.page-about {
  --ab-mark-w: 62px;
}

.page-about .breadcrumbs {
  margin: 22px 0 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-slate);
}

.page-about .breadcrumbs a {
  color: var(--c-electric);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumbs a:hover {
  border-bottom-color: var(--c-electric);
}

.page-about .breadcrumbs span[aria-hidden] {
  color: var(--c-clay);
  padding: 0 7px;
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  padding-bottom: 4px;
}

.page-about .ab-frame {
  border: var(--line);
  box-shadow: var(--shadow);
  background: var(--c-paper);
  padding: 18px 16px 16px;
}

.page-about .ab-ticks {
  height: 9px;
  border-bottom: 2px solid var(--c-ink);
  background-image: repeating-linear-gradient(to right, var(--c-clay) 0 1px, transparent 1px 16px);
  margin-bottom: 22px;
}

.page-about .ab-hero__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--c-ink);
  margin: 12px 0 0;
  max-width: 20em;
}

.page-about .ab-hero__title::after {
  content: "";
  display: block;
  width: 72px;
  height: 5px;
  margin-top: 18px;
  background: var(--c-jersey);
}

.page-about .ab-hero__lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-slate);
  margin: 18px 0 22px;
  max-width: 42ch;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 0 0 22px;
  padding: 16px 0 0;
  border-top: 1px solid var(--c-mist);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 13px;
  color: var(--c-slate);
}

.page-about .ab-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .ab-hero__facts .mono {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ridge);
  letter-spacing: .02em;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .ab-hero__media {
  margin: 0;
  border: var(--line);
  background: var(--c-mist);
  overflow: hidden;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 200px;
  object-fit: cover;
}

/* ---------- 三条规则 ---------- */
.page-about .ab-sub {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--c-slate);
  max-width: 44ch;
}

.page-about .ab-rules {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 2px solid var(--c-ink);
}

.page-about .ab-rule {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px solid var(--c-mist);
}

.page-about .ab-rule__num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--c-clay);
}

.page-about .ab-rule__num::after {
  content: "";
  display: block;
  width: 30px;
  height: 3px;
  margin-top: 12px;
  background: var(--c-jersey);
}

.page-about .ab-rule__title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.4;
  color: var(--c-ink);
  margin: 0 0 8px;
}

.page-about .ab-rule__text p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--c-slate);
  max-width: 48ch;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-track {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-node {
  display: grid;
  grid-template-columns: var(--ab-mark-w) minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0 14px 14px;
  border-left: 3px solid var(--c-ridge);
}

.page-about .ab-node__mark {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-ridge);
  line-height: 1.3;
}

.page-about .ab-node__mark span {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-clay);
}

.page-about .ab-node__mark em {
  display: block;
  font-style: normal;
  margin-top: 4px;
  color: var(--c-moss);
}

.page-about .ab-node__body summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.5;
  color: var(--c-ink);
}

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

.page-about .ab-node__body summary::before {
  content: "+";
  flex: none;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--c-paper);
  background: var(--c-ridge);
}

.page-about .ab-node__body[open] summary::before {
  content: "−";
  background: var(--c-jersey);
}

.page-about .ab-node__body summary:hover {
  color: var(--c-ridge);
}

.page-about .ab-node__panel {
  padding: 12px 0 2px 30px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-slate);
  max-width: 54ch;
}

.page-about .ab-node__panel p {
  margin: 0;
}

/* ---------- 团队分工 ---------- */
.page-about .ab-teams {
  display: flex;
  gap: 14px;
  margin: 26px calc(var(--gutter) * -1) 0;
  padding: 4px var(--gutter) 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-team {
  position: relative;
  flex: 0 0 84%;
  scroll-snap-align: start;
  border: var(--line);
  box-shadow: var(--shadow-sm);
  background: var(--c-paper);
  padding: 24px 18px 22px;
}

.page-about .ab-team::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 7px;
  background: var(--c-ridge);
}

.page-about .ab-team--b::before {
  background: var(--c-jersey);
}

.page-about .ab-team--c::before {
  background: var(--c-electric);
}

.page-about .ab-team__name {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.3;
  color: var(--c-ink);
  margin: 6px 0 6px;
}

.page-about .ab-team__role {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--c-clay);
  margin: 0 0 14px;
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-slate);
}

.page-about .ab-teamshot {
  margin: 26px 0 0;
  border: var(--line);
  background: var(--c-mist);
  overflow: hidden;
}

.page-about .ab-teamshot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 220px;
  object-fit: cover;
}

.page-about .ab-teamshot .media__caption {
  padding: 12px 16px;
  background: var(--c-paper);
  border-top: 1px solid var(--c-mist);
}

/* ---------- 数据板 ---------- */
.page-about .ab-board {
  position: relative;
  overflow: hidden;
  border: var(--line);
  box-shadow: var(--shadow);
  background: var(--c-ridge);
  color: var(--c-paper);
  padding: 26px 18px 28px;
}

.page-about .ab-board::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(to right, rgba(246, 243, 236, .1) 0 1px, transparent 1px 26px);
}

.page-about .ab-board__title {
  position: relative;
  z-index: 1;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.25;
  color: var(--c-paper);
  margin: 0 0 10px;
}

.page-about .ab-board__lead {
  position: relative;
  z-index: 1;
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-mist);
  max-width: 46ch;
}

.page-about .ab-board__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin: 0;
}

.page-about .ab-stat {
  margin: 0;
  padding-top: 12px;
  border-top: 2px solid rgba(246, 243, 236, .32);
}

.page-about .ab-stat dt {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-mist);
  margin-bottom: 8px;
}

.page-about .ab-stat__num {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin: 0;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--c-paper);
}

.page-about .ab-stat__num small {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-batch);
}

/* ---------- 文档维护 ---------- */
.page-about .ab-docs__grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-docs__lead {
  margin: 16px 0 20px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--c-slate);
  max-width: 48ch;
}

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

.page-about .ab-docs__list li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  padding: 13px 0;
  border-top: 1px solid var(--c-mist);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-slate);
}

.page-about .ab-docs__list li:last-child {
  border-bottom: 1px solid var(--c-mist);
}

.page-about .ab-docs__list .mono {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-ridge);
  padding-top: 3px;
}

.page-about .ab-docs__media {
  margin: 0;
  border: var(--line);
  background: var(--c-mist);
  overflow: hidden;
}

.page-about .ab-docs__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 240px;
  object-fit: cover;
}

.page-about .ab-docs__media .media__caption {
  padding: 12px 16px;
  background: var(--c-paper);
  border-top: 1px solid var(--c-mist);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners__row {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.page-about .ab-partner {
  border: var(--line);
  box-shadow: var(--shadow-sm);
  background: var(--c-mist);
  padding: 22px 18px 24px;
}

.page-about .ab-partner__num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-ridge);
  margin: 0 0 8px;
}

.page-about .ab-partner__name {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  color: var(--c-ink);
  margin: 0 0 10px;
}

.page-about .ab-partner__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-slate);
}

.page-about .ab-partners__note {
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--c-mist);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-slate);
  max-width: 62ch;
}

.page-about .ab-partners__note a {
  color: var(--c-electric);
}

/* ---------- 页尾收束 ---------- */
.page-about .ab-close {
  margin-top: 10px;
  padding-bottom: 40px;
}

.page-about .ab-ridge {
  display: block;
  width: 100%;
  height: 46px;
  color: var(--c-moss);
}

.page-about .ab-close__inner {
  display: grid;
  gap: 18px;
  border: var(--line);
  box-shadow: var(--shadow);
  background: var(--c-paper);
  padding: 24px 18px 26px;
}

.page-about .ab-close__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 24px;
  line-height: 1.25;
  color: var(--c-ink);
  margin: 0 0 10px;
}

.page-about .ab-close__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-slate);
  max-width: 52ch;
}

.page-about .ab-close__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-hero__media img {
    height: 320px;
  }

  .page-about .ab-teamshot img {
    height: 300px;
  }

  .page-about .ab-board__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px 24px;
  }
}

@media (min-width: 840px) {
  .page-about .ab-frame {
    padding: 24px 26px 22px;
  }

  .page-about .ab-hero__title {
    font-size: 52px;
  }

  .page-about .ab-hero__lead {
    font-size: 17px;
  }

  .page-about .ab-hero__media img {
    height: 420px;
  }

  .page-about .ab-rule {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 24px;
    padding: 26px 0;
  }

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

  .page-about .ab-track {
    gap: 18px;
  }

  .page-about .ab-node {
    padding: 18px 0 18px 20px;
    gap: 22px;
  }

  .page-about .ab-teams {
    display: grid;
    grid-template-columns: 1.22fr 1fr .86fr;
    gap: 22px;
    margin-inline: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .ab-team {
    flex: none;
    padding: 28px 22px 26px;
  }

  .page-about .ab-team--b {
    margin-top: 28px;
  }

  .page-about .ab-team--c {
    margin-top: 12px;
  }

  .page-about .ab-teamshot img {
    height: 340px;
  }

  .page-about .ab-board {
    padding: 34px 32px 38px;
  }

  .page-about .ab-board__title {
    font-size: 34px;
  }

  .page-about .ab-stat__num {
    font-size: 44px;
  }

  .page-about .ab-docs__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-docs__media img {
    height: 380px;
  }

  .page-about .ab-partners__row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .ab-ridge {
    height: 60px;
  }

  .page-about .ab-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 34px;
    padding: 32px 30px;
  }

  .page-about .ab-close__links {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    transition-duration: 120ms;
  }

  .page-about .ab-node__body summary::before {
    transition: none;
  }
}
<<<END>>>