.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 22px 0 clamp(36px, 5vw, 64px);
  background:
    radial-gradient(900px 420px at 84% -12%, rgba(53, 242, 214, 0.14), transparent 70%),
    linear-gradient(180deg, var(--ink-1) 0%, var(--ink-0) 88%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -200px;
  width: 420px;
  height: 420px;
  border: 1px solid rgba(53, 242, 214, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -120px;
  width: 260px;
  height: 260px;
  border: 1px dashed rgba(255, 122, 47, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 940px;
}

.page-about .about-hero__eyebrow {
  margin: 20px 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: clamp(28px, 4.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(234, 242, 248, 0.82);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .hero-stat {
  background: var(--ink-1);
  padding: 16px 18px;
}

.page-about .hero-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .hero-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .hero-stat--alert .hero-stat__num {
  color: var(--orange);
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-flow {
  min-width: 0;
}

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

.page-about .rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px 9px 0;
  font-size: 12.5px;
  color: var(--muted);
  text-decoration: none;
  border-right: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .rail__link span {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  color: var(--line);
  transition: color 0.2s var(--ease);
}

.page-about .rail__link:hover,
.page-about .rail__link.is-active {
  color: var(--cyan);
  border-right-color: var(--orange);
}

.page-about .rail__link:hover span,
.page-about .rail__link.is-active span {
  color: var(--orange);
}

.page-about .about-section {
  padding: clamp(36px, 5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-flow > .about-section:first-child {
  border-top: 0;
  padding-top: clamp(32px, 4.4vw, 52px);
}

.page-about .about-head {
  position: relative;
  padding-top: 22px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    var(--cyan) 0%,
    rgba(53, 242, 214, 0.35) 28%,
    rgba(53, 242, 214, 0) 72%
  );
}

.page-about .about-head__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(38px, 5.4vw, 64px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(53, 242, 214, 0.28);
}

.page-about .about-head__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(22px, 3.1vw, 34px);
  line-height: 1.35;
  color: var(--paper);
  max-width: 22em;
}

.page-about .about-prose {
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(234, 242, 248, 0.84);
}

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

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background:
    linear-gradient(160deg, rgba(53, 242, 214, 0.07), rgba(53, 242, 214, 0) 58%),
    var(--ink-1);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-timeline__figure img {
  max-height: 460px;
  object-position: top center;
}

.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px dashed var(--line);
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .stage-list > li {
  position: relative;
}

.page-about .stage-list > li::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--cyan);
}

.page-about .stage {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  padding: 14px 16px;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .stage:hover,
.page-about .stage:focus-within {
  border-color: var(--cyan);
}

.page-about .stage[open] {
  background: var(--ink-1);
}

.page-about .stage__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  cursor: pointer;
  list-style: none;
  outline: none;
}

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

.page-about .stage__summary::marker {
  content: "";
}

.page-about .stage__range {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  background: var(--pool);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .stage__title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

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

.page-about .stage[open] > .stage__summary::after {
  content: "−";
}

.page-about .stage__body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .stage__body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(234, 242, 248, 0.78);
}

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

.page-about .stage__list li {
  font-size: 12.5px;
  color: var(--cyan-soft);
  background: rgba(53, 242, 214, 0.08);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 10px;
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-bottom: clamp(22px, 3.2vw, 34px);
}

.page-about .squad-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .squad {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .squad:hover {
  border-color: var(--cyan);
  background: var(--pool);
  transform: translateY(-2px);
}

.page-about .squad__name {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .squad__num {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .squad__duty {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-figure--wide {
  margin-bottom: clamp(20px, 3vw, 28px);
}

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

.page-about .flow__node {
  position: relative;
  background: var(--ink-1);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  padding: 16px 14px 14px;
  transition: border-color 0.2s var(--ease);
}

.page-about .flow__node:hover {
  border-color: var(--cyan);
}

.page-about .flow__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-bottom: 10px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
}

.page-about .flow__title {
  margin: 0 0 6px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flow__node p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-panel {
  margin-top: clamp(20px, 3vw, 28px);
  padding: 16px 18px;
  border-left: 2px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--ink-1);
}

.page-about .about-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(234, 242, 248, 0.82);
}

.page-about .version-list {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .version {
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .version__k {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 19px;
  color: var(--cyan-soft);
}

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

.page-about .version-now {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background: linear-gradient(120deg, var(--pool) 0%, var(--panel) 68%);
}

.page-about .version-now__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-0);
  background: var(--orange);
  border-radius: 999px;
}

.page-about .version-now p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(234, 242, 248, 0.85);
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.page-about .chip {
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--ink-1);
  color: var(--muted);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .chip:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan);
}

.page-about .chip[aria-pressed="true"] {
  color: var(--ink-0);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

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

.page-about .cred {
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .cred:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .cred__k {
  display: block;
  margin-bottom: 6px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .cred__d {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-next {
  margin-top: clamp(36px, 5vw, 60px);
  padding: clamp(24px, 3.4vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background:
    radial-gradient(600px 260px at 100% 0%, rgba(255, 122, 47, 0.12), transparent 70%),
    var(--ink-1);
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-next__text {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(234, 242, 248, 0.8);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 700px) {
  .page-about .cred-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 760px) {
  .page-about .squad-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: 268px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .flow__node:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 29px;
    right: -20px;
    width: 20px;
    border-top: 1px dashed var(--line);
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: clamp(24px, 3vw, 44px);
  }

  .page-about .rail {
    display: flex;
    flex-direction: column;
    gap: 2px;
    position: sticky;
    top: 112px;
    align-self: start;
    padding-top: clamp(32px, 4.4vw, 52px);
    border-right: 1px solid var(--line);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .squad,
  .page-about .cred,
  .page-about .chip,
  .page-about .rail__link,
  .page-about .flow__node {
    transition: none;
  }

  .page-about .squad:hover,
  .page-about .cred:hover {
    transform: none;
  }
}