.page-about {
  --about-line: var(--line);
  --about-spot: radial-gradient(120% 90% at 84% -14%, rgba(185, 255, 61, 0.16), rgba(185, 255, 61, 0) 62%);
  --about-block-gap: clamp(44px, 7vw, 96px);

  position: relative;
  overflow-x: clip;
  background-color: var(--ink-black);
  color: var(--fog);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .page-shell {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-weight: 900;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1;
  letter-spacing: -0.012em;
}

.page-about h3 {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: 1.2;
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  padding: clamp(22px, 4vw, 48px) 0 clamp(30px, 5vw, 64px);
  background-image: var(--about-spot);
  background-repeat: no-repeat;
  background-size: min(720px, 96%) 460px;
  background-position: right -60px top -80px;
}

.page-about .about-hero__title {
  margin-top: 14px;
  font-family: var(--font-display);
  font-size: clamp(38px, 9.4vw, 92px);
  line-height: 0.94;
  letter-spacing: -0.018em;
  color: var(--fog);
}

.page-about .about-hero__lead p {
  margin: 0 0 14px;
  max-width: 52ch;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--sage);
}

.page-about .about-hero__lead p:first-child {
  font-size: var(--fs-body);
  color: var(--fog);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts .pill {
  font-size: var(--fs-xs);
  letter-spacing: 0.02em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 章节容器 ---------- */
.page-about .about-block {
  margin-top: var(--about-block-gap);
  padding-top: clamp(22px, 3.4vw, 40px);
  border-top: 1px solid rgba(43, 58, 50, 0.72);
}

.page-about .section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .about-block__lead {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--sage);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 26px;
}

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

.page-about .timeline__item {
  position: relative;
  padding: 0 0 26px 22px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--board-green);
  border: 1px solid var(--about-line);
  box-shadow: 0 0 0 4px var(--ink-black);
}

.page-about .timeline__item--now::before {
  background-color: var(--pitch);
  border-color: var(--pitch);
  box-shadow: 0 0 0 4px var(--ink-black), 0 0 0 7px rgba(185, 255, 61, 0.16);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.6vw, 28px);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--sage);
}

.page-about .timeline__item--now .timeline__year {
  color: var(--pitch);
}

.page-about .timeline__body h3 {
  margin: 6px 0 6px;
  color: var(--fog);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--sage);
}

.page-about .about-timeline__figure {
  margin: 0;
}

/* ---------- 图片通用 ---------- */
.page-about .media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(158deg, var(--board-green), var(--deep-green) 70%);
  border: 1px solid var(--about-line);
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__caption {
  padding: 12px 16px 14px;
  font-size: var(--fs-xs);
  line-height: 1.55;
  color: var(--sage);
  background-color: rgba(7, 11, 9, 0.55);
}

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

.page-about .team-total {
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .team-total__num {
  font-family: var(--font-mono);
  font-size: clamp(54px, 10vw, 84px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--pitch);
}

.page-about .team-total__label {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.65;
  color: var(--sage);
}

.page-about .team-total__label .mono {
  color: var(--fog);
}

.page-about .team-matrix {
  display: grid;
  gap: 1px;
  background-color: var(--about-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .team-matrix__row {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  background-color: var(--deep-green);
  transition: background-color 0.24s var(--ease);
}

.page-about .team-matrix__row:hover {
  background-color: var(--board-green);
}

.page-about .team-matrix__row--head {
  display: none;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--sage);
  background-color: var(--board-green);
}

.page-about .team-matrix__role {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .team-matrix__count {
  font-size: var(--fs-xs);
  color: var(--ref-yellow);
}

.page-about .team-matrix__desc {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.65;
  color: var(--sage);
}

/* ---------- 三级校验 ---------- */
.page-about .about-checks {
  display: grid;
  gap: 24px;
}

.page-about .checks {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .checks__item {
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  background-color: var(--deep-green);
  overflow: hidden;
}

.page-about .checks__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 15px;
  color: var(--fog);
}

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

.page-about .checks__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--pitch);
}

.page-about .checks__details[open] > .checks__summary::after {
  content: "−";
}

.page-about .checks__no {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  color: var(--ink-black);
  background-color: var(--pitch);
}

.page-about .checks__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--sage);
}

.page-about .about-checks__figure {
  margin: 0;
}

/* ---------- 内容体系 ---------- */
.page-about .tracks {
  border-bottom: 1px solid var(--about-line);
}

.page-about .track {
  display: grid;
  gap: 10px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .track__tag {
  justify-self: start;
  font-size: var(--fs-xs);
}

.page-about .track__main h3 {
  margin-bottom: 6px;
  color: var(--fog);
}

.page-about .track__main p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--sage);
}

.page-about .track__link {
  justify-self: start;
  align-self: center;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--pitch);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.22s var(--ease);
}

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

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

.page-about .stat {
  display: grid;
  gap: 4px;
  padding: 16px 14px;
  background-color: var(--deep-green);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--fog);
}

.page-about .stat__label {
  font-size: var(--fs-xs);
  line-height: 1.5;
  color: var(--sage);
}

.page-about .stat--pitch .stat__num {
  color: var(--pitch);
}

.page-about .stat--yellow .stat__num {
  color: var(--ref-yellow);
}

.page-about .about-reach__note {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--sage);
}

/* ---------- 迭代与服务 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: 24px;
}

.page-about .cadence {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence__item {
  display: grid;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--board-green);
}

.page-about .cadence__key {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--ref-yellow);
}

.page-about .cadence__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--sage);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-cadence__figure {
  margin: 0;
}

/* ---------- 中等屏幕 ---------- */
@media (min-width: 720px) {
  .page-about .timeline__item {
    display: grid;
    grid-template-columns: clamp(104px, 14vw, 168px) minmax(0, 1fr);
    gap: 16px;
    padding-left: 26px;
  }

  .page-about .timeline__year {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: clamp(32px, 4.2vw, 56px);
    line-height: 0.9;
    letter-spacing: -0.02em;
  }

  .page-about .timeline__body h3 {
    margin-top: 0;
  }

  .page-about .team-matrix__row {
    grid-template-columns: minmax(0, 178px) 74px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
    padding: 16px 20px;
  }

  .page-about .team-matrix__row--head {
    display: grid;
  }

  .page-about .stat {
    padding: 18px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__lead {
    padding-bottom: 8px;
  }

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

  .page-about .track {
    grid-template-columns: minmax(0, 150px) minmax(0, 1fr) minmax(0, 128px);
    align-items: start;
    gap: 24px;
  }

  .page-about .track__link {
    justify-self: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 4.5vw, 60px);
  }

  .page-about .about-timeline__figure {
    position: sticky;
    top: 28px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-checks {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .about-cadence {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
    gap: clamp(24px, 4vw, 56px);
  }
}
<<<END>>>