.page-about {
  --ab-line: rgba(74, 127, 165, .30);
  --ab-line-soft: rgba(232, 229, 222, .10);
  --ab-amber: #F2B233;
  --ab-tone: var(--bw-red);
  color: var(--bw-text);
}

.page-about .ab-flow,
.page-about .ab-prose,
.page-about .ab-split__text,
.page-about .ab-venues__info {
  min-width: 0;
  overflow-wrap: break-word;
}

/* 面包屑 */
.page-about .bw-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5em;
  padding: clamp(14px, 2.2vw, 26px) 0 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--bw-text-faint);
}
.page-about .bw-crumbs a {
  color: var(--bw-text-dim);
  text-decoration: none;
  transition: color .18s var(--bw-ease);
}
.page-about .bw-crumbs a:hover { color: var(--bw-white); }
.page-about .bw-crumbs__sep { color: var(--bw-line-strong); }

/* 首屏 */
.page-about .ab-hero {
  padding: clamp(22px, 4vw, 52px) 0 clamp(34px, 5vw, 74px);
}
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}
@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(270px, 1fr);
    align-items: end;
  }
}
.page-about .ab-hero__title {
  margin: .35em 0 .5em;
  max-width: 20ch;
  font-family: var(--bw-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 58px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--bw-white);
}
.page-about .ab-hero__lede {
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--bw-text-dim);
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .ab-hero__board {
  border: 1px solid var(--ab-line);
  border-top: 2px solid var(--bw-red);
  background:
    linear-gradient(180deg, rgba(200, 51, 43, .08), rgba(20, 22, 26, 0) 62%),
    var(--bw-asphalt);
  padding: clamp(16px, 2.3vw, 24px);
}
.page-about .ab-board {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}
.page-about .ab-board li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 0;
  border-top: 1px dashed var(--ab-line-soft);
}
.page-about .ab-board li:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .ab-board__v {
  font-family: var(--bw-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--bw-amber);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-board__k {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--bw-text-dim);
}

/* 侧栏索引 + 正文 */
.page-about .ab-shell {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 90px);
}
@media (min-width: 1024px) {
  .page-about .ab-shell {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 60px);
  }
}
.page-about .ab-rail { display: none; }
@media (min-width: 1024px) {
  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 118px;
    align-self: start;
  }
}
.page-about .ab-rail__head {
  margin: 0 0 10px;
  color: var(--bw-text-faint);
}
.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}
.page-about .ab-rail__link {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 8px;
  align-items: center;
  padding: 9px 8px 9px 10px;
  border-left: 1px solid var(--ab-line);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bw-text-faint);
  text-decoration: none;
  transition: color .18s var(--bw-ease), border-color .18s var(--bw-ease), background-color .18s var(--bw-ease);
}
.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--bw-white);
  border-left-color: var(--bw-red);
  background: rgba(200, 51, 43, .08);
}
.page-about .ab-rail__link.is-active {
  color: var(--bw-white);
  border-left-color: var(--bw-red);
}
.page-about .ab-rail__num {
  font-family: var(--bw-mono);
  font-size: 11px;
  color: var(--bw-amber);
  font-variant-numeric: tabular-nums;
}

/* 章节 */
.page-about .ab-sec {
  padding: clamp(28px, 4.6vw, 60px) 0;
  border-top: 1px solid var(--ab-line-soft);
}
.page-about .ab-flow > .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .ab-sec .bw-eyebrow { color: var(--bw-amber); }
.page-about .ab-sec .bw-h2 {
  margin: .25em 0 .6em;
  max-width: 26ch;
  font-family: var(--bw-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.3vw, 38px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--bw-white);
}
.page-about .ab-lead-in {
  margin: 0 0 clamp(14px, 2vw, 20px);
  max-width: 62ch;
  font-size: clamp(14px, 1.3vw, 16px);
  line-height: 1.78;
  color: var(--bw-text-dim);
}

.page-about .ab-prose p,
.page-about .ab-split__text > p {
  margin: 0 0 1.05em;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--bw-text-dim);
}
.page-about .ab-prose p:last-child { margin-bottom: 0; }

.page-about .ab-link {
  color: var(--bw-white);
  text-decoration: none;
  border-bottom: 1px solid var(--bw-red);
  transition: color .18s var(--bw-ease), border-color .18s var(--bw-ease);
}
.page-about .ab-link:hover {
  color: var(--bw-amber);
  border-bottom-color: var(--bw-amber);
}

/* 图文错位 */
.page-about .ab-split {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
  margin-top: clamp(14px, 2vw, 24px);
}
@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }
  .page-about .ab-split--media-first {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  }
  .page-about .ab-split--media-first .ab-split__media { order: -1; }
}

/* 图片容器 */
.page-about .ab-fig { margin: 0; }
.page-about .ab-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background:
    repeating-linear-gradient(0deg, var(--ab-line-soft) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, var(--ab-line-soft) 0 1px, transparent 1px 32px),
    var(--bw-asphalt);
}
.page-about .ab-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}
.page-about .ab-frame--16x9 { aspect-ratio: 16 / 9; }
.page-about .ab-frame--3x2 { aspect-ratio: 3 / 2; }
.page-about .ab-frame--8x3 { aspect-ratio: 8 / 3; }
.page-about .ab-fig figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--bw-text-faint);
}
.page-about .ab-fig--wide { margin-top: clamp(24px, 3.4vw, 40px); }

/* 场馆网络 */
.page-about .ab-venues {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  margin-top: clamp(14px, 2vw, 24px);
}
@media (min-width: 980px) {
  .page-about .ab-venues {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
  }
}
.page-about .ab-map {
  display: block;
  width: 100%;
  height: auto;
  padding: clamp(12px, 2vw, 20px);
  border: 1px solid var(--ab-line);
  background:
    repeating-linear-gradient(90deg, rgba(74, 127, 165, .07) 0 1px, transparent 1px 24px),
    rgba(35, 38, 43, .55);
}
.page-about .ab-venues__legend {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: .04em;
  color: var(--bw-text-faint);
}
.page-about .ab-venues__info p {
  margin: 0 0 1.05em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--bw-text-dim);
}
.page-about .ab-venues__info p:last-child { margin-bottom: 0; }

/* 走访步骤 */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}
@media (min-width: 820px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .ab-steps__item {
  padding: clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--ab-line-soft);
  border-top: 2px solid var(--bw-blue);
  background: rgba(35, 38, 43, .55);
  transition: border-color .18s var(--bw-ease), transform .18s var(--bw-ease);
}
.page-about .ab-steps__item:hover {
  border-color: var(--ab-line);
  transform: translateY(-2px);
}
.page-about .ab-steps__n {
  display: block;
  font-family: var(--bw-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--bw-amber);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-steps__item h3 {
  margin: .55em 0 .45em;
  font-size: 16px;
  line-height: 1.45;
  color: var(--bw-white);
}
.page-about .ab-steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bw-text-dim);
}

/* 团队分工 */
.page-about .ab-team {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(16px, 2.4vw, 26px);
}
@media (min-width: 820px) {
  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .ab-team__card {
  --ab-tone: var(--bw-red);
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background:
    linear-gradient(180deg, rgba(74, 127, 165, .08), rgba(35, 38, 43, 0) 62%),
    var(--bw-asphalt);
  border: 1px solid var(--ab-line-soft);
  transition: border-color .18s var(--bw-ease);
}
.page-about .ab-team__card--data { --ab-tone: var(--bw-amber); }
.page-about .ab-team__card--venue { --ab-tone: var(--bw-green); }
.page-about .ab-team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--ab-tone);
  opacity: .9;
}
.page-about .ab-team__card:hover { border-color: var(--ab-line); }
.page-about .ab-team__card h3 {
  margin: .8em 0 .5em;
  font-size: 17px;
  line-height: 1.45;
  color: var(--bw-white);
}
.page-about .ab-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--bw-text-dim);
}

/* 成长阶段 */
.page-about .ab-stages {
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}
@media (min-width: 700px) {
  .page-about .ab-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1180px) {
  .page-about .ab-stages {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .ab-stages__item {
  padding: clamp(16px, 2.2vw, 22px) clamp(14px, 2vw, 20px) clamp(14px, 2vw, 18px);
  border-top: 1px solid var(--ab-line);
  background: linear-gradient(180deg, rgba(74, 127, 165, .07), rgba(20, 22, 26, 0) 72%);
}
.page-about .ab-stages__idx {
  display: block;
  font-family: var(--bw-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--bw-amber);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-stages__item h3 {
  margin: .7em 0 .45em;
  font-size: 15px;
  line-height: 1.5;
  color: var(--bw-white);
}
.page-about .ab-stages__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--bw-text-dim);
}

/* 数字看板 */
.page-about .ab-stats {
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--ab-line-soft);
  background: var(--ab-line-soft);
}
@media (min-width: 640px) {
  .page-about .ab-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1024px) {
  .page-about .ab-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.page-about .ab-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--bw-charcoal);
  transition: background-color .18s var(--bw-ease);
}
.page-about .ab-stats__item:hover { background: var(--bw-asphalt); }
.page-about .ab-stats__v {
  font-family: var(--bw-mono);
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--bw-amber);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-stats__k {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--bw-white);
}
.page-about .ab-stats__note {
  font-size: 12px;
  line-height: 1.6;
  color: var(--bw-text-faint);
}

/* 合作对接 */
.page-about .ab-partners {
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}
@media (min-width: 760px) {
  .page-about .ab-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-partners__item {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--ab-line-soft);
  background: linear-gradient(180deg, rgba(35, 38, 43, .85), rgba(20, 22, 26, .85));
  transition: border-color .18s var(--bw-ease), transform .18s var(--bw-ease);
}
.page-about .ab-partners__item:hover,
.page-about .ab-partners__item:focus-within {
  border-color: var(--bw-line-strong);
  transform: translateY(-2px);
}
.page-about .ab-partners__item h3 {
  margin: .8em 0 .5em;
  font-size: 17px;
  line-height: 1.45;
  color: var(--bw-white);
}
.page-about .ab-partners__item > p {
  margin: 0 0 1em;
  font-size: 14px;
  line-height: 1.76;
  color: var(--bw-text-dim);
}
.page-about .ab-partners__list {
  list-style: none;
  margin: 0 0 1.1em;
  padding: 0;
  display: grid;
  gap: 7px;
}
.page-about .ab-partners__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--bw-text-dim);
}
.page-about .ab-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 1px;
  background: var(--bw-amber);
}

/* 底部行动区 */
.page-about .ab-cta {
  margin-top: clamp(24px, 3.6vw, 42px);
  padding: clamp(20px, 3vw, 34px);
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--bw-red);
  background:
    linear-gradient(115deg, rgba(200, 51, 43, .16), rgba(20, 22, 26, 0) 62%),
    var(--bw-asphalt);
}
@media (min-width: 820px) {
  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
  }
}
.page-about .ab-cta h3 {
  margin: 0 0 .55em;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.4;
  color: var(--bw-white);
}
.page-about .ab-cta p {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.76;
  color: var(--bw-text-dim);
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.page-about .bw-copy__hint {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bw-green-ink);
}