.page-about {
  --ab-measure: 720px;
  --ab-paper-line: rgba(27, 33, 48, .16);
  --ab-paper-soft: rgba(27, 33, 48, .62);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 88px 0 16px;
}

.page-about .ab-hero__frame {
  position: relative;
  margin-top: 20px;
}

.page-about .ab-hero__inner {
  display: grid;
  gap: 24px;
  padding: 20px;
}

.page-about .ab-hero__media {
  position: relative;
  overflow: hidden;
  border-radius: 10px;
  border: var(--gs-edge);
  background: linear-gradient(160deg, var(--gs-ink), var(--gs-void));
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  filter: saturate(.9) brightness(.82);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(6, 11, 24, 0) 38%, rgba(6, 11, 24, .88) 100%);
  pointer-events: none;
}

.page-about .ab-hero__text {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__text .gs-lead {
  max-width: 46ch;
	margin-top: 14px;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: var(--gs-edge);
}

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

.page-about .ab-fact dt {
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gs-silver);
  margin-bottom: 6px;
}

.page-about .ab-fact dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.4;
  color: var(--gs-silver);
}

.page-about .ab-fact__num {
  display: inline-block;
  font-family: var(--gs-font-score);
  font-size: 26px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--gs-white);
  margin-right: 3px;
}

.page-about .ab-fact__plus {
  color: var(--gs-cyan);
  font-weight: 700;
}

/* ---------- 主体骨架：索引轴 + 正文 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: 28px;
  padding: 44px 0 72px;
}

.page-about .ab-index {
  border-top: var(--gs-edge);
  padding-top: 14px;
}

.page-about .ab-index__title {
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gs-silver);
  margin: 0 0 12px;
}

.page-about .ab-index__list {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-index__link {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border: var(--gs-edge);
  border-radius: 999px;
  text-decoration: none;
  color: var(--gs-silver);
  font-size: 13px;
  background: var(--gs-ink);
  transition: color 120ms var(--gs-ease), border-color 120ms var(--gs-ease), background-color 120ms var(--gs-ease);
}

.page-about .ab-index__num {
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--gs-cyan);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--gs-white);
  border-color: var(--gs-cyan);
  background: var(--gs-stand);
}

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

/* ---------- 章节 ---------- */
.page-about .ab-chapter {
  scroll-margin-top: 110px;
  padding-bottom: 46px;
}

.page-about .ab-chapter--last {
  padding-bottom: 12px;
}

.page-about .ab-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-top: var(--gs-edge);
  padding-top: 18px;
  margin-bottom: 20px;
}

.page-about .ab-chapter__num {
  font-family: var(--gs-font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gs-cyan);
  flex: 0 0 auto;
}

.page-about .ab-chapter__text {
  max-width: var(--ab-measure);
  color: var(--gs-silver);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .ab-chapter__text p {
  margin: 0 0 18px;
}

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

.page-about .ab-chapter__text strong {
  color: var(--gs-white);
  font-weight: 700;
}

.page-about .ab-chapter__text a {
  color: var(--gs-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 212, .42);
  transition: border-color 120ms var(--gs-ease);
}

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

.page-about .ab-chapter__text--after {
  margin-top: 24px;
}

/* ---------- 暖纸面板 ---------- */
.page-about .ab-paper {
  background: var(--gs-paper);
  color: var(--gs-paper-ink);
  border-radius: var(--gs-radius);
  padding: 24px 20px;
  margin: 0 0 46px;
  box-shadow: var(--gs-shadow);
}

.page-about .ab-paper__kicker {
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gs-violet);
  margin: 0 0 10px;
}

.page-about .ab-paper__title {
  font-family: var(--gs-font-head);
  font-size: 22px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--gs-paper-ink);
  margin: 0 0 20px;
}

.page-about .ab-paper__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-paper__list li {
  border-top: 1px solid var(--ab-paper-line);
  padding-top: 14px;
}

.page-about .ab-paper__idx {
  display: inline-block;
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gs-orange);
  margin-bottom: 6px;
}

.page-about .ab-paper h4 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--gs-paper-ink);
}

.page-about .ab-paper p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-paper-soft);
}

.page-about .ab-paper__foot {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--ab-paper-line);
}

.page-about .ab-paper__foot a {
  color: var(--gs-paper-ink);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid rgba(124, 92, 255, .55);
}

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

/* ---------- 四类内容块 ---------- */
.page-about .ab-kinds {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .ab-kind {
  position: relative;
  border: var(--gs-edge);
  border-radius: 12px;
  background: var(--gs-ink);
  padding: 18px;
  overflow: hidden;
  transition: border-color 120ms var(--gs-ease), transform 200ms var(--gs-ease);
}

.page-about .ab-kind::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  opacity: .9;
}

.page-about .ab-kind:hover {
  transform: translateY(-2px);
}

.page-about .ab-kind--cyan { color: var(--gs-cyan); border-color: rgba(33, 230, 212, .34); }
.page-about .ab-kind--violet { color: var(--gs-violet); border-color: rgba(124, 92, 255, .34); }
.page-about .ab-kind--orange { color: var(--gs-orange); border-color: rgba(255, 122, 47, .34); }
.page-about .ab-kind--silver { color: var(--gs-silver); border-color: var(--gs-line); }

.page-about .ab-kind__no {
  display: block;
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  margin-bottom: 10px;
}

.page-about .ab-kind h3 {
  font-family: var(--gs-font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--gs-white);
  margin: 0 0 8px;
}

.page-about .ab-kind p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gs-silver);
}

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

.page-about .ab-figure {
  margin: 0;
  border: var(--gs-edge);
  border-radius: 12px;
  overflow: hidden;
  background: var(--gs-ink);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .ab-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gs-silver);
  border-top: var(--gs-edge);
}

/* ---------- 赛季时间带 ---------- */
.page-about .ab-season {
  margin: 0 0 46px;
  border: var(--gs-edge);
  border-radius: var(--gs-radius);
  background: var(--gs-ink);
  overflow: hidden;
  box-shadow: var(--gs-shadow);
}

.page-about .ab-season__media {
  position: relative;
  background: linear-gradient(120deg, var(--gs-void), var(--gs-stand));
}

.page-about .ab-season__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 8 / 3;
  filter: brightness(.78) saturate(.85);
}

.page-about .ab-season__cap {
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gs-silver);
  padding: 12px 18px 0;
}

.page-about .ab-season__rail {
  display: grid;
  border-top: var(--gs-edge);
  margin-top: 12px;
}

.page-about .ab-stage {
  padding: 20px 18px;
  border-top: 1px solid var(--gs-line);
  outline: none;
  transition: background-color 160ms var(--gs-ease);
}

.page-about .ab-stage:first-child {
  border-top: none;
}

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

.page-about .ab-stage__key {
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  margin: 0 0 8px;
  color: var(--gs-silver);
}

.page-about .ab-stage__name {
  font-family: var(--gs-font-head);
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  color: var(--gs-white);
}

.page-about .ab-stage__desc {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--gs-silver);
  max-height: 220px;
  opacity: 1;
  overflow: hidden;
  transition: max-height 240ms var(--gs-ease), opacity 200ms var(--gs-ease);
}

.page-about .ab-stage--cyan .ab-stage__key { color: var(--gs-cyan); }
.page-about .ab-stage--violet .ab-stage__key { color: var(--gs-violet); }
.page-about .ab-stage--orange .ab-stage__key { color: var(--gs-orange); }

.page-about .ab-stage--cyan:hover { background: rgba(33, 230, 212, .06); }
.page-about .ab-stage--violet:hover { background: rgba(124, 92, 255, .07); }
.page-about .ab-stage--orange:hover { background: rgba(255, 122, 47, .07); }

/* ---------- 场景面板 ---------- */
.page-about .ab-scenes {
  display: grid;
  gap: 18px;
}

.page-about .ab-scene {
  border-top: 1px solid var(--ab-paper-line);
  padding-top: 14px;
}

.page-about .ab-scene h4 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--gs-paper-ink);
}

.page-about .ab-scene p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-paper-soft);
}

/* ---------- 资质与联络 ---------- */
.page-about .ab-contact {
  margin: 24px 0 0;
  border-top: var(--gs-edge);
  max-width: var(--ab-measure);
}

.page-about .ab-contact__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: var(--gs-edge);
}

.page-about .ab-contact__row dt {
  font-family: var(--gs-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gs-silver);
}

.page-about .ab-contact__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--gs-white);
  word-break: break-word;
}

.page-about .ab-contact__row dd a {
  color: var(--gs-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(33, 230, 212, .42);
}

.page-about .ab-contact__row dd a:hover,
.page-about .ab-contact__row dd a:focus-visible {
  border-bottom-color: var(--gs-cyan);
}

/* ---------- 响应式 ---------- */
@media (hover: hover) and (min-width: 768px) {
  .page-about .ab-stage__desc {
    max-height: 0;
    opacity: 0;
  }

  .page-about .ab-stage:hover .ab-stage__desc,
  .page-about .ab-stage:focus-within .ab-stage__desc,
  .page-about .ab-stage:focus .ab-stage__desc {
    max-height: 220px;
    opacity: 1;
  }
}

@media (min-width: 640px) {
  .page-about .ab-kinds {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-paper {
    padding: 32px 30px;
  }

  .page-about .ab-contact__row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding-top: 104px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: end;
    gap: 32px;
    padding: 32px;
  }

  .page-about .ab-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .ab-stage {
    border-top: none;
    border-left: 1px solid var(--gs-line);
  }

  .page-about .ab-stage:first-child {
    border-left: none;
  }

  .page-about .ab-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 60px;
    padding: 56px 0 96px;
  }

  .page-about .ab-index {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-index__link {
    border: none;
    border-left: 2px solid var(--gs-line);
    border-radius: 0;
    background: transparent;
    padding: 6px 0 6px 12px;
    font-size: 14px;
  }

  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible {
    border-left-color: var(--gs-cyan);
    background: transparent;
  }

  .page-about .ab-chapter {
    padding-bottom: 56px;
  }

  .page-about .ab-paper {
    margin-bottom: 56px;
  }

  .page-about .ab-season {
    margin-bottom: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-kind,
  .page-about .ab-stage,
  .page-about .ab-stage__desc,
  .page-about .ab-index__link {
    transition: none;
  }

  .page-about .ab-kind:hover {
    transform: none;
  }
}