.page-about {
  --about-title: clamp(3rem, 8vw, 6.4rem);
  --about-kicker: clamp(1rem, 2vw, 1.35rem);
  background: var(--color-bg);
  color: var(--color-text);
}

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  min-height: 100vh;
  padding: calc(var(--header-h) + 4rem) 0 4rem;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(11, 15, 26, 0.85) 0%, var(--color-bg) 90%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.035) 0 1px, transparent 1px 72px),
    radial-gradient(circle at 72% 30%, rgba(0, 212, 255, 0.08), transparent 36%);
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  right: -6%;
  bottom: -4%;
  width: 46%;
  height: 58%;
  z-index: -1;
  background: linear-gradient(135deg, rgba(0, 255, 135, 0.12), rgba(0, 212, 255, 0.05));
  clip-path: polygon(22% 0, 100% 10%, 88% 100%, 0 88%);
}

@media (max-width: 767px) {
  .page-about .about-hero::after {
    opacity: 0.4;
  }
}

.page-about .about-hero__inner {
  width: 100%;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2.5rem;
  margin-top: clamp(2.5rem, 5vh, 4rem);
}

@media (min-width: 992px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: end;
    gap: 4rem;
  }
}

.page-about .about-hero__index {
  margin: 0 0 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-electric-blue);
}

.page-about .about-hero__title {
  margin: 0 0 2rem;
  font-family: var(--font-heading);
  font-weight: 100;
  line-height: 1.02;
  letter-spacing: -0.03em;
  font-size: var(--about-title);
}

.page-about .about-hero__kicker {
  display: block;
  margin-bottom: 1.5rem;
  font-size: var(--about-kicker);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

.page-about .about-hero__line1,
.page-about .about-hero__line2 {
  display: block;
}

.page-about .about-hero__line2 {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lead {
  max-width: 46rem;
  margin: 0;
  padding-left: 1.25rem;
  border-left: 2px solid var(--color-line);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
}

.page-about .about-hero__aside {
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.page-about .about-hero__aside-label {
  margin: 0 0 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.page-about .about-hero__chapters {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.page-about .about-hero__chapters li {
  margin: 0;
}

.page-about .about-hero__chapters a {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-md);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .about-hero__chapters a:hover {
  background: rgba(255, 255, 255, 0.06);
  transform: translateX(5px);
}

.page-about .about-hero__chapters span {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-neon-green);
}

.page-about .about-origin__grid {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 1024px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 4rem;
  }
}

.page-about .about-origin__prose {
  color: var(--color-text-secondary);
  line-height: 1.85;
}

.page-about .about-origin__prose > p:first-child {
  margin-top: 0;
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--color-text);
}

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

.page-about .about-origin__pillars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-origin__pillars .card {
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-origin__pillars .card:hover {
  transform: translateY(-4px);
  border-color: var(--color-electric-blue);
}

.page-about .about-origin__num {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--color-neon-green);
}

.page-about .about-origin__pillars h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.page-about .about-origin__pillars p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.925rem;
  line-height: 1.7;
}

.page-about .about-milestones__layout {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .page-about .about-milestones__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 4rem;
  }
}

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

.page-about .about-milestones__timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--color-neon-green) 0%, var(--color-electric-blue) 55%, var(--color-line) 100%);
}

.page-about .about-milestones__item {
  position: relative;
  padding-left: 2.75rem;
  margin-bottom: 1.25rem;
}

.page-about .about-milestones__node {
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-neon-green);
  box-shadow: 0 0 0 3px rgba(0, 255, 135, 0.14);
}

.page-about .about-milestones__details summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
  padding: 1.15rem 1.25rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

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

.page-about .about-milestones__details summary:hover {
  background: rgba(0, 255, 135, 0.05);
  border-color: var(--color-neon-green);
}

.page-about .about-milestones__year {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-neon-green);
}

.page-about .about-milestones__title {
  font-weight: 600;
  color: var(--color-text);
}

.page-about .about-milestones__toggle {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--color-electric-blue);
  transition: transform 0.3s var(--ease);
}

.page-about .about-milestones__details[open] .about-milestones__toggle {
  transform: rotate(45deg);
}

.page-about .about-milestones__body {
  padding: 1.1rem 1.25rem 0.4rem;
}

.page-about .about-milestones__body p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-about .about-milestones__media,
.page-about .about-data__media,
.page-about .about-security__media {
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .about-milestones__media figcaption {
  padding: 0.85rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-line);
}

.page-about .about-data__layout {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 1024px) {
  .page-about .about-data__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 4rem;
    align-items: stretch;
  }
}

.page-about .about-data__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

@media (max-width: 480px) {
  .page-about .about-data__cards {
    grid-template-columns: 1fr;
  }
}

.page-about .about-data__card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 168px;
  padding: 1.4rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-data__card:hover,
.page-about .about-data__card:focus-within {
  border-color: var(--color-neon-green);
  background: rgba(0, 255, 135, 0.05);
  transform: translateY(-4px);
}

.page-about .about-data__card::after {
  content: attr(data-hover);
  position: absolute;
  left: 1.1rem;
  right: 1.1rem;
  bottom: 0.85rem;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-data__card:hover::after,
.page-about .about-data__card:focus-within::after {
  opacity: 1;
  transform: translateY(0);
}

.page-about .about-data__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.page-about .about-data__value {
  margin: 0.6rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-data__note {
  margin: 1rem 0 0;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  transition: opacity 0.3s var(--ease);
}

.page-about .about-data__card:hover .about-data__note {
  opacity: 0;
}

.page-about .about-data__media {
  display: flex;
  flex-direction: column;
}

.page-about .about-data__media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

.page-about .about-data__media figcaption {
  padding: 0.85rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-line);
}

.page-about .about-data__bottom {
  margin-top: clamp(1.5rem, 4vw, 3rem);
  padding: 1.5rem 1.5rem 1.5rem 1.75rem;
  background: var(--color-surface);
  border-left: 3px solid var(--color-electric-blue);
  border-radius: var(--radius-md);
}

.page-about .about-data__bottom p {
  margin: 0;
  max-width: 62rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.page-about .about-security__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .page-about .about-security__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 4rem;
  }
}

.page-about .about-security__text {
  color: var(--color-text-secondary);
  line-height: 1.85;
}

.page-about .about-security__text > p:first-child {
  margin-top: 0;
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--color-text);
}

.page-about .about-security__metrics {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-line);
  display: grid;
  gap: 1rem;
}

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

.page-about .about-security__media figcaption {
  padding: 0.85rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-line);
}

.page-about .about-next {
  margin-top: clamp(1rem, 3vw, 2rem);
  padding-top: clamp(2rem, 5vw, 4rem);
  border-top: 1px solid var(--color-line);
}

.page-about .about-next__head {
  margin: 0 0 1.5rem;
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 300;
  letter-spacing: -0.02em;
}

.page-about .about-next__list {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 768px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-next__item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1.25rem 1.4rem;
  background: var(--color-glass);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-next__item:hover {
  background: rgba(0, 212, 255, 0.06);
  border-color: var(--color-electric-blue);
  transform: translateY(-2px);
}

.page-about .about-next__num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-neon-green);
}

.page-about .about-next__label {
  font-weight: 600;
  white-space: nowrap;
}

.page-about .about-next__desc {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  text-align: right;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}