.page-about {
  background-color: var(--color-light);
  overflow: hidden;
}

.page-about .breadcrumbs {
  padding-top: 0.25rem;
}

.page-about .breadcrumbs-sep {
  margin: 0 0.5rem;
  color: rgba(255, 255, 255, 0.45);
}

.page-about .breadcrumbs-item {
  color: rgba(255, 255, 255, 0.72);
}

.page-about .breadcrumbs-item a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  transition: color 0.3s var(--ease-out);
}

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

.page-about .breadcrumbs-item.is-current {
  color: rgba(255, 255, 255, 0.95);
}

.page-about__hero {
  position: relative;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 2.5rem 0 4.5rem;
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  right: -3rem;
  top: -2rem;
  width: 15rem;
  height: 15rem;
  background-color: var(--color-accent);
  clip-path: polygon(15% 0, 100% 0, 100% 85%, 0 100%);
  opacity: 0.4;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  left: 42%;
  bottom: -7rem;
  width: 20rem;
  height: 20rem;
  border: 2px solid rgba(255, 215, 0, 0.35);
  border-radius: 50%;
}

.page-about__hero .container {
  position: relative;
  z-index: 1;
}

.page-about__hero-index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.18em;
  color: var(--color-gold);
  margin-bottom: 1rem;
}

.page-about__hero-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.02em;
  margin: 0;
}

.page-about__hero-lead {
  font-size: 1.125rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.92);
  max-width: 34rem;
  margin-top: 0.75rem;
}

.page-about__hero-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.65);
  max-width: 28rem;
  margin-top: 1rem;
}

.page-about__manifesto {
  background-color: var(--color-light);
  padding: 4rem 0;
}

.page-about__manifesto-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.page-about__manifesto-copy p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-ink);
  margin-top: 1rem;
}

.page-about__manifesto-note {
  font-weight: 700;
  color: var(--color-accent);
  border-left: 4px solid var(--color-accent);
  padding-left: 1rem;
}

.page-about__image-block {
  margin: 0;
}

.page-about__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about__image-block figcaption {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: #6b7280;
  line-height: 1.5;
}

.page-about__img--floating {
  transform: rotate(-1.5deg);
}

.page-about__band {
  height: 3rem;
  background-color: var(--color-primary);
  clip-path: polygon(0 0, 100% 25%, 100% 100%, 0 75%);
  margin-top: -1px;
}

.page-about__band--flip {
  background-color: var(--color-light);
  clip-path: polygon(0 25%, 100% 0, 100% 75%, 0 100%);
}

.page-about__timeline-section {
  position: relative;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 4rem 0;
  overflow: hidden;
}

.page-about__timeline-section::after {
  content: "";
  position: absolute;
  right: -5rem;
  top: 6rem;
  width: 18rem;
  height: 18rem;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__timeline-section .container {
  position: relative;
  z-index: 1;
}

.page-about .section-heading--on-dark .head-index {
  color: var(--color-gold);
}

.page-about .section-heading--on-dark h2 {
  color: var(--color-white);
}

.page-about__timeline-intro {
  max-width: 40rem;
  margin-top: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.75);
}

.page-about__timeline {
  position: relative;
  margin-top: 3rem;
  padding-left: 2.75rem;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 2px;
  border-radius: 2px;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, var(--color-accent), var(--color-gold));
}

.page-about__milestone {
  position: relative;
  padding-bottom: 2.25rem;
}

.page-about__milestone:last-child {
  padding-bottom: 0;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 2rem;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 4px rgba(255, 107, 0, 0.35);
  transform: translateX(-50%);
}

.page-about__milestone-card {
  background: rgba(255, 255, 255, 0.08);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: background-color 0.3s var(--ease-out), border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.page-about__milestone-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0;
}

.page-about__milestone-card p {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
}

.page-about__milestone-version {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  background: rgba(255, 107, 0, 0.15);
  border: 1px solid rgba(255, 215, 0, 0.3);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.75rem;
}

.page-about__milestone--current .page-about__milestone-card {
  border-color: var(--color-gold);
  background: rgba(255, 215, 0, 0.1);
}

.page-about__milestone--current::before {
  background: var(--color-gold);
  box-shadow: 0 0 0 4px rgba(255, 215, 0, 0.3);
}

.page-about__milestone-link {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease-out);
}

.page-about__milestone-link:hover {
  border-color: var(--color-accent);
}

.page-about__chart {
  margin-top: 3rem;
}

.page-about__architecture {
  background-color: var(--color-light);
  padding: 4rem 0;
}

.page-about__architecture-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about__architecture-copy > p:first-of-type {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-ink);
  margin-bottom: 1.5rem;
}

.page-about__arch-card {
  background-color: var(--color-white);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about__arch-card:nth-child(2) {
  border-left-color: var(--color-jade);
}

.page-about__arch-card:nth-child(3) {
  border-left-color: var(--color-wine);
}

.page-about__arch-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-indigo);
  background: rgba(60, 79, 118, 0.08);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
  margin-bottom: 0.5rem;
}

.page-about__arch-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
}

.page-about__arch-card p {
  margin-top: 0.375rem;
  font-size: 0.925rem;
  line-height: 1.7;
  color: #4b5563;
}

.page-about__arch-details {
  margin-top: 1.25rem;
  border-top: 1px solid rgba(10, 31, 68, 0.15);
  padding-top: 1rem;
  font-size: 0.9rem;
}

.page-about__arch-details summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--color-indigo);
}

.page-about__arch-details p {
  margin-top: 0.75rem;
  line-height: 1.7;
  color: var(--color-ink);
}

.page-about__arch-more {
  font-size: 0.925rem;
  color: var(--color-ink);
  margin-top: 1.5rem;
}

.page-about__arch-more a {
  color: var(--color-accent);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent);
}

.page-about__arch-image {
  align-self: center;
}

.page-about__values {
  position: relative;
  background-color: var(--color-primary);
  padding: 4rem 0 5rem;
  overflow: hidden;
}

.page-about__values::before {
  content: "";
  position: absolute;
  right: -5rem;
  bottom: -5rem;
  width: 20rem;
  height: 20rem;
  background: linear-gradient(135deg, rgba(20, 108, 92, 0.4), rgba(255, 107, 0, 0.2));
  clip-path: polygon(30% 0, 100% 40%, 100% 100%, 0 70%);
  pointer-events: none;
}

.page-about__values .container {
  position: relative;
  z-index: 1;
}

.page-about__values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.page-about__value-card {
  background: rgba(255, 255, 255, 0.07);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: background-color 0.3s var(--ease-out), border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.page-about__value-card:hover {
  background: rgba(255, 255, 255, 0.11);
  border-color: var(--color-accent);
}

.page-about__value-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-gold);
  letter-spacing: 0.15em;
}

.page-about__value-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  margin: 0.75rem 0 0.5rem;
}

.page-about__value-card p {
  font-size: 0.925rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.75);
}

.page-about__cta {
  margin-top: 3rem;
  background: rgba(255, 255, 255, 0.06);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
}

.page-about__cta p {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 1.25rem;
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.page-about .page-about__cta .btn-outline {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--color-white);
}

.page-about .page-about__cta .btn-outline:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.12);
}

@media (hover: hover) {
  .page-about__milestone-card:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--color-accent);
    transform: translateY(-2px);
  }

  .page-about__arch-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(10, 31, 68, 0.12);
  }
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 3.5rem 0 6rem;
  }

  .page-about__hero-title {
    font-size: 3.25rem;
  }

  .page-about__hero-lead {
    font-size: 1.375rem;
  }

  .page-about__manifesto,
  .page-about__timeline-section,
  .page-about__architecture,
  .page-about__values {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }

  .page-about__manifesto-grid {
    grid-template-columns: 1.25fr 1fr;
    gap: 4rem;
  }

  .page-about__values-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

@media (min-width: 900px) {
  .page-about__architecture-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }

  .page-about__timeline {
    padding-left: 3.5rem;
  }

  .page-about__milestone-card {
    padding: 1.75rem 2rem;
  }
}