.page-about {
  --ab-rail: 208px;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about p {
  margin: 0 0 14px;
  max-width: 64ch;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
}

.page-about .eyebrow {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .link-arrow {
  display: inline-block;
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 22px var(--gutter) 36px;
  border-bottom: 2px solid var(--city);
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(90deg, rgba(107, 124, 143, 0.14) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(0deg, rgba(107, 124, 143, 0.09) 0 1px, transparent 1px 84px);
}

.page-about .breadcrumbs {
  margin-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .breadcrumbs ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--line);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--concrete);
}

.page-about .breadcrumbs a {
  color: var(--stand);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) ease-out, border-color var(--speed) ease-out;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 8vw, 82px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--city);
  margin-top: 4px;
}

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

.page-about .ab-hero__deck {
  font-family: var(--font-serif);
  font-size: clamp(16px, 2.1vw, 20px);
  line-height: 1.75;
  color: var(--city);
  border-left: 3px solid var(--signal);
  padding-left: 16px;
  margin: 0 0 16px;
  max-width: 56ch;
}

.page-about .ab-hero__body p {
  font-size: 15px;
  color: var(--stand);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 24px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .ab-stat {
  background: var(--paper);
  padding: 12px 13px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--city);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--stand);
}

/* ---------- 分栏骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding: 0 var(--gutter) 56px;
}

.page-about .ab-rail {
  padding: 24px 0 12px;
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--signal);
}

.page-about .ab-rail__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 13px;
  color: var(--stand);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--speed) ease-out, border-color var(--speed) ease-out;
}

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

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--line);
}

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

.page-about .ab-sec {
  padding: 34px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-sec:last-child {
  border-bottom: 0;
  padding-bottom: 16px;
}

.page-about .ab-sec-head {
  margin-bottom: 20px;
}

.page-about .ab-sec-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.6vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--city);
}

.page-about .ab-sec-deck {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.75;
  color: var(--stand);
  margin-bottom: 22px;
}

.page-about .ab-lede {
  font-family: var(--font-serif);
  font-size: clamp(16px, 2.4vw, 20px);
  line-height: 1.72;
  color: var(--city);
  margin-bottom: 16px;
}

.page-about .ab-split__text p:not(.ab-lede),
.page-about .ab-team__text p:not(.ab-lede),
.page-about .ab-culture p:not(.ab-lede),
.page-about .ab-contact__text p {
  font-size: 15px;
  color: var(--stand);
}

/* ---------- 使命分屏 ---------- */
.page-about .ab-split {
  display: grid;
  gap: 22px;
}

.page-about .ab-split__media,
.page-about .ab-legend__map,
.page-about .ab-team__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--city);
  background: var(--stand);
}

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

.page-about .ab-split__media img {
  aspect-ratio: 7 / 5;
}

.page-about .media-frame__label {
  position: absolute;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  background: var(--city);
  color: var(--paper);
}

/* ---------- 栏目图例 ---------- */
.page-about .ab-legend {
  display: grid;
  gap: 22px;
}

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

.page-about .ab-legend__item {
  position: relative;
  padding: 16px 16px 16px 20px;
  border: 1px solid var(--rule);
  background: rgba(244, 241, 234, 0.55);
  transition: border-color var(--speed) ease-out, background var(--speed) ease-out;
}

.page-about .ab-legend__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--line);
  transition: background var(--speed) ease-out;
}

.page-about .ab-legend__item--a::before {
  background: var(--signal);
}

.page-about .ab-legend__item--b::before {
  background: var(--amber);
}

.page-about .ab-legend__item--c::before {
  background: var(--mint);
}

.page-about .ab-legend__item:hover,
.page-about .ab-legend__item:focus-within {
  border-color: var(--city);
  background: #fffdf8;
}

.page-about .ab-legend__num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--line);
}

.page-about .ab-legend__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--city);
  margin-bottom: 6px;
}

.page-about .ab-legend__item p {
  font-size: 14px;
  line-height: 1.68;
  color: var(--stand);
  margin-bottom: 8px;
}

.page-about .ab-legend__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--line);
}

.page-about .ab-legend__map img {
  aspect-ratio: 10 / 7;
}

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

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 22px 26px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 14px;
  height: 2px;
  background: var(--line);
  transition: background var(--speed) ease-out, width var(--speed) ease-out;
}

.page-about .ab-timeline__item:hover::before,
.page-about .ab-timeline__item:focus-within::before {
  background: var(--signal);
  width: 22px;
}

.page-about .ab-timeline__year {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 4vw, 29px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--city);
  margin-bottom: 6px;
  transition: color var(--speed) ease-out;
}

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

.page-about .ab-timeline__item h3 {
  font-family: var(--font-serif);
  font-size: 16px;
  margin-bottom: 4px;
  color: var(--ink);
}

.page-about .ab-timeline__item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--stand);
  max-width: 58ch;
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 24px;
}

.page-about .ab-team__media img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin-top: 22px;
}

.page-about .ab-figure {
  padding-top: 10px;
  border-top: 2px solid var(--city);
}

.page-about .ab-figure__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--city);
}

.page-about .ab-figure__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--stand);
}

/* ---------- 城市与看台 ---------- */
.page-about .ab-culture {
  display: grid;
  gap: 16px;
}

.page-about .ab-culture__panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 8px;
  padding: 22px 20px;
  background: var(--city);
  border-left: 4px solid var(--signal);
}

.page-about .ab-culture__panel .ab-figure {
  border-top-color: rgba(244, 241, 234, 0.3);
}

.page-about .ab-culture__panel .ab-figure__num {
  color: var(--signal-soft);
}

.page-about .ab-culture__panel .ab-figure__label {
  color: rgba(244, 241, 234, 0.76);
}

.page-about .ab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 6px 0 4px;
}

.page-about .ab-tag {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--rule);
  background: rgba(244, 241, 234, 0.8);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--stand);
  transition: border-color var(--speed) ease-out, color var(--speed) ease-out;
}

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

/* ---------- 联系 ---------- */
.page-about .ab-contact {
  display: grid;
  gap: 24px;
}

.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 4px;
}

.page-about .contact-list {
  margin: 0;
  border-top: 1px solid var(--rule);
}

.page-about .contact-item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--line);
}

.page-about .contact-value {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}

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

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 34px;
    align-items: end;
  }

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

  .page-about .ab-legend__item--c {
    grid-column: span 2;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .ab-hero {
    padding: 28px var(--gutter) 48px;
  }

  .page-about .ab-shell {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 0 56px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    padding: 46px 0 8px 18px;
    border-bottom: 0;
    border-left: 2px solid var(--signal);
  }

  .page-about .ab-rail__list a {
    padding: 9px 0;
    font-size: 13px;
  }

  .page-about .ab-sec {
    padding: 48px 0;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-legend {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 36px;
    align-items: start;
  }

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

  .page-about .ab-legend__item--c {
    grid-column: auto;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .ab-culture__panel {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 26px 24px;
  }

  .page-about .ab-contact {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .ab-timeline__item:nth-child(2) {
    margin-left: 26px;
  }

  .page-about .ab-timeline__item:nth-child(3) {
    margin-left: 52px;
  }

  .page-about .ab-timeline__item:nth-child(4) {
    margin-left: 78px;
  }

  .page-about .ab-timeline__item:nth-child(5) {
    margin-left: 104px;
  }

  .page-about .ab-timeline__item:nth-child(6) {
    margin-left: 130px;
  }
}
<<<END>>>