.page-about {
  --ab-rail: 176px;
  --ab-pad: 30px;
  display: block;
  background: var(--ink);
  color: var(--white);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-breadcrumb {
  padding-top: clamp(14px, 2.4vw, 22px);
  padding-bottom: clamp(12px, 2vw, 18px);
  font-size: 12.5px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  background: var(--ink-deep);
  padding: clamp(24px, 4.4vw, 56px) 0 clamp(56px, 8vw, 100px);
  overflow: hidden;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: .35;
  pointer-events: none;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -2%;
  right: -2%;
  bottom: -1px;
  height: clamp(40px, 6vw, 70px);
  background: var(--ink);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .ab-hero__kicker {
  color: var(--lime);
  margin: 0 0 14px;
}

.page-about .ab-hero__title {
  font-family: var(--f-display);
  font-size: clamp(28px, 6vw, 56px);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: -.012em;
  margin: 0 0 16px;
  color: var(--white);
  max-width: 16em;
}

.page-about .ab-hero__lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: #C6D8D1;
  max-width: 62ch;
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-hero__panel {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(3, 21, 15, .62);
  padding: clamp(16px, 2.2vw, 24px);
  backdrop-filter: blur(2px);
}
.page-about .ab-hero__ptitle {
  color: var(--muted);
  margin: 0 0 12px;
}

.page-about .ab-hero__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid-line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.page-about .ab-hero__list li {
  background: var(--ink-deep);
  padding: clamp(13px, 1.8vw, 18px) clamp(12px, 1.6vw, 16px);
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.page-about .ab-hstat__num {
  font-family: var(--f-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}
.page-about .ab-hstat__num sup {
  font-size: .46em;
  top: -.75em;
  color: var(--lime);
  margin-left: 2px;
}
.page-about .ab-hstat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 主体双栏 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 46px);
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

/* ---------- 左栏索引 ---------- */
.page-about .ab-rail__title {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}
.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .ab-rail__list::-webkit-scrollbar {
  display: none;
}
.page-about .ab-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  color: var(--white);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease);
}
.page-about .ab-rail__link:hover {
  border-color: var(--lime);
  color: var(--lime);
}
.page-about .ab-rail__link:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
.page-about .ab-rail__no {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--lime);
  letter-spacing: .06em;
}

/* ---------- 章节时间轴 ---------- */
.page-about .ab-sec {
  position: relative;
  padding-left: var(--ab-pad);
  padding-bottom: clamp(38px, 5.6vw, 68px);
}
.page-about .ab-sec:last-of-type {
  padding-bottom: clamp(24px, 3.6vw, 44px);
}
.page-about .ab-sec::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 16px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0, var(--grid-line) 22%, var(--grid-line) 100%);
}
.page-about .ab-sec:last-of-type::before {
  display: none;
}
.page-about .ab-sec::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--lime);
  box-shadow: 0 0 0 3px var(--ink);
  transition: background-color .2s var(--ease);
}
.page-about .ab-sec:hover::after {
  background: var(--blue);
}

.page-about .ab-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  margin-bottom: 14px;
}
.page-about .ab-sec__no {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--lime);
  border: 1px solid rgba(228, 255, 76, .32);
  border-radius: var(--r-pill);
  padding: 3px 9px;
  flex: none;
}
.page-about .ab-sec__title {
  font-family: var(--f-display);
  font-size: clamp(20px, 2.8vw, 30px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: .005em;
  margin: 0;
  color: var(--white);
}

.page-about .ab-sec__body > .prose + .prose,
.page-about .ab-sec__body > .prose + .ab-bars,
.page-about .ab-sec__body > .prose + .ab-facts {
  margin-top: 16px;
}
.page-about .ab-sec__body .prose p {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.8;
  color: #C6D8D1;
}
.page-about .ab-sec__body .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 关键节点表 ---------- */
.page-about .ab-facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid-line);
  border: 1px solid var(--grid-line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.page-about .ab-facts li {
  background: var(--ink-deep);
  padding: 13px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.page-about .ab-facts__k {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}
.page-about .ab-facts__v {
  font-family: var(--f-mono);
  font-size: 15px;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: clamp(18px, 3vw, 28px) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}
.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 数据条组 ---------- */
.page-about .ab-bars {
  display: grid;
  gap: 18px;
  margin-top: 22px;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(3, 21, 15, .5);
}
.page-about .ab-bar__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 9px;
}
.page-about .ab-bar__label {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--white);
}
.page-about .ab-bar__val {
  font-family: var(--f-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  flex: none;
}
.page-about .ab-bar__track {
  height: 7px;
  border-radius: var(--r-pill);
  background: rgba(28, 58, 49, .9);
  overflow: hidden;
}
.page-about .ab-fill {
  display: block;
  height: 100%;
  width: var(--v, 0%);
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--lime), #B9E12F);
  transition: width .6s var(--ease);
}
.page-about .ab-bar--orange .ab-fill {
  background: linear-gradient(90deg, var(--orange), #C95A1B);
}
.page-about .ab-bar--orange .ab-bar__val {
  color: var(--orange);
}
.page-about .ab-bar--blue .ab-fill {
  background: linear-gradient(90deg, var(--blue), #1D8FC0);
}
.page-about .ab-bar--blue .ab-bar__val {
  color: var(--blue);
}
.page-about .ab-bars__note {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 尾段入口 ---------- */
.page-about .ab-next {
  position: relative;
  padding-left: var(--ab-pad);
  border-top: 1px solid var(--line);
  padding-top: clamp(24px, 3.4vw, 38px);
}
.page-about .ab-next__title {
  font-family: var(--f-display);
  font-size: clamp(19px, 2.5vw, 26px);
  font-weight: 800;
  line-height: 1.3;
  margin: 0 0 10px;
  color: var(--white);
}
.page-about .ab-next__text {
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  font-size: 14.5px;
  line-height: 1.78;
  color: #C6D8D1;
  max-width: 60ch;
}
.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 66px);
  }
  .page-about .ab-body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(32px, 4.4vw, 72px);
  }
  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--cmd-h, 60px) + 28px);
    align-self: start;
  }
  .page-about .ab-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
  }
  .page-about .ab-rail__list li + li {
    margin-top: 2px;
  }
  .page-about .ab-rail__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    border: 0;
    border-left: 2px solid var(--lime);
    border-radius: 0;
    padding: 7px 0 7px 13px;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--muted);
    white-space: normal;
  }
  .page-about .ab-rail__link:hover {
    color: var(--white);
    border-left-color: var(--blue);
  }
  .page-about .ab-sec__body .prose p {
    max-width: 68ch;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr) minmax(0, 220px);
  }
  .page-about .ab-flow {
    grid-column: 2 / 4;
  }
  .page-about .ab-sec__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-fill {
    transition: none;
  }
  .page-about .ab-sec::after,
  .page-about .ab-rail__link {
    transition: none;
  }
}
</final_css>

.page-about {
  --v: 1rem;
}