.page-about {
  --ab-side: 200px;
  --ab-gap: clamp(20px, 3vw, 44px);
  background: var(--bg);
  color: var(--fg);
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(20px, 4vw, 44px) var(--gutter) clamp(56px, 8vw, 96px);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about h1 {
  margin: 14px 0 18px;
  font-size: clamp(2rem, 6.2vw, 4.1rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about h2 {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 3.2vw, 2.1rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--paper);
}

.page-about h3 {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  gap: 26px;
  align-items: start;
  padding-bottom: clamp(28px, 5vw, 52px);
  border-bottom: 1px solid var(--line);
}

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

.page-about .ab-lede {
  max-width: 36em;
  margin: 0;
  font-size: clamp(0.95rem, 1.6vw, 1.06rem);
  line-height: 1.8;
  color: rgba(232, 228, 216, 0.86);
}

.page-about .ab-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 24px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-hero-stats > div {
  min-width: 96px;
}

.page-about .ab-hero-stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .ab-hero-stats dd {
  margin: 5px 0 0;
  font-size: 14px;
  color: rgba(232, 228, 216, 0.78);
}

.page-about .ab-hero-stats .mono {
  font-size: 19px;
  color: var(--lime);
  letter-spacing: 0.04em;
}

/* ---------- 图片框 ---------- */
.page-about .ab-fig {
  margin: 0;
  padding: 8px;
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.3);
}

.page-about .ab-fig img {
  width: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.03);
}

.page-about .ab-fig figcaption {
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--steel);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  display: grid;
  gap: 18px;
  padding: clamp(30px, 5vw, 54px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-sec-side {
  padding-left: 14px;
  border-left: 2px solid var(--line-red);
}

.page-about .ab-sec-side .index {
  color: var(--red);
}

.page-about .ab-note {
  margin: 10px 0 0;
  max-width: 28em;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

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

.page-about .ab-sec-body > p {
  max-width: 38em;
  margin: 0 0 14px;
  line-height: 1.8;
  color: rgba(232, 228, 216, 0.82);
}

/* ---------- 清单 ---------- */
.page-about .ab-checklist {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-checklist li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(232, 228, 216, 0.8);
}

.page-about .ab-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--red);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .ab-stage {
  position: relative;
  padding: 0 0 clamp(24px, 4vw, 36px) 30px;
}

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

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--red);
}

.page-about .ab-stage:nth-child(5)::before {
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 5px var(--lime);
}

.page-about .ab-stage-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .ab-stage-ver {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lime);
  background: var(--ink-700);
  border: 1px solid var(--line-strong);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.32);
}

.page-about .ab-stage-era {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .ab-stage-title {
  margin: 0 0 8px;
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.01em;
}

.page-about .ab-stage:nth-child(1) .ab-stage-title { font-size: 1.03rem; }
.page-about .ab-stage:nth-child(2) .ab-stage-title { font-size: 1.1rem; }
.page-about .ab-stage:nth-child(3) .ab-stage-title { font-size: 1.18rem; }
.page-about .ab-stage:nth-child(4) .ab-stage-title { font-size: 1.28rem; }
.page-about .ab-stage:nth-child(5) .ab-stage-title { font-size: 1.42rem; }

.page-about .ab-stage p {
  max-width: 37em;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(232, 228, 216, 0.78);
}

.page-about .ab-more {
  margin-top: 12px;
  padding-top: 8px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .ab-more summary {
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

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

.page-about .ab-more summary::before {
  content: "+ ";
  color: var(--red);
}

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

.page-about .ab-more ul {
  margin: 8px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

.page-about .ab-more li {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(232, 228, 216, 0.72);
}

/* ---------- 团队 ---------- */
.page-about .ab-bar {
  display: block;
  width: 100%;
  height: auto;
  margin: 18px 0 22px;
}

.page-about .ab-seg {
  transition: opacity var(--dur) var(--ease);
}

.page-about .ab-seg--a { fill: var(--red); }
.page-about .ab-seg--b { fill: var(--lime); }
.page-about .ab-seg--c { fill: var(--blue); }
.page-about .ab-seg--d { fill: var(--steel); }

.page-about .ab-bar:hover .ab-seg { opacity: 0.5; }
.page-about .ab-bar .ab-seg:hover { opacity: 1; }

.page-about .ab-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-team {
  padding: 14px 14px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line-strong);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-team:hover,
.page-about .ab-team:focus-within {
  border-color: var(--line-red);
  transform: translateY(-2px);
}

.page-about .ab-team-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .ab-team h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
}

.page-about .ab-sec-body .ab-team-role {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--steel);
}

/* ---------- 观察员 ---------- */
.page-about .ab-scout-grid {
  display: grid;
  gap: 20px;
  align-items: start;
}

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

.page-about .ab-scout-text p {
  max-width: 36em;
  margin: 0 0 12px;
  line-height: 1.8;
  color: rgba(232, 228, 216, 0.82);
}

/* ---------- 归档流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 20px 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-flow li {
  position: relative;
  padding: 15px 16px 17px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
}

.page-about .ab-flow li:last-child {
  border-left: 2px solid var(--lime);
}

.page-about .ab-step-no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--red);
}

.page-about .ab-flow h3 {
  margin: 0 0 6px;
  font-size: 14.5px;
  font-weight: 700;
}

.page-about .ab-flow p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--steel);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  margin-top: clamp(30px, 5vw, 54px);
  padding: clamp(20px, 4vw, 34px);
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--red);
}

.page-about .ab-cta h2 {
  margin-bottom: 10px;
}

.page-about .ab-cta p {
  max-width: 42em;
  margin: 0;
  line-height: 1.75;
  color: rgba(232, 228, 216, 0.8);
}

.page-about .ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .ab-sec-side {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .ab-scout-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 26px;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .ab-flow li {
    border-right: none;
  }

  .page-about .ab-flow li + li {
    border-left: none;
  }

  .page-about .ab-flow li:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 30px;
    right: 0;
    width: 0;
    height: 0;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 6px solid var(--line-strong);
    transform: translateX(3px);
  }
}

@media (min-width: 1080px) {
  .page-about {
    --ab-side: 220px;
  }

  .page-about .ab-team-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team,
  .page-about .ab-seg {
    transition: none;
  }

  .page-about .ab-team:hover,
  .page-about .ab-team:focus-within {
    transform: none;
  }
}
<<<END>>>