.index-rail {
  display: none;
}

.index-rail__inner {
  position: sticky;
  top: 6rem;
  display: flex;
  flex-direction: column;
  gap: var(--gap-s);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  border-right: var(--line-ink);
  padding-right: 0.6rem;
}

.index-rail__item {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
  text-decoration: none;
  font-weight: 700;
}

.index-rail__item:hover {
  color: var(--ink);
}

.top-index {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.4rem;
  border-bottom: var(--line);
}

.top-index__item {
  flex: none;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--slate);
  text-decoration: none;
  padding: 0.35rem 0.55rem;
  border: var(--line);
  border-radius: var(--radius-1);
  background: var(--white);
  white-space: nowrap;
}

.hero {
  padding-block: var(--gap-xl) var(--gap-2xl);
  position: relative;
}

.hero__grid {
  display: grid;
  gap: var(--gap-l);
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.hero__title {
  font-size: var(--step-4);
}

.hero__accent {
  color: var(--cobalt);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.prism-instrument {
  border: var(--line-ink);
  background: var(--white);
  padding: var(--gap-m);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.prism-instrument__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--gap-s);
  border-bottom: var(--line);
  padding-bottom: var(--gap-xs);
  margin-bottom: var(--gap-s);
}

.prism-instrument__score {
  font-size: var(--step-3);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--cobalt);
}

.section-head {
  display: grid;
  gap: var(--gap-xs);
  max-width: 46rem;
  margin-bottom: var(--gap-l);
}

.section-head__coord {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-head__coord::after {
  content: "";
  flex: 1;
  height: 0;
  border-top: var(--line-ink);
}

.method-preview {
  display: grid;
  gap: 0;
  border: var(--line-ink);
}

.method-preview__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--gap-s);
  padding: var(--gap-s) var(--gap-m);
  border-bottom: var(--line);
}

.method-preview__step:last-child {
  border-bottom: none;
}

.method-preview__num {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--cobalt);
  font-size: var(--step-1);
}

.discovery {
  display: grid;
  gap: var(--gap-m);
  grid-template-columns: 1fr;
}

.discovery__stage {
  border: var(--line-ink);
  background: var(--mist);
  padding: var(--gap-m);
  min-height: 12rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

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

.discovery__result {
  font-size: var(--step-1);
  font-weight: 700;
}

.timeline {
  display: grid;
  gap: 0;
  border-left: var(--line-ink);
  padding-left: var(--gap-m);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--gap-m);
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--gap-m) - 6px);
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--apricot);
  border: 2px solid var(--ink);
}

.timeline__date {
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
  font-weight: 700;
}

.lanes {
  display: grid;
  gap: var(--gap-s);
}

.lane {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.4rem;
  padding: var(--gap-s) var(--gap-m);
  border: var(--line);
  background: var(--white);
}

.lane__name {
  font-weight: 700;
}

.route-map {
  counter-reset: route;
  display: grid;
  gap: var(--gap-m);
}

.route-node {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--gap-m);
  align-items: start;
}

.route-node__marker {
  position: relative;
  width: 2.6rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.route-node__dot {
  width: 2.6rem;
  height: 2.6rem;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--white);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
}

.route-node__line {
  flex: 1;
  width: 2px;
  background: var(--edge-strong);
  margin-top: 0.4rem;
}

.route-node:last-child .route-node__line {
  display: none;
}

.article-list {
  display: grid;
  gap: var(--gap-m);
  grid-template-columns: 1fr;
}

.article-card {
  display: flex;
  flex-direction: column;
  gap: var(--gap-xs);
  border: var(--line);
  background: var(--white);
  padding: var(--gap-m);
  height: 100%;
}

.article-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.72rem;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.feature-article {
  display: grid;
  gap: var(--gap-l);
  grid-template-columns: 1fr;
  border: var(--line-ink);
  background: var(--white);
  padding: var(--gap-m);
}

.quote {
  border-left: 6px solid var(--apricot);
  padding: var(--gap-s) var(--gap-m);
  background: var(--white);
  font-size: var(--step-1);
  font-style: italic;
}

.quote cite {
  display: block;
  margin-top: var(--gap-xs);
  font-style: normal;
  font-weight: 700;
  font-size: var(--step--1);
  color: var(--slate);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--step--1);
}

.matrix-table caption {
  text-align: left;
  font-weight: 700;
  margin-bottom: var(--gap-xs);
  color: var(--slate);
}

.matrix-table th,
.matrix-table td {
  border: var(--line);
  padding: 0.6rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

.matrix-table thead th {
  background: var(--ink);
  color: var(--white);
}

.matrix-table tbody tr:nth-child(even) {
  background: var(--mist);
}

.score-views {
  display: grid;
  gap: var(--gap-m);
}

.score-view[hidden] {
  display: none;
}

.pref-form {
  display: grid;
  gap: var(--gap-m);
}

.pref-group {
  border: var(--line);
  padding: var(--gap-m);
  background: var(--white);
}

.pref-group legend {
  font-weight: 700;
  padding-inline: 0.4rem;
}

.pref-options {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: 1fr;
}

.pref-option {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  border: var(--line);
  padding: 0.7rem 0.8rem;
  min-height: 44px;
  cursor: pointer;
}

.pref-option input {
  width: 20px;
  height: 20px;
}

.pref-result {
  border: var(--line-ink);
  background: var(--mist);
  padding: var(--gap-m);
}

@media (min-width: 48rem) {
  .article-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-article {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }
  .pref-options {
    grid-template-columns: repeat(2, 1fr);
  }
  .lane {
    grid-template-columns: 12rem 1fr auto;
    align-items: center;
  }
  .discovery {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

@media (min-width: 64rem) {
  .index-rail {
    display: block;
  }
  .top-index {
    display: none;
  }
  .hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
  .article-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .route-map--wide {
    grid-template-columns: repeat(2, 1fr);
  }
}