/* Learn library — design v1 (logical properties, light + dark) */

:root {
  --learn-orange: #ff6b1a;
  --learn-orange-soft: color-mix(in srgb, #ff6b1a 14%, transparent);
  --learn-amber: #c47a00;
  --learn-amber-soft: color-mix(in srgb, #c47a00 12%, transparent);
  --learn-black: #0d0d0d;
  --learn-white: #ffffff;
  --learn-space-1: 8px;
  --learn-space-2: 16px;
  --learn-space-3: 24px;
  --learn-space-4: 48px;
  --learn-space-5: 72px;
  --learn-measure: 720px;
  --learn-shell: 1120px;
  --learn-divider: color-mix(in srgb, var(--text) 12%, transparent);
  --cat: var(--learn-orange);
}

/* Light: white page, near-black text (AA) */
[data-theme='light'] body.learn-body {
  --bg: #ffffff;
  --surface: #f6f6f8;
  --text: #141414;
  --muted: #4a4a55;
  --border: rgba(0, 0, 0, 0.1);
  --learn-divider: rgba(0, 0, 0, 0.1);
  background: #ffffff;
  color: #141414;
}

[data-theme='dark'] body.learn-body {
  --learn-orange-soft: color-mix(in srgb, #ff6b1a 22%, transparent);
  --learn-amber-soft: color-mix(in srgb, #e0a23a 18%, transparent);
  --learn-divider: rgba(255, 255, 255, 0.1);
}

body.learn-body {
  font-family: Cairo, Tahoma, sans-serif;
}

.learn-shell {
  max-width: var(--learn-measure);
  margin-inline: auto;
  padding-inline: var(--learn-space-2);
  padding-block: var(--learn-space-3) var(--learn-space-5);
  width: 100%;
  box-sizing: border-box;
  min-width: 0;
}

.learn-shell--wide {
  max-width: var(--learn-shell);
}

.learn-main,
.learn-article-layout,
.learn-article-col,
.learn-prose,
.learn-section,
.learn-hub-hero,
.learn-card-grid,
.learn-cats,
.learn-card,
.learn-card-body {
  min-width: 0;
  max-width: 100%;
}

.learn-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--learn-space-2);
  flex-wrap: wrap;
  margin-block-end: var(--learn-space-3);
  padding-block-end: var(--learn-space-2);
  border-block-end: 1px solid var(--learn-divider);
  min-width: 0;
  max-width: 100%;
}

.learn-brand {
  min-width: 0;
  max-width: 100%;
}

.learn-brand img {
  height: 40px;
  width: auto;
  max-width: min(220px, 55vw);
  object-fit: contain;
}

[data-theme='light'] .lockup-dark {
  display: none;
}
[data-theme='dark'] .lockup-light {
  display: none;
}

.learn-foot {
  margin-block-start: var(--learn-space-5);
  padding-block-start: var(--learn-space-3);
  border-block-start: 1px solid var(--learn-divider);
  color: var(--muted);
  min-width: 0;
  max-width: 100%;
  overflow-wrap: anywhere;
  font-size: 13px;
  text-align: center;
  background: transparent;
}

.learn-foot nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--learn-space-1) var(--learn-space-2);
  margin-block-end: var(--learn-space-1);
  background: transparent;
}

.learn-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 var(--learn-space-2);
  list-style: none;
  padding: 0;
}

.learn-crumbs a {
  color: var(--muted);
}

.learn-crumbs li:not(:last-child)::after {
  content: '›';
  margin-inline-start: 0.5rem;
  opacity: 0.55;
}

html[lang='ar'] .learn-crumbs li:not(:last-child)::after {
  content: '‹';
}

.learn-chip {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cat, var(--learn-orange));
  background: color-mix(in srgb, var(--cat, var(--learn-orange)) 16%, transparent);
  border-radius: 999px;
  padding: 4px 10px;
  margin-block-end: var(--learn-space-2);
}

.learn-draft-banner {
  background: var(--learn-orange-soft);
  border: 1px solid color-mix(in srgb, var(--learn-orange) 35%, transparent);
  border-radius: 10px;
  padding: var(--learn-space-1) var(--learn-space-2);
  font-size: 0.9rem;
  margin-block-end: var(--learn-space-2);
}

/* —— Article header —— */
.learn-article-header {
  max-width: var(--learn-measure);
  margin-block-end: var(--learn-space-3);
  padding-block-end: var(--learn-space-3);
  border-block-end: 1px solid var(--learn-divider);
}

.learn-article-header h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.25;
  margin: 0 0 var(--learn-space-2);
  color: var(--text);
  font-weight: 700;
}

.learn-summary {
  margin: 0 0 var(--learn-space-2);
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.6;
}

.learn-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--learn-space-1) var(--learn-space-2);
  align-items: center;
  font-size: 0.88rem;
  color: var(--muted);
}

.learn-ltr {
  direction: ltr;
  unicode-bidi: isolate;
  display: inline;
}

/* Header/nav bdi may wrap; prose equations stay on one line (see below). */
.learn-article-header bdi,
.learn-toc bdi,
.learn-crumbs bdi {
  display: inline;
  overflow-wrap: anywhere;
}

/* Inline LTR equations — never break mid-token; page scroll stays vertical. */
.learn-prose bdi[dir='ltr'],
.learn-quick bdi[dir='ltr'],
.learn-faq bdi[dir='ltr'],
.learn-card bdi[dir='ltr'] {
  display: inline-block;
  vertical-align: baseline;
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: normal;
  max-width: 100%;
}

/* Quick answer */
.learn-quick {
  max-width: var(--learn-measure);
  margin-block: 0 var(--learn-space-4);
  padding: var(--learn-space-2) var(--learn-space-3);
  border-inline-start: 4px solid var(--learn-orange);
  background: var(--learn-orange-soft);
  border-radius: 0 12px 12px 0;
}

html[lang='ar'] .learn-quick {
  border-radius: 12px 0 0 12px;
}

.learn-quick-label {
  margin: 0 0 var(--learn-space-1);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--learn-orange);
}

.learn-quick-body {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
}

/* Layout: sticky TOC start-side */
.learn-article-layout {
  display: grid;
  gap: var(--learn-space-3);
  align-items: start;
}

.learn-toc--rail {
  display: none;
}

.learn-toc--mobile {
  margin-block-end: var(--learn-space-3);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--learn-space-2);
  background: transparent;
}

.learn-toc--mobile summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.learn-toc-title {
  margin: 0 0 var(--learn-space-2);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.learn-toc-list {
  list-style: none;
  margin: var(--learn-space-1) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.learn-toc-item a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none !important;
  display: block;
  padding-block: 2px;
}

.learn-toc-item a:hover {
  color: var(--learn-orange);
}

.learn-toc-item--3 {
  padding-inline-start: var(--learn-space-2);
  font-size: 0.88rem;
}

@media (min-width: 1024px) {
  /* TOC is first in DOM → start side in both LTR (left) and RTL (right). */
  .learn-article-layout {
    grid-template-columns: 220px minmax(0, var(--learn-measure));
    justify-content: center;
    gap: var(--learn-space-4);
  }

  .learn-toc--rail {
    display: block;
    position: sticky;
    top: var(--learn-space-3);
    max-height: calc(100vh - 48px);
    overflow: auto;
    padding-inline-end: var(--learn-space-2);
    border-inline-end: 1px solid var(--learn-divider);
  }

  .learn-toc--mobile {
    display: none;
  }
}

/* Prose */
.learn-prose {
  max-width: var(--learn-measure);
  font-size: 18px;
  color: var(--text);
}

html[lang='ar'] .learn-prose {
  line-height: 1.9;
}

html[lang='en'] .learn-prose {
  line-height: 1.7;
}

.learn-prose > *:first-child {
  margin-block-start: 0;
}

.learn-prose p {
  margin-block: 0 1.25em;
}

.learn-h2 {
  display: flex;
  align-items: baseline;
  gap: var(--learn-space-2);
  font-size: 1.35rem;
  line-height: 1.35;
  margin-block: var(--learn-space-4) var(--learn-space-2);
  padding-block-start: var(--learn-space-3);
  border-block-start: 1px solid var(--learn-divider);
  scroll-margin-block-start: var(--learn-space-3);
  position: relative;
}

.learn-h2::before {
  content: '';
  position: absolute;
  inset-block-start: -1px;
  inset-inline-start: 0;
  width: 40px;
  height: 3px;
  background: var(--learn-orange);
  border-radius: 2px;
}

.learn-h2-num {
  flex-shrink: 0;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--learn-orange);
  font-variant-numeric: tabular-nums;
  direction: ltr;
  unicode-bidi: isolate;
}

.learn-prose h3 {
  font-size: 1.1rem;
  margin-block: var(--learn-space-3) var(--learn-space-1);
  scroll-margin-block-start: var(--learn-space-3);
}

/*
 * Lists — custom markers via absolute positioning.
 * Chromium resolves inset-inline-start on ::before to the physical LEFT even in RTL,
 * so markers are pinned with physical left/right per [dir] (html[dir] / [dir]).
 */
.learn-prose ul,
.learn-prose ol {
  margin-block: 0 1.25em;
  padding-inline-start: 0;
  list-style: none;
}

.learn-prose ul > li,
.learn-prose ol > li {
  position: relative;
  margin-block-end: 0.55em;
}

[dir='rtl'] .learn-prose ul > li,
[dir='rtl'] .learn-prose ol > li {
  padding-right: 1.5rem;
  padding-left: 0;
}

[dir='ltr'] .learn-prose ul > li,
[dir='ltr'] .learn-prose ol > li {
  padding-left: 1.5rem;
  padding-right: 0;
}

.learn-prose ul > li::before {
  content: '•';
  position: absolute;
  color: var(--learn-orange);
  font-weight: 700;
  line-height: inherit;
}

.learn-prose ol {
  counter-reset: learn-ol;
}

.learn-prose ol > li {
  counter-increment: learn-ol;
}

.learn-prose ol > li::before {
  position: absolute;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.95em;
  line-height: inherit;
  direction: ltr;
  unicode-bidi: isolate;
}

/* LTR pages: normal "1." */
[dir='ltr'] .learn-prose ol > li::before {
  content: counter(learn-ol) '.';
  min-width: 1.25em;
  text-align: end;
  left: 0;
  right: auto;
}

/*
 * RTL: digit on the start edge, period AFTER it (toward the text).
 * Split into ::before (number) + ::after (dot) so bidi cannot swap them.
 */
[dir='rtl'] .learn-prose ol > li {
  padding-right: 1.75rem;
}

[dir='rtl'] .learn-prose ol > li::before {
  content: counter(learn-ol);
  right: 0;
  left: auto;
  min-width: 0.7em;
  text-align: end;
}

/* Period sits just to the left of the digit (= after it in RTL reading). */
[dir='rtl'] .learn-prose ol > li::after {
  content: '.';
  position: absolute;
  right: 0.72em;
  top: 0;
  font-weight: 700;
  font-size: 0.95em;
  line-height: inherit;
  color: var(--muted);
}

[dir='rtl'] .learn-prose ul > li::before {
  right: 0;
  left: auto;
}

[dir='ltr'] .learn-prose ul > li::before {
  left: 0;
  right: auto;
}

.learn-prose blockquote {
  margin: 0 0 1.25em;
  padding-inline: var(--learn-space-2);
  border-inline-start: 3px solid var(--learn-divider);
  color: var(--muted);
}

/* Callouts */
.learn-callout {
  margin-block: 0 var(--learn-space-3);
  padding: var(--learn-space-2) var(--learn-space-3);
  border-radius: 12px;
  border: 1px solid var(--border);
}

.learn-callout-label {
  margin: 0 0 var(--learn-space-1);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.learn-callout p:last-child {
  margin-block-end: 0;
}

.learn-callout--key {
  border-color: color-mix(in srgb, var(--learn-orange) 40%, var(--border));
  background: var(--learn-orange-soft);
  border-inline-start: 4px solid var(--learn-orange);
}

.learn-callout--key .learn-callout-label {
  color: var(--learn-orange);
}

.learn-callout--example {
  background: var(--surface);
  border-inline-start: 4px solid var(--text);
}

.learn-callout--example .learn-callout-label {
  color: var(--muted);
}

.learn-eq {
  display: block;
  direction: ltr;
  unicode-bidi: isolate;
  text-align: start;
  margin: 0.45em 0;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  background: color-mix(in srgb, var(--text) 4%, transparent);
  font-family: ui-monospace, 'Cascadia Code', 'Segoe UI Mono', monospace;
  font-size: 0.98rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.45;
  max-width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
  overflow-wrap: anywhere;
}

.learn-callout--example .learn-eq {
  margin-inline: 0;
}

.learn-callout--warn {
  background: var(--learn-amber-soft);
  border-color: color-mix(in srgb, var(--learn-amber) 35%, var(--border));
  border-inline-start: 4px solid var(--learn-amber);
}

.learn-callout--warn .learn-callout-label {
  color: var(--learn-amber);
}

/* Shotty tip / coach callouts */
.learn-callout--shotty {
  border-color: color-mix(in srgb, var(--learn-orange) 35%, var(--border));
  background: color-mix(in srgb, var(--learn-orange-soft) 70%, var(--surface));
  border-inline-start: 4px solid var(--learn-orange);
  max-width: 100%;
  box-sizing: border-box;
  overflow-x: clip;
}

.learn-callout--shotty .learn-callout-label {
  color: var(--learn-orange);
  text-transform: none;
  letter-spacing: 0;
  font-size: 14px;
}

.learn-callout--shotty-coach {
  border-color: color-mix(in srgb, var(--text) 18%, var(--border));
  background: var(--surface);
  border-inline-start-color: color-mix(in srgb, var(--text) 45%, var(--learn-orange));
}

.learn-callout--shotty-coach .learn-callout-label {
  color: var(--text);
}

.learn-shotty-inner {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 0.75rem;
  min-width: 0;
}

.learn-shotty-img {
  flex: 0 0 auto;
  width: 80px;
  height: 80px;
  max-width: 96px;
  object-fit: contain;
  object-position: center bottom;
  border-radius: 10px;
  background: color-mix(in srgb, var(--text) 4%, transparent);
}

.learn-shotty-body {
  flex: 1 1 auto;
  min-width: 0;
}

.learn-shotty-body > :last-child {
  margin-block-end: 0;
}

@media (max-width: 360px) {
  .learn-shotty-img {
    width: 64px;
    height: 64px;
  }

  .learn-shotty-inner {
    gap: 0.55rem;
  }
}

/* Formula */
.learn-formula-card {
  margin: 0 0 var(--learn-space-3);
  padding: var(--learn-space-2) var(--learn-space-3);
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  text-align: center;
  max-width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
}

.learn-formula-card figcaption {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-block-end: var(--learn-space-1);
}

.learn-formula {
  direction: ltr;
  text-align: center;
  unicode-bidi: isolate;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  max-width: 100%;
  box-sizing: border-box;
  font-family: ui-monospace, 'Cascadia Code', 'Segoe UI Mono', monospace;
  font-size: 1rem;
  background: transparent;
  border: none;
  white-space: pre;
}

.learn-formula code {
  display: inline-block;
  max-width: 100%;
  box-sizing: border-box;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.learn-prose code {
  font-family: ui-monospace, 'Cascadia Code', 'Segoe UI Mono', monospace;
  font-size: 0.92em;
}

.learn-prose img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  display: block;
  margin-block: 0 var(--learn-space-3);
}

/* Inline SVG figures (from figures/… markdown images) */
.learn-figure {
  margin-block: 0 var(--learn-space-3);
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.learn-figure svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  font-family: inherit; /* Cairo from body.learn-body */
}

.learn-figure figcaption {
  margin-block-start: 0.55rem;
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--muted);
  text-align: center;
  max-width: 100%;
}

/* Tables — page never scrolls sideways; only this wrap may */
.learn-table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  margin-block: 0 var(--learn-space-3);
  border: 1px solid var(--border);
  border-radius: 12px;
  -webkit-overflow-scrolling: touch;
  min-width: 0;
}

.learn-prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 480px;
}

.learn-prose thead th {
  background: var(--surface);
  font-weight: 700;
  text-align: start;
  padding: 12px 14px;
  border-block-end: 1px solid var(--border);
  color: var(--text);
}

.learn-prose td {
  padding: 12px 14px;
  border-block-end: 1px solid var(--learn-divider);
  text-align: start;
}

.learn-prose tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--surface) 70%, transparent);
}

.learn-prose tbody tr:last-child td {
  border-block-end: none;
}

/* FAQ */
.learn-section {
  max-width: var(--learn-measure);
  margin-block-start: var(--learn-space-4);
  padding-block-start: var(--learn-space-3);
  border-block-start: 1px solid var(--learn-divider);
}

.learn-section-title {
  font-size: 1.25rem;
  margin: 0 0 var(--learn-space-2);
}

.learn-faq-list {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.learn-faq-item {
  border-block-end: 1px solid var(--learn-divider);
  padding: 0;
  background: transparent;
}

.learn-faq-item:last-child {
  border-block-end: none;
}

.learn-faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--learn-space-2);
  cursor: pointer;
  list-style: none;
  padding: var(--learn-space-2) var(--learn-space-3);
  font-weight: 700;
}

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

.learn-faq-icon::before {
  content: '+';
  display: inline-flex;
  width: 1.5rem;
  height: 1.5rem;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1;
}

.learn-faq-item[open] .learn-faq-icon::before {
  content: '−';
  color: var(--learn-orange);
}

.learn-faq-a {
  padding: 0 var(--learn-space-3) var(--learn-space-2);
  color: var(--muted);
  line-height: 1.7;
}

/*
 * Sources — flex row so the marker sits next to the link on the start side.
 * Safe here: each li has one element child (the <a>), so flex does not split
 * mixed Arabic/Latin text nodes the way it would in prose lists.
 */
.learn-sources-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: src;
  color: var(--muted);
  font-size: 0.92rem;
}

.learn-sources-list li {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 0.5rem;
  counter-increment: src;
  margin-block-end: 0.55em;
}

.learn-sources-list li::before {
  flex-shrink: 0;
  min-width: 1.25em;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-weight: 700;
  direction: ltr;
  unicode-bidi: isolate;
  text-align: end;
}

[dir='ltr'] .learn-sources-list li::before {
  content: counter(src) '.';
}

/* Flex item on the RTL start side: ".N" LTR puts the digit on the outer edge */
[dir='rtl'] .learn-sources-list li::before {
  content: '.' counter(src);
}

html[lang='ar'] .learn-sources-list a {
  unicode-bidi: isolate;
}

.learn-ext::after {
  content: '↗';
  margin-inline-start: 0.35em;
  font-size: 0.85em;
  opacity: 0.7;
}

/* Related + cards */
.learn-related-grid,
.learn-card-grid {
  display: grid;
  gap: var(--learn-space-2);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .learn-related-grid,
  .learn-card-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.learn-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none !important;
  transition: border-color 0.15s ease, transform 0.2s ease;
  min-width: 0;
  max-width: 100%;
}

.learn-card:hover {
  border-color: color-mix(in srgb, var(--cat, var(--learn-orange)) 50%, var(--border));
}

.learn-card-media {
  display: block;
  aspect-ratio: 1200 / 630;
  overflow: hidden;
  border-start-start-radius: 13px;
  border-start-end-radius: 13px;
  border-block-end: 1px solid var(--learn-divider);
  background: var(--surface);
  min-width: 0;
}

.learn-card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.learn-card-media--placeholder {
  display: grid;
  place-items: center;
  color: color-mix(in srgb, var(--cat, var(--learn-orange)) 85%, #fff);
  background:
    linear-gradient(
      145deg,
      color-mix(in srgb, var(--cat, var(--learn-orange)) 28%, #141414),
      #141414 70%
    );
}

@media (hover: hover) {
  @media (prefers-reduced-motion: no-preference) {
    .learn-card:hover {
      transform: translateY(-2px);
    }

    .learn-card:hover .learn-card-media img {
      transform: scale(1.03);
    }
  }
}

.learn-card-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: var(--learn-space-2) var(--learn-space-3);
  min-width: 0;
  flex: 1 1 auto;
}

.learn-card .learn-chip {
  margin-block-end: 0;
}

.learn-card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.learn-card-excerpt {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.learn-card-meta {
  margin-block-start: auto;
  font-size: 0.8rem;
  color: var(--muted);
}

.learn-card--featured {
  border-color: color-mix(in srgb, var(--cat, var(--learn-orange)) 35%, var(--border));
}

.learn-card--featured .learn-card-body {
  padding: var(--learn-space-3);
}

.learn-card--featured h3 {
  font-size: 1.35rem;
  -webkit-line-clamp: 4;
}

@media (min-width: 720px) {
  .learn-card--featured {
    flex-direction: row;
    align-items: stretch;
  }

  .learn-card--featured .learn-card-media {
    flex: 1 1 44%;
    max-inline-size: 44%;
    border-block-end: none;
    border-inline-end: 1px solid var(--learn-divider);
    border-start-end-radius: 0;
    border-end-start-radius: 13px;
  }

  .learn-card--featured .learn-card-body {
    flex: 1 1 56%;
    justify-content: center;
  }
}

/* CTA — dark card */
.learn-cta {
  max-width: var(--learn-measure);
  margin-block-start: var(--learn-space-4);
  padding: var(--learn-space-3);
  border-radius: 16px;
  background: var(--learn-black);
  color: var(--learn-white);
  border: none;
}

.learn-cta h2 {
  margin: 0 0 var(--learn-space-1);
  font-size: 1.25rem;
  color: var(--learn-white);
}

.learn-cta p {
  margin: 0 0 var(--learn-space-2);
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.98rem;
}

.learn-cta-btn {
  display: inline-block;
  background: var(--learn-orange) !important;
  color: #fff !important;
  font-weight: 700;
  padding: 10px 18px;
  border-radius: 10px;
  text-decoration: none !important;
}

/* Hub */
.learn-hub-hero {
  margin-block-end: var(--learn-space-4);
  max-width: 40rem;
}

.learn-hub-hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 var(--learn-space-2);
  line-height: 1.25;
}

.learn-hub-lead {
  margin: 0;
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.7;
}

.learn-count {
  margin: var(--learn-space-1) 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.learn-section-title-row {
  display: flex;
  align-items: center;
  gap: var(--learn-space-2);
  margin-block-end: var(--learn-space-2);
  min-width: 0;
}

.learn-section-title-row h1 {
  margin: 0;
  min-width: 0;
}

.learn-section-icon {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  inline-size: 40px;
  block-size: 40px;
  border-radius: 10px;
  color: var(--cat, var(--learn-orange));
  background: color-mix(in srgb, var(--cat, var(--learn-orange)) 16%, transparent);
}

.learn-section-icon svg {
  display: block;
}

/* Category tiles (hub only) */
.learn-cats {
  display: grid;
  gap: var(--learn-space-2);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-block-end: var(--learn-space-4);
  min-width: 0;
}

@media (min-width: 640px) {
  .learn-cats {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

.learn-cat {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: var(--learn-space-2);
  border: 2px solid transparent;
  border-radius: 14px;
  text-decoration: none !important;
  box-sizing: border-box;
  min-width: 0;
  max-width: 100%;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

/* Explicit theme surfaces so :root dark tokens cannot leak into light tiles. */
[data-theme='light'] .learn-cat {
  background: #f6f6f8;
  color: #141414;
}

[data-theme='dark'] .learn-cat {
  background: #161618;
  color: #f0f0f5;
}

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

[data-theme='light'] a.learn-cat:hover,
[data-theme='light'] a.learn-cat:focus-visible {
  background: #f0f0f3;
}

[data-theme='dark'] a.learn-cat:hover,
[data-theme='dark'] a.learn-cat:focus-visible {
  background: #1c1c1f;
}

.learn-cat-icon {
  display: grid;
  place-items: center;
  inline-size: 40px;
  block-size: 40px;
  border-radius: 10px;
  color: var(--cat);
  background: color-mix(in srgb, var(--cat) 16%, transparent);
}

.learn-cat-icon svg {
  display: block;
}

.learn-cat-label {
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.35;
}

[data-theme='light'] .learn-cat-label {
  color: #141414;
}

[data-theme='dark'] .learn-cat-label {
  color: #f0f0f5;
}

.learn-cat-desc {
  font-size: 0.86rem;
  line-height: 1.5;
}

[data-theme='light'] .learn-cat-desc,
[data-theme='light'] .learn-cat-count {
  color: #4a4a55;
}

[data-theme='dark'] .learn-cat-desc,
[data-theme='dark'] .learn-cat-count {
  color: #b4b4c0;
}

.learn-cat-count {
  margin-block-start: auto;
  font-size: 0.8rem;
}

@media (max-width: 639px) {
  .learn-cat-desc {
    display: none;
  }
}

.learn-cat--soon {
  /* No opacity — it tanks text contrast. Mute via explicit colors instead. */
  pointer-events: none;
  user-select: none;
}

[data-theme='light'] .learn-cat--soon {
  background: #f0f0f3;
}

[data-theme='dark'] .learn-cat--soon {
  background: #141416;
}

[data-theme='light'] .learn-cat--soon .learn-cat-label {
  color: #2e2e36;
}

[data-theme='dark'] .learn-cat--soon .learn-cat-label {
  color: #e4e4ec;
}

[data-theme='light'] .learn-cat--soon .learn-cat-desc {
  color: #4a4a55;
}

[data-theme='dark'] .learn-cat--soon .learn-cat-desc {
  color: #b4b4c0;
}

.learn-cat-badge {
  position: absolute;
  inset-block-start: 10px;
  inset-inline-end: 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 999px;
  padding: 2px 8px;
}

[data-theme='light'] .learn-cat-badge {
  color: #3f3f4a;
  background: color-mix(in srgb, #141414 8%, transparent);
}

[data-theme='dark'] .learn-cat-badge {
  color: #c4c4d0;
  background: color-mix(in srgb, #ffffff 10%, transparent);
}

.learn-foot-copy {
  margin: var(--learn-space-1) 0 0;
  font-size: 12px;
  color: var(--muted);
}

.learn-featured {
  margin-block-end: var(--learn-space-4);
}

.learn-featured-label {
  margin: 0 0 var(--learn-space-1);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--learn-orange);
}

.learn-hub-section {
  margin-block-end: var(--learn-space-4);
  padding-block-start: var(--learn-space-3);
  border-block-start: 1px solid var(--learn-divider);
  scroll-margin-block-start: var(--learn-space-3);
}

.learn-hub-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--learn-space-1);
  margin-block-end: var(--learn-space-1);
}

.learn-hub-section-head h2 {
  margin: 0;
  font-size: 1.25rem;
}

.learn-hub-section-head a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none !important;
  min-width: 0;
}

.learn-hub-section-head a:hover {
  color: var(--cat, var(--learn-orange));
}

.learn-hub-section-head .learn-section-icon {
  inline-size: 36px;
  block-size: 36px;
}

.learn-hub-section-desc {
  margin: 0 0 var(--learn-space-2);
  color: var(--muted);
  font-size: 0.95rem;
}

.learn-hub-view-all {
  margin: var(--learn-space-2) 0 0;
}

.learn-hub-view-all a {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--cat, var(--learn-orange));
  text-decoration: none !important;
}

.learn-hub-view-all a:hover {
  text-decoration: underline !important;
}

@media (max-width: 480px) {
  .learn-shell {
    padding-inline: 12px;
  }

  .learn-brand img {
    height: 32px;
    max-width: min(160px, 42vw);
  }

  .learn-top .lang,
  .learn-top .cta {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
  }

  .learn-foot nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 14px;
  }

  .learn-foot a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  /* Stacked comparison cards — no horizontal table scroll */
  .learn-table-wrap {
    overflow-x: visible;
    border: none;
    background: transparent;
  }

  .learn-prose table {
    display: block;
    min-width: 0;
    width: 100%;
    font-size: 0.9rem;
  }

  /* Headers duplicated via data-label on td — hide to avoid phantom overflow */
  .learn-prose thead {
    display: none;
  }

  .learn-prose tbody,
  .learn-prose tr,
  .learn-prose td {
    display: block;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
  }

  .learn-prose tbody tr {
    margin-block-end: 0.75rem;
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface);
    box-sizing: border-box;
  }

  .learn-prose tbody tr:nth-child(even) {
    background: var(--surface);
  }

  .learn-prose tbody tr:last-child td {
    border-block-end: none;
  }

  .learn-prose td {
    padding: 0.35rem 0;
    border-block-end: none;
    text-align: start;
  }

  .learn-prose td:first-child {
    font-weight: 700;
    font-size: 1.05em;
    margin-block-end: 0.35rem;
    padding-block-end: 0.45rem;
    border-block-end: 1px solid var(--learn-divider);
  }

  .learn-prose td:not(:first-child)::before {
    content: attr(data-label) ': ';
    font-weight: 600;
    color: var(--muted);
  }

  .learn-formula {
    font-size: 0.85rem;
  }

  .learn-formula-card {
    padding: var(--learn-space-2);
  }

  .learn-eq {
    font-size: 0.9rem;
    padding: 0.45rem 0.55rem;
  }

  .learn-toc--mobile {
    max-width: 100%;
  }
}

@media (max-width: 360px) {
  .learn-shell {
    padding-inline: 10px;
  }

  /* Smaller inline equations; keep baseline (overflow-x:auto on inline-block lifts it) */
  .learn-prose bdi[dir='ltr'],
  .learn-quick bdi[dir='ltr'],
  .learn-faq bdi[dir='ltr'],
  .learn-card bdi[dir='ltr'] {
    font-size: 0.9em;
    overflow: visible;
    vertical-align: baseline;
  }
}