.page-about {
  --about-rail: 218px;
  --about-border: 2px solid var(--moss);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(40px, 6vw, 90px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-top: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding: clamp(26px, 4.4vw, 60px) 0 clamp(28px, 4.4vw, 52px);
  border-bottom: var(--about-border);
}

.page-about .about-intro .kicker {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-intro__title {
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  font-size: clamp(32px, 7vw, 64px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -.03em;
  max-width: 15ch;
}

.page-about .about-intro__lead {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.65vw, 19px);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--moss);
  border: var(--about-border);
}

@media (min-width: 760px) {
  .page-about .about-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-facts__item {
  background: var(--panel);
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-facts__num {
  font-family: var(--mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal-hi);
  letter-spacing: -.02em;
}

.page-about .about-facts__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--stone);
  letter-spacing: .03em;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
  padding-top: clamp(22px, 3vw, 40px);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(34px, 4vw, 62px);
  }
}

/* ---------- 小节导航 ---------- */
.page-about .about-nav {
  border-bottom: var(--about-border);
  padding-bottom: 4px;
}

.page-about .about-nav__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-nav__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-nav__list::-webkit-scrollbar { display: none; }

.page-about .about-nav__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--stone);
  font-size: 14px;
  line-height: 1.4;
  border-left: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-nav__link:hover,
.page-about .about-nav__link:focus-visible { color: var(--paper); }

.page-about .about-nav__link[data-active] {
  color: var(--signal);
  border-left-color: var(--signal);
  background: rgba(47, 224, 200, .07);
}

.page-about .about-nav__num {
  font-family: var(--mono);
  font-size: 12px;
  opacity: .85;
}

@media (min-width: 1024px) {
  .page-about .about-nav {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
    border-left: var(--about-border);
  }
  .page-about .about-nav__title { padding-left: 14px; }
  .page-about .about-nav__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding: 0;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(28px, 4.2vw, 54px) 0;
  border-top: var(--about-border);
}

.page-about .about-body > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 1.6vw, 20px);
  margin-bottom: clamp(14px, 2vw, 24px);
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--mono);
  font-size: clamp(26px, 4.2vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--signal);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.015em;
}

.page-about .about-sec p {
  max-width: 66ch;
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .about-sec__lead {
  font-size: 17px !important;
  color: var(--paper);
  margin-bottom: clamp(18px, 2.4vw, 28px) !important;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure { margin: 0; }

.page-about .media {
  position: relative;
  overflow: hidden;
  border: 3px solid var(--moss);
  box-shadow: var(--hard);
  background: var(--deep);
}

.page-about .media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(8, 23, 20, .22) 0 1px, transparent 1px 5px);
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.9) contrast(1.05);
}

.page-about .media__caption {
  margin-top: 12px;
  max-width: 48ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 01 段落 + 图 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

@media (min-width: 900px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: clamp(28px, 3.6vw, 46px);
    align-items: start;
  }
}

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

/* ---------- 02 岗位卡 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 20px;
}

@media (min-width: 800px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
  }
  .page-about .about-role:nth-child(2) { margin-top: 20px; }
  .page-about .about-role:nth-child(3) { margin-top: 40px; }
}

.page-about .about-role {
  border: var(--about-border);
  background: var(--panel);
  box-shadow: var(--hard-sm);
  padding: 22px 20px 24px;
  transition: border-color .24s var(--ease), box-shadow .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: var(--signal);
  box-shadow: 8px 8px 0 rgba(47, 224, 200, .18);
  transform: translateY(-4px);
}

.page-about .about-role__name {
  margin: 0 0 14px !important;
  font-family: var(--mono);
  font-size: 13px !important;
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .about-role__count {
  margin: 0 0 12px !important;
  font-family: var(--mono);
  font-size: clamp(34px, 4vw, 44px) !important;
  font-weight: 700;
  line-height: 1;
  color: var(--signal-hi);
  letter-spacing: -.03em;
}

.page-about .about-role__unit {
  display: block;
  margin-top: 8px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .04em;
  color: var(--stone);
}

.page-about .about-role__desc {
  margin: 0 0 14px !important;
  font-size: 15px !important;
  line-height: 1.75 !important;
  color: var(--paper);
}

.page-about .about-role__list {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--moss);
  display: grid;
  gap: 9px;
}

.page-about .about-role__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--stone);
  transition: color .22s var(--ease);
}

.page-about .about-role__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 10px;
  height: 2px;
  background: var(--moss);
  transition: background .22s var(--ease);
}

.page-about .about-role:hover .about-role__list li,
.page-about .about-role:focus-within .about-role__list li { color: var(--paper); }

.page-about .about-role:hover .about-role__list li::before,
.page-about .about-role:focus-within .about-role__list li::before { background: var(--signal); }

/* ---------- 03 流程与时间轴 ---------- */
.page-about .about-flow-wrap {
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: clamp(16px, 2.2vw, 26px);
}

.page-about .about-flow {
  display: block;
  width: 100%;
  min-width: 480px;
  max-width: 720px;
  height: auto;
}

.page-about .about-flow line { stroke: var(--moss); stroke-width: 2; }
.page-about .about-flow circle { fill: var(--deep); stroke: var(--signal); stroke-width: 2; }
.page-about .about-flow text {
  fill: var(--stone);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: var(--moss);
}

.page-about .about-timeline > li { margin-bottom: 18px; }
.page-about .about-timeline > li:last-child { margin-bottom: 0; }

.page-about .about-node {
  position: relative;
  border: var(--about-border);
  background: var(--panel);
  box-shadow: var(--hard-sm);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 21px;
  width: 12px;
  height: 12px;
  background: var(--deep);
  border: 2px solid var(--signal);
  transition: background .2s var(--ease);
}

.page-about .about-node[open]::before { background: var(--signal); }

.page-about .about-node__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 16px 18px;
}

.page-about .about-node__summary::-webkit-details-marker { display: none; }
.page-about .about-node__summary::marker { content: ""; }

.page-about .about-node__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 20px;
  line-height: 1;
  color: var(--signal);
}

.page-about .about-node[open] .about-node__summary::after { content: "–"; }

.page-about .about-node__when {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--signal);
  border: 1px solid var(--moss);
  padding: 3px 8px;
}

.page-about .about-node__name {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-node__body {
  border-top: 1px solid var(--moss);
  padding: 14px 18px 18px;
}

.page-about .about-node__body p {
  margin: 0 0 12px !important;
  font-size: 15.5px !important;
  line-height: 1.8 !important;
  max-width: 60ch;
}

.page-about .about-node__body ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-node__body li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-node__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 10px;
  height: 2px;
  background: var(--signal);
}

.page-about .about-timeline__media { position: relative; }
.page-about .about-timeline__media::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 16px;
  width: 12px;
  height: 12px;
  background: var(--clay);
}

/* ---------- 数字带 ---------- */
.page-about .about-band {
  list-style: none;
  margin: clamp(28px, 4vw, 50px) 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--moss);
  border: var(--about-border);
}

@media (min-width: 760px) {
  .page-about .about-band { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-band__cell {
  background: var(--deep);
  padding: clamp(18px, 2.4vw, 28px);
  display: flex;
  flex-direction: column;
}

.page-about .about-band__num {
  font-family: var(--mono);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about .about-band__unit {
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-about .about-band__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--stone);
}

/* ---------- 04 版本 ---------- */
.page-about .about-versions { margin-top: clamp(20px, 2.8vw, 32px); }

.page-about .about-versions__list {
  list-style: none;
  margin: clamp(16px, 2.2vw, 26px) 0;
  padding: 0;
  border-top: 1px solid var(--moss);
}

.page-about .about-versions__list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--moss);
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--paper);
}

@media (min-width: 640px) {
  .page-about .about-versions__list li {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
    padding: 16px 0;
  }
}

.page-about .about-versions__k {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--signal);
}

/* ---------- 06 备案表 ---------- */
.page-about .about-registry {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  border: var(--about-border);
  background: var(--panel);
}

.page-about .about-registry__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--moss);
}

.page-about .about-registry__row:last-child { border-bottom: 0; }

@media (min-width: 640px) {
  .page-about .about-registry__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

.page-about .about-registry dt {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--stone);
}

.page-about .about-registry dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .about-registry dd.about-registry__mono {
  font-family: var(--mono);
  letter-spacing: .02em;
  color: var(--signal-hi);
  word-break: break-all;
}

/* ---------- 按钮行 ---------- */
.page-about .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

/* ---------- 无脚本与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-nav__link,
  .page-about .about-role,
  .page-about .about-role__list li,
  .page-about .about-role__list li::before,
  .page-about .about-node::before {
    transition: none !important;
    transform: none !important;
  }
}
<<<END>>>