.page-about {
  --about-maxw: 62ch;
  --about-pad: clamp(32px, 5vw, 72px);
  background: var(--sand);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) 0 56px;
  background:
    repeating-linear-gradient(118deg, rgba(246, 240, 228, 0.04) 0 1px, transparent 1px 7px),
    linear-gradient(158deg, #16212C 0%, #0C1116 58%, #0C1116 100%);
  color: var(--sand);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--gold) 0 64px, rgba(246, 240, 228, 0.12) 64px 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(34px, 6.4vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  color: var(--sand);
  max-width: 11em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--sand-70);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-facts {
  border: 1px solid var(--line-light);
  background: rgba(22, 33, 44, 0.72);
  padding: 22px 20px 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__n {
  font-family: var(--mono);
  font-size: clamp(24px, 3vw, 30px);
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--sand);
}

.page-about .about-fact__k {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sand-45);
}

.page-about .about-facts__note {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-light);
  font-size: 13px;
  line-height: 1.7;
  color: var(--sand-45);
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 72px) 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 5vw, 64px);
  }
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 12px;
  padding-block: var(--about-pad) clamp(48px, 7vw, 96px);
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }
}

/* ---------- 左栏时间轴 ---------- */
.page-about .about-timeline {
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-timeline__node {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--sand);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-timeline__no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold-deep);
}

.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus-visible {
  color: var(--text);
  border-color: var(--line-strong);
}

@media (min-width: 960px) {
  .page-about .about-timeline {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-timeline__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 18px;
    position: relative;
  }

  .page-about .about-timeline__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--line-strong);
  }

  .page-about .about-timeline__node {
    border: 0;
    background: transparent;
    padding: 10px 0;
    position: relative;
    white-space: normal;
  }

  .page-about .about-timeline__node::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--sand);
    border: 1px solid var(--gold);
    transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease);
  }

  .page-about .about-timeline__node:hover,
  .page-about .about-timeline__node:focus-visible {
    background: transparent;
    border-color: transparent;
    color: var(--text);
  }

  .page-about .about-timeline__node:hover::before,
  .page-about .about-timeline__node:focus-visible::before {
    background: var(--signal);
    border-color: var(--signal);
    box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.14);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  padding-block: 32px;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-block:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-block h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: var(--text);
}

.page-about .about-block p {
  max-width: var(--about-maxw);
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-lede {
  font-size: 17px !important;
}

.page-about .about-linkline {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-linkline a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 107, 255, 0.35);
}

.page-about .about-linkline a:hover,
.page-about .about-linkline a:focus-visible {
  border-bottom-color: var(--blue);
}

/* ---------- 四段流程 ---------- */
.page-about .about-flow-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-step__no {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--blue);
  padding-top: 4px;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-step__time {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold-deep);
  border: 1px solid var(--line-strong);
  padding: 2px 8px;
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 可展开细节 ---------- */
.page-about .about-more {
  margin-top: 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  background: var(--sand-2);
  padding: 14px 16px;
}

.page-about .about-more summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  color: var(--gold-deep);
  list-style: none;
  line-height: 1.6;
}

.page-about .about-more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-more summary::before {
  content: "＋";
  display: inline-block;
  width: 1.2em;
  font-family: var(--mono);
  font-weight: 400;
}

.page-about .about-more[open] summary::before {
  content: "－";
}

.page-about .about-more p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 18px 14px;
  background: var(--sand);
  min-width: 0;
}

.page-about .about-stat__n {
  font-family: var(--mono);
  font-size: clamp(24px, 3.6vw, 48px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold-deep);
}

.page-about .about-stat__k {
  font-size: 12px;
  letter-spacing: 0.12em;
  line-height: 1.5;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--sand-2);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 演进时间线 ---------- */
.page-about .about-era {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

.page-about .about-era-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  position: relative;
}

.page-about .about-era-list::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-era-list > li {
  position: relative;
  padding: 0 0 22px;
}

.page-about .about-era-list > li:last-child {
  padding-bottom: 0;
}

.page-about .about-era-list > li::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sand);
  border: 1px solid var(--gold);
}

.page-about .about-era-list > li:last-child::before {
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .about-era__title {
  margin: 0 0 6px;
  font-family: var(--display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-era-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  max-width: var(--about-maxw);
}

@media (min-width: 960px) {
  .page-about .about-era {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
    align-items: start;
  }

  .page-about .about-figure--era {
    margin-top: 4px;
    position: sticky;
    top: calc(var(--header-h) + 48px);
  }
}

/* ---------- 合作网络图 ---------- */
.page-about .about-net {
  margin: 30px 0 0;
  border: 1px solid var(--line);
  background: var(--sand-2);
  padding: 14px 10px 10px;
}

.page-about .about-net svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-net .net-lines line {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-net .net-node {
  transition: opacity 0.2s var(--ease);
}

.page-about .about-net .net-node ellipse {
  fill: var(--sand);
  stroke: var(--gold);
  stroke-width: 1.2;
}

.page-about .about-net .net-node--core circle {
  fill: var(--track);
  stroke: var(--signal);
  stroke-width: 1.4;
}

.page-about .about-net text {
  fill: var(--text);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-anchor: middle;
}

.page-about .about-net .net-node--core text {
  fill: var(--sand);
}

.page-about .about-net:hover .net-node {
  opacity: 0.5;
}

.page-about .about-net .net-node:hover {
  opacity: 1;
}

.page-about .about-net figcaption {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 在意的事 ---------- */
.page-about .about-care {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-care__item {
  border-left: 3px solid var(--gold);
  background: var(--sand-2);
  padding: 18px 18px 20px;
}

.page-about .about-care__title {
  margin: 0 0 10px;
  font-family: var(--display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-care__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  max-width: none;
}

@media (min-width: 720px) {
  .page-about .about-care {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background:
    repeating-linear-gradient(118deg, rgba(246, 240, 228, 0.04) 0 1px, transparent 1px 7px),
    linear-gradient(140deg, #16212C 0%, #0C1116 100%);
  color: var(--sand);
  padding: clamp(40px, 6vw, 72px) 0;
  border-top: 1px solid var(--gold);
}

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

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.15;
  color: var(--sand);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sand-70);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}
<<<END>>>