.page-about {
  --about-rule: rgba(42, 52, 104, .55);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb-row {
  padding-top: 20px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .breadcrumb a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

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

.page-about .breadcrumb > span:last-child {
  color: var(--white);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 0;
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--teal);
}

.page-about .about-hero .display {
  margin: 14px 0 0;
  max-width: 16em;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
}

.page-about .hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 16px 14px;
  background: var(--bg);
}

.page-about .hero-stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-stats .stat__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  margin-top: 46px;
  padding-top: 32px;
  border-top: 1px solid var(--grid-line);
}

.page-about .sec-head {
  margin-bottom: 16px;
}

.page-about .sec-head .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--teal-dim);
}

.page-about .section-title {
  margin-top: 8px;
  max-width: 20em;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(21px, 3.2vw, 31px);
  line-height: 1.28;
  color: var(--white);
}

.page-about .prose {
  max-width: 38em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .prose + .prose {
  margin-top: 12px;
}

.page-about .prose a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 245, 200, .4);
}

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

/* ---------- S-01 团队与分工 ---------- */
.page-about .team-split {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

.page-about .duty-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--grid-line);
}

.page-about .duty {
  padding: 18px 0;
  border-bottom: 1px solid var(--grid-line-soft);
}

.page-about .duty__figure {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .duty__n {
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 42px);
  line-height: 1;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}

.page-about .duty__unit {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--slate);
}

.page-about .duty__name {
  margin-top: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
}

.page-about .duty__desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
}

/* 图片容器 */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--grid-line);
  background: var(--panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.5) contrast(1.06) brightness(.9);
}

.page-about .about-figure .media__caption {
  padding: 10px 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
  border-top: 1px solid var(--grid-line);
}

/* ---------- S-02 赛季历程 ---------- */
.page-about .tl-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 18px 0 22px;
}

.page-about .tl-jump a {
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
  text-decoration: none;
  border: 1px solid var(--grid-line);
  transition: background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .tl-jump a:hover,
.page-about .tl-jump a:focus-visible {
  color: var(--ink);
  background: var(--teal);
  border-color: var(--teal);
}

.page-about .tl-figure {
  margin: 0 0 30px;
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .tl__item {
  position: relative;
  padding-left: 22px;
  border-left: 1px solid var(--grid-line);
  scroll-margin-top: 84px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 12px;
  width: 9px;
  height: 9px;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(61, 245, 200, .1);
}

.page-about .tl__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5.4vw, 76px);
  line-height: .94;
  letter-spacing: -.03em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__stage {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-about .tl__readout {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--teal);
}

.page-about .tl__text {
  margin-top: 10px;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- S-03 规范迭代 ---------- */
.page-about .vstrip {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--grid-line);
}

.page-about .vstrip__cell {
  padding: 14px 12px;
  border-right: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
}

.page-about .vstrip__cell:nth-child(2n) {
  border-right: 0;
}

.page-about .vstrip__cell:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .vstrip__cell.is-current {
  background: rgba(242, 178, 62, .08);
}

.page-about .vstrip__v {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--slate);
}

.page-about .vstrip__cell.is-current .vstrip__v {
  color: var(--gold);
}

.page-about .vstrip__meta {
  display: block;
  margin-top: 8px;
  font-size: 11.5px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--slate);
}

.page-about .spec-figure {
  margin: 26px 0 0;
}

.page-about .version-list {
  margin-top: 6px;
  border-top: 1px solid var(--grid-line);
}

.page-about details.disclosure {
  border-bottom: 1px solid var(--grid-line-soft);
}

.page-about details.disclosure > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--white);
}

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

.page-about details.disclosure > summary::after {
  content: "＋";
  flex: none;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--teal);
}

.page-about details.disclosure[open] > summary::after {
  content: "－";
  color: var(--gold);
}

.page-about details.disclosure > summary:focus-visible {
  outline: 1px solid var(--teal);
  outline-offset: 2px;
}

.page-about details.disclosure .disclosure__body {
  padding: 0 0 18px;
}

.page-about details.disclosure .disclosure__body p {
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- S-04 核对流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--grid-line);
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--grid-line-soft);
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}

.page-about .flow__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .flow__text {
  margin-top: 8px;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- S-05 合作生态 ---------- */
.page-about .partner-split {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

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

.page-about .partner-num {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 18px 16px;
  background: var(--bg);
}

.page-about .partner-num__v {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 50px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-num__k {
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--slate);
}

.page-about .partner-note {
  border-left: 1px solid var(--grid-line);
  padding-left: 18px;
}

.page-about .partner-note .tag {
  margin-top: 16px;
}

/* ---------- S-06 办公与联络 ---------- */
.page-about .office-band {
  display: grid;
  gap: 18px;
  margin-top: 20px;
}

.page-about .office-city {
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, 68px);
  line-height: 1;
  letter-spacing: .06em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .office-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .vstrip__cell {
    border-bottom: 0;
  }

  .page-about .vstrip__cell:nth-child(2n) {
    border-right: 1px solid var(--grid-line);
  }

  .page-about .vstrip__cell:last-child {
    border-right: 0;
  }
}

@media (min-width: 760px) {
  .page-about .duty-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .duty {
    padding: 22px 20px 26px;
    border-bottom: 0;
  }

  .page-about .duty:first-child {
    padding-left: 0;
  }

  .page-about .duty + .duty {
    border-left: 1px solid var(--grid-line);
  }

  .page-about .office-band {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 36px;
    align-items: center;
  }
}

/* ---------- 桌面：左右交替时间线 ---------- */
@media (min-width: 940px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .partner-split {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .tl {
    gap: 0;
  }

  .page-about .tl::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--grid-line);
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 72px;
    padding: 32px 0;
    border-left: 0;
    border-bottom: 1px solid var(--grid-line-soft);
  }

  .page-about .tl__item::before {
    left: 50%;
    margin-left: -4.5px;
    top: 40px;
  }

  .page-about .tl__year {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

  .page-about .tl__body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .tl__item:nth-child(even) .tl__year {
    grid-column: 2;
    text-align: left;
  }

  .page-about .tl__item:nth-child(even) .tl__body {
    grid-column: 1;
  }

  .page-about .tl__readout {
    margin-top: 4px;
  }

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-bottom: 1px solid var(--grid-line);
  }

  .page-about .flow__step {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding: 22px 20px 24px;
    border-bottom: 0;
  }

  .page-about .flow__step:first-child {
    padding-left: 0;
  }

  .page-about .flow__step + .flow__step {
    border-left: 1px solid var(--grid-line-soft);
  }

  .page-about .flow__title {
    margin-top: 12px;
  }
}
<<<END>>>