.page-about {
  --about-rail: 216px;
  background: var(--ink);
  color: var(--fog);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(45, 226, 230, 0.12), transparent 62%),
    radial-gradient(90% 80% at -5% 105%, rgba(255, 106, 26, 0.08), transparent 66%),
    var(--charcoal);
  border-bottom: 1px solid var(--line);
  padding: clamp(26px, 5vw, 56px) 0 clamp(34px, 6vw, 68px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(230, 237, 240, 0.04) 0 1px, transparent 1px 5px);
  opacity: 0.55;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__lead h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(2.2rem, 8.4vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: clamp(0.98rem, 2.5vw, 1.08rem);
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .about-hero__panel {
  position: relative;
  padding: 20px 18px;
  background: rgba(26, 34, 40, 0.82);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--cyan);
  border-radius: var(--radius-a) var(--radius-b) var(--radius-a) var(--radius-b);
}

.page-about .about-hero__panel-title {
  margin: 0 0 14px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--silver);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .stat {
  display: grid;
  grid-template-columns: 4.6em minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(42, 53, 61, 0.7);
}

.page-about .stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .stat__num {
  font-size: 1.32rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .stat__label {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .about-hero__figure {
  position: relative;
  margin: clamp(26px, 4vw, 44px) 0 0;
  border-radius: var(--radius-b) var(--radius-a) var(--radius-b) var(--radius-a);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--graphite);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: 0.88;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  padding: 8px 14px;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--fog);
  background: rgba(6, 8, 10, 0.78);
  border-top-right-radius: var(--radius-b);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(32px, 6vw, 72px) 0 clamp(48px, 7vw, 88px);
}

.page-about .chapter-index {
  align-self: start;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .chapter-index__title {
  margin: 0 0 12px;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--silver);
}

.page-about .chapter-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .chapter-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  font-size: 0.85rem;
  color: var(--silver);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .chapter-index__link .mono {
  font-size: 0.72rem;
  color: var(--deep-cyan);
}

.page-about .chapter-index__link:hover,
.page-about .chapter-index__link:focus-visible {
  color: var(--fog);
  border-color: var(--cyan);
  background: var(--cyan-soft);
}

.page-about .chapter-index__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-chapters {
  display: grid;
  gap: clamp(36px, 6vw, 76px);
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 64px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-chapter__num {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--silver);
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(1.5rem, 5vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-chapter__text {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .flow__item {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--graphite);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-a) var(--radius-b) var(--radius-a) var(--radius-b);
}

.page-about .flow__item:nth-child(even) {
  background: rgba(17, 22, 26, 0.9);
  border-radius: var(--radius-b) var(--radius-a) var(--radius-b) var(--radius-a);
}

.page-about .flow__index {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .flow__name {
  margin: 8px 0 0;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .flow__desc {
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-quote {
  margin: 28px 0 0;
  padding: 18px 0 18px 20px;
  border-left: 3px solid var(--orange);
  background: linear-gradient(90deg, var(--orange-soft), transparent 70%);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 32em;
  font-size: clamp(1rem, 2.8vw, 1.16rem);
  line-height: 1.75;
  color: var(--fog);
}

.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 24px;
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .team-item {
  padding: 14px 0 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .team-item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .team-item__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .team-item__name::before {
  content: "▍";
  margin-right: 8px;
  color: var(--cyan);
}

.page-about .team-item__desc {
  margin: 6px 0 0 18px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-b) var(--radius-a) var(--radius-b) var(--radius-a);
  overflow: hidden;
  background: var(--graphite);
}

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

.page-about .about-figure--team img {
  aspect-ratio: 3 / 2;
}

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

.page-about .about-figure--archive img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__caption {
  padding: 10px 14px;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--silver);
  border-top: 1px solid var(--line-soft);
}

.page-about .archive-list {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 24px;
  display: grid;
  gap: 16px;
}

.page-about .archive-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(45, 226, 230, 0.22) 58%, var(--steel));
}

.page-about .archive-stage {
  position: relative;
  padding: 12px 16px 14px;
  background: rgba(26, 34, 40, 0.7);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-b) var(--radius-a) var(--radius-b) var(--radius-a);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .archive-stage::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 17px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--charcoal);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .archive-stage:hover,
.page-about .archive-stage:focus-within {
  border-color: var(--deep-cyan);
  background: rgba(17, 22, 26, 0.95);
}

.page-about .archive-stage:hover::before,
.page-about .archive-stage:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

.page-about .archive-stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .archive-stage__index {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--silver);
}

.page-about .archive-stage__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .archive-stage__desc {
  margin: 6px 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .principle {
  padding: 20px 18px;
  background: linear-gradient(160deg, rgba(45, 226, 230, 0.08), transparent 62%), var(--graphite);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-a) var(--radius-b) var(--radius-a) var(--radius-b);
}

.page-about .principle__title {
  margin: 0;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .principle__desc {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .version-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .version-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 16px 18px;
  background: var(--charcoal);
  border-bottom: 1px solid var(--line);
  border-left: 2px solid var(--steel);
  transition: border-left-color 0.2s var(--ease);
}

.page-about .version-item:hover {
  border-left-color: var(--orange);
}

.page-about .version-item__tag {
  justify-self: start;
  padding: 3px 9px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--fog);
  background: rgba(45, 226, 230, 0.14);
  border: 1px solid rgba(45, 226, 230, 0.4);
  border-radius: 3px;
}

.page-about .version-item__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--fog);
}

.page-about .version-item__desc {
  margin: 6px 0 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--silver);
}

.page-about .about-cta {
  padding: clamp(22px, 4vw, 36px);
  background:
    radial-gradient(110% 120% at 100% 0%, rgba(255, 106, 26, 0.12), transparent 58%),
    var(--graphite);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--orange);
  border-radius: var(--radius-b) var(--radius-a) var(--radius-b) var(--radius-a);
}

.page-about .about-cta__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(1.4rem, 4.6vw, 2.1rem);
  line-height: 1.22;
  color: var(--fog);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

@media (min-width: 720px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

  .page-about .version-item {
    grid-template-columns: 8.4em minmax(0, 1fr);
    align-items: start;
    gap: 16px;
  }

  .page-about .version-item__tag {
    margin-top: 2px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__top {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.78fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-hero__panel {
    margin-top: 8px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .chapter-index {
    position: sticky;
    top: 96px;
  }

  .page-about .chapter-index__list {
    display: grid;
    gap: 2px;
  }

  .page-about .chapter-index__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 0 8px 12px;
  }

  .page-about .chapter-index__link:hover,
  .page-about .chapter-index__link:focus-visible {
    border-left-color: var(--cyan);
    background: transparent;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-figure--team {
    margin-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-index__link,
  .page-about .archive-stage,
  .page-about .archive-stage::before,
  .page-about .version-item {
    transition: none;
  }
}
<<<END>>>