.page-about {
  --about-gap: clamp(28px, 5vw, 60px);
  --about-hair: rgba(74, 85, 78, .5);
  --about-cream-ink: rgba(11, 18, 16, .76);
  background: var(--ink);
  color: var(--cold);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 18px;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  color: var(--cold-50);
}

.page-about .crumb {
  color: var(--cold-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .crumb:hover,
.page-about .crumb:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

.page-about .crumb[aria-current="page"] {
  color: var(--yellow);
}

.page-about .crumb-sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(20px, 4vw, 46px) 0 clamp(36px, 6vw, 76px);
  background:
    radial-gradient(120% 80% at 84% -4%, rgba(125, 255, 196, .16), transparent 62%),
    radial-gradient(90% 70% at 6% 104%, rgba(183, 110, 78, .2), transparent 60%),
    linear-gradient(172deg, var(--ink) 0%, var(--ink-2) 44%, var(--green) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(242, 247, 243, .045) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(242, 247, 243, .045) 0 1px, transparent 1px 64px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.35rem, 8.4vw, 5.1rem);
  line-height: .96;
  letter-spacing: -.03em;
  color: var(--cold);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 22px 0 0;
  font-size: clamp(.98rem, 1.6vw, 1.125rem);
  line-height: 1.68;
  color: var(--cold-70);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.page-about .about-hero__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px;
  background: rgba(11, 18, 16, .76);
}

.page-about .about-hero__cell--wide {
  grid-column: span 2;
}

.page-about .about-hero__cell .data-cell__label {
  font-size: var(--fs-xs);
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--cold-50);
}

.page-about .about-hero__cell .data-cell__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.1;
  color: var(--mint);
}

.page-about .about-hero__cell--wide .data-cell__value {
  color: var(--yellow);
}

/* ---------- 索引 + 章节 ---------- */
.page-about .about-archive {
  display: grid;
  gap: var(--about-gap);
  padding: clamp(30px, 5.5vw, 68px) 0 clamp(40px, 7vw, 88px);
}

.page-about .about-index {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--yellow);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0;
  font-size: var(--fs-s);
  color: var(--cold-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index__list .num {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--yellow);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

.page-about .about-index__note {
  display: none;
  margin: 18px 0 0;
  padding: 12px 14px;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--cold-50);
  border-left: 2px solid var(--yellow);
  background: rgba(242, 194, 48, .07);
}

.page-about .about-section {
  scroll-margin-top: 96px;
}

.page-about .about-section + .about-section {
  margin-top: clamp(44px, 7vw, 92px);
  padding-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-section__no {
  font-family: var(--font-mono);
  font-size: var(--fs-s);
  letter-spacing: .12em;
  color: var(--yellow);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.55rem, 3.4vw, 2.45rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--cold);
}

.page-about .about-section .prose {
  max-width: 62ch;
  margin-top: 18px;
  color: var(--cold-70);
}

.page-about .about-section .prose p {
  margin: 0 0 14px;
  font-size: clamp(.95rem, 1.4vw, 1.0625rem);
  line-height: 1.74;
}

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

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--rock);
  border: 1px solid var(--line-soft);
}

.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--cold-50);
}

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

/* ---------- 团队 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-crew__card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: rgba(44, 52, 48, .5);
  border: 1px solid var(--line-soft);
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .about-crew__card:hover {
  border-color: var(--mint);
  background: rgba(44, 52, 48, .72);
}

.page-about .about-crew__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1;
  color: var(--mint);
}

.page-about .about-crew__role {
  margin: 0;
  font-size: var(--fs-m);
  font-weight: 600;
  color: var(--cold);
}

.page-about .about-crew__card .card__text {
  margin: 0;
  font-size: var(--fs-s);
  line-height: 1.7;
  color: var(--cold-50);
}

.page-about .about-rhythm {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-rhythm li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink-2);
}

.page-about .about-rhythm__key {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .1em;
  color: var(--yellow);
}

.page-about .about-rhythm__text {
  margin: 0;
  font-size: var(--fs-s);
  line-height: 1.7;
  color: var(--cold-70);
}

/* ---------- 时间线 ---------- */
.page-about .about-era {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: 30px;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 28px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--tl-tint, var(--mint));
  box-shadow: 0 0 0 3px var(--ink);
  transition: transform .25s var(--ease);
}

.page-about .tl-item:hover::before {
  transform: scale(1.5);
}

.page-about .tl-item--era1 { --tl-tint: var(--clay); }
.page-about .tl-item--era2 { --tl-tint: var(--yellow); }
.page-about .tl-item--era3 { --tl-tint: var(--mint); }
.page-about .tl-item--era4 { --tl-tint: var(--cold); }

.page-about .tl-item__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .12em;
  color: var(--tl-tint, var(--mint));
}

.page-about .tl-item__title {
  margin: 6px 0 6px;
  font-size: var(--fs-l);
  font-weight: 600;
  line-height: 1.35;
  color: var(--cold);
}

.page-about .tl-item__text {
  margin: 0;
  max-width: 52ch;
  font-size: var(--fs-s);
  line-height: 1.75;
  color: var(--cold-50);
  transition: color .25s var(--ease);
}

.page-about .tl-item:hover .tl-item__text {
  color: var(--cold-70);
}

.page-about .about-era__aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-era__aside .about-figure {
  margin-top: 0;
}

.page-about .about-era__link {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .08em;
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(125, 255, 196, .45);
  align-self: flex-start;
  padding-bottom: 3px;
}

.page-about .about-era__link:hover,
.page-about .about-era__link:focus-visible {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner {
  padding: 20px 18px;
  background: rgba(18, 59, 46, .5);
  border: 1px solid var(--line-soft);
  border-top-width: 2px;
}

.page-about .about-partner--clay { border-top-color: var(--clay); }
.page-about .about-partner--mint { border-top-color: var(--mint); }
.page-about .about-partner--yellow { border-top-color: var(--yellow); }

.page-about .about-partner__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 4.6vw, 2.6rem);
  line-height: 1;
  color: var(--cold);
}

.page-about .about-partner__label {
  margin: 8px 0 8px;
  font-size: var(--fs-m);
  font-weight: 600;
  color: var(--cold);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: var(--fs-s);
  line-height: 1.72;
  color: var(--cold-50);
}

.page-about .about-award {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 22px;
  padding: 16px 18px;
  border-left: 2px solid var(--yellow);
  background: rgba(242, 194, 48, .08);
}

.page-about .about-award__text {
  margin: 0;
  font-size: var(--fs-s);
  line-height: 1.7;
  color: var(--cold-70);
}

/* ---------- 原则（浅色区） ---------- */
.page-about .about-principles {
  background: var(--cream);
  color: var(--ink);
  padding: clamp(36px, 6vw, 80px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-principles .kicker {
  color: var(--clay);
}

.page-about .about-principles__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.65rem, 3.6vw, 2.55rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-principles__grid {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: rgba(11, 18, 16, .16);
  border: 1px solid rgba(11, 18, 16, .16);
}

.page-about .about-principle {
  padding: 20px 18px;
  background: var(--cream);
}

.page-about .about-principle__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: .18em;
  color: var(--clay);
}

.page-about .about-principle__title {
  margin: 8px 0 8px;
  font-size: var(--fs-l);
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-principle__text {
  margin: 0;
  font-size: var(--fs-s);
  line-height: 1.72;
  color: var(--about-cream-ink);
}

.page-about .about-principles__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-principles .btn--ghost {
  color: var(--ink);
  border-color: rgba(11, 18, 16, .34);
}

.page-about .about-principles .btn--ghost:hover,
.page-about .about-principles .btn--ghost:focus-visible {
  color: var(--green);
  border-color: var(--green);
  background: rgba(18, 59, 46, .07);
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  padding: clamp(36px, 6vw, 76px) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--green) 100%);
}

.page-about .about-close__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-close__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.8rem, 4.4vw, 3rem);
  line-height: 1.06;
  letter-spacing: -.03em;
  color: var(--cold);
}

.page-about .about-close__text {
  max-width: 46ch;
  margin: 12px 0 0;
  font-size: var(--fs-s);
  line-height: 1.72;
  color: var(--cold-70);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-rhythm li {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }
}

@media (min-width: 720px) {
  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1.2fr) auto;
    align-items: end;
    gap: clamp(24px, 5vw, 60px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(240px, .85fr);
    align-items: end;
    gap: clamp(32px, 6vw, 76px);
  }

  .page-about .about-era {
    grid-template-columns: minmax(0, 1fr) minmax(220px, .55fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-archive {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
    align-self: start;
    border-top: 1px solid var(--line);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-index__note {
    display: block;
  }
}

@media (max-width: 419px) {
  .page-about .about-hero__panel {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__cell--wide {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item::before,
  .page-about .tl-item__text,
  .page-about .about-crew__card,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .tl-item:hover::before {
    transform: none;
  }
}
<<<END>>>