.page-about {
  --about-rail-w: 168px;
  --about-gap: clamp(22px, 4vw, 54px);
  display: block;
  color: var(--text);
  background:
    radial-gradient(120% 58% at 84% -6%, rgba(53, 240, 200, .10), transparent 62%),
    radial-gradient(88% 46% at 0% 14%, rgba(23, 168, 138, .10), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-850) 44%, var(--ink-900) 100%);
  overflow-x: clip;
}

.page-about .about-hero {
  padding: clamp(18px, 3.5vw, 40px) 0 clamp(44px, 7vw, 88px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 54px);
  align-items: center;
}

.page-about .about-hero-title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.2vw, 3.9rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-stats li {
  background: rgba(8, 24, 21, .82);
  padding: 16px 16px 18px;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.32rem, 2.6vw, 1.68rem);
  letter-spacing: -0.01em;
  color: var(--cyan);
  text-shadow: 0 0 18px rgba(53, 240, 200, .22);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-hero-visual {
  position: relative;
}

.page-about .about-hero-visual .media-frame {
  border-radius: var(--r-xl);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(53, 240, 200, .08), 0 0 48px rgba(23, 168, 138, .14);
}

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

.page-about .about-lamp {
  display: block;
  height: 2px;
  margin-top: 18px;
  background: linear-gradient(90deg, transparent, rgba(53, 240, 200, .75), transparent);
  filter: drop-shadow(0 0 10px rgba(53, 240, 200, .5));
}

.page-about .about-history .sec-note {
  max-width: 62ch;
}

.page-about .about-timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-rail-code {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--text);
  border-color: var(--line);
  background: rgba(18, 59, 51, .5);
}

.page-about .about-rail-link.is-current {
  color: var(--cyan);
  border-color: rgba(53, 240, 200, .45);
  background: rgba(53, 240, 200, .08);
}

.page-about .about-rail-link.is-current .about-rail-code {
  color: var(--cyan);
}

.page-about .about-stages {
  display: block;
}

.page-about .about-stage {
  position: relative;
  margin-bottom: clamp(16px, 2.6vw, 26px);
  padding: clamp(20px, 3.4vw, 32px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  background: linear-gradient(180deg, rgba(18, 59, 51, .48), rgba(8, 24, 21, .42));
  overflow: hidden;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, transparent, rgba(53, 240, 200, .55), transparent);
  opacity: 0;
  transition: opacity var(--t-mid) var(--ease);
}

.page-about .about-stage.is-inview::before {
  opacity: 1;
}

.page-about .stage-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
}

.page-about .stage-code {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  padding: 3px 9px;
  border: 1px solid rgba(53, 240, 200, .38);
  border-radius: var(--r-pill);
}

.page-about .stage-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.14rem, 2.3vw, 1.5rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  flex: 1 1 260px;
}

.page-about .stage-summary {
  margin: 14px 0 0;
  font-size: clamp(1.02rem, 1.7vw, 1.16rem);
  line-height: 1.6;
  color: var(--amber);
}

.page-about .stage-body {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .stage-points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .stage-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .stage-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-dim);
  box-shadow: 0 0 0 3px rgba(23, 168, 138, .16);
}

.page-about .stage-figure {
  margin: 22px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: rgba(8, 24, 21, .6);
}

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

.page-about .stage-figure figcaption {
  padding: 9px 14px 11px;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-bars {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-about .team-bar-row {
  display: block;
}

.page-about .team-bar-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .team-bar-name {
  font-size: 14.5px;
  color: var(--text);
}

.page-about .team-bar-count {
  font-size: 14px;
  color: var(--cyan);
}

.page-about .team-bar-track {
  display: block;
  margin-top: 8px;
  height: 10px;
  border-radius: var(--r-pill);
  background: rgba(36, 68, 61, .55);
  overflow: hidden;
}

.page-about .team-bar-fill {
  display: block;
  height: 100%;
  width: var(--w, 50%);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan-dim), var(--cyan));
  box-shadow: 0 0 14px rgba(53, 240, 200, .35);
}

.page-about .coop-cloud {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .coop-tag {
  display: block;
  padding: 11px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(18, 59, 51, .4);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .coop-tag:hover,
.page-about .coop-tag:focus-within {
  border-color: rgba(53, 240, 200, .5);
  background: rgba(53, 240, 200, .07);
}

.page-about .coop-name {
  display: block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text);
}

.page-about .coop-note {
  display: block;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  transition: max-height var(--t-mid) var(--ease), opacity var(--t-mid) var(--ease), margin-top var(--t-mid) var(--ease);
}

.page-about .coop-tag:hover .coop-note,
.page-about .coop-tag:focus-within .coop-note {
  max-height: 90px;
  opacity: 1;
  margin-top: 7px;
}

.page-about .about-cta {
  padding-top: 0;
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: center;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(90% 140% at 100% 0%, rgba(255, 90, 43, .14), transparent 58%),
    linear-gradient(180deg, rgba(18, 59, 51, .62), rgba(8, 24, 21, .5));
}

.page-about .about-cta-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.8vw, 1.86rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-cta-text {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 980px) {
  .page-about .about-timeline {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 4px 0;
    border-bottom: none;
  }

  .page-about .about-rail::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--line) 12%, var(--line) 88%, transparent);
  }

  .page-about .about-rail-link {
    position: relative;
    padding: 11px 0 11px 24px;
    border: none;
    border-radius: 0;
    background: none;
    font-size: 13.5px;
  }

  .page-about .about-rail-link:hover,
  .page-about .about-rail-link:focus-visible {
    background: none;
    color: var(--text);
  }

  .page-about .about-rail-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 9px;
    height: 9px;
    margin-top: -4.5px;
    border-radius: 50%;
    background: var(--ink-700);
    box-shadow: 0 0 0 1px var(--line);
    transition: background var(--t-fast) var(--ease), box-shadow var(--t-mid) var(--ease), transform var(--t-mid) var(--ease);
  }

  .page-about .about-rail-link.is-current {
    background: none;
    border: none;
  }

  .page-about .about-rail-link.is-current::before {
    background: var(--cyan);
    box-shadow: 0 0 0 3px rgba(53, 240, 200, .2), 0 0 14px rgba(53, 240, 200, .55);
    transform: scale(1.15);
  }
}

@media (min-width: 1180px) {
  .page-about .about-stages {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 24px);
    align-items: start;
  }

  .page-about .about-stage {
    margin-bottom: 0;
  }

  .page-about .about-stage:nth-child(-n+3),
  .page-about .about-stage:last-child {
    grid-column: 1 / -1;
  }

  .page-about .about-stage:nth-child(-n+3) .stage-body {
    max-width: 76ch;
  }
}

@media (hover: none) {
  .page-about .coop-note {
    max-height: none;
    opacity: 1;
    margin-top: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage::before,
  .page-about .about-rail-link,
  .page-about .about-rail-link::before,
  .page-about .coop-tag,
  .page-about .coop-note {
    transition: none;
  }
}

.page-about {
  --w: 1rem;
}