.page-about {
  --about-grid: rgba(31, 31, 31, 0.05);
  background-color: var(--color-paper);
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--color-rock);
  overflow-x: hidden;
}

.page-about .about-cover {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-top: 40px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-cover__title {
  font-size: clamp(40px, 8vw, 72px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0 0 20px;
}

.page-about .about-cover__lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-ink);
  max-width: 58ch;
  margin: 0 0 16px;
}

.page-about .about-cover__desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-rock);
  max-width: 58ch;
  margin: 0 0 28px;
}

.page-about .about-cover__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  box-shadow: 0 6px 28px rgba(31, 31, 31, 0.05);
}

.page-about .about-fact-card {
  background: var(--color-paper);
  padding: 24px 22px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-fact-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--color-moss);
}

.page-about .about-fact-card:nth-child(4n)::before {
  background: var(--color-clay);
}

.page-about .about-fact-card__num {
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-card__label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-rock);
}

.page-about .about-section {
  padding-top: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--color-line-soft);
}

.page-about .about-section .section-title {
  margin-bottom: 40px;
}

.page-about .about-section .section-title__index {
  color: var(--color-clay);
  font-variant-numeric: tabular-nums;
}

.page-about .about-origin__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-origin__text p {
  line-height: 1.9;
  margin-bottom: 1em;
  font-size: 16px;
}

.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin__media {
  position: relative;
}

.page-about .about-origin__frame {
  margin: 0;
  border: 1px solid var(--color-line);
  background: var(--color-white);
}

.page-about .about-origin__frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-origin__caption {
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-rock);
  text-align: right;
  background: var(--color-white);
}

.page-about .about-note {
  position: relative;
  z-index: 1;
  margin: -20px 0 0 32px;
  background-color: rgba(245, 242, 235, 0.96);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-moss);
  padding: 16px 20px 16px 52px;
  box-shadow: 0 4px 16px rgba(31, 31, 31, 0.05);
}

.page-about .about-note__index {
  position: absolute;
  left: 16px;
  top: 14px;
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--color-moss);
  line-height: 1;
}

.page-about .about-note p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-rock);
}

.page-about .about-journey__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}

.page-about .about-timeline {
  position: relative;
  padding: 4px 0;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--color-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 44px;
  margin-bottom: 20px;
}

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

.page-about .about-timeline__summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  padding: 14px 0;
}

.page-about .about-timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__summary::before {
  content: '';
  position: absolute;
  left: -38px;
  top: 50%;
  transform: translateY(-50%);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-paper);
  border: 2px solid var(--color-moss);
  transition: background 0.2s ease;
}

.page-about .about-timeline__item[open] .about-timeline__summary::before {
  background: var(--color-moss);
}

.page-about .about-timeline__summary::after {
  content: '+';
  margin-left: auto;
  font-size: 20px;
  line-height: 1;
  font-weight: 300;
  color: var(--color-clay);
}

.page-about .about-timeline__item[open] .about-timeline__summary::after {
  content: '−';
}

.page-about .about-timeline__version {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-moss);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.01em;
}

.page-about .about-timeline__year {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-rock);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__detail {
  padding: 4px 0 14px;
}

.page-about .about-timeline__detail p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-rock);
  border-left: 1px solid var(--color-line);
  padding-left: 16px;
}

.page-about .about-journey__figure {
  margin: 0;
  border: 1px solid var(--color-line);
  background: var(--color-white);
}

.page-about .about-journey__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-journey__caption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-rock);
  background: var(--color-white);
}

.page-about .about-governance__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-governance__copy p {
  line-height: 1.9;
  margin-bottom: 1em;
  font-size: 16px;
}

.page-about .about-governance__copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-governance__side {
  display: grid;
  gap: 24px;
}

.page-about .about-governance__frame {
  margin: 0;
  border: 1px solid var(--color-line);
  background: var(--color-white);
}

.page-about .about-governance__frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-governance__caption {
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-rock);
}

.page-about .about-governance__facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  margin: 0;
}

.page-about .about-governance__fact {
  background: var(--color-paper);
  padding: 18px 16px;
  text-align: center;
}

.page-about .about-governance__fact dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-rock);
  margin-bottom: 8px;
  font-weight: 500;
}

.page-about .about-governance__fact dd {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  color: var(--color-clay);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.page-about .about-ecosystem__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-ecosystem__intro p {
  line-height: 1.9;
  margin-bottom: 1em;
  font-size: 16px;
}

.page-about .about-ecosystem__intro p:last-child {
  margin-bottom: 0;
}

.page-about .about-ecosystem__side {
  display: grid;
  gap: 24px;
}

.page-about .about-ecosystem__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.page-about .about-ecosystem__stat {
  background: var(--color-paper);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-ecosystem__stat-num {
  font-size: 32px;
  font-weight: 900;
  color: var(--color-porcelain);
  letter-spacing: -0.02em;
  line-height: 1;
}

.page-about .about-ecosystem__stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-rock);
  letter-spacing: 0.04em;
}

.page-about .about-ecosystem__certs {
  border: 1px solid var(--color-line);
  background: var(--color-white);
  padding: 24px;
}

.page-about .about-ecosystem__certs h3 {
  margin: 0 0 16px;
  font-size: 17px;
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-ecosystem__certs h3::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-line);
}

.page-about .about-ecosystem__certs ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-ecosystem__certs li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--color-line-soft);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-rock);
}

.page-about .about-ecosystem__certs li:last-child {
  border-bottom: 0;
}

.page-about .about-ecosystem__certs li span {
  font-weight: 700;
  color: var(--color-porcelain);
  white-space: nowrap;
}

.page-about .about-contents {
  padding-top: 56px;
  padding-bottom: 64px;
}

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

.page-about .about-content-link {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 24px 22px;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
  text-decoration: none;
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.page-about .about-content-link:hover,
.page-about .about-content-link:focus-visible {
  background-color: rgba(74, 107, 93, 0.05);
  box-shadow: 0 8px 24px rgba(31, 31, 31, 0.06);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-content-link:focus-visible {
  outline: 2px solid var(--color-clay);
  outline-offset: 2px;
}

.page-about .about-content-link__index {
  font-family: var(--font-serif);
  font-size: 28px;
  line-height: 1;
  color: var(--color-clay);
}

.page-about .about-content-link__text {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-content-link__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--color-moss);
  font-weight: 800;
  text-transform: uppercase;
}

.page-about .about-content-link__title {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-ink);
  font-weight: 600;
}

@media (min-width: 800px) {
  .page-about .about-contents__inner {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-journey__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 48px;
  }

  .page-about .about-governance__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
  }

  .page-about .about-ecosystem__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-cover {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 64px;
    align-items: center;
  }
}