.page-topics-index {
  color: var(--color-ink);
}

.page-topics-index .ti-crumbs {
  padding-top: var(--space-4);
}

.page-topics-index .ti-band {
  padding-block: var(--section-y);
  border-top: var(--border-thin) dashed var(--color-line);
}

.page-topics-index .ti-band--hero {
  border-top: 0;
  padding-block: var(--space-6) var(--section-y-lg);
}

.page-topics-index .ti-hero-grid {
  display: grid;
  gap: var(--space-6);
}

.page-topics-index h1 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
}

.page-topics-index h2 {
  margin: 0;
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
}

.page-topics-index h3 {
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  font-weight: var(--weight-heading);
}

.page-topics-index .ti-hero-copy .lede {
  margin-top: var(--space-3);
}

.page-topics-index .ti-hero-note {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-topics-index .ti-hero-note a {
  color: var(--color-primary);
  font-weight: var(--weight-heading);
}

.page-topics-index .ti-hero-figure,
.page-topics-index .ti-caliber-figure,
.page-topics-index .ti-neighbor-figure {
  margin: 0;
}

.page-topics-index .ti-hero-figure img,
.page-topics-index .ti-caliber-figure img,
.page-topics-index .ti-neighbor-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-topics-index .ti-hero-figure img {
  aspect-ratio: 10 / 7;
}

.page-topics-index .ti-caliber-figure {
  margin-top: var(--space-6);
}

.page-topics-index .ti-caliber-figure img {
  aspect-ratio: 14 / 5;
}

.page-topics-index .ti-neighbor-figure img {
  aspect-ratio: 1 / 1;
}

.page-topics-index .ti-conditions {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-topics-index .ti-conditions li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-3);
  background: var(--color-surface-alt);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-topics-index .ti-conditions li strong {
  color: var(--color-ink);
  font-weight: var(--weight-heading);
}

.page-topics-index .ti-conditions .circle-numeral {
  font-size: var(--text-xs);
}

.page-topics-index .ti-field-groups {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-8);
}

.page-topics-index .ti-group-title {
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-ink);
}

.page-topics-index .ti-field-list {
  margin: 0;
  display: grid;
}

.page-topics-index .ti-field {
  display: grid;
  gap: var(--space-2);
  padding-block: var(--space-4);
  border-bottom: var(--border-thin) dashed var(--color-line);
}

.page-topics-index .ti-field-name {
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-topics-index .ti-field-num {
  font-size: var(--text-xs);
}

.page-topics-index .ti-field-desc {
  margin: 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-topics-index .ti-field-desc > p {
  margin: 0;
  max-width: var(--measure);
}

.page-topics-index .ti-sample {
  margin-top: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-alt);
  font-size: var(--text-sm);
}

.page-topics-index .ti-sample summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-topics-index .ti-sample summary:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
}

.page-topics-index .ti-sample p {
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-topics-index .ti-caliber-list {
  margin: var(--space-6) 0 0;
  display: grid;
  gap: var(--space-4);
}

.page-topics-index .ti-caliber-item {
  padding-left: var(--space-4);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-topics-index .ti-caliber-item dt {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-topics-index .ti-caliber-item dd {
  margin: var(--space-1) 0 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
  max-width: var(--measure);
}

.page-topics-index .ti-table-wrap {
  margin-top: var(--space-6);
}

.page-topics-index .ti-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.page-topics-index .ti-table th {
  padding: 0 var(--space-3) var(--space-2) 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink-muted);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.page-topics-index .ti-table td {
  padding: var(--space-3) var(--space-3) var(--space-3) 0;
  vertical-align: top;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) dashed var(--color-line);
}

.page-topics-index .ti-table td:first-child {
  color: var(--color-ink);
  font-weight: var(--weight-heading);
}

.page-topics-index .ti-table td a {
  color: var(--color-primary);
}

.page-topics-index .ti-band--neighbors {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: 0;
}

.page-topics-index .ti-neighbor-grid {
  display: grid;
  gap: var(--space-6);
}

.page-topics-index .ti-neighbor-list {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-topics-index .ti-neighbor {
  display: block;
  padding: var(--space-4) var(--space-6) var(--space-4) var(--space-4);
  text-decoration: none;
  color: var(--color-contrast-ink);
  background: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.page-topics-index .ti-neighbor:hover,
.page-topics-index .ti-neighbor:focus-visible {
  transform: translateX(var(--space-1));
  background: color-mix(in srgb, var(--color-contrast-accent) 16%, transparent);
  border-color: var(--color-contrast-accent);
}

.page-topics-index .ti-neighbor:focus-visible {
  outline: var(--border-thin) solid var(--color-contrast-accent);
}

.page-topics-index .ti-neighbor-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-accent);
}

.page-topics-index .ti-neighbor-name {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-topics-index .ti-neighbor-desc {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.84;
}

.page-topics-index .ti-neighbor-figure .figure-caption {
  color: var(--color-contrast-ink);
  opacity: 0.7;
}

.page-topics-index .ti-return {
  display: grid;
  gap: var(--space-4);
  align-items: center;
}

.page-topics-index .ti-return .prose {
  margin: var(--space-2) 0 0;
  color: var(--color-ink-soft);
}

@media (min-width: 720px) {
  .page-topics-index .ti-conditions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-topics-index .ti-caliber-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-topics-index .ti-return {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 860px) {
  .page-topics-index h1 {
    font-size: var(--text-4xl);
  }

  .page-topics-index h2 {
    font-size: var(--text-2xl);
  }

  .page-topics-index .ti-hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
    gap: var(--space-8);
  }

  .page-topics-index .ti-field {
    grid-template-columns: minmax(200px, 0.34fr) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
  }

  .page-topics-index .ti-neighbor-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    gap: var(--space-8);
    align-items: start;
  }
}

@media (max-width: 719px) {
  .page-topics-index .ti-table thead {
    display: none;
  }

  .page-topics-index .ti-table tr {
    display: block;
    padding-block: var(--space-3);
    border-bottom: var(--border-thin) dashed var(--color-line);
  }

  .page-topics-index .ti-table td {
    display: block;
    padding: 0 0 var(--space-2);
    border-bottom: 0;
  }

  .page-topics-index .ti-table td:last-child {
    padding-bottom: 0;
  }

  .page-topics-index .ti-table td::before {
    content: attr(data-th);
    display: block;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.06em;
    color: var(--color-ink-muted);
    margin-bottom: var(--space-1);
  }

  .page-topics-index .ti-neighbor {
    padding: var(--space-3) var(--space-6) var(--space-3) var(--space-3);
  }
}