.page-about {
  --about-grid: rgba(0, 212, 255, 0.05);
  position: relative;
  background-color: var(--color-primary);
  color: #F5F0E6;
}

.page-about::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

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

/* Hero */
.page-about__hero {
  padding-top: calc(var(--header-height) + var(--space-3));
  padding-bottom: var(--space-5);
}

.page-about__hero-inner {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-3);
}

.page-about__hero-copy {
  max-width: 720px;
}

.page-about__hero h1 {
  font-family: var(--font-headline);
  font-size: 2.1rem;
  line-height: 1.2;
  margin: var(--space-2) 0 0;
  color: #F5F0E6;
  max-width: 640px;
}

.page-about__lead {
  font-family: var(--font-headline);
  font-size: 1.05rem;
  line-height: 1.75;
  margin: var(--space-3) 0 0;
  color: #EAE6DE;
  max-width: 600px;
}

.page-about__mission {
  margin: var(--space-3) 0 0;
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-highlight);
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.8;
  max-width: 540px;
}

.page-about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.page-about .data-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  padding: var(--space-3);
  position: relative;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .data-card:hover {
  border-color: var(--color-border-bright);
  transform: translateY(-3px);
}

.page-about .data-card::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 14px;
  height: 14px;
  border-top: 2px solid var(--color-accent);
  border-right: 2px solid var(--color-accent);
}

.page-about .data-card__label {
  display: block;
  font-family: var(--font-headline);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: #C9C4BA;
  text-transform: uppercase;
}

.page-about .data-card__value {
  display: block;
  font-family: var(--font-data);
  font-size: 1.5rem;
  line-height: 1.25;
  color: var(--color-accent);
  margin: var(--space-1) 0 2px;
}

.page-about .data-card__unit {
  display: block;
  font-size: 0.72rem;
  line-height: 1.4;
  color: var(--color-muted);
}

/* Tech */
.page-about__tech,
.page-about__ecosystem {
  background: var(--color-bg-alt);
  color: var(--color-text-dark);
  padding: var(--space-5) 0;
}

.page-about__tech .section__title,
.page-about__ecosystem .section__title {
  color: var(--color-text-dark);
}

.page-about__tech .section__desc,
.page-about__ecosystem .section__desc {
  color: #4A453F;
}

.page-about__tech-layout {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.page-about__layer {
  background: rgba(245, 240, 230, 0.72);
  border: 1px solid rgba(30, 26, 23, 0.08);
  border-left: 3px solid var(--color-accent);
  padding: var(--space-3);
}

.page-about__layer + .page-about__layer {
  margin-top: var(--space-3);
}

.page-about__layer-index {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: var(--space-1);
}

.page-about__layer h3 {
  font-family: var(--font-headline);
  font-size: 1rem;
  margin: 0 0 8px;
  color: var(--color-text-dark);
}

.page-about__layer p {
  font-size: 0.86rem;
  line-height: 1.7;
  margin: 0;
  color: #4A453F;
}

.page-about__tech-diagram {
  background: var(--color-primary);
  border: 1px solid var(--color-border);
  padding: var(--space-3);
  overflow-x: auto;
}

.page-about__arch-svg {
  display: block;
  width: 100%;
  min-width: 420px;
  height: auto;
}

.page-about__arch-text {
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 600;
  fill: #F5F0E6;
}

.page-about__arch-sub {
  font-family: var(--font-data);
  font-size: 10px;
  fill: var(--color-highlight);
}

.page-about__arch-detail {
  font-family: var(--font-data);
  font-size: 9px;
  fill: rgba(245, 240, 230, 0.75);
}

.page-about__arch-node rect {
  transition: stroke-width 0.25s var(--ease);
}

.page-about__arch-node:hover rect {
  stroke-width: 3;
}

@media (hover: hover) {
  .page-about__arch-detail {
    opacity: 0;
    transform: translateY(2px);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }

  .page-about__arch-node:hover .page-about__arch-detail {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about__tech-figure {
  margin: var(--space-4) 0 0;
}

.page-about__tech-figure img,
.page-about__milestone-figure img,
.page-about__eco-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__tech-figure img {
  aspect-ratio: 8 / 5;
}

.page-about__milestone-figure img {
  aspect-ratio: 2 / 1;
}

.page-about__eco-figure img {
  aspect-ratio: 5 / 3;
}

.page-about__tech-figure figcaption,
.page-about__milestone-figure figcaption,
.page-about__eco-figure figcaption {
  margin-top: var(--space-2);
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

/* Milestones */
.page-about__milestones {
  padding: var(--space-5) 0;
  position: relative;
  overflow: hidden;
}

.page-about__milestones::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -12%;
  width: 200%;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 26px,
    rgba(255, 107, 53, 0.08) 26px,
    rgba(255, 107, 53, 0.08) 28px
  );
  pointer-events: none;
  z-index: 0;
}

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

.page-about__timeline {
  position: relative;
  margin-top: var(--space-4);
  padding-left: var(--space-4);
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--color-accent), var(--color-highlight));
}

.page-about__timeline-item {
  position: relative;
  padding-bottom: var(--space-4);
}

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

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--color-accent);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15);
}

.page-about__timeline-year {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.9rem;
  line-height: 1.1;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.page-about__timeline-content {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3) var(--space-3);
  position: relative;
}

.page-about__timeline-content .tag {
  display: inline-block;
  margin-bottom: var(--space-1);
}

.page-about__timeline-content h3 {
  font-family: var(--font-headline);
  font-size: 1rem;
  color: #F5F0E6;
  margin: var(--space-1) 0 6px;
}

.page-about__timeline-content p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-muted);
  margin: 0;
}

.page-about__milestone-figure {
  margin: var(--space-4) 0 0;
}

/* Ecosystem */
.page-about__eco-grid {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-about__eco-card {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(30, 26, 23, 0.1);
  padding: var(--space-3);
  position: relative;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about__eco-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(11, 27, 61, 0.08);
}

.page-about__eco-index {
  font-family: var(--font-headline);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.55;
  margin-bottom: var(--space-2);
  display: block;
}

.page-about__eco-card h3 {
  font-family: var(--font-headline);
  font-size: 1rem;
  margin: 0 0 6px;
  color: var(--color-text-dark);
}

.page-about__eco-card p {
  font-size: 0.86rem;
  line-height: 1.7;
  margin: 0;
  color: #4A453F;
}

.page-about__eco-bottom {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
  align-items: center;
}

.page-about__cta {
  position: relative;
  background: var(--color-primary);
  color: #F5F0E6;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
}

.page-about__cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--color-accent);
}

.page-about__cta h2 {
  font-family: var(--font-headline);
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 0 0 10px;
  color: #F5F0E6;
}

.page-about__cta p {
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.7;
  margin: 0;
}

.page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.page-about__cta .btn--ghost {
  border-color: rgba(245, 240, 230, 0.4);
  color: #F5F0E6;
}

.page-about__cta .btn--ghost:hover {
  background: rgba(245, 240, 230, 0.08);
  border-color: #F5F0E6;
}

/* Desktop */
@media (min-width: 768px) {
  .page-about__hero {
    padding-top: calc(var(--header-height) + var(--space-5));
    padding-bottom: var(--space-6);
  }

  .page-about__hero h1 {
    font-size: 2.8rem;
  }

  .page-about__hero-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
    align-items: center;
  }

  .page-about__lead {
    font-size: 1.15rem;
  }

  .page-about__stats {
    gap: var(--space-3);
  }

  .page-about__tech-layout {
    grid-template-columns: 5fr 6fr;
    gap: var(--space-5);
    align-items: start;
  }

  .page-about__tech-diagram {
    padding: var(--space-4);
  }

  .page-about__arch-svg {
    min-width: 0;
  }

  .page-about__timeline {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-3);
    padding-left: 0;
  }

  .page-about__timeline::before {
    top: 4px;
    bottom: auto;
    left: 0;
    right: 0;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-highlight));
  }

  .page-about__timeline-item {
    padding-bottom: 0;
    padding-top: var(--space-4);
  }

  .page-about__timeline-item::before {
    left: 24px;
    top: -1px;
  }

  .page-about__timeline-year {
    font-size: 1.4rem;
  }

  .page-about__timeline-content {
    padding-top: var(--space-3);
  }

  .page-about__eco-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

  .page-about__eco-bottom {
    grid-template-columns: 5fr 6fr;
    gap: var(--space-5);
  }

  .page-about__cta {
    padding: var(--space-5);
  }

  .page-about__cta h2 {
    font-size: 1.5rem;
  }
}