.page-about {
  position: relative;
  background: var(--bg-content);
  color: var(--text-main);
  overflow-x: hidden;
  font-family: var(--font-body);
}

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

.page-about .hero-breadcrumb .crumb-item {
  color: var(--secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-decoration: none;
}

.page-about .hero-breadcrumb .crumb-item[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

/* ===== contour layer ===== */
.page-about .contour-layer {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .contour-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  min-height: 4800px;
  opacity: 0.85;
}

.page-about .contour-line {
  fill: none;
  stroke: var(--secondary);
  stroke-width: 1.6;
  stroke-dasharray: 8 12;
  vector-effect: non-scaling-stroke;
}

.page-about .contour-b {
  stroke-width: 1;
  stroke-dasharray: 3 14;
  opacity: 0.55;
}

.page-about .contour-c {
  stroke-width: 0.7;
  stroke-dasharray: 1 16;
  opacity: 0.35;
}

.page-about .page-section--dark .contour-line {
  stroke: rgba(199, 222, 247, 0.28);
}

/* ===== hero ===== */
.page-about .about-hero {
  position: relative;
  z-index: 1;
  background: var(--bg-main);
  color: var(--snow);
  padding: 1.75rem 1.25rem 3.5rem;
}

.page-about .hero-inner {
  max-width: var(--max-container);
  margin: 0 auto;
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .hero-media {
  position: relative;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
}

.page-about .hero-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 6px solid var(--navy);
}

.page-about .hero-media-tag {
  position: absolute;
  right: 0;
  bottom: 0;
  background: var(--accent);
  color: var(--navy);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.6rem 1rem;
  transform: translate(8px, 8px);
}

.page-about .hero-copy {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .hero-kicker {
  color: var(--accent);
}

.page-about .hero-title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--snow);
}

.page-about .hero-lead {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--secondary);
  max-width: 44ch;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: rgba(199, 222, 247, 0.2);
  border: 1px solid rgba(199, 222, 247, 0.3);
  max-width: 480px;
}

.page-about .stat-item {
  background: var(--bg-main);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .stat-num {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.6rem;
  color: var(--accent);
  line-height: 1;
}

.page-about .stat-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--secondary);
}

.page-about .hero-divider {
  height: 6px;
  background: var(--accent);
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
}

/* ===== section head base ===== */
.page-about .section-head {
  position: relative;
  z-index: 1;
  margin-bottom: 2.5rem;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
}

.page-about .section-title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.12;
  margin: 0 0 0.75rem;
  color: var(--primary);
}

.page-about .section-intro {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

/* ===== history ===== */
.page-about .about-history {
  position: relative;
  z-index: 1;
  padding: 4rem 1.25rem;
}

.page-about .history-intro {
  max-width: 50ch;
}

.page-about .timeline {
  position: relative;
  padding: 1rem 0 2rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 14px;
  width: 2px;
  background: var(--line);
}

.page-about .timeline-entry {
  position: relative;
  margin-bottom: 2.25rem;
  padding-left: 44px;
}

.page-about .timeline-marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg-content);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateX(0);
  box-shadow: 0 0 0 2px var(--line);
}

.page-about .marker-year {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--snow);
  letter-spacing: 0.02em;
}

.page-about .marker-year.now {
  color: var(--accent);
}

.page-about .timeline-card {
  background: var(--snow);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  box-shadow: 4px 4px 0 rgba(11, 34, 66, 0.08);
}

.page-about .timeline-title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.2rem;
  margin: 0 0 0.4rem;
  color: var(--primary);
}

.page-about .timeline-excerpt {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about .timeline-more {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 0.75rem;
  margin-top: 0.75rem;
}

.page-about .timeline-more p {
  margin: 0;
}

/* ===== versions ===== */
.page-about .about-versions {
  position: relative;
  z-index: 1;
  background: var(--navy);
  color: var(--snow);
  padding: 4rem 1.25rem;
}

.page-about .versions-head .section-title {
  color: var(--snow);
}

.page-about .versions-head .section-intro {
  color: var(--secondary);
}

.page-about .version-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.page-about .version-card {
  background: rgba(199, 222, 247, 0.08);
  border: 1px solid rgba(199, 222, 247, 0.18);
  padding: 1.4rem 1.35rem;
  position: relative;
}

.page-about .version-v3 {
  background: var(--bg-main);
  border-color: var(--accent);
  box-shadow: 6px 6px 0 rgba(255, 107, 44, 0.3);
}

.page-about .version-top {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.page-about .version-name {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 2rem;
  color: var(--snow);
  line-height: 1;
}

.page-about .version-v3 .version-name {
  color: var(--accent);
}

.page-about .version-era {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--secondary);
  letter-spacing: 0.04em;
}

.page-about .version-features {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .version-features li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--secondary);
}

.page-about .version-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--secondary);
}

.page-about .version-v3 .version-features li::before {
  background: var(--accent);
}

.page-about .version-badge {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  background: var(--accent);
  color: var(--navy);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.6rem;
}

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

.page-about .version-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(199, 222, 247, 0.25);
}

.page-about .version-caption {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--secondary);
  max-width: 60ch;
}

/* ===== team ===== */
.page-about .about-team {
  position: relative;
  z-index: 1;
  padding: 4rem 1.25rem;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .team-item {
  background: var(--snow);
  border: 1px solid var(--line);
  padding: 1.4rem 1.35rem;
}

.page-about .team-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: var(--snow);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.1rem;
  margin-bottom: 0.85rem;
}

.page-about .team-title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
  color: var(--primary);
}

.page-about .team-desc {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about .team-process {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0.5rem;
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.page-about .process-step {
  background: var(--bg-content);
  border: 1px solid var(--line);
  padding: 0.55rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--primary);
}

.page-about .process-step:first-child {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--navy);
  font-weight: 700;
}

.page-about .process-step:last-child {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--snow);
  font-weight: 700;
}

/* ===== ecosystem ===== */
.page-about .about-eco {
  position: relative;
  z-index: 1;
  background: var(--bg-main);
  color: var(--snow);
  padding: 4rem 1.25rem;
}

.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .eco-head .section-title {
  color: var(--snow);
}

.page-about .eco-text {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--secondary);
  max-width: 52ch;
}

.page-about .eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

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

.page-about .eco-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid rgba(199, 222, 247, 0.25);
}

.page-about .eco-caption {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--secondary);
  max-width: 54ch;
}

/* ===== honors ===== */
.page-about .about-honors {
  position: relative;
  z-index: 1;
  padding: 4rem 1.25rem;
}

.page-about .honor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .honor-card {
  position: relative;
  background: var(--snow);
  border: 1px solid var(--accent);
  border-right-width: 4px;
  padding: 1.5rem 1.4rem 1.75rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .honor-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 700;
  display: block;
  margin-bottom: 0.6rem;
}

.page-about .honor-title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.15rem;
  margin: 0 0 0.5rem;
  color: var(--primary);
}

.page-about .honor-text {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ===== cta ===== */
.page-about .about-cta {
  position: relative;
  z-index: 1;
  background: var(--navy);
  color: var(--snow);
  padding: 4rem 1.25rem;
}

.page-about .cta-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.page-about .cta-kicker {
  color: var(--accent);
}

.page-about .cta-title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(1.9rem, 5vw, 3.2rem);
  line-height: 1.12;
  margin: 0;
  color: var(--snow);
}

.page-about .cta-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--secondary);
  max-width: 46ch;
  margin: 0;
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.page-about .cta-links .btn-outline {
  border-color: var(--secondary);
  color: var(--snow);
}

.page-about .cta-links .btn-outline:hover {
  background: var(--secondary);
  color: var(--navy);
}

/* ===== reveal base ===== */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== tablet ===== */
@media (min-width: 768px) {
  .page-about .hero-grid {
    grid-template-columns: 1fr 1.15fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .hero-media {
    margin: 0;
    max-width: 360px;
    justify-self: end;
  }

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

  .page-about .version-v3 {
    grid-column: 1 / -1;
  }

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

  .page-about .team-process {
    flex-wrap: nowrap;
  }

  .page-about .process-step {
    flex: 1;
    text-align: center;
  }

  .page-about .eco-grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 2.5rem;
    align-items: center;
  }

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

  .page-about .about-honors,
  .page-about .about-team,
  .page-about .about-versions,
  .page-about .about-eco {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  .page-about .about-hero {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  .page-about .timeline-entry.right {
    margin-left: 12%;
  }

  .page-about .timeline-entry.left {
    padding-right: 12%;
  }

  .page-about .timeline-more {
    display: block;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.35s var(--ease), opacity 0.3s var(--ease);
  }

  .page-about .timeline-entry:hover .timeline-more,
  .page-about .timeline-entry:focus-within .timeline-more {
    max-height: 220px;
    opacity: 1;
  }

  .page-about .timeline-card {
    transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
  }
}

/* ===== desktop ===== */
@media (min-width: 1024px) {
  .page-about .about-hero,
  .page-about .about-history,
  .page-about .about-versions,
  .page-about .about-team,
  .page-about .about-eco,
  .page-about .about-honors,
  .page-about .about-cta {
    padding-left: 3rem;
    padding-right: 3rem;
  }

  .page-about .hero-grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
    align-items: center;
  }

  .page-about .hero-media {
    max-width: 320px;
  }

  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .timeline-entry {
    width: 50%;
    padding-left: 0;
    margin-bottom: 3rem;
  }

  .page-about .timeline-entry.left {
    margin-left: 0;
    padding-right: 48px;
  }

  .page-about .timeline-entry.right {
    margin-left: 50%;
    padding-left: 48px;
  }

  .page-about .timeline-marker {
    left: auto;
    right: -15px;
    width: 34px;
    height: 34px;
  }

  .page-about .timeline-entry.right .timeline-marker {
    right: auto;
    left: -15px;
  }

  .page-about .timeline-entry.left .timeline-card {
    border-left: none;
    border-right: 3px solid var(--accent);
  }

  .page-about .timeline-entry.right .timeline-card {
    border-left: 3px solid var(--accent);
  }

  .page-about .version-grid {
    grid-template-columns: 1fr 1fr 1fr;
    align-items: stretch;
  }

  .page-about .version-v3 {
    grid-column: auto;
  }

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

  .page-about .version-features {
    flex: 1;
  }

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

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

  .page-about .cta-inner {
    align-items: center;
    text-align: center;
  }
}