.page-about {
  --about-rail-w: 300px;
  background: var(--ink-900);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about .about-topline {
  padding: clamp(20px, 4vw, 34px) 0 0;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumbs .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 8px 0 4px;
  color: var(--line-mid);
}

.page-about .breadcrumb-link {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  text-decoration: underline;
}

/* hero */
.page-about .about-hero {
  padding: clamp(22px, 4vw, 48px) 0 clamp(30px, 5vw, 60px);
  background:
    radial-gradient(120% 80% at 92% 0%, rgba(34, 211, 238, 0.14), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 8vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 46ch;
  color: var(--mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--mist);
  line-height: 1.6;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .about-stats__num {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  color: var(--lime);
  line-height: 1.1;
}

.page-about .about-stats__label {
  font-size: 13px;
  color: var(--mist);
}

/* canvas: sticky rail + .page-about */
.page-about .about-canvas {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-top: clamp(20px, 4vw, 40px);
}

.page-about .about-rail {
  border-left: 2px solid var(--line-mid);
  padding-left: 16px;
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-condensed);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--coral);
}

.page-about .about-rail__years {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-rail__years li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-rail__years .num {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-rail__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-rail__index a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-mid);
  background: var(--glass-cyan);
  color: var(--paper);
  font-size: 12px;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.page-about .about-rail__index a:hover,
.page-about .about-rail__index a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-1px);
}

/* sections */
.page-about .about-sec {
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 96px;
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-sec h3 {
  margin: 10px 0 0;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-p {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .tag--slant {
  display: inline-block;
  padding: 4px 12px 4px 10px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-900);
}

/* four entries */
.page-about .about-four {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-four li {
  padding: 18px 18px 20px;
  background: var(--ink-800);
}

.page-about .about-four p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* principles */
.page-about .about-principles {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-principles li {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--ink-800);
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan);
}

.page-about .about-principles li:nth-child(1) {
  border-left-color: var(--coral);
}

.page-about .about-principles li:nth-child(3) {
  border-left-color: var(--lime);
}

.page-about .about-principles p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* flow */
.page-about .about-flowline {
  display: block;
  width: 100%;
  height: 40px;
  margin: 26px 0 6px;
  color: var(--ink-700);
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__no {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .about-flow p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cadence li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--glass-cyan);
  border: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--mist);
  line-height: 1.6;
}

.page-about .about-cadence .num {
  font-size: 22px;
  font-weight: 800;
  color: var(--lime);
  line-height: 1;
}

.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
}

/* timeline */
.page-about .about-timeline {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-era {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-era[open] {
  border-color: rgba(34, 211, 238, 0.42);
}

.page-about .about-era summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-era summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-era[open] summary::after {
  content: "−";
}

.page-about .about-era__year {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 800;
  color: var(--coral);
  line-height: 1;
}

.page-about .about-era[open] .about-era__year {
  color: var(--lime);
}

.page-about .about-era__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-era__body {
  padding: 0 18px 18px;
}

.page-about .about-era__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* team */
.page-about .about-teamstats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-teamstats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-teamstats .num {
  flex: none;
  font-size: 26px;
  font-weight: 800;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-ecosystem {
  display: flex;
  gap: 14px;
  margin-top: 22px;
  padding-bottom: 10px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-chip {
  flex: 0 0 78%;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-mid);
  background: linear-gradient(160deg, rgba(34, 211, 238, 0.14), rgba(6, 26, 43, 0.9));
  color: var(--paper);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.page-about .about-chip:hover,
.page-about .about-chip:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-chip__num {
  font-size: 28px;
  font-weight: 800;
  color: var(--lime);
  line-height: 1;
}

.page-about .about-chip__title {
  font-size: 15px;
  font-weight: 700;
}

.page-about .about-chip__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* closing */
.page-about .about-sec--closing {
  background: linear-gradient(180deg, rgba(24, 76, 107, 0.34), rgba(6, 26, 43, 0));
  border-radius: var(--radius-lg);
  padding-left: clamp(14px, 2vw, 26px);
  padding-right: clamp(14px, 2vw, 26px);
}

.page-about .about-promises {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-promises li {
  padding-top: 14px;
  border-top: 1px solid var(--line-mid);
}

.page-about .about-promises h3 {
  margin: 0;
}

.page-about .about-promises p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: 30px;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-mid);
  background: var(--ink-800);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-teamstats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-chip {
    flex-basis: 46%;
  }

  .page-about .about-promises {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-canvas {
    grid-template-columns: minmax(220px, var(--about-rail-w)) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-rail__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-rail__index a {
    border-color: transparent;
    background: transparent;
    padding: 4px 0 4px 12px;
    position: relative;
  }

  .page-about .about-rail__index a::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 1px;
    background: var(--line-mid);
    transform: translateY(-50%);
    transition: width 160ms ease, background-color 160ms ease;
  }

  .page-about .about-rail__index a:hover,
  .page-about .about-rail__index a:focus-visible {
    background: transparent;
    transform: none;
  }

  .page-about .about-rail__index a:hover::before,
  .page-about .about-rail__index a:focus-visible::before {
    width: 12px;
    background: var(--cyan);
  }

  .page-about .about-chip {
    flex-basis: 32%;
    min-width: 260px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__index a,
  .page-about .about-chip {
    transition: none;
  }

  .page-about .about-chip:hover,
  .page-about .about-chip:focus-visible,
  .page-about .about-rail__index a:hover,
  .page-about .about-rail__index a:focus-visible {
    transform: none;
  }
}
<<<END>>>