.filter-bar {
  position: sticky;
  top: 70px;
  z-index: 50;
  padding: 1.4rem 0;
  background: rgba(250, 248, 243, 0.92);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--grey-line);
}
.filter-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}
.chip {
  padding: 0.55rem 1.1rem;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 100px;
  border: 1px solid var(--grey-line);
  background: var(--white);
  color: var(--graphite);
  cursor: pointer;
  transition: all var(--t-fast) var(--ease);
}
.chip:hover { border-color: var(--gold); color: var(--gold-deep); }
.chip.active {
  background: var(--ink);
  color: var(--cream);
  border-color: var(--ink);
}

.library {
  padding: 5rem 0 6rem;
}

.cat-section {
  margin-bottom: 5rem;
  scroll-margin-top: 140px;
}
.cat-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--grey-line);
}
.cat-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 300;
  letter-spacing: -0.01em;
}
.cat-count {
  font-family: var(--serif);
  font-style: italic;
  color: var(--gold-deep);
  font-size: 1.1rem;
  white-space: nowrap;
}
.cat-intro {
  max-width: 70ch;
  color: var(--grey);
  font-size: 1rem;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.bio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (max-width: 800px) { .bio-grid { grid-template-columns: 1fr; } }
.bio {
  background: var(--white);
  border: 1px solid var(--grey-line);
  border-radius: var(--radius-lg);
  padding: 1.6rem 1.8rem;
  transition: all var(--t-fast) var(--ease);
  display: flex;
  flex-direction: column;
}
.bio:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.bio-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  gap: 1rem;
}
.bio-name {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.2;
}
.bio-abbr {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--gold-deep);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.bio-desc {
  font-size: 0.9rem;
  color: var(--graphite);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1rem;
}
.bio-range {
  font-size: 0.78rem;
  color: var(--grey);
  padding-top: 0.8rem;
  border-top: 1px solid var(--grey-line);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.bio-range strong {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  color: var(--gold-deep);
}

.bio.featured {
  background: var(--ink);
  color: var(--bone);
  border-color: var(--graphite);
}
.bio.featured .bio-name { color: var(--cream); }
.bio.featured .bio-abbr { color: var(--gold-light); }
.bio.featured .bio-desc { color: var(--grey-soft); }
.bio.featured .bio-range { color: var(--grey-soft); border-top-color: var(--graphite); }
.bio.featured .bio-range strong { color: var(--gold-light); }
.bio.featured:hover { border-color: var(--gold); }

.toc {
  position: sticky;
  top: 140px;
  align-self: start;
}
.toc-title {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-deep);
  margin-bottom: 1.2rem;
}
.toc ul { list-style: none; }
.toc li { margin-bottom: 0.5rem; }
.toc a {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--graphite);
  padding: 0.4rem 0;
  border-bottom: 1px solid transparent;
  transition: all var(--t-fast) var(--ease);
}
.toc a:hover { color: var(--gold-deep); border-bottom-color: var(--gold); }
.toc a span { color: var(--grey); font-family: var(--serif); font-style: italic; font-size: 0.85rem; }

.library-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 4rem;
}
@media (max-width: 900px) {
  .library-layout { grid-template-columns: 1fr; gap: 1rem; }
  .toc { display: none; }
}