.page-about {
  --ab-rule: rgba(16, 26, 20, .1);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 26px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--stone);
}

.page-about .breadcrumb__link {
  color: inherit;
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--bamboo);
}

.page-about .breadcrumb__link[aria-current="page"] {
  color: var(--bamboo);
  font-weight: 700;
}

.page-about .breadcrumb__sep {
  color: var(--sand);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 5vw, 52px) 0 clamp(40px, 7vw, 76px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -10vw;
  width: min(70vw, 660px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 68% 34%, rgba(59, 122, 87, .22), rgba(247, 245, 239, 0) 66%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .ab-hero__lead h1 {
  margin: 12px 0 18px;
  font-size: clamp(40px, 10vw, 92px);
  font-weight: 900;
  line-height: .94;
  letter-spacing: -.025em;
}

.page-about .ab-hero__sub {
  max-width: 44ch;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.75;
  color: var(--stone);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__aside {
  position: relative;
  padding-left: 18px;
  border-left: 2px solid var(--bamboo);
}

.page-about .ab-hero__fig {
  margin: 0;
  font-size: clamp(60px, 15vw, 116px);
  font-weight: 700;
  line-height: .82;
  letter-spacing: -.04em;
  color: var(--bamboo);
}

.page-about .ab-hero__figcap {
  margin: 6px 0 18px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--stone);
}

.page-about .ab-hero__facts {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--stone);
}

.page-about .ab-hero__facts .mono {
  display: inline-block;
  min-width: 72px;
  padding: 2px 8px;
  margin-right: 8px;
  border-radius: var(--r-sm);
  background: var(--paper-warm);
  color: var(--forest);
  font-size: 13px;
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .85fr);
    align-items: end;
  }

  .page-about .ab-hero__aside {
    padding-left: 26px;
  }
}

/* ---------- 通用章节 ---------- */
.page-about .ab-section {
  position: relative;
  padding: clamp(42px, 7vw, 88px) 0;
}

.page-about .ab-sec-head {
  max-width: 60ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .ab-sec-head--tight {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .ab-sec-head h2 {
  margin: 10px 0 14px;
  font-size: clamp(27px, 4.6vw, 44px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.015em;
}

.page-about .ab-sec-head p {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--stone);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--bamboo);
  text-transform: uppercase;
}

.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: var(--r-md);
  background: linear-gradient(160deg, var(--forest), var(--ink));
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-frame__cap {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--stone);
}

.page-about .media-frame__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(16, 26, 20, 0) 30%, rgba(16, 26, 20, .78) 100%);
  pointer-events: none;
}

/* ---------- 01 时间轴 ---------- */
.page-about .ab-timeline__fig {
  aspect-ratio: 3 / 2;
  margin-bottom: clamp(30px, 5vw, 52px);
  box-shadow: 0 24px 44px -32px rgba(16, 26, 20, .55);
}

.page-about .ab-track {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--bamboo), var(--moss) 60%, var(--sand));
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 42px);
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 12px;
  width: 16px;
  height: 2px;
  background: var(--moss);
  transition: width .24s var(--ease), background-color .24s var(--ease);
}

.page-about .ab-node::after {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border: 2px solid var(--bamboo);
  border-radius: 50%;
  background: var(--paper);
  transition: background-color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .ab-node:hover::before,
.page-about .ab-node:focus-within::before {
  width: 26px;
  background: var(--sprint);
}

.page-about .ab-node:hover::after,
.page-about .ab-node:focus-within::after {
  background: var(--sprint);
  border-color: var(--sprint);
}

.page-about .ab-node__num {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--bamboo);
  text-transform: uppercase;
}

.page-about .ab-node__title {
  margin: 6px 0 8px;
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 800;
  line-height: 1.28;
}

.page-about .ab-node__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--stone);
}

/* ---------- 02 业务范围 ---------- */
.page-about .ab-scope {
  background: var(--paper-warm);
}

.page-about .ab-scope__grid {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
}

.page-about .ab-scope__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .ab-scope__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid var(--ab-rule);
}

.page-about .ab-scope__num {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--sprint);
}

.page-about .ab-scope__body h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  line-height: 1.3;
}

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

@media (min-width: 960px) {
  .page-about .ab-scope__grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .ab-scope__head {
    position: sticky;
    top: 108px;
    margin-bottom: 0;
  }

  .page-about .ab-scope__item:nth-child(2) {
    margin-left: clamp(0px, 5vw, 64px);
  }

  .page-about .ab-scope__item:nth-child(3) {
    margin-left: clamp(0px, 2vw, 26px);
  }
}

/* ---------- 03 运维（深色转折） ---------- */
.page-about .ab-ops {
  background: var(--forest);
  color: var(--paper);
  padding-top: clamp(52px, 8vw, 100px);
  padding-bottom: clamp(52px, 8vw, 100px);
}

.page-about .ab-ops::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: repeating-linear-gradient(45deg, var(--sprint) 0 14px, var(--bamboo) 14px 28px);
}

.page-about .ab-ops::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 12%, rgba(242, 193, 78, .12), rgba(30, 58, 44, 0) 58%);
  pointer-events: none;
}

.page-about .ab-ops__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-eyebrow--light {
  color: var(--moss);
}

.page-about .ab-ops h2 {
  margin: 10px 0 14px;
  font-size: clamp(27px, 4.6vw, 44px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .ab-ops__lead {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 245, 239, .78);
}

.page-about .ab-ops__rows {
  margin: 0;
}

.page-about .ab-row {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-top: 1px solid var(--line-light);
}

.page-about .ab-row:last-child {
  border-bottom: 1px solid var(--line-light);
}

.page-about .ab-row__key {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--moss);
}

.page-about .ab-row__val {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 245, 239, .92);
}

.page-about .ab-ops__fig {
  aspect-ratio: 4 / 3;
  border-radius: var(--r-md);
}

.page-about .ab-ops__fig .media-frame__cap {
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 14px;
  z-index: 2;
  margin: 0;
  color: rgba(247, 245, 239, .86);
}

@media (min-width: 640px) {
  .page-about .ab-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 940px) {
  .page-about .ab-ops__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
  }

  .page-about .ab-ops__fig {
    aspect-ratio: 3 / 4;
  }
}

/* ---------- 04 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-team__bars {
  display: grid;
  gap: clamp(22px, 3.4vw, 32px);
}

.page-about .ab-bar__label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-bar__label .mono {
  font-size: 15px;
  font-weight: 700;
  color: var(--bamboo);
}

.page-about .ab-bar__track {
  height: 14px;
  border-radius: var(--r-pill);
  background: var(--sand);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
}

.page-about .ab-bar__fill--eng {
  width: 59.6%;
  background: linear-gradient(90deg, var(--bamboo), var(--bamboo-lit));
}

.page-about .ab-bar__fill--cs {
  width: 40.4%;
  background: linear-gradient(90deg, var(--clay), var(--sprint));
}

.page-about .ab-bar__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--stone);
}

.page-about .ab-team__aside {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--r-md);
  background: var(--paper-warm);
  border-left: 3px solid var(--lamp);
  transform: rotate(-.6deg);
}

.page-about .ab-team__aside-title {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
}

.page-about .ab-team__shifts {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .ab-team__shifts .mono {
  display: inline-block;
  min-width: 52px;
  margin-right: 8px;
  padding: 1px 7px;
  border-radius: var(--r-sm);
  background: var(--paper);
  color: var(--forest);
  font-size: 12px;
}

.page-about .ab-team__aside-note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--ab-rule);
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

@media (min-width: 900px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }
}

/* ---------- 05 数据与内容 ---------- */
.page-about .ab-data {
  background: var(--paper-warm);
}

.page-about .ab-data__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-data__fig {
  aspect-ratio: 1 / 1;
  border-radius: var(--r-md);
  box-shadow: 0 26px 46px -34px rgba(16, 26, 20, .5);
}

.page-about .ab-data__text h2 {
  margin: 10px 0 14px;
  font-size: clamp(27px, 4.4vw, 40px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
}

.page-about .ab-data__text > p {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

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

.page-about .ab-data__list li {
  padding: 12px 0;
  border-top: 1px solid var(--ab-rule);
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .ab-data__key {
  display: block;
  margin-bottom: 2px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--bamboo);
}

.page-about .ab-data__link {
  margin: 20px 0 0;
  font-size: 14px;
}

.page-about .ab-data__link a {
  color: var(--forest);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--sprint);
  padding-bottom: 2px;
}

.page-about .ab-data__link a:hover {
  color: var(--sprint);
}

@media (min-width: 900px) {
  .page-about .ab-data__grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: center;
  }

  .page-about .ab-data__list li {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .ab-data__key {
    margin-bottom: 0;
  }
}

/* ---------- 06 数字条带 ---------- */
.page-about .ab-numbers {
  background: var(--ink);
  color: var(--paper);
  padding-bottom: 0;
}

.page-about .ab-numbers .eyebrow {
  color: var(--moss);
}

.page-about .ab-numbers h2 {
  margin: 10px 0 14px;
  font-size: clamp(27px, 4.6vw, 44px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .ab-numbers .ab-sec-head p {
  color: rgba(247, 245, 239, .72);
}

.page-about .ab-band {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  padding: 0 var(--pad) clamp(34px, 5vw, 56px);
  margin-top: 8px;
}

.page-about .ab-band__list {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  width: max-content;
}

.page-about .ab-band__item {
  scroll-snap-align: start;
  flex: 0 0 auto;
  width: clamp(180px, 46vw, 240px);
  padding: 20px 18px 22px;
  border-radius: var(--r-md);
  border-top: 4px solid var(--bamboo);
  background: rgba(247, 245, 239, .06);
}

.page-about .ab-band__item:nth-child(2n) {
  border-top-color: var(--sprint);
  transform: rotate(-.8deg);
}

.page-about .ab-band__item:nth-child(3n) {
  border-top-color: var(--lamp);
  transform: rotate(.7deg);
}

.page-about .ab-band__num {
  margin: 0 0 10px;
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .ab-band__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 245, 239, .72);
}

/* ---------- 07 站点信息 ---------- */
.page-about .ab-info {
  background: var(--paper);
}

.page-about .ab-info__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-info__text h2 {
  margin: 10px 0 14px;
  font-size: clamp(26px, 4.2vw, 38px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.015em;
}

.page-about .ab-info__text p {
  margin: 0;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .ab-info__text .mono {
  color: var(--forest);
  font-weight: 700;
  word-break: break-word;
}

.page-about .ab-info__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-info__meta {
  margin: 0;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--r-md);
  background: var(--paper-warm);
  align-self: start;
}

.page-about .ab-info__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-top: 1px dashed rgba(16, 26, 20, .16);
}

.page-about .ab-info__row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-info__row dt {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--stone);
}

.page-about .ab-info__row dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  word-break: break-word;
}

@media (min-width: 860px) {
  .page-about .ab-info__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node::before,
  .page-about .ab-node::after {
    transition: none;
  }

  .page-about .ab-team__aside,
  .page-about .ab-band__item {
    transform: none;
  }
}
<<<END>>>