture="4"] .numbered-equation { margin: .5rem 0; }
body[data-lecture="4"] .numbered-equation > p { margin: 0; }
body[data-lecture="4"] .numbered-equation .math-pair.display { margin: 0; }
@media (max-width: 640px) {
  body[data-lecture="4"] .exercises-shell .collapsible-body,
  body[data-lecture="4"] .exercises-shell .priority-details-body { padding-inline: .35rem; }
  body[data-lecture="4"] .exercises-shell div.priority-block { padding-inline: .4rem; }
  body[data-lecture="4"] .exercises-shell .exercise { padding: .5rem; }
  body[data-lecture="4"] .exercises-shell .solution-body { padding-inline: .4rem; }
  body[data-lecture="4"] .solution-body .lecture4-figure { padding: .25rem; margin-inline: -.25rem; }
}

/* Survival-area proof: retain the source default in print and without scripts. */
.markov-explorer svg { display: block; width: 100%; height: auto; }
.markov-static { max-width: 520px; margin-inline: auto; }
.markov-explorer[data-mounted="true"] .markov-static { display: none; }
.js-enabled .markov-live { display: none; }
.js-enabled .markov-explorer[data-mounted="true"] .markov-live { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(180px, 1fr); gap: 1rem; align-items: center; }
.markov-controls { display: grid; grid-template-columns: 1fr 5.5rem; gap: .5rem; }
.markov-controls > label:not(.sr-only), .markov-controls > p, .markov-controls > button { grid-column: 1 / -1; }
.markov-controls > label { font-weight: 650; }
.markov-controls input { min-width: 0; width: 100%; }
.markov-controls input[type="number"] { padding: .35rem; border: 1px solid #aab8c3; border-radius: .25rem; }
.markov-controls [aria-invalid="true"] { outline: 2px solid #a33; }
.markov-error { color: #8a2929; font-size: .85rem; }
.markov-error:empty { display: none; }
[data-markov-readout] { grid-column: 1 / -1; }
.markov-readout { display: flex; gap: 1rem; flex-wrap: wrap; }
.markov-readout > div { flex: 1 1 170px; }
.markov-readout dt { font-size: .88rem; }
.markov-readout dd { margin: .35rem 0 0; font-weight: 700; font-size: 1.15rem; color: #173753; }
.markov-area-key,.markov-rectangle-key { display: inline-block; margin-right: .25em; width: .8em; height: .8em; border: 1px solid #0b626b; background: #dbeaf0; }
.markov-rectangle-key { border: 2px solid #94651c; background: #f1d598; }
@media (max-width: 700px) {
 .js-enabled .markov-explorer[data-mounted="true"] .markov-live { grid-template-columns: minmax(0,1fr); }
}
@media print {
 .markov-explorer { display: block !important; box-shadow: none; break-inside: avoid; }
 .markov-explorer .markov-static { display: block !important; }
.markov-explorer .markov-live { display: none !important; }
}

/* Lecture 5 activities share the reading surface and keep useful static views. */
.lecture5-explorer { margin: 1.1rem 0; padding: 1rem; border: 1px solid #cad5d7; border-radius: .5rem; background: #fbfaf6; }
.lecture5-explorer h4 { margin: 0 0 .7rem; color: #18384e; font-size: 1.1rem; }
.l5-panels { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .7rem; }
.l5-panels.l5-single { grid-template-columns: minmax(0,1fr); }
.l5-panel { min-width: 0; }
.l5-panel-caption { margin: 0; min-height: 2.7em; font-size: .85rem; font-weight: 600; }
.lecture5-explorer svg, .lecture5-figure svg { display: block; width: 100%; height: auto; }
.l5-live { display: none; }
.lecture5-explorer[data-mounted="true"] .l5-live { display: block; }
.lecture5-explorer[data-mounted="true"] .l5-static { display: none; }
.l5-controls { display: flex; flex-wrap: wrap; align-items: center; gap: .7rem; margin-top: .7rem; }
.l5-control { display: grid; grid-template-columns: minmax(0,1fr) 5.5rem; gap: .4rem .8rem; width: 100%; }
.l5-control label:not(.sr-only) { grid-column: 1 / -1; font-weight: 650; }
.l5-control input { min-width: 0; width: 100%; }
.l5-control input[type="number"] { padding: .4rem; border: 1px solid #aab8c3; border-radius: .25rem; background: white; }
.l5-control [aria-invalid="true"] { outline: 2px solid #923a38; }
.l5-extra { width: 100%; }
.l5-extra summary { cursor: pointer; font-weight: 600; }
.l5-choices { display: flex; flex-wrap: wrap; gap: .4rem; }
.l5-choices button { padding: .5rem .75rem; border: 1px solid #aab8c3; border-radius: .3rem; background: white; color: #18384e; cursor: pointer; }
.l5-choices button[aria-pressed="true"] { background: #18384e; color: white; border-color: #18384e; }
.lecture5-explorer button:focus-visible,.lecture5-explorer input:focus-visible { outline: 3px solid #b77b18; outline-offset: 3px; }
.l5-readout { display: flex; flex-wrap: wrap; gap: .8rem; margin: 1rem 0 .5rem; }
.l5-readout > div { flex: 1 1 130px; }
.l5-readout dt { font-size: .86rem; }
.l5-readout dd { margin: .2rem 0; font-size: 1.17rem; font-weight: 700; color: #18384e; }
.l5-small,.l5-explanation-link { font-size: .86rem; margin: .6rem 0 0; }
.l5-error { color: #923a38; font-size: .9rem; }
.l5-error:empty { display: none; }
.l5-table-scroll { max-width: 100%; overflow-x: auto; }
.l5-values { width: 100%; font-size: .82rem; border-collapse: collapse; margin: .8rem 0; }
.l5-values caption { text-align: left; font-weight: 650; }
.l5-values th,.l5-values td { padding: .35rem; text-align: center; border-bottom: 1px solid #d6dedc; }
.l5-values th:first-child { text-align: left; }
.l5-loss-bar { display: flex; background: #eceee9; height: 14px; border-radius: 3px; overflow: hidden; }
.l5-noise { background: #087e83; }.l5-excess { background: #85456d; }
body[data-lecture="5"] .numbered-equation { margin: .5rem 0; }
body[data-lecture="5"] .numbered-equation > p, body[data-lecture="5"] .numbered-equation .math-pair.display { margin: 0; }
@media (max-width: 700px) {
  .l5-panels { grid-template-columns: minmax(0,1fr); }
  .lecture5-explorer { padding: .55rem; }
  .l5-panel-caption { min-height: 0; }
  body[data-lecture="5"] .exercises-shell .collapsible-body,body[data-lecture="5"] .exercises-shell .priority-details-body { padding-inline: .35rem; }
  body[data-lecture="5"] .exercises-shell .exercise,body[data-lecture="5"] .exercises-shell .solution-body { padding: .45rem; }
  /* Long inline identities remain readable without widening the page. */
  body[data-lecture="5"] .math-pair.inline {
    display: inline-block;
    max-width: 100%;
    overflow-x: auto;
    vertical-align: middle;
    padding-block: .1em;
  }
}
@media print {
  .lecture5-explorer .l5-live { display: none !important; }
  .lecture5-explorer .l5-static { display: block !important; }
  .l5-panels { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .l5-panel { break-inside: avoid; }
  .lecture5-explorer { box-shadow: none; }
}

/* Lecture 6: source-linked experiments and mixed-priority reference rows. */
.lecture6-explorer { margin: 1.4rem 0; padding: 1rem; border: 1px solid #ced8d9; border-radius: .5rem; background: #fffdf8; }
.lecture6-explorer h3 { margin: 0 0 .8rem; font-size: 1.2rem; }
.lecture6-explorer svg { display: block; width: 100%; max-width: 540px; height: auto; margin: auto; }
.l6-panels { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .7rem; }
.l6-live { display: none; }.lecture6-explorer[data-mounted="true"] .l6-live { display: block; }.lecture6-explorer[data-mounted="true"] .l6-static { display: none; }
.l6-controls { display: none; flex-wrap: wrap; align-items: center; gap: .7rem; margin-top: .7rem; }
.js-enabled .l6-controls { display: flex; }
.lecture6-explorer .action-button { padding: .45rem .8rem; border: 1px solid #aab8c3; border-radius: .3rem; background: white; color: #18384e; cursor: pointer; font: inherit; }
.lecture6-explorer button:focus-visible,.lecture6-explorer input:focus-visible,.lecture6-explorer select:focus-visible { outline: 3px solid #b77b18; outline-offset: 3px; }
.l6-control { display: grid; grid-template-columns: minmax(0,1fr) 6.5rem; gap: .4rem .8rem; width: 100%; }
.l6-control label:not(.sr-only) { grid-column: 1 / -1; font-weight: 650; }
.l6-control input,.l6-control select { min-width: 0; width: 100%; }
.l6-control input[type="number"],.l6-control select { padding: .45rem; border: 1px solid #aab8c3; border-radius: .25rem; background: white; }
.l6-control [aria-invalid="true"] { outline: 2px solid #923a38; }
.l6-readout { display: flex; flex-wrap: wrap; gap: .8rem; margin: .8rem 0; }
.l6-readout > div { flex: 1 1 140px; }.l6-readout dt { font-size: .85rem; }.l6-readout dd { margin: .2rem 0; font-size: 1.08rem; font-weight: 700; color: #18384e; }
.l6-small { font-size: .86rem; margin: .6rem 0 0; }.l6-error { color: #923a38; }.l6-error:empty { display: none; }
.l6-strings { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; list-style: none; }.l6-strings li { display: grid; text-align: center; padding: .4rem .7rem; border: 1px solid #ced8d9; border-radius: .3rem; }
.lecture6-figure img { display: block; width: 100%; max-width: 500px; margin: auto; }
.lecture6-summary-wrap { max-width: 100%; overflow-x: auto; }.lecture6-summary { width: 100%; border-collapse: collapse; font-size: .94rem; }.lecture6-summary th,.lecture6-summary td { text-align: left; padding: .7rem .55rem; vertical-align: top; border-bottom: 1px solid #d6dedc; }.lecture6-summary th { color: #18384e; background: #eef2ef; }.lecture6-summary td:first-child { min-width: 9rem; font-weight: 600; }.lecture6-summary td:last-child { white-space: nowrap; }
@media screen and (max-width: 650px) { .l6-panels { grid-template-columns: minmax(0,1fr); }.lecture6-explorer { padding: .6rem; }.lecture6-summary thead { display: none; }.lecture6-summary,.lecture6-summary tbody,.lecture6-summary tr,.lecture6-summary td { display: block; width: auto; }.lecture6-summary tr { border-bottom: 1px solid #aab8c3; padding: .4rem 0; }.lecture6-summary td { border: 0; padding: .3rem .15rem; }.lecture6-summary td:last-child::before { content: 'Priority: '; font-weight: 600; }.lecture6-summary tr[hidden] { display: none; } }
@media print { .lecture6-explorer .l6-live { display: none !important; }.lecture6-explorer .l6-static { display: block !important; }.l6-controls,.l6-error { display: none !important; }.l6-panels { grid-template-columns: repeat(2,minmax(0,1fr)); }.lecture6-summary tr[hidden] { display: table-row !important; }.lecture6-summary-wrap { overflow: visible; }.lecture6-summary thead { display: table-header-group; }.lecture6-summary tr { break-inside: avoid; }.lecture6-explorer svg { break-inside: avoid; } }

/* Lecture 7: source-linked experiments and mixed-priority reference rows. */
.lecture7-explorer { margin: 1.4rem 0; padding: 1rem; border: 1px solid #ced8d9; border-radius: .5rem; background: #fffdf8; }
.lecture7-explorer h3 { margin: 0 0 .8rem; font-size: 1.2rem; }
.lecture7-explorer svg { display: block; width: 100%; max-width: 540px; height: auto; margin: auto; }
.l7-panels { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .7rem; }
.l7-live { display: none; }.lecture7-explorer[data-mounted="true"] .l7-live { display: block; }.lecture7-explorer[data-mounted="true"] .l7-static { display: none; }
.l7-controls { display: none; flex-wrap: wrap; align-items: center; gap: .7rem; margin-top: .7rem; }
.js-enabled .l7-controls { display: flex; }
.lecture7-explorer .action-button { padding: .45rem .8rem; border: 1px solid #aab8c3; border-radius: .3rem; background: white; color: #18384e; cursor: pointer; font: inherit; }
.lecture7-explorer button:focus-visible,.lecture7-explorer input:focus-visible,.lecture7-explorer select:focus-visible { outline: 3px solid #b77b18; outline-offset: 3px; }
.l7-control { display: grid; grid-template-columns: minmax(0,1fr) 6.5rem; gap: .4rem .8rem; width: 100%; }
.l7-control label:not(.sr-only) { grid-column: 1 / -1; font-weight: 650; }
.l7-control input,.l7-control select { min-width: 0; width: 100%; }
.l7-control input[type="number"],.l7-control select { padding: .45rem; border: 1px solid #aab8c3; border-radius: .25rem; background: white; }
.l7-control [aria-invalid="true"] { outline: 2px solid #923a38; }
.l7-readout { display: flex; flex-wrap: wrap; gap: .8rem; margin: .8rem 0; }
.l7-readout > div { flex: 1 1 140px; }.l7-readout dt { font-size: .85rem; }.l7-readout dd { margin: .2rem 0; font-size: 1.08rem; font-weight: 700; color: #18384e; }
.l7-small { font-size: .86rem; margin: .6rem 0 0; }.l7-error { color: #923a38; }.l7-error:empty { display: none; }
.l7-strings { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; list-style: none; }.l7-strings li { display: grid; text-align: center; padding: .4rem .7rem; border: 1px solid #ced8d9; border-radius: .3rem; }
.lecture7-figure img { display: block; width: 100%; max-width: 500px; margin: auto; }
.lecture7-summary-wrap { max-width: 100%; overflow-x: auto; }.lecture7-summary { width: 100%; border-collapse: collapse; font-size: .94rem; }.lecture7-summary th,.lecture7-summary td { text-align: left; padding: .7rem .55rem; vertical-align: top; border-bottom: 1px solid #d6dedc; }.lecture7-summary th { color: #18384e; background: #eef2ef; }.lecture7-summary td:first-child { min-width: 9rem; font-weight: 600; }.lecture7-summary td:last-child { white-space: nowrap; }
@media screen and (max-width: 650px) { .l7-panels { grid-template-columns: minmax(0,1fr); }.lecture7-explorer { padding: .6rem; }.lecture7-summary thead { display: none; }.lecture7-summary,.lecture7-summary tbody,.lecture7-summary tr,.lecture7-summary td { display: block; width: auto; }.lecture7-summary tr { border-bottom: 1px solid #aab8c3; padding: .4rem 0; }.lecture7-summary td { border: 0; padding: .3rem .15rem; }.lecture7-summary td:last-child::before { content: 'Priority: '; font-weight: 600; }.lecture7-summary tr[hidden] { display: none; } }
@media print { .lecture7-explorer .l7-live { display: none !important; }.lecture7-explorer .l7-static { display: block !important; }.l7-controls,.l7-error { display: none !important; }.l7-panels { grid-template-columns: repeat(2,minmax(0,1fr)); }.lecture7-summary tr[hidden] { display: table-row !important; }.lecture7-summary-wrap { overflow: visible; }.lecture7-summary thead { display: table-header-group; }.lecture7-summary tr { break-inside: avoid; }.lecture7-explorer svg { break-inside: avoid; } }

.js-enabled .l7-controls { display: grid; grid-template-columns: minmax(0,1fr) 6rem auto; }
.l7-controls > label:not(.sr-only) { grid-column: 1 / -1; font-weight: 650; }
.l7-controls input { width: 100%; min-width: 0; }
.l7-controls input[type="number"] { padding: .45rem; border: 1px solid #aab8c3; border-radius: .25rem; }
.l7-controls [aria-invalid="true"] { outline: 2px solid #923a38; }
.l7-legend { display: flex; flex-wrap: wrap; gap: .3rem 1.2rem; font-size: .86rem; }
.lecture7-figure svg { width: 100%; max-width: 560px; height: auto; display: block; margin: auto; }
@media (max-width:650px) { .l7-controls { grid-template-columns: minmax(0,1fr) 5rem; }.l7-controls button { grid-column:1/-1; justify-self:start; } }

/* Lecture 8: fixed mathematical examples, with print/no-script fallbacks. */
.lecture8-explorer { margin:1.3rem 0; padding:1.1rem; border:1px solid var(--line); border-radius:12px; background:var(--paper); }
.lecture8-explorer h3 { margin-top:0; }
.l8-panels { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); align-items:center; gap:.8rem; }
.l8-panels svg,.lecture8-figure svg { display:block; width:100%; height:auto; }
.lecture8-figure { margin:1.2rem 0; padding:1rem; border:1px solid var(--line); border-radius:10px; }
.lecture8-figure > svg { max-width:650px; margin:auto; }
.l8-controls { display:flex; align-items:center; gap:.6rem; flex-wrap:wrap; margin:.8rem 0; }
.l8-controls input[type=range] { flex:1 1 150px; min-width:100px; }
.l8-controls input[type=number] { width:5rem; }
.l8-controls input,.l8-controls select { font:inherit; padding:.3rem; max-width:100%; }
.l8-readout { display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:.6rem; margin:.7rem 0; }
.l8-readout div { padding:.5rem .7rem; border-left:3px solid #087e83; background:#f1f5f1; }
.l8-readout dt { font-size:.84em; }.l8-readout dd { margin:.2rem 0 0; font-weight:650; }
.l8-small { font-size:.91em; }.l8-error { color:#842834; min-height:1.3em; font-size:.9em; }
.l8-live { display:none; }.js-enabled .lecture8-explorer[data-mounted=true] .l8-live { display:block; }.js-enabled .lecture8-explorer[data-mounted=true] .l8-static { display:none; }
.l8-matrix-wrap { overflow-x:auto; }.l8-matrix { width:100%; border-collapse:collapse; font-size:.82em; }.l8-matrix td,.l8-matrix th { text-align:center; padding:.35rem; border:1px solid #d3dbd8; }.l8-matrix caption { margin-bottom:.6rem; }.l8-matrix .l8-edge { font-weight:700; }.l8-matrix .l8-within { background:#e1f0ed; }.l8-matrix .l8-between { background:#f4e6ef; }
@media(max-width:720px) { .l8-panels { grid-template-columns:1fr; }.lecture8-explorer { padding:.7rem; } }
@media print { .l8-live { display:none!important; }.l8-static { display:block!important; }.lecture8-explorer,.lecture8-figure { break-inside:avoid; } }
body[data-lecture="8"] .classroom-points > ul { padding-left:1.25rem; }
body[data-lecture="8"] .classroom-points > ul > li { margin:.55rem 0; padding-left:.15rem; }
body[data-lecture="8"] .classroom-points > ul > li::marker { color:#173753; }
body[data-lecture="8"] .classroom-points > ul > li > strong:first-child { color:#173753; }
body[data-lecture="8"] .numbered-equation { margin:.5rem 0; }
body[data-lecture="8"] .numbered-equation > p,body[data-lecture="8"] .numbered-equation .math-pair.display { margin:0; }
.l8-error:empty { display:none; }
.l8-table-scroll { max-width:100%; overflow-x:auto; }
.l8-token-table { width:100%; border-collapse:collapse; font-size:.94em; }
.l8-token-table th,.l8-token-table td { padding:.65rem .5rem; text-align:left; border-bottom:1px solid #ced8d9; }
.l8-token-table th { background:#eef2ef; color:#18384e; }
.lecture8-explorer .action-button { font:inherit; padding:.4rem .8rem; border:1px solid #aab8c3; border-radius:.3rem; background:white; color:#18384e; cursor:pointer; }
.lecture8-explorer :is(button,input,select):focus-visible,.l8-table-scroll:focus-visible { outline:3px solid #b77b18; outline-offset:3px; }
.lecture8-explorer [aria-invalid=true] { outline:2px solid #923a38; }
@media(max-width:700px) { body[data-lecture="8"] .math-pair.inline { display:inline-block; max-width:100%; overflow-x:auto; vertical-align:middle; padding-block:.1em; } }

/* Lecture 9: exact tail areas and source-linked diagrams. */
.lecture9-explorer,.lecture9-figure { margin:1rem 0; padding:1rem; border:1px solid #bdcfcf; border-radius:12px; background:#fffdf8; }
.lecture9-explorer h3 { margin:.2rem 0 .6rem; }
.l9-panels { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:1rem; }
.l9-panels svg,.lecture9-figure > svg { width:100%; height:auto; display:block; }
.l9-controls { display:flex; flex-wrap:wrap; align-items:end; gap:1rem; margin:.8rem 0; }
.l9-controls > div { display:grid; grid-template-columns:minmax(100px,1fr) 5.5rem; flex:1 1 250px; gap:.4rem; }
.l9-controls label:not(.sr-only) { grid-column:1/-1; font-weight:650; }
.l9-controls input { min-width:0; width:100%; box-sizing:border-box; }
.l9-controls input[type=number] { padding:.5rem; border:1px solid #8da5ad; border-radius:6px; font:inherit; }
.l9-readout { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:.5rem; margin:.6rem 0; }
.l9-readout > div { padding:.65rem; border:1px solid #d9dfdb; border-radius:8px; }
.l9-readout dt { font-size:.88em; } .l9-readout dd { margin:.2rem 0 0; font-weight:700; font-size:1.15em; }
.l9-small { font-size:.9em; line-height:1.5; } .l9-error { color:#8b2929; }
.l9-live { display:none; } .lecture9-explorer[data-mounted=true] .l9-live { display:block; }
.lecture9-explorer[data-mounted=true] .l9-static { display:none; }
@media(max-width:760px) { .l9-panels { grid-template-columns:1fr; } .l9-readout { grid-template-columns:1fr; } }
@media print { .l9-live { display:none!important; } .l9-static { display:block!important; } .lecture9-explorer,.lecture9-figure { break-inside:avoid; } }
@media(max-width:700px) {
  body[data-lecture="9"] .math-pair.inline { display:inline-block; max-width:100%; overflow-x:auto; vertical-align:middle; padding-block:.1em; }
}
@media(max-width:760px) {
  .l9-panels svg text:not([font-size]), .lecture9-figure > svg text:not([font-size]):not([font-weight]) { font-size:22px; }
  .l9-panels svg text[font-size="15"], .l9-panels svg text[font-size="16"] { font-size:20px; }
}

/* Lecture 10: exact sum distribution, with progressive enhancement. */
.lecture10-explorer,.lecture10-figure { margin:1.1rem 0; padding:1rem; border:1px solid #bdcfcf; border-radius:12px; background:#fffdf8; }
.lecture10-explorer h3 { margin:.2rem 0 .6rem; }
.lecture10-explorer svg,.lecture10-figure svg { width:100%; height:auto; display:block; max-width:740px; margin:auto; }
.l10-panels { display:grid; grid-template-columns:1fr; gap:.8rem; }
.l10-controls { display:flex; flex-wrap:wrap; align-items:center; gap:.6rem; margin:1rem 0; }
.l10-controls label:not(.sr-only) { font-weight:650; }
.l10-controls input[type=range] { flex:1 1 160px; min-width:100px; }
.l10-controls input[type=number] { width:5rem; }
.l10-controls input,.l10-controls select { font:inherit; padding:.35rem; max-width:100%; }
.l10-controls select { flex:1 1 210px; }
.l10-readout { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:.5rem; margin:.6rem 0; }
.l10-readout > div { padding:.65rem; border:1px solid #d9dfdb; border-radius:8px; }
.l10-readout dt { font-size:.88em; }.l10-readout dd { margin:.2rem 0 0; font-weight:700; font-size:1.1em; }
.l10-small { font-size:.9em; line-height:1.5; }.l10-error { color:#8b2929; }.l10-error:empty { display:none; }
.l10-legend { display:flex; flex-wrap:wrap; gap:.3rem 1rem; font-size:.9em; }
.l10-live { display:none; }.lecture10-explorer[data-mounted=true] .l10-live { display:block; }.lecture10-explorer[data-mounted=true] .l10-static { display:none; }
.lecture10-explorer :is(button,input,select):focus-visible { outline:3px solid #b77b18; outline-offset:3px; }
.lecture10-explorer [aria-invalid=true] { outline:2px solid #923a38; }
body[data-lecture="10"] .classroom-points > ul > li { margin:.55rem 0; }
body[data-lecture="10"] .classroom-points > ul > li > strong:first-child { color:#18384e; }
@media(max-width:700px) { .lecture10-explorer,.lecture10-figure { padding:.65rem; }.l10-readout { grid-template-columns:1fr; } body[data-lecture="10"] .math-pair.inline { display:inline-block; max-width:100%; overflow-x:auto; vertical-align:middle; padding-block:.1em; } }
@media print { .l10-live { display:none!important; }.l10-static { display:block!important; }.lecture10-explorer,.lecture10-figure { break-inside:avoid; } }

.l10-figure-scroll { max-width:100%; overflow-x:auto; }
.l10-figure-scroll:focus-visible { outline:3px solid #b77b18; outline-offset:3px; }
@media(max-width:700px) {
  .lecture10-explorer svg text { font-size:28px; }
  .lecture10-explorer svg text[font-weight] { font-size:30px; }
  .l10-figure-scroll svg { min-width:480px; }
}
@media print { .l10-figure-scroll { overflow:visible; }.l10-figure-scroll svg { min-width:0; } }
@media(max-width:700px) {
  body[data-lecture="10"] .exercises-shell .collapsible-body,
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/* Lecture 13: equal-scale observation-space projection; independent of other widgets. */
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