.page-about {
  --ab-gap: clamp(20px, 3vw, 40px);
  background: var(--ink);
  color: var(--bone);
  font-family: var(--sans);
  line-height: 1.8;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding: var(--s3) 0 0;
}

/* ---------- 通用文字积木 ---------- */
.page-about .ab-kicker {
  margin: 0 0 var(--s2);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .ab-index {
  margin: 0 0 var(--s2);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
  opacity: 0.72;
}

.page-about .ab-h2 {
  margin: 0 0 var(--s3);
  max-width: 18em;
  font-size: clamp(1.55rem, 4.2vw, 2.75rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 800;
}

.page-about .ab-lede {
  margin: 0;
  max-width: 34em;
  font-family: var(--serif);
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.9;
  color: var(--gray);
}

.page-about .ab-prose {
  margin: 0 0 var(--s3);
  max-width: 34em;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--bone);
}

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

.page-about .ab-inline-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  border-bottom-color: var(--lime);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  margin-top: var(--s4);
  padding: clamp(36px, 6vw, 80px) 0 clamp(36px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -12%;
  right: -6%;
  width: min(760px, 62%);
  height: 124%;
  background: linear-gradient(158deg, rgba(20, 49, 43, 0.95), rgba(14, 36, 32, 0.06) 78%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 27%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(200, 255, 61, 0.22), transparent);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  margin: 0;
  max-width: 12em;
  font-size: clamp(2.3rem, 8.5vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 900;
}

.page-about .ab-hero__lede {
  margin: var(--s3) 0 0;
  max-width: 34em;
  font-family: var(--serif);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.9;
  color: var(--gray);
}

.page-about .ab-figures {
  list-style: none;
  margin: var(--s5) 0 0;
  padding: var(--s3) 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s3);
}

.page-about .ab-figure {
  min-width: 0;
}

.page-about .ab-figure__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.3rem, 4.2vw, 2.4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .ab-figure__label {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--gray);
}

/* ---------- 区块骨架 ---------- */
.page-about .ab-sec {
  padding: clamp(52px, 8vw, 104px) 0;
  border-bottom: 1px solid var(--line);
}

/* ---------- 01 我们做什么 ---------- */
.page-about .ab-lines {
  list-style: none;
  margin: var(--s5) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-line {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: var(--s2);
  padding: var(--s3) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-line__no {
  grid-column: 1;
  grid-row: 1;
  padding-top: 0.35em;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--gray);
}

.page-about .ab-line__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .ab-line__text {
  grid-column: 2;
  grid-row: 2;
  margin: var(--s1) 0 0;
  max-width: 34em;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .ab-line__text a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
}

.page-about .ab-line__text a:hover,
.page-about .ab-line__text a:focus-visible {
  border-bottom-color: var(--lime);
}

/* ---------- 02 时间线 ---------- */
.page-about .ab-tracknav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1);
  margin: 0 0 var(--s5);
}

.page-about .ab-tracknav a {
  padding: 0.3rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--gray);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-tracknav a:hover,
.page-about .ab-tracknav a:focus-visible {
  color: var(--lime);
  border-color: rgba(200, 255, 61, 0.55);
  outline: none;
}

.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--s3);
  border-left: 1px solid var(--line-2);
}

.page-about .ab-node {
  position: relative;
  padding-bottom: var(--s5);
  scroll-margin-top: 150px;
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  top: 0.5em;
  left: calc(-1 * var(--s3) - 4px);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line-2);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-node:target::before {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.16);
}

.page-about .ab-node__year {
  display: block;
  margin-bottom: var(--s2);
  font-family: var(--mono);
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--bone);
  transition: color 0.2s ease;
}

.page-about .ab-node:target .ab-node__year {
  color: var(--lime);
}

.page-about .ab-node__title {
  margin: 0 0 var(--s1);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .ab-node__text {
  margin: 0;
  max-width: 34em;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .ab-shot {
  margin: var(--s5) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
}

.page-about .ab-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-shot figcaption {
  padding: var(--s2) var(--s3);
  font-size: 0.8rem;
  color: var(--gray);
  border-top: 1px solid var(--line);
}

/* ---------- 03 团队 ---------- */
.page-about .ab-team__top {
  display: grid;
  gap: var(--s5);
}

.page-about .ab-team__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06) brightness(0.92);
}

.page-about .ab-team .ki-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1);
  margin-top: var(--s4);
}

.page-about .ab-roster {
  list-style: none;
  margin: var(--s5) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-roster__item {
  min-width: 0;
  padding: var(--s3) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-roster__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s2);
  margin: 0 0 var(--s1);
}

.page-about .ab-roster__group {
  padding: 0.1rem 0.45rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--bone);
  border: 1px solid var(--violet);
  border-radius: var(--radius);
}

.page-about .ab-roster__title {
  margin: 0 0 var(--s1);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .ab-roster__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 04 服务范围 ---------- */
.page-about .ab-metrics {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s5);
  margin-top: var(--s5);
}

.page-about .ab-metric {
  min-width: 0;
  padding-top: var(--s3);
  border-top: 1px solid var(--line);
  text-align: center;
}

.page-about .ab-metric__num {
  display: inline-block;
  padding-bottom: 8px;
  font-family: var(--mono);
  font-size: clamp(2.1rem, 6.6vw, 3.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--bone);
  border-bottom: 1px solid var(--lime);
}

.page-about .ab-metric__label {
  display: block;
  margin-top: var(--s2);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .ab-metric__text {
  margin: var(--s2) auto 0;
  max-width: 22em;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 05 内容与合作 ---------- */
.page-about .ab-principles__grid {
  display: grid;
  gap: var(--s5);
}

.page-about .ab-coop {
  padding: var(--s4);
  background: var(--layer);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about .ab-coop__title {
  margin: 0 0 var(--s2);
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .ab-coop__list {
  list-style: none;
  margin: 0 0 var(--s3);
  padding: 0;
}

.page-about .ab-coop__list li {
  padding: var(--s2) 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--gray);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-coop__list li:last-child {
  border-bottom: 0;
}

.page-about .ab-coop__list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 0.98rem;
  color: var(--bone);
}

.page-about .ab-coop__note {
  margin: 0 0 var(--s3);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 页尾节点 ---------- */
.page-about .ab-endnode {
  padding: clamp(48px, 7vw, 96px) 0 0;
}

.page-about .ab-endnode__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .ab-endnode__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.78) contrast(1.06);
}

.page-about .ab-endnode__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(91, 75, 138, 0.34), rgba(7, 12, 11, 0.65) 72%);
  pointer-events: none;
}

.page-about .ab-endnode__body {
  max-width: 40em;
  padding: var(--s4) 0 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 820px) {
  .page-about .ab-line {
    grid-template-columns: 4.5rem minmax(0, 15em) minmax(0, 1fr);
    gap: var(--s4);
    padding: var(--s4) 0;
    align-items: start;
  }

  .page-about .ab-line__no {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .ab-line__title {
    grid-column: 2;
    grid-row: 1;
    font-size: 1.15rem;
  }

  .page-about .ab-line__text {
    grid-column: 3;
    grid-row: 1;
    margin: 0;
  }
}

@media (min-width: 760px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--s4);
  }
}

@media (min-width: 900px) {
  .page-about .ab-team__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: var(--s6);
    align-items: start;
  }

  .page-about .ab-roster {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--s5);
  }
}

@media (min-width: 920px) {
  .page-about .ab-principles__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.75fr);
    gap: var(--s6);
    align-items: start;
  }
}

@media (max-width: 560px) {
  .page-about .ab-hero::before {
    width: 82%;
    right: -14%;
  }

  .page-about .ab-figures {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--s2);
  }

  .page-about .ab-figure__num {
    font-size: 1.5rem;
  }

  .page-about .ab-endnode__media img {
    aspect-ratio: 16 / 10;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tracknav a,
  .page-about .ab-node::before,
  .page-about .ab-node__year {
    transition: none;
  }
}
<<<END>>>