.page-about {
  --about-gap: clamp(56px, 9vw, 112px);
  --about-edge: clamp(22px, 4vw, 52px);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 22px;
  padding-bottom: 6px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(36px, 5vw, 64px);
}

.page-about .about-hero .frame {
  margin: 0;
}

.page-about .about-hero__inner {
  padding: clamp(26px, 4.4vw, 54px);
}

.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.26;
  font-size: clamp(27px, 4vw, 44px);
  color: var(--ink);
  margin: 14px 0 0;
  max-width: 20em;
}

.page-about .about-hero .lede {
  margin-top: 18px;
  max-width: 36em;
  color: var(--ink);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 22px;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--mist);
}

.page-about .about-hero__stat .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 34px);
  letter-spacing: .04em;
  line-height: 1.08;
  color: var(--ink);
}

.page-about .about-hero__stat .metric__value--gold {
  color: var(--gold);
}

.page-about .about-hero__unit {
  font-size: .52em;
  margin-left: 4px;
  letter-spacing: .06em;
  color: var(--stone);
}

.page-about .about-hero__stat .metric__label {
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--stone);
}

/* ---------- 通用标题 ---------- */
.page-about h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.32;
  font-size: clamp(21px, 2.9vw, 31px);
  color: var(--ink);
  margin: 10px 0 0;
}

.page-about h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.36;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--ink);
  margin: 0;
}

/* ---------- 起点 ---------- */
.page-about .about-start {
  padding-top: var(--about-gap);
}

.page-about .about-start__media {
  margin: 0 0 clamp(30px, 4.6vw, 54px);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: linear-gradient(150deg, var(--deep) 0%, var(--deep-2) 100%);
}

.page-about .about-start__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(.82);
}

.page-about .about-start__body p {
  margin-top: 16px;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--ink);
}

/* ---------- 横向时间轴 ---------- */
.page-about .about-timeline {
  padding-top: var(--about-gap);
}

.page-about .era-rail {
  margin-top: clamp(30px, 4.6vw, 52px);
}

.page-about .era-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  position: relative;
}

.page-about .era-rail__list::before {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  top: 6px;
  height: 1px;
  background: var(--mist);
}

.page-about .era-rail__item {
  position: relative;
  min-width: 0;
}

.page-about .era-rail__link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: inherit;
  padding-top: 0;
}

.page-about .era-rail__dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  background: var(--gold);
  box-shadow: 0 0 0 5px var(--sand);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .era-rail__dot--indigo { background: var(--indigo); }
.page-about .era-rail__dot--crimson { background: var(--crimson); }

.page-about .era-rail__link:hover .era-rail__dot,
.page-about .era-rail__link:focus-visible .era-rail__dot {
  transform: scale(1.22);
  box-shadow: 0 0 0 6px var(--sand), 0 0 0 7px var(--gold);
}

.page-about .era-rail__when {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--stone);
}

.page-about .era-rail__label {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15.5px;
  line-height: 1.4;
  color: var(--ink);
  transition: color 160ms var(--ease);
}

.page-about .era-rail__link:hover .era-rail__label,
.page-about .era-rail__link:focus-visible .era-rail__label {
  color: var(--gold);
}

/* ---------- 阶段细读 ---------- */
.page-about .about-eras {
  padding-top: clamp(30px, 4.4vw, 52px);
}

.page-about .about-eras__flow {
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 4.6vw, 52px);
}

.page-about .era {
  padding-left: clamp(16px, 2.6vw, 28px);
  border-left: 2px solid var(--mist);
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .era:hover {
  border-left-color: var(--gold);
}

.page-about .era__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
  margin: 0;
}

.page-about .era__title {
  margin-top: 8px;
}

.page-about .era__text {
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.86;
  color: var(--ink);
}

/* ---------- 记录整理岗 ---------- */
.page-about .about-team {
  padding-top: var(--about-gap);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  background: linear-gradient(160deg, var(--sand-2) 0%, var(--mist) 100%);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: saturate(.78);
}

.page-about .about-team__body p {
  margin-top: 16px;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--ink);
}

.page-about .about-team__facts {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-team__facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--mist);
  font-size: 15px;
  color: var(--stone);
}

.page-about .about-team__facts .num {
  font-family: var(--font-mono);
  font-size: 21px;
  letter-spacing: .04em;
  color: var(--indigo);
  min-width: 2.4em;
}

/* ---------- 服务半径 ---------- */
.page-about .about-reach {
  padding-top: var(--about-gap);
}

.page-about .about-reach__media {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  background: linear-gradient(120deg, var(--mist) 0%, var(--sand-2) 100%);
}

.page-about .about-reach__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 3;
  object-fit: cover;
  filter: saturate(.6) contrast(.96);
}

.page-about .about-reach__media .media__cap {
  padding: 12px 6px 0;
  font-size: 13.5px;
  color: var(--stone);
}

.page-about .about-reach__band {
  margin-top: clamp(26px, 3.8vw, 44px);
  padding: clamp(30px, 4.8vw, 58px) var(--about-edge);
  border-radius: var(--radius-l);
  background: linear-gradient(158deg, var(--deep) 0%, var(--deep-2) 100%);
}

.page-about .about-reach__band h2 {
  color: var(--sand);
  margin-top: 12px;
}

.page-about .about-reach__lede {
  margin-top: 16px;
  font-size: 16.5px;
  line-height: 1.86;
  color: rgba(244, 238, 228, .84);
  max-width: 34em;
}

.page-about .about-reach__cities {
  list-style: none;
  margin: clamp(22px, 3.2vw, 32px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-reach__cities li {
  padding: 6px 14px;
  border: 1px solid rgba(200, 214, 210, .3);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .06em;
  color: var(--sand);
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .about-reach__cities li:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.page-about .about-reach__grid {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-reach__cell {
  padding-top: 16px;
  border-top: 1px solid rgba(200, 214, 210, .22);
}

.page-about .about-reach__key {
  margin: 0;
  font-size: 13.5px;
  letter-spacing: .06em;
  color: rgba(244, 238, 228, .68);
}

.page-about .about-reach__val {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.4vw, 50px);
  line-height: 1.04;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .about-reach__note {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 238, 228, .78);
}

/* ---------- 资质 ---------- */
.page-about .about-cred {
  padding-top: var(--about-gap);
}

.page-about .cred-list {
  margin-top: clamp(24px, 3.4vw, 38px);
  border-top: 1px solid var(--mist);
}

.page-about .cred-list .accordion__item {
  border-bottom: 1px solid var(--mist);
}

.page-about .cred-list__head {
  margin: 0;
  font-size: inherit;
}

.page-about .cred-list__btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(18px, 2.4vw, 24px) 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.page-about .cred-list__key {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .cred-list__name {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.4;
  color: var(--ink);
  transition: color 160ms var(--ease);
}

.page-about .cred-list__btn:hover .cred-list__name,
.page-about .cred-list__btn:focus-visible .cred-list__name {
  color: var(--indigo);
}

.page-about .cred-list__glyph {
  flex: none;
  width: 11px;
  height: 11px;
  border-right: 1.5px solid var(--stone);
  border-bottom: 1.5px solid var(--stone);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 200ms var(--ease);
}

.page-about .cred-list__btn[aria-expanded="true"] .cred-list__glyph {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .cred-list .accordion__panel-inner {
  padding: 0 0 clamp(18px, 2.4vw, 26px);
  max-width: 62ch;
}

.page-about .cred-list .accordion__panel-inner p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--stone);
}

/* ---------- 结尾指向 ---------- */
.page-about .about-cta {
  margin-top: var(--about-gap);
  padding-bottom: clamp(52px, 7vw, 92px);
}

.page-about .about-cta__inner {
  border-top: 1px solid var(--mist);
  padding-top: clamp(26px, 4vw, 44px);
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.5vw, 26px);
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-cta__sub {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 40em;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-reach__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px;
  }

  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 32px;
  }

  .page-about .about-cta__actions {
    flex: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    align-items: start;
    gap: clamp(34px, 5vw, 64px);
  }
}

@media (max-width: 719px) {
  .page-about .era-rail__list {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-about .era-rail__list::before {
    left: 6px;
    right: auto;
    top: 12px;
    bottom: 12px;
    width: 1px;
    height: auto;
  }

  .page-about .era-rail__link {
    flex-direction: row;
    align-items: center;
    gap: 14px;
    padding: 12px 0;
  }

  .page-about .era-rail__dot {
    flex: none;
    box-shadow: 0 0 0 4px var(--sand);
  }

  .page-about .era-rail__when {
    flex: none;
    min-width: 4.2em;
  }

  .page-about .era-rail__label {
    font-size: 16px;
  }

  .page-about .about-start__media img {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-reach__media img {
    aspect-ratio: 5 / 4;
  }

  .page-about .about-team__media img {
    aspect-ratio: 4 / 3;
  }
}
<<<END>>>