.page-about {
  --about-rail-w: 236px;
  --about-hero-pad: clamp(24px, 5vw, 56px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 36px) var(--gutter) 0;
}

.page-about .about-hero__frame {
  position: relative;
  max-width: var(--shell-max);
  margin: 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--c-deep);
  isolation: isolate;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 46px;
  height: 46px;
  border: 1px solid var(--c-teal);
  opacity: 0.5;
  pointer-events: none;
  z-index: 2;
}

.page-about .about-hero__frame::before {
  top: 14px;
  left: 14px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: 14px;
  bottom: 14px;
  border-left: 0;
  border-top: 0;
  border-color: var(--c-ember);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  z-index: 0;
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(120% 90% at 12% 8%, rgba(7, 13, 31, 0.42), rgba(7, 13, 31, 0.94) 62%),
    linear-gradient(180deg, rgba(7, 13, 31, 0.35), rgba(7, 13, 31, 0.96));
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  padding: var(--about-hero-pad);
  max-width: 880px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-stretch: condensed;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-snow);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.75;
  color: var(--c-dust);
}

.page-about .about-hero__meta {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__stamp {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-dust);
}

.page-about .about-hero__band {
  max-width: var(--shell-max);
  margin: 0 auto;
  border-radius: 0 0 var(--radius-l) var(--radius-l);
  border: 1px solid var(--line-faint);
  border-top: 0;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(32px, 6vw, 72px) var(--gutter) clamp(48px, 8vw, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
}

/* ---------- 左侧刻度与目录 ---------- */
.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-mist);
  text-transform: uppercase;
}

.page-about .about-rail__years {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-rail__year {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-dust);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-rail__year:hover,
.page-about .about-rail__year:focus-visible {
  color: var(--c-night);
  background: var(--c-teal);
  border-color: var(--c-teal);
}

.page-about .about-rail__toc {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-rail__link {
  display: block;
  padding: 7px 0 7px 14px;
  border-left: 2px solid var(--line-faint);
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-dust);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-snow);
  border-left-color: var(--c-teal);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--c-teal);
  border-left-color: var(--c-teal);
}

.page-about .about-rail__note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 右侧正文 ---------- */
.page-about .about-main {
  min-width: 0;
}

.page-about .about-section {
  padding-bottom: clamp(36px, 6vw, 68px);
  margin-bottom: clamp(28px, 5vw, 52px);
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-section__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-teal);
}

.page-about .about-section__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.2;
  color: var(--c-snow);
}

.page-about .about-lead {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.85;
  color: var(--c-snow);
}

.page-about .about-copy p,
.page-about .about-section__body p,
.page-about .about-cert__point p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-dust);
}

.page-about .about-copy p:last-child,
.page-about .about-section__body p:last-child,
.page-about .about-cert__point p:last-child {
  margin-bottom: 0;
}

.page-about .about-sub {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.01em;
  color: var(--c-snow);
}

.page-about .about-section__body {
  margin-top: 24px;
  padding-left: 16px;
  border-left: 2px solid var(--line-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 22px;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-teal);
  box-shadow: 0 0 0 4px rgba(45, 212, 191, 0.14);
}

.page-about .about-timeline__item:nth-child(2)::before {
  background: var(--c-flag-blue);
  box-shadow: 0 0 0 4px rgba(76, 141, 255, 0.16);
}

.page-about .about-timeline__item:nth-child(3)::before {
  background: var(--c-flag-yellow);
  box-shadow: 0 0 0 4px rgba(244, 201, 93, 0.16);
}

.page-about .about-timeline__item:nth-child(4)::before {
  background: var(--c-flag-green);
  box-shadow: 0 0 0 4px rgba(66, 211, 146, 0.16);
}

.page-about .about-timeline__item:nth-child(5)::before {
  background: var(--c-ember);
  box-shadow: 0 0 0 4px rgba(255, 159, 67, 0.18);
}

.page-about .about-timeline__item:nth-child(6)::before {
  background: var(--c-flag-red);
  box-shadow: 0 0 0 4px rgba(242, 100, 106, 0.18);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-snow);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--c-snow);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-dust);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-team__card {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--panel-fill);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-team__card:hover {
  border-color: var(--c-teal);
  transform: translateY(-2px);
}

.page-about .about-team__num {
  margin: 0 0 6px;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-teal);
}

.page-about .about-team__card:nth-child(2) .about-team__num {
  color: var(--c-ember);
}

.page-about .about-team__card:nth-child(3) .about-team__num {
  color: var(--c-snow);
  font-size: 30px;
}

.page-about .about-team__role {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--c-snow);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-dust);
}

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

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
}

.page-about .figure__caption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 档案 ---------- */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 26px;
}

.page-about .about-archive__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-archive__stat {
  padding: 18px 16px;
  background: var(--c-deep);
}

.page-about .about-archive__value {
  margin: 0 0 6px;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-teal);
}

.page-about .about-archive__stat:nth-child(2) .about-archive__value,
.page-about .about-archive__stat:nth-child(4) .about-archive__value {
  color: var(--c-ember);
}

.page-about .about-archive__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-dust);
}

.page-about .about-archive__figure {
  margin: 0;
  padding: 22px 20px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-m);
  background: rgba(16, 26, 60, 0.5);
}

.page-about .about-archive__svg {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
}

.page-about .about-archive__cell {
  fill: var(--c-teal);
  fill-opacity: 0.16;
  stroke: var(--c-teal);
  stroke-opacity: 0.55;
  stroke-width: 1;
}

.page-about .about-archive__cell:nth-of-type(7n + 1) {
  fill: var(--c-ember);
  fill-opacity: 0.14;
  stroke: var(--c-ember);
  stroke-opacity: 0.5;
}

/* ---------- 协作与荣誉 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-partners__item {
  padding: 20px 18px;
  border-left: 3px solid var(--c-flag-blue);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: rgba(16, 26, 60, 0.55);
}

.page-about .about-partners__item:nth-child(2) {
  border-left-color: var(--c-flag-green);
}

.page-about .about-partners__item:nth-child(3) {
  border-left-color: var(--c-ember);
}

.page-about .about-partners__count {
  margin: 0 0 4px;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-snow);
}

.page-about .about-partners__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-snow);
}

.page-about .about-partners__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-dust);
}

.page-about .about-honor {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid rgba(244, 201, 93, 0.32);
  border-radius: var(--radius-m);
  background: rgba(244, 201, 93, 0.06);
}

.page-about .about-honor .flag-dot {
  margin-top: 6px;
  flex: 0 0 auto;
}

.page-about .about-honor p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-dust);
}

.page-about .about-honor strong {
  color: var(--c-flag-yellow);
  font-weight: 700;
}

/* ---------- 认证 ---------- */
.page-about .about-cert {
  margin-top: 26px;
}

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

.page-about .about-cert__point {
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-next__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-s);
  text-decoration: none;
  color: var(--c-snow);
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--c-teal);
  background: rgba(45, 212, 191, 0.07);
}

.page-about .about-next__index {
  font-size: 13px;
  color: var(--c-teal);
  flex: 0 0 auto;
}

.page-about .about-next__label {
  font-size: 15px;
  line-height: 1.6;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-team__card:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .about-team__card:nth-child(3) {
    margin-top: 10px;
  }

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

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cert__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 28px;
  }

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

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 18px;
    padding-left: 26px;
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
    font-size: 22px;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 96px;
  }

  .page-about .about-section__body {
    padding-left: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card:hover {
    transform: none;
  }
}
<<<END>>>