.page-about {
  --about-rail-w: 188px;
  --about-flow-gap: clamp(64px, 9vw, 116px);
  --about-ink-soft: rgba(11, 31, 26, .58);
  --about-ink-body: rgba(11, 31, 26, .84);
  --about-ink-rule: rgba(11, 31, 26, .22);
  background: var(--ink);
  color: var(--silver);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-top {
  padding-top: clamp(20px, 3vw, 32px);
}
.page-about .about-crumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.page-about .about-crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--lime);
}
.page-about .about-crumbs [aria-current="page"] {
  color: var(--silver);
}
.page-about .about-crumbs__sep {
  color: rgba(185, 196, 192, .38);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(32px, 5vw, 56px) 0 clamp(40px, 6vw, 72px);
  border-bottom: 2px solid var(--line-strong);
  isolation: isolate;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(185, 196, 192, .09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(185, 196, 192, .09) 1px, transparent 1px);
  background-size: 8px 8px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, .25) 62%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, .25) 62%, transparent 100%);
  pointer-events: none;
}
.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--amber);
}
.page-about .about-hero__title {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.6vw, 60px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--paper);
  max-width: 20ch;
}
.page-about .about-hero__lede {
  margin: 24px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.78;
  color: var(--silver);
  max-width: 62ch;
}
.page-about .about-hero__stats {
  margin-top: clamp(32px, 4vw, 46px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line-strong);
}
.page-about .about-hero__stat {
  background: var(--ink);
  padding: 18px 16px;
}
.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1.08;
  color: var(--lime);
}
.page-about .about-hero__stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 轨道 + 内容流 ---------- */
.page-about .about-rail {
  padding-top: clamp(36px, 5vw, 60px);
  padding-bottom: clamp(56px, 8vw, 96px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}
.page-about .about-track {
  border-top: 2px solid var(--line-strong);
  padding-top: 14px;
  min-width: 0;
}
.page-about .about-track__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .about-track__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.page-about .about-track__item {
  flex: 0 0 auto;
}
.page-about .about-track__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid var(--line-strong);
  background: var(--card);
  color: var(--silver);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-track__link:hover,
.page-about .about-track__link:focus-visible {
  border-color: var(--lime);
  color: var(--paper);
  transform: translateY(-2px);
}
.page-about .about-track__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}
.page-about .about-track__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--lime);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--about-flow-gap);
  min-width: 0;
}

/* ---------- 章节头 ---------- */
.page-about .about-section {
  min-width: 0;
  scroll-margin-top: 108px;
}
.page-about .about-section__head {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 20px;
  border-top: 2px solid var(--line-strong);
  margin-bottom: 20px;
}
.page-about .about-section__no {
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--line-strong);
  background: var(--card);
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--lime);
}
.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3vw, 29px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-section__lede {
  margin: 0 0 26px;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.76;
  color: var(--lime);
  max-width: 52ch;
}

/* ---------- 正文 ---------- */
.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--silver);
  max-width: 70ch;
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-prose--tight p {
  margin-top: 26px;
  font-size: 15px;
  color: var(--mist);
}

/* ---------- 坐标索引 ---------- */
.page-about .about-coord {
  margin-top: 30px;
  border: 2px solid var(--line-strong);
  background: var(--card);
  box-shadow: var(--shadow-hard);
}
.page-about .about-coord__row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-coord__row:last-child {
  border-bottom: 0;
}
.page-about .about-coord__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--lime);
  text-transform: uppercase;
}
.page-about .about-coord__val {
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver);
}
.page-about .about-coord__val strong {
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  position: relative;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--line-strong);
}
.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 46px;
  outline: none;
}
.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}
.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: 4px;
  width: 24px;
  height: 24px;
  border: 2px solid var(--line-strong);
  background: var(--ink);
  display: grid;
  place-items: center;
  transition: border-color var(--dur) var(--ease);
}
.page-about .about-timeline__marker::after {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--mist);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-timeline__item:hover .about-timeline__marker,
.page-about .about-timeline__item:focus-visible .about-timeline__marker {
  border-color: var(--lime);
}
.page-about .about-timeline__item:hover .about-timeline__marker::after,
.page-about .about-timeline__item:focus-visible .about-timeline__marker::after {
  background: var(--lime);
  transform: scale(1.35);
}
.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  border: 1px solid rgba(255, 194, 75, .45);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber);
}
.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.4;
  color: var(--paper);
}
.page-about .about-timeline__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--silver);
  max-width: 66ch;
}
.page-about .about-timeline__more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur) var(--ease);
}
.page-about .about-timeline__more > div {
  overflow: hidden;
  min-height: 0;
}
.page-about .about-timeline__more p {
  margin: 0;
  padding: 12px 0 0 14px;
  border-left: 2px solid var(--lime);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 60ch;
}
.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  grid-template-rows: 1fr;
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--line-strong);
  background: var(--card);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  min-width: 0;
}
.page-about .about-figure--hero {
  margin-top: 30px;
}
.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure__caption {
  margin: 0;
  padding: 11px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .about-figure--banner {
  border-left: 0;
  border-right: 0;
  border-bottom: 0;
  box-shadow: none;
  opacity: .34;
}

/* ---------- 纸白反转区 ---------- */
.page-about .about-pull {
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--ink-deep);
  box-shadow: var(--shadow-hard);
  padding: clamp(22px, 4vw, 38px);
  margin-top: 26px;
}
.page-about .about-pull__kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--about-ink-soft);
}
.page-about .about-users {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 22px;
}
.page-about .about-user {
  border-top: 2px solid var(--about-ink-rule);
  padding-top: 14px;
  min-width: 0;
}
.page-about .about-user__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--about-ink-soft);
}
.page-about .about-user__title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.38;
  color: var(--ink);
}
.page-about .about-user__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-body);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 5vw, 52px);
  padding-top: 26px;
  border-top: 2px solid var(--line-strong);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

/* ---------- 运营主体信息 ---------- */
.page-about .about-base__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line-strong);
  margin-top: 8px;
}
.page-about .about-base__cell {
  background: var(--card);
  padding: 18px 16px;
  min-width: 0;
}
.page-about .about-base__key {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .about-base__val {
  display: block;
  font-size: 15px;
  line-height: 1.65;
  color: var(--paper);
  overflow-wrap: anywhere;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-base__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-users {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (min-width: 780px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 42px;
  }
  .page-about .about-base__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-users {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-rail {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 78px);
  }
  .page-about .about-track {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: 0;
    padding-top: 0;
  }
  .page-about .about-track__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 2px solid var(--line-strong);
  }
  .page-about .about-track__item {
    flex: none;
  }
  .page-about .about-track__link {
    width: 100%;
    border: 0;
    background: transparent;
    padding: 12px 6px 12px 20px;
    white-space: normal;
    position: relative;
    transform: none;
  }
  .page-about .about-track__link::before {
    content: "";
    position: absolute;
    left: -8px;
    top: 50%;
    width: 10px;
    height: 10px;
    margin-top: -5px;
    background: var(--ink);
    border: 2px solid var(--line-strong);
    transform: rotate(45deg);
    transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }
  .page-about .about-track__link:hover,
  .page-about .about-track__link:focus-visible {
    transform: none;
  }
  .page-about .about-track__link:hover::before,
  .page-about .about-track__link:focus-visible::before {
    background: var(--lime);
    border-color: var(--lime);
  }
  .page-about .about-section__no {
    width: 52px;
    height: 52px;
    font-size: 17px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__link,
  .page-about .about-timeline__marker,
  .page-about .about-timeline__marker::after,
  .page-about .about-timeline__more {
    transition: none;
  }
}
<<<END>>>