.page-about {
  --ab-axis: 96px;
  --ab-line: 1px solid rgba(20, 24, 31, 0.16);
  display: block;
  background: var(--soil);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding: 20px 0 0;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: 16px 0 0;
}

.page-about .about-hero__box {
  position: relative;
  display: grid;
  gap: 24px;
  background: var(--white);
  border: 1px solid var(--ink);
  padding: 28px 20px 30px;
}

.page-about .about-hero__box::before,
.page-about .about-hero__box::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.page-about .about-hero__box::before {
  top: -1px;
  left: -1px;
  border-top: 4px solid var(--cobalt);
  border-left: 4px solid var(--cobalt);
}

.page-about .about-hero__box::after {
  right: -1px;
  bottom: -1px;
  border-bottom: 4px solid var(--orange);
  border-right: 4px solid var(--orange);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--loam);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 20px;
  height: 3px;
  background: var(--orange);
  flex: none;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(30px, 7.6vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-hero__lead--tight {
  margin-top: 14px;
  padding-top: 14px;
  border-top: var(--ab-line);
  color: var(--loam);
}

/* ---------- 横向刻度尺 ---------- */
.page-about .about-ruler {
  position: relative;
  height: 20px;
  margin: 26px 0 0;
  background-image: repeating-linear-gradient(
    to right,
    rgba(20, 24, 31, 0.22) 0 1px,
    transparent 1px 8px
  );
}

.page-about .about-ruler::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 10px;
  height: 9px;
  background-image: repeating-linear-gradient(
    to right,
    rgba(20, 24, 31, 0.55) 0 1px,
    transparent 1px 64px
  );
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-head {
  margin-bottom: 26px;
  max-width: 46em;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--loam);
}

.page-about .about-kicker::before {
  content: "";
  width: 18px;
  height: 8px;
  background: var(--cobalt);
  flex: none;
}

.page-about .about-head h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 5.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-head__lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 发展路径 ---------- */
.page-about .about-history__figure {
  margin: 0 0 32px;
}

.page-about .about-timeline {
  display: grid;
  gap: 22px;
}

.page-about .about-years {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: var(--ab-line);
}

.page-about .about-year {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--loam);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-year::before {
  content: "";
  width: 12px;
  height: 2px;
  background: currentColor;
  flex: none;
}

.page-about .about-year:hover,
.page-about .about-year:focus-visible {
  background: var(--cobalt-soft);
  border-color: var(--cobalt);
  color: var(--cobalt);
}

.page-about .about-eras {
  display: grid;
  gap: 14px;
}

.page-about .about-era {
  position: relative;
  scroll-margin-top: 96px;
  background: var(--white);
  border: 1px solid var(--ink);
  padding: 22px 20px 22px 26px;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--cobalt);
}

.page-about .about-era:nth-child(2)::before {
  background: var(--cobalt);
}

.page-about .about-era:nth-child(3)::before {
  background: var(--cyan);
}

.page-about .about-era:nth-child(4)::before {
  background: var(--orange);
}

.page-about .about-era:first-child::before {
  background: var(--loam);
}

.page-about .about-era:hover {
  transform: translateX(4px);
}

.page-about .about-era__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-era__year {
  display: inline-block;
  padding: 3px 9px;
  background: var(--ink);
  color: var(--soil);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
}

.page-about .about-era__head h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-era p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}

/* ---------- 业务构成 ---------- */
.page-about .about-biz {
  background: var(--clay);
}

.page-about .about-biz__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-biz__card {
  background: var(--white);
  border: 1px solid var(--ink);
  padding: 22px 20px;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-biz__card:hover,
.page-about .about-biz__card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cobalt);
}

.page-about .about-biz__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .about-biz__no {
  font-size: 26px;
  font-weight: 700;
  color: var(--cobalt);
  letter-spacing: -0.01em;
}

.page-about .about-biz__card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-biz__card > p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .about-biz__meta {
  margin: 0;
  padding-top: 14px;
  border-top: var(--ab-line);
  display: grid;
  gap: 4px;
}

.page-about .about-biz__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--loam);
}

.page-about .about-biz__meta dd {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-biz__meta dd:last-child {
  margin-bottom: 0;
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  background: var(--ink);
  color: var(--soil);
  padding: 44px 0;
}

.page-about .about-band__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 20px;
}

.page-about .about-band__item {
  border-left: 2px solid rgba(245, 241, 232, 0.24);
  padding-left: 14px;
}

.page-about .about-band__num {
  display: block;
  font-size: clamp(24px, 6vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-band__item:nth-child(2) .about-band__num {
  color: var(--orange);
}

.page-about .about-band__item:nth-child(4) .about-band__num {
  color: var(--white);
}

.page-about .about-band__label {
  display: block;
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--soil);
}

.page-about .about-band__note {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.68);
}

.page-about .about-band__foot {
  margin: 28px 0 0;
  padding-top: 18px;
  border-top: var(--hair-dark);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.78);
}

/* ---------- 团队分工 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-team__roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: var(--ab-line);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: var(--ab-line);
}

.page-about .about-role__k {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cobalt);
  padding-top: 4px;
}

.page-about .about-role__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.01em;
}

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

.page-about .about-team__figure {
  margin: 0;
}

/* ---------- 协作网络 ---------- */
.page-about .about-net {
  background: var(--cobalt-soft);
}

.page-about .about-net__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-net__figure {
  margin: 0;
}

.page-about .about-net__map {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  margin: 0 0 20px;
}

.page-about .about-net__regions {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 1px solid rgba(20, 24, 31, 0.14);
}

.page-about .about-net__regions li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid rgba(20, 24, 31, 0.14);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-net__regions .mono {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cobalt);
}

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

/* ---------- 服务标准 ---------- */
.page-about .about-std__list {
  list-style: none;
  counter-reset: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 2px solid var(--ink);
}

.page-about .about-std__item {
  position: relative;
  padding: 22px 20px 22px 24px;
  background: var(--white);
  border-bottom: var(--ab-line);
}

.page-about .about-std__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--ink);
}

.page-about .about-std__item:nth-child(2)::before {
  background: var(--cobalt);
}

.page-about .about-std__item:nth-child(3)::before {
  background: var(--orange);
}

.page-about .about-std__no {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--loam);
}

.page-about .about-std__item h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-std__item p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-end {
  padding: 0 0 64px;
}

.page-about .about-end__inner {
  position: relative;
  display: grid;
  gap: 22px;
  background: var(--ink);
  color: var(--soil);
  padding: 34px 22px 36px;
  border-left: 6px solid var(--orange);
}

.page-about .about-end__left h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 4.6vw, 32px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-end__left p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.78);
}

.page-about .about-end__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

  .page-about .about-hero__box {
    padding: 32px 28px 34px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 24px 0 0;
  }

  .page-about .about-hero__box {
    grid-template-columns: 7fr 5fr;
    gap: 44px;
    padding: 48px 40px 46px;
  }

  .page-about .about-hero__right {
    padding-left: 32px;
    border-left: var(--ab-line);
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-head {
    margin-bottom: 36px;
  }

  .page-about .about-timeline {
    grid-template-columns: var(--ab-axis) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-years {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-year {
    width: 100%;
  }

  .page-about .about-era {
    padding: 26px 28px 26px 32px;
  }

  .page-about .about-era:nth-child(2) {
    margin-left: 8px;
  }

  .page-about .about-era:nth-child(3) {
    margin-left: 16px;
  }

  .page-about .about-era:nth-child(4) {
    margin-left: 24px;
  }

  .page-about .about-band {
    padding: 56px 0;
  }

  .page-about .about-band__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .about-net__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 44px;
    align-items: start;
  }

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

  .page-about .about-std__item {
    border-bottom: 0;
    border-left: var(--ab-line);
    padding: 26px 24px 26px 26px;
  }

  .page-about .about-std__item:first-child {
    border-left: 0;
  }

  .page-about .about-end__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
    padding: 44px 40px;
  }

  .page-about .about-end__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1160px) {
  .page-about .about-hero__title {
    font-size: 60px;
  }
}
<<<END>>>
</main>