.learning {
  padding-top: 64px;
}
.learn-hero {
  max-width: 950px;
  padding: 32px 0 64px;
}
.learn-hero h1 {
  font-size: clamp(2.6rem, 6vw, 5.3rem);
  line-height: 1.06;
  letter-spacing: -0.05em;
  margin: 24px 0;
}
.lead {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  line-height: 1.65;
  max-width: 740px;
  color: #c8c8c3;
}
.small,
.breadcrumb {
  font-size: 0.85rem;
  color: #aaa;
}
.breadcrumb a,
.sources a,
.vendor-card a {
  color: #c4d8df;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.article-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}
.contents {
  position: sticky;
  top: 100px;
  display: grid;
  gap: 16px;
  font-size: 0.85rem;
  line-height: 1.5;
}
.contents strong {
  letter-spacing: 0.12em;
  font-size: 0.7rem;
  color: #aaa;
}
.prose {
  min-width: 0;
  max-width: 900px;
}
.prose section {
  scroll-margin-top: 100px;
  margin-bottom: 48px;
}
.prose h2 {
  font-size: 1.8rem;
  line-height: 1.2;
  margin: 0 0 20px;
  letter-spacing: -0.03em;
}
.prose p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #c9cac8;
  margin: 0 0 18px;
}
.guide-grid,
.vendor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}
.guide-card,
.vendor-card {
  display: block;
  background: #202225;
  border: 1px solid #414345;
  border-radius: 12px;
  padding: 28px;
  min-width: 0;
}
.guide-card:hover {
  border-color: #b7cbd1;
}
.guide-card h2 {
  font-size: 1.6rem;
  line-height: 1.25;
  margin: 18px 0;
}
.guide-card p,
.vendor-card p {
  color: #c3c5c4;
  line-height: 1.7;
}
.guide-card .text-link {
  display: block;
  margin-top: 24px;
}
.vendor-card h3 {
  font-size: 1.3rem;
  margin: 16px 0;
}
.vendor-card a {
  font-size: 0.9rem;
}
.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.filters button {
  padding: 10px 14px;
  border: 1px solid #555;
  border-radius: 6px;
  background: transparent;
  color: #eee;
  cursor: pointer;
  font: inherit;
}
.filters button[aria-pressed="true"] {
  background: #deddd6;
  color: #202225;
}
.vendor-card[hidden] {
  display: none;
}
.learn-cta,
.download {
  margin: 64px 0;
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid #647c87;
  border-radius: 12px;
  background: #202225;
}
.learn-cta h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  max-width: 700px;
  line-height: 1.2;
  margin: 20px 0;
}
.learn-cta p {
  max-width: 650px;
  line-height: 1.75;
  color: #d0d0cc;
}
.learn-actions {
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 24px;
}
.download {
  margin-top: 0;
}
.download p {
  margin: 16px 0;
}
.learn-footer {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 64px;
  padding-bottom: 32px;
  font-size: 0.85rem;
  color: #aaa;
}
.sources {
  border-top: 1px solid #444;
  padding-top: 32px;
}
.sources li {
  margin-bottom: 12px;
}
.learning a:focus-visible,
.learning button:focus-visible {
  outline: 2px solid #c4d8df;
  outline-offset: 5px;
}
.learning nav a {
  overflow-wrap: anywhere;
}
@media (max-width: 800px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .contents {
    position: static;
    border-block: 1px solid #444;
    padding: 24px 0;
  }
  .learning {
    padding-top: 24px;
  }
  .learn-hero {
    padding-bottom: 32px;
  }
  .guide-grid,
  .vendor-grid {
    grid-template-columns: 1fr;
  }
  .site-header .navigation {
    flex-wrap: wrap;
    gap: 16px;
  }
  .guide-card,
  .vendor-card {
    padding: 22px;
  }
  .learn-cta {
    margin: 40px 0;
  }
  .learn-actions .button {
    white-space: normal;
  }
  .download .button {
    white-space: normal;
    text-align: center;
  }
}