.page-about {
  --about-bg: var(--color-bg);
  --about-card-bg: var(--color-surface);
  --about-accent-line: linear-gradient(135deg, var(--color-accent) 0%, var(--color-support) 100%);
  background: var(--about-bg);
  scroll-behavior: smooth;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.page-about .breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease);
}

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

.page-about .about-hero {
  position: relative;
  padding: var(--space-6) 0 var(--space-8);
  overflow: hidden;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.18;
  color: var(--color-primary);
  margin: var(--space-4) 0;
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-lead {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
  position: relative;
  z-index: 1;
}

.page-about .hero-stat {
  background: var(--about-card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  box-shadow: 0 4px 16px rgba(10, 31, 68, 0.04);
  transition: transform var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease);
}

.page-about .hero-stat:nth-child(2) {
  border-left-color: var(--color-support);
}

.page-about .hero-stat:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(10, 31, 68, 0.1);
  border-color: var(--color-primary);
}

.page-about .hero-stat-num {
  font-family: var(--font-numeric);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  display: block;
  letter-spacing: -0.02em;
}

.page-about .hero-stat-label {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  display: block;
  margin-top: var(--space-2);
  line-height: 1.4;
}

.page-about .hero-ribbon {
  display: none;
}

.page-about .about-section {
  margin-bottom: var(--space-10);
  scroll-margin-top: 90px;
}

.page-about .section-head {
  margin-bottom: var(--space-6);
}

.page-about .section-kicker {
  font-family: var(--font-numeric);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  display: inline-block;
  margin-bottom: var(--space-2);
}

.page-about .section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.25;
  color: var(--color-primary);
  margin: 0;
}

.page-about .section-description {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin-top: var(--space-3);
}

.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}

.page-about .origin-copy p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--color-text);
  margin: 0 0 var(--space-4);
}

.page-about .origin-figure,
.page-about .milestones-figure,
.page-about .upgrade-figure {
  margin: 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: 0 8px 24px rgba(10, 31, 68, 0.06);
}

.page-about .origin-figure img,
.page-about .milestones-figure img,
.page-about .upgrade-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--color-border);
}

.page-about .origin-figure figcaption,
.page-about .milestones-figure figcaption,
.page-about .upgrade-figure figcaption {
  padding: var(--space-4) var(--space-5);
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  border-top: 1px solid var(--color-border);
}

.page-about .timeline-decor {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 0 var(--space-4) auto;
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 27px;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--color-support) 0%, var(--color-accent) 100%);
  opacity: 0.4;
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: var(--space-6);
}

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

.page-about .timeline-marker {
  position: relative;
  z-index: 1;
  display: inline-flex;
  text-decoration: none;
  margin-bottom: var(--space-3);
  outline: none;
}

.page-about .timeline-marker:focus-visible {
  border-radius: var(--radius-lg);
  box-shadow: 0 0 0 3px var(--color-accent);
}

.page-about .version-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 18px;
  background: var(--color-primary);
  color: var(--color-surface);
  font-family: var(--font-numeric);
  font-size: 0.78rem;
  font-weight: 700;
  border: 2px solid var(--color-surface);
  box-shadow: 0 0 0 3px var(--color-support), 0 6px 16px rgba(10, 31, 68, 0.18);
  transition: transform var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease);
}

.page-about .version-chip--start {
  background: var(--color-support-dark);
  font-size: 0.7rem;
}

.page-about .version-chip--accent {
  background: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent), 0 6px 18px rgba(255, 107, 53, 0.3);
}

.page-about .timeline-marker:hover .version-chip {
  transform: translateY(-3px) rotate(2deg);
  box-shadow: 0 0 0 3px var(--color-accent), 0 10px 24px rgba(10, 31, 68, 0.25);
}

.page-about .timeline-card {
  background: var(--about-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-left: 0;
  transition: border-color var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease), transform var(--duration-fast) var(--ease);
}

.page-about .timeline-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 10px 30px rgba(10, 31, 68, 0.1);
  transform: translateX(4px);
}

.page-about .timeline-card--highlight {
  border-left: 4px solid var(--color-accent);
}

.page-about .timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}

.page-about .timeline-stage {
  display: inline-block;
  font-family: var(--font-numeric);
  font-size: 0.75rem;
  color: var(--color-support-dark);
  background: rgba(0, 194, 168, 0.1);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.8rem;
  margin-bottom: var(--space-3);
}

.page-about .timeline-card p:last-child {
  margin-bottom: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text);
}

.page-about .milestones-figure {
  margin-top: var(--space-6);
  max-width: 760px;
}

.page-about .upgrade-section {
  background: var(--color-primary);
  color: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-5);
  box-shadow: 0 16px 44px rgba(10, 31, 68, 0.25);
}

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

.page-about .upgrade-section .section-title {
  color: var(--color-surface);
}

.page-about .upgrade-lead {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(247, 242, 233, 0.82);
  max-width: 680px;
  margin: 0 0 var(--space-6);
}

.page-about .upgrade-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

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

.page-about .principle-item {
  position: relative;
  background: var(--color-primary-light);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease);
}

.page-about .principle-item:hover {
  border-color: var(--color-support);
  background: rgba(22, 48, 107, 0.7);
}

.page-about .principle-index {
  display: inline-block;
  font-family: var(--font-numeric);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-surface);
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  padding: 0.18rem 0.7rem;
  margin-bottom: var(--space-3);
}

.page-about .principle-item h3 {
  font-size: 1rem;
  color: var(--color-surface);
  margin: 0 0 var(--space-2);
}

.page-about .principle-item p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(247, 242, 233, 0.78);
  margin: 0;
}

.page-about .btn--light {
  border-color: var(--color-support);
  color: var(--color-surface);
}

.page-about .btn--light:hover {
  background: var(--color-support);
  color: var(--color-primary);
}

.page-about .upgrade-figure {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.12);
}

.page-about .upgrade-figure figcaption {
  color: rgba(247, 242, 233, 0.7);
  border-top-color: rgba(255, 255, 255, 0.12);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.page-about .team-card {
  position: relative;
  background: var(--about-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-5);
  transition: transform var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 31, 68, 0.1);
  border-color: var(--color-primary);
}

.page-about .team-card-index {
  display: inline-block;
  font-family: var(--font-numeric);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-surface);
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  padding: 0.18rem 0.65rem;
  margin-bottom: var(--space-4);
}

.page-about .team-card:nth-child(2) .team-card-index {
  background: var(--color-accent);
}

.page-about .team-card:nth-child(3) .team-card-index {
  background: var(--color-support-dark);
}

.page-about .team-card:nth-child(4) .team-card-index {
  background: var(--color-primary-light);
}

.page-about .team-card h3 {
  font-size: 1.05rem;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}

.page-about .team-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text);
  margin: 0;
}

.page-about .team-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: var(--space-8);
  }

  .page-about .about-hero h1 {
    max-width: 860px;
  }

  .page-about .about-hero-stats {
    grid-template-columns: repeat(3, minmax(0, 220px));
  }

  .page-about .hero-ribbon {
    display: block;
    position: absolute;
    right: -60px;
    top: 20px;
    width: 180px;
    height: 36px;
    background: var(--color-accent);
    transform: rotate(38deg);
    opacity: 0.85;
    border-radius: var(--radius-sm);
  }

  .page-about .origin-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .page-about .origin-figure {
    margin-left: auto;
    max-width: 460px;
  }

  .page-about .origin-figure img {
    aspect-ratio: 16 / 9;
  }

  .page-about .timeline {
    padding-left: 60px;
  }

  .page-about .timeline::before {
    left: 58px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--space-6);
    padding-bottom: var(--space-8);
  }

  .page-about .timeline-marker {
    justify-self: center;
    margin-bottom: 0;
  }

  .page-about .timeline-card {
    margin-left: 0;
  }

  .page-about .milestones-figure {
    margin-top: var(--space-8);
    margin-left: 60px;
  }

  .page-about .upgrade-section {
    padding: var(--space-10) var(--space-8);
  }

  .page-about .upgrade-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: var(--space-8);
  }

  .page-about .upgrade-figure {
    align-self: stretch;
    display: flex;
    flex-direction: column;
  }

  .page-about .upgrade-figure img {
    flex: 1;
    object-position: center;
  }

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

  .page-about .team-card {
    padding: var(--space-8) var(--space-6);
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .team-card {
    padding: var(--space-8) var(--space-5);
  }

  .page-about .origin-figure img,
  .page-about .milestones-figure img,
  .page-about .upgrade-figure img {
    min-height: 220px;
  }
}