.page-about {
  --about-rule: 1px solid var(--edge);
  background: var(--night);
  color: var(--fog);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-bottom: clamp(2rem, 5vw, 4rem);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding: 1rem 0 .25rem;
}
.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .65rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--mute);
}
.page-about .breadcrumbs__list li + li::before {
  content: "/";
  margin-right: .55rem;
  color: var(--edge);
}
.page-about .breadcrumbs__list a {
  color: var(--mute);
  text-decoration: none;
}
.page-about .breadcrumbs__list a:hover,
.page-about .breadcrumbs__list a:focus-visible {
  color: var(--pulse);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--pulse);
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 .9rem;
}
.page-about .eyebrow::before {
  content: "";
  width: 1.6rem;
  height: 2px;
  background: var(--pulse);
}

/* ---------- HERO ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 3.5vw, 3rem) 0 clamp(2rem, 4vw, 3.5rem);
  border-bottom: var(--about-rule);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--pulse) 0%, transparent 55%);
  opacity: .55;
}
.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
}
.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 6.2vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  margin: 0 0 1.1rem;
  color: var(--fog);
}
.page-about .about-hero__title em {
  font-style: normal;
  color: var(--pulse);
  position: relative;
}
.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.08em;
  height: 6px;
  background: linear-gradient(90deg, var(--pulse), transparent);
  opacity: .35;
}
.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(1rem, 1.25vw, 1.075rem);
  color: var(--fog);
  opacity: .88;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem .9rem;
  margin-top: 1.5rem;
}
.page-about .about-hero__aside {
  display: grid;
  gap: 1rem;
}
.page-about .about-hero__figure,
.page-about .team-visual__figure,
.page-about .partners-visual__figure {
  margin: 0;
  border: var(--about-rule);
  border-top: 2px solid var(--pulse);
  background:
    repeating-linear-gradient(135deg, var(--rail) 0 8px, transparent 8px 16px),
    var(--panel);
  overflow: hidden;
}
.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .media-frame__caption {
  padding: .55rem .8rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--pulse-soft);
  border-top: 1px dashed var(--edge);
  background: var(--night);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: var(--about-rule);
  margin: 0;
}
.page-about .about-facts > div {
  background: var(--panel);
  padding: .8rem .9rem;
}
.page-about .about-facts dt {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--mute);
}
.page-about .about-facts dd {
  margin: .2rem 0 0;
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--pulse);
  line-height: 1.1;
}

/* ---------- 通用章节头 ---------- */
.page-about .about-section-head {
  max-width: 62ch;
  margin-bottom: clamp(1.25rem, 3vw, 2.25rem);
}
.page-about .about-section-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0 0 .8rem;
  color: var(--fog);
}
.page-about .about-section-head__lede {
  margin: 0;
  font-size: .975rem;
  color: var(--fog);
  opacity: .8;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  border-bottom: var(--about-rule);
}
.page-about .timeline-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}
.page-about .timeline-rail {
  display: flex;
  gap: .35rem;
  overflow-x: auto;
  padding-bottom: .45rem;
  border-bottom: var(--about-rule);
  scrollbar-width: thin;
}
.page-about .timeline-rail::-webkit-scrollbar {
  height: 4px;
}
.page-about .timeline-rail::-webkit-scrollbar-thumb {
  background: var(--edge);
}
.page-about .timeline-rail__link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .9rem;
  letter-spacing: .04em;
  color: var(--mute);
  text-decoration: none;
  padding: .32rem .6rem;
  border: 1px solid transparent;
  transition: color var(--dur), border-color var(--dur), background var(--dur);
}
.page-about .timeline-rail__link:hover,
.page-about .timeline-rail__link:focus-visible {
  color: var(--pulse);
  border-color: var(--edge);
  background: var(--panel);
  outline: none;
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .85rem;
  counter-reset: stage;
}
.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .55rem;
  padding: 1.15rem 1.25rem 1.25rem;
  background: var(--panel);
  border: var(--about-rule);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  scroll-margin-top: 5rem;
  transition: border-color var(--dur), background var(--dur);
}
.page-about .timeline-item:hover {
  border-color: var(--pulse);
  background: var(--rail);
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--pulse);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur) ease;
}
.page-about .timeline-item:hover::before,
.page-about .timeline-item:target::before {
  transform: scaleY(1);
}
.page-about .timeline-item__year {
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--pulse);
  line-height: 1;
  letter-spacing: .02em;
}
.page-about .timeline-item__body h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin: 0 0 .35rem;
  color: var(--fog);
}
.page-about .timeline-item__body p {
  margin: 0;
  font-size: .93rem;
  color: var(--fog);
  opacity: .82;
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  border-bottom: var(--about-rule);
}
.page-about .principles-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}
.page-about .principle {
  position: relative;
  padding: 1.35rem 1.25rem 3.4rem;
  background: var(--panel);
  border: var(--about-rule);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: border-color var(--dur), background var(--dur);
  overflow: hidden;
  cursor: default;
  outline: none;
}
.page-about .principle:hover,
.page-about .principle:focus-visible,
.page-about .principle:focus-within {
  border-color: var(--pulse);
  background: var(--rail);
}
.page-about .principle__num {
  margin: 0 0 .5rem;
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--pulse);
}
.page-about .principle h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  margin: 0 0 .55rem;
  color: var(--fog);
}
.page-about .principle__desc {
  margin: 0;
  font-size: .93rem;
  color: var(--fog);
  opacity: .83;
}
.page-about .principle__hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: .75rem 1.25rem;
  background: var(--pulse);
  color: var(--ink);
  font-size: .82rem;
  font-weight: 600;
  line-height: 1.5;
  transform: translateY(101%);
  transition: transform var(--dur) ease;
}
.page-about .principle:hover .principle__hint,
.page-about .principle:focus-visible .principle__hint,
.page-about .principle:focus-within .principle__hint {
  transform: translateY(0);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  border-bottom: var(--about-rule);
}
.page-about .team-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}
.page-about .team-visual {
  order: 2;
}
.page-about .team-body {
  order: 1;
}
.page-about .team-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .7rem;
}
.page-about .team-role {
  border: var(--about-rule);
  background: var(--panel);
  padding: .85rem 1rem;
  border-left: 3px solid var(--amber);
  transition: background var(--dur), border-left-color var(--dur);
}
.page-about .team-role:hover {
  background: var(--rail);
  border-left-color: var(--pulse);
}
.page-about .team-role__count {
  margin: 0;
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}
.page-about .team-role__name {
  margin: .35rem 0 .3rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: .98rem;
  letter-spacing: -0.01em;
  color: var(--fog);
}
.page-about .team-role__desc {
  margin: 0;
  font-size: .85rem;
  color: var(--fog);
  opacity: .78;
}
.page-about .team-rhythm {
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  border: 1px dashed var(--edge);
  background: rgba(18, 63, 51, 0.35);
}
.page-about .team-rhythm h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  margin: 0 0 .7rem;
  color: var(--pulse-soft);
  letter-spacing: -0.01em;
}
.page-about .team-rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .5rem;
  font-size: .9rem;
  color: var(--fog);
}
.page-about .team-rhythm__list li {
  display: grid;
  grid-template-columns: 4.2rem minmax(0, 1fr);
  gap: .6rem;
  align-items: baseline;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--rail);
}
.page-about .team-rhythm__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .team-rhythm__tag {
  color: var(--pulse);
  font-size: .8rem;
  letter-spacing: .06em;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: clamp(2rem, 4vw, 3.5rem) 0 clamp(2rem, 4vw, 3rem);
}
.page-about .partners-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}
.page-about .partners-visual {
  order: 2;
}
.page-about .partners-body {
  order: 1;
  display: grid;
  gap: 1.25rem;
}
.page-about .partner-nodes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .7rem;
}
.page-about .partner-node {
  border: var(--about-rule);
  background: var(--panel);
  padding: .9rem 1rem;
  position: relative;
  transition: border-color var(--dur), background var(--dur);
}
.page-about .partner-node:hover {
  border-color: var(--pulse);
  background: var(--rail);
}
.page-about .partner-node__num {
  margin: 0 0 .3rem;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--pulse);
  letter-spacing: .02em;
}
.page-about .partner-node h3 {
  margin: 0 0 .3rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: .98rem;
  letter-spacing: -0.01em;
  color: var(--fog);
}
.page-about .partner-node p {
  margin: 0;
  font-size: .85rem;
  color: var(--fog);
  opacity: .78;
}

.page-about .credential-board {
  border-top: 2px solid var(--pulse);
  background: var(--panel);
  padding: 1.1rem 1.15rem 1.25rem;
}
.page-about .credential-board h3 {
  margin: 0 0 .8rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--pulse-soft);
}
.page-about .credential-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .6rem;
  font-size: .9rem;
  color: var(--fog);
}
.page-about .credential-list li {
  display: grid;
  grid-template-columns: 4.2rem minmax(0, 1fr);
  gap: .65rem;
  align-items: baseline;
}
.page-about .credential-list .label-tag {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--amber);
  border: 1px solid var(--edge);
  padding: .12rem .35rem;
  text-align: center;
  justify-self: start;
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  padding: clamp(1rem, 2vw, 1.5rem) 0 0;
}
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  padding: clamp(1.35rem, 3vw, 2.25rem);
  background:
    linear-gradient(135deg, rgba(42, 245, 176, 0.10), transparent 55%),
    var(--panel);
  border: var(--about-rule);
  border-left: 4px solid var(--pulse);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}
.page-about .about-cta__copy h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 .7rem;
  color: var(--fog);
}
.page-about .about-cta__copy p {
  margin: 0;
  font-size: .93rem;
  color: var(--fog);
  opacity: .82;
  max-width: 55ch;
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem .8rem;
  align-self: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .partner-nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .principles-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .principles-grid .principle:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
  .page-about .timeline-shell {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: clamp(1.5rem, 3.5vw, 2.75rem);
    align-items: start;
  }
  .page-about .timeline-rail {
    flex-direction: column;
    position: sticky;
    top: 5.5rem;
    overflow: visible;
    padding: 0 0 0 1rem;
    border-bottom: 0;
    border-left: 2px solid var(--edge);
  }
  .page-about .timeline-item {
    grid-template-columns: 6rem minmax(0, 1fr);
    gap: 1.25rem;
    align-items: start;
    padding: 1.35rem 1.5rem 1.45rem;
  }
  .page-about .principles-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .principles-grid .principle:last-child {
    grid-column: auto;
  }
  .page-about .team-shell {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(1.25rem, 3vw, 2.5rem);
    align-items: start;
  }
  .page-about .team-visual {
    order: 1;
    position: sticky;
    top: 5.5rem;
  }
  .page-about .team-body {
    order: 2;
  }
  .page-about .partners-shell {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(1.25rem, 3vw, 2.5rem);
    align-items: start;
  }
  .page-about .partners-visual {
    order: 1;
  }
  .page-about .partners-body {
    order: 2;
  }
  .page-about .partner-nodes {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: 2rem;
  }
  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .principles-grid {
    gap: 1.25rem;
  }
  .page-about .principle {
    padding: 1.55rem 1.45rem 3.5rem;
  }
}
<<<END>>>