.page-about {
  --ab-gap: 20px;
  --ab-card: var(--panel);
  background: var(--night);
  color: var(--ivory);
  overflow-x: hidden;
}

.page-about .ab-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: calc(var(--header-offset) + 4px) 0 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mint);
}

.page-about .ab-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .ab-crumbs a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-crumbs a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .ab-crumbs li[aria-current="page"] {
  color: var(--lime);
}

/* ---------- hero ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 28px 0 64px;
  background:
    radial-gradient(880px 480px at 88% 8%, rgba(198, 255, 61, .12), transparent 64%),
    radial-gradient(660px 420px at 2% 92%, rgba(255, 138, 42, .09), transparent 68%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(44, 90, 73, .16) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(44, 90, 73, .12) 0 1px, transparent 1px 84px);
  mask-image: radial-gradient(circle at 60% 40%, #000 0%, transparent 78%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  gap: 36px;
}

.page-about .ab-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -.04em;
  color: var(--ivory);
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mint);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .ab-stat {
  padding: 14px 12px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: rgba(16, 55, 42, .55);
}

.page-about .ab-stat dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mint);
}

.page-about .ab-stat dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 5vw, 30px);
  font-weight: 800;
  color: var(--lime);
  line-height: 1;
}

.page-about .ab-stat__unit {
  font-size: .6em;
  margin-left: 2px;
}

.page-about .ab-hero__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .ab-hero__media img,
.page-about .ab-archive__media img,
.page-about .ab-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- shared chapter ---------- */
.page-about .ab-chapter {
  padding: 64px 0;
}

.page-about .ab-chapter--start {
  padding-top: 8px;
}

.page-about .ab-head {
  max-width: 62ch;
}

.page-about .ab-head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--ivory);
}

.page-about .ab-head .lede {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mint);
}

/* ---------- start section ---------- */
.page-about .ab-start {
  display: grid;
  gap: var(--ab-gap);
  margin-top: 34px;
}

.page-about .ab-start__body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ivory);
}

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

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

.page-about .ab-lane {
  padding: 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-faint);
  background: linear-gradient(160deg, rgba(16, 55, 42, .9), rgba(10, 38, 29, .9));
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .ab-lane:hover {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.page-about .ab-lane h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ivory);
}

.page-about .ab-lane p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mint);
}

/* ---------- flow ---------- */
.page-about .ab-flow {
  margin-top: 34px;
  display: grid;
  gap: 10px;
}

.page-about .ab-step {
  border-radius: var(--r-md);
  border: 1px solid var(--line-faint);
  background: rgba(13, 46, 35, .7);
  padding: 0 18px;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .ab-step[open] {
  border-color: var(--lime);
  background: rgba(16, 55, 42, .95);
  padding-bottom: 16px;
}

.page-about .ab-step > summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-step > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-step__no {
  font-size: 20px;
  font-weight: 800;
  color: var(--lime);
  letter-spacing: .02em;
}

.page-about .ab-step__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .ab-step__hint {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mint);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  padding: 4px 10px;
}

.page-about .ab-step[open] .ab-step__hint {
  color: var(--night);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-step__body p {
  margin: 0;
  padding-left: 2px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mint);
  border-left: 2px solid var(--orange);
  padding-left: 14px;
}

/* ---------- archive ---------- */
.page-about .ab-chapter--archive {
  background: var(--night-2);
}

.page-about .ab-archive__media {
  margin: 30px 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

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

.page-about .ab-yearband {
  display: flex;
  gap: 10px;
  margin: 26px 0 0;
  padding-bottom: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-yearband__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  background: rgba(5, 20, 15, .6);
  color: var(--mint);
  font-size: 13px;
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .ab-yearband__item .num {
  font-size: 15px;
  font-weight: 800;
  color: var(--lime);
}

.page-about .ab-yearband__item:hover {
  color: var(--night);
  background: var(--lime-soft);
  border-color: var(--lime-soft);
}

.page-about .ab-yearband__item:hover .num {
  color: var(--night);
}

.page-about .ab-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 26px;
}

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 26px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(255, 138, 42, .75), var(--line));
  opacity: .6;
}

.page-about .ab-milestone {
  position: relative;
  margin-bottom: 14px;
  padding: 18px 18px 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-faint);
  background: var(--panel-deep);
  scroll-margin-top: calc(var(--header-offset) + 16px);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .ab-milestone::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 26px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--night-2);
  border: 2px solid var(--lime);
}

.page-about .ab-milestone:hover {
  border-color: var(--lime);
  background: var(--panel);
}

.page-about .ab-milestone__ver {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--orange);
  opacity: .75;
  transition: opacity 180ms var(--ease), color 180ms var(--ease);
}

.page-about .ab-milestone:hover .ab-milestone__ver {
  opacity: 1;
  color: var(--orange-soft);
}

.page-about .ab-milestone h3 {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ivory);
}

.page-about .ab-milestone p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mint);
}

/* ---------- team ---------- */
.page-about .ab-team {
  display: grid;
  gap: 30px;
}

.page-about .ab-roles {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-role {
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: rgba(16, 55, 42, .75);
  border-left: 3px solid var(--lime);
}

.page-about .ab-role__num {
  display: block;
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-role h3 {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mint);
}

.page-about .ab-team__note {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px dashed var(--line-soft);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ivory);
  background: rgba(5, 20, 15, .5);
}

.page-about .ab-team__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

/* ---------- rhythm ---------- */
.page-about .ab-chapter--rhythm {
  background:
    linear-gradient(180deg, rgba(10, 38, 29, .9), rgba(5, 20, 15, .9));
}

.page-about .ab-rhythm {
  display: grid;
  gap: 14px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-rhythm__item {
  padding: 22px 20px;
  border-radius: var(--r-md);
  background: rgba(16, 55, 42, .8);
  border: 1px solid var(--line-faint);
  position: relative;
  overflow: hidden;
}

.page-about .ab-rhythm__item::after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(198, 255, 61, .2), transparent 70%);
}

.page-about .ab-rhythm__item .num-xl {
  display: block;
  font-size: clamp(38px, 9vw, 56px);
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-rhythm__item h3 {
  margin: 10px 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .ab-rhythm__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mint);
}

/* ---------- why ---------- */
.page-about .ab-why {
  display: grid;
  gap: 12px;
  margin-top: 32px;
}

.page-about .ab-why__item {
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-faint);
  background: rgba(13, 46, 35, .8);
  transition: border-color 200ms var(--ease);
}

.page-about .ab-why__item:hover {
  border-color: var(--orange);
}

.page-about .ab-why__item h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ivory);
}

.page-about .ab-why__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mint);
}

.page-about .ab-cta {
  margin-top: 34px;
  padding: 26px 22px;
  border-radius: var(--r-lg);
  background:
    linear-gradient(120deg, rgba(255, 138, 42, .16), rgba(16, 55, 42, .9) 62%);
  border: 1px solid var(--line-soft);
}

.page-about .ab-cta__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ivory);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- media queries ---------- */
@media (min-width: 720px) {
  .page-about .ab-gap,
  .page-about .ab-start,
  .page-about .ab-team {
    gap: 32px;
  }

  .page-about .ab-hero__stats {
    gap: 14px;
  }

  .page-about .ab-stat {
    padding: 18px 16px;
  }

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

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

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

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

  .page-about .ab-step {
    padding: 0 24px;
  }

  .page-about .ab-step > summary {
    padding: 20px 0;
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero {
    padding-bottom: 88px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .ab-start {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .ab-lanes {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }

  .page-about .ab-chapter {
    padding: 88px 0;
  }

  .page-about .ab-timeline {
    padding-left: 34px;
  }

  .page-about .ab-milestone {
    padding: 22px 26px;
  }

  .page-about .ab-milestone::before {
    left: -33px;
  }

  .page-about .ab-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
    padding: 30px 34px;
  }

  .page-about .ab-cta__actions {
    margin-top: 0;
    flex: 0 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-lane,
  .page-about .ab-milestone,
  .page-about .ab-step,
  .page-about .ab-yearband__item,
  .page-about .ab-why__item {
    transition: none;
    transform: none;
  }
}