.page-about {
  background:
    linear-gradient(90deg, rgba(108, 59, 209, 0.055) 1px, transparent 1px) 0 0 / 88px 88px,
    linear-gradient(rgba(108, 59, 209, 0.035) 1px, transparent 1px) 0 0 / 88px 88px;
  color: var(--pearl);
}

.page-about img {
  max-width: 100%;
}

.page-about .about-intro {
  padding-top: 36px;
  padding-bottom: 56px;
}

.page-about .breadcrumb {
  margin-bottom: 36px;
}

.page-about .display {
  margin: 16px 0 22px;
  font-size: clamp(2.45rem, 7.6vw, 6.2rem);
  font-weight: 200;
  line-height: 0.98;
  letter-spacing: -0.035em;
}

.page-about .display em {
  font-style: italic;
  font-weight: 800;
  color: var(--violet-mist);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0;
  color: var(--fog);
  font-size: 1.04rem;
  line-height: 1.8;
}

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

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--hair);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.06);
}

.page-about .about-stamp {
  position: absolute;
  left: 16px;
  bottom: 16px;
  display: grid;
  gap: 3px;
  padding: 10px 16px;
  background: var(--violet);
  color: var(--pearl);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .about-stamp .mono {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--pearl);
}

.page-about .about-stamp span:last-child {
  font-size: 0.82rem;
}

.page-about .about-section {
  padding: 64px 0;
  border-top: 1px solid var(--hair);
}

.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .section-head h2 {
  max-width: 20ch;
  margin: 4px 0 0;
  font-size: clamp(1.8rem, 4.2vw, 3.3rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.page-about .section-lede {
  max-width: 58ch;
  margin: 14px 0 0;
  color: var(--fog);
  line-height: 1.75;
}

.page-about .origin-layout {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .prose p {
  margin: 0 0 16px;
  color: var(--fog);
  line-height: 1.8;
}

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

.page-about .prose a {
  color: var(--violet-mist);
}

.page-about .origin-aside {
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--hair);
}

.page-about .aside-label {
  margin: 0 0 10px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

.page-about .plain-list li {
  position: relative;
  padding: 12px 0 12px 20px;
  border-bottom: 1px solid var(--hair);
  color: var(--fog);
  font-size: 0.92rem;
  line-height: 1.65;
}

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

.page-about .plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 6px;
  height: 6px;
  background: var(--violet);
}

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

.page-about .version-visual {
  height: 210px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--hair);
}

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

.page-about .era-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 36px;
  padding-left: 22px;
}

.page-about .era-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--hair);
}

.page-about .era-item {
  position: relative;
}

.page-about .era-item::after {
  content: "";
  position: absolute;
  left: -16px;
  top: 30px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.page-about .era-details {
  background: var(--panel);
  border: 1px solid var(--hair);
  transition: border-color 180ms var(--ease);
}

.page-about .era-details[open] {
  border-color: var(--violet);
}

.page-about .era-details > summary {
  position: relative;
  display: block;
  padding: 20px 48px 20px 20px;
  cursor: pointer;
  list-style: none;
}

.page-about .era-details > summary::-webkit-details-marker {
  display: none;
}

.page-about .era-details > summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 18px;
  color: var(--violet-mist);
  font-family: var(--font-mono);
  font-size: 1.3rem;
  line-height: 1;
}

.page-about .era-details[open] > summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .era-summary {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: start;
}

.page-about .era-num {
  color: var(--violet-mist);
  font-size: 1.6rem;
  font-style: italic;
  font-weight: 700;
  line-height: 1;
}

.page-about .era-tag {
  display: block;
  margin-bottom: 6px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .era-title {
  display: block;
  color: var(--pearl);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .era-lead {
  display: block;
  margin-top: 8px;
  color: var(--fog);
  font-size: 0.9rem;
  line-height: 1.65;
}

.page-about .era-body {
  padding: 16px 20px 22px;
  border-top: 1px solid var(--hair);
}

.page-about .era-body p {
  margin: 0;
  color: var(--fog);
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-about .era-body p + p {
  margin-top: 10px;
}

.page-about .process-layout {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

.page-about .process-visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--hair);
}

.page-about .process-visual img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

.page-about .process-lede {
  margin: 0 0 24px;
  color: var(--pearl);
  font-size: 1.02rem;
  line-height: 1.8;
}

.page-about .process-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--hair);
}

.page-about .process-list li {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 0 0 26px 20px;
}

.page-about .process-list li::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--cyan);
}

.page-about .process-num {
  color: var(--violet-mist);
  font-size: 0.86rem;
  line-height: 1.5;
}

.page-about .process-list h3 {
  margin: 0 0 6px;
  font-size: 1.04rem;
  font-weight: 600;
}

.page-about .process-list p {
  margin: 0;
  color: var(--fog);
  font-size: 0.92rem;
  line-height: 1.72;
}

.page-about .team-fact {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
  padding: 20px;
  background: var(--layer);
  border: 1px solid var(--hair);
}

.page-about .team-fact p {
  flex-basis: 100%;
  margin: 4px 0 0;
  color: var(--fog);
  font-size: 0.9rem;
  line-height: 1.72;
}

.page-about .data-ribbon {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(210px, 80vw);
  gap: 0;
  margin-top: 30px;
  overflow-x: auto;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--violet) var(--panel);
}

.page-about .data-cell {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 150px;
  padding: 24px 22px;
  border-right: 1px solid var(--hair);
  background: linear-gradient(160deg, rgba(108, 59, 209, 0.12), transparent 62%);
  scroll-snap-align: start;
}

.page-about .data-cell:last-child {
  border-right: 0;
}

.page-about .data-num {
  color: var(--cyan);
  font-size: clamp(2.2rem, 7vw, 3.6rem);
  font-style: italic;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
}

.page-about .data-label {
  max-width: 18ch;
  color: var(--fog);
  font-size: 0.86rem;
  line-height: 1.6;
}

.page-about .scale-note {
  max-width: 62ch;
  margin: 22px 0 0;
  color: var(--fog);
  line-height: 1.8;
}

.page-about .eco-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .eco-card {
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--hair);
}

.page-about .eco-card h3 {
  margin: 10px 0;
  font-size: 1.16rem;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .eco-card p {
  margin: 0;
  color: var(--fog);
  line-height: 1.75;
}

.page-about .eco-kicker {
  color: var(--violet-mist);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .eco-card--accent {
  background: linear-gradient(150deg, rgba(108, 59, 209, 0.24), var(--panel) 62%);
  border-color: var(--violet);
}

.page-about .eco-card--accent h3 {
  max-width: 19ch;
}

.page-about .eco-foot {
  margin: 24px 0 0;
  color: var(--fog);
  line-height: 1.75;
}

.page-about .eco-foot a {
  color: var(--violet-mist);
}

.page-about .about-next {
  padding-top: 16px;
  padding-bottom: 96px;
}

.page-about .about-next-panel {
  position: relative;
  display: grid;
  gap: 28px;
  overflow: hidden;
  padding: 30px 24px;
  background: linear-gradient(135deg, rgba(108, 59, 209, 0.3), var(--panel) 56%, var(--ink));
  border: 1px solid var(--violet);
}

.page-about .about-next-panel::before {
  content: "";
  position: absolute;
  top: -64px;
  right: -64px;
  width: 180px;
  height: 180px;
  border: 1px solid var(--violet);
  transform: rotate(24deg);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-next h2 {
  margin: 4px 0 14px;
  font-size: clamp(1.8rem, 4.2vw, 3rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.page-about .about-next p {
  max-width: 56ch;
  margin: 0 0 20px;
  color: var(--fog);
  line-height: 1.8;
}

.page-about .about-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-refresh {
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--cyan);
}

.page-about .about-refresh p {
  margin: 8px 0 12px;
}

.page-about .about-refresh a {
  color: var(--cyan);
  font-size: 0.88rem;
}

@media (min-width: 900px) {
  .page-about .about-intro {
    padding-top: 60px;
    padding-bottom: 76px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.8fr);
    gap: clamp(40px, 6vw, 88px);
    align-items: center;
  }

  .page-about .about-hero-figure {
    transform: translateY(16px);
  }

  .page-about .about-section {
    padding: 96px 0;
  }

  .page-about .origin-layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.8fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .origin-aside {
    margin-top: 4px;
  }

  .page-about .versions-head {
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .version-visual {
    height: 300px;
  }

  .page-about .era-track {
    padding-left: 0;
    gap: 0;
  }

  .page-about .era-track::before {
    left: 50%;
    top: 0;
    bottom: 0;
  }

  .page-about .era-item {
    width: calc(50% - 42px);
    margin-bottom: 28px;
  }

  .page-about .era-item:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .era-item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .era-item:nth-child(odd)::after {
    right: -45px;
    left: auto;
  }

  .page-about .era-item:nth-child(even)::after {
    left: -45px;
    right: auto;
  }

  .page-about .era-body {
    padding-left: 78px;
  }

  .page-about .process-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .process-visual {
    position: sticky;
    top: 32px;
  }

  .page-about .data-ribbon {
    grid-auto-columns: 1fr;
    overflow-x: visible;
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-next-panel {
    grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.65fr);
    gap: 48px;
    padding: 48px 44px;
    align-items: start;
  }

  .page-about .about-next {
    padding-bottom: 120px;
  }
}

@media (max-width: 520px) {
  .page-about .about-intro {
    padding-top: 24px;
  }

  .page-about .breadcrumb {
    margin-bottom: 24px;
  }

  .page-about .era-details > summary {
    padding-right: 40px;
  }

  .page-about .era-summary {
    grid-template-columns: 34px 1fr;
    gap: 10px;
  }

  .page-about .era-num {
    font-size: 1.3rem;
  }

  .page-about .process-list li {
    grid-template-columns: 34px 1fr;
    gap: 10px;
    padding-left: 16px;
  }
}
<<<END>>>