.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  background: var(--color-primary-base);
  color: var(--color-text-hi);
  font-family: var(--font-body);
  line-height: 1.8;
}

.page-about .fig img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about a {
  color: var(--color-text-hi);
  text-decoration: underline;
  text-decoration-color: rgba(57, 255, 20, 0.45);
  text-underline-offset: 0.2em;
  transition: color 0.25s var(--ease), text-decoration-color 0.25s var(--ease);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--color-accent-neon);
  text-decoration-color: var(--color-accent-neon);
}

.page-about .breadcrumb {
  margin-bottom: var(--space-4);
  color: var(--color-text-mid);
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0;
  margin: 0;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-2);
  color: var(--color-text-low);
}

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

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

.page-about-hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-5) 0 var(--space-7);
}

.page-about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 31, 68, 0.98), rgba(29, 58, 106, 0.72) 45%, rgba(255, 107, 53, 0.08));
  z-index: 0;
}

.page-about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 18%;
  width: 42%;
  height: 38%;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), transparent 62%);
  clip-path: polygon(36% 0, 100% 0, 100% 62%);
  z-index: 0;
}

.page-about-hero__container {
  position: relative;
  z-index: 1;
}

.page-about-hero__grid {
  display: grid;
  gap: var(--space-6);
  align-items: center;
  padding-top: var(--space-5);
}

.page-about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-4);
}

.page-about-hero__eyebrow-text {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-mid);
  letter-spacing: 0.06em;
}

.page-about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.2rem, 7vw, 4.3rem);
  line-height: 0.98;
  letter-spacing: 0.015em;
  margin: var(--space-4) 0;
}

.page-about-hero__lead {
  font-size: 1rem;
  color: var(--color-text-mid);
  max-width: 42em;
}

.page-about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.page-about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin: var(--space-5) 0 0;
  padding: 0;
}

.page-about-hero__stats div {
  background: rgba(10, 31, 68, 0.68);
  border: 1px solid rgba(57, 255, 20, 0.18);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
}

.page-about-hero__stats dt {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-text-mid);
  letter-spacing: 0.08em;
}

.page-about-hero__stats dd {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-accent-neon);
  margin: 0.25rem 0 0;
}

.page-about-hero__media img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid rgba(57, 255, 20, 0.25);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.page-about-section-heading {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  position: relative;
}

.page-about-section-heading__index {
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 7rem);
  line-height: 0.8;
  color: rgba(57, 255, 20, 0.16);
  display: block;
}

.page-about-section-heading h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  line-height: 1.05;
  margin: 0;
  letter-spacing: 0.02em;
}

.page-about-section-heading p {
  color: var(--color-text-mid);
  max-width: 40em;
  margin: var(--space-1) 0 0;
}

.page-about-section-heading--light .page-about-section-heading__index {
  color: rgba(255, 107, 53, 0.22);
}

.page-about-role__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about-role__copy p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-mid);
}

.page-about-role__copy .link-inline {
  display: inline-block;
  margin-top: var(--space-2);
  color: var(--color-accent-sky);
  font-weight: 700;
}

.page-about-role__engines {
  display: grid;
  gap: var(--space-4);
}

.page-about-engine {
  background: var(--color-primary-elevated);
  border-left: 4px solid var(--color-accent-neon);
  padding: var(--space-5);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  position: relative;
  overflow: hidden;
}

.page-about-engine::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, transparent 45%, rgba(57, 255, 20, 0.08) 45%);
}

.page-about-engine h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.page-about-engine p {
  margin: 0;
  color: var(--color-text-mid);
}

.page-about-engine--data {
  border-left-color: var(--color-accent-ember);
}

.page-about-engine--data::before {
  background: linear-gradient(135deg, transparent 45%, rgba(255, 107, 53, 0.08) 45%);
}

.page-about-engine--service {
  border-left-color: var(--color-accent-sky);
}

.page-about-engine--service::before {
  background: linear-gradient(135deg, transparent 45%, rgba(45, 156, 219, 0.08) 45%);
}

.page-about-milestones__wrap {
  position: relative;
}

.page-about-milestones__svg {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.page-about-milestones__list {
  position: relative;
  display: grid;
  gap: var(--space-5);
  padding-top: var(--space-2);
}

.page-about-milestones__list::before {
  content: "";
  position: absolute;
  left: 1.55rem;
  top: 1.8rem;
  bottom: 1.8rem;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent-neon), var(--color-accent-ember), var(--color-accent-sky));
  opacity: 0.35;
}

.page-about-milestone {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-3);
  align-items: start;
  margin-left: 1.25rem;
  background: rgba(18, 42, 74, 0.82);
  border: 1px solid rgba(45, 156, 219, 0.18);
  padding: var(--space-4);
  border-radius: var(--radius-md);
}

.page-about-milestone__marker {
  font-family: var(--font-display);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--color-accent-ember);
}

.page-about-milestone__body h3 {
  margin: 0 0 0.25rem;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.page-about-milestone__body p {
  margin: 0;
  color: var(--color-text-mid);
  font-size: 0.95rem;
}

.page-about-milestones__media {
  margin-top: var(--space-6);
}

.page-about-milestones__media img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid rgba(45, 156, 219, 0.22);
}

.page-about .paper {
  background: rgba(245, 247, 250, 0.045);
  border: 1px solid rgba(245, 247, 250, 0.1);
  box-shadow: 0 1px 0 rgba(245, 247, 250, 0.06), 0 12px 28px rgba(0, 0, 0, 0.22);
}

.page-about-credentials__grid {
  display: grid;
  gap: var(--space-5);
}

.page-about-credential {
  position: relative;
  padding: var(--space-6);
  margin-bottom: var(--space-2);
}

.page-about-credential__seal {
  position: absolute;
  top: -0.8rem;
  right: 1rem;
  width: 3.4rem;
  height: 3.4rem;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--color-accent-ember);
  border: 2px solid var(--color-accent-ember);
  background: var(--color-primary-base);
  transform: rotate(4deg);
}

.page-about-credential h3 {
  margin: 0 0 var(--space-2);
  padding-right: 3rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
}

.page-about-credential p {
  margin: 0;
  color: var(--color-text-mid);
}

.page-about-credential__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px dashed rgba(57, 255, 20, 0.22);
}

.page-about-credential__no {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-low);
}

.page-about-credentials__media {
  margin-top: var(--space-6);
}

.page-about-credentials__media img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 107, 53, 0.2);
}

.page-about-credentials__footnote {
  margin-top: var(--space-4);
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-low);
}

.page-about-ecosystem__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about-eco {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0 var(--space-3);
  padding: var(--space-5);
  background: linear-gradient(135deg, rgba(18, 42, 74, 0.9), rgba(57, 255, 20, 0.05));
  border: 1px solid rgba(57, 255, 20, 0.2);
  border-radius: var(--radius-md);
}

.page-about-eco__label {
  grid-column: 1 / -1;
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--color-text-mid);
}

.page-about-eco__num {
  font-family: var(--font-display);
  font-size: 3.4rem;
  line-height: 0.9;
  color: var(--color-accent-neon);
}

.page-about-eco__unit {
  align-self: end;
  color: var(--color-text-mid);
}

.page-about-eco p {
  grid-column: 1 / -1;
  margin: var(--space-3) 0 0;
  color: var(--color-text-mid);
}

.page-about-eco--ember {
  background: linear-gradient(135deg, rgba(18, 42, 74, 0.9), rgba(255, 107, 53, 0.06));
  border-color: rgba(255, 107, 53, 0.24);
}

.page-about-eco--ember .page-about-eco__num {
  color: var(--color-accent-ember);
}

.page-about-eco--sky {
  background: linear-gradient(135deg, rgba(18, 42, 74, 0.9), rgba(45, 156, 219, 0.08));
  border-color: rgba(45, 156, 219, 0.25);
}

.page-about-eco--sky .page-about-eco__num {
  color: var(--color-accent-sky);
}

.page-about-ecosystem__note {
  margin-top: var(--space-5);
  font-size: 0.9rem;
  color: var(--color-text-low);
}

.page-about-catalog__layout {
  display: grid;
  gap: var(--space-6);
}

.page-about-catalog__tree {
  display: grid;
  gap: var(--space-3);
}

.page-about-tree-node {
  background: var(--color-primary-elevated);
  border: 1px solid rgba(45, 156, 219, 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about-tree-node summary {
  display: grid;
  grid-template-columns: 2.8rem 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  cursor: pointer;
  list-style: none;
  transition: background 0.25s var(--ease);
}

.page-about-tree-node summary::-webkit-details-marker {
  display: none;
}

.page-about-tree-node summary:hover {
  background: rgba(45, 156, 219, 0.08);
}

.page-about-tree-node[open] summary {
  border-bottom: 1px solid rgba(45, 156, 219, 0.15);
}

.page-about-tree-node__index {
  font-family: var(--font-display);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--color-accent-ember);
}

.page-about-tree-node__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.page-about-tree-node__count {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-mid);
  background: rgba(57, 255, 20, 0.08);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.page-about-tree-node__list {
  list-style: none;
  margin: 0;
  padding: var(--space-4) var(--space-4) var(--space-5) calc(2.8rem + 1.5rem);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-2);
}

.page-about-tree-node__list li {
  position: relative;
  padding-left: 0.75rem;
  color: var(--color-text-mid);
  font-size: 0.92rem;
  line-height: 1.6;
}

.page-about-tree-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  background: var(--color-accent-neon);
  transform: rotate(45deg);
}

.page-about-catalog__aside .card {
  border: 1px solid rgba(255, 107, 53, 0.25);
  background: linear-gradient(135deg, rgba(18, 42, 74, 0.95), rgba(10, 31, 68, 0.75));
  padding: var(--space-5);
}

.page-about-catalog__aside h3 {
  margin-top: 0;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.page-about-catalog__aside ol {
  list-style: none;
  counter-reset: step;
  margin: var(--space-4) 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about-catalog__aside li {
  counter-increment: step;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-mid);
}

.page-about-catalog__aside li::before {
  content: counter(step, decimal-leading-zero);
  flex: 0 0 2rem;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  font-family: var(--font-data);
  color: var(--color-accent-neon);
  background: rgba(57, 255, 20, 0.08);
  border-radius: var(--radius-sm);
}

.page-about-catalog__aside p {
  color: var(--color-text-mid);
  font-size: 0.95rem;
}

.page-about-more__card {
  border: 1px solid rgba(57, 255, 20, 0.24);
  background: linear-gradient(120deg, rgba(29, 58, 106, 0.7), rgba(10, 31, 68, 0.9));
  padding: var(--space-6);
  border-radius: var(--radius-md);
}

.page-about-more__card h2 {
  margin-top: 0;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.page-about-more__card p {
  color: var(--color-text-mid);
}

.page-about-more__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

@media (min-width: 720px) {
  .page-about-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--space-7);
  }

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

  .page-about-role__grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: start;
  }

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

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

  .page-about-catalog__layout {
    grid-template-columns: 1fr 0.72fr;
    align-items: start;
  }

  .page-about-catalog__aside {
    position: sticky;
    top: calc(var(--header-height) + var(--space-4));
  }

  .page-about-more__card {
    padding: var(--space-7);
  }
}

@media (min-width: 1024px) {
  .page-about-hero {
    padding-top: var(--space-7);
    padding-bottom: var(--space-9);
  }

  .page-about-hero__copy h1 {
    font-size: clamp(3.2rem, 5.2vw, 4.8rem);
  }

  .page-about-hero__lead {
    font-size: 1.08rem;
  }

  .page-about-milestones__list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }

  .page-about-milestones__list::before {
    display: none;
  }

  .page-about-milestones__svg {
    display: block;
    opacity: 0.65;
  }

  .page-about-milestones__media {
    grid-column: 1 / -1;
    max-width: 780px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about-credentials__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }

  .page-about-credentials__media {
    margin-top: var(--space-7);
  }

  .page-about-ecosystem {
    padding-top: var(--space-9);
    padding-bottom: var(--space-9);
  }
}