.page-about {
  --about-prose: 38em;
  --about-rail-top: 108px;
}

.page-about .mission-shell {
  display: flex;
  flex-direction: column;
  gap: clamp(26px, 4vw, 46px);
  padding-block: clamp(22px, 3.4vw, 38px) clamp(56px, 8vw, 96px);
}

.page-about .breadcrumb {
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .mission-head {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 62rem;
}

.page-about .mission-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(44px, 8vw, 104px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--bone);
}

.page-about .mission-lead {
  margin: 0;
  max-width: var(--about-prose);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--bone);
  opacity: 0.86;
}

/* ---------- hero figure ---------- */
.page-about .mission-hero {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  isolation: isolate;
}

.page-about .mission-hero img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .mission-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 64%;
  background: linear-gradient(180deg, rgba(10, 12, 16, 0) 0%, rgba(110, 10, 28, 0.58) 54%, rgba(10, 12, 16, 0.95) 100%);
  pointer-events: none;
  z-index: 1;
}

.page-about .mission-hero figcaption {
  position: absolute;
  left: clamp(18px, 3vw, 34px);
  right: clamp(18px, 3vw, 34px);
  bottom: clamp(16px, 2.4vw, 26px);
  z-index: 2;
  font-size: 14px;
  line-height: 1.6;
  color: var(--bone);
  opacity: 0.86;
}

/* ---------- split layout ---------- */
.page-about .mission-layout {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

.page-about .mission-rail {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

.page-about .rail-mark {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .rail-claim {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--bone);
}

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

.page-about .rail-link {
  display: block;
  padding: 8px 0 8px 16px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .rail-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .mission-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(46px, 6vw, 84px);
  min-width: 0;
}

/* ---------- block rhythm ---------- */
.page-about .mission-block {
  position: relative;
  min-width: 0;
}

.page-about .mission-block::before {
  content: "";
  position: absolute;
  top: calc(-1 * clamp(23px, 3vw, 42px));
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--crimson) 0%, var(--crimson-deep) 40%, rgba(36, 42, 53, 0) 100%);
  opacity: 0.85;
}

.page-about .mission-block:first-child::before {
  display: none;
}

.page-about .block-eyebrow {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--crimson-bright);
}

.page-about .mission-block .section-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.18;
  font-weight: 800;
  color: var(--bone);
}

.page-about .mission-block .section-lead {
  margin: 0 0 24px;
  max-width: var(--about-prose);
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .mission-flow .prose {
  max-width: var(--about-prose);
}

.page-about .mission-flow .prose p {
  margin: 0 0 1.1em;
  font-size: 17px;
  line-height: 1.9;
  color: var(--bone);
  opacity: 0.9;
}

.page-about .mission-flow .prose p:last-child {
  margin-bottom: 0;
}

.page-about .mission-flow .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 227, 200, 0.42);
}

.page-about .mission-flow .prose a:hover,
.page-about .mission-flow .prose a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- timeline ---------- */
.page-about .path-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .path-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--crimson-bright) 0%, var(--crimson) 30%, var(--crimson-deep) 70%, rgba(36, 42, 53, 0) 100%);
}

.page-about .path-node {
  position: relative;
  min-width: 0;
}

.page-about .path-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 23px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--crimson-bright);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .path-detail {
  padding-left: 46px;
}

.page-about .path-detail summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  border-radius: 8px;
  transition: color 0.22s var(--ease);
}

.page-about .path-detail summary::-webkit-details-marker {
  display: none;
}

.page-about .path-detail summary::marker {
  content: "";
}

.page-about .path-detail summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-size: 20px;
  line-height: 1;
  color: var(--slate);
  transition: color 0.22s var(--ease);
}

.page-about .path-detail summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .path-index {
  flex: none;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--slate);
  transition: color 0.22s var(--ease);
}

.page-about .path-heading {
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 800;
  line-height: 1.5;
  color: var(--bone);
}

.page-about .path-detail p {
  margin: 0 0 20px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .path-detail[open] summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .path-detail[open] .path-index {
  color: var(--orange);
}

.page-about .path-node:has(.path-detail[open])::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(38, 227, 200, 0.14);
}

/* ---------- team ---------- */
.page-about .team-layout {
  display: grid;
  gap: 22px;
}

.page-about .team-layout .media-frame {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .team-layout .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

.page-about .team-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  min-width: 0;
}

.page-about .team-card {
  padding: 22px 20px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: rgba(38, 227, 200, 0.45);
  transform: translateY(-3px);
}

.page-about .team-num {
  margin: 0 0 12px;
  font-size: 26px;
  line-height: 1;
  color: var(--slate);
  transition: color 0.25s var(--ease);
}

.page-about .team-card:hover .team-num,
.page-about .team-card:focus-within .team-num {
  color: var(--cyan);
}

.page-about .team-name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- pipeline ---------- */
.page-about .pipe-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .pipe-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 20px 20px 18px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--crimson);
}

.page-about .pipe-num {
  padding-top: 2px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--orange);
}

.page-about .pipe-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .pipe-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .pipe-figure {
  margin: 22px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .pipe-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- scale ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .scale-cell {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: clamp(20px, 2.6vw, 30px) clamp(16px, 2vw, 24px);
  background: var(--panel);
}

.page-about .scale-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--orange);
}

.page-about .scale-label {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- next ---------- */
.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  max-width: 40em;
}

.page-about .next-list li {
  position: relative;
  padding-left: 26px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--bone);
  opacity: 0.9;
}

.page-about .next-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 12px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-about .mission-tail {
  margin-top: 28px;
  padding: 24px clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(176, 16, 44, 0.24) 0%, rgba(10, 12, 16, 0.92) 72%);
}

.page-about .mission-tail p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--bone);
  opacity: 0.88;
}

.page-about .mission-tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(38, 227, 200, 0.42);
}

.page-about .mission-tail a:hover,
.page-about .mission-tail a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- responsive ---------- */
@media (min-width: 620px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .mission-layout {
    grid-template-columns: minmax(216px, 272px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .mission-rail {
    position: sticky;
    top: var(--about-rail-top);
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-num,
  .page-about .path-index,
  .page-about .path-detail summary,
  .page-about .path-detail summary::after,
  .page-about .path-node::before,
  .page-about .rail-link {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}
<<<END>>>