.page-about {
  --about-surface: rgba(16, 30, 51, 0.92);
  --about-surface-deep: rgba(12, 24, 40, 0.94);
  --about-line-soft: rgba(30, 58, 85, 0.72);
  --about-cyan-soft: rgba(51, 225, 203, 0.14);
  --about-violet-soft: rgba(138, 107, 255, 0.14);
  --about-gold-soft: rgba(240, 180, 94, 0.12);
  position: relative;
  color: var(--mist);
  overflow-x: clip;
  padding-bottom: clamp(48px, 8vw, 96px);
  background:
    radial-gradient(60% 40% at 88% 0%, rgba(138, 107, 255, 0.14), transparent 70%),
    radial-gradient(52% 36% at 4% 26%, rgba(51, 225, 203, 0.08), transparent 70%);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-crumbs {
  padding-top: clamp(18px, 3vw, 32px);
}

.page-about .about-crumbs .crumbs {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-crumbs a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .about-hero {
  display: grid;
  gap: 28px;
  padding-top: clamp(20px, 4vw, 42px);
}

.page-about .about-hero__main h1 {
  max-width: 15ch;
  margin: 0.35em 0 0.5em;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.4vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-hero__main .lede {
  max-width: 42em;
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-coord-card {
  position: relative;
  overflow: hidden;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm) var(--r-sm) var(--r-lg) var(--r-sm);
  background:
    radial-gradient(90% 80% at 100% 0%, rgba(51, 225, 203, 0.1), transparent 62%),
    linear-gradient(160deg, rgba(16, 30, 51, 0.96), rgba(12, 24, 40, 0.9));
}

.page-about .about-coord-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(to right, rgba(30, 58, 85, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 85, 0.45) 1px, transparent 1px);
  background-size: 38px 38px;
  -webkit-mask-image: linear-gradient(150deg, #000, transparent 70%);
  mask-image: linear-gradient(150deg, #000, transparent 70%);
}

.page-about .about-coord-card__label {
  position: relative;
  margin: 0 0 18px;
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-facts {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  display: grid;
  gap: 4px;
  padding: 15px 14px;
  background: rgba(10, 19, 34, 0.78);
}

.page-about .about-fact__num {
  font-family: var(--font-num);
  font-size: clamp(1.55rem, 2.4vw, 2rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-fact__label {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-coord-card__note {
  position: relative;
  margin: 16px 0 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-shell {
  display: grid;
  gap: 24px;
  margin-top: clamp(36px, 6vw, 68px);
}

.page-about .about-index {
  position: sticky;
  top: calc(var(--header-h) + 8px);
  z-index: 3;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 19, 34, 0.94);
}

.page-about .about-index__title {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

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

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible,
.page-about .about-index__list a[aria-current="true"],
.page-about .about-index__list a[aria-current="location"],
.page-about .about-index__list a[aria-current="page"] {
  color: var(--cyan);
  border-color: rgba(51, 225, 203, 0.42);
  background: var(--about-cyan-soft);
}

.page-about .about-index__num {
  font-family: var(--font-num);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-flow {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 5vw, 56px);
  min-width: 0;
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  inset: 36px 4% 36px 0;
  z-index: 0;
  pointer-events: none;
  display: none;
  background: linear-gradient(
    to bottom right,
    transparent 49.82%,
    rgba(51, 225, 203, 0.2) 49.82%,
    rgba(51, 225, 203, 0.2) 50.18%,
    transparent 50.18%
  );
}

.page-about .about-panel {
  position: relative;
  z-index: 1;
  min-width: 0;
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding: clamp(22px, 4vw, 44px);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r-sm) var(--r-sm) var(--r-lg) var(--r-sm);
  background: linear-gradient(150deg, var(--about-surface), var(--about-surface-deep));
  overflow: visible;
}

.page-about .about-panel:nth-child(even) {
  border-radius: var(--r-sm) var(--r-lg) var(--r-sm) var(--r-sm);
  background:
    radial-gradient(70% 60% at 100% 0%, var(--about-violet-soft), transparent 66%),
    linear-gradient(150deg, rgba(16, 30, 51, 0.94), rgba(10, 19, 34, 0.96));
}

.page-about .about-panel:nth-child(3n) {
  border-radius: var(--r-lg) var(--r-sm) var(--r-sm) var(--r-sm);
}

.page-about .about-panel__mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-panel__num {
  color: var(--cyan);
}

.page-about .about-panel__place {
  color: var(--violet-soft);
}

.page-about .about-panel h2 {
  margin: 0 0 0.75em;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-panel p {
  margin: 0 0 1.1em;
  color: var(--muted);
  line-height: 1.85;
  overflow-wrap: anywhere;
}

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

.page-about .about-panel__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  min-width: 0;
}

.page-about .about-panel__text {
  min-width: 0;
  max-width: 640px;
}

.page-about .about-margin-note {
  display: none;
}

.page-about .about-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-sm) var(--r-sm) var(--r-lg) var(--r-sm);
  background: linear-gradient(140deg, rgba(51, 225, 203, 0.12), rgba(138, 107, 255, 0.16));
}

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

.page-about .about-media--wide img {
  aspect-ratio: 16 / 10;
}

.page-about .about-media--square img {
  aspect-ratio: 1 / 1;
}

.page-about .about-media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
  background: rgba(10, 19, 34, 0.82);
}

.page-about .about-timeline {
  display: grid;
  gap: 6px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline li {
  position: relative;
}

.page-about .about-timeline details {
  position: relative;
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline details::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 16px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--ink);
  transition: background 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-timeline details[open]::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(51, 225, 203, 0.12);
}

.page-about .about-timeline summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  cursor: pointer;
  font-weight: 600;
  color: var(--mist);
  list-style: none;
}

.page-about .about-timeline summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .about-timeline__year {
  min-width: 3.4em;
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-timeline__hint {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-timeline details[open] .about-timeline__hint {
  color: var(--cyan);
}

.page-about .about-timeline details p {
  margin: 0 0 12px;
  padding-right: 4px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.8;
}

.page-about .about-map {
  margin-top: 22px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm) var(--r-sm) var(--r-lg) var(--r-sm);
  background:
    radial-gradient(80% 80% at 100% 0%, rgba(138, 107, 255, 0.12), transparent 65%),
    rgba(10, 19, 34, 0.5);
}

.page-about .about-map__canvas {
  color: var(--mist);
}

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

.page-about .about-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 14px 0 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  color: var(--muted);
  font-size: 0.8rem;
}

.page-about .about-legend li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .about-spec {
  width: 100%;
  margin-top: 22px;
  border-collapse: collapse;
}

.page-about .about-spec th {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-align: left;
}

.page-about .about-spec td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--about-line-soft);
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.7;
  vertical-align: top;
}

.page-about .about-spec td:first-child {
  color: var(--mist);
  font-weight: 600;
}

.page-about .about-spec__name {
  display: flex;
  align-items: center;
  gap: 9px;
}

.page-about .about-spec__name svg {
  flex: none;
  color: var(--cyan);
}

.page-about .about-inline-link {
  margin-top: 18px !important;
  font-size: 0.9rem;
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration-color: rgba(51, 225, 203, 0.45);
  text-underline-offset: 3px;
}

.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  color: var(--gold-bright);
}

.page-about .about-tiers {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-tier {
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: rgba(10, 19, 34, 0.55);
  transition: opacity 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-tier--1 {
  border-radius: 10px;
}

.page-about .about-tier--2 {
  margin-left: 10px;
  border-color: rgba(138, 107, 255, 0.42);
  border-radius: 18px;
}

.page-about .about-tier--3 {
  margin-left: 20px;
  border-color: rgba(51, 225, 203, 0.46);
  border-radius: 28px;
  background:
    linear-gradient(120deg, rgba(51, 225, 203, 0.08), rgba(138, 107, 255, 0.12)),
    rgba(10, 19, 34, 0.58);
}

.page-about .about-tier__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-tier h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-tier__code {
  font-family: var(--font-num);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-tier ul {
  margin: 10px 0 0;
  padding-left: 1.1em;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.8;
}

.page-about .about-tier li::marker {
  color: var(--cyan);
}

.page-about .about-tiers:hover .about-tier {
  opacity: 0.55;
}

.page-about .about-tiers .about-tier:hover,
.page-about .about-tiers .about-tier:focus-within {
  opacity: 1;
  border-color: var(--cyan);
}

.page-about .about-closing-media {
  margin-top: 24px;
}

.page-about .about-closing-media img {
  max-height: 520px;
}

.page-about .about-cta {
  margin-top: clamp(38px, 6vw, 66px);
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid rgba(240, 180, 94, 0.35);
  border-radius: var(--r-lg) var(--r-sm) var(--r-lg) var(--r-sm);
  background:
    radial-gradient(80% 100% at 0% 0%, var(--about-gold-soft), transparent 62%),
    linear-gradient(150deg, rgba(16, 30, 51, 0.95), rgba(10, 19, 34, 0.96));
}

.page-about .about-cta h2 {
  margin: 0 0 0.7em;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .about-cta p {
  max-width: 62em;
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

@media (min-width: 700px) {
  .page-about .about-shell {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-index {
    top: calc(var(--header-h) + 20px);
    padding: 0 0 0 14px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    background: transparent;
  }

  .page-about .about-index__title {
    margin-bottom: 12px;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__list a {
    display: flex;
    width: 100%;
    padding: 9px 8px;
    white-space: normal;
  }

  .page-about .about-tiers {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-flow::before {
    display: block;
  }

  .page-about .about-panel__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-panel--flip .about-panel__grid {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .about-panel--flip .about-panel__text {
    order: 2;
  }

  .page-about .about-panel--flip .about-panel__media {
    order: 1;
  }

  .page-about .about-panel:nth-child(1) {
    margin-right: 10%;
  }

  .page-about .about-panel:nth-child(2) {
    margin-left: 7%;
    margin-right: 4%;
  }

  .page-about .about-panel:nth-child(3) {
    margin-left: 13%;
  }

  .page-about .about-panel:nth-child(4) {
    margin-left: 3%;
    margin-right: 9%;
  }

  .page-about .about-panel:nth-child(5) {
    margin-left: 10%;
    margin-right: 2%;
  }

  .page-about .about-panel:nth-child(6) {
    margin-left: 4%;
    margin-right: 6%;
  }

  .page-about .about-tiers {
    grid-template-columns: 1fr;
    max-width: 560px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-margin-note {
    display: block;
    position: absolute;
    top: 46px;
    left: 10px;
    writing-mode: vertical-rl;
    font-family: var(--font-num);
    font-size: 0.66rem;
    letter-spacing: 0.2em;
    color: rgba(159, 176, 198, 0.55);
    pointer-events: none;
    user-select: none;
  }

  .page-about .about-panel {
    padding-left: clamp(44px, 5vw, 62px);
  }
}

@media (max-width: 699px) {
  .page-about .about-spec thead {
    display: none;
  }

  .page-about .about-spec,
  .page-about .about-spec tbody,
  .page-about .about-spec tr,
  .page-about .about-spec td {
    display: block;
    width: 100%;
  }

  .page-about .about-spec tr {
    margin-bottom: 12px;
    padding: 13px 14px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: rgba(10, 19, 34, 0.46);
  }

  .page-about .about-spec td {
    padding: 6px 0;
    border: 0;
  }

  .page-about .about-spec td[data-label]::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 2px;
    color: var(--muted);
    font-size: 0.68rem;
    font-weight: 400;
    letter-spacing: 0.1em;
  }

  .page-about .about-spec td:first-child {
    padding-top: 0;
  }

  .page-about .about-tier--2 {
    margin-left: 6px;
  }

  .page-about .about-tier--3 {
    margin-left: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-tier,
  .page-about .about-timeline details::before {
    transition: none;
  }
}
<<<END>>>