.page-about {
  --ab-radius-card: 3px;
  display: block;
}

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

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--bx-lake-soft);
  outline-offset: 2px;
}

/* ---------- 区块节奏与底色 ---------- */
.page-about .ab-sec {
  padding: clamp(56px, 8vw, 108px) 0;
  position: relative;
}

.page-about .ab-sec--dark { background: var(--bx-abyss); color: var(--bx-on-dark); }
.page-about .ab-sec--night { background: var(--bx-night); color: var(--bx-on-dark); }
.page-about .ab-sec--sand { background: var(--bx-sand); color: var(--bx-ink); }
.page-about .ab-sec--paper { background: var(--bx-paper); color: var(--bx-ink); }

.page-about .ab-sec h2 { margin: 10px 0 14px; }
.page-about .ab-sec h3 { margin: 0 0 8px; }
.page-about .ab-sec p { margin: 0 0 14px; }

.page-about .ab-sec--dark h2,
.page-about .ab-sec--dark h3,
.page-about .ab-sec--night h2,
.page-about .ab-sec--night h3 { color: var(--bx-paper); }

.page-about .ab-eyebrow { color: var(--bx-lake-soft); }
.page-about .ab-sec--sand .ab-eyebrow,
.page-about .ab-sec--paper .ab-eyebrow { color: var(--bx-lake); }

.page-about .ab-sec__head { max-width: 74ch; }
.page-about .ab-sec__intro {
  max-width: 68ch;
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: clamp(36px, 6vw, 72px);
  padding-bottom: clamp(48px, 7vw, 96px);
  overflow: hidden;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 44px);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--bx-on-dark-soft);
}

.page-about .ab-crumb a {
  color: var(--bx-on-dark-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: var(--bx-ease);
}

.page-about .ab-crumb a:hover {
  color: var(--bx-flag-soft);
  border-bottom-color: var(--bx-flag-soft);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 64px);
}

.page-about .ab-hero__title {
  margin: 12px 0 20px;
  color: var(--bx-paper);
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  max-width: 62ch;
  color: var(--bx-on-dark);
}

.page-about .ab-hero__metrics {
  display: grid;
  gap: 2px;
  align-content: start;
}

.page-about .ab-metric {
  padding: 12px 0 12px 18px;
  border-left: 2px solid var(--bx-hair-dark);
}

.page-about .ab-metric--flag { border-left-color: var(--bx-flag); }

.page-about .ab-metric__num {
  display: block;
  font-family: var(--bx-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.05;
  color: var(--bx-paper);
}

.page-about .ab-metric--hero .ab-metric__num {
  font-size: clamp(56px, 13vw, 132px);
  letter-spacing: -.03em;
  color: var(--bx-paper);
}

.page-about .ab-metric--flag .ab-metric__num { color: var(--bx-flag); }

.page-about .ab-metric__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--bx-on-dark-soft);
}

.page-about .ab-hero__banner {
  margin: clamp(36px, 6vw, 72px) 0 0;
}

.page-about .bx-figure__frame {
  overflow: hidden;
  border-radius: var(--ab-radius-card);
  background: var(--bx-night);
}

.page-about .bx-figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .bx-figure__caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--bx-on-dark-soft);
}

.page-about .ab-sec--sand .bx-figure__caption,
.page-about .ab-sec--paper .bx-figure__caption { color: var(--bx-ink-soft); }

/* ---------- 跳读条 ---------- */
.page-about .ab-jump {
  background: var(--bx-night);
  border-top: 1px solid var(--bx-hair-dark);
  border-bottom: 1px solid var(--bx-hair-dark);
}

.page-about .ab-jump__inner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  padding-bottom: 12px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-jump__label {
  flex: 0 0 auto;
  color: var(--bx-on-dark-soft);
  padding-right: 6px;
}

.page-about .ab-jump a {
  flex: 0 0 auto;
  padding: 6px 13px;
  border: 1px solid var(--bx-hair-dark);
  border-radius: 999px;
  font-size: 13px;
  color: var(--bx-on-dark);
  text-decoration: none;
  transition: var(--bx-ease);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  border-color: var(--bx-flag);
  color: var(--bx-paper);
  background: rgba(228, 87, 46, .16);
}

/* ---------- 平台来历 ---------- */
.page-about .ab-about {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .ab-about__head h2 { margin-top: 10px; }

.page-about .ab-about__body p {
  max-width: 68ch;
  line-height: 1.75;
}

.page-about .ab-facts {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  border-top: 1px solid var(--bx-hair-light);
}

.page-about .ab-fact {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--bx-hair-light);
}

.page-about .ab-fact__k {
  font-size: 14px;
  color: var(--bx-ink-soft);
}

.page-about .ab-fact__v {
  font-family: var(--bx-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--bx-ink);
}

/* ---------- 简史内容索引 ---------- */
.page-about .ab-index {
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--bx-hair-dark);
}

.page-about .ab-index__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--bx-hair-dark);
}

.page-about .ab-index__key {
  position: relative;
  padding-left: 16px;
  font-weight: 700;
  color: var(--bx-paper);
}

.page-about .ab-index__key::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bx-flag);
}

.page-about .ab-index__val {
  color: var(--bx-on-dark);
  line-height: 1.7;
}

.page-about .ab-structure {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--bx-hair-dark);
  background: rgba(6, 16, 28, .62);
  border-left: 3px solid var(--bx-lake);
}

.page-about .ab-structure__title {
  margin: 0 0 16px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--bx-lake-soft);
}

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

.page-about .ab-structure__list li {
  display: flex;
  gap: 12px;
  line-height: 1.7;
  color: var(--bx-on-dark);
}

.page-about .ab-structure__step {
  flex: 0 0 auto;
  font-family: var(--bx-font-mono);
  font-size: 13px;
  color: var(--bx-flag);
  padding-top: 3px;
}

/* ---------- 赛季时间轴 ---------- */
.page-about .ab-timeline {
  display: grid;
  gap: clamp(20px, 3vw, 44px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .ab-timeline__rail {
  position: sticky;
  top: 0;
  z-index: 4;
  background: var(--bx-paper);
  padding: 6px 0;
  border-bottom: 1px solid var(--bx-hair-light);
}

.page-about .ab-timeline__years {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-timeline__years a {
  display: block;
  flex: 0 0 auto;
  padding: 6px 9px;
  font-family: var(--bx-font-mono);
  font-size: 14px;
  color: var(--bx-ink-soft);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: var(--bx-ease);
}

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

.page-about .ab-timeline__body {
  display: grid;
}

.page-about .ab-season {
  position: relative;
  padding: 0 0 30px 22px;
  border-left: 1px solid var(--bx-hair-light);
}

.page-about .ab-season::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bx-flag);
}

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

.page-about .ab-season__year {
  margin: 0 0 4px;
  font-family: var(--bx-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  letter-spacing: .05em;
  color: var(--bx-lake);
}

.page-about .ab-season__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 6px 0 10px;
  font-family: var(--bx-font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--bx-ink-soft);
}

.page-about .ab-season__meta span { position: relative; }

.page-about .ab-season__meta span + span::before {
  content: "·";
  position: absolute;
  left: -11px;
  color: var(--bx-line);
}

.page-about .ab-season p {
  max-width: 66ch;
  line-height: 1.72;
}

/* ---------- 阵容卡片 ---------- */
.page-about .ab-squad {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .ab-field {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 6px 16px;
  padding: 15px 18px;
  background: var(--bx-paper);
  border: 1px solid var(--bx-hair-light);
  border-left: 3px solid var(--bx-lake);
  border-radius: var(--ab-radius-card);
  transition: var(--bx-ease);
  cursor: default;
}

.page-about .ab-field + .ab-field { margin-top: 10px; }

.page-about .ab-field:hover,
.page-about .ab-field:focus,
.page-about .ab-field:focus-within {
  border-left-color: var(--bx-flag);
  box-shadow: 0 8px 20px rgba(11, 27, 43, .12);
}

.page-about .ab-field__name {
  font-weight: 700;
  color: var(--bx-ink);
}

.page-about .ab-field__val {
  font-family: var(--bx-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  color: var(--bx-flag);
  white-space: nowrap;
}

.page-about .ab-field__tip {
  grid-column: 1 / -1;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--bx-ink-soft);
  transition: var(--bx-ease);
}

.page-about .ab-field:hover .ab-field__tip,
.page-about .ab-field:focus .ab-field__tip,
.page-about .ab-field:focus-within .ab-field__tip {
  max-height: 140px;
  opacity: 1;
  margin-top: 4px;
}

.page-about .ab-squad__note {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--bx-hair-light);
  max-width: 66ch;
  line-height: 1.75;
  color: var(--bx-ink-soft);
}

.page-about .ab-squad__figure { margin: 0; }

/* ---------- 核校团队 ---------- */
.page-about .ab-verify {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .ab-group {
  padding: 16px 0;
  border-top: 1px solid var(--bx-hair-dark);
}

.page-about .ab-group:last-of-type { border-bottom: 1px solid var(--bx-hair-dark); }

.page-about .ab-group__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 6px;
}

.page-about .ab-group__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bx-flag);
  flex: 0 0 auto;
}

.page-about .ab-group__dot--lake { background: var(--bx-lake-soft); }
.page-about .ab-group__dot--verify { background: var(--bx-verify); }

.page-about .ab-group__name {
  font-weight: 700;
  color: var(--bx-paper);
}

.page-about .ab-group p { max-width: 62ch; line-height: 1.72; }

.page-about .ab-timing {
  margin: clamp(24px, 3vw, 34px) 0 0;
  display: grid;
}

.page-about .ab-timing > div {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--bx-hair-dark);
}

.page-about .ab-timing dt {
  font-family: var(--bx-font-mono);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--bx-lake-soft);
}

.page-about .ab-timing dd {
  margin: 0;
  max-width: 60ch;
  line-height: 1.7;
  color: var(--bx-on-dark);
}

.page-about .ab-verify__figure { margin: 0; }

.page-about .ab-verify__figure .bx-figure__frame {
  aspect-ratio: 3 / 2;
  border: 1px solid var(--bx-hair-dark);
}

/* ---------- 使用场景 ---------- */
.page-about .ab-users {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .ab-user {
  padding: 22px 20px;
  background: var(--bx-paper);
  border: 1px solid var(--bx-hair-light);
  border-top: 3px solid var(--bx-lake);
  border-radius: var(--ab-radius-card);
  transition: var(--bx-ease);
}

.page-about .ab-user:hover {
  border-top-color: var(--bx-flag);
  box-shadow: 0 10px 24px rgba(11, 27, 43, .12);
}

.page-about .ab-user h3 { color: var(--bx-ink); }

.page-about .ab-user p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--bx-ink-soft);
}

.page-about .ab-partners__note {
  margin: clamp(28px, 4vw, 40px) 0 0;
  max-width: 70ch;
  padding-left: 18px;
  border-left: 3px solid var(--bx-flag);
  line-height: 1.75;
  color: var(--bx-ink-soft);
}

.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-about {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .ab-index__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .ab-structure__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }

  .page-about .ab-users {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
  }

  .page-about .ab-user:nth-child(2),
  .page-about .ab-user:nth-child(4) { margin-top: 34px; }

  .page-about .ab-verify {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .ab-timeline {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-timeline__rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-bottom: none;
    border-right: 1px solid var(--bx-hair-light);
    padding: 0 12px 0 0;
    background: transparent;
  }

  .page-about .ab-timeline__years {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .ab-timeline__years a {
    padding: 6px 8px 6px 0;
    border-bottom: none;
    border-left: 2px solid transparent;
    padding-left: 10px;
  }

  .page-about .ab-timeline__years a:hover,
  .page-about .ab-timeline__years a:focus-visible {
    border-left-color: var(--bx-flag);
    border-bottom-color: transparent;
    color: var(--bx-flag);
  }

  .page-about .ab-squad {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .ab-facts {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    column-gap: 24px;
  }

  .page-about .ab-fact {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px 0;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__metrics { padding-top: 12px; }
  .page-about .ab-season { padding-bottom: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}