.page-about {
  --about-gutter: clamp(1.15rem, 4vw, 2rem);
  --about-line: rgba(170, 184, 200, 0.16);
  background: var(--ink-950);
  color: var(--slate-300);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(900px 520px at 88% -20%, rgba(69, 224, 209, 0.13), transparent 62%),
    radial-gradient(700px 460px at 0% 110%, rgba(246, 169, 59, 0.10), transparent 60%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-850) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline-end: -8%;
  top: 0;
  width: 46%;
  height: 130%;
  background: repeating-linear-gradient(
    102deg,
    transparent 0 46px,
    rgba(255, 107, 69, 0.07) 46px 48px
  );
  transform: rotate(8deg);
  pointer-events: none;
}

.page-about .breadcrumbs {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--slate-300);
  margin-block-end: clamp(2rem, 5vw, 3.5rem);
}

.page-about .breadcrumbs a {
  color: var(--cyan-400);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

.page-about .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
}

.page-about .eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber-400);
}

.page-about h1 {
  margin: 0 0 1.35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 7vw, 4.1rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--cream-100);
}

.page-about h1 br {
  display: none;
}

.page-about .hero-lede {
  max-width: 40em;
  margin: 0 0 1.75rem;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.9;
  color: var(--slate-300);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .hero-index {
  border: 1px solid var(--ink-700);
  background: rgba(15, 29, 49, 0.78);
  padding: 1.15rem 1.15rem 1.35rem;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .index-head {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--cyan-400);
}

.page-about .index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.15rem;
}

.page-about .index-list a {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.7rem;
  align-items: center;
  padding: 0.5rem 0.45rem;
  border-radius: 4px;
  text-decoration: none;
  color: var(--slate-300);
  transition: background 140ms var(--ease), color 140ms var(--ease), transform 140ms var(--ease);
}

.page-about .index-list a:hover,
.page-about .index-list a:focus-visible {
  background: rgba(69, 224, 209, 0.1);
  color: var(--cream-100);
  transform: translateX(3px);
}

.page-about .index-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  color: var(--amber-400);
}

.page-about .index-title {
  font-size: 0.9rem;
  line-height: 1.4;
}

/* ---- chapters ---- */
.page-about .chapter {
  padding-block: clamp(2.75rem, 6vw, 5rem);
  border-top: 1px solid var(--ink-700);
  scroll-margin-top: 104px;
}

.page-about .chapter-grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .chapter-rail {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-block-end: 0.35rem;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber-400);
}

.page-about .chapter-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--slate-300);
  text-transform: uppercase;
}

.page-about .chapter-title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.2vw, 2.35rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--cream-100);
}

.page-about .chapter-lede {
  max-width: 40em;
  margin: 0 0 1.9rem;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--slate-300);
}

.page-about .chapter-body p {
  line-height: 1.88;
}

/* ---- 01 origin ---- */
.page-about .origin-grid {
  display: grid;
  gap: 1.75rem;
  align-items: start;
}

.page-about .origin-text p {
  margin: 0 0 1.1rem;
  font-size: 0.97rem;
  color: var(--slate-300);
}

.page-about .stat-strip {
  display: grid;
  gap: 0.6rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stat-strip li {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.7rem 0.9rem;
  background: var(--ink-850);
  border-inline-start: 3px solid var(--cyan-400);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .stat-cap {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--slate-300);
}

.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .media-caption {
  margin-block-start: 0.65rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--slate-300);
}

.page-about .origin-figure {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .timeline-figure {
  margin-block-end: 2rem;
}

/* ---- 02 timeline ---- */
.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.6rem;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  inset-block: 0.4rem;
  inset-inline-start: 0.32rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-400), var(--amber-400) 55%, var(--coral-500));
}

.page-about .tl-item {
  position: relative;
  padding-block-end: 1.6rem;
}

.page-about .tl-item:last-child {
  padding-block-end: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  inset-inline-start: -1.6rem;
  inset-block-start: 0.5rem;
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--cyan-400);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.3rem, 3.4vw, 1.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber-400);
  margin-block-end: 0.6rem;
}

.page-about .tl-card {
  padding: 0.95rem 1rem;
  background: var(--ink-850);
  border-inline-start: 2px solid var(--ink-700);
}

.page-about .tl-card h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cream-100);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--slate-300);
}

/* ---- 03 crew ---- */
.page-about .crew-chart {
  margin-block-end: 1.75rem;
}

.page-about .crew-svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .crew-bar {
  transition: opacity 160ms var(--ease);
}

.page-about .crew-bar--edit { fill: var(--cyan-400); }
.page-about .crew-bar--check { fill: var(--amber-400); }
.page-about .crew-bar--dev { fill: var(--coral-500); }

.page-about .crew-cards {
  display: grid;
  gap: 0.75rem;
}

.page-about .crew-card {
  background: var(--cream-050);
  color: var(--ink-950);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about .crew-card summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.95rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
}

.page-about .crew-card summary::-webkit-details-marker {
  display: none;
}

.page-about .crew-card summary:focus-visible {
  outline: 2px solid var(--amber-ink);
  outline-offset: -3px;
}

.page-about .crew-swatch {
  width: 0.68rem;
  height: 0.68rem;
  flex: none;
}

.page-about .crew-swatch--edit { background: var(--cyan-400); }
.page-about .crew-swatch--check { background: var(--amber-400); }
.page-about .crew-swatch--dev { background: var(--coral-500); }

.page-about .crew-name {
  flex: 1 1 auto;
  font-size: 1rem;
  color: var(--ink-950);
}

.page-about .crew-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--amber-ink);
}

.page-about .crew-card summary::after {
  content: "＋";
  font-size: 0.95rem;
  color: var(--amber-ink);
  margin-inline-start: 0.35rem;
}

.page-about .crew-card[open] summary::after {
  content: "－";
}

.page-about .crew-card-body {
  padding: 0 1.1rem 1.15rem;
}

.page-about .crew-card-body p {
  margin: 0 0 0.65rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: #2b3a4d;
}

.page-about .crew-card-body p:last-child {
  margin-block-end: 0;
}

.page-about .crew-collab {
  padding-inline-start: 0.8rem;
  border-inline-start: 2px solid var(--amber-400);
  font-size: 0.85rem !important;
  color: var(--amber-ink) !important;
}

/* ---- 04 workflow ---- */
.page-about .flow-grid {
  display: grid;
  gap: 1.75rem;
  align-items: start;
}

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

.page-about .flow-step {
  position: relative;
  padding: 1rem 1rem 1rem 3.1rem;
  border: 1px solid var(--ink-700);
  background: linear-gradient(90deg, rgba(69, 224, 209, 0.05), transparent 55%);
}

.page-about .flow-num {
  position: absolute;
  inset-inline-start: 0.9rem;
  inset-block-start: 1rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--coral-500);
}

.page-about .flow-step h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cream-100);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--slate-300);
}

.page-about .flow-step a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .flow-figure {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

/* ---- 05 scenes ---- */
.page-about .scene-grid {
  display: grid;
  gap: 0.9rem;
}

.page-about .scene-card {
  padding: 1.15rem 1.1rem;
  background: var(--ink-850);
  border-block-start: 2px solid var(--ink-700);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .scene-tag {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--cyan-400);
}

.page-about .scene-card h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--cream-100);
}

.page-about .scene-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--slate-300);
}

.page-about .scene-more {
  margin: 1.5rem 0 0;
}

.page-about .inline-link {
  color: var(--amber-400);
  font-size: 0.92rem;
  text-decoration: none;
  border-block-end: 1px solid rgba(246, 169, 59, 0.45);
  padding-block-end: 2px;
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--cream-100);
  border-block-end-color: var(--cream-100);
}

/* ---- 06 credentials ---- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-block-end: 0.85rem;
}

.page-about .filter-btn {
  padding: 0.42rem 0.9rem;
  border: 1px solid var(--ink-700);
  background: transparent;
  color: var(--slate-300);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  border-radius: 999px;
  cursor: pointer;
  transition: background 140ms var(--ease), color 140ms var(--ease), border-color 140ms var(--ease);
}

.page-about .filter-btn:hover,
.page-about .filter-btn:focus-visible {
  border-color: var(--cyan-400);
  color: var(--cream-100);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--amber-400);
  border-color: var(--amber-400);
  color: var(--ink-950);
  font-weight: 700;
}

.page-about .filter-status {
  margin: 0 0 1.15rem;
  min-height: 1.2em;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--slate-300);
}

.page-about .cred-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.page-about .cred-seal {
  padding: 1rem 1.05rem;
  background: var(--ink-850);
  border-inline-start: 2px solid var(--amber-400);
}

.page-about .cred-mark {
  display: inline-block;
  margin-block-end: 0.55rem;
  padding: 0.15rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--ink-950);
  background: var(--cream-050);
}

.page-about .cred-seal h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--cream-100);
}

.page-about .cred-seal p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--slate-300);
}

/* ---- 07 join ---- */
.page-about .chapter--paper {
  background: var(--cream-050);
  color: var(--ink-950);
  border-top-color: transparent;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .chapter--paper .chapter-num {
  color: var(--amber-ink);
}

.page-about .chapter--paper .chapter-label {
  color: var(--amber-ink);
}

.page-about .chapter--paper .chapter-title {
  color: var(--ink-950);
}

.page-about .join-lede {
  max-width: 40em;
  margin: 0 0 1.6rem;
  font-size: 0.98rem;
  line-height: 1.85;
  color: #2b3a4d;
}

.page-about .join-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-block-end: 1.75rem;
}

.page-about .chapter--paper .btn--quiet {
  border: 1px solid var(--amber-ink);
  color: var(--amber-ink);
}

.page-about .join-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.6rem;
}

.page-about .join-links a {
  display: block;
  padding: 0.85rem 1rem;
  background: rgba(255, 248, 234, 0.85);
  border: 1px solid rgba(138, 75, 0, 0.22);
  text-decoration: none;
  transition: transform 140ms var(--ease), border-color 140ms var(--ease);
}

.page-about .join-links a:hover,
.page-about .join-links a:focus-visible {
  transform: translateX(4px);
  border-color: var(--amber-ink);
}

.page-about .join-link-title {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink-950);
}

.page-about .join-link-desc {
  display: block;
  margin-block-start: 0.25rem;
  font-size: 0.82rem;
  color: #4a5a6d;
}

@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.5rem;
  }

  .page-about .stat-strip li {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    border-inline-start: 3px solid var(--cyan-400);
  }

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

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

  .page-about .join-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about h1 br {
    display: inline;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    gap: 3.5rem;
  }

  .page-about .chapter-grid {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 2.75rem;
  }

  .page-about .chapter-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .chapter-num {
    font-size: 2.6rem;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 2.25rem;
  }

  .page-about .flow-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 2.25rem;
  }

  .page-about .timeline {
    padding-inline-start: 1.9rem;
  }

  .page-about .tl-item::before {
    inset-inline-start: -1.9rem;
  }
}

@media (min-width: 1100px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .page-about .chapter-grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 3.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-list a,
  .page-about .filter-btn,
  .page-about .join-links a,
  .page-about .crew-bar {
    transition: none;
  }

  .page-about .index-list a:hover,
  .page-about .index-list a:focus-visible,
  .page-about .join-links a:hover,
  .page-about .join-links a:focus-visible {
    transform: none;
  }
}
<<<END>>>