.page-about {
  --about-rail-w: 200px;
  --about-gap: clamp(1.2rem, 4vw, 3rem);
  display: block;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .crumbs {
  padding-top: clamp(.9rem, 2.6vw, 1.5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(1.2rem, 3.6vw, 2.4rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: .9rem;
  max-width: 58rem;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(1.85rem, 5.6vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -.005em;
  color: var(--snow);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46rem;
  font-size: clamp(.98rem, 2.2vw, 1.08rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .6rem;
  margin: .35rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stat {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .45rem .95rem;
  border: 1px solid var(--night-2);
  border-radius: var(--pill);
  background: var(--night-1);
}

.page-about .about-hero__stat b {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--amber);
}

.page-about .about-hero__stat span {
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-hero__media {
  margin: clamp(1.3rem, 3.6vw, 2.4rem) 0 0;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-lg);
  border: 1px solid var(--night-2);
  background: var(--night-1);
  overflow: hidden;
}

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

/* ---------- 分栏骨架 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1.3rem;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding-bottom: .7rem;
  border-bottom: 1px solid var(--night-2);
}

.page-about .about-rail__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--muted);
}

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

.page-about .about-body > * + * {
  margin-top: 1.1rem;
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(1.28rem, 3.4vw, 1.82rem);
  line-height: 1.28;
  color: var(--snow);
}

.page-about .about-body > p {
  margin: 0;
  max-width: 62ch;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  border-radius: var(--r-lg);
  border: 1px solid var(--night-2);
  background: var(--night-1);
  overflow: hidden;
}

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

.page-about .about-crew {
  display: grid;
  gap: .7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__item {
  padding: 1.05rem 1.15rem 1.15rem;
  border-radius: var(--r-md);
  border: 1px solid var(--night-2);
  background: var(--night-1);
  transition: border-color .28s ease, background-color .28s ease;
}

.page-about .about-crew__item:hover {
  border-color: var(--mid-blue);
}

.page-about .about-crew__num {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .about-crew__role {
  margin: 0 0 .45rem;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--snow);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 流程步骤 ---------- */
.page-about .about-flow {
  display: grid;
  gap: .15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: .85rem;
  align-items: start;
  padding: .9rem .85rem;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  transition: background-color .3s ease, border-color .3s ease;
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  background: var(--night-1);
  border-color: var(--night-2);
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--mid-blue);
  transition: color .3s ease;
}

.page-about .about-flow__step:hover .about-flow__num,
.page-about .about-flow__step:focus-within .about-flow__num {
  color: var(--amber);
}

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

.page-about .about-flow__title {
  margin: 0 0 .3rem;
  font-size: .98rem;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-flow__text {
  margin: 0;
  max-width: 60ch;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--muted);
  transition: color .3s ease;
}

.page-about .about-flow__step:hover .about-flow__text,
.page-about .about-flow__step:focus-within .about-flow__text {
  color: var(--snow);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__media {
  margin: 0;
  aspect-ratio: 21 / 9;
  border-radius: var(--r-lg);
  border: 1px solid var(--night-2);
  background: var(--night-1);
  overflow: hidden;
}

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

.page-about .about-timeline {
  display: grid;
  gap: .35rem;
  margin: 0;
  padding: 0 0 0 1.1rem;
  list-style: none;
  border-left: 1px solid var(--night-2);
}

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

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: calc(-1.1rem - 4.5px);
  top: 1.15rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--night-2);
  transition: background-color .3s ease, box-shadow .3s ease;
}

.page-about .about-era[data-open]::before,
.page-about .about-era:hover::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 160, 61, .16);
}

.page-about .about-era__trigger {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr) auto;
  align-items: center;
  gap: .7rem;
  width: 100%;
  padding: .8rem .8rem;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  background: transparent;
  font: inherit;
  text-align: left;
  color: inherit;
  cursor: pointer;
  transition: background-color .3s ease, border-color .3s ease;
}

.page-about .about-era__trigger:hover,
.page-about .about-era[data-open] .about-era__trigger {
  background: var(--night-1);
  border-color: var(--night-2);
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .about-era__name {
  font-size: .96rem;
  font-weight: 500;
  color: var(--snow);
}

.page-about .about-era__mark {
  position: relative;
  justify-self: end;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .about-era__mark::before,
.page-about .about-era__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  background: var(--muted);
  transition: transform .3s ease, background-color .3s ease;
}

.page-about .about-era__mark::after {
  transform: rotate(90deg);
}

.page-about .about-era[data-open] .about-era__mark::after {
  transform: rotate(0deg);
}

.page-about .about-era[data-open] .about-era__mark::before,
.page-about .about-era[data-open] .about-era__mark::after {
  background: var(--amber);
}

.page-about .about-era__panel {
  padding: .1rem .9rem 1.05rem .8rem;
}

.page-about .about-era__panel p {
  margin: 0;
  max-width: 58ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 覆盖数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: .7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  padding: 1.1rem 1rem 1.2rem;
  border-radius: var(--r-lg);
  border: 1px solid var(--night-2);
  background: linear-gradient(158deg, var(--night-1), var(--night));
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 4vw, 1.95rem);
  font-weight: 600;
  line-height: 1;
  color: var(--snow);
}

.page-about .about-stat__unit {
  margin-left: .12em;
  font-size: .52em;
  color: var(--amber);
}

.page-about .about-stat__label {
  display: block;
  margin-top: .6rem;
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 服务节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: .2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cadence__item {
  display: grid;
  gap: .3rem;
  padding: .85rem .95rem;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  border-left: 2px solid var(--night-2);
  transition: border-color .3s ease, background-color .3s ease;
}

.page-about .about-cadence__item:hover {
  border-left-color: var(--amber);
  background: var(--night-1);
}

.page-about .about-cadence__key {
  margin: 0;
  font-size: .95rem;
  font-weight: 600;
  color: var(--snow);
}

.page-about .about-cadence__val {
  margin: 0;
  max-width: 60ch;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-contact-line {
  margin: 0;
  max-width: 62ch;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-contact-line a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 160, 61, .45);
}

.page-about .about-contact-line a:hover {
  border-bottom-color: var(--amber);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.4rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-era__trigger {
    grid-template-columns: 4.6rem minmax(0, 1fr) auto;
    gap: 1rem;
    padding: .9rem 1rem;
  }

  .page-about .about-era__panel {
    padding: .15rem 1rem 1.15rem 6.1rem;
  }

  .page-about .about-flow__step {
    grid-template-columns: 3rem minmax(0, 1fr);
    padding: 1rem 1.05rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    position: sticky;
    top: 6rem;
    align-self: start;
    padding: 0 0 0 1rem;
    border-bottom: 0;
    border-left: 1px solid var(--night-2);
  }

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

  .page-about .about-timeline__media {
    aspect-ratio: 21 / 9;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__item,
  .page-about .about-flow__step,
  .page-about .about-flow__num,
  .page-about .about-flow__text,
  .page-about .about-era::before,
  .page-about .about-era__trigger,
  .page-about .about-era__mark::before,
  .page-about .about-era__mark::after,
  .page-about .about-cadence__item {
    transition: none;
  }
}
<<<END>>>