/* Learn glossary — Tycoon-style term pages on Neuro OS surface */

.pa-learn-page {
  padding: 2.5rem 0 4rem;
}

.pa-learn-shell {
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.pa-learn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
  font-size: 0.88rem;
  color: var(--po-muted);
  text-decoration: none;
}

.pa-learn-back:hover {
  color: var(--po-text);
}

.pa-learn-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--po-muted-soft);
}

.pa-learn-title {
  margin: 0 0 1rem;
  font-size: clamp(1.85rem, 4vw, 2.45rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.pa-learn-short {
  margin: 0 0 2rem;
  padding: 1rem 1.15rem;
  border-radius: 0.65rem;
  border: 1px solid var(--po-card-border);
  background: var(--po-card);
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--po-text);
}

.pa-learn-section {
  padding: 2rem 0 0;
  border-top: 1px solid var(--po-line);
}

.pa-learn-section h2 {
  margin: 0 0 0.85rem;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.pa-learn-section p {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--po-muted);
}

.pa-learn-section ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--po-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.pa-learn-section li + li {
  margin-top: 0.45rem;
}

.pa-learn-related {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pa-learn-related a {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--po-card-border);
  background: var(--po-card);
  font-size: 0.82rem;
  color: var(--po-text);
  text-decoration: none;
}

.pa-learn-related a:hover {
  border-color: var(--po-muted-soft);
}

.pa-learn-faq details {
  border-bottom: 1px solid var(--po-line);
  padding: 0.75rem 0;
}

.pa-learn-faq summary {
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--po-text);
  list-style: none;
}

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

.pa-learn-faq p {
  margin: 0.65rem 0 0;
  font-size: 0.92rem;
}

.pa-learn-cta {
  margin-top: 2.5rem;
  padding: 1.35rem 1.25rem;
  border-radius: 0.75rem;
  border: 1px solid var(--po-card-border);
  background: var(--po-card);
  text-align: center;
}

.pa-learn-cta p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: var(--po-muted);
}

.pa-learn-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
}

/* Index */
.pa-learn-index-hero {
  max-width: 46rem;
  margin: 0 auto 2.5rem;
  padding: 2.5rem 1.25rem 0;
  text-align: center;
}

.pa-learn-index-hero h1 {
  margin: 0 0 0.65rem;
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
}

.pa-learn-index-hero p {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--po-muted);
}

.pa-learn-grid {
  display: grid;
  gap: 0.85rem;
  max-width: 52rem;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

@media (min-width: 640px) {
  .pa-learn-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.pa-learn-card {
  display: block;
  padding: 1.1rem 1.15rem;
  border-radius: 0.65rem;
  border: 1px solid var(--po-card-border);
  background: var(--po-card);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}

.pa-learn-card:hover {
  border-color: var(--po-muted-soft);
}

.pa-learn-card h2 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--po-text);
}

.pa-learn-card p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--po-muted);
}

.pa-learn-index-section {
  max-width: 52rem;
  margin: 0 auto 2.5rem;
  padding: 0 1.25rem;
}

.pa-learn-section-title {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--po-text);
}