body.guided-lesson-theme {
  --lesson-shell-max: 1760px;
  --lesson-rail-width: 272px;
  --lesson-rail-collapsed-width: 72px;
  --lesson-topbar-height: 78px;
  --lesson-layer-journey: 35;
  --lesson-layer-rail: 40;
  --lesson-layer-topbar: 50;
  --lesson-layer-dialog: 70;
  --lesson-layer-toast: 80;
  --lesson-topbar-control-size: 44px;
  --lesson-type-caption: 0.9rem;
  --lesson-type-meta: 0.8125rem;
  --lesson-type-control: 0.875rem;
  --lesson-type-body: 1rem;
  --lesson-type-lead: 1.125rem;
  --lesson-type-subhead: 1.25rem;
  --lesson-type-title: 1.5rem;
  --lesson-type-display: clamp(3.25rem, 6.2vw, 5.75rem);
  --lesson-type-section-title: clamp(2.5rem, 4.2vw, 4rem);
  --lesson-weight-body: 650;
  --lesson-weight-label: 800;
  --lesson-weight-heading: 900;
  --lesson-weight-display: 1000;
  overflow-x: clip;
  background: var(--studio-surface-soft);
  font-kerning: normal;
  font-optical-sizing: auto;
}

.guided-lesson-app {
  min-height: 100vh;
}

.guided-lesson-app [hidden] {
  display: none !important;
}

.lesson-topbar {
  position: sticky;
  top: 0;
  z-index: var(--lesson-layer-topbar);
  min-height: var(--lesson-topbar-height);
  display: grid;
  grid-template-columns:
    minmax(250px, var(--lesson-rail-width))
    minmax(320px, 1fr)
    auto;
  align-items: center;
  gap: 18px;
  padding: 10px max(20px, calc((100vw - var(--lesson-shell-max)) / 2));
  background: #fff;
  border-bottom: 1px solid var(--studio-line);
}

.lesson-brand {
  min-width: 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--studio-ink);
  text-decoration: none;
}

.lesson-brand__mark {
  width: 50px;
  height: 50px;
  flex: 0 0 50px;
}

.lesson-brand__mark svg {
  width: 100%;
  height: 100%;
}

.lesson-brand > span:last-child {
  min-width: 0;
}

.lesson-brand strong {
  overflow: hidden;
  font-size: clamp(1.125rem, 1.5vw, 1.5rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.03em;
  line-height: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-course-switcher {
  width: min(100%, 760px);
  min-width: 0;
  min-height: 52px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px;
  align-items: center;
  column-gap: 12px;
  padding: 7px 8px 7px 14px;
  background: var(--studio-surface-soft);
  border: 1px solid var(--studio-line);
  border-radius: 12px;
  color: var(--studio-ink);
  cursor: pointer;
  justify-self: start;
  text-align: left;
  transition:
    background var(--studio-motion-fast) var(--studio-ease-out),
    border-color var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-switcher__copy {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.lesson-course-switcher__copy > span {
  display: block;
  overflow: hidden;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-caption);
  font-weight: var(--lesson-weight-label);
  line-height: 1.15;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-course-switcher__copy strong {
  display: block;
  min-width: 0;
  overflow: hidden;
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-heading);
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-chevron-icon {
  width: 20px;
  height: 20px;
  display: block;
  flex: 0 0 auto;
  overflow: visible;
  fill: none;
}

.lesson-course-switcher__chevron {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 9px;
  color: var(--studio-ink-soft);
  transition:
    background var(--studio-motion-fast) var(--studio-ease-out),
    border-color var(--studio-motion-fast) var(--studio-ease-out),
    color var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-switcher__chevron svg {
  width: 18px;
  height: 18px;
  transition: transform var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-switcher[aria-expanded="true"] {
  background: #fff;
  border-color: var(--studio-ink);
}

.lesson-course-switcher[aria-expanded="true"] .lesson-course-switcher__chevron {
  background: var(--studio-yellow);
  border-color: var(--studio-ink);
  color: var(--studio-ink);
}

.lesson-course-switcher[aria-expanded="true"]
  .lesson-course-switcher__chevron
  svg {
  transform: rotate(180deg);
}

.lesson-topbar__progress,
.lesson-account__trigger {
  height: var(--lesson-topbar-control-size);
  box-sizing: border-box;
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  border-radius: 999px;
  color: var(--studio-ink);
}

.lesson-topbar__progress {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
}

.lesson-topbar__progress strong {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  font-size: 1rem;
  font-weight: var(--lesson-weight-display);
  font-variant-numeric: tabular-nums;
}

.lesson-topbar__progress strong span {
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-caption);
  font-weight: var(--lesson-weight-label);
}

.lesson-topbar__progress strong [data-course-progress-count] {
  color: var(--studio-ink);
  font-size: 1rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-topbar__progress-login {
  height: 100%;
  display: inline-flex;
  align-items: center;
  margin: 0;
  padding: 0;
  color: var(--studio-ink);
  font-size: var(--lesson-type-caption);
  font-weight: var(--lesson-weight-heading);
  line-height: 1.2;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.lesson-topbar__progress:has(.lesson-topbar__progress-login:not([hidden]))
  > strong {
  display: none;
}

.lesson-topbar__actions {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  justify-self: end;
  gap: 8px;
}

.lesson-account__trigger {
  width: var(--lesson-topbar-control-size);
  flex: 0 0 var(--lesson-topbar-control-size);
  display: grid;
  place-items: center;
  padding: 0;
  cursor: pointer;
  font-size: 1rem;
  font-weight: var(--lesson-weight-display);
  line-height: 1;
  transition:
    background var(--studio-motion-fast) var(--studio-ease-out),
    transform var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-account__trigger:hover,
.lesson-account:has(.lesson-account__menu:popover-open)
  .lesson-account__trigger {
  background: #fff;
}

.lesson-account__trigger:active {
  transform: translateY(1px);
}

.lesson-account__trigger:focus-visible,
.lesson-account__menu a:focus-visible,
.lesson-account__menu button:focus-visible {
  outline: 2px solid var(--studio-focus-ring);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--studio-focus-halo);
}

.lesson-account__menu {
  position: fixed;
  inset: calc(var(--lesson-topbar-height) - 2px)
    max(12px, calc((100vw - var(--lesson-shell-max)) / 2)) auto auto;
  width: min(320px, calc(100vw - 24px));
  margin: 0;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 14px;
  color: var(--studio-ink);
  box-shadow: 0 8px 8px rgba(15, 15, 15, 0.08);
}

.lesson-account__menu::backdrop {
  background: transparent;
}

.lesson-account__identity {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px;
}

.lesson-account__avatar {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  background: var(--studio-yellow);
  border-radius: 50%;
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-heading);
}

.lesson-account__identity > span:last-child {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.lesson-account__identity strong,
.lesson-account__identity small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-account__identity strong {
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-heading);
}

.lesson-account__identity small {
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-meta);
}

.lesson-account__access {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 6px 0 8px;
  padding: 9px 10px;
  background: var(--studio-surface-soft);
  border-radius: 9px;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-meta);
  font-weight: var(--lesson-weight-label);
}

.lesson-account__access > span {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  background: var(--studio-green);
  border-radius: 50%;
}

.lesson-account__menu nav {
  display: grid;
  gap: 2px;
}

.lesson-account__menu nav a,
.lesson-account__menu nav button,
.lesson-account__logout {
  min-height: 42px;
  display: flex;
  align-items: center;
  width: 100%;
  padding: 9px 10px;
  background: transparent;
  border: 0;
  border-radius: 9px;
  color: var(--studio-ink);
  cursor: pointer;
  font: inherit;
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-label);
  text-align: left;
  text-decoration: none;
}

.lesson-account__menu nav a:hover,
.lesson-account__menu nav button:hover,
.lesson-account__logout:hover {
  background: var(--studio-surface-soft);
}

.lesson-account__menu nav button:disabled {
  color: var(--studio-ink-soft);
  cursor: wait;
}

.lesson-account__status {
  margin: 4px 10px;
  color: var(--studio-red-ink);
  font-size: var(--lesson-type-meta);
  font-weight: var(--lesson-weight-label);
}

.lesson-account__status:empty {
  display: none;
}

.lesson-account__logout {
  margin-top: 6px;
  border-top: 1px solid var(--studio-line);
  border-radius: 0 0 9px 9px;
  color: var(--studio-red-ink);
}

.lesson-shell {
  width: min(var(--lesson-shell-max), 100%);
  margin: 0 auto;
}

.lesson-course-rail {
  display: none;
}

.guided-lesson-main {
  width: min(1480px, calc(100% - 40px));
  margin: 0 auto;
  background: #fff;
  border-right: 1px solid var(--studio-line);
  border-left: 1px solid var(--studio-line);
}

.lesson-course-rail__head {
  min-height: 120px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 12px 14px 18px;
  border-bottom: 1px solid var(--studio-line);
}

.lesson-course-rail__head > div {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.lesson-course-rail__head-copy > strong {
  overflow: hidden;
  font-size: 1rem;
  font-weight: var(--lesson-weight-heading);
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-course-rail__head-copy > span {
  color: var(--studio-ink-soft);
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-body);
}

.lesson-course-progress {
  --course-progress-percent: 0%;
  min-width: 0;
  display: grid;
  gap: 6px;
  margin-top: 8px;
}

.lesson-course-progress__label {
  min-width: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  color: var(--studio-ink-soft);
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.2;
}

.lesson-course-progress__label > span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-course-progress__label strong {
  flex: 0 0 auto;
  color: var(--studio-ink);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  font-weight: var(--lesson-weight-heading);
}

.lesson-course-progress__track {
  height: 4px;
  display: block;
  overflow: hidden;
  background: var(--studio-line);
  border-radius: 999px;
}

.lesson-course-progress__track i {
  width: var(--course-progress-percent);
  height: 100%;
  display: block;
  background: var(--studio-green);
  border-radius: inherit;
  transition: width var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-progress__login {
  width: fit-content;
  color: var(--studio-ink);
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.25;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.lesson-course-rail__head button,
.lesson-course-picker__head button {
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  display: grid;
  place-items: center;
  padding: 0;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 12px;
  color: var(--studio-ink);
  cursor: pointer;
  transition:
    background var(--studio-motion-fast) var(--studio-ease-out),
    border-color var(--studio-motion-fast) var(--studio-ease-out),
    color var(--studio-motion-fast) var(--studio-ease-out),
    transform var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-switcher:focus-visible,
.lesson-course-rail__head button:focus-visible,
.lesson-course-picker__head button:focus-visible,
.lesson-course-pager > button:focus-visible {
  outline-color: var(--studio-focus-ring);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--studio-focus-halo);
}

.lesson-course-picker__head button span {
  color: inherit;
  font-size: 1.5625rem;
  font-weight: var(--lesson-weight-body);
  line-height: 1;
}

.lesson-course-rail__toggle-icon {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  color: inherit;
}

.lesson-course-rail__toggle-icon svg {
  width: 20px;
  height: 20px;
  transform: rotate(90deg);
  transition: transform var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-rail nav {
  padding: 12px;
}

.lesson-course-topic {
  border-bottom: 1px solid var(--studio-line);
}

.lesson-course-topic:last-child {
  border-bottom: 0;
}

.lesson-course-topic summary {
  min-height: 54px;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 7px 4px;
  border-radius: 10px;
  cursor: pointer;
  list-style: none;
}

.lesson-course-topic summary::-webkit-details-marker {
  display: none;
}

.lesson-course-topic summary:focus-visible {
  outline: 2px solid var(--studio-focus-ring);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--studio-focus-halo);
}

.lesson-course-topic__mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 10px;
  color: var(--studio-ink-soft);
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-heading);
  letter-spacing: 0.03em;
}

.lesson-course-topic.is-current .lesson-course-topic__mark {
  background: var(--studio-yellow);
  border-color: var(--studio-ink);
  color: var(--studio-ink);
}

.lesson-course-topic__copy {
  min-width: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.lesson-course-topic__copy strong {
  overflow: hidden;
  font-size: 0.8125rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lesson-course-topic__copy small {
  color: var(--studio-footnote);
  font-size: var(--lesson-type-caption);
  font-variant-numeric: tabular-nums;
  font-weight: var(--lesson-weight-label);
  white-space: nowrap;
}

.lesson-course-topic__chevron {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  color: var(--studio-ink-soft);
  transition: transform var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-topic__chevron svg {
  width: 18px;
  height: 18px;
}

.lesson-course-topic[open] .lesson-course-topic__chevron {
  transform: rotate(180deg);
}

.lesson-course-topic ol,
.lesson-course-picker ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.lesson-course-topic ol {
  display: grid;
  gap: 4px;
  padding: 2px 0 12px;
}

.lesson-course-link {
  min-height: 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 22px;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--studio-ink-soft);
  text-decoration: none;
}

.lesson-course-link.is-current {
  background: var(--studio-yellow);
  border-color: var(--studio-ink);
  color: var(--studio-ink);
}

.lesson-course-link__title {
  min-width: 0;
  display: -webkit-box;
  overflow: hidden;
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.25;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.lesson-course-link__state,
.lesson-course-picker__state {
  color: var(--studio-ghost);
  font-size: 0.9375rem;
  font-weight: var(--lesson-weight-heading);
  text-align: center;
}

.lesson-course-link.is-completed .lesson-course-link__state,
.lesson-course-picker__link.is-completed .lesson-course-picker__state {
  color: var(--studio-green-ink);
}

body.course-picker-open {
  overflow: hidden;
}

.lesson-course-picker {
  width: min(920px, calc(100vw - 48px));
  max-width: none;
  max-height: calc(100dvh - 48px);
  margin: auto;
  padding: 0;
  overflow: hidden;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: 16px;
  box-shadow: 8px 8px 0 var(--studio-ink);
  color: var(--studio-ink);
}

.lesson-course-picker::backdrop {
  background: rgb(20 20 20 / 48%);
}

.lesson-course-picker__panel {
  max-height: calc(100dvh - 52px);
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
}

.lesson-course-picker__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 24px;
  border-bottom: 1px solid var(--studio-line);
}

.lesson-course-picker__head h2 {
  margin: 0;
  font-size: 1.875rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.lesson-course-picker__head p {
  max-width: 60ch;
  margin: 7px 0 0;
  color: var(--studio-ink-soft);
  font-size: 0.875rem;
  line-height: 1.45;
}

.lesson-course-search {
  display: grid;
  gap: 7px;
  padding: 18px 24px;
  background: var(--studio-surface-soft);
  border-bottom: 1px solid var(--studio-line);
}

.lesson-course-search > span:first-child {
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-label);
}

.lesson-course-search__field {
  min-height: 50px;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 12px;
}

.lesson-course-search__field:focus-within {
  border-color: var(--studio-focus-ring);
  outline: 2px solid var(--studio-focus-ring);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--studio-focus-halo);
}

.lesson-course-search__field b {
  font-size: 1.3125rem;
  font-weight: var(--lesson-weight-body);
}

.lesson-course-search input {
  min-width: 0;
  height: 48px;
  padding: 0;
  background: transparent;
  border: 0;
  color: var(--studio-ink);
  font: inherit;
  font-size: 0.9375rem;
  outline: 0;
}

.lesson-course-search input::placeholder {
  color: var(--studio-footnote);
  opacity: 1;
}

.lesson-course-picker__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-content: start;
  gap: 24px 36px;
  padding: 24px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.lesson-course-picker__topic {
  min-width: 0;
}

.lesson-course-picker__topic > header {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--studio-line);
}

.lesson-course-picker__topic > header > span {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: var(--studio-yellow);
  border: 1px solid var(--studio-ink);
  border-radius: 10px;
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-heading);
}

.lesson-course-picker__topic h3 {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: var(--lesson-weight-heading);
  line-height: 1.2;
}

.lesson-course-picker__topic header p {
  margin: 2px 0 0;
  color: var(--studio-ink-soft);
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-label);
}

.lesson-course-picker__topic ol {
  display: grid;
  gap: 3px;
}

.lesson-course-picker__link {
  min-height: 46px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 24px;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--studio-ink);
  text-decoration: none;
}

.lesson-course-picker__link.is-current {
  background: var(--studio-yellow);
  border-color: var(--studio-ink);
}

.lesson-course-picker__link strong {
  min-width: 0;
  display: -webkit-box;
  overflow: hidden;
  font-size: 0.8125rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.25;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.lesson-course-picker__empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 48px 24px;
  color: var(--studio-ink-soft);
  font-size: 0.9375rem;
  text-align: center;
}

.lesson-course-pager {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: 18px;
  padding: 24px 36px;
  background: var(--studio-surface-soft);
  border-top: 1px solid var(--studio-line);
}

.lesson-course-pager__link {
  min-width: 0;
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--studio-ink);
  text-decoration: none;
}

.lesson-course-pager__link--next {
  justify-content: flex-end;
  text-align: right;
}

.lesson-course-pager__link > span[aria-hidden="true"] {
  font-size: 1.375rem;
}

.lesson-course-pager__link > span:not([aria-hidden]) {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.lesson-course-pager__link small {
  color: var(--studio-ink-soft);
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-label);
}

.lesson-course-pager__link strong {
  display: -webkit-box;
  overflow: hidden;
  font-size: 0.8125rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.25;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.lesson-course-pager > button {
  align-self: center;
  min-height: 48px;
  padding: 0 16px;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 12px;
  color: var(--studio-ink);
  cursor: pointer;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: var(--lesson-weight-label);
  transition:
    background var(--studio-motion-fast) var(--studio-ease-out),
    border-color var(--studio-motion-fast) var(--studio-ease-out),
    transform var(--studio-motion-fast) var(--studio-ease-out);
}

.lesson-course-switcher:active,
.lesson-course-rail__head button:active,
.lesson-course-picker__head button:active,
.lesson-course-pager > button:active {
  background: var(--studio-surface-cream);
  border-color: var(--studio-ink);
  transform: translateY(1px);
}

.lesson-document {
  background: #fff;
}

.lesson-document__hero {
  padding: 56px clamp(48px, 8vw, 116px) 48px;
  background: var(--studio-surface-warm);
  border-bottom: 1px solid var(--studio-line);
}

.lesson-document__hero > p:first-child {
  margin: 0 0 12px;
  color: var(--studio-red-ink);
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-heading);
}

.lesson-document__hero h1 {
  max-width: 22ch;
  margin: 0;
  font-size: clamp(2.75rem, 4.4vw, 3.75rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.04em;
  line-height: 0.98;
  text-wrap: balance;
}

.lesson-document__dek {
  max-width: 70ch;
  margin-top: 24px;
  color: var(--studio-ink-soft);
  font-size: 1.125rem;
  font-weight: var(--lesson-weight-body);
  line-height: 1.55;
  text-wrap: pretty;
}

.lesson-document__language-note {
  width: fit-content;
  margin: 24px 0 0;
  padding: 10px 12px;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 10px;
  color: var(--studio-ink-soft);
  font-size: 0.8125rem;
  line-height: 1.4;
}

.lesson-document__contents {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  padding: 24px clamp(48px, 8vw, 116px);
  border-bottom: 1px solid var(--studio-line);
}

.lesson-document__contents > strong {
  padding-top: 10px;
  font-size: 0.8125rem;
  font-weight: var(--lesson-weight-heading);
}

.lesson-document__contents ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.lesson-document__contents a {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  background: var(--studio-surface-soft);
  border: 1px solid var(--studio-line);
  border-radius: 10px;
  color: var(--studio-ink);
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.25;
  text-decoration: none;
}

.lesson-document__contents a span {
  color: var(--studio-red-ink);
  font-size: 0.625rem;
  font-variant-numeric: tabular-nums;
  font-weight: var(--lesson-weight-heading);
}

.lesson-document__body > section {
  scroll-margin-top: 96px;
  padding: 64px clamp(48px, 8vw, 116px);
  border-bottom: 1px solid var(--studio-line);
}

.lesson-document__body > section > h2,
.lesson-document__section-copy {
  width: min(100%, 820px);
  margin-right: auto;
  margin-left: auto;
}

.lesson-document__body > section > h2 {
  margin-top: 0;
  margin-bottom: 28px;
  font-size: 2.375rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.035em;
  line-height: 1.05;
  text-wrap: balance;
}

.lesson-document__section-copy {
  min-width: 0;
  color: var(--studio-ink);
  font-size: 1.0625rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.lesson-document__section-copy > :first-child {
  margin-top: 0;
}

.lesson-document__section-copy > :last-child {
  margin-bottom: 0;
}

.lesson-document__section-copy p,
.lesson-document__section-copy ul,
.lesson-document__section-copy pre,
.lesson-document__section-copy blockquote,
.lesson-document__section-copy .lecture-document__table-wrap {
  margin: 0 0 24px;
}

.lesson-document__section-copy ul {
  display: grid;
  gap: 10px;
  padding-left: 24px;
}

.lesson-document__section-copy h3 {
  margin: 36px 0 12px;
  font-size: 1.375rem;
  font-weight: var(--lesson-weight-heading);
  line-height: 1.2;
}

.lesson-document__section-copy code {
  padding: 0.12em 0.35em;
  background: var(--studio-paper);
  border-radius: 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.lesson-document__section-copy pre {
  min-width: 0;
  max-width: 100%;
  padding: 18px;
  overflow-x: auto;
  background: var(--studio-ink);
  border-radius: 12px;
  color: #fff;
  font-size: 0.875rem;
  line-height: 1.55;
}

.lesson-document__section-copy pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.guided-lesson-main pre > code {
  min-width: 0;
  display: block;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: normal;
}

.guided-lesson-main pre > code.hljs {
  background: transparent;
  color: var(--studio-paper);
}

.guided-lesson-main pre > code.hljs .hljs-comment,
.guided-lesson-main pre > code.hljs .hljs-quote,
.guided-lesson-main pre > code.hljs .hljs-meta {
  color: var(--studio-shadow-neutral);
}

.guided-lesson-main pre > code.hljs .hljs-keyword,
.guided-lesson-main pre > code.hljs .hljs-selector-tag,
.guided-lesson-main pre > code.hljs .hljs-attr,
.guided-lesson-main pre > code.hljs .hljs-attribute,
.guided-lesson-main pre > code.hljs .hljs-property {
  color: var(--studio-yellow);
}

.guided-lesson-main pre > code.hljs .hljs-string,
.guided-lesson-main pre > code.hljs .hljs-regexp,
.guided-lesson-main pre > code.hljs .hljs-template-tag {
  color: var(--studio-surface-red);
}

.guided-lesson-main pre > code.hljs .hljs-number,
.guided-lesson-main pre > code.hljs .hljs-literal,
.guided-lesson-main pre > code.hljs .hljs-symbol,
.guided-lesson-main pre > code.hljs .hljs-bullet {
  color: var(--studio-green);
}

.guided-lesson-main pre > code.hljs .hljs-title,
.guided-lesson-main pre > code.hljs .hljs-built_in,
.guided-lesson-main pre > code.hljs .hljs-type {
  color: var(--studio-surface-cream);
}

.guided-lesson-main pre > code.hljs .hljs-comment,
.guided-lesson-main pre > code.hljs .hljs-quote {
  font-style: italic;
}

.lesson-document__section-copy blockquote {
  padding: 18px 20px;
  background: var(--studio-surface-cream);
  border: 1px solid var(--studio-line);
  border-radius: 12px;
}

.lesson-document__section-copy blockquote p {
  margin: 0;
}

.lesson-document__section-copy .lecture-document__table-wrap {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--studio-line);
  border-radius: 12px;
}

.lesson-document__section-copy table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 0.875rem;
  line-height: 1.45;
}

.lesson-document__section-copy th,
.lesson-document__section-copy td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--studio-line);
  text-align: left;
  vertical-align: top;
}

.lesson-document__section-copy th {
  background: var(--studio-surface-soft);
  font-weight: var(--lesson-weight-heading);
}

.lesson-document__section-copy tr:last-child td {
  border-bottom: 0;
}

.lesson-document__finish {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 36px clamp(48px, 8vw, 116px);
  background: var(--studio-surface-cream);
}

.lesson-document__finish > div {
  max-width: 60ch;
}

.lesson-document__finish strong {
  font-size: 1.25rem;
  font-weight: var(--lesson-weight-heading);
}

.lesson-document__finish p {
  margin: 4px 0 0;
  color: var(--studio-ink-soft);
  font-size: 0.875rem;
  line-height: 1.45;
}

.lesson-hero {
  min-height: min(730px, calc(100vh - 78px));
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(440px, 0.95fr);
  align-items: stretch;
  border-bottom: 1px solid var(--studio-line);
}

.lesson-hero__copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(56px, 7vw, 112px);
}

.lesson-eyebrow {
  margin: 0 0 13px;
  color: var(--studio-red);
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.lesson-hero h1 {
  max-width: 800px;
  margin: 0;
  font-size: var(--lesson-type-display);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.04em;
  line-height: 0.98;
  text-wrap: balance;
}

.lesson-hero__intro {
  max-width: 720px;
  margin: 32px 0 0;
  color: var(--studio-ink-soft);
  font-size: clamp(1.125rem, 1.45vw, 1.5rem);
  font-weight: var(--lesson-weight-body);
  line-height: 1.45;
  text-wrap: pretty;
}

.lesson-goal {
  max-width: 720px;
  display: grid;
  grid-template-columns: 42px 1fr;
  align-items: center;
  gap: 14px;
  margin-top: 30px;
  padding: 17px 20px;
  background: var(--studio-surface-cream);
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
  box-shadow: 5px 5px 0 var(--studio-yellow);
}

.lesson-goal > span {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  border-radius: 50%;
  font-size: 1.375rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-goal p {
  margin: 0;
  font-size: var(--lesson-type-body);
  line-height: 1.5;
  text-wrap: pretty;
}

.lesson-goal strong {
  display: block;
  margin-bottom: 3px;
  color: var(--studio-red);
  font-size: var(--lesson-type-caption);
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lesson-hero__actions {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 34px;
}

.lesson-hero__actions > span {
  color: var(--studio-footnote);
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-label);
}

.lesson-primary-button,
.lesson-secondary-button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 0 22px;
  border: 2px solid var(--studio-ink);
  border-radius: 13px;
  cursor: pointer;
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-label);
  text-decoration: none;
  transition:
    transform var(--studio-motion-fast) var(--studio-ease-out),
    box-shadow var(--studio-motion-fast) var(--studio-ease-out),
    background var(--studio-motion-fast) ease-out;
}

.lesson-primary-button {
  background: var(--studio-yellow);
  box-shadow: 4px 4px 0 var(--studio-ink);
}

.lesson-secondary-button {
  background: #fff;
  box-shadow: 3px 3px 0 var(--studio-line);
}

.lesson-primary-button:not(:disabled):active,
.lesson-secondary-button:not(:disabled):active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--studio-ink);
}

.lesson-primary-button:disabled,
.lesson-secondary-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  box-shadow: none;
  transform: none;
}

.lesson-hero__visual {
  position: relative;
  min-width: 0;
  min-height: 610px;
  overflow: hidden;
  display: grid;
  place-items: center;
  background:
    radial-gradient(
      circle at 50% 40%,
      rgba(255, 255, 255, 0.82),
      transparent 40%
    ),
    var(--studio-yellow);
  border-left: 2px solid var(--studio-ink);
}

.lesson-hero__visual::before,
.lesson-hero__visual::after {
  content: "";
  position: absolute;
  border: 2px dashed rgba(20, 20, 20, 0.35);
  border-radius: 50%;
}

.lesson-hero__visual::before {
  width: 560px;
  height: 560px;
}

.lesson-hero__visual::after {
  width: 420px;
  height: 420px;
}

.lesson-hero__plane {
  position: absolute;
  top: 8%;
  right: -13%;
  z-index: 1;
  width: 78%;
  opacity: 0.88;
  transform: rotate(-8deg);
}

.lesson-hero__tag {
  position: relative;
  z-index: 3;
  width: min(84%, 560px);
  transform: rotate(-4deg);
  filter: drop-shadow(12px 16px 0 rgba(20, 20, 20, 0.18));
}

.lesson-hero__tag img {
  width: 100%;
  display: block;
}

.lesson-hero__tag > div {
  position: absolute;
  inset: 19% 10% 18% 36%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  transform: rotate(1deg);
}

.lesson-hero__tag span,
.lesson-hero__tag small {
  font-size: clamp(0.5625rem, 1vw, 0.875rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.09em;
}

.lesson-hero__tag strong {
  font-size: clamp(2.75rem, 5vw, 4.625rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.04em;
  line-height: 0.9;
}

.lesson-hero__visual > p {
  position: absolute;
  right: 34px;
  bottom: 26px;
  z-index: 4;
  margin: 0;
  padding: 8px 12px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-display);
  transform: rotate(2deg);
}

.lesson-hero__visual--scene {
  background: #f3dfb2;
}

.lesson-hero__visual--scene::before {
  inset: 0;
  z-index: 1;
  width: auto;
  height: auto;
  background:
    linear-gradient(
      180deg,
      rgba(255, 250, 220, 0.08),
      rgba(255, 232, 111, 0.28)
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.14), transparent 58%);
  border: 0;
  border-radius: 0;
}

.lesson-hero__visual--scene::after {
  display: none;
}

.lesson-hero__scene {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 52% center;
  filter: saturate(0.82) contrast(1.06);
}

.lesson-hero__tag--card {
  width: min(72%, 450px);
  padding: clamp(24px, 4vw, 46px);
  background: rgba(255, 255, 255, 0.94);
  border: 3px solid var(--studio-ink);
  border-radius: 16px;
  box-shadow: 12px 14px 0 var(--studio-ink);
  filter: none;
  transform: rotate(-3deg);
}

.lesson-hero__tag--card > div {
  position: static;
  gap: 8px;
  transform: none;
}

.lesson-hero__tag--card strong {
  color: var(--studio-red);
}

.lesson-journey {
  position: sticky;
  top: 78px;
  z-index: var(--lesson-layer-journey);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
  background: #fff;
  border-bottom: 1px solid var(--studio-line);
}

.lesson-journey ol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  list-style: none;
}

.lesson-journey li + li {
  border-left: 1px solid var(--studio-line);
}

.lesson-journey button {
  width: 100%;
  min-height: 68px;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
}

.lesson-journey button span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--studio-line);
  border-radius: 50%;
  color: var(--studio-footnote);
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-journey button strong {
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-label);
}

.lesson-journey button.is-active {
  background: var(--studio-surface-cream);
}

.lesson-journey button.is-active span {
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  color: var(--studio-ink);
}

.lesson-section {
  scroll-margin-top: 146px;
  padding: clamp(64px, 7vw, 96px) clamp(34px, 7vw, 104px);
  border-bottom: 1px solid var(--studio-line);
}

.lesson-section__header {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.55fr);
  align-items: end;
  gap: 50px;
  margin-bottom: 40px;
}

.lesson-section__header h2,
.lesson-takeaway h2 {
  max-width: 900px;
  margin: 0;
  font-size: var(--lesson-type-section-title);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.035em;
  line-height: 1.04;
  hyphens: none;
  overflow-wrap: normal;
  word-break: normal;
  text-wrap: balance;
}

.lesson-section__header > p {
  max-width: 70ch;
  margin: 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-lead);
  line-height: 1.55;
  text-wrap: pretty;
}

.lesson-failure-flow {
  display: grid;
  gap: 16px;
}

.lesson-failure-flow__header {
  display: grid;
  gap: 6px;
  padding-inline: 2px;
}

.lesson-failure-flow__header h3 {
  margin: 0;
  font-size: var(--lesson-type-subhead);
  font-weight: var(--lesson-weight-heading);
  letter-spacing: -0.02em;
}

.lesson-failure-flow__header p {
  max-width: 70ch;
  margin: 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  line-height: 1.55;
  text-wrap: pretty;
}

.provenance-demo {
  display: grid;
  grid-template-columns: minmax(260px, 1.35fr) 88px 176px 88px minmax(
      240px,
      0.9fr
    );
  align-items: center;
  gap: 16px;
  padding: 28px;
  background: var(--studio-paper);
  border: 1px solid var(--studio-line);
  border-radius: var(--studio-card-radius);
}

.provenance-demo__label {
  margin: 0 0 9px;
  color: var(--studio-footnote);
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.evidence-stack {
  display: grid;
  gap: 12px;
}

.evidence-card {
  padding: 16px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: 15px;
}

.evidence-card header {
  display: flex;
  align-items: center;
  gap: 9px;
}

.evidence-card header span {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  border-radius: 50%;
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-display);
}

.evidence-card header strong {
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.evidence-card > p {
  margin: 13px 0;
  font-size: 0.875rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.35;
}

.evidence-card footer {
  display: grid;
  gap: 5px;
}

.evidence-card__tag {
  width: fit-content;
  padding: 5px 8px;
  background: var(--studio-yellow);
  border: 1px solid var(--studio-ink);
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-display);
  transform: rotate(-1deg);
}

.evidence-card footer small {
  color: var(--studio-footnote);
  font-size: 0.5625rem;
  font-weight: var(--lesson-weight-label);
}

.pipeline-transfer {
  position: relative;
  min-height: 120px;
  display: grid;
  place-items: center;
}

.pipeline-transfer__line {
  position: absolute;
  width: 100%;
  height: 3px;
  background: var(--studio-ink);
}

.pipeline-transfer__line::after {
  content: "";
  position: absolute;
  right: -2px;
  top: -5px;
  width: 11px;
  height: 11px;
  border-top: 3px solid var(--studio-ink);
  /* impeccable-disable-next-line side-tab: this is the arrowhead, not a card accent */
  border-right: 3px solid var(--studio-ink);
  transform: rotate(45deg);
}

.pipeline-transfer__packet {
  position: absolute;
  top: 24px;
  z-index: 2;
  padding: 4px 7px;
  background: #fff;
  border: 1px solid var(--studio-ink);
  font-size: 0.5625rem;
  font-weight: var(--lesson-weight-display);
}

.pipeline-transfer__packet.is-lost {
  top: auto;
  bottom: 20px;
  background: #fff0ef;
  border-color: var(--studio-red);
  color: var(--studio-red-ink);
  text-decoration: line-through;
  transform: rotate(7deg);
}

.synthesis-machine {
  min-height: 188px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: var(--studio-ink);
  border: 2px solid var(--studio-ink);
  border-radius: 16px;
  box-shadow: 6px 6px 0 var(--studio-yellow-edge);
  color: #fff;
  text-align: center;
}

.synthesis-machine__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 10px;
  background: var(--studio-yellow);
  border-radius: 50%;
  color: var(--studio-ink);
  font-size: 1.625rem;
  font-weight: var(--lesson-weight-display);
}

.synthesis-machine strong {
  font-size: 0.875rem;
  font-weight: var(--lesson-weight-display);
}

.synthesis-machine p {
  margin: 5px 0 14px;
  color: #d6d3ca;
  font-size: 0.625rem;
  line-height: 1.35;
}

.broken-report {
  min-height: 210px;
  display: flex;
  flex-direction: column;
  padding: 20px;
  background: #fff;
  border: 3px solid var(--studio-red);
  border-radius: 16px;
  box-shadow: 6px 6px 0 var(--studio-shadow-danger);
  transform: rotate(1deg);
}

.broken-report header {
  display: flex;
  justify-content: space-between;
  color: var(--studio-red);
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.1em;
}

.broken-report header strong {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background: var(--studio-red);
  border-radius: 50%;
  color: #fff;
  font-size: 1rem;
}

.broken-report blockquote {
  margin: auto 0;
  font-size: 1.125rem;
  font-weight: var(--lesson-weight-heading);
  line-height: 1.3;
}

.broken-report > p {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--studio-red);
  color: var(--studio-red);
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-explanation {
  display: grid;
  grid-template-columns: 58px 1fr;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
  padding: 22px 26px;
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
}

.lesson-explanation--danger {
  background: #fff8f7;
  border-color: var(--studio-red);
}

.lesson-explanation__number {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  background: var(--studio-red);
  border-radius: 50%;
  color: #fff;
  font-size: 1.75rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-explanation h3 {
  margin: 0 0 4px;
  font-size: var(--lesson-type-subhead);
  font-weight: var(--lesson-weight-heading);
}

.lesson-explanation p {
  max-width: 70ch;
  margin: 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  line-height: 1.55;
  text-wrap: pretty;
}

.lesson-metaphor {
  position: relative;
  display: grid;
  grid-template-columns: minmax(320px, 0.72fr) minmax(560px, 1.28fr);
  align-items: center;
  gap: clamp(34px, 5vw, 76px);
  overflow: hidden;
  background: var(--studio-surface-muted);
}

.lesson-metaphor__copy,
.lesson-video-card {
  position: relative;
  z-index: 1;
}

.lesson-metaphor--copy-only {
  grid-template-columns: minmax(0, 720px);
  justify-content: center;
}

.lesson-video-standalone {
  display: grid;
  place-items: center;
  background: var(--studio-surface-muted);
}

.lesson-video-standalone .lesson-video-card {
  width: min(100%, 960px);
}

.lesson-metaphor h2 {
  max-width: 610px;
  margin: 0;
  font-size: var(--lesson-type-section-title);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.035em;
  line-height: 1.04;
  text-wrap: balance;
}

.lesson-metaphor__intro {
  max-width: 610px;
  margin: 24px 0 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-lead);
  font-weight: var(--lesson-weight-body);
  line-height: 1.5;
  text-wrap: pretty;
}

.lesson-metaphor__mapping {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 30px 0 0;
}

.lesson-metaphor__mapping > div {
  min-height: 112px;
  padding: 17px 18px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: 15px;
  box-shadow: 4px 4px 0 var(--studio-ink);
}

.lesson-metaphor__mapping > div:last-child {
  background: var(--studio-yellow);
  box-shadow: 4px 4px 0 var(--studio-yellow-edge);
}

.lesson-metaphor__mapping dt {
  color: var(--studio-footnote);
  font-size: 0.8125rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lesson-metaphor__mapping dd {
  margin: 10px 0 0;
  font-size: 1.125rem;
  font-weight: var(--lesson-weight-display);
  line-height: 1.2;
}

.lesson-video-card {
  min-width: 0;
  margin: 0;
}

.lesson-video-card__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #fff;
  border: 3px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
  box-shadow: 8px 8px 0 var(--studio-ink);
}

.lesson-video-card video {
  width: 100%;
  height: 100%;
  display: block;
  background: #fff;
  object-fit: cover;
}

.lesson-decision {
  background: var(--studio-surface-warm);
}

.lesson-question-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
  padding: 20px 24px;
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  border-radius: 16px;
  box-shadow: 5px 5px 0 var(--studio-ink);
}

.lesson-question-card p {
  margin: 0;
  font-size: clamp(1.125rem, 2vw, 1.6875rem);
  font-weight: var(--lesson-weight-heading);
  letter-spacing: -0.025em;
}

.lesson-question-card span {
  flex: 0 0 auto;
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.lesson-choice {
  min-height: 142px;
  display: grid;
  grid-template-columns: 48px 1fr 24px;
  align-items: start;
  gap: 15px;
  padding: 20px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
  box-shadow: 4px 4px 0 var(--studio-shadow-neutral);
  cursor: pointer;
  text-align: left;
  transition:
    transform var(--studio-motion-fast) var(--studio-ease-out),
    box-shadow var(--studio-motion-fast) var(--studio-ease-out),
    background var(--studio-motion-fast) ease-out;
}

.lesson-choice.is-selected {
  box-shadow: 6px 6px 0 var(--studio-ink);
  transform: translate(-2px, -2px);
}

.lesson-choice.is-correct {
  background: var(--studio-surface-green);
  border-color: var(--studio-green-ink);
}

.lesson-choice.is-wrong {
  background: #fff1ef;
  border-color: var(--studio-red);
}

.lesson-choice.is-selected.is-correct {
  box-shadow: 6px 6px 0 var(--studio-green);
}

.lesson-choice.is-selected.is-wrong {
  box-shadow: 6px 6px 0 var(--studio-shadow-danger);
}

.lesson-choice:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--studio-ink);
}

.lesson-choice__letter {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  background: var(--studio-paper);
  border: 2px solid var(--studio-ink);
  border-radius: 12px;
  font-size: 1.25rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-choice.is-correct .lesson-choice__letter {
  background: var(--studio-green);
}

.lesson-choice.is-wrong .lesson-choice__letter {
  background: var(--studio-red);
  color: #fff;
}

.lesson-choice__copy {
  display: grid;
  gap: 7px;
}

.lesson-choice__copy strong {
  font-size: var(--lesson-type-body);
  font-weight: var(--lesson-weight-heading);
  line-height: 1.35;
}

.lesson-choice__copy small {
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  font-weight: var(--lesson-weight-body);
  line-height: 1.5;
}

.lesson-choice__state {
  justify-self: end;
  font-size: 1.25rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-feedback {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  margin-top: 24px;
  padding: 26px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
  box-shadow: 6px 6px 0 var(--studio-ink);
}

.lesson-feedback[data-state="correct"] {
  background: var(--studio-surface-green);
  border-color: var(--studio-green-ink);
  box-shadow: 6px 6px 0 var(--studio-green);
}

.lesson-feedback[data-state="wrong"] {
  border-color: var(--studio-red);
  box-shadow: 6px 6px 0 var(--studio-shadow-danger);
}

.lesson-feedback__mark {
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  border-radius: 50%;
  font-size: 1.875rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-feedback[data-state="correct"] .lesson-feedback__mark {
  background: var(--studio-green);
  border-color: var(--studio-green-ink);
}

.lesson-feedback[data-state="wrong"] .lesson-feedback__mark {
  background: var(--studio-red);
  color: #fff;
}

.lesson-feedback h3 {
  margin: 0 0 7px;
  font-size: var(--lesson-type-subhead);
  font-weight: var(--lesson-weight-heading);
}

.lesson-feedback p {
  max-width: 70ch;
  margin: 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  line-height: 1.55;
  text-wrap: pretty;
}

.lesson-feedback__hint:empty {
  display: none;
}

.lesson-feedback__analogy {
  margin-top: 12px !important;
  padding-left: 12px;
  border-left: 3px solid currentColor;
  color: var(--studio-ink) !important;
  font-weight: var(--lesson-weight-label);
}

.lesson-feedback__hint {
  margin-top: 9px !important;
  color: var(--studio-red) !important;
  font-weight: var(--lesson-weight-heading);
}

.lesson-feedback__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.lesson-flow-toggle {
  align-self: end;
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--studio-paper);
  border-radius: 13px;
}

.lesson-flow-toggle button {
  min-height: 44px;
  padding: 0 16px;
  background: transparent;
  border: 2px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-label);
  transition:
    background 160ms ease-out,
    border-color 160ms ease-out,
    box-shadow 160ms cubic-bezier(0.22, 1, 0.36, 1);
}

.lesson-flow-toggle button.is-active {
  background: #fff;
  border-color: var(--studio-ink);
  box-shadow: 3px 3px 0 var(--studio-yellow-edge);
}

.lesson-solution.is-locked
  > :not(.lesson-section__header):not(.lesson-solution__lock-note) {
  display: none;
}

.lesson-solution.is-locked .lesson-flow-toggle {
  visibility: hidden;
}

.lesson-solution__lock-note {
  display: none;
}

.lesson-solution.is-locked .lesson-solution__lock-note {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  padding: 18px 22px;
  background: var(--studio-paper);
  border: 2px dashed var(--studio-line);
  border-radius: 13px;
  font-weight: var(--lesson-weight-heading);
}

.lesson-solution__lock-note p {
  margin: 0;
}

.lesson-flow-comparison {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 240px;
  padding: 28px;
  overflow-x: auto;
  background: var(--studio-paper);
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
}

.lesson-flow-comparison > .flow-node {
  flex: 1 0 150px;
}

.lesson-flow-comparison > .flow-arrow {
  flex: 0.8 0 120px;
}

.flow-node {
  min-height: 142px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 17px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-control-radius);
  text-align: center;
}

.flow-node > span {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin-bottom: 9px;
  background: var(--studio-paper);
  border: 2px solid var(--studio-ink);
  border-radius: 50%;
  font-size: 1rem;
  font-weight: var(--lesson-weight-display);
}

.flow-node strong {
  font-size: 1rem;
  font-weight: var(--lesson-weight-display);
}

.flow-node small {
  margin-top: 4px;
  color: var(--studio-ink-soft);
  font-size: 0.625rem;
  font-weight: var(--lesson-weight-label);
  line-height: 1.3;
}

.flow-node--dark {
  background: var(--studio-ink);
  color: #fff;
}

.flow-node--dark > span,
.flow-node--yellow > span {
  background: var(--studio-yellow);
  color: var(--studio-ink);
}

.flow-node--dark small {
  color: #ccc8bf;
}

.flow-node--danger {
  border-color: var(--studio-red);
}

.flow-node--danger > span {
  background: var(--studio-red);
  color: #fff;
}

.flow-node--yellow {
  background: #fffdeb;
}

.flow-node--success {
  background: var(--studio-surface-green);
  border-color: var(--studio-green-ink);
  box-shadow: 5px 5px 0 var(--studio-green);
}

.flow-node--success > span {
  background: var(--studio-green);
  border-color: var(--studio-green-ink);
}

.flow-arrow {
  position: relative;
  height: 3px;
  background: var(--studio-ink);
}

.flow-arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: -5px;
  width: 11px;
  height: 11px;
  border-top: 3px solid currentColor;
  border-right: 3px solid currentColor;
  transform: rotate(45deg);
}

.flow-arrow span {
  position: absolute;
  left: 50%;
  top: -34px;
  width: max-content;
  max-width: 150px;
  padding: 4px 7px;
  background: #fff;
  border: 1px solid var(--studio-ink);
  font-size: 0.5625rem;
  font-weight: var(--lesson-weight-display);
  text-align: center;
  transform: translateX(-50%) rotate(-1deg);
}

.flow-arrow--danger {
  background: var(--studio-red);
  color: var(--studio-red);
}

.flow-arrow--danger span {
  border-color: var(--studio-red);
  color: var(--studio-red);
}

.flow-arrow--safe {
  background: var(--studio-green-ink);
  color: var(--studio-green-ink);
}

.flow-arrow--safe span {
  background: var(--studio-surface-green);
  border-color: var(--studio-green-ink);
  color: var(--studio-green-ink);
}

.lesson-implementation-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: start;
  gap: 22px;
  margin-top: 28px;
}

.lesson-contract-card,
.verified-report-card {
  min-width: 0;
  padding: 26px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
  box-shadow: 6px 6px 0 var(--studio-shadow-neutral);
}

.lesson-contract-card header,
.verified-report-card header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.lesson-contract-card h3,
.verified-report-card h3 {
  margin: 0;
  font-size: var(--lesson-type-title);
  font-weight: var(--lesson-weight-heading);
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.lesson-contract-card header > span,
.verified-report-card header > span {
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  display: grid;
  place-items: center;
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  border-radius: 12px;
  font-size: 1.0625rem;
  font-weight: var(--lesson-weight-display);
}

.lesson-contract-card > p {
  max-width: 70ch;
  margin: 18px 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  line-height: 1.55;
}

.lesson-contract-card pre {
  min-width: 0;
  max-width: 100%;
  overflow: auto;
  margin: 0;
  padding: 20px;
  background: var(--studio-ink);
  border: 2px solid var(--studio-ink);
  border-radius: 14px;
  color: #f4efcf;
  font:
    var(--lesson-weight-body) 0.75rem/1.55 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  white-space: pre-wrap;
}

.verified-report-card {
  background: var(--studio-surface-green);
  box-shadow: 6px 6px 0 var(--studio-green);
}

.verified-report-card blockquote {
  margin: 24px 0 18px;
  padding: 17px 19px;
  background: #fff;
  border: 2px solid var(--studio-green-ink);
  border-radius: 12px;
  font-size: var(--lesson-type-lead);
  font-weight: var(--lesson-weight-heading);
  line-height: 1.4;
}

.verified-report-card .report-note {
  max-width: 70ch;
  margin: 0 0 16px;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  line-height: 1.55;
}

.verified-report-card ol {
  max-width: 70ch;
  display: grid;
  gap: 7px;
  margin: 0;
  padding-left: 22px;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  line-height: 1.5;
}

.report-invariant {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed var(--studio-line);
}

.report-invariant > p {
  margin: 0 0 11px;
  font-size: 0.6875rem;
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.report-invariant dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 0;
}

.report-invariant dl div {
  display: grid;
  gap: 3px;
  padding: 11px;
  background: #fff;
  border: 1px solid var(--studio-line);
  border-radius: 10px;
}

.report-invariant dt {
  color: var(--studio-footnote);
  font-size: 0.5625rem;
  font-weight: var(--lesson-weight-heading);
  text-transform: uppercase;
}

.report-invariant dd {
  margin: 0;
  font-size: 1.5rem;
  font-weight: var(--lesson-weight-display);
}

.report-invariant dl div:last-child dd {
  color: var(--studio-green-ink);
}

.lesson-takeaway {
  display: grid;
  grid-template-columns: minmax(360px, 0.8fr) minmax(0, 1.15fr);
  align-items: center;
  gap: clamp(48px, 7vw, 110px);
  background: var(--studio-surface-warm);
}

.lesson-takeaway > * {
  min-width: 0;
}

.lesson-takeaway--copy-only {
  grid-template-columns: minmax(0, 760px);
  justify-content: center;
}

.lesson-takeaway__visual {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: var(--studio-yellow);
  border: 2px solid var(--studio-ink);
  border-radius: 16px;
  box-shadow: 10px 10px 0 var(--studio-ink);
  transform: rotate(-1.5deg);
}

.lesson-takeaway__visual::before {
  content: "";
  position: absolute;
  width: 390px;
  height: 390px;
  border: 2px dashed rgba(20, 20, 20, 0.35);
  border-radius: 50%;
}

.lesson-takeaway__visual img {
  z-index: 1;
  width: 112%;
  max-width: none;
  transform: rotate(7deg);
  filter: drop-shadow(10px 14px 0 rgba(20, 20, 20, 0.16));
}

.lesson-takeaway__visual > div {
  position: absolute;
  z-index: 2;
  width: 58%;
  right: 7%;
  display: grid;
  gap: 4px;
  transform: rotate(5deg);
}

.lesson-takeaway__visual span,
.lesson-takeaway__visual small {
  font-size: clamp(0.5625rem, 1vw, 0.8125rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: 0.09em;
}

.lesson-takeaway__visual strong {
  font-size: clamp(1.5rem, 3vw, 2.875rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.035em;
}

.lesson-takeaway__visual--scene {
  background: #f3dfb2;
}

.lesson-takeaway__visual--scene::before {
  inset: 0;
  z-index: 1;
  width: auto;
  height: auto;
  background: linear-gradient(180deg, transparent 38%, rgba(20, 20, 20, 0.25));
  border: 0;
  border-radius: 0;
}

.lesson-takeaway__visual--scene img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: none;
  filter: saturate(0.78) contrast(1.06);
}

.lesson-takeaway__visual--scene > div {
  right: 7%;
  bottom: 7%;
  width: 78%;
  padding: 20px 22px;
  background: rgba(255, 255, 255, 0.94);
  border: 2px solid var(--studio-ink);
  border-radius: 16px;
  box-shadow: 6px 6px 0 var(--studio-ink);
  transform: rotate(1.5deg);
}

.lesson-takeaway__visual--scene strong {
  color: var(--studio-red);
  font-size: clamp(1.375rem, 2.5vw, 2.375rem);
}

.lesson-takeaway__copy
  > p:not(.lesson-eyebrow):not(.lesson-source):not(
    .lesson-takeaway__answer-summary
  ) {
  max-width: 70ch;
  margin: 24px 0 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-lead);
  line-height: 1.55;
  text-wrap: pretty;
}

.lesson-takeaway__copy blockquote {
  margin: 28px 0 0;
  padding: 22px 24px;
  background: #fff;
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
  box-shadow: 5px 5px 0 var(--studio-yellow);
}

.lesson-takeaway__copy blockquote strong {
  font-size: clamp(1.375rem, 2.2vw, 2.125rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.lesson-takeaway__principle {
  padding: 14px 16px;
  background: #fff8f7;
  border: 2px solid var(--studio-red);
  border-radius: 12px;
  font-weight: var(--lesson-weight-label);
}

.lesson-finish-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.lesson-completion-hint {
  flex: 0 0 100%;
  display: flex;
  align-items: flex-start;
  gap: 9px;
  max-width: 620px;
  margin: 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-body);
  font-weight: var(--lesson-weight-label);
  line-height: 1.5;
  text-wrap: pretty;
}

.lesson-completion-hint > span {
  color: var(--studio-red);
  font-size: 1.1875rem;
  font-weight: var(--lesson-weight-display);
  line-height: 1;
}

.lesson-primary-button.is-completed {
  background: var(--studio-green);
}

.lesson-source {
  margin: 20px 0 0;
  color: var(--studio-footnote);
  font:
    var(--lesson-weight-body) 0.625rem/1.4 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  word-break: break-word;
}

.lesson-source span {
  font-weight: var(--lesson-weight-display);
  text-transform: uppercase;
}

.lesson-toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: var(--lesson-layer-toast);
  max-width: min(360px, calc(100vw - 40px));
  padding: 13px 17px;
  background: var(--studio-ink);
  border: 2px solid var(--studio-ink);
  border-radius: 12px;
  box-shadow: 5px 5px 0 var(--studio-yellow);
  color: #fff;
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-heading);
  opacity: 0;
  pointer-events: none;
  transform: translateY(15px);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

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

/* Readability floor for supporting text across desktop and mobile. */
.lesson-hero__tag span,
.lesson-hero__tag small,
.lesson-takeaway__visual span,
.lesson-takeaway__visual small {
  font-size: var(--lesson-type-caption);
}

.lesson-hero__actions > span {
  font-size: var(--lesson-type-control);
}

.lesson-journey button strong,
.provenance-demo__label,
.evidence-card__tag,
.evidence-card footer small,
.pipeline-transfer__packet,
.synthesis-machine p,
.broken-report header,
.lesson-question-card span,
.flow-node small,
.flow-arrow span,
.report-invariant dt,
.lesson-source {
  font-size: var(--lesson-type-caption);
}

.evidence-card header strong,
.broken-report > p,
.lesson-toast {
  font-size: var(--lesson-type-meta);
}

.evidence-card > p,
.lesson-choice__copy small,
.lesson-contract-card > p,
.verified-report-card ol {
  font-size: var(--lesson-type-body);
}

.evidence-card > p {
  font-weight: var(--lesson-weight-body);
  line-height: 1.5;
}

@media (hover: hover) and (pointer: fine) {
  .lesson-course-switcher:hover,
  .lesson-course-rail__head button:hover,
  .lesson-course-picker__head button:hover,
  .lesson-course-pager > button:hover {
    background: var(--studio-surface-cream);
    border-color: var(--studio-ink);
  }

  .lesson-course-switcher:hover .lesson-course-switcher__chevron {
    background: var(--studio-yellow);
    border-color: var(--studio-ink);
    color: var(--studio-ink);
  }

  .lesson-course-rail__head button:hover {
    background: var(--studio-yellow);
    border-color: var(--studio-ink);
  }

  .lesson-course-topic summary:hover {
    background: var(--studio-surface-cream);
  }

  .lesson-course-link:hover {
    background: #fff;
    border-color: var(--studio-line);
    color: var(--studio-ink);
  }

  .lesson-course-picker__link:hover {
    background: var(--studio-surface-soft);
    border-color: var(--studio-line);
  }

  .lesson-course-pager__link:hover {
    background: #fff;
    border-color: var(--studio-line);
  }

  .lesson-primary-button:not(:disabled):hover,
  .lesson-secondary-button:not(:disabled):hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--studio-ink);
  }

  .lesson-journey button:hover,
  .lesson-flow-toggle button:hover {
    background: var(--studio-surface-cream);
  }

  .lesson-choice:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 var(--studio-ink);
  }

  .lesson-choice.is-correct:hover {
    box-shadow: 6px 6px 0 var(--studio-green);
  }

  .lesson-choice.is-wrong:hover {
    box-shadow: 6px 6px 0 var(--studio-shadow-danger);
  }
}

@media (max-width: 1120px) {
  .lesson-hero {
    grid-template-columns: 1fr 0.85fr;
  }

  .lesson-hero__copy {
    padding: 64px 46px;
  }

  .lesson-section__header {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    gap: 18px;
  }

  .provenance-demo {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .lesson-flow-comparison {
    flex-direction: column;
    gap: 24px;
    overflow-x: visible;
  }

  .lesson-flow-comparison > .flow-node,
  .lesson-flow-comparison > .flow-arrow {
    flex-basis: auto;
  }

  .lesson-flow-comparison > .flow-node,
  .lesson-flow-comparison > .flow-arrow {
    width: min(100%, 360px);
  }

  .provenance-demo {
    padding: 22px;
  }

  .pipeline-transfer {
    min-height: 72px;
  }

  .pipeline-transfer__line {
    width: 3px;
    height: 100%;
  }

  .pipeline-transfer__line::after {
    right: auto;
    left: -5px;
    top: auto;
    bottom: 1px;
    transform: rotate(135deg);
  }

  .pipeline-transfer__packet {
    top: 15px;
    left: calc(50% + 14px);
  }

  .pipeline-transfer__packet.is-lost {
    left: auto;
    right: calc(50% + 14px);
    bottom: 8px;
  }

  .synthesis-machine {
    width: min(100%, 360px);
    justify-self: center;
  }

  .lesson-metaphor {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .lesson-metaphor__copy {
    max-width: 720px;
  }

  .lesson-flow-comparison > .flow-node {
    width: min(100%, 360px);
    justify-self: center;
  }

  .lesson-flow-comparison > .flow-arrow {
    justify-self: center;
    width: 3px;
    height: 68px;
  }

  .flow-arrow::after {
    right: auto;
    left: -5px;
    top: auto;
    bottom: 0;
    transform: rotate(135deg);
  }

  .flow-arrow span {
    left: 20px;
    top: 50%;
    transform: translateY(-50%) rotate(-1deg);
  }
}

@media (min-width: 1121px) and (max-width: 1439px) {
  body.guided-lesson-theme {
    --lesson-type-display: clamp(4.375rem, 5vw, 4.5rem);
  }

  .guided-lesson-main {
    width: min(1240px, calc(100% - 40px));
  }

  .lesson-hero__copy {
    padding: clamp(64px, 5vw, 72px);
  }
}

@media (max-width: 1439px) {
  .lesson-topbar {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }
}

@media (max-width: 900px) {
  body.guided-lesson-theme {
    --lesson-type-display: clamp(3.25rem, 6.2vw, 3.5rem);
    --lesson-type-section-title: clamp(2.375rem, 4.2vw, 2.5rem);
  }

  .lesson-topbar {
    position: relative;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    padding: 10px 14px;
  }

  .lesson-brand {
    justify-self: start;
  }

  .lesson-brand__mark {
    width: 44px;
    height: 44px;
    flex-basis: 44px;
  }

  .lesson-topbar__progress {
    display: inline-flex;
    padding: 9px 12px;
  }

  .guided-lesson-main {
    width: 100%;
    border: 0;
  }

  .lesson-hero {
    min-height: 0;
    grid-template-columns: minmax(0, 1fr);
  }

  .lesson-hero__copy {
    padding: 54px 24px 44px;
  }

  .lesson-hero__intro {
    margin-top: 24px;
    font-size: var(--lesson-type-lead);
  }

  .lesson-hero__visual {
    min-height: 470px;
    border-top: 2px solid var(--studio-ink);
    border-left: 0;
  }

  .lesson-hero__tag {
    width: min(82%, 510px);
  }

  .lesson-journey {
    top: 0;
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .lesson-journey ol {
    min-width: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .lesson-journey button {
    min-height: 58px;
    padding: 8px 10px;
  }

  .lesson-journey button:focus-visible {
    outline-offset: -4px;
  }

  .lesson-section {
    scroll-margin-top: 90px;
    padding: 64px 22px;
  }

  .lesson-section__header {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
    margin-bottom: 34px;
  }

  .provenance-demo {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 22px;
  }

  .pipeline-transfer {
    min-height: 72px;
  }

  .pipeline-transfer__line {
    width: 3px;
    height: 100%;
  }

  .pipeline-transfer__line::after {
    right: auto;
    left: -5px;
    top: auto;
    bottom: 1px;
    transform: rotate(135deg);
  }

  .pipeline-transfer__packet {
    top: 15px;
    left: calc(50% + 14px);
  }

  .pipeline-transfer__packet.is-lost {
    left: auto;
    right: calc(50% + 14px);
    bottom: 8px;
  }

  .synthesis-machine {
    width: min(100%, 340px);
    justify-self: center;
  }

  .broken-report {
    min-height: 190px;
  }

  .lesson-metaphor {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .lesson-metaphor__copy {
    max-width: 720px;
  }

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

  .lesson-choice {
    min-height: 0;
  }

  .lesson-flow-toggle {
    justify-self: start;
  }

  .lesson-flow-comparison {
    gap: 28px;
  }

  .flow-node {
    width: min(100%, 360px);
    justify-self: center;
  }

  .flow-arrow {
    justify-self: center;
    width: 3px;
    height: 68px;
  }

  .flow-arrow::after {
    right: auto;
    left: -5px;
    top: auto;
    bottom: 0;
    transform: rotate(135deg);
  }

  .flow-arrow span {
    left: 20px;
    top: 50%;
    transform: translateY(-50%) rotate(-1deg);
  }

  .lesson-implementation-grid,
  .lesson-takeaway {
    grid-template-columns: 1fr;
  }

  .lesson-takeaway {
    gap: 58px;
  }

  .lesson-takeaway__visual {
    min-height: 440px;
    transform: none;
  }
}

@media (max-width: 560px) {
  body.guided-lesson-theme {
    --lesson-type-display: clamp(2.875rem, 13vw, 3.25rem);
    --lesson-type-section-title: clamp(2rem, 9.5vw, 2.375rem);
  }

  .lesson-topbar {
    gap: 8px;
    padding: 8px 10px;
  }

  .lesson-topbar__actions {
    gap: 8px;
  }

  .lesson-account__menu {
    inset: 62px 8px auto auto;
    width: min(320px, calc(100vw - 16px));
  }

  .lesson-brand {
    gap: 8px;
  }

  .lesson-brand__mark {
    width: 36px;
    height: 36px;
    flex-basis: 36px;
  }

  .lesson-brand strong {
    font-size: 1rem;
  }

  .lesson-topbar__progress {
    gap: 4px;
    padding: 7px 9px;
  }

  .lesson-topbar__progress span,
  .lesson-goal strong {
    font-size: var(--lesson-type-caption);
  }

  .lesson-hero__copy {
    padding: 32px 18px 28px;
  }

  .lesson-hero h1,
  .lesson-section__header h2,
  .lesson-takeaway h2 {
    overflow-wrap: anywhere;
    word-break: normal;
    hyphens: auto;
  }

  .lesson-goal {
    grid-template-columns: 36px 1fr;
    margin-top: 22px;
    padding: 14px;
  }

  .lesson-goal > span {
    width: 36px;
    height: 36px;
  }

  .lesson-hero__actions {
    align-items: center;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
  }

  .lesson-primary-button,
  .lesson-secondary-button {
    width: 100%;
    font-size: var(--lesson-type-control);
  }

  .lesson-hero__actions .lesson-primary-button {
    min-width: 190px;
    width: auto;
    flex: 1 1 auto;
    padding-right: 16px;
    padding-left: 16px;
  }

  .lesson-hero__actions > span {
    flex: 0 0 auto;
  }

  .lesson-hero__visual {
    min-height: 280px;
  }

  .lesson-hero__visual::before {
    width: 300px;
    height: 300px;
  }

  .lesson-hero__visual::after {
    width: 230px;
    height: 230px;
  }

  .lesson-hero__plane {
    width: 92%;
  }

  .lesson-section {
    scroll-margin-top: 60px;
    padding: 54px 16px;
  }

  .lesson-journey {
    position: static;
  }

  .lesson-journey ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lesson-journey button strong {
    font-size: 0.875rem;
    line-height: 1.2;
  }

  .lesson-journey li + li {
    border-left: 0;
  }

  .lesson-journey li {
    border-bottom: 1px solid var(--studio-line);
  }

  .lesson-journey li:nth-child(even) {
    border-left: 1px solid var(--studio-line);
  }

  .lesson-journey li:nth-child(n + 3) {
    border-bottom: 0;
  }

  .provenance-demo {
    padding: 14px;
    border-radius: var(--studio-card-radius);
  }

  .lesson-explanation,
  .lesson-feedback {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .lesson-explanation__number,
  .lesson-feedback__mark {
    width: 48px;
    height: 48px;
  }

  .lesson-question-card {
    align-items: flex-start;
    flex-direction: column;
    padding: 17px;
  }

  .lesson-metaphor__intro {
    font-size: var(--lesson-type-lead);
  }

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

  .lesson-metaphor__mapping > div {
    min-height: 0;
  }

  .lesson-video-card__frame {
    border-radius: 16px;
    box-shadow: 6px 6px 0 var(--studio-ink);
  }

  .lesson-choice {
    grid-template-columns: 42px 1fr;
    padding: 16px;
  }

  .lesson-choice__letter {
    width: 40px;
    height: 40px;
  }

  .lesson-choice__state {
    display: none;
  }

  .lesson-flow-toggle {
    min-width: 0;
    width: 100%;
  }

  .lesson-flow-toggle button {
    min-width: 0;
    flex: 1;
    padding: 0 8px;
    line-height: 1.2;
  }

  .flow-arrow span {
    left: 50%;
    right: auto;
    transform: translate(-50%, -50%) rotate(-1deg);
  }

  .lesson-flow-comparison,
  .lesson-contract-card,
  .verified-report-card {
    padding: 17px;
  }

  .lesson-contract-card header,
  .verified-report-card header {
    flex-direction: column-reverse;
    gap: 12px;
  }

  .report-invariant dl {
    grid-template-columns: 1fr;
  }

  .lesson-takeaway__visual {
    min-height: 350px;
    border-radius: 16px;
  }

  .lesson-finish-actions {
    align-items: stretch;
  }

  .lesson-source {
    font-size: 0.875rem;
  }
}

@media (min-width: 1440px) {
  body.guided-lesson-theme {
    --lesson-type-display: clamp(3.25rem, 5vw, 4.5rem);
  }

  .lesson-shell {
    display: grid;
    grid-template-columns: var(--lesson-rail-width) minmax(0, 1fr);
    align-items: stretch;
  }

  body.course-rail-collapsed .lesson-shell {
    grid-template-columns:
      var(--lesson-rail-collapsed-width)
      minmax(0, 1fr);
  }

  .lesson-course-rail {
    min-width: 0;
    height: calc(100dvh - var(--lesson-topbar-height));
    align-self: start;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
    background: var(--studio-surface-soft);
    border-right: 1px solid var(--studio-line);
    border-left: 1px solid var(--studio-line);
    position: sticky;
    top: var(--lesson-topbar-height);
    z-index: var(--lesson-layer-rail);
  }

  .lesson-course-rail nav {
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .guided-lesson-main {
    width: 100%;
    margin: 0;
    border-left: 0;
  }

  .lesson-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(400px, 0.95fr);
  }

  .lesson-hero__copy {
    padding: 64px;
  }

  .lesson-section {
    padding-right: 64px;
    padding-left: 64px;
  }

  body.course-rail-collapsed .lesson-topbar {
    grid-template-columns:
      var(--lesson-rail-collapsed-width)
      minmax(320px, 1fr)
      auto;
  }

  body.course-rail-collapsed .lesson-brand {
    justify-content: center;
  }

  body.course-rail-collapsed .lesson-brand strong,
  body.course-rail-collapsed .lesson-course-rail__head > div,
  body.course-rail-collapsed .lesson-course-topic__copy,
  body.course-rail-collapsed .lesson-course-topic__chevron,
  body.course-rail-collapsed .lesson-course-topic ol {
    display: none;
  }

  body.course-rail-collapsed .lesson-brand__mark {
    width: 44px;
    height: 44px;
    flex-basis: 44px;
  }

  body.course-rail-collapsed .lesson-course-rail__head {
    min-height: 0;
    justify-content: center;
    padding: 14px;
  }

  body.course-rail-collapsed .lesson-course-rail__toggle-icon svg {
    transform: rotate(-90deg);
  }

  body.course-rail-collapsed .lesson-course-rail,
  body.course-rail-collapsed .lesson-course-rail nav {
    overflow: visible;
  }

  body.course-rail-collapsed .lesson-course-rail nav {
    padding: 12px 8px;
  }

  body.course-rail-collapsed .lesson-course-topic summary {
    position: relative;
    grid-template-columns: 1fr;
    justify-items: center;
    padding: 7px 0;
  }

  body.course-rail-collapsed .lesson-course-topic summary::after {
    content: attr(aria-label);
    position: absolute;
    left: calc(100% + 10px);
    top: 50%;
    z-index: var(--lesson-layer-topbar);
    width: max-content;
    max-width: 240px;
    padding: 8px 10px;
    background: var(--studio-ink);
    border-radius: 8px;
    color: #fff;
    font-size: 0.75rem;
    font-weight: var(--lesson-weight-label);
    line-height: 1.25;
    opacity: 0;
    pointer-events: none;
    transform: translate(-4px, -50%);
    transition:
      opacity var(--studio-motion-fast) var(--studio-ease-out),
      transform var(--studio-motion-fast) var(--studio-ease-out);
  }

  body.course-rail-collapsed .lesson-course-topic summary:hover::after,
  body.course-rail-collapsed .lesson-course-topic summary:focus-visible::after {
    opacity: 1;
    transform: translate(0, -50%);
  }

  body.course-rail-collapsed .lesson-course-topic__mark {
    width: 40px;
    height: 40px;
  }

}

@media (max-width: 900px) {
  .lesson-topbar {
    position: sticky;
    grid-template-columns: 44px minmax(0, 1fr) auto;
    gap: 8px;
    padding: 8px 10px;
  }

  .lesson-journey {
    top: 78px;
  }

  .lesson-brand {
    min-height: 44px;
  }

  .lesson-brand strong {
    display: none;
  }

  .lesson-brand__mark {
    width: 44px;
    height: 44px;
    flex-basis: 44px;
  }

  .lesson-course-switcher {
    min-height: 48px;
    column-gap: 8px;
    padding: 6px 7px 6px 11px;
  }

  .lesson-course-switcher__copy > span {
    font-size: var(--lesson-type-caption);
  }

  .lesson-course-switcher__copy strong {
    font-size: var(--lesson-type-meta);
  }

  .lesson-course-picker {
    width: 100%;
    height: 100dvh;
    max-height: none;
    margin: 0;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .lesson-course-picker__panel {
    height: 100dvh;
    max-height: none;
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }

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

  .lesson-course-pager {
    padding: 18px;
  }

  .lesson-document__hero {
    padding: 54px 24px 48px;
  }

  .lesson-document__hero h1 {
    font-size: clamp(2.625rem, 8vw, 3.75rem);
  }

  .lesson-document__contents {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 22px 24px;
  }

  .lesson-document__contents > strong {
    padding-top: 0;
  }

  .lesson-document__body > section {
    padding: 54px 24px;
  }

  .lesson-document__finish {
    padding: 32px 24px;
  }
}

@media (max-width: 560px) {
  .lesson-topbar {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .lesson-brand {
    display: none;
  }

  .lesson-course-switcher__copy > span {
    display: none;
  }

  .lesson-course-switcher__copy strong {
    font-size: var(--lesson-type-meta);
  }

  .lesson-course-picker__head {
    gap: 12px;
    padding: 18px 16px;
  }

  .lesson-course-picker__head h2 {
    font-size: 1.5625rem;
  }

  .lesson-course-picker__head p {
    font-size: 0.8125rem;
  }

  .lesson-course-search {
    padding: 14px 16px;
  }

  .lesson-course-picker__list {
    gap: 24px;
    padding: 18px 16px 32px;
  }

  .lesson-course-picker__link {
    min-height: 50px;
  }

  .lesson-course-pager {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
  }

  .lesson-course-pager > button {
    order: -1;
    width: 100%;
  }

  .lesson-course-pager__link {
    width: 100%;
  }

  .lesson-course-pager__spacer {
    display: none;
  }

  .lesson-document__hero {
    padding: 40px 18px 36px;
  }

  .lesson-document__hero h1 {
    font-size: 2.25rem;
  }

  .lesson-document__dek {
    font-size: 1.0625rem;
  }

  .lesson-document__contents {
    padding: 20px 18px;
  }

  .lesson-document__contents ol {
    display: grid;
  }

  .lesson-document__contents a {
    width: 100%;
    min-height: 44px;
  }

  .lesson-document__body > section {
    scroll-margin-top: 78px;
    padding: 46px 18px;
  }

  .lesson-document__body > section > h2 {
    margin-bottom: 22px;
    font-size: 2rem;
  }

  .lesson-document__section-copy {
    font-size: 1rem;
  }

  .lesson-document__section-copy h3 {
    font-size: 1.25rem;
  }

  .lesson-document__finish {
    align-items: stretch;
    flex-direction: column;
    padding: 28px 18px;
  }
}

.lesson-course-link__lock,
.lesson-course-picker__lock {
  width: 18px;
  height: 18px;
  display: block;
  color: var(--studio-footnote);
  fill: none;
}

.lesson-course-link.is-locked .lesson-course-link__state,
.lesson-course-picker__link.is-locked .lesson-course-picker__state {
  display: none;
}

.lesson-course-link.is-locked:not(.is-current),
.lesson-course-picker__link.is-locked:not(.is-current) {
  color: var(--studio-footnote);
}

.lesson-paywall-main {
  min-height: calc(100dvh - var(--lesson-topbar-height));
  display: grid;
  align-items: stretch;
}

.lesson-paywall {
  min-height: inherit;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(380px, 1.05fr);
  align-items: center;
  gap: clamp(36px, 5vw, 82px);
  padding: clamp(52px, 7vw, 108px) clamp(32px, 6vw, 92px);
  background: #fff;
}

.lesson-paywall__copy {
  min-width: 0;
  max-width: 680px;
}

.lesson-paywall__lesson {
  display: grid;
  gap: 6px;
  margin: 18px 0 0;
  color: var(--studio-ink-soft);
}

.lesson-paywall__lesson span {
  font-size: var(--lesson-type-caption);
  font-weight: var(--lesson-weight-label);
}

.lesson-paywall__lesson strong {
  color: var(--studio-ink);
  font-size: var(--lesson-type-lead);
  font-weight: var(--lesson-weight-heading);
  line-height: 1.3;
}

.lesson-paywall h1 {
  max-width: 12ch;
  margin: 22px 0 16px;
  font-size: clamp(2.75rem, 5vw, 5.25rem);
  font-weight: var(--lesson-weight-display);
  letter-spacing: -0.055em;
  line-height: 0.96;
}

.lesson-paywall__intro {
  max-width: 58ch;
  margin: 0;
  color: var(--studio-ink-soft);
  font-size: var(--lesson-type-lead);
  line-height: 1.55;
}

.lesson-paywall__included {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--studio-line);
}

.lesson-paywall__included > strong {
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-heading);
}

.lesson-paywall__included ul {
  display: grid;
  gap: 11px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.lesson-paywall__included li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  color: var(--studio-ink-soft);
  line-height: 1.45;
}

.lesson-paywall__included li span {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  background: var(--studio-yellow);
  border: 1px solid var(--studio-ink);
  border-radius: 50%;
  color: var(--studio-ink);
  font-size: 0.75rem;
  font-weight: var(--lesson-weight-heading);
}

.lesson-paywall__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.lesson-paywall__notice {
  margin: 22px 0 0;
  padding: 14px 16px;
  background: var(--studio-surface-cream);
  border: 1px solid var(--studio-line);
  border-radius: 12px;
  line-height: 1.45;
}

.lesson-paywall__notice--warning {
  background: var(--studio-surface-red);
  border-color: var(--studio-red);
}

.lesson-paywall__auth-note,
.lesson-paywall__status {
  min-height: 1.4em;
  margin: 14px 0 0;
  color: var(--studio-footnote);
  font-size: var(--lesson-type-meta);
  line-height: 1.45;
}

.lesson-paywall__free-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  color: var(--studio-ink);
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-label);
  text-underline-offset: 3px;
}

.lesson-paywall__visual {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  background: var(--studio-surface-cream);
  border: 2px solid var(--studio-ink);
  border-radius: var(--studio-card-radius);
  box-shadow: 10px 10px 0 var(--studio-yellow);
}

.lesson-paywall__visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
}

.lesson-paywall__visual figcaption {
  padding: 16px 18px;
  border-top: 1px solid var(--studio-line);
  font-size: var(--lesson-type-control);
  font-weight: var(--lesson-weight-heading);
  line-height: 1.35;
}

@media (max-width: 980px) {
  .lesson-paywall {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .lesson-paywall__visual {
    grid-row: 1;
  }
}

@media (max-width: 640px) {
  .lesson-paywall {
    gap: 34px;
    padding: 34px 18px 56px;
  }

  .lesson-paywall h1 {
    font-size: clamp(2.5rem, 13vw, 3.75rem);
  }

  .lesson-paywall__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .lesson-paywall__actions > * {
    width: 100%;
  }

  .lesson-paywall__visual {
    border-radius: 13px;
    box-shadow: 6px 6px 0 var(--studio-yellow);
  }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-course-switcher,
  .lesson-course-switcher__chevron,
  .lesson-course-switcher__chevron svg,
  .lesson-course-rail__head button,
  .lesson-course-rail__toggle-icon svg,
  .lesson-course-picker__head button,
  .lesson-course-pager > button,
  .lesson-account__trigger,
  .lesson-course-topic__chevron,
  .lesson-course-progress__track i,
  body.course-rail-collapsed .lesson-course-topic summary::after,
  .lesson-primary-button,
  .lesson-secondary-button,
  .lesson-choice,
  .lesson-toast {
    transition: none;
  }

  .lesson-primary-button:hover,
  .lesson-secondary-button:hover,
  .lesson-primary-button:active,
  .lesson-secondary-button:active,
  .lesson-choice:hover,
  .lesson-choice:active,
  .lesson-choice.is-selected {
    transform: none;
  }

  .lesson-account__trigger:active {
    transform: none;
  }
}