.page-about {
  --timeline-node-size: 22px;
  --timeline-axis-gap: 18px;
  --timeline-padding: calc(var(--timeline-node-size) + var(--timeline-axis-gap) * 2);
}

.page-about .brand-hero {
  position: relative;
  overflow: hidden;
  padding-top: 48px;
}
.page-about .brand-hero::after {
  content: "";
  position: absolute;
  right: -40%;
  top: -160px;
  width: 72%;
  height: 420px;
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.10), rgba(0, 85, 255, 0.04));
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}
.page-about .brand-hero > * {
  position: relative;
  z-index: 1;
}
.page-about .brand-hero__index {
  font-family: var(--font-headline);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin: 28px 0 0;
}
.page-about .brand-hero__tagline {
  color: var(--gold);
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin: 14px 0 18px;
}
.page-about .brand-hero__title {
  font-family: var(--font-headline);
  font-size: clamp(2.05rem, 8vw, 4.6rem);
  line-height: 1.15;
  letter-spacing: 0.01em;
  font-weight: 500;
  margin: 0 0 20px;
}
.page-about .brand-hero__lead {
  color: var(--metal);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 60ch;
  margin: 0 0 28px;
  border-left: 2px solid var(--border);
  padding-left: 18px;
}
.page-about .brand-hero__statement {
  margin: 28px 0 0;
  padding: 22px 24px;
  border-left: 4px solid var(--accent);
  background: linear-gradient(120deg, rgba(0, 255, 136, 0.14), rgba(0, 85, 255, 0.04));
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  max-width: 560px;
}
.page-about .brand-hero__statement p {
  font-family: var(--font-headline);
  font-size: clamp(1.2rem, 3.5vw, 2rem);
  line-height: 1.3;
  margin: 0;
}
.page-about .brand-hero__statement cite {
  display: block;
  margin-top: 10px;
  color: var(--metal);
  font-style: normal;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .timeline {
  position: relative;
  padding-left: var(--timeline-padding);
  margin-top: 40px;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: calc(var(--timeline-node-size) / 2);
  top: 12px;
  bottom: 12px;
  border-left: 2px dashed var(--accent);
  opacity: 0.65;
}
.page-about .timeline-intro {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 16px;
  align-items: center;
  margin: 0 0 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 16px;
}
.page-about .timeline-intro img {
  width: 90px;
  height: 90px;
  object-fit: cover;
  display: block;
  border: 1px solid var(--border);
}
.page-about .timeline-intro__text {
  margin: 0;
  color: var(--metal);
  font-size: 0.86rem;
  line-height: 1.65;
}
.page-about .timeline-item {
  position: relative;
  margin-bottom: 36px;
}
.page-about .timeline-node {
  position: absolute;
  left: calc(-1 * var(--timeline-padding));
  top: 24px;
  width: var(--timeline-node-size);
  height: var(--timeline-node-size);
  background: var(--gold);
  transform: rotate(45deg);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--gold);
}
.page-about .timeline-card {
  background: var(--bg-secondary);
  border-top: 2px solid var(--accent);
  padding: 20px 20px 14px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}
.page-about .timeline-year,
.page-about .timeline-card__title,
.page-about .timeline-card__desc {
  display: block;
}
.page-about .timeline-year {
  font-family: var(--font-headline);
  color: var(--gold);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  margin-bottom: 8px;
}
.page-about .timeline-card__title {
  font-family: var(--font-headline);
  color: var(--white);
  font-size: 1.1rem;
  line-height: 1.4;
  margin: 0 0 10px;
}
.page-about .timeline-card__desc {
  color: var(--metal);
  font-size: 0.94rem;
  line-height: 1.7;
  margin: 0;
}
.page-about .timeline-more {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
.page-about .timeline-more summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  user-select: none;
  transition: color var(--transition);
}
.page-about .timeline-more summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline-more summary::before {
  content: "+";
  font-family: var(--font-headline);
  color: var(--gold);
  line-height: 1;
}
.page-about .timeline-more[open] summary::before {
  content: "−";
}
.page-about .timeline-more summary:hover {
  color: var(--gold);
}
.page-about .timeline-more > p,
.page-about .timeline-more > ul {
  margin: 12px 0 0;
  color: var(--metal);
  font-size: 0.9rem;
  line-height: 1.7;
}
.page-about .timeline-more ul {
  padding-left: 18px;
}
.page-about .history-cta {
  margin: 32px 0 8px;
  text-align: right;
}

.page-about .arch-content {
  display: grid;
  gap: 28px;
  margin-top: 40px;
}
.page-about .arch-subtitle {
  font-family: var(--font-headline);
  font-size: 1.15rem;
  margin: 0 0 14px;
  color: var(--white);
}
.page-about .arch-text > p {
  color: var(--metal);
  line-height: 1.75;
  font-size: 0.96rem;
  margin: 0 0 14px;
}
.page-about .arch-list {
  list-style: none;
  padding: 0;
  margin: 16px 0;
  display: grid;
  gap: 10px;
}
.page-about .arch-list li {
  padding-left: 18px;
  border-left: 2px solid var(--blue);
  color: var(--metal);
  line-height: 1.6;
  font-size: 0.95rem;
}
.page-about .arch-list li strong {
  color: var(--white);
}
.page-about .arch-svg-figure,
.page-about .arch-img-figure {
  margin: 0;
  border: 1px solid var(--border);
  background: var(--bg-deep);
  padding: 12px;
}
.page-about .arch-svg-figure svg,
.page-about .arch-img-figure img {
  width: 100%;
  height: auto;
  display: block;
}
.page-about .arch-img-figure img {
  max-height: 640px;
  object-fit: cover;
}
.page-about .arch-svg-figure figcaption,
.page-about .arch-img-figure figcaption {
  margin-top: 10px;
  color: var(--metal);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}
.page-about .arch-svg-figure svg rect {
  transition: fill var(--transition), stroke var(--transition);
}
.page-about .arch-svg-figure svg rect:hover {
  fill: #223A58;
  stroke: var(--accent);
}

.page-about .scale-grid {
  display: grid;
  gap: 28px;
  margin-top: 36px;
}
.page-about .scale-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.page-about .scale-map {
  margin: 0;
  border: 1px solid var(--border);
  background: var(--bg-deep);
  padding: 12px;
}
.page-about .scale-map img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .scale-map figcaption {
  margin-top: 10px;
  color: var(--metal);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}
.page-about .scale-note {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 3px solid var(--violet);
  background: rgba(138, 43, 226, 0.08);
  color: var(--metal);
  line-height: 1.7;
  font-size: 0.92rem;
}

.page-about .cert-list {
  display: grid;
  gap: 18px;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .cert-card {
  background: var(--bg-secondary);
  padding: 24px 20px;
  border: 1px solid var(--border);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}
.page-about .cert-card__badge {
  display: inline-block;
  font-family: var(--font-headline);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  border: 1px solid var(--gold);
  padding: 4px 8px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.page-about .cert-card__badge--violet {
  color: var(--violet);
  border-color: var(--violet);
}
.page-about .cert-card__title {
  font-family: var(--font-headline);
  font-size: 1.05rem;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--white);
}
.page-about .cert-card__text {
  color: var(--metal);
  line-height: 1.65;
  font-size: 0.92rem;
  margin: 0 0 14px;
}

.page-about .next-links {
  padding-bottom: 56px;
}

@media (min-width: 768px) {
  .page-about .timeline-intro {
    grid-template-columns: 120px 1fr;
  }
  .page-about .timeline-intro img {
    width: 120px;
    height: 120px;
  }
  .page-about .scale-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .timeline {
    padding-left: 0;
  }
  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }
  .page-about .timeline-intro {
    width: calc(50% - 36px);
    grid-template-columns: 120px 1fr;
    margin-bottom: 56px;
  }
  .page-about .timeline-intro img {
    width: 120px;
    height: 120px;
  }
  .page-about .timeline-item {
    width: calc(50% - 36px);
    margin-bottom: 52px;
  }
  .page-about .timeline-item--left {
    margin-right: calc(50% + 36px);
  }
  .page-about .timeline-item--right {
    margin-left: calc(50% + 36px);
  }
  .page-about .timeline-item--left .timeline-node {
    left: auto;
    right: -47px;
  }
  .page-about .timeline-item--right .timeline-node {
    left: -47px;
  }
  .page-about .arch-content {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .arch-text {
    grid-column: 1 / -1;
  }
  .page-about .scale-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .cert-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}