.page-about {
  background-color: var(--paper);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-block: clamp(1rem, 2.4vw, 1.6rem) 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--rock);
}

.page-about .ab-crumb a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .ab-crumb a:hover {
  color: var(--goji);
  border-bottom-color: var(--goji);
}

.page-about .ab-crumb span[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  margin-top: clamp(1rem, 2.4vw, 1.6rem);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px;
  background-position: -1px -1px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding-block: clamp(2rem, 5vw, 3.75rem) clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .ab-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .22em;
  color: var(--loess);
}

.page-about .ab-hero__eyebrow::before {
  content: "";
  width: 2.2rem;
  height: 1px;
  background: var(--loess);
  flex: 0 0 auto;
}

.page-about .ab-hero__title {
  margin: 0;
  font-size: clamp(2rem, 6.2vw, 4rem);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .ab-hero__lede {
  margin: clamp(1rem, 2vw, 1.4rem) 0 0;
  max-width: 48ch;
  font-size: clamp(1rem, 1.1vw, 1.08rem);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.3rem, 3vw, 1.9rem);
}

.page-about .ab-hero__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--sand);
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-stat {
  padding: .85rem .5rem .85rem .1rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-stat dt {
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--rock);
}

.page-about .ab-stat dd {
  margin: .3rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--loess);
}

.page-about .ab-unit {
  font-family: var(--font-sans);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--rock);
}

/* ---------- 主体两栏 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2rem);
  padding-block: clamp(1.75rem, 4vw, 3rem) clamp(2.5rem, 5vw, 4rem);
}

.page-about .ab-index__label {
  margin: 0 0 .55rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--rock);
}

.page-about .ab-toc {
  display: grid;
  gap: 0;
}

.page-about .ab-toc__link {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  padding: .5rem .6rem;
  border-left: 2px solid transparent;
  border-bottom: 1px solid var(--line-soft);
  font-size: .9rem;
  color: var(--ink);
  text-decoration: none;
  transition: color var(--dur) ease, background-color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .ab-toc__link:hover,
.page-about .ab-toc__link[aria-current="true"] {
  color: var(--goji);
  border-left-color: var(--goji);
  background: var(--sand);
  font-weight: 700;
}

.page-about .ab-toc__num {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--loess);
}

.page-about .ab-toc__link[aria-current="true"] .ab-toc__num {
  color: var(--goji);
}

.page-about .ab-index__quick {
  display: inline-block;
  margin-top: 1rem;
  padding-bottom: 2px;
  font-size: .84rem;
  color: var(--goji);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color var(--dur) ease;
}

.page-about .ab-index__quick:hover {
  color: var(--signal);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding-block: clamp(1.6rem, 3.5vw, 2.5rem);
  border-top: 1px solid var(--line-strong);
  scroll-margin-top: 6rem;
}

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

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  margin-bottom: clamp(1rem, 2vw, 1.35rem);
}

.page-about .ab-sec__num {
  flex: 0 0 auto;
  padding: .16rem .42rem;
  background: var(--loess);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .1em;
}

.page-about .ab-sec__title {
  margin: 0;
  font-size: clamp(1.3rem, 2.8vw, 1.9rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.01em;
}

.page-about .ab-prose p {
  margin: 0 0 1rem;
  max-width: 72ch;
  font-size: 1rem;
  line-height: 1.85;
}

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

.page-about .ab-note {
  margin: 1.2rem 0 0;
  padding: .9rem 1rem;
  border-left: 3px solid var(--loess);
  background: var(--sand);
  font-size: .93rem;
  line-height: 1.8;
}

.page-about .ab-note strong {
  color: var(--goji);
}

/* ---------- 时间线 ---------- */
.page-about .ab-time {
  position: relative;
  display: grid;
  gap: 1.3rem;
  margin: 1.2rem 0 0;
  padding: 0 0 0 1.6rem;
  list-style: none;
}

.page-about .ab-time::before {
  content: "";
  position: absolute;
  left: .28rem;
  top: .5rem;
  bottom: .5rem;
  width: 1px;
  background: var(--line-strong);
}

.page-about .ab-time__item {
  position: relative;
  padding: .8rem 1rem;
  border: 1px solid var(--line-soft);
  background: var(--white);
  transition: background-color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .ab-time__item:hover,
.page-about .ab-time__item:focus-within {
  background: var(--sand);
  border-color: var(--loess);
}

.page-about .ab-time__item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: 1.2rem;
  width: .62rem;
  height: .62rem;
  border: 1px solid var(--goji);
  border-radius: 50%;
  background: var(--paper);
}

.page-about .ab-time__year {
  display: inline-block;
  padding: .08rem .42rem;
  background: var(--deep);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .1em;
}

.page-about .ab-time__title {
  margin: .55rem 0 .35rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-time__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--rock);
}

/* ---------- 区域覆盖 ---------- */
.page-about .ab-figure {
  margin: 1.3rem 0 0;
  border: 1px solid var(--line);
  background: var(--white);
}

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

.page-about .ab-figure figcaption {
  padding: .5rem .7rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--rock);
}

.page-about .ab-areas {
  margin: 1.3rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-area {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: .7rem;
  padding: .62rem .2rem;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color var(--dur) ease;
}

.page-about .ab-area:hover {
  background: var(--sand);
}

.page-about .ab-area__code {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--loess);
}

.page-about .ab-area__name {
  font-size: .95rem;
  font-weight: 600;
}

.page-about .ab-area__city {
  padding: .05rem .34rem;
  border: 1px solid var(--lake);
  color: var(--lake);
  font-family: var(--font-mono);
  font-size: .7rem;
  white-space: nowrap;
}

/* ---------- 团队与核验 ---------- */
.page-about .ab-team-bars {
  display: grid;
  gap: .85rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: .35rem .7rem;
}

.page-about .ab-bar__name {
  font-size: .92rem;
}

.page-about .ab-bar__val {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 700;
  color: var(--loess);
}

.page-about .ab-bar__track {
  grid-column: 1 / -1;
  height: 6px;
  border: 1px solid var(--line-soft);
  background: var(--sand);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  background: var(--lake);
}

.page-about .ab-bar--1 .ab-bar__fill { width: 33.3%; }
.page-about .ab-bar--2 .ab-bar__fill { width: 27.8%; }
.page-about .ab-bar--3 .ab-bar__fill { width: 22.2%; }
.page-about .ab-bar--4 .ab-bar__fill { width: 16.7%; }

.page-about .ab-checks {
  display: grid;
  gap: .75rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-check {
  padding: .85rem .95rem;
  border: 1px solid var(--line);
  border-top: 2px solid var(--goji);
  background: var(--white);
}

.page-about .ab-check__k {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--goji);
}

.page-about .ab-check__t {
  margin: .3rem 0 .3rem;
  font-size: .98rem;
  font-weight: 700;
}

.page-about .ab-check__d {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .ab-steps {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: abstep;
}

.page-about .ab-step {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .3rem .6rem;
  border: 1px solid var(--line);
  background: var(--white);
  font-size: .84rem;
}

.page-about .ab-step::before {
  counter-increment: abstep;
  content: counter(abstep, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  color: var(--lake);
}

/* ---------- 收束区 ---------- */
.page-about .ab-outro {
  display: grid;
  gap: 1.4rem;
  margin-top: clamp(2rem, 4vw, 2.8rem);
  padding: clamp(1.5rem, 4vw, 2.6rem);
  background: var(--deep);
  color: var(--white);
}

.page-about .ab-outro__title {
  margin: 0;
  font-size: clamp(1.2rem, 2.6vw, 1.65rem);
  font-weight: 900;
  line-height: 1.28;
  color: var(--white);
}

.page-about .ab-outro__text {
  margin: .6rem 0 0;
  max-width: 56ch;
  font-size: .93rem;
  line-height: 1.85;
  color: rgba(251, 248, 240, .82);
}

.page-about .ab-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  align-content: start;
}

.page-about .ab-outro__link {
  display: inline-flex;
  align-items: center;
  padding: .55rem .9rem;
  border: 1px solid rgba(251, 248, 240, .35);
  color: var(--white);
  font-size: .86rem;
  text-decoration: none;
  transition: background-color var(--dur) ease, border-color var(--dur) ease;
}

.page-about .ab-outro__link:hover {
  background: var(--goji);
  border-color: var(--goji);
}

/* ---------- 响应式 ---------- */
@media (max-width: 959px) {
  .page-about .ab-toc {
    display: flex;
    gap: .45rem;
    overflow-x: auto;
    padding-bottom: .4rem;
    scrollbar-width: thin;
  }

  .page-about .ab-toc__link {
    flex: 0 0 auto;
    border: 1px solid var(--line);
    border-left: 1px solid var(--line);
    padding: .4rem .7rem;
    white-space: nowrap;
  }

  .page-about .ab-toc__link[aria-current="true"] {
    border-color: var(--goji);
  }
}

@media (min-width: 600px) {
  .page-about .ab-hero {
    background-size: 72px 72px, 72px 72px;
  }

  .page-about .ab-stat {
    padding-inline: .9rem;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .ab-stat:nth-child(2n) {
    border-right: 0;
  }
}

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

  .page-about .ab-stat {
    padding: .95rem .9rem;
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .ab-stat:first-child {
    padding-left: 0;
  }

  .page-about .ab-stat:last-child {
    border-right: 0;
  }

  .page-about .ab-checks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-outro {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: end;
  }
}

@media (min-width: 960px) {
  .page-about .ab-layout {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 5.5rem;
  }
}
<<<END>>>