.page-about {
  --about-gutter: clamp(1rem, 4vw, 2.5rem);
  --about-rail: 220px;
  position: relative;
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  padding-top: clamp(2rem, 6vw, 4rem);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
  position: relative;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(760px, 88vw);
  height: min(760px, 88vw);
  background:
    radial-gradient(circle at 40% 40%, rgba(255, 59, 92, .22), transparent 62%),
    radial-gradient(circle at 68% 68%, rgba(47, 216, 255, .16), transparent 58%),
    radial-gradient(circle at 22% 74%, rgba(162, 89, 255, .18), transparent 60%);
  filter: blur(4px);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}
.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 3.5rem);
  margin-top: 1.5rem;
}
.page-about .hero-copy {
  max-width: 46ch;
}
.page-about .hero-copy .eyebrow {
  color: var(--neon);
  letter-spacing: .18em;
  font-size: .74rem;
  margin-bottom: .9rem;
}
.page-about .hero-copy h1 {
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  line-height: 1.04;
  margin: 0 0 1.2rem;
  letter-spacing: -.01em;
}
.page-about .hero-copy .lede {
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  line-height: 1.9;
  color: var(--paper);
  opacity: .9;
  margin: 0 0 1.8rem;
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-bottom: 2.2rem;
}
.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem 1.4rem;
  margin: 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}
.page-about .hero-facts dt {
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: .35rem;
}
.page-about .hero-facts dd {
  margin: 0;
  font-size: .98rem;
  color: var(--paper);
  font-weight: 700;
}
.page-about .hero-figure {
  margin: 0;
  position: relative;
}
.page-about .hero-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid rgba(162, 89, 255, .35);
  box-shadow: 0 0 0 1px rgba(47, 216, 255, .12), 0 28px 60px -30px rgba(162, 89, 255, .55);
  object-fit: cover;
}
.page-about .hero-figure .figure-caption {
  margin-top: .8rem;
  font-size: .8rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- BODY LAYOUT ---------- */
.page-about .about-body {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--about-gutter) clamp(3rem, 9vw, 6rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .chapter-rail {
  display: none;
}
.page-about .chapter-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(3.5rem, 10vw, 7rem);
}

/* ---------- CHAPTER SKELETON ---------- */
.page-about .chapter-head {
  max-width: 62ch;
  margin-bottom: clamp(1.8rem, 4vw, 3rem);
}
.page-about .chapter-num {
  font-size: .84rem;
  letter-spacing: .22em;
  color: var(--neon);
  margin: 0 0 .8rem;
}
.page-about .chapter-num::after {
  content: "";
  display: inline-block;
  width: 48px;
  height: 2px;
  margin-left: .9rem;
  vertical-align: middle;
  background: linear-gradient(90deg, var(--neon), transparent);
}
.page-about .chapter-head .serif-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.28;
  color: var(--paper);
  margin: 0 0 1rem;
  letter-spacing: .01em;
}
.page-about .chapter-lede {
  color: var(--muted);
  line-height: 1.9;
  font-size: 1rem;
  margin: 0;
}
.page-about .text-link {
  color: var(--neon);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 216, 255, .4);
  padding-bottom: 2px;
  transition: border-color .2s ease, color .2s ease;
}
.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- PRINCIPLES ---------- */
.page-about .principle-stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}
.page-about .principle-card {
  position: relative;
  padding: clamp(1.4rem, 3.4vw, 2.2rem);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--grape);
  border-radius: var(--radius);
  clip-path: var(--cut);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.page-about .principle-card[data-tags="melon"] { border-left-color: var(--melon); }
.page-about .principle-card[data-tags="orange"] { border-left-color: var(--orange); }
.page-about .principle-card[data-tags="lime"] { border-left-color: var(--lime); }
.page-about .principle-card:hover {
  transform: rotate(-1.2deg) translateY(-3px);
  border-color: rgba(47, 216, 255, .45);
  box-shadow: 0 0 26px -10px rgba(47, 216, 255, .5);
}
.page-about .principle-card[data-tags="melon"]:hover { box-shadow: 0 0 26px -10px rgba(255, 59, 92, .6); }
.page-about .principle-card[data-tags="orange"]:hover { box-shadow: 0 0 26px -10px rgba(255, 194, 61, .6); }
.page-about .principle-card[data-tags="lime"]:hover { box-shadow: 0 0 26px -10px rgba(92, 230, 92, .6); }
.page-about .principle-index {
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--muted);
  margin: 0 0 .7rem;
}
.page-about .principle-card[data-tags="melon"] .principle-index { color: var(--melon); }
.page-about .principle-card[data-tags="orange"] .principle-index { color: var(--orange); }
.page-about .principle-card[data-tags="lime"] .principle-index { color: var(--lime); }
.page-about .principle-card h3 {
  font-size: clamp(1.2rem, 3.4vw, 1.5rem);
  margin: 0 0 .8rem;
  color: var(--paper);
}
.page-about .principle-card p {
  margin: 0 0 .8rem;
  line-height: 1.85;
  color: var(--paper);
  opacity: .88;
  font-size: .96rem;
}
.page-about .principle-tip {
  margin: 0;
  padding-top: .8rem;
  border-top: 1px dashed var(--line);
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- FIELDS ---------- */
.page-about .chapter--fields .field-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .field-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(47, 216, 255, .28);
  background: var(--panel);
}
.page-about .field-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .field-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .9rem;
}
.page-about .field-item {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
}
.page-about .field-item--melon { border-color: rgba(255, 59, 92, .45); }
.page-about .field-item--orange { border-color: rgba(255, 194, 61, .45); }
.page-about .field-key {
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--neon);
  display: block;
  margin-bottom: .5rem;
}
.page-about .field-item--melon .field-key { color: var(--melon); }
.page-about .field-item--orange .field-key { color: var(--orange); }
.page-about .field-item h3 {
  font-size: 1.05rem;
  margin: 0 0 .45rem;
  color: var(--paper);
}
.page-about .field-item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- SCENES ---------- */
.page-about .scene {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--panel);
  margin-bottom: 1.4rem;
  clip-path: var(--cut);
}
.page-about .scene:last-of-type { margin-bottom: 0; }
.page-about .scene--a { background: linear-gradient(150deg, rgba(255, 59, 92, .10), var(--panel) 58%); }
.page-about .scene--b { background: linear-gradient(150deg, rgba(92, 230, 92, .10), var(--panel) 58%); }
.page-about .scene--c { background: linear-gradient(150deg, rgba(162, 89, 255, .12), var(--panel) 58%); }
.page-about .scene-copy h3 {
  font-size: clamp(1.25rem, 3.6vw, 1.65rem);
  margin: .7rem 0 .9rem;
  color: var(--paper);
}
.page-about .scene-copy p {
  margin: 0 0 .9rem;
  line-height: 1.9;
  color: var(--paper);
  opacity: .88;
  font-size: .96rem;
}
.page-about .scene-figure {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line);
}
.page-about .scene-figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}
.page-about .scene-badge {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  align-self: start;
  padding: 1.2rem 1.3rem;
  border: 1px solid rgba(92, 230, 92, .45);
  border-radius: var(--radius-sm);
  background: rgba(14, 15, 26, .68);
}
.page-about .scene-badge .mono {
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--lime);
}
.page-about .scene-badge strong {
  font-size: clamp(2rem, 7vw, 2.8rem);
  color: var(--paper);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.page-about .scene-note {
  align-self: start;
  padding: 1.2rem 1.3rem;
  border-left: 3px solid var(--grape);
  background: rgba(14, 15, 26, .6);
  border-radius: var(--radius-sm);
}
.page-about .scene-note .mono {
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--grape);
  margin: 0 0 .5rem;
}
.page-about .scene-note p:last-child {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- TIMELINE ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.6rem;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(92, 230, 92, .18));
}
.page-about .timeline-node {
  position: relative;
  padding: 0 0 clamp(1.8rem, 5vw, 2.8rem);
}
.page-about .timeline-node:last-child { padding-bottom: 0; }
.page-about .timeline-dot {
  position: absolute;
  left: calc(-1.6rem - 5px);
  top: .5rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 12px rgba(92, 230, 92, .8);
}
.page-about .timeline-when {
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--lime);
  margin: 0 0 .5rem;
}
.page-about .timeline-node h3 {
  font-size: clamp(1.1rem, 3.2vw, 1.4rem);
  margin: 0 0 .6rem;
  color: var(--paper);
}
.page-about .timeline-node p {
  margin: 0;
  line-height: 1.9;
  color: var(--muted);
  font-size: .95rem;
  max-width: 60ch;
}

/* ---------- Q&A ---------- */
.page-about .qa-list {
  display: grid;
  gap: .8rem;
}
.page-about .qa-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  overflow: hidden;
  transition: border-color .2s ease;
}
.page-about .qa-item[open] {
  border-color: rgba(47, 216, 255, .4);
}
.page-about .qa-item summary {
  display: flex;
  align-items: flex-start;
  gap: .9rem;
  padding: 1.1rem 1.2rem;
  cursor: pointer;
  list-style: none;
}
.page-about .qa-item summary::-webkit-details-marker { display: none; }
.page-about .qa-mark {
  flex: none;
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--neon);
  padding-top: .2rem;
}
.page-about .qa-q {
  font-weight: 700;
  color: var(--paper);
  line-height: 1.6;
  font-size: .98rem;
}
.page-about .qa-a {
  padding: 0 1.2rem 1.2rem 1.2rem;
  border-top: 1px solid var(--line);
  margin-top: 0;
}
.page-about .qa-a p {
  margin: 1rem 0 0;
  line-height: 1.9;
  color: var(--muted);
  font-size: .93rem;
}

/* ---------- CTA ---------- */
.page-about .chapter--cta { margin-top: 1rem; }
.page-about .cta-panel {
  padding: clamp(1.8rem, 5vw, 3rem);
  border-radius: var(--radius);
  border: 1px solid rgba(47, 216, 255, .35);
  background:
    radial-gradient(circle at 82% 22%, rgba(255, 194, 61, .18), transparent 55%),
    radial-gradient(circle at 12% 82%, rgba(255, 59, 92, .18), transparent 55%),
    var(--panel-2);
  clip-path: var(--cut);
  text-align: left;
}
.page-about .cta-panel .chapter-num { color: var(--orange); }
.page-about .cta-panel .chapter-num::after { background: linear-gradient(90deg, var(--orange), transparent); }
.page-about .cta-panel .serif-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4.4vw, 2.2rem);
  color: var(--paper);
  margin: 0 0 .8rem;
  line-height: 1.3;
}
.page-about .cta-panel p {
  margin: 0 0 1.6rem;
  color: var(--paper);
  opacity: .88;
  line-height: 1.85;
  max-width: 52ch;
}
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
}

/* ---------- TABLET ---------- */
@media (min-width: 720px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
  .page-about .principle-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem;
  }
  .page-about .chapter--fields .field-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    gap: 2.4rem;
  }
  .page-about .field-figure { position: sticky; top: 84px; }
  .page-about .scene--a {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    align-items: center;
  }
  .page-about .scene--b {
    grid-template-columns: minmax(0, 1fr) minmax(0, .5fr);
    align-items: start;
  }
  .page-about .scene--c {
    grid-template-columns: minmax(0, 1fr) minmax(0, .6fr);
    align-items: start;
  }
}

/* ---------- DESKTOP ---------- */
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }
  .page-about .chapter-rail {
    display: block;
    position: sticky;
    top: 88px;
    padding-right: 1rem;
  }
  .page-about .rail-title {
    font-size: .7rem;
    letter-spacing: .22em;
    color: var(--muted);
    margin: 0 0 1rem;
  }
  .page-about .rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: .1rem;
    border-left: 1px solid var(--line);
  }
  .page-about .rail-list a {
    display: flex;
    gap: .7rem;
    align-items: baseline;
    padding: .55rem .8rem;
    color: var(--muted);
    text-decoration: none;
    font-size: .88rem;
    line-height: 1.5;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: color .2s ease, border-color .2s ease, background .2s ease;
  }
  .page-about .rail-list a .mono {
    font-size: .68rem;
    color: rgba(154, 160, 180, .7);
  }
  .page-about .rail-list a:hover,
  .page-about .rail-list a:focus-visible {
    color: var(--paper);
    border-left-color: var(--neon);
    background: rgba(47, 216, 255, .06);
  }
  .page-about .rail-list a.is-visible {
    color: var(--paper);
    border-left-color: var(--melon);
    background: rgba(255, 59, 92, .08);
  }
  .page-about .rail-list a.is-visible .mono { color: var(--melon); }

  .page-about .principle-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem;
  }
  .page-about .chapter-head {
    margin-left: clamp(0rem, 2vw, 2rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle-card,
  .page-about .rail-list a {
    transition: none;
  }
  .page-about .principle-card:hover {
    transform: none;
  }
}
<<<END>>>