.page-about {
  background: var(--frost);
  color: var(--graphite);
  overflow-x: clip;
}

.page-about .about-hero {
  background: var(--ink);
  color: var(--frost);
  padding-block: clamp(2.4rem, 6vw, 4.5rem) clamp(2.6rem, 6vw, 5rem);
  border-bottom: 2px solid var(--graphite);
}

.page-about .about-hero__inner {
  display: block;
}

.page-about .about-hero__kicker {
  margin: 0 0 1.4rem;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(2.6rem, 9vw, 5.6rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--frost);
}

.page-about .about-hero__title span {
  display: block;
  color: var(--teal);
}

.page-about .about-hero__lead {
  margin: 1.6rem 0 0;
  max-width: 46ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ice-soft);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.5rem;
  margin: 2.2rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--moss);
}

.page-about .about-fact dt {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.page-about .about-fact dd {
  margin: 0.3rem 0 0;
  font-size: 1.1rem;
  line-height: 1.3;
  color: var(--frost);
}

.page-about .about-fact dd strong {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-layout {
  display: grid;
  gap: 1.5rem;
  padding-block: clamp(1.75rem, 5vw, 3.25rem) clamp(3rem, 7vw, 5rem);
}

.page-about .about-index {
  border: 2px solid var(--graphite);
  background: var(--paper);
  padding: 0.9rem 1rem 1rem;
}

.page-about .about-index__label {
  margin: 0 0 0.65rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--moss);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.35rem 0.55rem;
  border: 2px solid transparent;
  color: var(--graphite);
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-index__num {
  font-size: 0.75rem;
  color: var(--moss);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--graphite);
  background: var(--ice-soft);
  color: var(--ink);
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

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

.page-about .about-chapter {
  padding-block: clamp(1.9rem, 5vw, 3rem);
  border-top: 2px solid var(--hair);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
}

.page-about .about-chapter__num {
  margin: 0;
  flex: none;
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-size: clamp(1.45rem, 4vw, 2.1rem);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .about-lead {
  margin: 1rem 0 0;
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--graphite);
}

.page-about .about-cols {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.75rem;
}

.page-about .about-prose p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  max-width: 60ch;
}

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

.page-about .about-aside {
  margin: 1.5rem 0 0;
  padding-left: 0.9rem;
  border-left: 3px solid var(--ice);
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--moss);
}

.page-about .about-prose .about-aside {
  margin-top: 1.4rem;
}

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

.page-about .about-figure--wide {
  margin-top: 1.9rem;
}

.page-about .about-figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--moss);
}

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

.page-about .about-folds {
  margin-top: 1.6rem;
  border-top: 2px solid var(--graphite);
}

.page-about .about-folds--tight {
  margin-top: 0;
}

.page-about .about-fold {
  border-bottom: 2px solid var(--graphite);
  background: var(--paper);
}

.page-about .about-fold__trigger {
  display: flex;
  width: 100%;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  border: 0;
  background: none;
  font: inherit;
  font-weight: 700;
  font-size: 0.96rem;
  line-height: 1.5;
  text-align: left;
  color: var(--graphite);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-fold__trigger::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  color: var(--amber);
}

.page-about .about-fold[data-open] .about-fold__trigger::after {
  content: "－";
}

.page-about .about-fold__trigger:hover {
  background: var(--ice-soft);
}

.page-about .about-fold__trigger:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: -2px;
}

.page-about .about-fold__panel {
  display: none;
  padding: 0 1rem 1rem;
}

.page-about .about-fold[data-open] .about-fold__panel {
  display: block;
}

.page-about .about-fold__panel p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--graphite);
  max-width: 62ch;
}

.page-about .about-timeline {
  position: relative;
  margin: 1.9rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.32rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: var(--hair);
}

.page-about .about-node {
  position: relative;
  padding-left: 2.1rem;
  padding-bottom: 1.7rem;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--frost), 0 0 0 4px var(--amber);
}

.page-about .about-node__year {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--deep-blue);
}

.page-about .about-node__title {
  margin: 0.15rem 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.45;
  transition: color var(--dur) var(--ease);
}

.page-about .about-node__text {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .about-node:hover .about-node__title {
  color: var(--deep-blue);
}

.page-about .about-chapter--dark {
  margin-block: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.6rem, 4vw, 2.6rem);
  background: var(--ink);
  border-top: 2px solid var(--ink);
  color: var(--frost);
}

.page-about .about-chapter--dark .about-chapter__num {
  color: var(--amber);
}

.page-about .about-chapter--dark h2 {
  color: var(--frost);
}

.page-about .about-chapter--dark .about-lead {
  color: var(--ice-soft);
}

.page-about .about-duty {
  display: grid;
  gap: 0.9rem;
  margin: 1.7rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-duty li {
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--teal);
  background: rgba(255, 255, 255, 0.04);
}

.page-about .about-duty__name {
  margin: 0 0 0.3rem;
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--teal);
}

.page-about .about-duty__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--ice-soft);
}

.page-about .about-aside--dark {
  margin-top: 1.6rem;
  border-left-color: var(--amber);
  color: var(--ice-soft);
}

.page-about .about-audience {
  display: grid;
  gap: 0;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--hair);
}

.page-about .about-audience__item {
  display: grid;
  gap: 0.35rem;
  padding: 1.1rem 0;
  border-bottom: 2px solid var(--hair);
}

.page-about .about-audience__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-audience__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--graphite);
  max-width: 56ch;
}

.page-about .about-audience__link {
  justify-self: start;
  font-size: 0.9rem;
  font-weight: 700;
}

.page-about .about-chapter--next {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.5rem, 4vw, 2.4rem);
  border: 2px solid var(--graphite);
  background: var(--ice);
  box-shadow: var(--shadow-hard);
  border-top: 2px solid var(--graphite);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .about-chapter--next .about-aside {
  border-left-color: var(--graphite);
  color: var(--ink);
}

@media (min-width: 48rem) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-duty {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-audience__item {
    grid-template-columns: 13rem minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 1rem 1.5rem;
  }

  .page-about .about-audience__link {
    justify-self: end;
  }
}

@media (min-width: 60rem) {
  .page-about .about-layout {
    grid-template-columns: 12.5rem minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    width: 100%;
    white-space: normal;
  }

  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(1.8rem, 3.5vw, 2.8rem);
    align-items: start;
  }

  .page-about .about-cols--reverse {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .about-node {
    padding-left: 2.6rem;
    padding-bottom: 2rem;
  }
}
</main>