.page-about {
  --about-gutter: clamp(20px, 4vw, 56px);
  --about-chapter-pad: clamp(48px, 7vw, 108px);
  background: var(--ink-0);
  color: var(--white);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 6vw, 88px) 0 clamp(44px, 7vw, 96px);
  background:
    radial-gradient(120% 90% at 84% 4%, rgba(198, 255, 61, .10), transparent 60%),
    radial-gradient(90% 70% at 0% 100%, rgba(15, 61, 46, .55), transparent 66%),
    linear-gradient(180deg, var(--ink-1) 0%, var(--ink-0) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(12px, 1.8vw, 20px);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(40px, 8.4vw, 118px);
  line-height: .94;
  letter-spacing: -.028em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-hero__side {
  display: none;
}

.page-about .about-hero__foot {
  margin-top: clamp(26px, 4vw, 52px);
  padding-top: clamp(20px, 3vw, 36px);
  border-top: 1px solid var(--line);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 0;
  color: var(--white);
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.78;
}

.page-about .about-hero__lede--second {
  margin-top: 14px;
  color: var(--muted);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-2);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1;
}

.page-about .about-hero__meta .mono {
  color: var(--lime);
  font-size: 17px;
  font-weight: 700;
}

/* ---------- 长卷布局 ---------- */

.page-about .about-layout {
  width: var(--shell);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 88px) 0 clamp(64px, 9vw, 132px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-index {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ink-2);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 11.5px;
  color: var(--lime);
  opacity: .7;
  transition: opacity .16s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--white);
  border-color: var(--lime);
}

.page-about .about-index__link[aria-current="page"] {
  color: var(--lime);
  border-color: var(--lime);
  background: var(--ink-3);
}

.page-about .about-index__link[aria-current="page"] .mono {
  opacity: 1;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: var(--about-chapter-pad);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter--tinted {
  padding-inline: clamp(16px, 3vw, 40px);
  margin-inline: calc(-1 * clamp(16px, 3vw, 40px));
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(15, 61, 46, 0) 0%, rgba(15, 61, 46, .52) 18%, rgba(15, 61, 46, .52) 82%, rgba(15, 61, 46, 0) 100%);
}

.page-about .about-chapter--reach {
  padding-inline: clamp(16px, 3vw, 40px);
  margin-inline: calc(-1 * clamp(16px, 3vw, 40px));
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(255, 122, 26, .09) 0%, rgba(8, 11, 10, 0) 48%, rgba(198, 255, 61, .07) 100%);
}

.page-about .about-chapter__head {
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .about-chapter__kicker {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--lime);
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 4.6vw, 54px);
  line-height: 1.04;
  letter-spacing: -.022em;
  color: var(--white);
  text-wrap: balance;
}

.page-about .about-chapter__note {
  margin: 12px 0 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}

.page-about .about-chapter__intro,
.page-about .about-chapter__outro {
  margin: 0 0 clamp(22px, 3vw, 36px);
  max-width: 62ch;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.78;
  color: var(--white);
}

.page-about .about-chapter__outro {
  margin-top: clamp(22px, 3vw, 36px);
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15.5px;
}

/* ---------- 分屏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 44px);
}

.page-about .about-split__text p {
  margin: 0 0 1.15em;
  max-width: 60ch;
  font-size: clamp(15.5px, 1.65vw, 17.5px);
  line-height: 1.8;
  color: var(--white);
}

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

.page-about .about-split__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  aspect-ratio: 14 / 9;
  background: var(--ink-2);
}

.page-about .about-split__media--tall {
  aspect-ratio: 3 / 2;
}

.page-about .about-split__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: brightness(.82) contrast(1.06);
}

.page-about .about-split__media .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 34px 16px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--muted);
  background: linear-gradient(180deg, rgba(8, 11, 10, 0), rgba(8, 11, 10, .92));
}

/* ---------- 时间线 ---------- */

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--orange) 55%, rgba(198, 255, 61, 0) 100%);
  opacity: .38;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(20px, 2.6vw, 30px);
}

.page-about .about-timeline__gen {
  position: relative;
  z-index: 1;
  align-self: start;
  padding-top: 2px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--lime);
  background: var(--ink-0);
}

.page-about .about-timeline__node {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-timeline__node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16.5px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.38;
  letter-spacing: -.01em;
  color: var(--white);
  transition: color .16s var(--ease);
}

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

.page-about .about-timeline__node summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--lime);
}

.page-about .about-timeline__node[open] summary::after {
  content: "\2013";
}

.page-about .about-timeline__node summary:hover,
.page-about .about-timeline__node summary:focus-visible {
  color: var(--lime);
}

.page-about .about-timeline__node p {
  margin: 12px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-timeline__figure-wrap {
  list-style: none;
  padding: 0 0 clamp(20px, 2.8vw, 32px);
}

.page-about .about-timeline__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  aspect-ratio: 7 / 4;
  background: var(--ink-2);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: brightness(.78) contrast(1.1) saturate(.92);
}

.page-about .about-timeline__figure .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 42px 16px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
  background: linear-gradient(180deg, rgba(8, 11, 10, 0), rgba(8, 11, 10, .93));
}

/* ---------- 团队数据 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(26px, 3.6vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--ink-2);
}

.page-about .about-stats__item .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stats__item:nth-child(2) .stat__value,
.page-about .about-stats__item:nth-child(4) .stat__value {
  color: var(--orange);
}

.page-about .about-stats__item .stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

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

.page-about .about-actions__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-actions__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-actions__idx {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-actions__item p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--white);
}

/* ---------- 栏目表 ---------- */

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

.page-about .about-columns__row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 24px);
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-columns__row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-columns__idx {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--lime);
  opacity: .75;
  padding-top: 4px;
}

.page-about .about-columns__name {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-columns__desc {
  margin: 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 区域根基 ---------- */

.page-about .about-reach-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 20px);
  margin-top: clamp(26px, 3.6vw, 44px);
}

.page-about .about-reach-figure {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ink-2);
}

.page-about .about-reach-figure--peak {
  border-color: rgba(255, 122, 26, .5);
  background: linear-gradient(150deg, var(--orange-soft), var(--ink-2) 70%);
}

.page-about .about-reach-figure__num {
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-reach-figure--peak .about-reach-figure__num {
  color: var(--orange);
}

.page-about .about-reach-figure__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */

.page-about .about-chapter--belief {
  border-top: 0;
}

.page-about .about-creed {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: 0;
}

.page-about .about-creed__item {
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: clamp(18px, 2.8vw, 30px);
  line-height: 1.34;
  letter-spacing: -.012em;
  color: var(--white);
}

.page-about .about-creed__item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-creed__item::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 12px;
  vertical-align: middle;
  background: var(--lime);
}

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

/* ---------- 中等屏 ---------- */

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
    gap: clamp(26px, 3.6vw, 52px);
  }

  .page-about .about-split--rev > *:first-child {
    order: 2;
  }

  .page-about .about-hero__foot {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: clamp(24px, 4vw, 64px);
    align-items: end;
  }

  .page-about .about-hero__lede--second {
    grid-column: 1;
    margin-top: 12px;
  }

  .page-about .about-hero__meta {
    grid-column: 2;
    grid-row: 1 / span 2;
    margin-top: 0;
    justify-content: flex-end;
  }
}

/* ---------- 桌面：左侧竖排索引 ---------- */

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 196px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 88px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 4px 18px;
  }

  .page-about .about-index__label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .34em;
    margin: 0 0 18px;
    font-size: 10.5px;
    color: var(--muted);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__link {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 11px 0 11px 0;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    margin-left: -20px;
    padding-left: 18px;
    white-space: normal;
    font-size: 14px;
    line-height: 1.45;
  }

  .page-about .about-index__link .mono {
    flex: none;
    padding-top: 2px;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    color: var(--white);
    border-left-color: var(--line);
    background: none;
  }

  .page-about .about-index__link[aria-current="page"] {
    color: var(--lime);
    border-left-color: var(--lime);
    background: linear-gradient(90deg, var(--lime-soft), rgba(198, 255, 61, 0) 78%);
  }

  .page-about .about-hero__side {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .3em;
    font-size: 11.5px;
    color: var(--muted);
  }

  .page-about .about-hero__title {
    padding-right: 72px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-chapter--tinted,
  .page-about .about-chapter--reach {
    padding-inline: clamp(28px, 4vw, 64px);
    margin-inline: calc(-1 * clamp(28px, 4vw, 64px));
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-timeline__node summary {
    transition: none;
  }
}
<<<END>>>