.knowledge-index {
  min-width: 0;
}

.knowledge-index__hero .single-content__title {
  max-width: min(100%, 22ch);
}

.knowledge-index__layout {
  display: grid;
  gap: var(--space-4);
}

.knowledge-index__controls {
  border-bottom: 1px solid var(--clr-border);
  display: grid;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
}

.knowledge-index__controls h2,
.knowledge-index__letter-section h2,
.knowledge-index__formal h2,
.knowledge-index__sitemap h2 {
  font-size: clamp(1.35rem, 1vw + 1rem, 1.8rem);
}

.knowledge-index__search {
  max-width: 46rem;
}

.knowledge-index__search label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.knowledge-index__search-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  min-width: 0;
}

.knowledge-index__search input[type="search"] {
  background-color: var(--clr-form-bg);
  border: 1px solid var(--clr-form-border);
  border-radius: var(--radius);
  color: var(--clr-form-text);
  color-scheme: dark;
  flex: 1 1 18rem;
  font: inherit;
  min-height: 2.8rem;
  min-width: 0;
  padding: 0.65rem 0.75rem;
}
.knowledge-index__search input[type="search"]::placeholder {
  color: var(--clr-form-muted);
  opacity: 1;
}
.knowledge-index__search input[type="search"]:hover:not(:disabled):not([readonly]) {
  background-color: var(--clr-form-bg-hover);
  border-color: var(--clr-form-border-hover);
}
.knowledge-index__search input[type="search"]:focus,
.knowledge-index__search input[type="search"]:focus-visible {
  background-color: var(--clr-form-bg-hover);
  border-color: var(--clr-form-focus);
  box-shadow: 0 0 0 3px rgba(255, 207, 112, 0.25);
  outline: 3px solid var(--clr-form-focus);
  outline-offset: 2px;
}
.knowledge-index__search input[type="search"]:disabled,
.knowledge-index__search input[type="search"][readonly] {
  background-color: var(--clr-form-bg-disabled);
  border-color: #6f879e;
  color: var(--clr-form-muted);
  opacity: 1;
}

.knowledge-index__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.knowledge-index__filter {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border-strong);
  border-radius: var(--radius);
  color: var(--clr-text);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  min-height: 2.6rem;
  max-width: 100%;
  padding: 0.55rem 0.8rem;
  white-space: normal;
  overflow-wrap: anywhere;
}

.knowledge-index__filter:hover,
.knowledge-index__filter.is-active,
.knowledge-index__filter[aria-current="true"] {
  background: var(--clr-accent);
  border-color: var(--clr-accent);
  color: var(--clr-on-accent);
}

.knowledge-index__status {
  color: var(--clr-text-muted);
  font-weight: 700;
  margin: 0;
}

.knowledge-index__az ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.knowledge-index__az a,
.knowledge-index__az span {
  align-items: center;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  display: inline-flex;
  font-weight: 700;
  justify-content: center;
  min-height: 2.5rem;
  min-width: 2.5rem;
  padding: 0.35rem 0.6rem;
  text-decoration: none;
}

.knowledge-index__az a {
  background: var(--clr-bg);
}

.knowledge-index__az a:hover {
  background: var(--clr-bg-alt);
  border-color: var(--clr-border-strong);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.knowledge-index__az span[aria-disabled="true"] {
  color: var(--clr-text-muted);
  opacity: 0.68;
}

.knowledge-index__results {
  display: grid;
  gap: var(--space-4);
}

.knowledge-index__letter-section {
  scroll-margin-top: 7rem;
}

.knowledge-index__letter-section > h2 {
  border-bottom: 2px solid var(--clr-accent);
  color: var(--clr-accent);
  margin-bottom: var(--space-3);
  padding-bottom: 0.4rem;
}

.knowledge-index__term + .knowledge-index__term {
  margin-top: var(--space-3);
}

.knowledge-index__term h3 {
  font-size: clamp(1.15rem, 0.5vw + 1rem, 1.35rem);
  margin-bottom: var(--space-1);
  overflow-wrap: anywhere;
}

.knowledge-index__list,
.knowledge-index__formal ul {
  display: grid;
  gap: 0.9rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.knowledge-index__item {
  border-left: 3px solid var(--clr-border);
  min-width: 0;
  padding-left: var(--space-2);
}

.knowledge-index__item-title {
  color: var(--clr-text);
  font-weight: 800;
  overflow-wrap: anywhere;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.knowledge-index__meta {
  color: var(--clr-text-muted);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.92rem;
  gap: 0.25rem 0.8rem;
  margin: 0.2rem 0 0;
}

.knowledge-index__meta span + span::before {
  content: "/";
  margin-right: 0.8rem;
}

.knowledge-index__excerpt {
  color: var(--clr-text-muted);
  font-size: 0.96rem;
  margin: 0.35rem 0 0;
  max-width: 72ch;
  overflow-wrap: anywhere;
}

.knowledge-index__empty,
.knowledge-index__formal,
.knowledge-index__sitemap {
  background: var(--clr-bg-alt);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  overflow-wrap: anywhere;
}

.knowledge-index__empty p,
.knowledge-index__sitemap p {
  color: var(--clr-text-muted);
}

.knowledge-index :is(a, button, input):focus-visible {
  outline: 3px solid var(--clr-focus);
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .knowledge-index__search-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .knowledge-index__search input[type="search"],
  .knowledge-index__search-row .btn {
    width: 100%;
  }

  .knowledge-index__filter {
    flex: 1 1 auto;
  }

  .knowledge-index__meta {
    display: grid;
    gap: 0.1rem;
  }

  .knowledge-index__meta span + span::before {
    content: "";
    margin: 0;
  }

  .knowledge-index__empty,
  .knowledge-index__formal,
  .knowledge-index__sitemap {
    padding: var(--space-2);
  }
}