.page-about {
  --about-gap: clamp(2.6rem, 6vw, 5rem);
  --about-line: var(--line);
  color: var(--mist);
  overflow-x: clip;
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-crumb {
  padding-block: clamp(1rem, 3vw, 1.8rem) 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .about-crumb__current {
  color: var(--cyan);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  padding-block: clamp(1.4rem, 3.5vw, 2.6rem) var(--about-gap);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--silver);
  margin: 0;
}

.page-about .about-hero__eyebrow .chapter-no {
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0.7rem 0 0;
  font-size: clamp(2.7rem, 9vw, 6rem);
  line-height: 1.02;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-stretch: 92%;
  text-wrap: balance;
}

.page-about .about-hero__mark {
  color: var(--orange);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.06rem);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-index {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.2rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-index__item {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.85rem 0 0.85rem 0;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--silver);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    padding-left var(--dur) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--mist);
  border-left-color: var(--orange);
  padding-left: 0.65rem;
}

.page-about .about-index__no {
  color: var(--cyan);
  font-size: 0.72rem;
}

/* ---------- claims ---------- */
.page-about .about-claims {
  display: grid;
  gap: 0;
  padding-block: var(--about-gap);
  border-bottom: 1px solid var(--about-line);
}

.page-about .claim {
  border-top: 2px solid var(--about-line);
  padding: 1.2rem 0 1.6rem;
  scroll-margin-top: 5rem;
  transition: border-color var(--dur) var(--ease);
}

.page-about .claim:target {
  border-top-color: var(--orange);
}

.page-about .claim__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .claim__title {
  margin: 0.55rem 0 0.6rem;
  font-size: 1.32rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .claim__text {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--silver);
  max-width: 34ch;
}

/* ---------- generic section ---------- */
.page-about .about-sec {
  padding-block: var(--about-gap);
  border-bottom: 1px solid var(--about-line);
}

.page-about .sec-head {
  max-width: 62ch;
  margin-bottom: clamp(1.6rem, 3.5vw, 2.6rem);
}

.page-about .sec-head__no {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--silver);
}

.page-about .sec-head__no .chapter-no {
  color: var(--cyan);
}

.page-about .sec-head__title {
  margin: 0.6rem 0 0;
  font-size: clamp(1.65rem, 4.2vw, 2.5rem);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-stretch: 92%;
  text-wrap: balance;
}

.page-about .sec-head__lede {
  margin: 0.85rem 0 0;
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--silver);
  max-width: 54ch;
}

/* ---------- scene ---------- */
.page-about .scene {
  border-top: 1px solid var(--about-line);
}

.page-about .scene__row {
  display: grid;
  gap: 0.45rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .scene__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .scene__val {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--silver);
  max-width: 62ch;
}

/* ---------- figures ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--slate);
}

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

.page-about .figure__caption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .timeline-figure {
  margin-bottom: clamp(1.8rem, 4vw, 3rem);
}

.page-about .timeline-figure .figure__frame {
  aspect-ratio: 2 / 1;
}

.page-about .timeline-figure .figure__img {
  height: 100%;
}

/* ---------- timeline ---------- */
.page-about .timeline {
  position: relative;
  padding-left: 24px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 1px;
  background: var(--about-line);
}

.page-about .ver {
  position: relative;
  padding: 0.9rem 0 1.05rem;
  border-top: 1px solid var(--about-line);
  outline: none;
}

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

.page-about .ver::before {
  content: "";
  position: absolute;
  left: -27.5px;
  top: 1.5rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .ver--key::before {
  background: var(--orange);
}

.page-about .ver:focus-visible::before {
  box-shadow: 0 0 0 4px rgba(52, 226, 210, 0.22);
}

.page-about .ver__year {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .ver--key .ver__year {
  color: var(--orange);
}

.page-about .ver__name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .ver__text {
  margin: 0.45rem 0 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--silver);
  max-width: 60ch;
}

.page-about .ver__note {
  margin: 0.55rem 0 0;
  padding-left: 0.75rem;
  border-left: 1px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: var(--silver);
  max-width: 58ch;
}

/* ---------- crew ---------- */
.page-about .crew {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .crew__side {
  display: grid;
  gap: 1.2rem;
  align-content: start;
}

.page-about .crew__stat {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin: 0;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .crew__stat-num {
  font-size: clamp(3rem, 9vw, 4.6rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .crew__stat-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--silver);
}

.page-about .crew__figure .figure__frame {
  aspect-ratio: 3 / 2;
}

.page-about .crew__figure .figure__img {
  height: 100%;
}

.page-about .roles {
  display: grid;
  align-content: start;
}

.page-about .role {
  padding: 1.05rem 0;
  border-top: 1px solid var(--about-line);
}

.page-about .role:first-child {
  border-top: 2px solid var(--orange);
}

.page-about .role__name {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .role__count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .role__text {
  margin: 0.4rem 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .crew__note {
  margin: clamp(1.4rem, 3vw, 2.2rem) 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--about-line);
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--silver);
  max-width: 62ch;
}

/* ---------- cadence ---------- */
.page-about .cadence {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .cadence__figure .figure__frame {
  aspect-ratio: 10 / 7;
}

.page-about .cadence__figure .figure__img {
  height: 100%;
}

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.page-about .step {
  padding: 1rem 0 1.15rem;
  border-top: 1px solid var(--about-line);
}

.page-about .step:first-child {
  border-top: 2px solid var(--cyan);
}

.page-about .step__cycle {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .step__title {
  margin: 0.45rem 0 0.4rem;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .step__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--silver);
  max-width: 60ch;
}

/* ---------- full-bleed band ---------- */
.page-about .about-band {
  background: var(--night);
  margin-inline: calc(50% - 50vw);
  padding-inline: calc(50vw - 50%);
  padding-block: var(--about-gap);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-band__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.page-about .region {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .region__cell {
  background: var(--slate);
  padding: clamp(1.1rem, 3vw, 1.7rem);
}

.page-about .region__num {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .region__unit {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  margin-left: 0.25rem;
  color: var(--mist);
}

.page-about .region__label {
  margin: 0.6rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .region__text {
  margin: 0.55rem 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- partners ---------- */
.page-about .partners {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-block: 1px solid var(--about-line);
}

.page-about .partner {
  background: var(--deep);
  padding: clamp(1.1rem, 3vw, 1.8rem) 0;
  display: grid;
  gap: 0.4rem;
  align-content: start;
}

.page-about .partner__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .partner__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .partner__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--silver);
  max-width: 46ch;
}

/* ---------- next ---------- */
.page-about .about-next {
  display: grid;
  gap: 1.4rem;
  padding-top: var(--about-gap);
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--mist);
  max-width: 26ch;
}

.page-about .about-next__text {
  margin: 0.7rem 0 0;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--silver);
  max-width: 50ch;
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .about-link {
  display: inline-block;
  padding: 0.6rem 1rem;
  border: 1px solid var(--line);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

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

.page-about .about-link--signal {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--deep);
  font-weight: 700;
}

.page-about .about-link--signal:hover,
.page-about .about-link--signal:focus-visible {
  background: var(--warm);
  border-color: var(--warm);
  color: var(--deep);
}

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .page-about .roles {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .role {
    padding: 1.05rem clamp(0.9rem, 2vw, 1.5rem) 1.15rem 0;
  }

  .page-about .role:nth-child(2n) {
    padding-left: clamp(0.9rem, 2vw, 1.5rem);
    border-left: 1px solid var(--about-line);
  }

  .page-about .partners {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .partner {
    padding-inline: clamp(1rem, 2.5vw, 1.8rem);
  }

  .page-about .partner:first-child {
    padding-left: 0;
  }
}

@media (min-width: 820px) {
  .page-about .about-claims {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .claim {
    padding: 1.3rem clamp(1rem, 2.4vw, 1.8rem) 1.8rem 0;
  }

  .page-about .claim:first-child {
    padding-left: 0;
  }

  .page-about .claim + .claim {
    border-left: 1px solid var(--about-line);
    padding-left: clamp(1rem, 2.4vw, 1.8rem);
  }

  .page-about .scene__row {
    grid-template-columns: 15rem 1fr;
    gap: 2rem;
    align-items: baseline;
    padding: 1.25rem 0;
  }

  .page-about .region {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-next {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 2rem;
  }

  .page-about .about-next__links {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-hero__aside {
    padding-top: clamp(2.2rem, 5vw, 3.6rem);
  }

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

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

  .page-about .ver {
    display: grid;
    grid-template-columns: 6rem 1fr;
    gap: 1.6rem;
    padding: 1rem 0 1.2rem;
  }

  .page-about .ver__year {
    margin: 0;
    padding-top: 0.15rem;
    text-align: right;
  }

  .page-about .ver::before {
    top: 1.55rem;
  }
}

@media (hover: hover) and (min-width: 960px) {
  .page-about .ver__note {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease),
      margin-top var(--dur) var(--ease);
  }

  .page-about .ver:hover .ver__note,
  .page-about .ver:focus .ver__note,
  .page-about .ver:focus-within .ver__note {
    max-height: 9rem;
    opacity: 1;
    margin-top: 0.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .claim,
  .page-about .ver__note,
  .page-about .about-link {
    transition: none;
  }

  .page-about .ver__note {
    max-height: none;
    opacity: 1;
  }
}