.page-about {
  --about-rail: 188px;
  --about-gap: 40px;
  display: block;
  background: var(--void);
  color: var(--text-secondary);
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 6vw, 56px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(920px 540px at 10% -14%, rgba(168, 85, 247, .22), transparent 62%),
    radial-gradient(720px 440px at 94% -4%, rgba(58, 199, 245, .10), transparent 60%),
    var(--void);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(43, 35, 68, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 35, 68, .35) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(70% 60% at 50% 40%, #000 20%, transparent 100%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 40%, #000 20%, transparent 100%);
}

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

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  color: var(--text-muted);
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .breadcrumb__link {
  color: var(--blue);
  text-decoration: none;
}

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

.page-about .breadcrumb__current::before {
  content: "/";
  margin-right: 8px;
  color: var(--hairline);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 52px);
  align-items: end;
}

.page-about .about-hero__copy .eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--violet-soft);
}

.page-about .about-hero__copy .display {
  margin: 0 0 22px;
  color: var(--text-primary);
  letter-spacing: -.02em;
  line-height: 1.05;
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 40em;
  font-size: clamp(.98rem, 1.4vw, 1.08rem);
  line-height: 1.9;
  color: var(--text-secondary);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 28px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--hairline);
  font-size: .84rem;
  color: var(--text-muted);
}

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

.page-about .about-hero__facts .mono {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--neon);
}

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

.page-about .about-hero__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-card);
  filter: saturate(.9) contrast(1.05);
}

/* ---------- BODY / CHAPTER RHYTHM ---------- */
.page-about .about-body {
  padding: clamp(40px, 7vw, 88px) 0 clamp(56px, 9vw, 120px);
}

.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding: clamp(34px, 6vw, 72px) 0;
  border-top: 1px solid var(--hairline);
}

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

.page-about .chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .chapter__num {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .chapter__num::after {
  content: "";
  display: inline-block;
  width: 34px;
  height: 1px;
  margin-left: 12px;
  vertical-align: middle;
  background: linear-gradient(to right, var(--neon), transparent);
}

.page-about .chapter__anno {
  font-size: .72rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--text-muted);
  writing-mode: horizontal-tb;
}

.page-about .chapter__title {
  margin: 0 0 20px;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -.01em;
}

.page-about .chapter__main p {
  margin: 0 0 18px;
  max-width: 40em;
  line-height: 1.9;
  font-size: .97rem;
}

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

.page-about .chapter__main a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 199, 245, .35);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .chapter__main a:hover {
  color: var(--violet-soft);
  border-color: var(--violet-soft);
}

/* ---------- TAXONOMY ---------- */
.page-about .taxonomy {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 30px 0;
}

.page-about .taxonomy__tree {
  display: grid;
  gap: 16px;
  padding: 22px 20px;
  background: linear-gradient(160deg, var(--slate), var(--ink));
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
}

.page-about .tree__branch {
  padding-left: 16px;
  border-left: 1px solid var(--hairline);
  transition: border-color .16s var(--ease);
}

.page-about .tree__branch:hover {
  border-left-color: var(--neon);
}

.page-about .tree__branch--accent {
  border-left-color: var(--deep-violet);
}

.page-about .tree__branch--accent:hover {
  border-left-color: var(--amber);
}

.page-about .tree__label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: .9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .tree__count {
  font-size: .82rem;
  color: var(--violet-soft);
}

.page-about .tree__leaves {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tree__leaves li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 5px 10px;
  font-size: .82rem;
  color: var(--text-secondary);
  background: rgba(43, 35, 68, .5);
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

.page-about .tree__branch:hover .tree__leaves li {
  border-color: var(--hairline);
  color: var(--text-primary);
}

.page-about .tree__leaves .mono {
  font-size: .8rem;
  color: var(--blue);
}

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

.page-about .taxonomy__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
}

/* ---------- RECORDS / STEPS ---------- */
.page-about .records__figure {
  margin: 28px 0;
}

.page-about .records__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  filter: saturate(.92);
}

.page-about .steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .steps__item {
  position: relative;
  padding: 20px 20px 20px 22px;
  background: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  transition: border-color .16s var(--ease), transform .22s var(--ease);
}

.page-about .steps__item:hover {
  border-color: var(--deep-violet);
  transform: translateY(-2px);
}

.page-about .steps__idx {
  display: block;
  margin-bottom: 8px;
  font-size: .82rem;
  color: var(--neon);
  letter-spacing: .12em;
}

.page-about .steps__name {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .steps__item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--text-muted);
}

/* ---------- TEAM ---------- */
.page-about .team {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 28px 0;
}

.page-about .team__block {
  position: relative;
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--hairline);
  background: var(--slate);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .team__block--a {
  background: linear-gradient(150deg, rgba(76, 29, 149, .55), var(--slate));
}

.page-about .team__block--b {
  background: linear-gradient(150deg, rgba(76, 29, 149, .32), var(--slate));
}

.page-about .team__block--c {
  background: linear-gradient(150deg, rgba(58, 199, 245, .14), var(--slate));
}

.page-about .team__block:hover {
  border-color: var(--neon);
}

.page-about .team__count {
  display: block;
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 10px;
}

.page-about .team__role {
  margin: 0 0 10px;
  font-size: .96rem;
  font-weight: 700;
  color: var(--violet-soft);
}

.page-about .team__desc {
  margin: 0;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ---------- STAGES ---------- */
.page-about .stages {
  display: grid;
  gap: 10px;
  margin: 26px 0 24px;
}

.page-about .stage {
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  background: var(--ink);
  overflow: hidden;
}

.page-about .stage--1 { border-left: 3px solid var(--deep-violet); }
.page-about .stage--2 { border-left: 3px solid var(--neon); }
.page-about .stage--3 { border-left: 3px solid var(--amber); }

.page-about .stage__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 18px 18px;
  cursor: pointer;
  list-style: none;
  transition: background .18s var(--ease);
}

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

.page-about .stage__summary:hover {
  background: rgba(168, 85, 247, .07);
}

.page-about .stage__index {
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--text-muted);
}

.page-about .stage__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .stage__arrow {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .stage__arrow::before,
.page-about .stage__arrow::after {
  content: "";
  position: absolute;
  background: var(--violet-soft);
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.page-about .stage__arrow::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-about .stage__arrow::after {
  left: 6px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-about .stage[open] .stage__arrow::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .stage__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--hairline);
}

.page-about .stage__body p {
  margin: 16px 0 0;
  font-size: .9rem;
  line-height: 1.9;
  color: var(--text-secondary);
  max-width: 40em;
}

/* ---------- CLOSING ---------- */
.page-about .chapter--closing {
  border-top: 1px solid var(--hairline);
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 34px;
}

.page-about .closing-actions .btn {
  text-decoration: none;
}

.page-about .closing-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 4px 0 0;
  border-top: 1px solid var(--hairline);
}

.page-about .closing-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 2px;
  border-bottom: 1px solid var(--hairline);
}

.page-about .closing-stats__row dt {
  font-size: .84rem;
  color: var(--text-muted);
  letter-spacing: .04em;
}

.page-about .closing-stats__row dd {
  margin: 0;
  font-size: .95rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ---------- REVEAL ---------- */
.page-about .chapter[data-reveal] {
  opacity: 1;
}

:where(html.has-reveal) .page-about .chapter[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
}

:where(html.has-reveal) .page-about .chapter[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}

/* ---------- MEDIA QUERIES ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }

  .page-about .taxonomy {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-about .team {
    flex-direction: row;
    align-items: stretch;
  }

  .page-about .team__block--a { flex: 5 1 0; }
  .page-about .team__block--b { flex: 3 1 0; }
  .page-about .team__block--c { flex: 4 1 0; }

  .page-about .closing-stats {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 40px;
  }
}

@media (min-width: 980px) {
  .page-about .chapter {
    grid-template-columns: var(--about-rail) 1fr;
    gap: var(--about-gap);
  }

  .page-about .chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .chapter__num::after {
    display: block;
    margin: 12px 0 0;
    width: 44px;
  }

  .page-about .chapter__anno {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    font-size: .7rem;
  }

  .page-about .steps {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .closing-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .closing-stats__row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    border-bottom: 0;
    border-left: 1px solid var(--hairline);
    padding: 6px 0 6px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .steps__item,
  .page-about .team__block,
  .page-about .tree__leaves li {
    transition: none;
  }

  :where(html.has-reveal) .page-about .chapter[data-reveal] {
    opacity: 1;
    transform: none;
  }
}