.page-about {
  --rail-w: 88px;
  --about-card: #FFFDF8;
  --about-shadow: 8px 8px 0 rgba(226, 220, 207, .75);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--on-dark);
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, rgba(44, 66, 87, .55) 1px, transparent 1px);
  background-size: clamp(64px, 11vw, 132px) 100%;
  opacity: .4;
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(2.1rem, 5.6vw, 3.75rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -.02em;
  max-width: 22ch;
}

.page-about .about-hero__text {
  margin: 0 0 1rem;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--on-dark-dim);
  max-width: 58ch;
}

.page-about .about-stats {
  display: grid;
  gap: .85rem;
  margin: 0;
  padding-left: 1.15rem;
  border-left: 1px solid var(--steel);
}

.page-about .about-stats__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: .65rem;
  border-bottom: 1px solid rgba(44, 66, 87, .85);
}

.page-about .about-stats__label {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .12em;
  color: var(--on-dark-dim);
}

.page-about .about-stats__val {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--on-dark);
  white-space: nowrap;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--copper-light);
  letter-spacing: .02em;
  margin-right: .25rem;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(2.75rem, 6vw, 5rem) 0;
  background: var(--paper);
  color: var(--on-light);
}

.page-about .about-section--dark {
  background: var(--ink);
  color: var(--on-dark);
}

.page-about .about-section--tint {
  background: var(--paper-2);
}

.page-about .about-section--dark p,
.page-about .about-section--dark .about-lede {
  color: var(--on-dark-dim);
}

.page-about .about-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: .7rem;
}

.page-about .rail-no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  letter-spacing: .1em;
  color: var(--copper);
}

.page-about .rail-name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .22em;
  color: var(--cool);
}

.page-about .about-section--dark .rail-no {
  color: var(--copper-light);
}

.page-about .about-section--dark .rail-name {
  color: var(--steel);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-body h2 {
  margin: 0 0 .9rem;
  font-size: var(--fs-h2);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.02em;
}

.page-about .about-lede {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--stone);
  max-width: 62ch;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0 0 clamp(2rem, 4vw, 2.75rem);
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .timeline__item {
  display: grid;
  gap: .55rem;
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  letter-spacing: .08em;
  color: var(--copper);
}

.page-about .timeline__card {
  position: relative;
  background: var(--about-card);
  border: 1px solid var(--paper-2);
  box-shadow: var(--about-shadow);
  padding: 1.05rem 1.15rem 1.2rem;
}

.page-about .node-flag {
  display: inline-block;
  margin-bottom: .55rem;
  padding: .22rem .6rem;
  background: var(--copper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .14em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
}

.page-about .timeline__title {
  margin: 0 0 .45rem;
  font-size: 1.0625rem;
  line-height: 1.5;
  font-weight: 700;
}

.page-about .timeline__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 档案带 ---------- */
.page-about .history-band {
  display: grid;
  gap: 1.25rem;
  padding-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--paper-2);
}

.page-about .history-band__text p:last-child {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .history-band__media {
  margin: 0;
}

/* ---------- 能力矩阵 ---------- */
.page-about .cap-layout {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .cap-tabs {
  min-width: 0;
}

.page-about .cap-tablist {
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  padding-bottom: .55rem;
  margin-bottom: 1.15rem;
  border-bottom: 1px solid var(--steel);
}

.page-about .cap-tab {
  flex: 0 0 auto;
  appearance: none;
  background: transparent;
  border: 1px solid var(--steel);
  border-radius: 0;
  color: var(--on-dark-dim);
  font-family: inherit;
  font-size: var(--fs-sm);
  padding: .55rem 1rem;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .cap-tab:hover {
  color: var(--on-dark);
  border-color: var(--copper);
}

.page-about .cap-tab[aria-selected="true"] {
  background: var(--ink-2);
  border-color: var(--copper);
  color: var(--on-dark);
  box-shadow: inset 0 -2px 0 var(--copper);
}

.page-about .cap-tab:focus-visible {
  outline: 2px solid var(--copper-light);
  outline-offset: 2px;
}

.page-about .cap-head {
  display: none;
  margin: 0;
  padding-bottom: .5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .14em;
  color: var(--copper-light);
  border-bottom: 1px solid var(--steel);
}

.page-about .cap-row {
  display: grid;
  gap: .3rem;
  padding: .95rem 0;
  border-bottom: 1px solid rgba(44, 66, 87, .75);
}

.page-about .cap-row p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
}

.page-about .cap-name {
  color: var(--on-dark);
  font-weight: 700;
}

.page-about .cap-tol {
  color: var(--copper-light);
  font-family: var(--font-mono);
  font-size: var(--fs-mono) !important;
  letter-spacing: .04em;
  line-height: 1.9 !important;
}

.page-about .cap-test {
  color: var(--on-dark-dim);
}

.page-about .cap-media {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .team-roles {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: 1.1rem;
}

.page-about .team-roles__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .9rem 1rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--paper-2);
}

.page-about .team-roles__no {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1;
  color: var(--copper);
  letter-spacing: .02em;
}

.page-about .team-roles__title {
  margin: 0 0 .35rem;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .team-roles__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .team-note {
  margin: 0;
  padding: .85rem 0 0 .9rem;
  border-left: 3px solid var(--copper);
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .team-media {
  margin: 0;
}

/* ---------- 资质卡 ---------- */
.page-about .cert-grid {
  display: grid;
  gap: 1rem;
}

.page-about .cert-card {
  background: var(--about-card);
  border: 1px solid rgba(192, 138, 46, .45);
  box-shadow: inset 0 0 0 4px var(--about-card), inset 0 0 0 5px rgba(192, 138, 46, .28);
  padding: .35rem .2rem;
}

.page-about .cert-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem .8rem;
  padding: .8rem 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .cert-card__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--copper);
}

.page-about .cert-card[open] .cert-card__head::after {
  content: "−";
}

.page-about .cert-card__head:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: -2px;
}

.page-about .cert-card__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .14em;
  color: var(--stone);
}

.page-about .cert-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--on-light);
}

.page-about .cert-card__body {
  padding: 0 1rem 1.1rem;
  border-top: 1px solid var(--paper-2);
  margin-top: .1rem;
}

.page-about .cert-card__body p {
  margin: .8rem 0 0;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .cert-card__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mono) !important;
  letter-spacing: .04em;
  color: var(--cool) !important;
  line-height: 1.9 !important;
}

/* ---------- 协作网络 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .partner-figs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .9rem;
}

.page-about .partner-fig {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .15rem .9rem;
  align-items: baseline;
  padding: .9rem 0 .9rem .9rem;
  border-left: 3px solid var(--copper);
  border-bottom: 1px solid var(--paper-2);
}

.page-about .partner-fig__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  line-height: 1;
  color: var(--copper);
}

.page-about .partner-fig__label {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--on-light);
}

.page-about .partner-fig__text {
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--cool);
}

.page-about .partner-text h3 {
  margin: 0 0 .4rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--on-light);
  padding-top: .9rem;
  border-top: 1px solid var(--paper-2);
}

.page-about .partner-text h3:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .partner-text p {
  margin: 0 0 1.1rem;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  background: var(--ink-2);
  color: var(--on-dark);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  border-top: 3px solid var(--copper);
}

.page-about .about-cta h2 {
  margin: 0 0 .9rem;
  font-size: var(--fs-h2);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -.02em;
}

.page-about .about-cta__text {
  margin: 0 0 1.5rem;
  max-width: 60ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--on-dark-dim);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-cta__note {
  margin: 1.4rem 0 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--cool);
}

.page-about .about-cta__note a {
  color: var(--copper-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__note a:hover {
  color: var(--copper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .timeline__item {
    grid-template-columns: 5.5rem minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
  }

  .page-about .timeline__year {
    padding-top: .95rem;
    text-align: right;
  }

  .page-about .cert-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, .8fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-row {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3.25rem);
  }

  .page-about .about-row::before {
    content: "";
    position: absolute;
    top: .4rem;
    bottom: .4rem;
    left: calc(var(--rail-w) - 1px);
    width: 1px;
    background: linear-gradient(180deg, var(--copper), rgba(192, 138, 46, .08));
    pointer-events: none;
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
    padding-top: .35rem;
  }

  .page-about .about-rail .rail-no {
    font-size: 1.6rem;
  }

  .page-about .rail-name {
    writing-mode: vertical-rl;
    letter-spacing: .3em;
  }

  .page-about .history-band {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(1.5rem, 4vw, 2.5rem);
    align-items: start;
  }

  .page-about .cap-layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .cap-head {
    display: grid;
    grid-template-columns: 1.1fr .9fr 1.2fr;
    gap: 1.5rem;
  }

  .page-about .cap-row {
    grid-template-columns: 1.1fr .9fr 1.2fr;
    gap: 1.5rem;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about {
    --rail-w: 108px;
  }

  .page-about .cap-media {
    margin-top: -.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cap-tab {
    transition: none;
  }
}
<<<END>>>