.page-about {
  --about-line: rgba(29, 142, 165, 0.35);
  --about-line-strong: rgba(29, 142, 165, 0.65);
  --about-grid: rgba(29, 142, 165, 0.12);
  background: var(--color-abyss);
  color: var(--color-frost);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: calc(var(--header-h) + 20px) var(--gutter) 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--color-steel);
}

.page-about .breadcrumb a {
  color: var(--color-steel);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .breadcrumb a:hover {
  color: var(--color-lime);
}

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

.page-about .about-hero {
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
  position: relative;
  background:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 56px 56px;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 64px);
  width: 100%;
}

.page-about .about-hero__rail {
  display: none;
}

.page-about .about-hero__content {
  max-width: 860px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 8vw, 84px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}

.page-about .about-hero__lead {
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.7;
  color: var(--color-frost);
  max-width: 56ch;
  margin: 0 0 16px;
}

.page-about .about-hero__trust {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-steel);
  max-width: 52ch;
  margin: 0 0 32px;
  padding-left: 16px;
  border-left: 2px solid var(--color-cyan);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  max-width: 480px;
  border: 1px solid var(--about-line);
  background: rgba(18, 42, 58, 0.45);
}

.page-about .about-hero__fact {
  padding: 18px 20px;
  border-right: 1px solid var(--about-line);
}

.page-about .about-hero__fact:last-child {
  border-right: 0;
}

.page-about .about-hero__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-lime);
  line-height: 1.2;
}

.page-about .about-hero__fact-label {
  display: block;
  font-size: 13px;
  color: var(--color-steel);
  margin-top: 6px;
}

.page-about .about-core,
.page-about .about-scale,
.page-about .about-timeline,
.page-about .about-team,
.page-about .about-next {
  padding-block: clamp(64px, 10vw, 120px);
}

.page-about .about-core__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-core__text h2,
.page-about .about-scale__header h2,
.page-about .about-timeline__header h2,
.page-about .about-team__header h2,
.page-about .about-next__header h2 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 12px 0 20px;
  color: var(--color-frost);
}

.page-about .about-core__text p:not(.eyebrow) {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-steel);
  max-width: 54ch;
  margin-bottom: 16px;
}

.page-about .about-core__media {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-core__schema {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--about-line);
  background: rgba(18, 42, 58, 0.5);
  padding: 24px 16px;
  position: relative;
}

.page-about .about-core__schema::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  border-left: 2px dashed var(--about-line);
}

.page-about .about-core__schema-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-inline: 14px;
}

.page-about .about-core__schema-head {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-lime);
  margin-bottom: 4px;
}

.page-about .about-core__schema-row {
  height: 8px;
  background: rgba(29, 142, 165, 0.45);
}

.page-about .about-core__schema-row:nth-child(2) {
  width: 100%;
}

.page-about .about-core__schema-row:nth-child(3) {
  width: 72%;
}

.page-about .about-core__schema-row:nth-child(4) {
  width: 88%;
}

.page-about .about-core__schema-col:last-child .about-core__schema-row {
  background: rgba(255, 106, 61, 0.45);
}

.page-about .about-core__proof {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .about-core__proof-item {
  border-top: 2px solid var(--about-line);
  padding-top: 14px;
}

.page-about .about-core__proof-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--color-orange);
  line-height: 1.1;
}

.page-about .about-core__proof-unit {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-steel);
  margin-left: 2px;
}

.page-about .about-core__proof-item p {
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.5;
  margin: 8px 0 0;
}

.page-about .about-scale {
  position: relative;
  background:
    radial-gradient(circle at 85% 15%, rgba(29, 142, 165, 0.18), transparent 42%),
    var(--color-navy);
}

.page-about .about-scale__header {
  max-width: 720px;
  margin-bottom: 40px;
}

.page-about .about-scale__intro {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-steel);
  max-width: 60ch;
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.page-about .about-scale__visual {
  margin: 0;
  position: relative;
}

.page-about .about-scale__chart {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--about-line);
  background: var(--color-abyss);
}

.page-about .about-scale__caption,
.page-about .about-timeline__caption,
.page-about .about-team__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-steel);
  letter-spacing: 0.06em;
  margin-top: 10px;
}

.page-about .about-scale__content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about .about-scale__panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-scale__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 20px;
  background: rgba(14, 26, 38, 0.55);
  border: 1px solid var(--about-line);
}

.page-about .about-scale__footer {
  font-size: 13px;
  color: var(--color-steel);
  line-height: 1.6;
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-timeline__header {
  max-width: 660px;
  margin-bottom: 40px;
}

.page-about .about-timeline__header p:not(.eyebrow) {
  font-size: 16px;
  color: var(--color-steel);
  line-height: 1.7;
}

.page-about .about-timeline__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

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

.page-about .about-timeline__img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--about-line);
  background: var(--color-navy);
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 28px;
  border-left: 2px solid var(--about-line);
  padding-bottom: 24px;
}

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

.page-about .timeline-item__dot {
  position: absolute;
  left: -9px;
  top: 8px;
  width: 16px;
  height: 16px;
  background: var(--color-abyss);
  border: 3px solid var(--color-orange);
  transform: rotate(45deg);
}

.page-about .timeline-item__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline-item__summary:hover .timeline-item__title {
  color: var(--color-lime);
}

.page-about .timeline-item__year {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-lime);
  line-height: 1.2;
  min-width: 52px;
}

.page-about .timeline-item__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-frost);
  line-height: 1.4;
  transition: color var(--transition);
}

.page-about .timeline-item__body {
  margin-top: 10px;
  max-width: 52ch;
  line-height: 1.7;
  color: var(--color-steel);
  font-size: 15px;
  border-left: 2px solid var(--about-line-strong);
  padding-left: 16px;
}

.page-about .about-team {
  background:
    linear-gradient(180deg, rgba(14, 26, 38, 0.4), transparent 40%),
    var(--color-carbon);
}

.page-about .about-team__header {
  max-width: 700px;
  margin-bottom: 40px;
}

.page-about .about-team__header p:not(.eyebrow) {
  font-size: 16px;
  color: var(--color-steel);
  line-height: 1.7;
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 32px;
}

.page-about .about-team__chart {
  margin: 0 0 40px;
}

.page-about .about-team__chart-img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  background: var(--color-navy);
  border: 1px solid var(--about-line);
}

.page-about .about-team__ecosystem {
  border: 1px solid var(--about-line);
  padding: 20px 24px;
  margin-bottom: 40px;
  background: rgba(18, 42, 58, 0.35);
}

.page-about .about-team__ecosystem-title,
.page-about .about-team__cert-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-lime);
  margin: 0 0 12px;
}

.page-about .about-team__ecosystem-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-team__ecosystem-list li {
  color: var(--color-steel);
  font-size: 15px;
  line-height: 1.6;
  position: relative;
  padding-left: 20px;
}

.page-about .about-team__ecosystem-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--color-cyan);
  transform: rotate(45deg);
}

.page-about .about-team__certs {
  margin-top: 24px;
}

.page-about .about-team__cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .cert-card {
  background: rgba(18, 42, 58, 0.6);
  border: 1px solid var(--about-line);
  transition: border-color var(--transition);
}

.page-about .cert-card[open] {
  border-color: var(--about-line-strong);
}

.page-about .cert-card__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .cert-card__icon {
  color: var(--color-cyan);
  flex-shrink: 0;
  transition: color var(--transition);
}

.page-about .cert-card:hover .cert-card__icon {
  color: var(--color-valid);
}

.page-about .cert-card__label {
  flex: 1;
  font-weight: 700;
  font-size: 15px;
  color: var(--color-frost);
  line-height: 1.4;
}

.page-about .cert-card__arrow {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-lime);
  transition: transform var(--transition);
}

.page-about .cert-card[open] .cert-card__arrow {
  transform: rotate(45deg);
}

.page-about .cert-card__detail {
  padding: 0 18px 16px;
  margin: 0;
  font-size: 14px;
  color: var(--color-steel);
  line-height: 1.6;
  border-top: 1px solid var(--about-line);
  padding-top: 12px;
}

.page-about .about-next {
  background:
    linear-gradient(180deg, var(--color-abyss), transparent 180px),
    var(--color-carbon);
}

.page-about .about-next__header {
  margin-bottom: 32px;
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "title arrow"
    "desc desc";
  gap: 4px 16px;
  padding: 20px 24px;
  background: rgba(18, 42, 58, 0.5);
  border: 1px solid var(--about-line);
  color: var(--color-frost);
  text-decoration: none;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.page-about .about-next__link:hover {
  transform: translateY(-4px);
  border-color: var(--color-cyan);
  background: rgba(18, 42, 58, 0.8);
}

.page-about .about-next__link-title {
  grid-area: title;
  font-weight: 700;
  font-size: 18px;
  color: var(--color-frost);
}

.page-about .about-next__link-desc {
  grid-area: desc;
  font-size: 14px;
  color: var(--color-steel);
  line-height: 1.5;
}

.page-about .about-next__link-arrow {
  grid-area: arrow;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--color-lime);
  transition: transform var(--transition);
}

.page-about .about-next__link:hover .about-next__link-arrow {
  transform: translateX(6px);
}

@media (min-width: 768px) {
  .page-about .about-hero__inner {
    grid-template-columns: 64px 1fr;
  }

  .page-about .about-hero__rail {
    display: block;
    position: relative;
    min-height: 360px;
    border-left: 2px solid var(--about-line);
  }

  .page-about .about-hero__rail-dot {
    position: absolute;
    left: -8px;
    width: 14px;
    height: 14px;
    background: var(--color-abyss);
    border: 2px solid var(--color-cyan);
    transform: rotate(45deg);
  }

  .page-about .about-hero__rail-dot:nth-child(1) {
    top: 0;
  }

  .page-about .about-hero__rail-dot:nth-child(2) {
    top: 50%;
  }

  .page-about .about-hero__rail-dot:nth-child(3) {
    bottom: 0;
  }

  .page-about .about-hero__rail-dot--active {
    background: var(--color-orange);
    border-color: var(--color-orange);
  }

  .page-about .about-core__grid {
    grid-template-columns: 6fr 5fr;
    gap: clamp(32px, 6vw, 80px);
    align-items: start;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(280px, 5fr) 7fr;
    gap: clamp(32px, 5vw, 72px);
    align-items: center;
  }

  .page-about .about-scale__panels {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: minmax(260px, 5fr) 7fr;
    gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-timeline__visual {
    position: sticky;
    top: calc(var(--header-h) + 40px);
  }

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

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

  .page-about .about-team__ecosystem-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

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

@media (min-width: 1024px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-scale__panel {
    padding: 24px;
  }
}