.page-about {
  --about-rail: 300px;
  --about-line: 1px solid var(--grid-line);
  background: var(--ink-900);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .about-top {
  padding-top: 20px;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 24px;
  padding-bottom: 40px;
  border-bottom: var(--about-line);
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lake);
}

.page-about .about-kicker::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--lake);
}

.page-about .about-h1 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(32px, 6.4vw, 58px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-lede {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-hero__tags {
  margin: 0;
  padding: 0;
  list-style: none;
  gap: 8px;
}

.page-about .about-hero__media {
  margin: 0;
  border: var(--about-line);
  background: var(--ink-850);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-850);
}

.page-about .about-stat__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1.1;
  color: var(--lake-soft);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ---------- Body split ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-top: 40px;
  padding-bottom: 48px;
}

/* ---------- Timeline rail ---------- */
.page-about .about-rail {
  border-left: 2px solid var(--rule);
  padding-left: 0;
}

.page-about .about-rail__head {
  margin: 0 0 16px;
  padding-left: 20px;
  font-family: var(--font-head);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--yellow);
}

.page-about .about-timeline {
  border-top: var(--about-line);
}

.page-about .about-rail .acc-item {
  position: relative;
  border-bottom: var(--about-line);
}

.page-about .about-rail .acc-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 22px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--lake);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail .acc-item:has([aria-expanded="true"])::before {
  background: var(--yellow);
  border-color: var(--yellow);
}

.page-about .about-tl__trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 0 16px 20px;
  background: none;
  border: 0;
  color: var(--text-dim);
  font-family: var(--font-body);
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-about .about-tl__trigger:hover,
.page-about .about-tl__trigger:focus-visible {
  color: var(--text);
}

.page-about .about-tl__trigger:focus-visible {
  outline: 1px solid var(--lake);
  outline-offset: 2px;
}

.page-about .about-tl__year {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--lake);
}

.page-about .about-tl__trigger[aria-expanded="true"] .about-tl__year {
  color: var(--yellow);
}

.page-about .about-tl__label {
  overflow-wrap: anywhere;
}

.page-about .about-rail .acc-inner {
  padding: 0 0 18px 20px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-rail__note {
  margin: 16px 0 0;
  padding-left: 20px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- Chapters ---------- */
.page-about .about-chapters {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 48px;
  min-width: 0;
}

.page-about .about-chapter {
  border-top: 1px solid var(--rule);
  padding-top: 22px;
}

.page-about .about-chapter__idx {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lake);
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 34px);
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-chapter__lede {
  margin: 0 0 24px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-chapter__foot {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-chapter__foot a {
  color: var(--lake-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-chapter__foot a:hover,
.page-about .about-chapter__foot a:focus-visible {
  border-bottom-color: var(--lake);
  color: var(--text);
}

/* ---------- Pillars ---------- */
.page-about .about-pillars {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-line);
}

.page-about .about-pillar {
  background: var(--ink-850);
  padding: 18px 16px;
  border-top: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-pillar:hover {
  border-top-color: var(--lake);
  background: var(--ink-800);
}

.page-about .about-pillar__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-pillar__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- Ring ---------- */
.page-about .about-ring {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
  padding: 20px 0 4px;
}

.page-about .about-ring__svg {
  display: block;
  width: 100%;
  max-width: 240px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-ring__seg {
  transition: stroke-width var(--dur) var(--ease), opacity var(--dur) var(--ease);
  opacity: 0.92;
}

.page-about .about-ring__seg:hover {
  stroke-width: 24;
  opacity: 1;
}

.page-about .about-ring__seg--a { stroke: var(--lake); }
.page-about .about-ring__seg--b { stroke: var(--lake-soft); }
.page-about .about-ring__seg--c { stroke: var(--yellow); }
.page-about .about-ring__seg--d { stroke: var(--rule); }
.page-about .about-ring__seg--e { stroke: var(--text-dim); }

.page-about .about-ring__core {
  font-family: var(--font-num);
  font-size: 30px;
  fill: var(--text);
}

.page-about .about-ring__core-label {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.14em;
  fill: var(--text-dim);
}

.page-about .about-ring__legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-line);
}

.page-about .about-legend-item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  grid-template-areas:
    "dot name"
    "dot desc";
  column-gap: 12px;
  row-gap: 4px;
  padding: 12px 14px;
  background: var(--ink-850);
}

.page-about .about-legend-item__dot {
  grid-area: dot;
  width: 8px;
  height: 8px;
  margin-top: 6px;
  background: var(--lake);
}

.page-about .about-legend-item__dot--a { background: var(--lake); }
.page-about .about-legend-item__dot--b { background: var(--lake-soft); }
.page-about .about-legend-item__dot--c { background: var(--yellow); }
.page-about .about-legend-item__dot--d { background: var(--rule); }
.page-about .about-legend-item__dot--e { background: var(--text-dim); }

.page-about .about-legend-item__name {
  grid-area: name;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-legend-item__desc {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- Figures ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border: var(--about-line);
  background: var(--ink-850);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85);
}

/* ---------- Teams ---------- */
.page-about .about-team-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-line);
  align-content: start;
}

.page-about .about-team {
  background: var(--ink-850);
  padding: 16px;
}

.page-about .about-team__num {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--yellow);
}

.page-about .about-team__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-team-wrap .about-figure {
  margin: 0;
}

/* ---------- Cooperation ---------- */
.page-about .about-coop {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-line);
}

.page-about .about-coop__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: var(--about-line);
  transition: background var(--dur) var(--ease);
}

.page-about .about-coop__item:hover {
  background: var(--ink-850);
}

.page-about .about-coop__name {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  color: var(--lake-soft);
}

.page-about .about-coop__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-flow {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid-line);
  border: var(--about-line);
}

.page-about .about-flow__step {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px;
  background: var(--ink-850);
  font-size: 14px;
  color: var(--text);
}

.page-about .about-flow__num {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--lake);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  margin-bottom: 56px;
  padding: 28px 22px;
  border: var(--about-line);
  border-left: 3px solid var(--yellow);
  background:
    linear-gradient(180deg, rgba(20, 184, 176, 0.09), rgba(4, 9, 18, 0) 70%),
    var(--ink-850);
}

.page-about .about-cta__kicker {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yellow);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-cta__actions {
  margin: 0;
  padding: 0;
  list-style: none;
  gap: 10px;
}

/* ---------- Desktop ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas:
      "copy media"
      "stats stats";
    align-items: start;
    column-gap: 40px;
    row-gap: 32px;
    padding-top: 40px;
    padding-bottom: 56px;
  }

  .page-about .about-hero__copy { grid-area: copy; }
  .page-about .about-hero__media { grid-area: media; }
  .page-about .about-stats {
    grid-area: stats;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stat__num { font-size: 30px; }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
    padding-top: 52px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .about-chapters { gap: 64px; }

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

  .page-about .about-ring {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    gap: 28px;
    align-items: start;
  }

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

  .page-about .about-coop__item {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta {
    padding: 36px 32px;
    margin-bottom: 72px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-stat {
    padding: 20px 18px;
  }
  .page-about .about-stat__num { font-size: 34px; }
  .page-about .about-chapter__lede { font-size: 17px; }
}
<<<END>>>