.learn {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 72px 24px 96px;
  font-size: 1rem;
  line-height: 1.7;
}

.learn [id] {
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.learn h1,
.learn h2,
.learn h3 {
  font-family: var(--font-main);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.learn p {
  color: var(--text-secondary);
}

.learn a:not(.btn) {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
}

.learn a:not(.btn):hover {
  border-color: var(--accent);
}

.learn em {
  color: var(--text-primary);
  font-style: normal;
  font-weight: 500;
}

.learn strong {
  color: var(--text-primary);
  font-weight: 600;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
}


.learn-hero {
  padding-bottom: 56px;
  border-bottom: 1px solid var(--border-color);
}

.learn-hero h1 {
  max-width: 14em;
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  font-weight: 700;
}

.lead {
  max-width: 38em;
  margin-top: 20px;
  font-size: 1.12rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-actions .btn,
.learn-footer .btn {
  height: 48px;
  padding: 0 22px;
}

.btn-outline {
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  background: var(--card-bg);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 40px;
}

.learn .toc a {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  transition: color 0.2s, border-color 0.2s;
}

.learn .toc a:hover {
  color: var(--accent);
  border-color: var(--accent);
}


.learn-section {
  padding: 64px 0 8px;
}

.learn-section h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.learn-section > p {
  max-width: 44em;
}

.sub-heading {
  margin: 40px 0 10px;
  font-size: 1.2rem;
  font-weight: 600;
}

.footnote {
  margin-top: 12px;
  font-size: 0.82rem;
}


.card-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.card-grid.three {
  grid-template-columns: repeat(3, 1fr);
}

.card-grid.two {
  grid-template-columns: repeat(2, 1fr);
  margin-top: 20px;
}

.info-card {
  padding: 22px;
  border-radius: var(--radius);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  transition: border-color 0.2s, transform 0.2s;
}

.info-card:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  transform: translateY(-2px);
}

.info-card > i {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 14px;
  border-radius: 12px;
  color: var(--accent);
  background: var(--accent-soft);
}

.info-card h3 {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 1.05rem;
  font-weight: 600;
}

.info-card p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.info-card.compact {
  padding: 18px 20px;
}

.tag {
  padding: 2px 8px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--accent);
  background: var(--accent-soft);
}


.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
  list-style: none;
}

.steps li {
  display: flex;
  gap: 16px;
  padding: 22px;
  border-radius: var(--radius);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
}

.step-num {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--on-accent);
  background: var(--accent);
}

.steps h3 {
  margin-bottom: 4px;
  font-size: 1.05rem;
  font-weight: 600;
}

.steps p {
  font-size: 0.9rem;
  line-height: 1.6;
}


.key-list {
  display: grid;
  gap: 2px;
  margin-top: 24px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.key-list > div {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 16px;
  padding: 14px 20px;
  background: var(--card-bg);
}

.key-list dt {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-main);
  font-weight: 600;
}

.key-list dd {
  font-size: 0.92rem;
  color: var(--text-secondary);
}


.table-wrap {
  margin-top: 20px;
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  background: var(--card-bg);
}

.algo-table {
  width: 100%;
  min-width: 860px;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.algo-table th,
.algo-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border-color);
}

.algo-table thead th {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--input-bg);
  white-space: nowrap;
}

.algo-table tbody tr:last-child > * {
  border-bottom: none;
}

.algo-table tbody th {
  font-family: var(--font-main);
  font-weight: 600;
  white-space: nowrap;
}

.algo-table td {
  color: var(--text-secondary);
}

.algo-table code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: nowrap;
  color: var(--text-primary);
}

.algo-table td:last-child {
  min-width: 240px;
}

.algo-table .yes,
.algo-table .no {
  white-space: nowrap;
}

.algo-table .yes i {
  color: var(--accent);
}

.algo-table .no i {
  color: var(--danger);
}


.faq {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.faq details {
  border-radius: 14px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  transition: border-color 0.2s;
}

.faq details[open] {
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  font-family: var(--font-main);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  background: var(--accent-soft);
  transition: transform 0.25s;
}

.faq details[open] summary::after {
  transform: rotate(45deg);
}

.faq details > p,
.faq details > div {
  padding: 0 20px 20px;
  font-size: 0.94rem;
}

.shortcut-table {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 10px 20px;
  align-items: center;
  color: var(--text-secondary);
}

.shortcut-table kbd {
  opacity: 0.8;
}


.learn-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 72px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}


@media (max-width: 760px) {
  .learn {
    padding: 48px 16px 72px;
  }

  .card-grid.three,
  .card-grid.two,
  .steps {
    grid-template-columns: 1fr;
  }

  .key-list > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .learn-section {
    padding-top: 48px;
  }
}