.library-intro {
  min-height: calc(100vh - var(--header-height));
  display: grid;
  grid-template-columns: minmax(22rem, 0.86fr) minmax(34rem, 1.14fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 8rem);
  padding: clamp(4rem, 10vh, 8rem) var(--page-padding);
  border-bottom: 1px solid var(--ink);
}

.library-intro__title h1,
.section-heading h2,
.directory-page h1,
.error-page h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.library-intro__title h1 {
  max-width: 11ch;
  margin-top: 0.65rem;
  font-size: clamp(3.5rem, 7vw, 6rem);
  line-height: 0.9;
}

.library-intro__title > p:last-child {
  max-width: 58ch;
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.library-control {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2rem;
}

.decision-boundary {
  display: grid;
  grid-template-columns: auto minmax(12rem, 1fr) 1px auto minmax(12rem, 1fr);
  align-items: center;
  gap: 1rem;
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--ink);
}

.decision-boundary strong,
.decision-boundary span {
  display: block;
}

.decision-boundary strong {
  font-family: var(--display);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.05;
}

.decision-boundary div:last-of-type strong {
  color: var(--stop);
}

.decision-boundary div > span {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.decision-boundary__divider {
  align-self: stretch;
  width: 1px;
  background: var(--divider);
}

.signal {
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 999px;
}

.signal--go {
  background: var(--fact);
}

.signal--stop {
  background: var(--stop);
}

.library-search {
  padding: 1.4rem;
  background: var(--ink);
  color: var(--surface);
  border: 1px solid var(--ink);
}

.library-search label {
  display: block;
  margin-bottom: 0.8rem;
  font-weight: 650;
}

.library-search__control {
  min-height: 3.6rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0 1rem;
  background: var(--surface);
  color: var(--ink);
}

.library-search__control > span {
  color: var(--rail-blue);
  font-family: var(--display);
  font-size: 1.5rem;
  font-weight: 700;
}

.library-search input {
  width: 100%;
  min-width: 0;
  min-height: 3.5rem;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 1rem;
}

.library-search input::placeholder {
  color: var(--placeholder);
  opacity: 1;
}

.library-search kbd {
  min-width: 1.8rem;
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--divider);
  background: var(--paper);
  color: var(--muted);
  font-family: var(--body);
  font-size: 0.75rem;
  text-align: center;
}

.library-search p {
  min-height: 1.25rem;
  margin: 0.7rem 0 0;
  color: #d7dce0;
  font-size: 0.78rem;
}

.featured-route,
.library-map,
.search-results {
  max-width: var(--content-width);
  margin-inline: auto;
  padding: clamp(4rem, 8vw, 7rem) var(--page-padding);
}

.featured-route,
.search-results {
  border-bottom: 1px solid var(--divider);
}

.section-heading {
  margin-bottom: 2rem;
}

.section-heading--split {
  display: grid;
  grid-template-columns: minmax(18rem, 0.8fr) minmax(18rem, 1.2fr);
  align-items: end;
  gap: 2rem;
}

.section-heading h2 {
  margin-top: 0.4rem;
  font-size: clamp(2.6rem, 5vw, 4.6rem);
  line-height: 0.95;
}

.section-heading > p,
.section-heading--split > p {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
}

.featured-lines,
.document-lines {
  border-top: 1px solid var(--ink);
}

.featured-line,
.document-line {
  min-height: 5.8rem;
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr) minmax(9rem, 0.22fr) 2rem;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0.8rem;
  border-bottom: 1px solid var(--divider);
  color: var(--ink);
  text-decoration: none;
}

.featured-line:hover,
.document-line:hover {
  background: var(--surface);
}

.featured-line__code,
.document-line__code {
  color: var(--rail-blue);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.05em;
}

.featured-line__copy,
.document-line__copy {
  min-width: 0;
}

.featured-line__copy strong,
.featured-line__copy span,
.document-line__copy strong,
.document-line__copy span {
  display: block;
}

.featured-line__copy strong,
.document-line__copy strong {
  font-size: 1rem;
  line-height: 1.35;
}

.featured-line__copy span,
.document-line__copy span {
  max-width: 72ch;
  margin-top: 0.22rem;
  overflow: hidden;
  color: var(--muted);
  font-size: 0.82rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.featured-line__route,
.document-line__route {
  color: var(--muted);
  font-size: 0.75rem;
}

.featured-line__arrow,
.document-line__arrow {
  color: var(--rail-blue);
  font-family: var(--display);
  font-size: 1.5rem;
  font-weight: 700;
}

.search-empty {
  margin: 0;
  padding: 2rem 0.8rem;
  border-bottom: 1px solid var(--divider);
  color: var(--muted);
}

.library-groups {
  display: grid;
  gap: 3.5rem;
}

.library-group {
  border-top: 2px solid var(--ink);
}

.library-group__header {
  display: grid;
  grid-template-columns: minmax(12rem, 0.45fr) minmax(18rem, 1fr) auto;
  align-items: start;
  gap: 2rem;
  padding: 1.2rem 0.8rem;
  border-bottom: 1px solid var(--divider);
}

.library-group__header h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.8rem;
  line-height: 1;
}

.library-group__header p {
  max-width: 64ch;
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.library-group__header span {
  color: var(--rail-blue);
  font-size: 0.75rem;
  font-weight: 750;
}

.library-group__documents {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.library-group__documents a {
  min-height: 4.6rem;
  display: grid;
  grid-template-columns: 3.8rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem;
  border-bottom: 1px solid var(--divider);
  color: var(--ink);
  text-decoration: none;
}

.library-group__documents a:nth-child(odd) {
  border-inline-end: 1px solid var(--divider);
}

.library-group__documents a:hover {
  background: var(--surface);
}

.library-group__documents small {
  color: var(--rail-blue);
  font-size: 0.68rem;
  font-weight: 750;
}

.library-group__documents strong {
  overflow: hidden;
  font-size: 0.86rem;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.library-group__documents i {
  color: var(--muted);
  font-family: var(--display);
  font-size: 1.2rem;
  font-style: normal;
}

.directory-page {
  width: min(100%, 72rem);
  min-height: calc(100vh - var(--header-height));
  margin-inline: auto;
  padding: 2rem var(--page-padding) 7rem;
}

.directory-page h1 {
  max-width: 16ch;
  margin: 0.7rem 0 1.2rem;
  font-size: clamp(3rem, 7vw, 5.6rem);
  line-height: 0.9;
  overflow-wrap: anywhere;
}

.directory-page__intro {
  max-width: 65ch;
  margin: 0 0 3rem;
  color: var(--muted);
}

.directory-list {
  border-top: 2px solid var(--ink);
}

.directory-entry {
  min-height: 4.5rem;
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr) auto 2rem;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem;
  border-bottom: 1px solid var(--divider);
  color: var(--ink);
  text-decoration: none;
}

.directory-entry:hover {
  background: var(--surface);
}

.directory-entry__type {
  color: var(--rail-blue);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.05em;
}

.directory-entry__name {
  min-width: 0;
  overflow-wrap: anywhere;
  font-size: 0.86rem;
  font-weight: 650;
}

.directory-entry__size {
  color: var(--muted);
  font-size: 0.72rem;
}

.directory-entry__arrow {
  color: var(--rail-blue);
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 700;
}

.error-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.error-page main {
  max-width: 45rem;
  padding: clamp(2rem, 7vw, 5rem);
  background: var(--surface);
  border: 1px solid var(--ink);
}

.error-page h1 {
  max-width: 12ch;
  margin: 0.7rem 0 1rem;
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 0.92;
}

.error-page p {
  max-width: 58ch;
}

.primary-action {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  margin-top: 1rem;
  padding: 0.7rem 1rem;
  background: var(--rail-blue);
  color: var(--surface);
  font-weight: 700;
  text-decoration: none;
}

.primary-action:hover {
  background: var(--ink);
}

@media (max-width: 58rem) {
  .library-intro {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .library-control {
    align-self: auto;
  }

  .section-heading--split {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .library-group__documents {
    grid-template-columns: 1fr;
  }

  .library-group__documents a:nth-child(odd) {
    border-inline-end: 0;
  }
}

@media (max-width: 42rem) {
  .library-intro {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }

  .library-intro__title h1 {
    max-width: 9ch;
    font-size: clamp(3.2rem, 16vw, 4.4rem);
  }

  .decision-boundary {
    grid-template-columns: auto 1fr;
  }

  .decision-boundary__divider {
    grid-column: 1 / -1;
    width: 100%;
    height: 1px;
  }

  .library-search {
    padding: 1rem;
  }

  .library-search kbd {
    display: none;
  }

  .library-search__control {
    grid-template-columns: auto 1fr;
  }

  .featured-line,
  .document-line {
    grid-template-columns: 3.8rem minmax(0, 1fr) auto;
  }

  .featured-line__route,
  .document-line__route {
    display: none;
  }

  .featured-line__copy span,
  .document-line__copy span {
    white-space: normal;
  }

  .library-group__header {
    grid-template-columns: 1fr auto;
    gap: 0.8rem;
  }

  .library-group__header p {
    grid-column: 1 / -1;
  }
}