.page-about {
  --about-sidebar-w: 224px;
  --about-article-w: 880px;
  --about-gap: 56px;
  padding: 48px 0 96px;
  color: var(--text);
  background:
    radial-gradient(circle at 82% 8%, rgba(0, 240, 255, 0.08), transparent 260px),
    linear-gradient(180deg, var(--bg-deep) 0%, rgba(11, 15, 26, 0.96) 100%);
}

.page-about .breadcrumbs {
  margin-bottom: 28px;
}

.page-about .section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .section-label::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 32px;
  padding: 48px 0 24px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 54%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.14), rgba(255, 102, 0, 0.05));
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero-main,
.page-about .about-hero-meta {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  margin: 8px 0 24px;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 5.4rem);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .about-hero-subtitle {
  display: block;
  margin-top: 18px;
  font-size: 0.42em;
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-about .about-hero-desc {
  max-width: 42rem;
  margin: 0 0 24px;
  color: var(--text-dim);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.8;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 16px 0 8px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero-meta-num {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1;
  color: var(--text);
}

.page-about .about-hero-meta-name {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .about-hero-curve {
  grid-column: 1 / -1;
  display: block;
  width: 100%;
  height: 64px;
  margin-top: 8px;
}

.page-about .about-hero-curve path {
  fill: none;
  stroke-width: 1.5;
}

.page-about .about-hero-curve .about-hero-curve-line {
  stroke: rgba(0, 240, 255, 0.3);
}

.page-about .about-hero-curve .about-hero-curve-dash {
  stroke: var(--orange);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-top: 48px;
}

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

.page-about .about-articles {
  min-width: 0;
}

.page-about .about-section {
  margin-bottom: 84px;
  scroll-margin-top: calc(var(--header-sticky-h) + 16px);
}

.page-about .about-section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section-index {
  font-family: var(--font-display);
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-about .about-section-desc {
  max-width: 38rem;
  margin: -8px 0 24px;
  color: var(--text-dim);
  line-height: 1.8;
}

.page-about .about-section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-main-copy p {
  margin: 0 0 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-main-copy a,
.page-about .about-team-copy a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.page-about .about-narrow-note {
  padding: 20px;
  background: var(--bg-raised);
  border-left: 2px solid var(--cyan);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);
}

.page-about .about-narrow-note p:first-child {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.page-about .about-narrow-note blockquote {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-narrow-note .text-muted {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
}

.page-about .about-timeline-figure {
  margin: 0 0 44px;
}

.page-about .about-timeline-figure img,
.page-about .about-principles-figure img,
.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--bg-raised);
}

.page-about figure figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--line) 55%, var(--orange));
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 36px 28px;
}

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

.page-about .about-timeline-marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 240, 255, 0.08);
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-timeline-item:hover .about-timeline-marker {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 102, 0, 0.08);
}

.page-about .about-timeline-year {
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-timeline-body h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text);
}

.page-about .about-timeline-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-milestones-link {
  padding-left: 28px;
}

.page-about .about-principles-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line);
}

.page-about .about-principle {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-principle-num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  color: var(--orange);
}

.page-about .about-principle h3 {
  margin: 0 0 10px;
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-principles-bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 42px;
}

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

.page-about .about-principles-note p {
  margin: 12px 0 20px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-team-copy p {
  margin: 0 0 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-team-copy ul {
  display: grid;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team-copy li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-team-copy li strong {
  margin-right: 8px;
  font-weight: 500;
  color: var(--cyan);
}

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

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

.page-about .about-scenario {
  position: relative;
  padding: 22px 0 22px 48px;
  border-top: 1px solid var(--line);
}

.page-about .about-scenario:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-scenario-num {
  position: absolute;
  left: 0;
  top: 24px;
  width: 32px;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  color: var(--orange);
}

.page-about .about-scenario h3 {
  margin: 0 0 8px;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text);
}

.page-about .about-scenario p {
  margin: 0;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-scenarios-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .back-to-top {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 60;
  text-decoration: none;
}

@media (min-width: 768px) {
  .page-about .about-section-grid {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .about-timeline-year {
    margin-bottom: 0;
    line-height: 1.4;
  }

  .page-about .about-principles-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }

  .page-about .about-principle:nth-child(odd) {
    padding-right: 24px;
  }

  .page-about .about-principle:nth-child(even) {
    padding-left: 24px;
    border-left: 1px solid var(--line);
  }

  .page-about .about-principles-bottom {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-scenarios {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }

  .page-about .about-scenario:nth-child(odd) {
    padding-right: 24px;
  }

  .page-about .about-scenario:nth-child(even) {
    padding-left: 24px;
    border-left: 1px solid var(--line);
  }

  .page-about .about-scenario:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero-meta {
    margin: 0;
    padding-top: 12px;
    border-top-width: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-sidebar-w) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 40px;
  }

  .page-about .about-chapters {
    display: block;
    position: sticky;
    top: calc(var(--header-sticky-h) + 20px);
    align-self: start;
    margin-top: 6px;
    padding-left: 18px;
    border-left: 1px solid var(--line);
  }

  .page-about .chapter-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 18px;
  }

  .page-about .chapter-nav a {
    display: flex;
    gap: 8px;
    padding: 8px 0;
    font-size: 0.89rem;
    line-height: 1.4;
    color: var(--text-dim);
    text-decoration: none;
    border-bottom: 1px solid transparent;
  }

  .page-about .chapter-nav a span {
    width: 24px;
    flex: 0 0 auto;
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--cyan);
  }

  .page-about .chapter-nav a:hover,
  .page-about .chapter-nav a.is-active {
    color: var(--text);
    border-bottom-color: var(--cyan);
  }

  .page-about .about-chapters-label {
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
  }

  .page-about .about-chapters-note {
    margin-top: 28px;
    padding-top: 16px;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-dim);
    border-top: 1px solid var(--line);
  }

  .page-about .about-articles {
    max-width: var(--about-article-w);
  }
}