.page-about {
  --about-num: rgba(138, 148, 166, .34);
  --about-fade: rgba(255, 255, 255, .015);
  background: var(--carbon);
  color: var(--white);
  font-family: var(--sans);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: clamp(16px, 3vw, 26px) 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--grey);
}

.page-about .breadcrumb a {
  color: var(--grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--ink-soft);
}

/* ---- cover ---- */

.page-about .cover {
  max-width: 1040px;
  padding: clamp(34px, 6vw, 84px) 0 clamp(30px, 5vw, 60px);
}

.page-about .cover .eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--green);
  text-transform: uppercase;
}

.page-about .cover h1 {
  margin: 18px 0 0;
  font-size: clamp(30px, 6vw, 62px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -.02em;
  max-width: 17em;
}

.page-about .cover .lede {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .cover-index {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.page-about .cover-index a {
  display: inline-flex;
  gap: 9px;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--grey);
  text-decoration: none;
  transition: color .18s var(--ease);
}

.page-about .cover-index a span {
  color: var(--blue);
}

.page-about .cover-index a:hover,
.page-about .cover-index a:focus-visible {
  color: var(--white);
}

.page-about .cover-index a:hover span,
.page-about .cover-index a:focus-visible span {
  color: var(--green);
}

/* ---- chapter shell ---- */

.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 30px);
  padding: clamp(40px, 7vw, 88px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 120px;
}

.page-about .chapter-num {
  display: block;
  font-family: var(--mono);
  font-weight: 200;
  font-size: clamp(46px, 13vw, 92px);
  line-height: .86;
  letter-spacing: -.05em;
  color: var(--about-num);
}

.page-about .chapter-title {
  margin: 14px 0 0;
  font-size: clamp(19px, 2.4vw, 25px);
  line-height: 1.42;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .chapter-body > * + * {
  margin-top: clamp(18px, 2.4vw, 26px);
}

.page-about .prose {
  max-width: 38em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .prose a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 198, 255, .35);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .prose a:hover,
.page-about .prose a:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

/* ---- relation map ---- */

.page-about .rel-map {
  margin: 0;
  padding: clamp(14px, 3vw, 26px);
  border: 1px solid var(--line);
  background: var(--carbon-2);
}

.page-about .rel-map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .rel-map .rm-box {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .rel-map .rm-box--entry {
  stroke: rgba(45, 107, 255, .55);
}

.page-about .rel-map .rm-link {
  fill: none;
  stroke: rgba(138, 148, 166, .32);
  stroke-width: 1;
}

.page-about .rel-map .rm-link--live {
  stroke: rgba(23, 226, 127, .55);
}

.page-about .rel-map .rm-text {
  fill: var(--ink-soft);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .02em;
}

.page-about .rel-map .rm-text--entry {
  fill: var(--white);
}

.page-about .rel-cap {
  margin: 16px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---- season strip ---- */

.page-about .season-strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .season-strip li {
  background: var(--carbon-2);
  padding: 15px 6px;
  text-align: center;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--grey);
}

.page-about .season-strip li.is-current {
  background: rgba(23, 226, 127, .07);
  color: var(--green);
}

/* ---- family list ---- */

.page-about .family-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .family-list li {
  display: grid;
  gap: 5px;
  padding: 15px 0 15px 14px;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .family-list li:hover {
  border-left-color: var(--blue);
  background: var(--about-fade);
}

.page-about .fam-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .fam-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---- media ---- */

.page-about .media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--carbon-2);
}

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---- caliber spec ---- */

.page-about .spec {
  border-top: 1px solid var(--line);
}

.page-about .spec-row {
  display: grid;
  gap: 6px;
  padding: 16px 12px;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .spec-row:nth-child(even) {
  background: var(--about-fade);
}

.page-about .spec-row:hover {
  border-left-color: var(--green);
  background: rgba(45, 107, 255, .07);
}

.page-about .spec-field {
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--white);
}

.page-about .spec-detail {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .spec-when {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--green);
}

/* ---- timeline ---- */

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--blue), rgba(23, 226, 127, .6));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 28px;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 15px;
  height: 15px;
  box-sizing: border-box;
  border: 1px solid var(--line);
  background: var(--carbon);
}

.page-about .tl-item.is-current::before {
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(23, 226, 127, .14);
}

.page-about .tl-ver {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--white);
}

.page-about .tl-item.is-current .tl-ver {
  color: var(--green);
}

.page-about .tl-season {
  margin-left: 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--grey);
}

.page-about .tl-desc {
  margin: 6px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---- next links ---- */

.page-about .next-links {
  padding-top: clamp(34px, 5vw, 60px);
  border-top: 1px solid var(--line);
}

.page-about .next-title {
  margin: 0 0 20px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .link-list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 16px 18px;
  background: var(--carbon-2);
  color: var(--white);
  text-decoration: none;
  font-size: 15px;
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.page-about .link-list a span {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--grey);
  white-space: nowrap;
}

.page-about .link-list a:hover,
.page-about .link-list a:focus-visible {
  background: #1B2230;
  color: var(--green);
}

/* ---- responsive ---- */

@media (min-width: 720px) {
  .page-about .season-strip {
    grid-template-columns: repeat(8, 1fr);
  }

  .page-about .spec-row {
    grid-template-columns: 128px minmax(0, 1fr) 148px;
    align-items: baseline;
    gap: 24px;
    padding: 17px 14px;
  }

  .page-about .spec-when {
    text-align: right;
  }

  .page-about .link-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .chapter {
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .chapter-head {
    position: sticky;
    top: 112px;
    align-self: start;
  }
}

@media (min-width: 900px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .chapter {
    grid-template-columns: 240px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}