.page-about {
  --ab-rail: 128px;
  --ab-gap: clamp(1.2rem, 3.6vw, 3.6rem);
  --ab-gold-line: linear-gradient(180deg, rgba(201, 154, 61, .5), rgba(201, 154, 61, .05));
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.6rem) 0 clamp(2rem, 5vw, 3.4rem);
  background: linear-gradient(180deg, var(--paper-2) 0%, rgba(237, 227, 207, .35) 62%, var(--paper) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: 46%;
  height: 170%;
  background: linear-gradient(160deg, rgba(201, 154, 61, .16), rgba(201, 154, 61, 0) 68%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.4rem, 4vw, 2rem);
  margin-top: clamp(1.1rem, 3vw, 1.9rem);
}

.page-about .hero-title {
  margin: .7rem 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.85rem, 5vw, 3.5rem);
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .hero-title em {
  font-style: normal;
  color: var(--cinnabar);
  display: inline-block;
  border-bottom: 2px solid var(--line-gold);
  padding-bottom: .06em;
}

.page-about .hero-lead {
  margin: 1.1rem 0 0;
  max-width: 35rem;
  font-size: clamp(.98rem, 1.1vw, 1.06rem);
  line-height: 1.9;
  color: rgba(33, 28, 24, .82);
}

.page-about .hero-mark {
  position: relative;
  padding-right: clamp(3.4rem, 9vw, 5.6rem);
}

.page-about .hero-mark__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 12vw, 6.6rem);
  line-height: .86;
  letter-spacing: -.01em;
  color: var(--cinnabar);
}

.page-about .hero-mark__label {
  display: block;
  margin-top: .55rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--ink-green);
}

.page-about .hero-seal {
  position: absolute;
  top: -.3rem;
  right: 0;
  width: clamp(56px, 9vw, 84px);
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  background: var(--cinnabar);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  border: 2px solid var(--gold-warm);
  border-radius: var(--radius);
  transform: rotate(-8deg);
  box-shadow: 0 12px 26px -18px rgba(111, 29, 26, .95);
}

.page-about .chapter-nav {
  display: flex;
  gap: .3rem;
  overflow-x: auto;
  padding: .8rem 0;
  margin-top: clamp(.9rem, 2.6vw, 1.6rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .chapter-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  flex: 0 0 auto;
  padding: .36rem .72rem;
  font-size: .86rem;
  color: var(--ink);
  text-decoration: none;
  border-radius: var(--radius);
  transition: background var(--dur) ease, color var(--dur) ease;
}

.page-about .chapter-nav__index {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .chapter-nav__link:hover,
.page-about .chapter-nav__link:focus-visible {
  background: var(--paper-2);
  outline: none;
}

.page-about .chapter-nav__link.is-active {
  background: var(--cinnabar);
  color: var(--paper);
}

.page-about .chapter-nav__link.is-active .chapter-nav__index {
  color: var(--gold-warm);
}

.page-about .about-body {
  padding-bottom: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .about-chapter {
  display: grid;
  gap: .9rem;
  padding: clamp(1.9rem, 4.5vw, 3.2rem) 0;
  border-top: 1px solid var(--line-soft);
  transition: background var(--dur) ease;
}

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

.page-about .about-chapter.is-active {
  background: linear-gradient(180deg, rgba(231, 201, 126, .14), rgba(231, 201, 126, 0) 72%);
}

.page-about .about-chapter--dark {
  background: var(--ink-green);
  color: var(--paper);
  padding-inline: clamp(.9rem, 2.8vw, 2rem);
}

.page-about .about-chapter--dark.is-active {
  background: var(--ink-green);
}

.page-about .chapter-rail {
  display: flex;
  align-items: center;
  gap: .7rem;
}

.page-about .rail-num {
  font-family: var(--font-display);
  font-size: 1.12rem;
  line-height: 1;
  letter-spacing: .05em;
  color: var(--gold);
}

.page-about .rail-tag {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--sage);
}

.page-about .rail-line {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--line-gold), rgba(201, 154, 61, 0));
}

.page-about .about-chapter--dark .rail-num {
  color: var(--gold-warm);
}

.page-about .about-chapter--dark .rail-tag {
  color: rgba(246, 240, 228, .62);
}

.page-about .about-chapter--dark .rail-line {
  background: linear-gradient(90deg, var(--line-gold), rgba(201, 154, 61, 0));
}

.page-about .chapter-title {
  margin: 0 0 .85rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.42rem, 2.9vw, 2.25rem);
  line-height: 1.32;
  color: inherit;
}

.page-about .chapter-intro {
  max-width: 42rem;
  margin: 0 0 1.2rem;
  font-size: .97rem;
  line-height: 1.85;
  color: rgba(33, 28, 24, .82);
}

.page-about .prose {
  max-width: 41rem;
}

.page-about .prose p {
  margin: 0 0 1rem;
  font-size: .97rem;
  line-height: 1.9;
  color: rgba(33, 28, 24, .84);
}

.page-about .about-chapter--dark .prose p {
  color: rgba(246, 240, 228, .84);
}

.page-about .chapter-cols {
  display: grid;
  gap: 1.4rem;
}

.page-about .chapter-note {
  margin: 1.3rem 0 0;
  padding-left: .9rem;
  border-left: 2px solid var(--gold);
  font-family: var(--font-display);
  font-size: 1.04rem;
  line-height: 1.7;
  color: var(--cinnabar-deep);
}

.page-about .chapter-foot {
  margin: 1.4rem 0 0;
}

.page-about .chapter-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  padding-bottom: .1rem;
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .chapter-link:hover,
.page-about .chapter-link:focus-visible {
  color: var(--cinnabar-deep);
  border-color: var(--cinnabar);
  outline: none;
}

.page-about .about-chapter--dark .chapter-link {
  color: var(--gold-warm);
  border-bottom-color: rgba(231, 201, 126, .5);
}

.page-about .about-chapter--dark .chapter-link:hover,
.page-about .about-chapter--dark .chapter-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-about .media-frame {
  margin: 0;
  padding: .5rem;
  border: 1px solid var(--line-gold);
  background: var(--paper-2);
}

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

.page-about .media-frame__caption {
  padding: .55rem .2rem 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .05em;
  line-height: 1.6;
  color: var(--sage);
}

.page-about .about-chapter--dark .media-frame {
  background: rgba(0, 0, 0, .2);
  border-color: rgba(231, 201, 126, .38);
}

.page-about .about-chapter--dark .media-frame__caption {
  color: rgba(246, 240, 228, .6);
}

.page-about .archive-figure {
  margin-top: 1.4rem;
}

.page-about .principle-grid {
  display: grid;
  gap: 1rem;
  margin-top: .4rem;
}

.page-about .principle-card {
  padding: clamp(1.05rem, 2.4vw, 1.6rem);
  background: var(--card);
}

.page-about .principle-card__no {
  display: block;
  margin-bottom: .55rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .principle-card h3 {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.22rem;
  color: var(--cinnabar);
}

.page-about .principle-card p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: rgba(33, 28, 24, .82);
}

.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem 1rem;
  margin: 1.5rem 0 .4rem;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.2vw, 2.9rem);
  line-height: 1;
  color: var(--gold-warm);
}

.page-about .stat-label {
  display: block;
  margin-top: .45rem;
  font-family: var(--font-mono);
  font-size: .71rem;
  letter-spacing: .1em;
  color: rgba(246, 240, 228, .72);
}

.page-about .contact-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem .8rem;
  margin-top: 1.4rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-soft);
}

.page-about .contact-line {
  font-family: var(--font-mono);
  font-size: .88rem;
  color: var(--ink);
}

.page-about .plan-list {
  display: grid;
  gap: 0;
  margin-top: .5rem;
}

.page-about .plan-item {
  display: grid;
  grid-template-columns: 3.9rem minmax(0, 1fr);
  gap: .85rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.page-about .plan-quarter {
  padding-top: .18rem;
  font-family: var(--font-mono);
  font-size: .71rem;
  letter-spacing: .08em;
  color: var(--cinnabar);
}

.page-about .plan-item h3 {
  margin: 0 0 .35rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  color: var(--ink);
}

.page-about .plan-item p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.8;
  color: rgba(33, 28, 24, .8);
}

.page-about .scene-grid {
  display: grid;
  gap: 1rem;
  margin-top: .4rem;
}

.page-about .scene-card {
  padding: clamp(1.05rem, 2.4vw, 1.5rem);
  background: var(--paper-2);
  border-left: 2px solid var(--gold);
}

.page-about .scene-card h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  line-height: 1.45;
  color: var(--ink-green);
}

.page-about .scene-card p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.82;
  color: rgba(33, 28, 24, .82);
}

.page-about .about-cta {
  margin-top: clamp(1.6rem, 4.5vw, 2.8rem);
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1.1rem, 3vw, 2rem);
  background: var(--paper-2);
  border-top: 2px solid var(--cinnabar);
  display: grid;
  gap: .9rem;
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 44rem;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(33, 28, 24, .82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: .3rem;
}

@media (min-width: 760px) {
  .page-about .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem;
  }

  .page-about .principle-card:nth-child(2) {
    margin-top: 1.8rem;
  }

  .page-about .principle-card:nth-child(3) {
    grid-column: 1 / -1;
    width: min(100%, 34rem);
    margin-top: -.2rem;
  }

  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem 1.3rem;
  }

  .page-about .scene-card:nth-child(even) {
    margin-top: 1.6rem;
  }
}

@media (min-width: 860px) {
  .page-about .about-chapter {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: var(--ab-gap);
  }

  .page-about .chapter-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
  }

  .page-about .rail-num {
    font-size: clamp(1.6rem, 2.4vw, 2.2rem);
  }

  .page-about .rail-tag {
    letter-spacing: .16em;
  }

  .page-about .rail-line {
    width: 1px;
    height: auto;
    min-height: 2.6rem;
    flex: 1 1 auto;
    background: var(--ab-gold-line);
  }

  .page-about .chapter-cols {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    gap: clamp(1.4rem, 3vw, 2.6rem);
  }

  .page-about .stat-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem 1.6rem;
  }

  .page-about .plan-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(1.6rem, 4vw, 3rem);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 2rem;
  }

  .page-about .about-cta h2,
  .page-about .about-cta p {
    grid-column: 1;
  }

  .page-about .about-cta__actions {
    grid-column: 2;
    grid-row: 1 / span 2;
    justify-content: flex-end;
    margin-top: 0;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: end;
    gap: clamp(1.6rem, 4vw, 3rem);
  }

  .page-about .hero-mark {
    padding-bottom: .6rem;
    text-align: right;
  }

  .page-about .hero-mark__label {
    letter-spacing: .24em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-nav__link,
  .page-about .chapter-link,
  .page-about .about-chapter {
    transition: none;
  }
}
<<<END>>>