:root {
  --paper: #fdfdfc;
  --paper-deep: #f3f3f0;
  --ink: #181817;
  --muted: #686864;
  --faint: #a9a9a4;
  --line: #d3d3ce;
  --red: #6f3029;
  --red-dark: #52231e;
  --selected: #edede9;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--serif);
  font-size: 17px;
}

button, input, select { font: inherit; }
button, select { cursor: pointer; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: -5rem;
  left: 1rem;
  background: var(--ink);
  color: var(--paper);
  padding: .7rem 1rem;
}
.skip-link:focus { top: 1rem; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.masthead {
  padding: 1.2rem clamp(1.2rem, 5vw, 5.5rem) 3.2rem;
  border-bottom: 1px solid var(--ink);
}

.masthead__rule {
  height: 1px;
  border-top: 1px solid var(--ink);
  margin-bottom: 3.6rem;
}

.masthead__inner {
  max-width: 1440px;
  margin: auto;
}

.eyebrow {
  margin: 0 0 .8rem;
  font: 700 .72rem/1 var(--sans);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(3rem, 7vw, 6.8rem);
  font-weight: 400;
  line-height: .84;
  letter-spacing: -.045em;
}

h1 em {
  color: var(--ink);
  font-weight: 400;
  font-style: normal;
}

main { max-width: 1440px; margin: auto; }

.search-panel {
  padding: 2.5rem clamp(1.2rem, 5vw, 5.5rem) 1.6rem;
  border-bottom: 1px solid var(--line);
}

.search-label {
  display: block;
  margin-bottom: .7rem;
  font: 700 .72rem/1 var(--sans);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.search-wrap {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  padding-bottom: .7rem;
  border-bottom: 1px solid var(--ink);
}

.search-mark {
  color: var(--ink);
  font-size: 2.1rem;
  line-height: 1;
  transform: rotate(-15deg);
}

#search {
  width: 100%;
  min-width: 0;
  padding: 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  outline: 0;
  font: 400 clamp(1.8rem, 4vw, 3.7rem)/1.15 var(--serif);
}

#search::placeholder { color: #989894; opacity: 1; }
kbd {
  align-self: center;
  padding: .22rem .43rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 2px;
  font: 600 .75rem/1 var(--sans);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem 1.2rem;
  align-items: end;
  margin-top: 1.4rem;
}

.filters label { min-width: 170px; }
.filters label span {
  display: block;
  margin-bottom: .32rem;
  color: var(--muted);
  font: 700 .65rem/1 var(--sans);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.filters select {
  width: 100%;
  padding: .58rem 2rem .58rem .65rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0;
  font: 600 .82rem/1.2 var(--sans);
}

.clear-button {
  padding: .62rem .9rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  font: 700 .7rem/1 var(--sans);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.clear-button:hover, .clear-button:focus-visible { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.search-note {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.2rem;
  color: var(--muted);
  font: .76rem/1.4 var(--sans);
}
.search-note p { margin: 0; }

.index-layout {
  display: grid;
  grid-template-columns: minmax(330px, 42%) minmax(0, 1fr);
  min-height: 680px;
  border-bottom: 1px solid var(--ink);
}

.results {
  max-height: 820px;
  overflow-y: auto;
  border-right: 1px solid var(--ink);
  scrollbar-color: var(--faint) transparent;
}

.result-card {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) auto;
  gap: .8rem;
  width: 100%;
  padding: 1.15rem clamp(1.2rem, 4vw, 3.2rem);
  color: var(--ink);
  text-align: left;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
}
.result-card:hover { background: var(--paper-deep); }
.result-card[aria-selected="true"] { background: var(--selected); box-shadow: inset 3px 0 0 var(--ink); }
.result-number { padding-top: .18rem; color: var(--muted); font: 700 .69rem/1 var(--sans); letter-spacing: .08em; }
.result-name { display: block; font-size: 1.42rem; line-height: 1.05; }
.result-meta { display: block; margin-top: .4rem; color: var(--muted); font: .74rem/1.35 var(--sans); }
.result-arrow { align-self: center; color: var(--muted); font-size: 1.2rem; }

.empty-state {
  padding: 4rem 2rem;
  color: var(--muted);
  text-align: center;
}
.empty-state strong { display: block; margin-bottom: .5rem; color: var(--ink); font-size: 1.5rem; font-weight: 400; }

.detail {
  position: sticky;
  top: 0;
  align-self: start;
  min-height: 680px;
  padding: clamp(2rem, 5vw, 5.2rem);
}

.detail-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-bottom: 1.3rem;
}

.tag {
  display: inline-block;
  padding: .28rem .52rem;
  border: 1px solid var(--line);
  font: 700 .64rem/1 var(--sans);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.tag--red { color: var(--paper); background: var(--ink); border-color: var(--ink); }

.detail h2 {
  margin: 0;
  max-width: 750px;
  font-size: clamp(2.5rem, 5vw, 5.4rem);
  font-weight: 400;
  line-height: .92;
  letter-spacing: -.04em;
}

.aliases {
  margin: .9rem 0 0;
  color: var(--muted);
  font-style: italic;
}

.description {
  max-width: 760px;
  margin: 2rem 0;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.55;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.8rem 2.6rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--ink);
}

.detail-section h3 {
  margin: 0 0 .65rem;
  color: var(--ink);
  font: 700 .68rem/1 var(--sans);
  letter-spacing: .13em;
  text-transform: uppercase;
}

.plain-list, .reference-list { list-style: none; padding: 0; margin: 0; }
.plain-list li { margin: .28rem 0; line-height: 1.35; }
.reference-list { grid-column: 1 / -1; }
.reference-list li {
  display: grid;
  grid-template-columns: minmax(150px, .8fr) minmax(0, 1.4fr);
  gap: 1rem;
  padding: .65rem 0;
  border-bottom: 1px dotted var(--line);
}
.reference-list strong { font-weight: 400; }
.reference-list span { color: var(--muted); font: .82rem/1.45 var(--sans); }

.coverage {
  padding: 5rem clamp(1.2rem, 5vw, 5.5rem);
}

.section-heading {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
  margin-bottom: 2.5rem;
}
.section-heading h2 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.8rem);
  font-weight: 400;
  line-height: .95;
  letter-spacing: -.035em;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--ink);
}

.book-card {
  position: relative;
  min-height: 170px;
  padding: 1.25rem;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.book-card--indexed { background: var(--paper-deep); color: var(--ink); }
.book-status { margin: 0 0 2.5rem; color: var(--muted); font: 700 .62rem/1 var(--sans); letter-spacing: .11em; text-transform: uppercase; }
.book-card--indexed .book-status { color: var(--red-dark); }
.book-card h3 { margin: 0; font-size: 1.25rem; font-weight: 400; line-height: 1.08; }
.book-year { position: absolute; right: 1rem; bottom: .8rem; color: var(--muted); font: .72rem/1 var(--sans); }
.book-card--indexed .book-year { color: var(--muted); }

.method-note {
  display: grid;
  grid-template-columns: 160px repeat(2, minmax(0, 1fr));
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 3px solid var(--ink);
}
.method-note h3 { margin: 0; color: var(--ink); font: 700 .7rem/1.3 var(--sans); letter-spacing: .12em; text-transform: uppercase; }
.method-note p { margin: 0; color: var(--muted); line-height: 1.5; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.5rem clamp(1.2rem, 5vw, 5.5rem);
  color: var(--muted);
  background: var(--paper);
  border-top: 1px solid var(--ink);
  font: .72rem/1.4 var(--sans);
}
footer p { margin: 0; }
footer span { color: var(--ink); }

@media (max-width: 900px) {
  h1 { line-height: .84; }
  .index-layout { display: block; }
  .results { max-height: 520px; border-right: 0; border-bottom: 1px solid var(--ink); }
  .detail { position: static; min-height: 0; }
  .book-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .method-note { grid-template-columns: 1fr 1fr; }
  .method-note h3 { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .masthead { padding-top: .8rem; }
  .masthead__rule { margin-bottom: 2rem; }
  h1 { font-size: 3.2rem; }
  .search-panel { padding-top: 1.7rem; }
  #search { font-size: 1.55rem; }
  kbd { display: none; }
  .filters { display: grid; grid-template-columns: 1fr 1fr; }
  .filters label { min-width: 0; }
  .clear-button { min-height: 39px; align-self: end; }
  .search-note { display: block; }
  .search-note p + p { margin-top: .35rem; }
  .result-card { grid-template-columns: 2.2rem minmax(0, 1fr) auto; padding-inline: 1.2rem; }
  .detail { padding: 2rem 1.2rem 3rem; }
  .detail h2 { font-size: 2.7rem; }
  .detail-grid { grid-template-columns: 1fr; }
  .reference-list { grid-column: auto; }
  .reference-list li { grid-template-columns: 1fr; gap: .3rem; }
  .section-heading { grid-template-columns: 1fr; gap: .5rem; }
  .book-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .book-card { min-height: 150px; }
  .method-note { grid-template-columns: 1fr; }
  footer { display: block; }
  footer p + p { margin-top: .6rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}