.page-about {
  --ab-pad: clamp(24px, 4vw, 56px);
  --ab-rule: 1px solid var(--stone);
  --ab-dash: 1px dashed rgba(124, 140, 166, 0.42);
  background: var(--ink);
  color: var(--sand);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(18px, 3vw, 34px) 0 clamp(40px, 6vw, 76px);
  position: relative;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), rgba(47, 227, 198, 0.15) 38%, var(--stone) 100%);
  opacity: 0.6;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 44px);
}

.page-about .ab-hero .coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 14px 0 18px;
  max-width: 15em;
}

.page-about .ab-hero .lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(233, 216, 188, 0.9);
  margin: 0;
  max-width: 34em;
}

.page-about .ab-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--stone);
  border: var(--ab-rule);
}

.page-about .ab-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  background: var(--ink);
  padding: 12px 14px;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(233, 216, 188, 0.92);
}

.page-about .ab-facts__num {
  flex: none;
  min-width: 2.4em;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .ab-hero__figure .figure__frame {
  border: var(--ab-rule);
  background: linear-gradient(155deg, var(--ink-2), var(--ink) 72%);
  overflow: hidden;
}

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

.page-about .ab-hero__figure .figure__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-top: 10px;
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body__inner {
  display: grid;
  gap: 44px;
  padding-top: clamp(28px, 5vw, 56px);
}

.page-about .ab-sec {
  padding: clamp(28px, 4vw, 46px) 0;
  border-bottom: var(--ab-dash);
  scroll-margin-top: 96px;
}

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

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

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .ab-sec__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid rgba(47, 227, 198, 0.42);
  padding: 2px 6px;
  line-height: 1.2;
}

.page-about .ab-sec h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 29px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0;
}

.page-about .ab-sec p {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(233, 216, 188, 0.9);
  margin: 0 0 16px;
  max-width: 34em;
}

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

/* ---------- 使用场景 ---------- */
.page-about .ab-scenes {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-scene {
  position: relative;
  background: var(--ink-2);
  border: var(--ab-rule);
  padding: 16px 18px;
}

.page-about .ab-scene::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: var(--cyan);
  opacity: 0.85;
}

.page-about .ab-scene h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .ab-scene p {
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
  max-width: none;
}

/* ---------- 结构迭代轨道 ---------- */
.page-about .ab-track {
  list-style: none;
  margin: 22px 0 8px;
  padding: 0;
  position: relative;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--orange));
  opacity: 0.5;
}

.page-about .ab-track__item {
  position: relative;
  padding: 0 0 24px 32px;
}

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

.page-about .ab-track__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 7px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--cyan);
  background: var(--ink);
  border-radius: 50%;
}

.page-about .ab-track__item:last-child::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .ab-track__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 5px;
}

.page-about .ab-track__item h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .ab-track__item p {
  font-size: 15px;
  line-height: 1.75;
  margin: 0;
  max-width: 34em;
}

/* ---------- 图片块 ---------- */
.page-about .ab-figure {
  margin: 26px 0 0;
}

.page-about .ab-figure .figure__frame {
  border: var(--ab-rule);
  background:
    repeating-linear-gradient(0deg, rgba(44, 56, 76, 0.45) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, rgba(44, 56, 76, 0.45) 0 1px, transparent 1px 26px),
    var(--ink-2);
  overflow: hidden;
}

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

.page-about .ab-figure .figure__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-top: 10px;
}

.page-about .ab-figure--panel {
  margin: 22px 0 20px;
}

/* ---------- 引文 ---------- */
.page-about .ab-quote {
  position: relative;
  margin: 26px 0 0;
  padding: 22px 24px;
  background:
    repeating-linear-gradient(0deg, rgba(44, 56, 76, 0.35) 0 1px, transparent 1px 6px),
    var(--ink-2);
  border: var(--ab-rule);
  border-left: 3px solid var(--orange);
}

.page-about .ab-quote::after {
  content: "";
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 10px;
  height: 10px;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
}

.page-about .ab-quote p {
  margin: 0;
  font-size: 17px;
  line-height: 1.72;
  color: var(--paper);
  max-width: 30em;
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
}

.page-about .ab-team__cell {
  background: var(--ink-2);
  border: var(--ab-rule);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-team__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--orange);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-team__role {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .ab-team__cell p {
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
  max-width: none;
  color: rgba(233, 216, 188, 0.82);
}

/* ---------- 合作标签条 ---------- */
.page-about .ab-marquee {
  overflow: hidden;
  margin: 22px 0 20px;
  padding: 12px 0;
  border-top: var(--ab-rule);
  border-bottom: var(--ab-rule);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
}

.page-about .ab-marquee__track {
  display: flex;
  gap: 10px;
  width: max-content;
  animation: ab-drift 30s linear infinite;
}

.page-about .ab-chip {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--sand);
  background: var(--ink-2);
  border: 1px solid var(--stone);
  border-radius: 999px;
  padding: 7px 14px;
  white-space: nowrap;
}

@keyframes ab-drift {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-marquee__track {
    animation: none;
  }
}

/* ---------- 行动入口 ---------- */
.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* ---------- 右侧章节刻度 ---------- */
.page-about .ab-timeline {
  display: none;
}

.page-about .ab-timeline__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin: 0 0 16px;
  padding-left: 14px;
  border-left: 1px solid var(--stone);
}

.page-about .ab-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), rgba(47, 227, 198, 0.12) 55%, var(--orange));
  opacity: 0.55;
}

.page-about .ab-timeline__item {
  position: relative;
}

.page-about .ab-tick {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 16px;
  text-decoration: none;
  position: relative;
  transition: transform var(--dur) var(--ease);
}

.page-about .ab-tick::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 15px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-tick__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .ab-tick__name {
  font-size: 13px;
  color: rgba(233, 216, 188, 0.72);
  white-space: nowrap;
}

.page-about .ab-tick:hover .ab-tick__name,
.page-about .ab-tick:focus-visible .ab-tick__name {
  color: var(--paper);
}

.page-about .ab-tick:hover::before,
.page-about .ab-tick:focus-visible::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .ab-tick:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 700px) {
  .page-about .ab-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .ab-hero__figure {
    margin-top: clamp(12px, 3vw, 46px);
  }

  .page-about .ab-figure img,
  .page-about .ab-figure--panel img {
    max-height: 520px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-body__inner {
    grid-template-columns: minmax(0, 40em) minmax(150px, 1fr);
    gap: clamp(40px, 6vw, 84px);
    align-items: start;
  }

  .page-about .ab-timeline {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    max-height: calc(100vh - 130px);
  }
}

@media (min-width: 1280px) {
  .page-about .ab-body__inner {
    grid-template-columns: minmax(0, 42em) minmax(170px, 1fr);
  }
}
<<<END>>>