@font-face {
  font-family: "DM Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/dm-sans-400.ttf") format("truetype");
}

@font-face {
  font-family: "DM Sans";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/dm-sans-500.ttf") format("truetype");
}

@font-face {
  font-family: "DM Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("fonts/dm-sans-600.ttf") format("truetype");
}

@font-face {
  font-family: "DM Sans";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/dm-sans-700.ttf") format("truetype");
}

@font-face {
  font-family: "Space Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/space-mono-400.ttf") format("truetype");
}

@font-face {
  font-family: "Space Mono";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/space-mono-700.ttf") format("truetype");
}

:root {
  --paper: #f6f5f1;
  --paper-bright: #fffefa;
  --ink: #102141;
  --navy: #071a38;
  --navy-2: #0d2953;
  --cobalt: #2356d8;
  --cobalt-dark: #173ca0;
  --saffron: #f7b629;
  --vermilion: #e65440;
  --green: #237b63;
  --muted: #62708a;
  --line: #ccd3df;
  --line-light: #dfe4eb;
  --mist: #eef0f3;
  --shadow: 0 18px 45px rgba(7, 26, 56, 0.08);
  --shadow-small: 0 8px 22px rgba(7, 26, 56, 0.08);
  --radius: 10px;
  --display: "DM Sans", "Avenir Next", Avenir, Helvetica, Arial, sans-serif;
  --mono: "Space Mono", "SFMono-Regular", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--display);
  font-size: 15px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

button,
select,
a {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
select:focus-visible,
pre:focus-visible {
  outline: 3px solid var(--saffron);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 34px;
  border-bottom: 1px solid rgba(255, 254, 250, 0.2);
  color: var(--paper-bright);
  background: var(--navy);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(255, 254, 250, 0.7);
  color: var(--paper-bright);
  background: transparent;
}

.brand-mark svg {
  width: 25px;
  height: 25px;
}

.brand-type {
  display: grid;
  gap: 0;
  letter-spacing: 0.08em;
  line-height: 1;
}

.brand-type strong {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.brand-type span,
.brand-type em {
  font-family: var(--mono);
  font-size: 8px;
  font-style: normal;
  letter-spacing: 0.16em;
}

.brand-type em {
  color: var(--saffron);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.synthetic-badge,
.progress-chip,
.query-state,
.practice-status,
.builder-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.synthetic-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--green);
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--saffron);
  box-shadow: 0 0 0 3px rgba(247, 182, 41, 0.16);
}

.status-dot.is-green {
  background: #3fa887;
  box-shadow: 0 0 0 3px rgba(63, 168, 135, 0.15);
}

.toplink,
.text-button,
.lesson-source,
.rail-resource-link,
.site-footer a {
  text-decoration: none;
}

.toplink {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255, 254, 250, 0.78);
}

.toplink:hover,
.site-footer a:hover,
.lesson-source:hover,
.text-button:hover {
  color: var(--cobalt);
}

.topbar .toplink:hover {
  color: var(--saffron);
}

.icon-button {
  display: inline-grid;
  width: 34px;
  height: 34px;
  padding: 0;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper-bright);
  cursor: pointer;
  transition: border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.icon-button:hover {
  border-color: var(--cobalt);
  color: var(--cobalt);
  transform: translateY(-1px);
}

.topbar .icon-button {
  border-color: rgba(255, 254, 250, 0.34);
  color: var(--paper-bright);
  background: transparent;
}

.topbar .icon-button:hover {
  border-color: var(--saffron);
  color: var(--saffron);
}

.icon-button svg {
  width: 17px;
  height: 17px;
}

.small-icon {
  width: 30px;
  height: 30px;
}

.progress-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
}

.topbar .progress-chip {
  color: rgba(255, 254, 250, 0.78);
}

.progress-track,
.mini-progress {
  display: inline-block;
  overflow: hidden;
  height: 6px;
  background: var(--line-light);
}

.progress-track {
  width: 62px;
}

.topbar .progress-track {
  background: rgba(255, 254, 250, 0.22);
}

.progress-track span,
.mini-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--cobalt);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 320ms ease;
}

.topbar .progress-track span {
  background: var(--saffron);
}

.course-layout {
  display: grid;
  grid-template-columns: 225px minmax(0, 1fr);
  max-width: 1480px;
  margin: 0 auto;
}

.course-rail {
  position: sticky;
  top: 72px;
  align-self: start;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 72px);
  padding: 33px 20px 24px 30px;
  border-right: 1px solid var(--line);
}

.rail-intro {
  padding-bottom: 27px;
  border-bottom: 1px solid var(--line);
}

.rail-overline,
.section-label,
.route-stamp,
.lesson-meta,
.hero-footnote,
.source-note,
.query-card-footer,
.rail-progress,
.lesson-source,
.takeaway,
.practice-callout,
.site-footer,
.reference-kicker {
  font-family: var(--mono);
}

.rail-overline,
.section-label,
.route-stamp,
.reference-kicker {
  margin: 0 0 8px;
  color: var(--cobalt);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.rail-intro h2 {
  margin: 0;
  font-size: 18px;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.rail-copy {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.rail-progress {
  display: grid;
  gap: 8px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.rail-progress strong {
  color: var(--ink);
}

.mini-progress {
  width: 100%;
}

.rail-nav {
  padding: 22px 0;
}

.rail-section,
.rail-link {
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.rail-section {
  display: grid;
  grid-template-columns: 25px minmax(0, 1fr) 14px;
  align-items: center;
  gap: 9px;
  padding: 9px 0;
  color: var(--muted);
}

.rail-section:hover,
.rail-section.is-active {
  color: var(--ink);
}

.rail-section-title {
  display: block;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.2;
}

.rail-section small,
.rail-link {
  color: var(--muted);
  font-size: 10px;
  line-height: 1.25;
}

.rail-section svg {
  width: 14px;
  height: 14px;
  transition: transform 180ms ease;
}

.rail-section.is-active svg {
  transform: rotate(180deg);
}

.rail-number {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 9px;
}

.rail-section.is-active .rail-number {
  border-color: var(--cobalt);
  color: var(--cobalt);
  background: rgba(35, 86, 216, 0.08);
}

.rail-lock {
  display: grid;
  width: 18px;
  height: 18px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
}

.rail-lock svg {
  width: 12px;
  height: 12px;
}

.rail-subnav {
  display: grid;
  gap: 3px;
  margin: 2px 0 13px 34px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.rail-subnav.is-muted {
  opacity: 0.84;
}

.rail-link {
  position: relative;
  display: grid;
  grid-template-columns: 25px minmax(0, 1fr) 12px;
  gap: 3px;
  align-items: center;
  padding: 6px 0;
  color: var(--muted);
}

.rail-link:hover,
.rail-link.is-current {
  color: var(--cobalt);
}

.rail-link span:first-child {
  font-family: var(--mono);
  font-size: 9px;
}

.rail-link b {
  font-size: 11px;
  font-weight: 700;
  color: var(--green);
  opacity: 0;
}

.rail-link b svg {
  width: 13px;
  height: 13px;
  vertical-align: -2px;
}

.rail-link.is-complete b {
  opacity: 1;
}

.rail-footer {
  display: grid;
  gap: 15px;
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.rail-resource-link {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) 15px;
  gap: 8px;
  align-items: center;
  color: var(--ink);
}

.rail-resource-link svg {
  width: 18px;
  height: 18px;
  color: var(--cobalt);
}

.rail-resource-link strong,
.rail-resource-link small {
  display: block;
}

.rail-resource-link strong {
  font-size: 11px;
}

.rail-resource-link small {
  color: var(--muted);
  font-size: 10px;
}

.rail-resource-link .arrow {
  color: var(--cobalt);
}

.rail-resource-link .arrow svg {
  width: 15px;
  height: 15px;
}

.reset-button {
  padding: 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-family: var(--mono);
  font-size: 9px;
  text-align: left;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.reset-button:hover {
  color: var(--vermilion);
}

.course-main {
  min-width: 0;
  padding: 60px clamp(32px, 5vw, 88px) 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(370px, 0.92fr);
  gap: clamp(44px, 6vw, 96px);
  align-items: center;
  max-width: 1160px;
  min-height: 520px;
  margin: 0 auto;
}

.hero-copy {
  max-width: 650px;
}

.route-stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 21px;
}

.stamp-line {
  display: inline-block;
  width: 28px;
  height: 2px;
  background: var(--vermilion);
}

.hero h1 {
  max-width: 650px;
  margin: 0;
  color: var(--navy);
  font-size: clamp(42px, 5.1vw, 76px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.98;
}

.hero h1 span {
  display: inline;
  color: var(--cobalt);
}

.hero-lede {
  max-width: 610px;
  margin: 25px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 31px;
}

.primary-button,
.secondary-button,
.text-button,
.save-lesson,
.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 0;
  cursor: pointer;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.primary-button svg,
.secondary-button svg,
.text-button svg,
.lesson-source svg,
.practice-callout a svg,
.site-footer a svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.primary-button {
  min-height: 46px;
  padding: 0 18px;
  color: var(--paper-bright);
  background: var(--cobalt);
  font-size: 13px;
  font-weight: 700;
}

.primary-button:hover {
  background: var(--cobalt-dark);
  transform: translateY(-2px);
}

.primary-button.small {
  min-height: 38px;
  padding: 0 14px;
  font-size: 12px;
}

.secondary-button {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--paper-bright);
  font-size: 12px;
  font-weight: 700;
}

.secondary-button:hover {
  border-color: var(--cobalt);
  color: var(--cobalt);
  transform: translateY(-1px);
}

.text-button {
  padding: 0 3px;
  color: var(--muted);
  background: transparent;
  font-size: 13px;
  font-weight: 700;
}

.hero-footnote {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  max-width: 570px;
  margin-top: 31px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 10px;
  line-height: 1.5;
}

.footnote-mark {
  display: inline-grid;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  place-items: center;
  border: 1px solid var(--cobalt);
  border-radius: 50%;
  color: var(--cobalt);
  font-family: var(--display);
  font-size: 10px;
  font-weight: 700;
}

.hero-query-card {
  position: relative;
  overflow: hidden;
  padding: 28px 28px 20px;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: var(--paper-bright);
  box-shadow: 0 18px 34px rgba(7, 26, 56, 0.12);
}

.hero-query-card::before,
.hero-query-card::after {
  position: absolute;
  z-index: 0;
  content: "";
  background: var(--saffron);
}

.hero-query-card::before {
  top: 0;
  right: 0;
  width: 8px;
  height: 100%;
}

.hero-query-card::after {
  right: 0;
  bottom: 0;
  width: 100%;
  height: 8px;
}

.query-card-top,
.query-card-footer,
.builder-header,
.quiz-header,
.lesson-meta,
.lesson-footer,
.source-panel-heading,
.practice-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.query-card-top {
  position: relative;
  z-index: 1;
  gap: 11px;
}

.query-icon,
.quiz-icon {
  display: grid;
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  place-items: center;
  color: var(--saffron);
  border: 1px solid rgba(247, 182, 41, 0.58);
}

.query-icon svg,
.quiz-icon svg {
  width: 18px;
  height: 18px;
}

.query-card-top strong,
.query-card-top span,
.builder-header span,
.quiz-header span {
  display: block;
}

.query-card-top strong {
  font-size: 13px;
  line-height: 1.2;
}

.query-card-top div:nth-child(2) span {
  margin-top: 3px;
  color: rgba(255, 254, 250, 0.58);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.query-state {
  margin-left: auto;
  padding: 5px 7px;
  border: 1px solid rgba(247, 182, 41, 0.6);
  color: var(--saffron);
}

.query-question {
  position: relative;
  z-index: 1;
  margin: 32px 0 27px;
  color: var(--paper-bright);
  font-size: 20px;
  letter-spacing: -0.035em;
  line-height: 1.3;
}

.query-steps {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-start;
}

.query-step {
  min-width: 55px;
  text-align: center;
}

.query-step span,
.query-step b,
.query-step small {
  display: block;
}

.query-step span {
  width: 25px;
  height: 25px;
  margin: 0 auto 6px;
  padding-top: 5px;
  border: 1px solid rgba(255, 254, 250, 0.25);
  border-radius: 50%;
  color: rgba(255, 254, 250, 0.6);
  font-family: var(--mono);
  font-size: 8px;
}

.query-step b {
  color: rgba(255, 254, 250, 0.65);
  font-size: 10px;
}

.query-step small {
  margin-top: 3px;
  color: rgba(255, 254, 250, 0.42);
  font-family: var(--mono);
  font-size: 8px;
}

.query-step.is-done span,
.query-step.is-active span {
  border-color: var(--saffron);
  color: var(--navy);
  background: var(--saffron);
}

.query-step.is-active b,
.query-step.is-done b {
  color: var(--paper-bright);
}

.query-connector {
  flex: 1;
  height: 1px;
  margin: 12px 2px 0;
  background: rgba(255, 254, 250, 0.26);
}

.query-connector.is-done {
  background: var(--saffron);
}

.query-card-footer {
  position: relative;
  z-index: 1;
  margin-top: 29px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 254, 250, 0.16);
  color: rgba(255, 254, 250, 0.62);
  font-size: 9px;
}

.query-card-footer .status-dot {
  width: 6px;
  height: 6px;
  margin-right: 4px;
  box-shadow: none;
}

.mono,
code,
pre {
  font-family: var(--mono);
}

.route-section,
.learning-zone,
.practice-drawer,
.close-section {
  max-width: 1160px;
  margin: 0 auto;
}

.route-section {
  padding: 60px 0 76px;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.section-heading h2,
.practice-heading h2,
.source-panel h2 {
  margin: 0;
  font-size: clamp(25px, 2.8vw, 38px);
  letter-spacing: -0.06em;
  line-height: 1.04;
}

.section-explainer {
  max-width: 320px;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.routeboard {
  position: relative;
  min-height: 176px;
  margin-top: 21px;
  padding: 23px 0 0;
  border-bottom: 1px solid var(--line);
}

.route-path {
  position: absolute;
  top: 59px;
  left: 0;
  width: 100%;
  height: 76px;
  overflow: visible;
}

#routeProgressPath {
  transition: stroke-dashoffset 320ms ease;
}

.route-stops {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.route-stop {
  position: relative;
  display: grid;
  justify-items: start;
  gap: 5px;
  min-height: 116px;
  padding: 0 0 14px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.route-stop:hover,
.route-stop.is-current {
  border-bottom-color: var(--cobalt);
}

.route-stop:not(.is-current):not(.is-complete) {
  opacity: 0.72;
}

.stop-marker {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 10px;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.route-stop:hover .stop-marker,
.route-stop.is-current .stop-marker {
  border-color: var(--cobalt);
  color: var(--paper-bright);
  background: var(--cobalt);
  transform: scale(1.04);
}

.route-stop.is-complete .stop-marker {
  border-color: var(--green);
  color: var(--green);
  background: rgba(35, 123, 99, 0.08);
}

.stop-label {
  margin-top: 10px;
  font-size: 14px;
  font-weight: 700;
}

.route-stop small {
  color: var(--muted);
  font-size: 10px;
}

.learning-zone {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(290px, 0.8fr);
  gap: 22px;
  align-items: start;
}

.lesson-panel,
.source-panel {
  min-width: 0;
  border: 1px solid var(--line);
  background: rgba(255, 254, 250, 0.74);
}

.lesson-panel {
  padding: clamp(26px, 4vw, 47px);
}

.lesson-meta {
  margin-bottom: 28px;
  color: var(--cobalt);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-meta span:last-child {
  color: var(--muted);
  font-weight: 400;
}

.save-lesson {
  padding: 0;
  color: var(--muted);
  background: transparent;
  font-family: var(--mono);
  font-size: 9px;
}

.save-lesson:hover,
.save-lesson.is-saved {
  color: var(--cobalt);
}

.save-lesson svg {
  width: 17px;
  height: 17px;
}

.save-lesson.is-saved svg path {
  fill: rgba(35, 86, 216, 0.18);
}

.lesson-panel h2 {
  max-width: 680px;
  margin: 0;
  color: var(--navy);
  font-size: clamp(30px, 4vw, 53px);
  letter-spacing: -0.04em;
  line-height: 1.01;
}

.lesson-intro {
  max-width: 690px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

.takeaway {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 11px;
  margin: 29px 0;
  padding: 16px 17px;
  border: 1px solid rgba(247, 182, 41, 0.6);
  box-shadow: inset 0 3px 0 var(--saffron);
  background: #fff7df;
  font-size: 11px;
}

.takeaway p {
  margin: 0;
}

.takeaway-mark {
  color: var(--vermilion);
  font-weight: 700;
}

.takeaway-mark svg {
  width: 18px;
  height: 18px;
}

.lesson-body {
  max-width: 720px;
  color: var(--ink);
  font-size: 14px;
}

.lesson-body p {
  margin: 0 0 17px;
}

.lesson-body strong {
  color: var(--navy);
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.concept-row {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  padding: 14px;
  background: var(--paper-bright);
}

.concept-icon {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 1px solid var(--cobalt);
  color: var(--cobalt);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
}

.concept-row strong,
.concept-row small {
  display: block;
}

.concept-row strong {
  font-size: 12px;
}

.concept-row small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.4;
}

.lesson-footer {
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 37px;
  padding-top: 19px;
  border-top: 1px solid var(--line);
}

.lesson-source {
  color: var(--cobalt);
  font-size: 10px;
}

.lesson-nav {
  display: flex;
  gap: 8px;
}

.source-panel {
  padding: 27px 25px 24px;
  background: var(--navy);
  color: var(--paper-bright);
}

.source-panel .section-label {
  color: var(--saffron);
}

.source-panel h2 {
  color: var(--paper-bright);
  font-size: 26px;
}

.source-panel-heading {
  margin-bottom: 25px;
}

.source-panel .small-icon {
  border-color: rgba(255, 254, 250, 0.3);
  color: rgba(255, 254, 250, 0.72);
  background: transparent;
}

.source-panel .small-icon:hover {
  border-color: var(--saffron);
  color: var(--saffron);
}

.authority-ladder {
  position: relative;
  display: grid;
  gap: 11px;
}

.authority-line {
  position: absolute;
  top: 24px;
  bottom: 24px;
  left: 15px;
  width: 1px;
  background: rgba(255, 254, 250, 0.28);
}

.authority-card {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 30px 30px minmax(0, 1fr);
  gap: 9px;
  width: 100%;
  padding: 12px 11px 12px 0;
  border: 1px solid transparent;
  background: transparent;
  color: var(--paper-bright);
  text-align: left;
  cursor: pointer;
}

.authority-card:hover,
.authority-card.is-current {
  border-color: rgba(255, 254, 250, 0.2);
  background: rgba(255, 254, 250, 0.07);
}

.authority-number,
.authority-icon {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1px solid rgba(255, 254, 250, 0.34);
  border-radius: 50%;
  color: rgba(255, 254, 250, 0.7);
  font-family: var(--mono);
  font-size: 9px;
}

.authority-icon {
  border-radius: 0;
  color: var(--saffron);
}

.authority-icon svg {
  width: 17px;
  height: 17px;
}

.authority-copy strong,
.authority-copy em,
.authority-copy small,
.authority-copy code {
  display: block;
}

.authority-copy strong {
  font-size: 12px;
}

.authority-copy em {
  margin-top: 1px;
  color: var(--saffron);
  font-family: var(--mono);
  font-size: 8px;
  font-style: normal;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.authority-copy small {
  margin-top: 5px;
  color: rgba(255, 254, 250, 0.65);
  font-size: 10px;
  line-height: 1.4;
}

.authority-copy code {
  margin-top: 6px;
  color: rgba(255, 254, 250, 0.48);
  font-size: 8px;
}

.source-note {
  display: grid;
  grid-template-columns: 9px minmax(0, 1fr);
  gap: 9px;
  align-items: start;
  margin: 21px 0 0;
  padding-top: 17px;
  border-top: 1px solid rgba(255, 254, 250, 0.17);
  color: rgba(255, 254, 250, 0.68);
  font-size: 10px;
  line-height: 1.5;
}

.source-note .status-dot {
  margin-top: 4px;
  box-shadow: none;
}

.source-note p {
  margin: 0;
}

.source-note strong {
  color: var(--paper-bright);
}

.practice-drawer {
  margin-top: 70px;
  padding: 28px 24px 24px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy);
  background: var(--paper-bright);
  box-shadow: 0 -14px 34px rgba(7, 26, 56, 0.08);
}

.practice-heading {
  align-items: flex-end;
  margin-bottom: 21px;
}

.practice-status {
  color: var(--muted);
}

.practice-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
  gap: 1px;
  background: var(--line);
}

.quiz-panel,
.query-builder {
  min-width: 0;
  padding: 27px;
  background: var(--paper-bright);
}

.query-builder {
  background: #e7ebf2;
}

.quiz-header {
  justify-content: flex-start;
  gap: 9px;
  color: var(--cobalt);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.quiz-count {
  margin-left: auto;
  color: var(--muted);
  font-size: 9px;
  font-weight: 400;
}

.quiz-icon {
  width: 25px;
  height: 25px;
  border-color: var(--line);
  color: var(--cobalt);
}

.quiz-panel h3 {
  max-width: 420px;
  margin: 21px 0 19px;
  font-size: 21px;
  letter-spacing: -0.04em;
  line-height: 1.18;
}

.quiz-options {
  display: grid;
  gap: 8px;
}

.quiz-option {
  display: grid;
  grid-template-columns: 25px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  width: 100%;
  padding: 11px;
  border: 1px solid var(--line);
  background: var(--paper);
  font-size: 11px;
  text-align: left;
  cursor: pointer;
}

.quiz-option:hover {
  border-color: var(--cobalt);
}

.quiz-option-mark {
  display: grid;
  width: 23px;
  height: 23px;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
}

.quiz-option.is-selected {
  border-color: var(--cobalt);
  color: var(--cobalt-dark);
  background: #edf2ff;
}

.quiz-option.is-correct {
  border-color: var(--green);
  color: var(--green);
  background: #e8f4ef;
}

.quiz-option.is-wrong {
  border-color: var(--vermilion);
  color: #a83627;
  background: #fff0ed;
}

.quiz-feedback {
  min-height: 35px;
  margin-top: 13px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.45;
}

.quiz-feedback.is-correct {
  color: var(--green);
}

.quiz-feedback.is-wrong {
  color: var(--vermilion);
}

.builder-header {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.builder-header > div {
  display: flex;
  gap: 8px;
  align-items: center;
}

.builder-icon {
  color: var(--vermilion);
}

.builder-icon svg {
  width: 17px;
  height: 17px;
}

.builder-tag {
  color: var(--green);
}

.query-builder > p {
  max-width: 470px;
  margin: 19px 0 16px;
  color: var(--muted);
  font-size: 11px;
}

.builder-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.builder-fields label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.builder-fields select {
  min-height: 37px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--ink);
  background: var(--paper-bright);
  font-family: var(--display);
  font-size: 11px;
  letter-spacing: 0;
  text-transform: none;
}

.builder-button {
  margin-top: 15px;
  background: transparent;
}

.query-preview {
  min-height: 112px;
  margin: 13px 0 0;
  padding: 13px;
  overflow: auto;
  border: 1px solid var(--navy);
  color: var(--paper-bright);
  background: var(--navy);
  font-size: 10px;
  line-height: 1.65;
  white-space: pre-wrap;
}

.copy-button {
  margin-top: 10px;
  padding: 0;
  color: var(--cobalt);
  background: transparent;
  font-family: var(--mono);
  font-size: 9px;
}

.copy-button:hover {
  color: var(--cobalt-dark);
}

.copy-button svg {
  width: 16px;
  height: 16px;
}

.practice-callout {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  margin-top: 17px;
  padding: 14px 16px;
  border: 1px solid rgba(230, 84, 64, 0.45);
  background: #fff1ed;
  color: #703227;
  font-size: 10px;
}

.practice-callout p {
  margin: 0;
}

.practice-callout strong {
  color: var(--vermilion);
}

.practice-callout a {
  color: var(--vermilion);
  font-weight: 700;
  text-decoration: none;
}

.change-set-simulator {
  margin-top: 28px;
  padding: 22px;
  border: 1px solid var(--navy);
  background: var(--paper-bright);
}

.simulator-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.simulator-heading .section-label {
  margin-bottom: 6px;
  color: var(--vermilion);
}

.simulator-heading h3 {
  margin: 0;
  color: var(--navy);
  font-size: 22px;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.simulator-status {
  flex: 0 0 auto;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
}

.simulator-stages {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 16px;
  background: var(--line);
}

.simulator-stage {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  padding: 11px 10px;
  border: 0;
  color: var(--muted);
  background: var(--mist);
  text-align: left;
  cursor: pointer;
}

.simulator-stage:hover,
.simulator-stage.is-active {
  color: var(--cobalt-dark);
  background: #edf2ff;
}

.simulator-stage span {
  display: grid;
  width: 23px;
  height: 23px;
  place-items: center;
  border: 1px solid currentColor;
  font-family: var(--mono);
  font-size: 8px;
}

.simulator-stage strong,
.simulator-stage small {
  display: block;
}

.simulator-stage strong {
  font-size: 10px;
  line-height: 1.15;
}

.simulator-stage small {
  margin-top: 3px;
  font-family: var(--mono);
  font-size: 8px;
}

.simulator-output {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  margin-top: 16px;
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.simulator-output-mark {
  display: grid;
  width: 27px;
  height: 27px;
  place-items: center;
  border: 1px solid var(--cobalt);
  color: var(--cobalt);
}

.simulator-output-mark svg {
  width: 17px;
  height: 17px;
}

.simulator-output strong,
.simulator-output p {
  display: block;
}

.simulator-output strong {
  color: var(--navy);
  font-size: 12px;
}

.simulator-output p {
  max-width: 600px;
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.45;
}

.simulator-boundary {
  padding: 5px 7px;
  border: 1px solid var(--green);
  color: var(--green);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.06em;
}

.callout-icon {
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 1px solid var(--vermilion);
  color: var(--vermilion);
  font-family: var(--display);
  font-size: 13px;
  font-weight: 700;
}

.callout-icon svg {
  width: 17px;
  height: 17px;
}

.close-section {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  margin-top: 85px;
  padding: 31px 0 66px;
  border-top: 1px solid var(--line);
}

.close-mark {
  display: flex;
  gap: 4px;
  align-items: flex-end;
  height: 44px;
}

.close-mark span {
  display: block;
  width: 12px;
  background: var(--cobalt);
}

.close-mark span:nth-child(1) {
  height: 21px;
}

.close-mark span:nth-child(2) {
  height: 34px;
  background: var(--saffron);
}

.close-mark span:nth-child(3) {
  height: 44px;
  background: var(--vermilion);
}

.close-section h2 {
  margin: 0;
  color: var(--navy);
  font-size: 24px;
  letter-spacing: -0.05em;
}

.close-section p {
  max-width: 620px;
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 90px;
  padding: 20px max(30px, calc((100vw - 1370px) / 2));
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 9px;
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer strong {
  color: var(--ink);
  font-size: 10px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 17px;
}

.site-footer nav a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.toast {
  position: fixed;
  z-index: 50;
  right: 24px;
  bottom: 24px;
  max-width: 330px;
  padding: 12px 15px;
  border: 1px solid var(--navy);
  color: var(--paper-bright);
  background: var(--navy);
  box-shadow: var(--shadow-small);
  font-family: var(--mono);
  font-size: 10px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Shared lesson and reference surfaces */

.document-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 30px 80px;
}

.document-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.document-top .brand {
  color: var(--navy);
}

.back-link {
  color: var(--cobalt);
  font-family: var(--mono);
  font-size: 10px;
  text-decoration: none;
}

.document-hero {
  max-width: 790px;
  padding: 72px 0 55px;
}

.document-hero h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(42px, 6vw, 74px);
  letter-spacing: -0.04em;
  line-height: 0.98;
}

.document-hero h1 span {
  color: var(--cobalt);
}

.document-hero > p:last-child {
  max-width: 690px;
  margin: 23px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.6;
}

.lesson-doc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 24px;
  align-items: start;
}

.lesson-doc-main,
.reference-panel {
  border: 1px solid var(--line);
  background: rgba(255, 254, 250, 0.78);
}

.lesson-doc-main {
  padding: clamp(26px, 4vw, 46px);
}

.lesson-doc-main h2,
.reference-panel h2 {
  margin: 0 0 15px;
  color: var(--navy);
  font-size: 27px;
  letter-spacing: -0.06em;
  line-height: 1.08;
}

.lesson-doc-main h3 {
  margin: 32px 0 8px;
  color: var(--cobalt-dark);
  font-size: 17px;
  letter-spacing: -0.03em;
}

.lesson-doc-main p,
.lesson-doc-main li {
  max-width: 690px;
  color: var(--ink);
  font-size: 14px;
}

.lesson-doc-main p {
  margin: 0 0 16px;
}

.lesson-doc-main ul,
.lesson-doc-main ol {
  margin: 0 0 22px;
  padding-left: 21px;
}

.lesson-doc-main li {
  margin: 7px 0;
}

.lesson-doc-main code,
.reference-panel code {
  padding: 2px 4px;
  color: var(--cobalt-dark);
  background: #e7edff;
  font-size: 0.88em;
}

.doc-callout {
  margin: 24px 0;
  padding: 16px 18px;
  border: 1px solid rgba(247, 182, 41, 0.6);
  box-shadow: inset 0 3px 0 var(--saffron);
  background: #fff7df;
}

.doc-callout strong {
  display: block;
  margin-bottom: 4px;
  color: var(--vermilion);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.doc-callout p {
  margin: 0;
  font-size: 13px;
}

.doc-quiz {
  margin-top: 36px;
  padding: 21px;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: var(--paper-bright);
}

.doc-quiz h2 {
  color: var(--paper-bright);
  font-size: 21px;
}

.doc-quiz p {
  color: rgba(255, 254, 250, 0.7);
  font-size: 12px;
}

.doc-quiz-options {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.doc-quiz button {
  padding: 11px 13px;
  border: 1px solid rgba(255, 254, 250, 0.25);
  color: var(--paper-bright);
  background: transparent;
  font-size: 12px;
  text-align: left;
  cursor: pointer;
}

.doc-quiz button:hover,
.doc-quiz button.is-correct {
  border-color: var(--saffron);
  background: rgba(247, 182, 41, 0.13);
}

.doc-quiz button.is-wrong {
  border-color: var(--vermilion);
  background: rgba(230, 84, 64, 0.13);
}

.doc-quiz-feedback {
  min-height: 20px;
  margin: 13px 0 0;
  color: var(--saffron);
  font-family: var(--mono);
  font-size: 10px;
}

.reference-panel {
  position: sticky;
  top: 92px;
  padding: 23px;
}

.reference-panel h2 {
  font-size: 20px;
}

.reference-panel ul {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.reference-panel li {
  padding-top: 9px;
  border-top: 1px solid var(--line);
}

.reference-panel a {
  color: var(--cobalt);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.reference-panel small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 10px;
}

.citation {
  margin-top: 35px !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted) !important;
  font-family: var(--mono);
  font-size: 10px !important;
}

.reference-table-wrap {
  overflow-x: auto;
  margin: 22px 0 29px;
}

.reference-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 12px;
}

.reference-table th,
.reference-table td {
  padding: 12px 10px;
  border: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}

.reference-table th {
  color: var(--navy);
  background: var(--mist);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.reference-table td {
  color: var(--ink);
}

.route-checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.route-checklist div {
  padding: 15px;
  background: var(--paper-bright);
}

.route-checklist strong,
.route-checklist span {
  display: block;
}

.route-checklist strong {
  color: var(--cobalt-dark);
  font-family: var(--mono);
  font-size: 10px;
}

.route-checklist span {
  margin-top: 5px;
  font-size: 12px;
}

@media (max-width: 1180px) {
  .course-main {
    padding-right: 42px;
    padding-left: 42px;
  }

  .hero {
    gap: 50px;
  }
}

@media (max-width: 1050px) {
  .course-layout {
    grid-template-columns: 190px minmax(0, 1fr);
  }

  .course-rail {
    padding-left: 20px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 35px;
    min-height: auto;
    padding-top: 18px;
  }

  .hero-query-card {
    max-width: 650px;
    margin-bottom: 20px;
  }

  .learning-zone,
  .practice-grid {
    grid-template-columns: 1fr;
  }

  .source-panel {
    display: grid;
    grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
    gap: 22px;
    align-items: start;
  }

  .source-panel-heading {
    grid-column: 1;
  }

  .authority-ladder {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .source-note {
    grid-column: 1;
    margin-top: 0;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 14px;
  }

  .topbar {
    min-height: 62px;
    padding: 0 16px;
  }

  .topbar-actions {
    gap: 10px;
  }

  .synthetic-badge,
  .toplink {
    display: none;
  }

  .progress-chip {
    font-size: 8px;
  }

  .progress-track {
    width: 45px;
  }

  .course-layout {
    display: block;
  }

  .course-rail {
    position: relative;
    top: auto;
    min-height: 0;
    padding: 23px 16px 18px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail-intro {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 116px;
    gap: 11px 22px;
    align-items: start;
    padding-bottom: 17px;
  }

  .rail-intro .rail-overline,
  .rail-intro h2,
  .rail-intro .rail-copy {
    grid-column: 1;
  }

  .rail-intro .rail-overline {
    margin-bottom: 0;
  }

  .rail-intro h2 {
    grid-row: 2;
  }

  .rail-copy {
    grid-row: 3;
    margin-top: 0;
  }

  .rail-progress {
    grid-column: 2;
    grid-row: 1 / span 3;
    align-self: center;
    margin-top: 0;
  }

  .rail-nav {
    display: flex;
    gap: 8px;
    padding: 14px 0 7px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .rail-nav::-webkit-scrollbar {
    display: none;
  }

  .rail-section {
    display: none;
  }

  .rail-subnav {
    display: contents;
    margin: 0;
    padding: 0;
    border: 0;
  }

  .rail-link {
    display: block;
    flex: 0 0 auto;
    width: auto;
    min-width: 110px;
    padding: 8px 10px;
    border: 1px solid var(--line);
    background: var(--paper-bright);
    font-size: 10px;
  }

  .rail-link span:first-child {
    display: block;
    margin-bottom: 4px;
    color: var(--cobalt);
  }

  .rail-link b {
    display: none;
  }

  .rail-footer {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding-top: 12px;
  }

  .rail-resource-link {
    grid-template-columns: 18px minmax(0, 1fr);
  }

  .rail-resource-link .arrow {
    display: none;
  }

  .course-main {
    padding: 27px 16px 0;
  }

  .hero {
    gap: 31px;
    padding-top: 0;
  }

  .hero h1 {
    font-size: clamp(42px, 13vw, 65px);
  }

  .hero-lede {
    font-size: 14px;
  }

  .hero-query-card {
    padding: 21px 17px 17px;
    box-shadow: 0 14px 26px rgba(7, 26, 56, 0.12);
  }

  .query-question {
    margin: 25px 0 21px;
    font-size: 17px;
  }

  .query-steps {
    justify-content: space-between;
  }

  .query-step {
    min-width: 42px;
  }

  .query-step small {
    display: none;
  }

  .query-connector {
    min-width: 8px;
  }

  .route-section {
    padding: 57px 0 52px;
  }

  .section-heading {
    display: block;
  }

  .section-explainer {
    margin-top: 13px;
  }

  .routeboard {
    min-height: 151px;
    overflow-x: auto;
    padding-bottom: 0;
  }

  .route-stops {
    min-width: 650px;
  }

  .route-path {
    min-width: 650px;
  }

  .lesson-panel {
    padding: 24px 19px;
  }

  .lesson-meta {
    align-items: flex-start;
  }

  .lesson-meta span:last-child {
    max-width: 80px;
    text-align: right;
  }

  .lesson-panel h2 {
    font-size: 37px;
  }

  .lesson-intro {
    font-size: 14px;
  }

  .concept-grid,
  .builder-fields,
  .route-checklist {
    grid-template-columns: 1fr;
  }

  .source-panel {
    display: block;
    padding: 23px 19px;
  }

  .source-note {
    margin-top: 21px;
  }

  .practice-drawer {
    margin-top: 54px;
    padding: 24px 18px 18px;
  }

  .practice-heading {
    align-items: flex-start;
  }

  .practice-heading h2 {
    font-size: 29px;
  }

  .quiz-panel,
  .query-builder {
    padding: 22px 18px;
  }

  .practice-callout {
    grid-template-columns: 26px minmax(0, 1fr);
  }

  .practice-callout a {
    grid-column: 2;
  }

  .change-set-simulator {
    padding: 18px;
  }

  .simulator-heading {
    display: block;
  }

  .simulator-status {
    display: block;
    margin-top: 10px;
  }

  .simulator-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .simulator-output {
    grid-template-columns: 30px minmax(0, 1fr);
  }

  .simulator-boundary {
    grid-column: 2;
    justify-self: start;
  }

  .close-section {
    grid-template-columns: 45px minmax(0, 1fr);
    gap: 16px;
    margin-top: 62px;
    padding-bottom: 48px;
  }

  .close-section .primary-button {
    grid-column: 2;
    justify-self: start;
  }

  .site-footer {
    display: block;
    padding: 22px 16px;
  }

  .site-footer nav {
    margin-top: 17px;
  }

  .document-page {
    padding: 27px 16px 55px;
  }

  .document-hero {
    padding: 50px 0 37px;
  }

  .document-hero h1 {
    font-size: clamp(44px, 13vw, 68px);
  }

  .document-hero > p:last-child {
    font-size: 15px;
  }

  .lesson-doc-grid {
    grid-template-columns: 1fr;
  }

  .reference-panel {
    position: static;
  }

  .lesson-doc-main {
    padding: 25px 19px;
  }

  .lesson-doc-main h2 {
    font-size: 24px;
  }

  .document-top .brand-type {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

body[data-reduced-motion="true"] *,
body[data-reduced-motion="true"] *::before,
body[data-reduced-motion="true"] *::after {
  transition-duration: 0.01ms !important;
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
}