.learn-hero,
.learn-app-shell,
.learn-glossary {
  max-width: 1280px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.learn-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(320px, 0.9fr);
  gap: 1.5rem;
  align-items: stretch;
}

.learn-hero__copy,
.learn-hero__stats,
.learn-player,
.learn-roadmap-card,
.learn-stat-card,
.learn-glossary-card,
.learn-slide-card {
  border: 2px solid var(--color-border, #111);
  background: var(--color-surface, #fff);
  box-shadow: 6px 6px 0 var(--color-border, #111);
}

html.dark .learn-hero__copy,
html.dark .learn-hero__stats,
html.dark .learn-player,
html.dark .learn-roadmap-card,
html.dark .learn-stat-card,
html.dark .learn-glossary-card,
html.dark .learn-slide-card {
  background: var(--color-surface-dark, #1a1a1a);
  box-shadow: 6px 6px 0 var(--color-ink-dark, #f4f4f0);
}

.learn-hero__copy {
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.learn-hero__copy::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17,17,17,0.06) 1px, transparent 1px),
    linear-gradient(rgba(17,17,17,0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

html.dark .learn-hero__copy::before {
  background:
    linear-gradient(90deg, rgba(244,244,240,0.06) 1px, transparent 1px),
    linear-gradient(rgba(244,244,240,0.06) 1px, transparent 1px);
  background-size: 32px 32px;
}

.learn-hero__eyebrow,
.learn-slide-card__kicker,
.learn-roadmap-card__meta,
.learn-stat-card__label,
.learn-player__meta,
.learn-section-head .section-num,
.learn-roadmap-card__status,
.learn-roadmap-card__num,
.learn-teaser-card__num,
.learn-teaser-card__meta,
.learn-visual__eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.learn-hero__title {
  position: relative;
  z-index: 1;
  margin: 0.75rem 0 1rem;
  font-family: "Clash Display", "Space Grotesk", sans-serif;
  font-size: clamp(2.6rem, 5vw, 5rem);
  line-height: 0.94;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.learn-hero__body,
.learn-section-head__body,
.learn-player__intro,
.learn-roadmap-card__summary,
.learn-slide-card__body,
.learn-stat-card__body,
.learn-glossary-card__definition,
.learn-feedback__copy,
.learn-visual__copy {
  color: var(--color-text-muted, #666);
  line-height: 1.7;
}

.learn-hero__eyebrow,
.learn-slide-card__kicker,
.learn-stat-card__label,
.learn-player__meta,
.learn-roadmap-card__status,
.learn-roadmap-card__num,
.learn-teaser-card__num,
.learn-teaser-card__meta,
.learn-visual__eyebrow {
  color: var(--color-text-muted, #666);
}

.learn-hero__actions,
.learn-player__nav,
.learn-quiz__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.learn-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.1rem;
  border: 2px solid var(--color-border, #111);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  cursor: pointer;
}

.learn-button:hover {
  transform: translate(4px, 4px);
  box-shadow: none;
}

.learn-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.learn-button--primary {
  background: var(--color-primary, #9D00FF);
  color: #fff;
  box-shadow: 6px 6px 0 var(--color-border, #111);
}

.learn-button--ghost {
  background: var(--color-surface, #fff);
  color: var(--color-text, #111);
  box-shadow: 6px 6px 0 var(--color-border, #111);
}

html.dark .learn-button--ghost {
  background: var(--color-surface-dark, #1a1a1a);
  color: var(--color-ink-dark, #f4f4f0);
  box-shadow: 6px 6px 0 var(--color-ink-dark, #f4f4f0);
}

html.dark .learn-button--primary {
  box-shadow: 6px 6px 0 var(--color-ink-dark, #f4f4f0);
}

.learn-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 1rem;
}

.learn-stat-card {
  padding: 1.2rem;
}

.learn-stat-card--accent {
  background: var(--color-accent, #00E676);
  color: #111;
}

html.dark .learn-stat-card--accent {
  background: var(--color-accent, #00E676);
  color: #111;
}

.learn-stat-card--accent .learn-stat-card__label,
.learn-stat-card--accent .learn-stat-card__body {
  color: rgba(17, 17, 17, 0.82);
}

.learn-stat-card__value {
  display: block;
  margin-top: 0.35rem;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.learn-section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.learn-section-head__title {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.learn-app-shell__grid {
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  gap: 1.5rem;
}

.learn-roadmap {
  position: sticky;
  top: 96px;
  align-self: start;
}

.learn-roadmap__mobile-bar {
  display: none;
}

.learn-roadmap__mobile-label,
.learn-roadmap__mobile-summary {
  margin: 0;
}

.learn-roadmap__mobile-label {
  display: block;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted, #666);
}

.learn-roadmap__mobile-summary {
  margin-top: 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.25;
}

.learn-roadmap__toggle {
  min-width: 10.5rem;
}

.learn-roadmap-card {
  padding: 1rem;
  margin-bottom: 1rem;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.learn-roadmap-card.is-active,
.learn-roadmap-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary, #9D00FF);
}

.learn-roadmap-card__top,
.learn-roadmap-card__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.learn-roadmap-card__title {
  margin: 0.7rem 0 0.5rem;
  font-size: 1.4rem;
  line-height: 1.1;
}

.learn-roadmap-card__bar,
.learn-player__progress-bar {
  width: 100%;
  height: 10px;
  border: 2px solid var(--color-border, #111);
  background: rgba(157, 0, 255, 0.08);
  overflow: hidden;
}

.learn-roadmap-card__fill,
.learn-player__progress-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary, #9D00FF), var(--color-accent, #00E676));
}

.learn-roadmap-card__bar {
  margin: 1rem 0 0.85rem;
}

.learn-player {
  padding: 1.5rem;
}

.learn-player__top {
  margin-bottom: 1.2rem;
}

.learn-player__progress {
  margin-top: 1.2rem;
}

.learn-player__progress p {
  margin: 0.65rem 0 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted, #666);
}

.learn-slide-card {
  padding: 1.5rem;
}

.learn-slide-card__title {
  margin: 0.5rem 0 1rem;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.learn-slide-card--quiz {
  background: linear-gradient(180deg, rgba(157, 0, 255, 0.07), transparent 28%), var(--color-surface, #fff);
}

html.dark .learn-slide-card--quiz {
  background: linear-gradient(180deg, rgba(157, 0, 255, 0.16), transparent 28%), var(--color-surface-dark, #1a1a1a);
}

.learn-visual {
  margin-top: 1.5rem;
  padding: 1rem;
  border: 2px dashed var(--color-border, #111);
  background: rgba(0, 0, 0, 0.02);
}

html.dark .learn-visual {
  background: rgba(255, 255, 255, 0.03);
}

.learn-visual__title,
.learn-glossary-card__term,
.learn-visual__column-title {
  margin: 0 0 0.8rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.learn-visual__stack,
.learn-visual__columns,
.learn-visual__compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.8rem;
}

.learn-visual__stack-card,
.learn-visual__compare-card,
.learn-visual__column {
  border: 2px solid var(--color-border, #111);
  padding: 0.9rem;
  background: var(--color-surface, #fff);
}

html.dark .learn-visual__stack-card,
html.dark .learn-visual__compare-card,
html.dark .learn-visual__column {
  background: rgba(255, 255, 255, 0.03);
}

.learn-visual__compare-card.is-strong,
.learn-visual__pill.is-strong,
.learn-visual__token.is-strong {
  background: var(--color-accent, #00E676);
  color: #111;
}

.learn-visual__compare-card.is-strong .learn-visual__copy,
.learn-visual__compare-card.is-strong .learn-visual__eyebrow {
  color: rgba(17, 17, 17, 0.84);
}

.learn-visual__map {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
}

.learn-visual__map-rail,
.learn-visual__chain {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.learn-visual__pill,
.learn-visual__token,
.learn-visual__chain-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.75rem;
  border: 2px solid var(--color-border, #111);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--color-surface, #fff);
}

.learn-visual__chain-arrow {
  font-size: 1.4rem;
  font-weight: 700;
}

.learn-quiz__prompt,
.learn-quiz__hint {
  margin: 0 0 1rem;
  color: var(--color-text-muted, #666);
}

.learn-quiz__option {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.9rem 1rem;
  margin-bottom: 0.75rem;
  border: 2px solid var(--color-border, #111);
  background: rgba(0, 0, 0, 0.02);
}

html.dark .learn-quiz__option {
  background: rgba(255, 255, 255, 0.03);
}

.learn-quiz__textarea,
.learn-match-row__select {
  width: 100%;
  border: 2px solid var(--color-border, #111);
  padding: 0.85rem;
  background: var(--color-surface, #fff);
  color: inherit;
  font: inherit;
}

html.dark .learn-quiz__textarea,
html.dark .learn-match-row__select {
  background: var(--color-surface-dark, #1a1a1a);
}

.learn-match-row,
.learn-rank-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 240px);
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.8rem;
}

.learn-match-row__term,
.learn-rank-row__label {
  padding: 0.85rem 1rem;
  border: 2px solid var(--color-border, #111);
  background: rgba(157, 0, 255, 0.06);
  font-weight: 700;
}

.learn-rank-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.learn-rank-row {
  grid-template-columns: minmax(0, 1fr) auto;
}

.learn-rank-row__controls {
  display: flex;
  gap: 0.45rem;
}

.learn-rank-row__btn {
  width: 2.4rem;
  height: 2.4rem;
  border: 2px solid var(--color-border, #111);
  background: var(--color-surface, #fff);
  cursor: pointer;
}

html.dark .learn-rank-row__btn {
  background: var(--color-surface-dark, #1a1a1a);
  color: inherit;
}

.learn-quiz__source,
.learn-feedback {
  margin-top: 1rem;
  padding: 1rem;
  border: 2px solid var(--color-border, #111);
}

.learn-feedback.is-correct {
  background: rgba(0, 230, 118, 0.12);
}

.learn-feedback.is-incorrect {
  background: rgba(157, 0, 255, 0.1);
}

.learn-feedback.is-correct .learn-feedback__title,
.learn-feedback.is-correct .learn-feedback__copy {
  color: var(--color-text, #111);
}

.learn-feedback.is-incorrect .learn-feedback__title,
.learn-feedback.is-incorrect .learn-feedback__copy {
  color: var(--color-text, #111);
}

.learn-feedback__title {
  display: block;
  margin-bottom: 0.45rem;
}

.learn-glossary__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.learn-glossary-card {
  padding: 1rem;
}

.learn-teaser {
  background: linear-gradient(180deg, transparent 0%, rgba(157, 0, 255, 0.05) 100%);
}

.learn-teaser__intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.7fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.learn-teaser__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.learn-teaser-card {
  border: 2px solid var(--color-border, #111);
  padding: 1rem;
  background: var(--color-surface, #fff);
  box-shadow: 6px 6px 0 var(--color-border, #111);
}

html.dark .learn-teaser-card {
  background: var(--color-surface-dark, #1a1a1a);
  box-shadow: 6px 6px 0 var(--color-ink-dark, #f4f4f0);
}

.learn-teaser-card__title {
  margin: 0.7rem 0 0.5rem;
  font-size: 1.15rem;
  line-height: 1.1;
}

.learn-teaser-card__summary {
  margin: 0;
  color: var(--color-text-muted, #666);
  line-height: 1.65;
}

.learn-teaser__aside {
  border: 2px solid var(--color-border, #111);
  padding: 1.2rem;
  background: var(--color-accent, #00E676);
  color: #111;
  box-shadow: 6px 6px 0 var(--color-border, #111);
}

.learn-teaser__aside p {
  color: rgba(17, 17, 17, 0.84);
}

.learn-noscript {
  margin-top: 1.5rem;
  border: 2px solid var(--color-border, #111);
  padding: 1rem;
}

@media (max-width: 1100px) {
  .learn-hero__inner,
  .learn-app-shell__grid,
  .learn-teaser__intro {
    grid-template-columns: 1fr;
  }

  .learn-roadmap {
    position: static;
  }

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

@media (max-width: 860px) {
  .learn-app-shell__grid {
    gap: 1rem;
  }

  .learn-player {
    order: 1;
    padding: 1.25rem;
  }

  .learn-roadmap {
    order: 2;
    position: static;
    top: auto;
  }

  .learn-roadmap__mobile-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.9rem;
    padding: 1rem 1.1rem;
    border: 2px solid var(--color-border, #111);
    background: var(--color-surface, #fff);
    box-shadow: 6px 6px 0 var(--color-border, #111);
  }

  html.dark .learn-roadmap__mobile-bar {
    background: var(--color-surface-dark, #1a1a1a);
    box-shadow: 6px 6px 0 var(--color-ink-dark, #f4f4f0);
  }

  .learn-roadmap__panel[hidden] {
    display: none;
  }

  .learn-roadmap__panel {
    margin-top: 0.9rem;
  }

  .learn-roadmap-card {
    padding: 0.9rem;
    margin-bottom: 0.8rem;
  }

  .learn-roadmap-card__title {
    font-size: 1.15rem;
    margin: 0.6rem 0 0.45rem;
  }

  .learn-roadmap-card__meta,
  .learn-roadmap-card__summary,
  .learn-roadmap-card__percent {
    font-size: 0.88rem;
  }

  .learn-roadmap-card .learn-button {
    width: auto;
    min-height: 2.75rem;
    padding-inline: 0.95rem;
  }
}

@media (max-width: 720px) {
  .learn-hero,
  .learn-app-shell,
  .learn-glossary {
    padding: 2.75rem 1rem;
  }

  .learn-hero__inner {
    gap: 1rem;
  }

  .learn-hero__copy {
    padding: 1.35rem;
  }

  .learn-hero__title {
    margin: 0.6rem 0 0.85rem;
    font-size: clamp(2rem, 11vw, 3rem);
    line-height: 0.92;
  }

  .learn-hero__body {
    font-size: 0.98rem;
    line-height: 1.6;
  }

  .learn-hero__actions {
    gap: 0.6rem;
    margin-top: 1.2rem;
  }

  .learn-hero__actions .learn-button {
    width: auto;
    flex: 1 1 11rem;
  }

  .learn-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
    padding: 0.75rem;
  }

  .learn-stat-card {
    padding: 1rem;
  }

  .learn-stat-card__value {
    font-size: clamp(1.65rem, 8vw, 2.4rem);
  }

  .learn-section-head {
    gap: 0.65rem;
    margin-bottom: 1rem;
  }

  .learn-section-head__title {
    font-size: clamp(1.85rem, 10vw, 2.8rem);
  }

  .learn-section-head__body,
  .learn-player__intro,
  .learn-slide-card__body,
  .learn-stat-card__body,
  .learn-glossary-card__definition {
    font-size: 0.96rem;
    line-height: 1.6;
  }

  .learn-player {
    padding: 1rem;
  }

  .learn-player__top {
    margin-bottom: 1rem;
  }

  .learn-slide-card {
    padding: 1rem;
  }

  .learn-slide-card__title {
    font-size: clamp(1.45rem, 8.5vw, 2rem);
    line-height: 1;
    margin: 0.4rem 0 0.85rem;
  }

  .learn-player__nav {
    gap: 0.65rem;
  }

  .learn-player__nav .learn-button {
    flex: 1 1 10rem;
    width: auto;
  }

  .learn-quiz__option,
  .learn-feedback,
  .learn-quiz__source,
  .learn-visual {
    padding: 0.85rem;
  }

  .learn-glossary-card {
    padding: 0.9rem;
  }

  .learn-teaser__grid,
  .learn-glossary__grid,
  .learn-visual__stack,
  .learn-visual__columns,
  .learn-visual__compare {
    grid-template-columns: 1fr;
  }

  .learn-match-row,
  .learn-rank-row,
  .learn-visual__map {
    grid-template-columns: 1fr;
  }

  .learn-section-head {
    flex-direction: column;
  }

  #newsletter .flex.items-baseline {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    gap: 0.75rem;
  }

  #newsletter h2 {
    font-size: clamp(2.7rem, 18vw, 4.25rem);
    line-height: 0.92;
  }

  #newsletter p {
    margin-bottom: 2rem;
  }
}

@media (max-width: 560px) {
  .learn-hero,
  .learn-app-shell,
  .learn-glossary {
    padding: 2.2rem 0.9rem;
  }

  .learn-hero__copy {
    padding: 1.15rem;
  }

  .learn-hero__actions .learn-button,
  .learn-player__nav .learn-button,
  .learn-button {
    width: 100%;
  }

  .learn-hero__stats {
    grid-template-columns: 1fr;
  }

  .learn-roadmap__mobile-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 0.95rem 1rem;
  }

  .learn-roadmap__toggle {
    min-width: 0;
  }

  .learn-player__meta,
  .learn-roadmap-card__meta {
    font-size: 0.7rem;
  }

  .learn-match-row__term,
  .learn-rank-row__label,
  .learn-quiz__textarea,
  .learn-match-row__select {
    padding: 0.75rem 0.8rem;
  }

  .learn-rank-row__controls {
    justify-content: flex-start;
  }
}

/* === Course Tabs === */
.learn-course-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid #111;
  margin-bottom: 2rem;
}

.learn-course-tab {
  padding: 0.6rem 1.25rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  border: 2px solid #111;
  border-bottom: none;
  cursor: pointer;
  background: transparent;
  margin-right: -2px;
  min-height: 44px;
}

.learn-course-tab.is-active {
  background: var(--color-accent, #00E676);
  color: #fff;
  border-color: var(--color-accent, #00E676);
}

.learn-course-tab:focus-visible {
  outline: 2px solid var(--color-accent, #00E676);
  outline-offset: 2px;
}

/* === Hints === */
.learn-hint {
  border: 2px solid var(--color-accent);
  padding: 1rem 1.25rem;
  margin-top: 0.75rem;
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
}
.learn-hint__label {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.7;
  display: block;
  margin-bottom: 0.35rem;
}
.learn-hint__text {
  margin: 0 0 0.75rem;
}
.learn-hint__retry {
  margin-top: 0.5rem;
}