.page-about {
  --about-h1: clamp(30px, 5vw, 64px);
}

.page-about .about-crumb {
  padding: 18px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 40px) 0 clamp(36px, 5vw, 64px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 72vw;
  max-width: 900px;
  height: 78vh;
  background: radial-gradient(ellipse at top right, rgba(56, 242, 208, 0.16), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-kicker {
  margin: 0 0 16px;
  font-family: var(--font-num);
  font-size: var(--step-tiny);
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--about-h1);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 34em;
  font-size: var(--step-body);
  line-height: 1.85;
  color: rgba(242, 239, 230, 0.78);
}

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

/* 概况牌 */
.page-about .about-board {
  position: relative;
  padding: 18px 18px 8px;
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
}

.page-about .about-board::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-deep) 55%, transparent);
}

.page-about .about-board__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ink-2);
}

.page-about .about-board__label {
  font-family: var(--font-num);
  font-size: var(--step-tiny);
  letter-spacing: 0.2em;
  color: var(--stone);
}

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

.page-about .about-board__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(42, 49, 54, 0.85);
}

.page-about .about-board__row:last-child {
  border-bottom: none;
}

.page-about .about-board__row dt {
  font-size: var(--step-meta);
  color: var(--stone);
}

.page-about .about-board__row dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: 15px;
  color: var(--bone);
}

.page-about .about-num {
  color: var(--cyan);
  font-weight: 600;
}

/* ---------- 主体栅格与侧边刻度 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 0;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 12px;
  border-left: 1px solid var(--ink-2);
  display: grid;
  gap: 18px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  color: var(--stone);
}

.page-about .about-rail__no {
  font-family: var(--font-editorial);
  font-size: 17px;
  color: var(--stone);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-rail__tx {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--stone);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-rail__link:hover .about-rail__no,
.page-about .about-rail__link:hover .about-rail__tx,
.page-about .about-rail__link:focus-visible .about-rail__no,
.page-about .about-rail__link:focus-visible .about-rail__tx {
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(34px, 5vw, 60px) 0;
  border-top: 1px solid var(--ink-2);
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-sec__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-sec__band {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  justify-self: start;
  padding: 5px 20px 5px 12px;
  background: linear-gradient(90deg, rgba(18, 110, 99, 0.8), rgba(18, 110, 99, 0));
  clip-path: polygon(0 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-sec__no {
  font-family: var(--font-editorial);
  font-size: 22px;
  line-height: 1;
  color: var(--bone);
}

.page-about .about-sec__eyebrow {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .about-sec__lead {
  max-width: 34em;
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: var(--step-body);
  line-height: 1.85;
  color: rgba(242, 239, 230, 0.72);
}

.page-about .about-prose {
  max-width: 36em;
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: var(--step-body);
  line-height: 1.9;
  color: rgba(242, 239, 230, 0.8);
}

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

.page-about .about-quote {
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 6px 0 6px 22px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.65;
  color: var(--bone);
}

/* ---------- 岗位档案卡 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-role {
  position: relative;
  padding: 20px 20px 18px 24px;
  background: var(--bone);
  color: var(--ink-0);
  border-left: 4px solid var(--clay);
  box-shadow: 6px 6px 0 rgba(242, 239, 230, 0.12), 12px 12px 0 rgba(242, 239, 230, 0.05);
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease),
    border-color var(--t-fast) var(--ease);
}

.page-about .about-role:hover {
  border-left-color: var(--cyan-deep);
}

.page-about .about-role__title {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--ink-0);
}

.page-about .about-role__duty {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(10, 12, 13, 0.8);
}

.page-about .about-role__handoff {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(10, 12, 13, 0.25);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(10, 12, 13, 0.68);
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-role__handoff-label {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3vw, 38px) 0 0;
}

.page-about .about-figure .media {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
}

.page-about .about-figure--flow .media {
  aspect-ratio: 4 / 3;
}

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

.page-about .media__caption {
  margin-top: 10px;
  font-size: var(--step-tiny);
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 流程带 ---------- */
.page-about .about-flow-wrap {
  display: grid;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .about-flow {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 16px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-deep), var(--ink-2));
}

.page-about .about-flow li {
  position: relative;
  padding: 0 0 24px 50px;
}

.page-about .about-flow li:last-child {
  padding-bottom: 0;
}

.page-about .about-flow__no {
  position: absolute;
  left: 0;
  top: -2px;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
}

.page-about .about-flow__title {
  margin: 6px 0 6px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.72);
}

/* ---------- 版本沿革 ---------- */
.page-about .about-sec--epoch {
  overflow: hidden;
}

.page-about .about-epoch__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-epoch__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: grayscale(1) contrast(1.1);
}

.page-about .about-epoch__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 12, 13, 0.6), rgba(10, 12, 13, 0.94));
}

.page-about .about-sec--epoch > *:not(.about-epoch__bg) {
  position: relative;
  z-index: 1;
}

.page-about .about-epoch {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-epoch__item {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid rgba(242, 239, 230, 0.16);
}

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

.page-about .about-epoch__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ink-0);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-epoch__item:last-child::before {
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(56, 242, 208, 0.6);
}

.page-about .about-epoch__gen {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .about-epoch__body h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .about-epoch__body p {
  max-width: 40em;
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.74);
}

/* ---------- 规模数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  padding: 18px 16px;
  background: var(--ink-1);
  border: 1px solid var(--ink-2);
  border-top: 2px solid var(--cyan-deep);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .about-stat__num em {
  margin-left: 4px;
  font-style: normal;
  font-size: 0.55em;
  color: var(--stone);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--stone);
}

.page-about .about-bars {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-bars__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
}

.page-about .about-bars__title {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px 12px;
}

.page-about .about-bar__label {
  grid-column: 1;
  font-size: 14px;
  color: rgba(242, 239, 230, 0.8);
}

.page-about .about-bar__value {
  grid-column: 2;
  font-family: var(--font-num);
  font-size: 13px;
  text-align: right;
  color: var(--cyan);
}

.page-about .about-bar__track {
  grid-column: 1 / -1;
  display: block;
  height: 8px;
  background: var(--ink-2);
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan));
}

.page-about .about-bar__fill--70 {
  width: 70%;
}

.page-about .about-bar__fill--30 {
  width: 30%;
}

.page-about .about-note {
  max-width: 40em;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 239, 230, 0.66);
}

/* ---------- 合作对接 ---------- */
.page-about .about-reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
}

.page-about .about-reach li {
  padding: 16px 16px 18px;
  background: rgba(20, 24, 27, 0.72);
  border-left: 2px solid var(--clay);
}

.page-about .about-reach h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.page-about .about-reach p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.72);
}

.page-about .about-reach__acts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
}

.page-about .about-reach__link {
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(56, 242, 208, 0.35);
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .about-reach__link:hover,
.page-about .about-reach__link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
    align-items: end;
  }

  .page-about .about-flow-wrap {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: 84px minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 44px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 112px;
    align-self: start;
    padding-top: 6px;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-role:hover {
    transform: translate(-3px, -3px);
    box-shadow: 9px 9px 0 rgba(56, 242, 208, 0.22), 16px 16px 0 rgba(242, 239, 230, 0.06);
  }

  .page-about .about-role:hover .about-role__handoff {
    color: rgba(10, 12, 13, 0.92);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role__handoff,
  .page-about .about-rail__no,
  .page-about .about-rail__tx,
  .page-about .about-reach__link {
    transition: none;
  }

  .page-about .about-role:hover {
    transform: none;
  }
}
<<<END>>>