.page-about {
  --about-pad: clamp(2.25rem, 6vw, 4.5rem);
  --about-line-gap: 1.75rem;
  display: block;
}

.page-about > section {
  padding: var(--about-pad) 0;
}

.page-about .block-head {
  max-width: 46rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .block-head .eyebrow {
  margin-bottom: 0.6rem;
}

.page-about .block-head .lede {
  margin-top: 0.9rem;
}

.page-about [data-filter-hidden="true"] {
  display: none;
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: var(--about-pad);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3.25rem);
  align-items: start;
}

.page-about .about-hero__lead .eyebrow {
  margin-bottom: 0.75rem;
}

.page-about .about-hero__lead .lede {
  margin-top: 1rem;
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__media .img-frame {
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__caption {
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: var(--celadon);
  line-height: 1.6;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .hero-stat {
  background: var(--rice);
  padding: 1rem 0.25rem 1rem 0;
}

.page-about .hero-stat__label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--celadon);
  margin: 0 0 0.35rem;
}

.page-about .hero-stat__num {
  margin: 0;
  font-size: clamp(1.25rem, 3.4vw, 1.625rem);
  color: var(--cinnabar);
  line-height: 1.2;
}

/* ---------- Timeline ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-line-gap);
  position: relative;
  max-width: 46rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.4rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 75, 0.18) 100%);
}

.page-about .timeline-node {
  position: relative;
  padding-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .timeline-node:last-child {
  padding-bottom: 0;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -1.38rem;
  top: 0.4rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 75, 0.14);
}

.page-about .timeline-node__meta {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--celadon);
}

.page-about .timeline-node__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .timeline-node__text {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 40ch;
}

.page-about .fold {
  border-top: 1px solid var(--line);
  padding-top: 0.6rem;
}

.page-about .fold__summary {
  cursor: pointer;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--cinnabar);
  list-style: none;
}

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

.page-about .fold__summary::before {
  content: "＋ ";
  font-family: var(--font-mono);
}

.page-about .fold[open] .fold__summary::before {
  content: "－ ";
}

.page-about .fold__body {
  padding-top: 0.6rem;
}

.page-about .fold__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 42ch;
}

/* ---------- Product lines ---------- */

.page-about .about-lines .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .line-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

.page-about .line-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cinnabar);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 1.75rem);
  box-shadow: var(--shadow-soft);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .line-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .line-card__code {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--celadon);
}

.page-about .line-card__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.375rem, 3vw, 1.625rem);
  color: var(--cinnabar-deep);
}

.page-about .line-card__text {
  margin: 0 0 1rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .line-card__list {
  margin: 0;
  padding: 0.9rem 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .line-card__list li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.55rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .line-card__list li:last-child {
  margin-bottom: 0;
}

.page-about .line-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 0.3rem;
  height: 0.3rem;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .about-lines__figure {
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
}

.page-about .about-lines__figure .img-frame {
  border: 1px solid var(--line);
}

.page-about .about-lines__figure figcaption {
  margin-top: 0.7rem;
  font-size: 0.8125rem;
  color: var(--celadon);
  line-height: 1.6;
}

/* ---------- Boards ---------- */

.page-about .board {
  border-radius: var(--radius);
  padding: clamp(1.5rem, 5vw, 3rem);
}

.page-about .board--indigo {
  background: var(--indigo);
  color: var(--rice);
}

.page-about .board--paper {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .board__head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .board__head .display-2 {
  margin: 0.5rem 0 0;
}

.page-about .board--indigo .display-2 {
  color: var(--rice);
}

.page-about .board--paper .display-2 {
  color: var(--cinnabar-deep);
}

.page-about .eyebrow--on-dark {
  color: var(--gold-pale);
}

.page-about .board__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .board__copy p {
  margin: 0 0 0.9rem;
  font-size: 1rem;
  line-height: 1.8;
  max-width: 40ch;
}

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

.page-about .board--indigo .board__copy p {
  color: rgba(246, 241, 231, 0.82);
}

.page-about .board--paper .board__copy p {
  color: var(--ink-soft);
}

/* ---------- Capacity chart ---------- */

.page-about .capacity-figure {
  margin: 0;
}

.page-about .capacity-chart {
  display: block;
  width: 100%;
  height: auto;
  padding: 0.75rem 0 0.25rem;
}

.page-about .capacity-chart text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  fill: rgba(246, 241, 231, 0.66);
}

.page-about .capacity-chart .chart-value {
  fill: var(--gold-pale);
}

.page-about .capacity-chart .chart-bar-a {
  fill: rgba(246, 241, 231, 0.26);
}

.page-about .capacity-chart .chart-bar-b {
  fill: var(--gold);
}

.page-about .capacity-figure figcaption {
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.62);
}

/* ---------- Team ---------- */

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-stat {
  background: var(--paper);
  padding: 1rem 0.9rem;
}

.page-about .team-stat__label {
  margin: 0 0 0.4rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--celadon);
  line-height: 1.5;
}

.page-about .team-stat__num {
  margin: 0;
  font-size: clamp(1.125rem, 3vw, 1.375rem);
  color: var(--indigo);
  line-height: 1.3;
}

/* ---------- Certificates ---------- */

.page-about .cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .cert-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .cert-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .cert-card__code {
  margin: 0 0 0.5rem;
  display: inline-block;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--cinnabar-deep);
  background: var(--gold-pale);
  border: 1px solid rgba(201, 162, 75, 0.5);
  border-radius: var(--radius);
  padding: 0.15rem 0.5rem;
}

.page-about .cert-card__name {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  color: var(--ink);
}

.page-about .cert-card__use {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- Channels ---------- */

.page-about .channel-wrap {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(2rem, 5vw, 3rem);
}

.page-about .channel-copy .display-3 {
  margin: 0 0 0.9rem;
  color: var(--cinnabar-deep);
}

.page-about .channel-copy > p {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 44ch;
}

.page-about .region-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .region-cell {
  background: var(--indigo-pale);
  color: var(--indigo);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-align: center;
  padding: 0.85rem 0.25rem;
}

.page-about .channel-figure {
  margin: 0;
}

.page-about .channel-figure .img-frame {
  border: 1px solid var(--line);
}

.page-about .channel-figure figcaption {
  margin-top: 0.7rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--celadon);
}

/* ---------- CTA ---------- */

.page-about .about-cta__box {
  background: linear-gradient(135deg, var(--cinnabar-deep) 0%, var(--cinnabar) 100%);
  border-radius: var(--radius);
  padding: clamp(1.75rem, 5vw, 3.25rem);
  color: var(--rice);
}

.page-about .about-cta__box .display-3 {
  margin: 0.5rem 0 0.9rem;
  color: var(--rice);
}

.page-about .about-cta__box .lede {
  color: rgba(246, 241, 231, 0.86);
  max-width: 44ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-cta__box .btn--ghost {
  color: var(--rice);
  border-color: rgba(246, 241, 231, 0.55);
}

/* ---------- Responsive ---------- */

@media (min-width: 640px) {
  .page-about .cert-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .region-map {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .board__grid--split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

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

  .page-about .channel-wrap {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about .about-lines__figure {
    margin-top: 3.25rem;
  }

  .page-about .about-hero__media {
    margin-top: -1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .cert-card {
    transition: none;
  }
}