.page-about {
  --about-num: 84px;
  --about-note: 262px;
  --about-gap: clamp(22px, 4vw, 54px);
  background-color: var(--paper);
  color: var(--rock);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-cover {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(34px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: -18px -24px 0;
  pointer-events: none;
  background:
    radial-gradient(58% 72% at 88% 6%, rgba(201, 168, 106, 0.16), transparent 68%),
    radial-gradient(48% 62% at 2% 92%, rgba(79, 124, 120, 0.1), transparent 70%),
    repeating-linear-gradient(0deg, rgba(63, 70, 72, 0.045) 0 1px, transparent 1px 5px);
}

.page-about .about-cover__intro,
.page-about .about-cover__index {
  position: relative;
  z-index: 1;
}

.page-about .about-cover h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2rem, 5.6vw, 3.9rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin: 14px 0 0;
  max-width: 13em;
}

.page-about .about-cover__lede {
  margin: 22px 0 0;
  max-width: 30em;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  color: var(--rock);
}

.page-about .cover-index {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .cover-index__link {
  display: grid;
  grid-template-columns: 2.8em minmax(0, 1fr);
  gap: 2px 14px;
  padding: 12px 6px 12px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--rock);
  transition: background-color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .cover-index__link:hover,
.page-about .cover-index__link:focus-visible {
  background-color: var(--celadon);
  padding-left: 12px;
}

.page-about .cover-index__num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  padding-top: 0.35em;
}

.page-about .cover-index__name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.06rem;
  color: var(--ink);
}

.page-about .cover-index__note {
  grid-column: 2;
  font-size: 0.86rem;
  color: var(--rock);
  opacity: 0.82;
}

.page-about .about-chapter {
  padding: clamp(40px, 7vw, 88px) 0;
}

.page-about .about-chapter--tint {
  background-color: var(--sand);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr);
  gap: 0 var(--about-gap);
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .chapter-no {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--gold);
  border-top: 2px solid var(--gold);
  padding-top: 10px;
}

.page-about .chapter-head h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.1vw, 2.1rem);
  line-height: 1.34;
  color: var(--ink);
  margin: 0;
}

.page-about .chapter-kicker {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--clay);
  margin: 10px 0 0;
}

.page-about .chapter-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .chapter-main p {
  margin: 0 0 1.05em;
  max-width: 36em;
}

.page-about .chapter-lede {
  font-size: 1.02rem;
  color: var(--rock);
  border-left: 2px solid var(--line);
  padding-left: 16px;
}

.page-about .chapter-side {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .side-note {
  margin: 0;
  border-left: 2px solid var(--gold);
  padding: 4px 0 4px 16px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .side-note__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--clay);
  margin-bottom: 6px;
}

.page-about .side-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .side-list__item {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--rock);
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .five-map {
  width: 100%;
  max-width: 240px;
  height: auto;
}

.page-about .five-map .map-lines path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .five-map .map-dots circle {
  fill: var(--paper);
  stroke: var(--gold);
  stroke-width: 2.5;
}

.page-about .five-map .map-labels text {
  font-family: var(--font-sans);
  font-size: 10px;
  fill: var(--rock);
}

.page-about .about-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 2px;
  background-color: var(--sand);
}

.page-about .about-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--clay);
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.page-about .principles {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .principle {
  width: 100%;
  background-color: var(--paper);
  border-left: 4px solid var(--gold);
  transition: background-color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .principle[open] {
  background-color: var(--celadon);
  border-left-color: var(--river);
}

.page-about .principle > summary {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr) 1.4em;
  align-items: center;
  gap: 0 12px;
  padding: 16px 16px 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .principle-no {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .principle[open] .principle-no {
  color: var(--river);
}

.page-about .principle-name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.06rem;
  color: var(--ink);
  line-height: 1.5;
}

.page-about .principle-mark::before {
  content: "+";
  display: block;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--clay);
}

.page-about .principle[open] .principle-mark::before {
  content: "–";
  color: var(--river);
}

.page-about .principle-body {
  padding: 0 20px 20px 18px;
}

.page-about .principle-body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--rock);
  max-width: 38em;
}

.page-about .team-figures {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-figure {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.page-about .team-figure dt {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.32rem;
  color: var(--ink);
  line-height: 1.3;
}

.page-about .team-figure dd {
  margin: 4px 0 0;
  font-size: 0.86rem;
  color: var(--rock);
}

.page-about .timeline {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background-color: var(--line);
}

.page-about .milestone {
  position: relative;
  padding-left: 44px;
  outline-offset: 4px;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--paper);
  border: 2px solid var(--gold);
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .milestone::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  background: linear-gradient(225deg, transparent 0 50%, var(--gold) 50%);
  opacity: 0.85;
  opacity: 0.85;
}

.page-about .milestone-card {
  position: relative;
  background-color: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 22px 18px;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  transition: background-color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .milestone:hover .milestone-card,
.page-about .milestone:focus-within .milestone-card {
  background-color: var(--celadon);
  border-color: var(--river);
}

.page-about .milestone:hover::before,
.page-about .milestone:focus-within::before {
  background-color: var(--river);
  transform: scale(1.15);
}

.page-about .milestone-era {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .milestone-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.5;
  color: var(--ink);
  margin: 6px 0 0;
}

.page-about .milestone-note {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--rock);
  transition: max-height 0.26s var(--ease), opacity 0.2s var(--ease), margin-top 0.2s var(--ease);
}

.page-about .milestone:hover .milestone-note,
.page-about .milestone:focus-within .milestone-note {
  max-height: 260px;
  opacity: 1;
  margin-top: 10px;
}

.page-about .companion-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .companion {
  background-color: var(--paper);
  border-top: 3px solid var(--gold);
  padding: 24px 24px 22px;
}

.page-about .companion--firm {
  background-color: var(--celadon);
  border-top-color: var(--river);
}

.page-about .companion-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.18rem;
  line-height: 1.5;
  color: var(--ink);
  margin: 0 0 12px;
}

.page-about .companion-text {
  margin: 0 0 18px;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .companion-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--river);
  text-decoration: none;
  border-bottom: 1px solid var(--river);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .companion-link:hover,
.page-about .companion-link:focus-visible {
  color: var(--goji);
  border-bottom-color: var(--goji);
}

.page-about .about-next {
  background-color: var(--rock);
  color: var(--paper);
  padding: clamp(42px, 7vw, 82px) 0;
}

.page-about .about-next .eyebrow {
  color: var(--gold);
}

.page-about .about-next__head h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.38;
  color: var(--paper);
  margin: 12px 0 0;
  max-width: 22em;
}

.page-about .about-next__lede {
  margin: 14px 0 0;
  max-width: 30em;
  color: rgba(251, 248, 240, 0.82);
  font-size: 0.98rem;
}

.page-about .next-links {
  margin-top: clamp(24px, 4vw, 38px);
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .next-link {
  display: block;
  padding: 18px 20px;
  border: 1px solid rgba(251, 248, 240, 0.26);
  text-decoration: none;
  color: var(--paper);
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background-color: rgba(251, 248, 240, 0.1);
  border-color: var(--gold);
}

.page-about .next-link__title {
  display: block;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.04rem;
  line-height: 1.5;
}

.page-about .next-link__note {
  display: block;
  margin-top: 4px;
  font-size: 0.84rem;
  color: rgba(251, 248, 240, 0.72);
}

@media (max-width: 899px) {
  .page-about .milestone-note {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }

  .page-about .principle-name {
    font-size: 1rem;
  }
}

@media (min-width: 720px) {
  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .companion-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .page-about .team-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .chapter-head {
    grid-template-columns: var(--about-num) minmax(0, 1fr);
  }

  .page-about .chapter-grid {
    grid-template-columns: minmax(0, 1fr) var(--about-note);
  }

  .page-about .chapter-side {
    position: sticky;
    top: 96px;
  }

  .page-about .principle:nth-child(1) {
    width: 100%;
  }

  .page-about .principle:nth-child(2) {
    width: 92%;
    margin-inline-start: auto;
  }

  .page-about .principle:nth-child(3) {
    width: 97%;
  }

  .page-about .principle:nth-child(4) {
    width: 88%;
    margin-inline-start: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .milestone-note {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }

  .page-about .cover-index__link,
  .page-about .principle,
  .page-about .milestone-card,
  .page-about .milestone-note,
  .page-about .milestone::before,
  .page-about .next-link,
  .page-about .companion-link {
    transition: none;
  }
}
<<<END>>>