.lesson-page-v9 {
  --lesson-bg: #f7f7f5;
  --lesson-surface: #ffffff;
  --lesson-ink: #1c2430;
  --lesson-muted: #697280;
  --lesson-subtle: #9299a3;
  --lesson-line: #e3e5e7;
  --lesson-line-strong: #d3d7dc;
  --lesson-accent: #315f8d;
  --lesson-accent-dark: #24496d;
  --lesson-accent-soft: #edf3f8;
  --lesson-success: #38745c;
  --lesson-radius-sm: .5rem;
  --lesson-radius-md: .75rem;
  --lesson-radius-lg: 1rem;
  --lesson-space-xs: .35rem;
  --lesson-space-sm: .65rem;
  --lesson-space-md: 1rem;
  --lesson-space-lg: 1.5rem;
  --lesson-space-xl: 2.25rem;
  --lesson-space-2xl: 3.25rem;
  --lesson-content: 86rem;
  min-height: 100vh;
  color: var(--lesson-ink);
  background: var(--lesson-bg);
}

.lesson-page-v9 *,
.lesson-page-v9 *::before,
.lesson-page-v9 *::after { box-sizing: border-box; }

.lesson-reading-progress {
  position: sticky;
  top: 0;
  z-index: 38;
  height: 2px;
  background: transparent;
  pointer-events: none;
}

.lesson-reading-progress > span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--lesson-accent);
  transition: width 80ms linear;
}

.lesson-course-header {
  border-bottom: 1px solid var(--lesson-line);
  background: rgba(247, 247, 245, .96);
  backdrop-filter: blur(12px);
}

.lesson-course-header__main {
  width: min(100%, var(--lesson-content));
  margin-inline: auto;
  padding: clamp(1.1rem, 3vw, 2rem) clamp(1rem, 3vw, 2rem);
}

.lesson-breadcrumbs {
  display: flex;
  align-items: center;
  gap: .45rem;
  min-width: 0;
  color: var(--lesson-muted);
  font-size: .78rem;
}

.lesson-breadcrumbs a {
  color: var(--lesson-accent-dark);
  font-weight: 700;
}

.lesson-breadcrumbs a:hover { text-decoration: underline; text-underline-offset: 3px; }

.lesson-course-title-row {
  display: grid;
  gap: var(--lesson-space-md);
  margin-top: .8rem;
}

.lesson-module-label,
.lesson-section-label {
  display: block;
  color: var(--lesson-muted);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.lesson-course-title-row h1 {
  max-width: 28ch;
  margin: .25rem 0 0;
  font-size: clamp(1.55rem, 4vw, 2.35rem);
  line-height: 1.08;
  letter-spacing: -.035em;
  overflow-wrap: anywhere;
}

.lesson-mastery {
  width: min(100%, 17rem);
  padding: .85rem 0 0;
  border-top: 1px solid var(--lesson-line);
}

.lesson-mastery > span {
  color: var(--lesson-muted);
  font-size: .72rem;
}

.lesson-mastery > strong {
  float: right;
  font-size: .82rem;
}

.lesson-mastery__bar {
  height: 4px;
  margin-top: .55rem;
  overflow: hidden;
  border-radius: 999px;
  background: #e4e7ea;
}

.lesson-mastery__bar > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--lesson-success);
}

.lesson-outline-mobile {
  margin: 1rem;
  border: 1px solid var(--lesson-line);
  border-radius: var(--lesson-radius-md);
  background: var(--lesson-surface);
}

.lesson-outline-mobile summary {
  position: relative;
  display: grid;
  gap: .15rem;
  padding: .85rem 2.5rem .85rem 1rem;
  cursor: pointer;
  list-style: none;
}

.lesson-outline-mobile summary::-webkit-details-marker { display: none; }
.lesson-outline-mobile summary::after {
  content: "⌄";
  position: absolute;
  right: 1rem;
  top: 50%;
  color: var(--lesson-muted);
  transform: translateY(-50%);
  transition: transform 160ms ease;
}
.lesson-outline-mobile[open] summary::after { transform: translateY(-50%) rotate(180deg); }
.lesson-outline-mobile summary > span { color: var(--lesson-muted); font-size: .7rem; }
.lesson-outline-mobile summary > strong { font-size: .9rem; overflow-wrap: anywhere; }
.lesson-outline-mobile nav { border-top: 1px solid var(--lesson-line); }
.lesson-outline-mobile ol { margin: 0; padding: .4rem; list-style: none; }
.lesson-outline-mobile li + li { margin-top: .15rem; }
.lesson-outline-mobile a {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: .5rem;
  align-items: start;
  padding: .65rem;
  border-radius: .45rem;
  color: var(--lesson-muted);
}
.lesson-outline-mobile a[aria-current="page"] { background: var(--lesson-accent-soft); color: var(--lesson-accent-dark); }
.lesson-outline-mobile a span { font-size: .68rem; font-variant-numeric: tabular-nums; }
.lesson-outline-mobile a b { font-size: .8rem; line-height: 1.35; }

.lesson-shell-v9 {
  width: min(100%, var(--lesson-content));
  margin-inline: auto;
  padding: 0 clamp(1rem, 3vw, 2rem) clamp(4rem, 8vw, 7rem);
}

.lesson-syllabus,
.lesson-tools { display: none; }

.lesson-reader {
  min-width: 0;
  padding-top: clamp(1.6rem, 4vw, 3rem);
}

.lesson-reader__header {
  max-width: 48rem;
  padding-bottom: clamp(1.8rem, 5vw, 3.25rem);
  border-bottom: 1px solid var(--lesson-line);
}

.lesson-reader__meta {
  display: flex;
  gap: .4rem;
  align-items: center;
  color: var(--lesson-subtle);
  font-size: .72rem;
  font-weight: 700;
}

.lesson-reader__header h2 {
  margin: .65rem 0 .8rem;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: .98;
  letter-spacing: -.055em;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

.lesson-reader__header > p {
  max-width: 43rem;
  margin: 0;
  color: #4f5966;
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.75;
}

.lesson-reader > section {
  scroll-margin-top: 1rem;
  padding-block: clamp(2.2rem, 6vw, 4rem);
  border-bottom: 1px solid var(--lesson-line);
}

.lesson-section-heading {
  display: grid;
  gap: .55rem;
  margin-bottom: 1.2rem;
}

.lesson-section-heading h3,
.lesson-ai h3,
.lesson-finish h3 {
  margin: .25rem 0 0;
  font-size: clamp(1.45rem, 3.8vw, 2.05rem);
  line-height: 1.12;
  letter-spacing: -.035em;
  text-wrap: balance;
}

.lesson-section-heading > p {
  max-width: 37rem;
  margin: 0;
  color: var(--lesson-muted);
  font-size: .9rem;
  line-height: 1.65;
}

.lesson-visual__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--lesson-line);
  border-radius: var(--lesson-radius-lg);
  background: #fff;
}

.lesson-visual__open {
  position: relative;
  display: grid;
  place-items: center;
  padding: 1.25rem 1rem 3rem;
  cursor: zoom-in;
  background: #fff;
}
.lesson-visual__open:focus-visible { outline-offset: -4px; }
.lesson-visual__open > img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 36rem;
  object-fit: contain;
  background: #fff;
}
.lesson-visual__zoom { position: absolute; bottom: .75rem; right: 1rem; color: #596778; font-size: .74rem; text-decoration: underline; text-underline-offset: .2em; }
.lesson-visual__open:hover .lesson-visual__zoom { color: var(--lesson-accent-dark); }

.lesson-visual__figure figcaption {
  display: grid;
  gap: .25rem;
  padding: .8rem 1rem;
  border-top: 1px solid var(--lesson-line);
  background: #fff;
}

.lesson-visual__figure figcaption > .media-caption { font-size: .85rem; font-weight: 750; }
.lesson-visual__figure .lesson-visual__note { margin: .2rem 0 .3rem; max-width: 65ch; color: var(--lesson-muted); font-size: .82rem; line-height: 1.65; }
.lesson-visual__figure figcaption a { width: fit-content; color: var(--lesson-muted); font-size: .68rem; }
.lesson-visual__figure figcaption a:hover { color: var(--lesson-accent-dark); text-decoration: underline; text-underline-offset: 3px; }
.lesson-visual__fallback { display: none; min-height: 8rem; margin: 0; padding: 1.5rem; background: #fff; text-align: center; }
.lesson-visual__figure.media-error > .lesson-visual__open,
.lesson-visual__figure.media-error > figcaption { display: none; }
.lesson-visual__figure.media-error > .lesson-visual__fallback { display: grid; place-items: center; }
.lesson-visual__fallback .scene-svg { width: min(100%, 34rem); height: auto; }

body.image-viewer-open { overflow: hidden; }
.image-viewer { width: min(72rem, calc(100vw - 2rem)); max-width: none; max-height: calc(100dvh - 2rem); padding: 0; border: 1px solid #d6dce3; border-radius: .85rem; background: white; color: #172231; box-shadow: 0 1.5rem 5rem #11182730; }
.image-viewer::backdrop { background: #15202ed6; }
.image-viewer__header { display: flex; flex-wrap: wrap; gap: .7rem; align-items: center; padding: .8rem 1rem; border-bottom: 1px solid #e3e7ec; }
.image-viewer__header h2 { flex: 1 1 14rem; margin: 0; font-size: 1rem; line-height: 1.4; }
.image-viewer__header button { min-height: 2.5rem; padding: .4rem .75rem; border: 1px solid #d7dce3; border-radius: .5rem; background: white; font-size: .8rem; color: #263345; }
.image-viewer__viewport { max-height: calc(100dvh - 10rem); overflow: auto; padding: 1rem; background: #fff; overscroll-behavior: contain; }
.image-viewer__viewport img { display: block; width: 100%; max-width: 100%; height: auto; max-height: calc(100dvh - 13rem); margin: auto; object-fit: contain; }
.image-viewer.is-zoomed .image-viewer__viewport img { width: var(--image-zoom-width, 1600px); max-width: none; max-height: none; margin: 0; }
.image-viewer__error { margin: 0; padding: 2rem; text-align: center; }
.image-viewer__error[hidden] { display: none; }
.image-viewer__hint { margin: 0; padding: .5rem 1rem .8rem; color: #667183; font-size: .75rem; }

.lesson-core__grid { display: grid; gap: 1rem; }
.lesson-core__explanation {
  font-size: 1rem;
  line-height: 1.78;
}
.lesson-core__explanation > p { margin: 0; }
.lesson-core__explanation > p + p { margin-top: 1rem; }
.lesson-context {
  padding-left: 1rem;
  border-left: 2px solid #a8bccf;
  color: var(--lesson-muted);
}

.lesson-skill-note {
  align-self: start;
  padding: 1rem;
  border: 1px solid var(--lesson-line);
  border-radius: var(--lesson-radius-md);
  background: #fbfbfa;
}
.lesson-skill-note > span { color: var(--lesson-muted); font-size: .7rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; }
.lesson-skill-note ul { margin: .75rem 0 0; padding-left: 1.1rem; }
.lesson-skill-note li { color: #505965; font-size: .82rem; line-height: 1.55; }
.lesson-skill-note li + li { margin-top: .4rem; }

.lesson-formula-list { display: grid; gap: .8rem; }
.lesson-formula {
  margin: 0;
  padding: clamp(1rem, 3vw, 1.35rem);
  border: 1px solid var(--lesson-line);
  border-radius: var(--lesson-radius-lg);
  background: var(--lesson-surface);
}
.lesson-formula::before { display: none !important; }
.lesson-formula__topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: .6rem;
}
.lesson-formula__topline > span {
  color: var(--lesson-subtle);
  font-size: .7rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.lesson-formula__copy {
  border: 0;
  border-bottom: 1px solid transparent;
  background: transparent;
  color: var(--lesson-muted);
  padding: .2rem 0;
  font-size: .7rem;
  font-weight: 700;
}
.lesson-formula__copy:hover { color: var(--lesson-accent-dark); border-bottom-color: currentColor; }
.lesson-formula__copy[data-copied="true"] { color: var(--lesson-success); }
.lesson-formula__equation {
  min-height: 7.75rem;
  display: grid;
  place-items: center;
  overflow-x: auto;
  padding: 1.25rem;
  border-radius: .65rem;
  background: #f2f4f5;
}
.lesson-formula__equation .pretty-math {
  margin: 0;
  padding: 0;
  background: transparent !important;
  box-shadow: none !important;
  color: #171c24 !important;
  font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif;
  font-size: clamp(2rem, 7vw, 3.25rem);
  line-height: 1.2;
  white-space: nowrap;
}
.lesson-formula__equation .math-var,
.lesson-formula__equation .math-eq-op,
.lesson-formula__equation .math-dot,
.lesson-formula__equation .math-note { color: inherit !important; }
.lesson-formula__equation .math-frac > .math-num { border-bottom-color: #171c24 !important; }
.lesson-formula__legend {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .8rem;
  margin-top: .8rem;
}
.lesson-formula__legend > span {
  display: inline-flex;
  gap: .35rem;
  align-items: baseline;
  border: 0 !important;
  background: transparent !important;
  padding: 0 !important;
  color: var(--lesson-muted);
  font-size: .72rem;
}
.lesson-formula__legend b { color: var(--lesson-ink); font-family: "Cambria Math", "Times New Roman", serif; font-size: .9rem; }
.lesson-formula__legend em { font-style: normal; }

.lesson-method__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--lesson-line);
}
.lesson-method__steps li {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: .8rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--lesson-line);
}
.lesson-method__steps li > span {
  color: var(--lesson-subtle);
  font-size: .72rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.lesson-method__steps b { display: block; font-size: .9rem; }
.lesson-method__steps p { margin: .25rem 0 0; color: var(--lesson-muted); font-size: .82rem; line-height: 1.55; }

.lesson-ai {
  margin-block: clamp(2.4rem, 6vw, 4.5rem);
  padding: clamp(1rem, 3vw, 1.5rem) !important;
  border: 1px solid #cfd9e2 !important;
  border-radius: var(--lesson-radius-lg);
  background: #f7fafc;
}
.lesson-ai__heading {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: .8rem;
  align-items: start;
}
.lesson-ai__mark {
  width: 2.15rem;
  height: 2.15rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #dfeaf3;
  color: var(--lesson-accent-dark);
  font-weight: 900;
}
.lesson-ai__heading p { max-width: 43rem; margin: .45rem 0 0; color: var(--lesson-muted); font-size: .84rem; line-height: 1.6; }
.lesson-ai__quick { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1rem; }
.lesson-ai__quick button,
.lesson-ai .mode-chips button {
  min-height: 2rem;
  border: 1px solid #d7dfe6;
  border-radius: 999px;
  background: #fff;
  color: #4b5865;
  padding: .42rem .7rem;
  font-size: .7rem;
  font-weight: 750;
  transition: border-color 140ms ease, color 140ms ease, background-color 140ms ease, transform 140ms ease;
}
.lesson-ai__quick button:hover,
.lesson-ai .mode-chips button:hover { border-color: #aabccc; color: var(--lesson-accent-dark); transform: translateY(-1px); }
.lesson-ai .mode-chips { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1rem; }
.lesson-ai .mode-chips button.active { border-color: #9eb1c2; background: #e7eff5; color: var(--lesson-accent-dark); }
.lesson-ai__form { margin-top: .75rem; }
.lesson-ai__form textarea {
  width: 100%;
  resize: vertical;
  min-height: 7rem;
  max-height: 18rem;
  border: 1px solid #cfd7de;
  border-radius: .7rem;
  background: #fff;
  color: var(--lesson-ink);
  padding: .85rem .9rem;
  outline: none;
  line-height: 1.55;
}
.lesson-ai__form textarea:focus { border-color: #7692ab; box-shadow: 0 0 0 3px rgba(49,95,141,.1); }
.lesson-ai__submit-row { display: flex; align-items: center; justify-content: flex-end; gap: .75rem; margin-top: .65rem; }
.lesson-ai__submit-row > span { display: none; margin-right: auto; color: var(--lesson-subtle); font-size: .66rem; }
.lesson-ai .ai-response {
  display: none;
  margin-top: 1rem;
  padding: 1rem;
  border-top: 1px solid #dce4ea;
  color: #34404d;
  font-size: .86rem;
  line-height: 1.65;
}
.lesson-ai .ai-response p { margin: 0 0 .7rem; }
.lesson-ai .ai-response p:last-child { margin-bottom: 0; }

.lesson-finish {
  display: grid;
  gap: 1rem;
  align-items: center;
}
.lesson-finish p { margin: .4rem 0 0; color: var(--lesson-muted); font-size: .86rem; }
.lesson-finish .button { justify-self: start; }

.lesson-pagination {
  display: grid;
  gap: .65rem;
  padding-top: clamp(1.5rem, 5vw, 3rem);
}
.lesson-pagination__item {
  min-width: 0;
  padding: .9rem 1rem;
  border: 1px solid var(--lesson-line);
  border-radius: var(--lesson-radius-md);
  background: #fff;
  transition: border-color 140ms ease, transform 140ms ease, background-color 140ms ease;
}
.lesson-pagination__item:hover { border-color: #b8c4cf; background: #fbfcfc; transform: translateY(-1px); }
.lesson-pagination__item > span { display: block; color: var(--lesson-muted); font-size: .68rem; }
.lesson-pagination__item > b { display: block; margin-top: .2rem; overflow: hidden; color: var(--lesson-ink); font-size: .82rem; line-height: 1.35; text-overflow: ellipsis; white-space: nowrap; }
.lesson-pagination__item--next { text-align: right; }

.lesson-page-v9 a:focus-visible,
.lesson-page-v9 button:focus-visible,
.lesson-page-v9 summary:focus-visible,
.lesson-page-v9 textarea:focus-visible {
  outline: 3px solid rgba(49, 95, 141, .28);
  outline-offset: 3px;
}

@media (min-width: 42rem) {
  .lesson-course-title-row { grid-template-columns: minmax(0, 1fr) 17rem; align-items: end; }
  .lesson-mastery { padding-top: 0; border-top: 0; }
  .lesson-section-heading--split { grid-template-columns: minmax(0, 1fr) minmax(16rem, 24rem); align-items: end; }
  .lesson-formula-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-core__grid { grid-template-columns: minmax(0, 1.35fr) minmax(13rem, .65fr); gap: 1.4rem; }
  .lesson-finish { grid-template-columns: minmax(0, 1fr) auto; }
  .lesson-finish .button { justify-self: end; }
  .lesson-pagination { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-ai__submit-row > span { display: block; }
}

@media (min-width: 68rem) {
  .lesson-outline-mobile { display: none; }
  .lesson-shell-v9 {
    display: grid;
    grid-template-columns: minmax(12rem, 14.5rem) minmax(0, 48rem);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }
  .lesson-syllabus { display: block; min-width: 0; }
  .lesson-syllabus__sticky { position: sticky; top: 1.25rem; padding-top: 2.7rem; }
  .lesson-syllabus__head { display: flex; justify-content: space-between; gap: .75rem; color: var(--lesson-muted); font-size: .7rem; }
  .lesson-syllabus__head b { color: var(--lesson-ink); font-variant-numeric: tabular-nums; }
  .lesson-syllabus__progress { height: 3px; margin: .65rem 0 1rem; overflow: hidden; border-radius: 999px; background: #e1e4e6; }
  .lesson-syllabus__progress span { display: block; height: 100%; background: var(--lesson-accent); border-radius: inherit; }
  .lesson-syllabus ol { margin: 0; padding: 0; list-style: none; }
  .lesson-syllabus li + li { margin-top: .1rem; }
  .lesson-syllabus a { min-width: 0; }
  .lesson-syllabus nav a {
    display: grid;
    grid-template-columns: 1.65rem minmax(0, 1fr);
    gap: .5rem;
    align-items: start;
    padding: .58rem .55rem;
    border-left: 2px solid transparent;
    color: var(--lesson-muted);
    font-size: .74rem;
    line-height: 1.35;
  }
  .lesson-syllabus nav a:hover { color: var(--lesson-ink); background: #f1f2f1; }
  .lesson-syllabus nav a[aria-current="page"] { border-left-color: var(--lesson-accent); background: #eef2f5; color: var(--lesson-accent-dark); font-weight: 750; }
  .lesson-syllabus__number { color: var(--lesson-subtle); font-size: .65rem; font-variant-numeric: tabular-nums; }
  .lesson-syllabus__text { min-width: 0; overflow-wrap: anywhere; }
  .lesson-practice-link {
    display: flex;
    justify-content: space-between;
    gap: .6rem;
    margin-top: 1rem;
    padding: .75rem .55rem;
    border-top: 1px solid var(--lesson-line);
    color: var(--lesson-accent-dark);
    font-size: .73rem;
    font-weight: 800;
  }
}

@media (min-width: 86rem) {
  .lesson-shell-v9 {
    grid-template-columns: minmax(12rem, 14.5rem) minmax(0, 48rem) minmax(11rem, 13rem);
    gap: clamp(2rem, 3vw, 3.25rem);
  }
  .lesson-tools { display: block; min-width: 0; }
  .lesson-tools__sticky { position: sticky; top: 1.25rem; display: grid; gap: 1rem; padding-top: 2.7rem; }
  .lesson-on-page { display: grid; gap: .2rem; }
  .lesson-on-page > span { margin-bottom: .45rem; color: var(--lesson-subtle); font-size: .65rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
  .lesson-on-page a { padding: .38rem 0; border-left: 1px solid var(--lesson-line-strong); color: var(--lesson-muted); font-size: .7rem; padding-left: .65rem; }
  .lesson-on-page a:hover,
  .lesson-on-page a.is-active { border-left-color: var(--lesson-accent); color: var(--lesson-accent-dark); }
  .lesson-tools__practice { padding-top: 1rem; border-top: 1px solid var(--lesson-line); }
  .lesson-tools__practice > span { display: block; color: var(--lesson-ink); font-size: .76rem; font-weight: 800; }
  .lesson-tools__practice p { margin: .35rem 0 .75rem; color: var(--lesson-muted); font-size: .7rem; line-height: 1.5; }
  .lesson-tools__practice a { color: var(--lesson-accent-dark); font-size: .72rem; font-weight: 800; }
}

@media (prefers-reduced-motion: reduce) {
  .lesson-reading-progress > span,
  .lesson-outline-mobile summary::after,
  .lesson-pagination__item,
  .lesson-ai button { transition: none; }
}

.lesson-visual__figure figcaption small {
  color: var(--muted-strong, #607089);
  font-size: .8rem;
}

.lesson-examples {
  display: grid;
  gap: clamp(1rem, 1.2vw, 1.4rem);
}

.lesson-examples__grid {
  display: grid;
  gap: clamp(1rem, 1.2vw, 1.3rem);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
}

.lesson-example-card {
  background: #fff;
  border: 1px solid var(--stroke, #d8e1ec);
  border-radius: 1.2rem;
  padding: clamp(1rem, 2vw, 1.25rem);
  display: grid;
  gap: .85rem;
}

.lesson-example-card__header {
  display: grid;
  gap: .35rem;
}

.lesson-example-card__header span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-width: 4.75rem;
  padding: .34rem .6rem;
  border-radius: 999px;
  background: #edf4fb;
  color: var(--accent-700, #184d87);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.lesson-example-card__header h4 {
  margin: 0;
  font-size: clamp(1rem, 1.8vw, 1.12rem);
  line-height: 1.35;
}

.lesson-example-card__problem,
.lesson-example-card__answer {
  margin: 0;
  color: var(--ink-soft, #42556d);
  line-height: 1.65;
}

.lesson-example-card__steps {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--ink, #10253d);
  line-height: 1.65;
}

.lesson-example-card__steps li + li {
  margin-top: .42rem;
}

.lesson-example-card__answer {
  padding-top: .85rem;
  border-top: 1px solid var(--stroke-soft, #e6edf5);
}