.page-about {
  --about-rail-w: 168px;
  --about-rail-gap: clamp(1.5rem, 3.6vw, 3.5rem);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 1.15rem;
  padding-bottom: clamp(2.25rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero .section__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(2rem, 6.2vw, 4.25rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.35vw, 1.125rem);
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: .75rem 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__stat {
  padding: 1rem 1.15rem;
  background: var(--mine);
}

.page-about .about-hero__stat dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-hero__stat dd {
  margin: .4rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--gold);
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 2rem;
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
    align-items: start;
  }
}

/* ---------- 左侧年份刻度 ---------- */
.page-about .about-rail__title {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-rail .anchor-rail {
  display: flex;
  gap: .25rem;
  overflow-x: auto;
  padding-bottom: .4rem;
  scrollbar-width: thin;
}

@media (min-width: 960px) {
  .page-about .about-rail .anchor-rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .about-rail .anchor-rail__link {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  padding: .5rem .7rem;
  border-left: 2px solid transparent;
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  font-size: .8125rem;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

@media (min-width: 960px) {
  .page-about .about-rail .anchor-rail__link {
    padding: .58rem .15rem;
  }
}

.page-about .about-rail .anchor-rail__link:hover,
.page-about .about-rail .anchor-rail__link:focus-visible {
  color: var(--mist);
  border-left-color: var(--line-neon);
}

.page-about .about-rail .anchor-rail__link[aria-current],
.page-about .about-rail .anchor-rail__link.is-active {
  color: var(--mist);
  border-left-color: var(--gold);
}

.page-about .about-rail__year {
  flex: none;
  min-width: 2.7em;
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 600;
  color: var(--gold);
}

/* ---------- 右侧正文列 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(2.75rem, 6vw, 4.5rem);
  min-width: 0;
}

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

.page-about .about-body .section__head {
  position: relative;
  margin: 0 0 1.35rem;
  padding-left: 1.15rem;
}

.page-about .about-body .section__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: .2em;
  width: 2px;
  height: 0;
  background: linear-gradient(180deg, var(--neon), rgba(53, 230, 210, .12));
  transition: height .65s var(--ease);
}

.page-about .about-body .section__head.is-visible::before {
  height: calc(100% - .4em);
}

.page-about .about-body .section__kicker {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-body .section__title {
  margin: 0;
  max-width: 28ch;
  font-size: clamp(1.4rem, 3.2vw, 2.05rem);
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--mist);
}

/* ---------- 正文段落 ---------- */
.page-about .about-copy p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--slate);
}

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

.page-about .about-link {
  color: var(--lake-light);
  text-decoration: underline;
  text-decoration-color: rgba(143, 203, 242, .4);
  text-underline-offset: .22em;
  transition: color .25s var(--ease), text-decoration-color .25s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--neon);
  text-decoration-color: var(--neon);
}

/* ---------- 起点：主文＋旁注 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 15.5rem);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }
}

.page-about .about-aside {
  padding: 1.1rem 1.2rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(165deg, rgba(15, 42, 68, .85), rgba(6, 26, 46, .55));
}

.page-about .about-aside__title {
  margin: 0 0 .8rem;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-aside__list {
  margin: 0;
  padding-left: 1.05rem;
  display: grid;
  gap: .65rem;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-aside__list li::marker {
  color: var(--neon);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 1.5rem 0 1.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(15, 42, 68, .45);
}

.page-about .figure__media {
  position: relative;
  overflow: hidden;
  background:
    repeating-linear-gradient(90deg, rgba(147, 166, 186, .07) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(147, 166, 186, .07) 0 1px, transparent 1px 64px),
    radial-gradient(130% 110% at 18% 0%, rgba(46, 127, 212, .38), transparent 62%),
    var(--mine);
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__caption {
  padding: .85rem 1.1rem;
  border-top: 1px solid var(--line);
  font-size: .8125rem;
  line-height: 1.68;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 2.25rem;
  list-style: none;
  display: grid;
  gap: .7rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 1.8rem;
  bottom: 1.8rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(147, 166, 186, .12), var(--line-neon) 42%, rgba(147, 166, 186, .12));
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-node {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 42, 68, .4);
  transition: border-color .3s var(--ease), background-color .3s var(--ease);
}

.page-about .about-node[open] {
  border-color: var(--line-neon);
  background: rgba(15, 42, 68, .78);
}

.page-about .about-node__summary {
  position: relative;
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .95rem 1.15rem;
  cursor: pointer;
  list-style: none;
  color: var(--mist);
}

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

.page-about .about-node__summary::marker {
  content: "";
}

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.page-about .about-node__dot {
  position: absolute;
  left: calc(-2.25rem + 3px);
  top: 50%;
  transform: translateY(-50%);
  width: 13px;
  height: 13px;
  border: 1px solid var(--slate);
  border-radius: 2px;
  background: var(--deep-sea);
  z-index: 1;
  transition: border-color .3s var(--ease), background-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-node[open] .about-node__dot {
  border-color: var(--neon);
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(53, 230, 210, .13);
}

.page-about .about-node__year {
  flex: none;
  min-width: 3.4em;
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 600;
  color: var(--gold);
}

.page-about .about-node__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -.005em;
  color: var(--mist);
}

.page-about .about-node__body {
  padding: .9rem 1.15rem 1.15rem;
  border-top: 1px dashed var(--line);
}

.page-about .about-node__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-footnote {
  margin: 1.5rem 0 0;
  padding-left: 1.15rem;
  border-left: 1px solid var(--line);
  font-size: .875rem;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 800px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-team__card {
  position: relative;
  padding: 1.4rem 1.25rem 1.5rem;
  background: var(--deep-sea);
  transition: background-color .3s var(--ease);
}

.page-about .about-team__card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), rgba(53, 230, 210, 0));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .4s var(--ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  background: var(--mine);
}

.page-about .about-team__card:hover::after,
.page-about .about-team__card:focus-within::after {
  transform: scaleX(1);
}

.page-about .about-team__index {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-team__name {
  margin: 0 0 .6rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-team__text {
  margin: 0 0 .9rem;
  font-size: .9375rem;
  line-height: 1.76;
  color: var(--slate);
}

.page-about .about-team__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .14em;
  color: rgba(147, 166, 186, .72);
}

/* ---------- 更新节奏数字 ---------- */
.page-about .about-metrics {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (min-width: 700px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-metric {
  padding: 1.25rem 1.2rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(162deg, rgba(15, 42, 68, .92), rgba(6, 26, 46, .5));
}

.page-about .about-metric__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.25rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .about-metric__value sup {
  font-size: .42em;
  font-weight: 500;
  vertical-align: super;
  margin-left: .28em;
  letter-spacing: .04em;
  color: var(--slate);
}

.page-about .about-metric__label {
  margin: .8rem 0 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 服务范围 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 860px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: center;
  }
}

.page-about .about-coverage .about-figure {
  margin: 0;
}

.page-about .about-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .95rem;
}

.page-about .about-list li {
  position: relative;
  padding-left: 1.6rem;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .6em;
  width: 7px;
  height: 7px;
  border: 1px solid var(--neon);
  border-radius: 1px;
}

/* ---------- 长期使用 ---------- */
.page-about .about-value {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 780px) {
  .page-about .about-value {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-value__item {
  padding: 1.35rem 1.25rem 1.5rem;
  background: var(--deep-sea);
}

.page-about .about-value__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .22em;
  color: var(--neon);
}

.page-about .about-value__title {
  margin: .75rem 0 .55rem;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .about-value__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.76;
  color: var(--slate);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1.1rem;
  margin-top: clamp(2rem, 4.5vw, 3rem);
  padding: 1.4rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 160% at 90% 0%, rgba(46, 127, 212, .28), transparent 62%),
    rgba(15, 42, 68, .62);
}

@media (min-width: 720px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.5rem;
  }
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40ch;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--mist);
}

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

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node__dot,
  .page-about .about-team__card,
  .page-about .about-team__card::after,
  .page-about .about-body .section__head::before,
  .page-about .about-rail .anchor-rail__link {
    transition: none;
  }

  .page-about .about-team__card::after {
    transform: scaleX(0);
  }
}
</PAGE_CSS>