/* Learn platform — lab/docs aesthetic on arcade tokens */

/* ---------- Reading progress ---------- */
.learn-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 60;
  background: transparent;
  pointer-events: none;
}

.learn-progress__bar {
  height: 100%;
  width: 0%;
  background: var(--c-cyan);
  transition: width 0.08s linear;
}

/* ---------- Hub ---------- */
.learn-hub-tagline {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.85rem;
  color: var(--text-3);
  margin-top: 0.75rem;
}

.learn-module-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 2px solid var(--border-1);
  background: var(--bg-1);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.learn-module-card:hover,
.learn-module-card:focus-within {
  border-color: color-mix(in srgb, var(--c-cyan) 55%, var(--border-1));
  box-shadow: var(--pixel-shadow, 4px 4px 0 0 color-mix(in srgb, var(--c-cyan) 25%, transparent));
}

.learn-module-card__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 2px solid var(--border-1);
  background: var(--bg-2);
}

.learn-module-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.learn-module-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.25rem 1.35rem 1.5rem;
  gap: 0.75rem;
}

.learn-module-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.learn-module-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---------- Module curriculum ---------- */
.learn-curriculum {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.learn-curriculum__item {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  gap: 0.75rem 1rem;
  align-items: start;
  padding: 1rem 1.1rem;
  border: 2px solid var(--border-1);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}

.learn-curriculum__item:hover,
.learn-curriculum__item:focus-visible {
  border-color: color-mix(in srgb, var(--c-cyan) 50%, transparent);
  outline: none;
}

.learn-curriculum__num {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.85rem;
  color: var(--text-3);
  padding-top: 0.15rem;
}

.learn-curriculum__title {
  display: block;
  font-weight: 600;
  color: var(--text-1);
}

.learn-curriculum__item:hover .learn-curriculum__title {
  color: var(--c-cyan);
}

.learn-curriculum__desc {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.9rem;
  color: var(--text-2);
}

.learn-curriculum__time {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--text-3);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .learn-curriculum__item {
    grid-template-columns: 2rem 1fr;
  }
  .learn-curriculum__time {
    grid-column: 2;
  }
}

/* ---------- Lesson layout ---------- */
.learn-layout {
  display: grid;
  gap: 2rem;
}

@media (min-width: 1100px) {
  .learn-layout {
    grid-template-columns: 15rem minmax(0, 1fr) 13rem;
    gap: 2rem;
    align-items: start;
  }

  .learn-sidebar,
  .learn-toc {
    position: sticky;
    top: 5.5rem;
    max-height: calc(100vh - 6.5rem);
    overflow: auto;
  }
}

.learn-nav-panel,
.learn-toc-panel {
  padding: 1rem;
  border: 2px solid var(--border-1);
  background: var(--bg-1);
}

.learn-nav-list,
.learn-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.learn-nav-item,
.learn-toc-link {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.45rem 0.5rem;
  color: var(--text-2);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  font-size: 0.85rem;
  line-height: 1.35;
  text-align: left;
  background: transparent;
  width: 100%;
  cursor: pointer;
}

.learn-nav-item:hover,
.learn-nav-item:focus-visible,
.learn-toc-link:hover,
.learn-toc-link:focus-visible {
  color: var(--text-1);
  border-color: color-mix(in srgb, var(--c-cyan) 40%, transparent);
  outline: none;
}

.learn-nav-item--current,
.learn-toc-link--active {
  color: var(--c-cyan);
  background: color-mix(in srgb, var(--c-cyan) 8%, transparent);
  border-color: color-mix(in srgb, var(--c-cyan) 35%, transparent);
}

.learn-nav-marker {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
  line-height: 1.4;
  width: 1rem;
  flex-shrink: 0;
  color: var(--text-3);
}

.learn-nav-item--current .learn-nav-marker {
  color: var(--c-cyan);
}

.learn-lesson-kicker {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--text-3);
  margin-bottom: 0.5rem;
}

.learn-mobile-nav {
  margin-bottom: 1rem;
}

.learn-mobile-nav summary {
  cursor: pointer;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-1);
  background: var(--bg-1);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--text-2);
}

.learn-mobile-nav[open] summary {
  border-bottom: none;
}

.learn-mobile-nav .learn-nav-panel,
.learn-mobile-nav .learn-toc-panel {
  border-top: none;
}

@media (min-width: 1100px) {
  .learn-mobile-nav {
    display: none;
  }
}

@media (max-width: 1099px) {
  .learn-sidebar--desktop,
  .learn-toc--desktop {
    display: none;
  }
}

/* ---------- Shared cards / callouts ---------- */
.learn-card,
.learn-callout,
.learn-hints,
.learn-checklist,
.learn-explorer,
.learn-perms,
.learn-portmap,
.learn-arch,
.learn-video-slot {
  margin: 1.5rem 0;
  padding: 1.1rem 1.2rem;
  border: 2px solid var(--border-1);
  background: var(--bg-1);
}

.learn-card__eyebrow,
.learn-callout__title,
.learn-hints__title {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  margin: 0 0 0.65rem;
}

.learn-hints__lead {
  margin: 0 0 1rem;
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.45;
  max-width: 42rem;
}

.learn-hint__step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  margin-right: 0.35rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  color: var(--c-cyan);
}

.learn-card__meta {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--text-3);
  margin: -0.35rem 0 0.75rem;
}

.learn-card--objective {
  border-color: color-mix(in srgb, var(--c-cyan) 45%, var(--border-1));
}

.learn-card--lab {
  border-color: color-mix(in srgb, var(--c-purple) 40%, var(--border-1));
}

.learn-card--lab .learn-card__eyebrow {
  color: var(--c-purple-bright, var(--c-purple));
}

.learn-card--challenge {
  border-color: color-mix(in srgb, var(--c-pink) 40%, var(--border-1));
}

.learn-card--challenge .learn-card__eyebrow {
  color: var(--c-pink);
}

.learn-card--trouble {
  border-color: color-mix(in srgb, #f59e0b 45%, var(--border-1));
}

.learn-card--trouble .learn-card__eyebrow {
  color: #f59e0b;
}

.learn-card--try {
  border-color: color-mix(in srgb, var(--c-cyan) 50%, var(--border-1));
  background: color-mix(in srgb, var(--c-cyan) 6%, var(--bg-1));
}

.learn-card--try .learn-card__eyebrow {
  color: var(--c-cyan);
}

.learn-callout--tip {
  border-color: color-mix(in srgb, var(--c-cyan) 35%, var(--border-1));
}

.learn-callout--warning {
  border-color: color-mix(in srgb, #f59e0b 45%, var(--border-1));
}

.learn-callout--danger {
  border-color: color-mix(in srgb, #ef4444 45%, var(--border-1));
}

.learn-section {
  margin: 2rem 0;
}

.learn-section > h2 {
  margin-top: 0;
}

/* ---------- Hints ---------- */
.learn-hint {
  border: 1px solid var(--border-1);
  margin-bottom: 0.4rem;
  background: var(--bg-2);
}

.learn-hint summary {
  cursor: pointer;
  padding: 0.65rem 0.85rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--text-2);
  list-style: none;
}

.learn-hint summary::-webkit-details-marker {
  display: none;
}

.learn-hint summary::before {
  content: '▸ ';
  color: var(--c-cyan);
}

.learn-hint[open] summary::before {
  content: '▾ ';
}

.learn-hint__body {
  padding: 0 0.85rem 0.85rem;
  color: var(--text-2);
  font-size: 0.95rem;
}

/* ---------- Checklist ---------- */
.learn-checklist__items {
  list-style: none;
  margin: 0.75rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.learn-checklist__items li {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
}

.learn-check {
  width: 1rem;
  height: 1rem;
  margin-top: 0.2rem;
  border: 2px solid var(--text-3);
  flex-shrink: 0;
}

.learn-checklist__note {
  margin: 0.75rem 0 0;
  color: var(--text-3);
}

/* ---------- Exit quiz (DoD) ---------- */
.learn-exit-quiz {
  margin: 2rem 0;
  padding: 1.25rem 1.35rem;
  border: 2px solid color-mix(in srgb, var(--c-cyan) 40%, var(--border-1));
  background: var(--bg-1);
}

.learn-exit-quiz h2 {
  margin: 0 0 0.5rem;
}

.learn-exit-quiz__lead {
  margin: 0 0 1rem;
  color: var(--text-2);
  font-size: 0.95rem;
}

.learn-exit-quiz__meta {
  margin: 0 0 0.5rem;
  color: var(--text-3);
}

.learn-exit-quiz__q {
  margin: 0 0 0.85rem;
  font-weight: 600;
  color: var(--text-1);
}

.learn-exit-quiz__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.learn-exit-quiz__summary {
  padding: 0.85rem 0;
}

.learn-exit-quiz__summary.is-passed .learn-exit-quiz__score {
  color: color-mix(in srgb, var(--c-cyan) 80%, var(--text-1));
}

.learn-exit-quiz__score {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
}

.learn-exit-quiz__skipped {
  margin: 0 0 0.75rem;
}

.learn-nav-item__status,
.learn-curriculum__status {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

.learn-nav-item__status.is-passed,
.learn-curriculum__status.is-passed {
  color: var(--c-cyan);
}

.learn-nav-item__status.is-attempted,
.learn-curriculum__status.is-attempted {
  color: var(--c-pink);
}

.learn-module-progress {
  margin: 0.75rem 0 0;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--text-2);
}

/* ---------- Terminal ---------- */
.learn-terminal,
.learn-code {
  margin: 1.25rem 0;
  border: 2px solid var(--border-strong, var(--border-1));
  background: #0b1220;
  color: #e5e7eb;
  overflow: hidden;
}

html:not(.dark) .learn-terminal,
html:not(.dark) .learn-code {
  background: #111827;
}

.learn-terminal__chrome,
.learn-code__chrome {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid color-mix(in srgb, #fff 12%, transparent);
  background: color-mix(in srgb, #000 35%, transparent);
}

.learn-terminal__label,
.learn-code__file {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  color: #93c5fd;
  margin-right: auto;
}

.learn-code__lang {
  margin-right: auto;
  color: #9ca3af;
}

.learn-code__file + .learn-code__lang {
  margin-right: 0;
}

.learn-copy {
  margin-left: auto;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.5rem;
  border: 1px solid color-mix(in srgb, #fff 20%, transparent);
  background: transparent;
  color: #d1d5db;
  cursor: pointer;
}

.learn-copy:hover,
.learn-copy:focus-visible {
  color: #fff;
  border-color: var(--c-cyan);
  outline: none;
}

.learn-copy.is-copied {
  color: #86efac;
  border-color: #86efac;
}

.learn-terminal__cmd,
.learn-terminal__output,
.learn-code__pre {
  margin: 0;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.82rem;
  line-height: 1.55;
  white-space: pre;
}

.learn-terminal__prompt {
  color: #67e8f9;
  user-select: none;
}

.learn-terminal__command {
  color: #f9fafb;
}

.learn-terminal__output-wrap {
  border-top: 1px solid color-mix(in srgb, #fff 10%, transparent);
}

.learn-terminal__output-label {
  display: block;
  padding: 0.4rem 1rem 0;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  color: #9ca3af;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.learn-terminal__output {
  color: #9ca3af;
}

.learn-terminal__explain,
.learn-terminal__hint {
  margin: 0;
  padding: 0.65rem 1rem 0.85rem;
  font-size: 0.9rem;
  color: #d1d5db;
  background: color-mix(in srgb, #000 25%, transparent);
}

.learn-token {
  display: inline;
  padding: 0 0.15rem;
  border: none;
  border-bottom: 1px dashed #67e8f9;
  background: color-mix(in srgb, #22d3ee 18%, transparent);
  color: #e0f2fe;
  font: inherit;
  cursor: pointer;
}

.learn-token:hover,
.learn-token:focus-visible,
.learn-token[aria-expanded='true'] {
  background: color-mix(in srgb, #22d3ee 35%, transparent);
  outline: none;
}

.learn-term {
  position: relative;
  display: inline;
  padding: 0 0.1rem;
  margin: 0;
  border: none;
  border-bottom: 1px dashed color-mix(in srgb, var(--c-cyan) 70%, transparent);
  background: color-mix(in srgb, var(--c-cyan) 14%, transparent);
  color: inherit;
  font: inherit;
  font-weight: 600;
  line-height: inherit;
  cursor: help;
  vertical-align: baseline;
}

.learn-term:hover,
.learn-term:focus-visible,
.learn-term.is-open {
  background: color-mix(in srgb, var(--c-cyan) 28%, transparent);
  outline: none;
}

.learn-term__label {
  pointer-events: none;
}

.learn-term__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.45rem);
  z-index: 40;
  width: max-content;
  max-width: min(22rem, 80vw);
  padding: 0.65rem 0.85rem;
  border: 2px solid color-mix(in srgb, var(--c-cyan) 45%, var(--border-1));
  background: var(--bg-1);
  color: var(--text-2);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.45;
  text-align: left;
  white-space: normal;
  box-shadow: 4px 4px 0 0 color-mix(in srgb, var(--c-cyan) 25%, transparent);
  transform: translateX(-50%);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.12s ease, visibility 0.12s ease;
}

.learn-term:hover .learn-term__tip,
.learn-term:focus-visible .learn-term__tip,
.learn-term.is-open .learn-term__tip {
  opacity: 1;
  visibility: visible;
}

@media (prefers-reduced-motion: reduce) {
  .learn-term__tip {
    transition: none;
  }
}

.learn-token-panel,
.learn-code__panel,
.learn-arch__panel {
  margin: 0;
  padding: 0.75rem 1rem;
  border-top: 1px solid color-mix(in srgb, #fff 10%, transparent);
  font-size: 0.9rem;
  color: #e5e7eb;
  background: color-mix(in srgb, #22d3ee 10%, transparent);
}

.learn-token-panel[hidden],
.learn-code__panel[hidden],
.learn-arch__panel[hidden] {
  display: none;
}

/* ---------- Code lines ---------- */
.learn-code__line {
  display: block;
  min-width: max-content;
}

.learn-code__line--hl,
.learn-code__line[data-line-tip] {
  background: color-mix(in srgb, #22d3ee 12%, transparent);
}

.learn-code__line[data-line-tip] {
  cursor: pointer;
}

.learn-code__line[data-line-tip]:hover,
.learn-code__line[data-line-tip]:focus-visible {
  background: color-mix(in srgb, #22d3ee 22%, transparent);
  outline: none;
}

.learn-code__ln {
  display: inline-block;
  width: 2.2rem;
  margin-right: 0.75rem;
  color: #6b7280;
  user-select: none;
}

.learn-code__line code {
  background: transparent;
  color: #e5e7eb;
  padding: 0;
  font-size: inherit;
}

/* ---------- Compare ---------- */
.learn-compare {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0;
}

@media (min-width: 768px) {
  .learn-compare {
    grid-template-columns: 1fr 1fr;
  }
  .learn-compare__why {
    grid-column: 1 / -1;
  }
}

.learn-compare__label {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-3);
  margin: 0 0 0.35rem;
}

.learn-compare__why {
  padding: 0.85rem 1rem;
  border: 2px solid var(--border-1);
  background: var(--bg-1);
  color: var(--text-2);
}

/* ---------- File explorer ---------- */
.learn-explorer__ui {
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 768px) {
  .learn-explorer__ui {
    grid-template-columns: minmax(10rem, 14rem) minmax(0, 1fr);
    align-items: start;
  }
}

.learn-explorer__tree {
  border: 1px solid var(--border-1);
  background: var(--bg-2);
  padding: 0.5rem;
  max-height: 22rem;
  overflow: auto;
}

.learn-explorer__mobile {
  display: none;
  width: 100%;
  margin-bottom: 0.5rem;
  padding: 0.55rem 0.75rem;
  border: 2px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-1);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.8rem;
}

@media (max-width: 767px) {
  .learn-explorer__tree {
    display: none;
  }
  .learn-explorer__mobile {
    display: block;
  }
}

.learn-tree-folder,
.learn-tree-file {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  color: var(--text-2);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.78rem;
  padding: 0.3rem 0.4rem;
  cursor: pointer;
}

.learn-tree-folder {
  color: var(--text-3);
  cursor: default;
}

.learn-tree-file[aria-current='true'],
.learn-tree-file:hover,
.learn-tree-file:focus-visible {
  color: var(--c-cyan);
  background: color-mix(in srgb, var(--c-cyan) 10%, transparent);
  outline: none;
}

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

.learn-explorer__viewer .learn-code {
  margin: 0;
}

/* ---------- Permissions / port / arch ---------- */
.learn-perms__string {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 1.1rem;
}

.learn-perms__seg {
  border: 1px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-1);
  padding: 0.35rem 0.5rem;
  cursor: pointer;
  font: inherit;
}

.learn-perms__seg:hover,
.learn-perms__seg:focus-visible,
.learn-perms__seg.is-active {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  outline: none;
}

.learn-perms__type {
  color: var(--text-3);
  cursor: default;
}

.learn-perms__detail {
  margin-top: 0.85rem;
  color: var(--text-2);
  font-size: 0.95rem;
  min-height: 3rem;
}

.learn-portmap__diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  margin: 0.75rem 0 1rem;
  text-align: center;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.85rem;
}

.learn-portmap__box,
.learn-portmap__host {
  border: 2px solid var(--border-1);
  background: var(--bg-2);
  padding: 0.75rem 1.25rem;
  min-width: 12rem;
}

.learn-portmap__arrow {
  color: var(--c-cyan);
}

.learn-arch__tree {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin: 0.5rem 0;
}

.learn-arch__node {
  --indent: 0;
  margin-left: calc(var(--indent) * 1.25rem);
  text-align: left;
  border: 2px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-1);
  padding: 0.55rem 0.85rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.85rem;
  cursor: pointer;
  width: fit-content;
  max-width: 100%;
}

.learn-arch__node--static {
  cursor: default;
}

.learn-arch__node:not(.learn-arch__node--static):hover,
.learn-arch__node:not(.learn-arch__node--static):focus-visible {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  outline: none;
}

.learn-arch__node.is-active {
  border-color: var(--c-cyan);
  box-shadow: inset 3px 0 0 var(--c-cyan);
}

.learn-arch__node.is-related {
  border-color: color-mix(in srgb, var(--c-purple) 55%, var(--border-1));
}

.learn-arch__panel {
  border: 1px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-2);
  white-space: pre-wrap;
}

/* ---------- Split code/explain ---------- */
.learn-split {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0;
}

@media (min-width: 900px) {
  .learn-split {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
}

.learn-split__explain {
  padding: 1rem;
  border: 2px solid var(--border-1);
  background: var(--bg-1);
  color: var(--text-2);
}

/* ---------- Video ---------- */
.learn-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 2px solid var(--border-strong, var(--border-1));
  background: var(--bg-2);
  overflow: hidden;
}

.learn-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.learn-video-slot__caption {
  margin: 0 0 0.75rem;
  color: var(--text-2);
}

.learn-video-source[hidden] {
  display: none !important;
}

/* ---------- Related / pager ---------- */
.learn-related-grid {
  display: grid;
  gap: 0.75rem;
}

.learn-related-card {
  display: block;
  padding: 1rem;
  border: 2px solid var(--border-1);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}

.learn-related-card:hover,
.learn-related-card:focus-visible {
  border-color: var(--c-cyan);
  outline: none;
}

.learn-related-card__eyebrow {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-3);
  margin: 0 0 0.35rem;
}

.learn-blog-cta {
  margin: 2rem 0;
  padding: 1.25rem;
  border: 2px solid color-mix(in srgb, var(--c-purple) 40%, var(--border-1));
  background: var(--bg-1);
}

.learn-blog-cta__eyebrow {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--c-purple);
  margin: 0 0 0.5rem;
}

/* Prose containment */
.learn-main .prose {
  max-width: none;
}

.learn-main .prose > .learn-terminal,
.learn-main .prose > .learn-code,
.learn-main .prose > .learn-card,
.learn-main .prose > .learn-explorer,
.learn-main .prose > .learn-compare,
.learn-main .prose > .learn-quiz,
.learn-main .prose > .learn-order,
.learn-main .prose > .learn-sim,
.learn-main .prose > .learn-steps,
.learn-main .prose > .learn-arch {
  max-width: 100%;
}

@media (max-width: 767px) {
  .learn-terminal__cmd,
  .learn-terminal__output,
  .learn-code__pre {
    font-size: 0.75rem;
    -webkit-overflow-scrolling: touch;
  }
}

/* ---------- Quiz / knowledge check ---------- */
.learn-quiz,
.learn-order,
.learn-sim,
.learn-steps {
  margin: 1.5rem 0;
  padding: 1.1rem 1.15rem 1.25rem;
  border: 2px solid var(--border-1);
  background: var(--bg-1);
}

.learn-quiz.is-complete,
.learn-order.is-complete,
.learn-sim.is-complete,
.learn-steps.is-complete {
  border-color: color-mix(in srgb, #86efac 45%, var(--border-1));
}

.learn-quiz__q,
.learn-order__prompt {
  margin: 0.35rem 0 1rem;
  font-size: 1.05rem;
  color: var(--text-1);
}

.learn-quiz__options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.learn-quiz__option {
  text-align: left;
  padding: 0.7rem 0.9rem;
  border: 2px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-1);
  cursor: pointer;
  font: inherit;
}

.learn-quiz__option:hover,
.learn-quiz__option:focus-visible {
  border-color: var(--c-cyan);
  outline: none;
}

.learn-quiz__option.is-correct {
  border-color: #86efac;
  background: color-mix(in srgb, #86efac 12%, var(--bg-2));
}

.learn-quiz__option.is-wrong {
  border-color: #f87171;
  background: color-mix(in srgb, #f87171 10%, var(--bg-2));
}

.learn-quiz__feedback {
  margin-top: 0.85rem;
  padding: 0.75rem 0.9rem;
  border: 2px solid var(--border-1);
  font-size: 0.95rem;
  color: var(--text-2);
}

.learn-quiz__feedback.is-correct {
  border-color: #86efac;
  color: var(--text-1);
}

.learn-quiz__feedback.is-wrong {
  border-color: #f87171;
}

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

/* ---------- Ordering ---------- */
.learn-order__chosen {
  margin: 0 0 0.75rem;
  padding-left: 1.25rem;
  min-height: 1.5rem;
  color: var(--text-1);
}

.learn-order__pool {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.learn-order__chip {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.85rem;
  padding: 0.45rem 0.7rem;
  border: 2px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-1);
  cursor: pointer;
}

.learn-order__chip:hover:not(:disabled),
.learn-order__chip:focus-visible:not(:disabled) {
  border-color: var(--c-cyan);
  outline: none;
}

.learn-order__chip:disabled {
  opacity: 0.4;
  cursor: default;
}

/* ---------- Terminal simulator ---------- */
.learn-sim__avail {
  margin: 0 0 0.65rem;
  color: var(--text-3);
}

.learn-sim__intro {
  margin: 0.25rem 0 0.75rem;
  color: var(--text-2);
}

.learn-sim__screen {
  max-height: 16rem;
  overflow: auto;
  padding: 0.85rem 1rem;
  border: 2px solid var(--border-strong, var(--border-1));
  background: #0b1220;
  color: #e5e7eb;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.82rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.learn-sim__cmd {
  color: #f9fafb;
}

.learn-sim__out {
  color: #9ca3af;
  margin-top: 0.25rem;
}

.learn-sim__err {
  color: #fca5a5;
  margin-top: 0.25rem;
}

.learn-sim__form {
  margin-top: 0;
  border: 2px solid var(--border-strong, var(--border-1));
  border-top: 0;
  background: #0b1220;
}

.learn-sim__prompt {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  padding: 0.55rem 0.85rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.82rem;
  color: #67e8f9;
}

.learn-sim__input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: #f9fafb;
  font: inherit;
  outline: none;
}

.learn-sim__explain {
  margin: 0.65rem 0 0;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-2);
  font-size: 0.9rem;
}

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

/* ---------- Step sequence ---------- */
.learn-steps__list {
  list-style: none;
  margin: 0.5rem 0 1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.learn-steps__item {
  padding: 0.85rem 1rem;
  border: 2px solid var(--border-1);
  background: var(--bg-2);
}

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

.learn-steps__label {
  margin: 0;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

.learn-steps__title {
  margin: 0.2rem 0 0.5rem;
  font-size: 1.05rem;
}

.learn-steps__body {
  color: var(--text-2);
}

.learn-steps__body p:last-child {
  margin-bottom: 0;
}

/* ---------- Nav done / mastery / palette ---------- */
.learn-nav-item--done .learn-nav-marker {
  color: #86efac;
}

.learn-mastery {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-3);
  margin: 0.5rem 0 0;
}

.learn-palette-open {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 55;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
}

.learn-palette {
  position: fixed;
  inset: 0;
  z-index: 70;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 1rem 1rem;
  background: color-mix(in srgb, #000 55%, transparent);
}

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

.learn-palette__panel {
  width: min(36rem, 100%);
  border: 2px solid var(--border-1);
  background: var(--bg-1);
  box-shadow: var(--pixel-shadow, 4px 4px 0 0 color-mix(in srgb, var(--c-cyan) 25%, transparent));
}

.learn-palette__input {
  width: 100%;
  padding: 0.9rem 1rem;
  border: 0;
  border-bottom: 2px solid var(--border-1);
  background: var(--bg-2);
  color: var(--text-1);
  font: inherit;
  outline: none;
}

.learn-palette__input:focus {
  border-color: var(--c-cyan);
}

.learn-palette__list {
  list-style: none;
  margin: 0;
  padding: 0.35rem;
  max-height: 18rem;
  overflow: auto;
}

.learn-palette__list a {
  display: block;
  padding: 0.65rem 0.75rem;
  text-decoration: none;
  color: var(--text-1);
  border: 2px solid transparent;
}

.learn-palette__list a:hover,
.learn-palette__list a:focus-visible {
  border-color: var(--c-cyan);
  outline: none;
}

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

.learn-palette__hint {
  margin: 0;
  padding: 0.55rem 0.85rem;
  border-top: 1px solid var(--border-1);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  color: var(--text-3);
}

@media (max-width: 767px) {
  .learn-sim__screen,
  .learn-sim__prompt {
    font-size: 0.75rem;
  }

  .learn-arch__tree {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .learn-progress__bar,
  .learn-module-card,
  .learn-curriculum__item,
  .learn-quiz__option,
  .learn-arch__node {
    transition: none;
  }
}