.page-about {
  --about-menu-w: 220px;
  --about-gap: 48px;
}

.page-about .breadcrumb {
  padding: 20px 0 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
}

.page-about .page-hero {
  padding: 36px 0 44px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--c-line);
  position: relative;
}

.page-about .page-hero::after {
  content: '';
  display: block;
  width: 108px;
  height: 3px;
  background: var(--c-green);
  margin-top: 28px;
}

.page-about .page-hero__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-gray);
}

.page-about .page-hero__title {
  margin: 0 0 16px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--c-white);
  max-width: 720px;
}

.page-about .page-hero__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-gray);
  max-width: 640px;
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-bottom: 72px;
  position: relative;
}

.page-about .about-layout::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-menu,
.page-about .about-body {
  position: relative;
  z-index: 1;
}

.page-about .about-menu {
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px;
}

.page-about .about-menu__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-menu__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-green);
}

.page-about .about-menu__code {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--c-gray);
}

.page-about .about-menu__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-menu__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-menu__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--c-gray);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .about-menu__link:hover,
.page-about .about-menu__link:focus-visible {
  color: var(--c-green);
  border-color: var(--c-line-strong);
  background: var(--c-green-glass);
}

.page-about .about-menu__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-blue);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-section {
  padding: 44px 0;
  border-top: 1px solid var(--c-line);
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-section:first-of-type {
  border-top: none;
  padding-top: 16px;
}

.page-about .about-section:target .section-title {
  color: var(--c-green);
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .section-head__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-blue);
  white-space: nowrap;
}

.page-about .section-head__kicker::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--c-line);
}

.page-about .section-title {
  margin: 0;
  font-size: 26px;
  line-height: 1.3;
  color: var(--c-white);
}

.page-about .about-story__content {
  color: var(--c-gray);
}

.page-about .about-story__content p {
  margin: 0 0 16px;
  line-height: 1.8;
}

.page-about .about-figure {
  margin: 24px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--c-line);
  background: var(--c-card);
}

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

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

.page-about .about-figure--team img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.page-about .data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.page-about .data-card {
  padding: 24px;
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .data-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-line-strong);
  box-shadow: var(--shadow);
}

.page-about .data-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-green);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.page-about .data-card__unit {
  font-size: 18px;
  color: var(--c-blue);
}

.page-about .data-card__label {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 8px;
}

.page-about .data-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
}

.page-about .data-extra {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 4px;
}

.page-about .data-extra__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  background: var(--c-card-2);
  border: 1px solid var(--c-line);
}

.page-about .data-extra__label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-gray);
}

.page-about .data-extra__value {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-white);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 32px;
  position: relative;
}

.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-green), var(--c-blue));
  opacity: 0.5;
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .timeline__mark {
  position: absolute;
  left: -32px;
  top: 20px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 3px solid var(--c-green);
}

.page-about .timeline__body {
  padding: 20px;
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: 14px;
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .timeline__body:hover {
  border-color: var(--c-line-strong);
  transform: translateX(4px);
}

.page-about .timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-green);
  background: var(--c-green-glass);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .cert-card {
  position: relative;
  padding: 26px 24px 24px;
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 24px;
  width: 88px;
  height: 4px;
  background: var(--c-blue);
}

.page-about .cert-card .tag {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-red);
  background: var(--c-red-bg);
}

.page-about .cert-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .cert-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .partner-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .partner-wrap .prose {
  color: var(--c-gray);
}

.page-about .partner-wrap .prose p {
  margin: 0 0 16px;
  line-height: 1.8;
}

.page-about .partner-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

@media (min-width: 700px) {
  .page-about .data-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 880px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-menu-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-menu {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-menu__list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }

  .page-about .about-menu__link {
    padding: 10px 14px;
    width: 100%;
  }

  .page-about .data-extra {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .page-about .partner-wrap {
    grid-template-columns: minmax(0, 420px) 1fr;
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .data-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}