.page-about {
  --about-neon-rgb: 183, 255, 0;
  --about-solar-rgb: 255, 138, 0;
  background:
    linear-gradient(90deg, rgba(18, 59, 92, 0.07) 1px, transparent 1px) 0 0 / 64px 64px,
    var(--color-bg);
}

.page-about .breadcrumbs {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 0;
}

.page-about .breadcrumbs__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--color-line);
}

.page-about .breadcrumbs__link {
  color: var(--color-link);
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover {
  color: var(--color-accent);
}

.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--color-muted);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 3.5rem 1.25rem 2.5rem;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -60px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(var(--about-neon-rgb), 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
}

.page-about .about-hero__kicker {
  font-family: var(--font-num);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-accent);
  display: inline-block;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--color-heading);
  margin: 0 0 1.25rem;
  max-width: 15em;
}

.page-about .about-hero__lead {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-body);
  max-width: 42em;
  margin: 0 0 1.5rem;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__meta-item {
  font-family: var(--font-num);
  font-size: 0.8rem;
  color: var(--color-heading);
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
}

.page-about .about-hero__index {
  background: var(--color-card);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex-shrink: 0;
}

.page-about .about-hero__index-label {
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.page-about .about-hero__index a {
  color: var(--color-link);
  text-decoration: none;
  font-size: 0.92rem;
  padding: 0.2rem 0;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.page-about .about-hero__index a:hover {
  color: var(--color-accent);
  padding-left: 0.35rem;
}

.page-about .about-hero__yearline {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  font-family: var(--font-num);
  color: var(--color-muted);
  font-size: 1rem;
}

.page-about .about-hero__yearline i {
  flex: 1;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--color-line) 0 6px, transparent 6px 12px);
}

.page-about .about-hero__yearline span:first-child {
  color: var(--color-accent);
  font-size: 1.3rem;
}

.page-about .about-hero__yearline span:last-child {
  color: var(--color-heading);
  font-size: 1.3rem;
}

.page-about .section__kicker {
  font-family: var(--font-num);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin: 0 0 0.85rem;
}

.page-about .section__heading {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--color-heading);
  margin: 0 0 1rem;
}

.page-about .section__lead {
  color: var(--color-body);
  font-size: 1rem;
  line-height: 1.8;
  margin: 0 0 2rem;
  max-width: 46em;
}

.page-about .about-summary {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.page-about .about-summary__head {
  margin-bottom: 1.5rem;
}

.page-about .about-summary__body p {
  color: var(--color-body);
  line-height: 1.85;
  margin: 0 0 1rem;
  font-size: 0.98rem;
}

.page-about .about-summary__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}

.page-about .about-stat {
  position: relative;
  background: linear-gradient(160deg, var(--color-card) 0%, rgba(12, 42, 69, 0.55) 100%);
  border-radius: var(--radius-card);
  padding: 1.4rem 1.2rem 1.2rem;
  border-bottom: 3px solid var(--color-line);
  transition: border-color 0.25s ease, transform 0.25s ease;
  overflow: hidden;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, transparent 50%, rgba(183, 255, 0, 0.1) 50%, rgba(183, 255, 0, 0.1) 56%, transparent 56%);
}

.page-about .about-stat:hover {
  border-bottom-color: var(--color-accent);
  transform: translateY(-3px);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-heading);
  letter-spacing: -0.02em;
}

.page-about .about-stat:last-child .about-stat__num {
  color: var(--color-solar);
}

.page-about .about-stat__unit {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-body);
  margin-top: 0.3rem;
}

.page-about .about-stat__note {
  display: block;
  font-size: 0.78rem;
  color: var(--color-muted);
  margin-top: 0.45rem;
}

.page-about .about-timeline {
  background:
    linear-gradient(rgba(7, 27, 47, 0.92), rgba(7, 27, 47, 0.92)),
    repeating-linear-gradient(0deg, var(--color-line) 0 1px, transparent 1px 48px);
}

.page-about .about-timeline__head {
  margin-bottom: 2rem;
}

.page-about .about-timeline__chart {
  margin: 0 0 2rem;
}

.page-about .about-timeline__chart img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-line);
}

.page-about .about-timeline__chart figcaption {
  font-family: var(--font-num);
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 0.6rem;
  text-align: right;
}

.page-about .about-timeline__filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.page-about .about-timeline__filter {
  font-family: var(--font-num);
  font-size: 0.85rem;
  color: var(--color-body);
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-timeline__filter:hover,
.page-about .about-timeline__filter[aria-pressed="true"] {
  color: var(--color-bg);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.page-about .about-timeline__axis {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-about .about-milestone {
  position: relative;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 0.75rem 1rem;
  padding-left: 1.5rem;
  border-left: 2px solid var(--color-line);
  margin-left: 0.25rem;
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 0.35rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(183, 255, 0, 0.15);
}

.page-about .about-milestone__year {
  font-family: var(--font-num);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.page-about .about-milestone__card {
  background: var(--color-card);
  border-radius: var(--radius-card);
  padding: 1.1rem 1.2rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  border-left: 3px solid transparent;
}

.page-about .about-milestone__card:hover {
  transform: translateX(4px);
  border-left-color: var(--color-accent);
  box-shadow: var(--shadow);
}

.page-about .about-milestone__card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--color-heading);
  margin: 0 0 0.5rem;
}

.page-about .about-milestone__card p {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--color-body);
  margin: 0;
}

.page-about .about-engine {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.page-about .about-engine__head {
  margin-bottom: 2rem;
}

.page-about .about-engine__grid {
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

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

.page-about .about-engine__chart img {
  width: 100%;
  max-width: 340px;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 50%;
  border: 2px solid var(--color-line);
  background: var(--color-card);
}

.page-about .about-engine__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about .about-engine__item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.1rem 1.2rem;
  background: var(--color-card);
  border-radius: var(--radius-card);
  border-left: 3px solid var(--color-line);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-engine__item:hover {
  border-left-color: var(--color-accent);
  background: #0F3353;
}

.page-about .about-engine__item-num {
  font-family: var(--font-num);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(183, 255, 0, 0.1);
  border-radius: 4px;
  padding: 0.3rem 0.5rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.page-about .about-engine__item-body h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  line-height: 1.3;
  color: var(--color-heading);
  margin: 0 0 0.4rem;
}

.page-about .about-engine__item-body p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-body);
  margin: 0;
}

.page-about .about-engine__foot {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2.5rem;
  padding: 1.5rem;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-line);
  background: linear-gradient(165deg, rgba(7, 27, 47, 0.6), rgba(12, 42, 69, 0.5));
}

.page-about .about-engine__foot-intro h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--color-heading);
  margin: 0 0 0.5rem;
}

.page-about .about-engine__foot-intro p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-body);
  margin: 0;
}

.page-about .about-engine__foot-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.page-about .about-engine__foot-item {
  background: rgba(117, 211, 245, 0.08);
  border: 1px solid rgba(117, 211, 245, 0.2);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .about-engine__foot-label {
  font-family: var(--font-num);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.page-about .about-engine__foot-value {
  font-family: var(--font-num);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-link);
}

.page-about .about-boundary {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.page-about .about-boundary__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-boundary__list {
  margin: 1.75rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about .about-boundary__row {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  background: var(--color-card);
  border-radius: 8px;
}

.page-about .about-boundary__row dt {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.page-about .about-boundary__row dd {
  font-family: var(--font-num);
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-heading);
  margin: 0;
  overflow-wrap: anywhere;
}

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

.page-about .about-boundary__visual img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-line);
}

.page-about .about-boundary__visual figcaption {
  font-family: var(--font-num);
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
  text-align: left;
}

.page-about .about-further {
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.page-about .about-further__head {
  margin-bottom: 2rem;
}

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

.page-about .about-further__card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  background: linear-gradient(165deg, var(--color-card), rgba(12, 42, 69, 0.45));
  border-radius: var(--radius-card);
  padding: 1.5rem 1.4rem;
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-further__card:hover {
  transform: translateY(-4px);
  border-bottom-color: var(--color-accent);
  box-shadow: var(--shadow);
}

.page-about .about-further__card-num {
  font-family: var(--font-num);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(183, 255, 0, 0.12);
  border-radius: 4px;
  padding: 0.3rem 0.55rem;
}

.page-about .about-further__card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-heading);
  margin: 0.25rem 0 0;
}

.page-about .about-further__card p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-body);
  margin: 0 0 0.5rem;
}

.page-about .about-further__card .card__link {
  color: var(--color-link);
  font-family: var(--font-num);
  font-size: 0.82rem;
  text-decoration: none;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 4.5rem;
  }

  .page-about .about-hero__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 3rem;
  }

  .page-about .about-hero__main {
    flex: 1 1 auto;
  }

  .page-about .about-hero__index {
    flex: 0 0 240px;
    margin-top: 2rem;
  }

  .page-about .about-hero__yearline {
    margin-top: 4rem;
  }

  .page-about .about-summary__head {
    display: flex;
    align-items: baseline;
    gap: 2rem;
  }

  .page-about .about-summary__head .section__heading {
    margin-bottom: 0;
  }

  .page-about .about-summary__body p:first-child {
    max-width: 52em;
  }

  .page-about .about-summary__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-milestone {
    grid-template-columns: 110px 1fr;
    gap: 2rem;
  }

  .page-about .about-milestone__card {
    padding: 1.5rem 1.75rem;
    max-width: 780px;
  }

  .page-about .about-milestone__card h3 {
    font-size: 1.2rem;
  }

  .page-about .about-milestone__card p {
    font-size: 0.95rem;
  }

  .page-about .about-engine__grid {
    flex-direction: row;
    align-items: center;
    gap: 4rem;
  }

  .page-about .about-engine__visual {
    flex: 0 0 38%;
  }

  .page-about .about-engine__chart img {
    max-width: 360px;
    margin-left: 0;
  }

  .page-about .about-engine__list {
    flex: 1 1 auto;
  }

  .page-about .about-engine__foot {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-engine__foot-intro {
    flex: 0 0 45%;
  }

  .page-about .about-engine__foot-metrics {
    flex: 1 1 auto;
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-boundary__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
  }

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