.page-about {
  --ab-rail-w: 210px;
  --ab-gap: clamp(26px, 4vw, 58px);
  --ab-ink: var(--yy-cream-ink);
}

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--yy-head-h) + clamp(24px, 5vw, 62px));
  padding-bottom: clamp(36px, 6vw, 80px);
  background: linear-gradient(180deg, var(--yy-salt) 0%, var(--yy-salt) 56%, var(--yy-cream) 100%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -34%;
  width: 46vw;
  height: 46vw;
  max-width: 560px;
  max-height: 560px;
  background: radial-gradient(circle at 50% 50%, rgba(207, 226, 232, .78), rgba(207, 226, 232, 0) 68%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .ab-hero__lead { min-width: 0; }

.page-about .ab-hero__title {
  margin: clamp(10px, 1.6vw, 16px) 0 clamp(14px, 2vw, 22px);
  font-family: var(--yy-font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: .035em;
  color: var(--yy-lake-deep);
}

.page-about .ab-hero__lede {
  max-width: 34em;
  color: var(--ab-ink);
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.85;
}

.page-about .ab-hero__actions { margin-top: clamp(20px, 3vw, 30px); }

.page-about .ab-hero__panel {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(8, 63, 82, .16);
  border-radius: var(--yy-radius);
  background: linear-gradient(158deg, rgba(207, 226, 232, .88), rgba(247, 244, 236, .62));
  box-shadow: var(--yy-shadow-soft);
}

.page-about .ab-hero__panelTag {
  margin: 0 0 12px;
  font-family: var(--yy-font-annot);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--yy-lake);
}

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

.page-about .ab-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px dashed rgba(8, 63, 82, .24);
}

.page-about .ab-hero__stat:last-child { border-bottom: 0; }

.page-about .ab-hero__statNum {
  flex: none;
  min-width: 3.2em;
  font-family: var(--yy-font-num);
  font-size: clamp(1.9rem, 5vw, 2.5rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--yy-ochre);
}

.page-about .ab-hero__statLabel {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--yy-lake-deep);
}

.page-about .ab-hero__panelFoot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(8, 63, 82, .16);
  font-family: var(--yy-font-annot);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--yy-rock);
}

.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: clamp(46px, 8vw, 94px);
}

.page-about .ab-rail {
  min-width: 0;
  padding-top: clamp(18px, 4vw, 28px);
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  max-width: 100%;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail__link {
  display: inline-block;
  padding: 7px 13px;
  border-radius: 2px;
  background: rgba(239, 230, 214, .7);
  color: var(--yy-rock);
  font-size: 13.5px;
  letter-spacing: .04em;
  text-decoration: none;
  white-space: nowrap;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--yy-lake-deep);
  background: var(--yy-cream);
}

.page-about .ab-rail__link[aria-current="true"] {
  color: var(--yy-lake-deep);
  background: var(--yy-glass);
  font-weight: 700;
}

.page-about .ab-flow { min-width: 0; }

.page-about .ab-chapter {
  padding: clamp(32px, 5.4vw, 58px) 0;
  border-top: 1px solid var(--yy-line);
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .ab-chapter__title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--yy-font-display);
  font-weight: 800;
  font-size: clamp(1.42rem, 3.5vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: .02em;
  color: var(--yy-lake-deep);
}

.page-about .ab-chapter__no {
  font-family: var(--yy-font-num);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1;
  color: var(--yy-clay);
}

.page-about .ab-p {
  max-width: 38em;
  margin: 0 0 1em;
  color: var(--ab-ink);
  font-size: clamp(15px, 1.2vw, 16.8px);
  line-height: 1.88;
}

.page-about .ab-p--tight {
  margin-top: .8em;
  margin-bottom: 0;
}

.page-about .ab-inline-link {
  color: var(--yy-lake);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible { color: var(--yy-ochre); }

.page-about .ab-list {
  display: grid;
  gap: 13px;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-list li {
  position: relative;
  padding-left: 26px;
  max-width: 38em;
  color: var(--ab-ink);
  font-size: clamp(15px, 1.2vw, 16.5px);
  line-height: 1.82;
}

.page-about .ab-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 12px;
  height: 3px;
  background: var(--yy-ochre);
}

.page-about .ab-list strong {
  color: var(--yy-lake-deep);
  font-weight: 700;
}

.page-about .ab-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 8px;
  border: 1px solid var(--yy-line);
  border-radius: var(--yy-radius);
  background: var(--yy-cream);
}

.page-about .ab-figure--portrait { max-width: 400px; }

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

.page-about .ab-figure__cap {
  padding: 10px 4px 4px;
  font-family: var(--yy-font-annot);
  font-size: 12.8px;
  line-height: 1.78;
  color: var(--yy-rock);
}

.page-about .ab-margin-note {
  max-width: 32em;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 12px 16px;
  border-left: 3px solid var(--yy-clay);
  background: rgba(239, 230, 214, .58);
  font-family: var(--yy-font-annot);
  font-size: 13.8px;
  line-height: 1.82;
  color: var(--yy-rock);
  transform: rotate(-1.3deg);
  transform-origin: left center;
}

.page-about .ab-fold {
  margin-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--yy-line);
  border-bottom: 1px solid var(--yy-line);
}

.page-about .ab-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--yy-font-display);
  font-weight: 700;
  font-size: clamp(15px, 1.4vw, 16.5px);
  color: var(--yy-lake-deep);
}

.page-about .ab-fold summary::-webkit-details-marker { display: none; }

.page-about .ab-fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--yy-font-num);
  font-size: 22px;
  line-height: 1;
  color: var(--yy-ochre);
}

.page-about .ab-fold[open] summary::after { content: "–"; }

.page-about .ab-list--roles { margin-top: 0; padding-bottom: 16px; }

.page-about .ab-chapter--deep {
  margin: clamp(18px, 3vw, 28px) 0;
  padding: clamp(26px, 4.4vw, 46px);
  border-top: 0;
  border-radius: var(--yy-radius);
  background: var(--yy-lake-deep);
  color: var(--yy-salt);
}

.page-about .ab-chapter--deep .ab-chapter__title { color: var(--yy-salt); }

.page-about .ab-chapter--deep .ab-p {
  color: rgba(247, 244, 236, .86);
  max-width: 36em;
}

.page-about .ab-chapter--deep .ab-inline-link {
  color: var(--yy-gold);
}

.page-about .ab-chapter--deep .ab-inline-link:hover,
.page-about .ab-chapter--deep .ab-inline-link:focus-visible {
  color: var(--yy-salt);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(16px, 2.6vw, 26px) 0 clamp(16px, 2.6vw, 24px);
}

.page-about .ab-fact {
  display: grid;
  gap: 5px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(247, 244, 236, .18);
}

.page-about .ab-fact__k {
  font-family: var(--yy-font-annot);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--yy-glass);
}

.page-about .ab-fact__v {
  font-size: clamp(14.5px, 1.4vw, 16.5px);
  line-height: 1.72;
  color: var(--yy-salt);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--yy-line);
  background: var(--yy-line);
}

.page-about .ab-stats__cell {
  padding: 16px 14px;
  background: var(--yy-salt);
}

.page-about .ab-stats__n {
  margin: 0;
  font-family: var(--yy-font-num);
  font-size: clamp(1.55rem, 3.6vw, 2.1rem);
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--yy-lake);
}

.page-about .ab-stats__l {
  margin: 7px 0 0;
  font-size: 12.8px;
  line-height: 1.6;
  color: var(--yy-rock);
}

.page-about .ab-stages {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-stage {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2.2vw, 22px);
  padding: 16px 0;
  border-bottom: 1px dashed var(--yy-line);
}

.page-about .ab-stage:last-child { border-bottom: 0; padding-bottom: 0; }

.page-about .ab-stage__no {
  font-family: var(--yy-font-num);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1;
  color: var(--yy-clay);
}

.page-about .ab-stage__title {
  margin: 0 0 .5em;
  font-family: var(--yy-font-display);
  font-weight: 700;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.55;
  color: var(--yy-lake-deep);
}

.page-about .ab-stage .ab-p { font-size: clamp(14.5px, 1.15vw, 16px); }

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

@media (min-width: 620px) {
  .page-about .ab-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 920px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

@media (min-width: 960px) {
  .page-about .ab-body {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--ab-gap);
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--yy-head-h) + 26px);
    align-self: start;
    padding-top: clamp(32px, 5vw, 54px);
  }

  .page-about .ab-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--yy-line);
  }

  .page-about .ab-rail__link {
    display: block;
    margin-left: -1px;
    padding: 10px 0 10px 16px;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    white-space: normal;
    font-size: 14px;
    line-height: 1.5;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible { background: none; }

  .page-about .ab-rail__link[aria-current="true"] {
    background: none;
    border-left-color: var(--yy-ochre);
    color: var(--yy-lake-deep);
  }

  .page-about .ab-figure--portrait { max-width: 420px; }
}

@media (min-width: 1120px) {
  .page-about .ab-chapter--deep { padding-right: clamp(40px, 5vw, 62px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-margin-note { transform: none; }
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}
<<<END>>>