.page-about {
  --ab-gold-line: rgba(201, 162, 39, 0.32);
  --ab-watermark: rgba(201, 162, 39, 0.09);
  position: relative;
  background: var(--ink-0);
  color: var(--ivory);
  font-family: var(--font-body);
  line-height: 1.85;
  overflow-x: clip;
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  border-bottom: 1px solid var(--rule);
  padding: clamp(24px, 3.5vw, 44px) 0 clamp(32px, 5vw, 64px);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.6vw, 68px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 16px 0 20px;
  color: var(--ivory);
}

.page-about .ab-hero__lead {
  max-width: 46ch;
  color: var(--ivory);
}

.page-about .ab-figures {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .ab-figures__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .ab-figures__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 32px);
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--gold-hi);
}

.page-about .ab-figures__label {
  font-size: var(--fs-sm);
  color: var(--mist);
  letter-spacing: 0.02em;
}

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

.page-about .ab-hero__media .sk-figure__frame {
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
}

.page-about .ab-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.86);
}

/* ---------- 主体两栏 ---------- */
.page-about .ab-body {
  display: grid;
  padding: clamp(20px, 3vw, 36px) 0 clamp(48px, 7vw, 88px);
}

.page-about .ab-rail {
  display: none;
}

.page-about .ab-rail__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  color: var(--mist);
  margin: 0 0 14px;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-rail__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: var(--fs-sm);
  color: var(--mist);
  text-decoration: none;
  padding: 6px 0;
  min-height: 32px;
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-rail__link:hover {
  color: var(--gold-hi);
}

.page-about .ab-rail__link:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 2px;
}

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--gold);
}

/* ---------- 章节 ---------- */
.page-about .ab-main {
  min-width: 0;
}

.page-about .ab-chapter {
  position: relative;
  border-bottom: 1px solid var(--rule);
  border-left: 1px solid var(--ab-gold-line);
  padding: clamp(30px, 4.5vw, 52px) 0 clamp(30px, 4.5vw, 52px) 16px;
}

.page-about .ab-chapter--last {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .ab-chapter__num {
  position: absolute;
  top: clamp(10px, 2vw, 20px);
  right: 0;
  font-family: var(--font-mono);
  font-size: clamp(64px, 9vw, 92px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ab-watermark);
  pointer-events: none;
  user-select: none;
}

.page-about .ab-chapter__title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin: 10px 0 20px;
  color: var(--ivory);
  position: relative;
  max-width: 20ch;
}

.page-about .ab-p {
  max-width: 66ch;
  margin: 0 0 1.1em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--ivory);
}

.page-about .ab-p--tight {
  margin: 0;
}

.page-about .ab-p--after {
  margin-top: 28px;
}

.page-about .ab-inline-link {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 200, 106, 0.45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-inline-link:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .ab-inline-link:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 2px;
}

/* ---------- 三点困扰 ---------- */
.page-about .ab-points {
  list-style: none;
  margin: 0 0 1.4em;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.page-about .ab-points li {
  background: var(--ink-0);
  padding: 16px 18px;
  font-size: var(--fs-body);
  line-height: 1.72;
  color: var(--ivory);
}

.page-about .ab-points strong {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--gold-hi);
  margin-bottom: 6px;
}

/* ---------- 年表 ---------- */
.page-about .ab-tl-wrap {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: 8px;
}

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

.page-about .ab-tl-figure .sk-figure__frame {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.page-about .ab-tl-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.82);
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.page-about .ab-tl__item {
  position: relative;
  border-left: 1px solid var(--rule);
  padding: 0 0 30px 26px;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 9px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--ink-0);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-tl__item--major::before {
  width: 9px;
  height: 9px;
  left: -5px;
  border-radius: 1px;
  border-color: var(--gold-hi);
  background: var(--gold-hi);
}

.page-about .ab-tl__item:hover::before {
  background: var(--gold);
  border-color: var(--gold-hi);
}

.page-about .ab-tl__batch {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  letter-spacing: 0.06em;
  color: var(--gold-hi);
  margin: 0 0 6px;
}

.page-about .ab-tl__title {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--ivory);
}

.page-about .ab-tl__note {
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
  max-width: 56ch;
  transition: color var(--dur) var(--ease);
}

.page-about .ab-tl__item:hover .ab-tl__note {
  color: var(--ivory);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-wrap {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

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

.page-about .ab-team-figure .sk-figure__frame {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.page-about .ab-team-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.84);
}

.page-about .ab-team {
  display: grid;
  gap: var(--gap-s);
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .ab-team__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px 18px;
  min-width: 0;
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-team__card:hover {
  border-color: var(--gold);
}

.page-about .ab-team__icon {
  width: 28px;
  height: 28px;
  color: var(--gold);
  flex: none;
}

.page-about .ab-team__card:nth-child(even) .ab-team__icon {
  color: var(--jade);
}

.page-about .ab-team__name {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  line-height: 1.3;
  margin: 0;
  color: var(--ivory);
}

.page-about .ab-team__text {
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
}

/* ---------- 校对步骤 ---------- */
.page-about .ab-steps {
  display: grid;
  gap: var(--gap-s);
  margin-top: 8px;
}

.page-about .ab-step {
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  min-width: 0;
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-step[open] {
  border-color: rgba(201, 162, 39, 0.62);
}

.page-about .ab-step__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: baseline;
  padding: 16px 18px;
  min-height: 44px;
  border-radius: var(--radius);
}

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

.page-about .ab-step__summary:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 2px;
}

.page-about .ab-step__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--gold-hi);
}

.page-about .ab-step__label {
  font-size: var(--fs-body);
  color: var(--ivory);
  font-weight: 600;
}

.page-about .ab-step__body {
  padding: 0 18px 18px;
}

.page-about .ab-step__body .ab-p {
  color: var(--mist);
  font-size: var(--fs-body);
}

/* ---------- 覆盖 ---------- */
.page-about .ab-cover {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
  margin-top: 8px;
}

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

.page-about .ab-cover__map {
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: clamp(16px, 3vw, 24px);
  min-width: 0;
}

.page-about .ab-cover__map svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 320px;
  margin: 0 auto;
}

.page-about .ab-cover__map circle {
  fill: var(--gold);
  opacity: 0.62;
  transition: opacity var(--dur) var(--ease);
}

.page-about .ab-cover__map circle.dot--jade {
  fill: var(--jade);
  opacity: 0.95;
}

.page-about .ab-cover__map circle:hover {
  opacity: 1;
}

.page-about .ab-cover__legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .ab-cover__swatch {
  width: 8px;
  height: 8px;
  background: var(--gold);
  opacity: 0.7;
  display: inline-block;
}

.page-about .ab-cover__swatch--jade {
  background: var(--jade);
  opacity: 1;
  margin-left: 8px;
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  position: relative;
  margin-top: 28px;
  background: var(--ink-1);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: clamp(22px, 3.5vw, 36px);
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 64px;
  height: 1px;
  background: var(--gold);
}

.page-about .ab-cta__title {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  line-height: 1.4;
  margin: 0 0 12px;
  color: var(--ivory);
  max-width: 34ch;
}

.page-about .ab-cta__text {
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--mist);
  margin: 0;
  max-width: 62ch;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .ab-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-cover {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-tl-wrap {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .ab-tl-figure {
    position: sticky;
    top: 96px;
  }

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

@media (min-width: 1000px) {
  .page-about .ab-body {
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 64px);
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    border-left: 1px solid var(--ab-gold-line);
    padding: 6px 0 0 18px;
  }

  .page-about .ab-chapter {
    border-left: none;
    padding-left: 0;
    padding-right: clamp(0px, 2vw, 32px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-tl__item::before,
  .page-about .ab-tl__note,
  .page-about .ab-team__card,
  .page-about .ab-step,
  .page-about .ab-inline-link,
  .page-about .ab-cover__map circle {
    transition: none;
  }

  .page-about .ab-tl-figure {
    position: static;
  }
}
<<<END>>>