.page-about {
  --ab-line: rgba(242, 247, 245, 0.14);
  --ab-gap: clamp(18px, 3vw, 28px);
  overflow-x: hidden;
}

.page-about .ab-mono {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--neon-soft);
}

.page-about .ab-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--neon);
  letter-spacing: 0.04em;
}

/* ---------- hero ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 5vw, 52px) 0 clamp(30px, 5vw, 56px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -22%;
  left: -35%;
  right: -35%;
  height: 82%;
  background: linear-gradient(118deg, rgba(53, 230, 168, 0.2) 0%, rgba(53, 230, 168, 0.06) 42%, rgba(255, 92, 51, 0.11) 76%, rgba(255, 92, 51, 0) 100%);
  clip-path: polygon(0 0, 100% 0, 66% 100%, 0 76%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  align-items: end;
}

.page-about .ab-hero h1 {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 54px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  max-width: 52ch;
  margin: 0;
  color: var(--body-text);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-hero__facts li {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  background: var(--glass);
  border-left: 2px solid var(--neon);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .ab-fact {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

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

/* ---------- shared spacing overrides in scope ---------- */
.page-about .section {
  padding: clamp(38px, 6vw, 74px) 0;
}

.page-about .aside {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .aside__rail {
  border-left: 2px solid var(--neon);
  padding-left: 14px;
}

.page-about .ab-railnote {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

.page-about .aside__body h2 {
  margin-top: 0;
}

/* ---------- column map ---------- */
.page-about .ab-map__figure {
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding: 12px 4px 4px;
  background: linear-gradient(90deg, rgba(20, 48, 42, 0.65), rgba(16, 20, 19, 0.2));
  border-radius: var(--radius);
}

.page-about .ab-map__figure svg {
  display: block;
  width: 100%;
  height: auto;
}

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

.page-about .ab-col {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--neon);
  border-radius: var(--radius);
  padding: 15px 16px 18px;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .ab-col:hover,
.page-about .ab-col:focus-within {
  transform: translateY(-2px);
  border-color: var(--neon-soft);
  box-shadow: var(--shadow-lift);
}

.page-about .ab-col__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .ab-col__idx {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .ab-col__count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 2px 9px;
}

.page-about .ab-col__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .ab-col__name a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .ab-col__name a:hover,
.page-about .ab-col__name a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about .ab-col__desc {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.72;
}

/* ---------- team ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-team__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
}

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

.page-about .ab-team__item {
  position: relative;
  padding: 16px 18px 18px 56px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-team__item:hover {
  border-color: var(--neon-soft);
  transform: translateY(-2px);
}

.page-about .ab-team__idx {
  position: absolute;
  top: 16px;
  left: 18px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--neon);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
}

.page-about .ab-team__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .ab-team__item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.78;
}

/* ---------- glossary ---------- */
.page-about .ab-glossary {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-glossary__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
}

.page-about .ab-glossary__body h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .ab-glossary__body p {
  margin: 0 0 18px;
  color: var(--body-text);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .ab-terms {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-terms li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-terms__k {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .ab-terms__v {
  color: var(--body-text);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .ab-glossary__foot {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.8;
}

/* ---------- timeline ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-tl__item {
  position: relative;
  flex: 0 0 clamp(232px, 76vw, 286px);
  scroll-snap-align: start;
  padding: 30px 16px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), rgba(53, 230, 168, 0.22));
}

.page-about .ab-tl__item::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 16px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 5px rgba(53, 230, 168, 0.16);
}

.page-about .ab-tl__item:hover,
.page-about .ab-tl__item:focus-within {
  border-color: var(--neon-soft);
  transform: translateY(-2px);
}

.page-about .ab-tl__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .ab-tl__ver {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--ember);
  line-height: 1;
}

.page-about .ab-tl__body {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.78;
}

/* ---------- data ---------- */
.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-stat {
  display: block;
  padding: 16px 14px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--neon);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .ab-stat .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.1;
  color: var(--paper);
  letter-spacing: 0.04em;
}

.page-about .ab-stat .stat__label {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
}

.page-about .ab-data__note {
  margin-top: 22px;
  padding: 18px 20px;
  background: linear-gradient(100deg, rgba(255, 92, 51, 0.12), rgba(53, 230, 168, 0.05));
  border-left: 3px solid var(--ember);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .ab-data__note p {
  margin: 0;
  max-width: 68ch;
  color: var(--body-text);
  font-size: 0.94rem;
  line-height: 1.85;
}

/* ---------- next ---------- */
.page-about .ab-next {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .ab-next__inner {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-next__copy h2 {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.2vw, 36px);
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .ab-next__copy p {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .ab-next__copy a {
  color: var(--neon-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- breakpoints ---------- */
@media (min-width: 620px) {
  .page-about .ab-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-terms li {
    grid-template-columns: minmax(96px, 140px) 1fr;
    gap: 18px;
  }
}

@media (min-width: 860px) {
  .page-about .aside {
    grid-template-columns: minmax(150px, 2.6fr) 9fr;
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .ab-team__grid {
    grid-template-columns: 1.05fr 1fr;
    gap: clamp(22px, 3vw, 38px);
    align-items: start;
  }

  .page-about .ab-glossary {
    grid-template-columns: 0.72fr 1.28fr;
    gap: clamp(24px, 3.6vw, 46px);
    align-items: center;
  }

  .page-about .ab-next__inner {
    grid-template-columns: 1.4fr 1fr;
    gap: clamp(24px, 4vw, 52px);
    align-items: center;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-cols {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-col,
  .page-about .ab-team__item,
  .page-about .ab-tl__item {
    transition: none;
  }

  .page-about .ab-col:hover,
  .page-about .ab-col:focus-within,
  .page-about .ab-team__item:hover,
  .page-about .ab-tl__item:hover,
  .page-about .ab-tl__item:focus-within {
    transform: none;
  }
}