/* ============================================================
   Section landing "explorer"
   A two-pane layout for the section index pages (Vibe Coding,
   Mathematics, Neuroscience): a list of articles on the left and
   a sticky live preview on the right that updates on hover/focus.
   Colours come from Material's CSS variables so it adapts to the
   light/dark toggle automatically. Collapses to stacked cards on
   narrow screens (preview hidden, descriptions shown in full).
   ============================================================ */

.md-typeset .article-explorer {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 1.6rem;
  margin: 1.6rem 0 1rem;
  align-items: start;
}

/* ---------- left: the list ---------- */
.md-typeset .article-list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.md-typeset .article-group {
  margin: 1.15rem 0 0.25rem;
  padding: 0 0.25rem;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--md-default-fg-color--light);
}
.md-typeset .article-group:first-child { margin-top: 0; }

.md-typeset a.article-item {
  display: block;
  padding: 0.6rem 0.8rem;
  border: 1px solid transparent;
  border-left: 3px solid transparent;
  border-radius: 0.55rem;
  color: var(--md-default-fg-color);
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease,
              transform 0.12s ease;
}
.md-typeset a.article-item:hover,
.md-typeset a.article-item.is-active {
  background-color: var(--md-code-bg-color);
  border-color: var(--md-default-fg-color--lightest);
  border-left-color: var(--md-default-fg-color);
  transform: translateX(2px);
}
.md-typeset .article-item__title {
  display: block;
  font-weight: 600;
  font-size: 19px;
  line-height: 1.3;
}
.md-typeset .article-item__desc {
  margin-top: 0.15rem;
  font-size: 19px;
  line-height: 1.45;
  color: var(--md-default-fg-color--light);
  /* one line on desktop — the preview pane carries the full text */
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}

/* ---------- right: the sticky preview ---------- */
.md-typeset .article-preview {
  position: sticky;
  top: 4.8rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.85rem;
  overflow: hidden;
  background-color: var(--md-default-bg-color);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.07);
}
.md-typeset .article-preview__accent {
  height: 6px;
  background: linear-gradient(90deg, #52525b, #18181b);
}
.md-typeset .article-preview__body {
  padding: 1.5rem 1.6rem 1.7rem;
}
.md-typeset .article-preview__eyebrow {
  display: inline-block;
  margin-bottom: 0.65rem;
  padding: 0.2rem 0.6rem;
  border-radius: 2rem;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--md-default-fg-color);
  background: rgba(113, 113, 122, 0.16);
}
.md-typeset .article-preview__title {
  margin: 0 0 0.55rem;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--md-default-fg-color);
}
.md-typeset .article-preview__desc {
  margin: 0;
  font-size: 19px;
  line-height: 1.7;
  color: var(--md-default-fg-color--light);
}
.md-typeset a.article-preview__link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1.4rem;
  padding: 0.5rem 1.05rem;
  border-radius: 2rem;
  background: linear-gradient(135deg, #3f3f46, #18181b);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.md-typeset a.article-preview__link:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ---------- responsive: stack to cards, drop the preview ---------- */
@media screen and (max-width: 59.9375em) {
  .md-typeset .article-explorer {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .md-typeset .article-preview { display: none; }
  .md-typeset a.article-item {
    background-color: var(--md-code-bg-color);
    border-color: var(--md-default-fg-color--lightest);
    margin-bottom: 0.2rem;
  }
  .md-typeset a.article-item:hover {
    transform: none;
  }
  .md-typeset .article-item__desc { -webkit-line-clamp: 3; }
}

/* ---------- home page section cards ---------- */
.md-typeset .home-card {
  flex: 1;
  min-width: 250px;
  display: block;
  padding: 1.5rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.8rem;
  text-decoration: none;
  color: inherit;
  background: var(--md-default-bg-color);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.md-typeset .home-card:hover {
  transform: translateY(-3px);
  border-color: var(--md-default-fg-color);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}
.md-typeset .home-card h3 { margin-top: 0; margin-bottom: 0.4rem; }
.md-typeset .home-card p {
  margin: 0;
  font-size: 19px;
  line-height: 1.6;
  color: var(--md-default-fg-color--light);
}