.page-about {
  --about-rail-w: 168px;
  --about-rail-gap: clamp(28px, 4vw, 64px);
}

/* ---------- hero ---------- */

.page-about .breadcrumb {
  margin: 0 0 clamp(18px, 3vw, 30px);
}

.page-about .about-hero {
  position: relative;
  border-top: var(--line);
  border-bottom: var(--line);
  padding: clamp(30px, 5.5vw, 60px) 0 clamp(26px, 4.5vw, 48px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--c-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--c-grid) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.38;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(205deg, #000 0%, transparent 70%);
  mask-image: linear-gradient(205deg, #000 0%, transparent 70%);
}

.page-about .about-hero > * {
  position: relative;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(12px, 2vw, 18px);
  color: var(--c-cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: clamp(32px, 7.4vw, 64px);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--c-white);
  max-width: 20ch;
}

.page-about .about-hero__title span {
  display: block;
  font-size: 0.72em;
  color: var(--c-muted);
  line-height: 1.34;
}

@media (min-width: 700px) {
  .page-about .about-hero__title span {
    padding-left: 1em;
  }
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--c-grid);
  border: var(--line);
}

.page-about .about-hero__stat {
  background-color: var(--c-deep);
  padding: clamp(14px, 2.2vw, 20px) clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-hero__stat-value {
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__unit {
  font-size: 0.5em;
  color: var(--c-cyan);
  margin-left: 2px;
  letter-spacing: 0.02em;
}

.page-about .about-hero__stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- deck ---------- */

.page-about .about-deck {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 40px);
  margin-top: clamp(30px, 5vw, 56px);
}

@media (min-width: 960px) {
  .page-about .about-deck {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
  }
}

/* ---------- rail ---------- */

.page-about .about-rail {
  border-top: 2px solid var(--c-cyan);
  padding-top: 14px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  color: var(--c-muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: none;
}

.page-about .about-rail__link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 13px;
  border: 1px solid var(--c-grid);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--c-cyan);
  background-color: rgba(111, 242, 224, 0.07);
}

.page-about .about-rail__year {
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--c-white);
  font-variant-numeric: tabular-nums;
  transition: color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover .about-rail__year,
.page-about .about-rail__link:focus-visible .about-rail__year {
  color: var(--c-cyan);
}

.page-about .about-rail__tag {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
  white-space: nowrap;
}

@media (min-width: 960px) {
  .page-about .about-rail {
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__item + .about-rail__item {
    margin-top: 4px;
  }

  .page-about .about-rail__link {
    padding: 10px 12px 10px 16px;
    border: 1px solid transparent;
    border-left: 2px solid var(--c-grid);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-color: transparent;
    border-left-color: var(--c-cyan);
    background-color: rgba(111, 242, 224, 0.05);
  }
}

/* ---------- chapters ---------- */

.page-about .about-chapter {
  border-top: var(--line);
  padding-top: clamp(22px, 3.2vw, 34px);
  margin-top: clamp(30px, 4.5vw, 52px);
  scroll-margin-top: 28px;
}

.page-about .about-body > .about-chapter:first-child {
  margin-top: 0;
  padding-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 1.6vw, 16px);
  margin-bottom: clamp(14px, 2.2vw, 22px);
}

.page-about .about-chapter__num {
  flex: none;
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .about-chapter__body {
  max-width: 66ch;
}

.page-about .about-chapter__body p {
  margin: 0 0 1em;
  color: var(--c-muted);
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__body strong {
  color: var(--c-white);
  font-weight: 500;
}

.page-about .about-chapter__body--after {
  margin-top: clamp(16px, 2.4vw, 24px);
}

.page-about .about-chapter__tail {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-inline-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(111, 242, 224, 0.4);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--c-cyan);
}

/* ---------- split ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-split__media {
  margin: 0;
}

.page-about .about-split__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

@media (min-width: 800px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-split--flip .about-split__media {
    order: -1;
  }
}

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

.page-about .about-timeline-scroll {
  margin: clamp(20px, 3vw, 30px) 0 0;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .about-timeline {
  display: block;
  width: 100%;
  min-width: 640px;
  height: auto;
}

.page-about .about-timeline .tl-axis {
  stroke: var(--c-grid);
  stroke-width: 1;
}

.page-about .about-timeline .tl-node rect {
  fill: var(--c-deep);
  stroke: var(--c-steel);
  stroke-width: 1.5;
  transition: stroke var(--dur) var(--ease), fill var(--dur) var(--ease);
}

.page-about .about-timeline .tl-node:hover rect,
.page-about .about-timeline .tl-node:focus rect,
.page-about .about-timeline .tl-node:focus-visible rect {
  stroke: var(--c-cyan);
  fill: var(--c-panel);
}

.page-about .about-timeline .tl-node:focus {
  outline: none;
}

.page-about .about-timeline .tl-year {
  font-family: var(--f-mono);
  font-size: 15px;
  letter-spacing: 0.05em;
  fill: var(--c-white);
}

.page-about .about-timeline .tl-label {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  fill: var(--c-muted);
}

.page-about .about-timeline .tl-node:hover .tl-label {
  fill: var(--c-cyan);
}

/* ---------- column list ---------- */

.page-about .about-columns {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--c-grid);
  border: var(--line);
}

.page-about .about-columns__item {
  background-color: var(--c-deep);
  padding: clamp(14px, 2vw, 18px) clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-columns__item:hover {
  background-color: var(--c-panel);
}

.page-about .about-columns__name {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .about-columns__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--c-muted);
}

@media (min-width: 640px) {
  .page-about .about-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.page-about .about-media-wide {
  margin: clamp(20px, 3vw, 30px) 0 0;
  position: relative;
  border: var(--line);
}

.page-about .about-media-wide .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-media-wide .media-frame__caption {
  display: block;
  padding: 10px 14px;
  border-top: var(--line);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

/* ---------- contact ---------- */

.page-about .about-contact {
  margin: clamp(20px, 3vw, 30px) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: var(--c-grid);
  border: var(--line);
}

.page-about .about-contact__item {
  background-color: var(--c-deep);
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-contact__label {
  color: var(--c-muted);
}

.page-about .about-contact__value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-white);
  word-break: break-word;
}

.page-about .about-contact .copy-btn {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  padding: 0;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.page-about .about-contact .copy-btn:hover .about-contact__value,
.page-about .about-contact .copy-btn:focus-visible .about-contact__value {
  color: var(--c-cyan);
}

.page-about .about-contact .copy-btn:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 4px;
}

.page-about .about-contact .copy-btn__state {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
  border: 1px solid var(--c-grid);
  padding: 2px 7px;
  white-space: nowrap;
}

@media (min-width: 760px) {
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-contact__item--wide {
    grid-column: 1 / -1;
  }
}

/* ---------- cta ---------- */

.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 56px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 2px solid var(--c-cyan);
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 20px);
  align-items: flex-start;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.5;
  color: var(--c-white);
}

@media (min-width: 860px) {
  .page-about .about-cta {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-cta .btn-row {
    flex: none;
  }
}