.page-about {
  --ab-radius: 3px;
  background: var(--night);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .ab-crumb-now {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .ab-hero__eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 38em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-facts__item {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.page-about .ab-facts__num {
  font-size: clamp(19px, 2.2vw, 25px);
  font-weight: 700;
  color: var(--mint);
  letter-spacing: -0.01em;
}

.page-about .ab-facts__label {
  font-size: 12px;
  color: var(--muted-deep);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* 首屏纯 CSS 视觉：赛季读秒环 */
.page-about .ab-hero__visual {
  display: grid;
  place-items: center;
}

.page-about .ab-dial {
  position: relative;
  width: min(100%, 380px);
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
}

.page-about .ab-dial__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from -90deg,
    var(--grass) 0deg 74deg,
    transparent 74deg 80deg,
    var(--gold) 80deg 104deg,
    transparent 104deg 112deg,
    var(--grass) 112deg 208deg,
    transparent 208deg 214deg,
    var(--stoppage) 214deg 236deg,
    transparent 236deg 244deg,
    var(--grass) 244deg 344deg,
    transparent 344deg 360deg
  );
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 22px), #000 calc(100% - 21px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 22px), #000 calc(100% - 21px));
  opacity: 0.9;
}

.page-about .ab-dial__ring--inner {
  inset: 16%;
  opacity: 0.4;
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 6px), #000 calc(100% - 5px));
}

.page-about .ab-dial__core {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 6px;
  text-align: center;
}

.page-about .ab-dial__num {
  font-size: clamp(44px, 9vw, 72px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.03em;
}

.page-about .ab-dial__cap {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ab-dial__badge {
  position: absolute;
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--glass-strong);
  border: 1px solid var(--line);
  color: var(--ink);
}

.page-about .ab-dial__badge--gold {
  top: 6%;
  right: 0;
  color: var(--gold);
  border-color: rgba(227, 179, 65, 0.45);
}

.page-about .ab-dial__badge--stoppage {
  bottom: 8%;
  left: 0;
  color: var(--stoppage);
  border-color: rgba(224, 75, 42, 0.45);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-band {
  padding-block: clamp(48px, 8vw, 92px);
}

.page-about .ab-band--paper {
  background: var(--paper);
  color: var(--ink-on-paper);
  --muted: #55676F;
  --muted-deep: #6B7C84;
  --line: #D4CBB6;
}

.page-about .ab-band--pitch {
  background: linear-gradient(180deg, var(--night-deep) 0%, var(--pitch) 100%);
}

.page-about .section-head {
  margin-bottom: clamp(24px, 3.5vw, 40px);
}

.page-about .section-head__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--mint);
  margin-bottom: 10px;
}

.page-about .ab-band--paper .section-head__no {
  color: var(--grass);
}

.page-about .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .section-head__lede {
  margin: 14px 0 0;
  max-width: 44em;
  font-size: clamp(14px, 1.35vw, 16px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .prose {
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .prose p {
  margin: 0 0 16px;
}

.page-about .prose strong {
  color: var(--ink);
  font-weight: 700;
  box-shadow: inset 0 -0.5em 0 rgba(227, 179, 65, 0.18);
}

.page-about .ab-band--paper .prose strong,
.page-about .ab-band--paper .ab-coop__lead strong,
.page-about .ab-band--paper .ab-coop__sub strong {
  color: var(--ink-on-paper);
  box-shadow: inset 0 -0.5em 0 rgba(30, 122, 87, 0.16);
}

.page-about .ab-inline-link {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 192, 138, 0.5);
  padding-bottom: 1px;
}

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

/* ---------- 01 档案起点 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

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

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--ab-radius);
}

.page-about .media-frame__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted-deep);
}

/* ---------- 02 横向时间轴 ---------- */
.page-about .ab-band--rail {
  background:
    radial-gradient(1100px 380px at 12% -10%, rgba(30, 122, 87, 0.28), transparent 70%),
    var(--night);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .ab-rail {
  overflow-x: auto;
  overflow-y: hidden;
  margin-top: clamp(8px, 2vw, 24px);
  padding-bottom: 12px;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .ab-rail::-webkit-scrollbar {
  height: 6px;
}

.page-about .ab-rail::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 999px;
}

.page-about .ab-rail__inner {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: clamp(22px, 4.6vw, 60px);
  min-width: max-content;
  padding: 74px clamp(18px, 3vw, 34px) 30px;
}

.page-about .ab-rail__inner::before {
  content: "";
  position: absolute;
  left: clamp(18px, 3vw, 34px);
  right: clamp(18px, 3vw, 34px);
  bottom: 39px;
  height: 2px;
  background: linear-gradient(90deg, var(--line), var(--grass) 40%, var(--gold) 74%, var(--stoppage));
  opacity: 0.75;
}

.page-about .ab-node {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  min-width: 62px;
  padding: 0;
  text-decoration: none;
  scroll-snap-align: center;
  outline-offset: 6px;
}

.page-about .ab-node__year {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.18s ease;
}

.page-about .ab-node__mark {
  display: grid;
  place-items: center;
  height: 20px;
  width: 20px;
}

.page-about .ab-node__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--pitch);
  border: 2px solid var(--grass);
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-about .ab-node--sm .ab-node__dot {
  width: 7px;
  height: 7px;
  border-width: 1px;
}

.page-about .ab-node--lg .ab-node__dot {
  width: 17px;
  height: 17px;
  border-color: var(--gold);
}

.page-about .ab-node__tip {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  width: max-content;
  max-width: 210px;
  padding: 9px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--glass-strong);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.page-about .ab-node:hover .ab-node__tip,
.page-about .ab-node:focus-visible .ab-node__tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .ab-node:hover .ab-node__dot,
.page-about .ab-node:focus-visible .ab-node__dot {
  background: var(--mint);
  border-color: var(--mint);
  transform: scale(1.15);
}

.page-about .ab-node:hover .ab-node__year,
.page-about .ab-node:focus-visible .ab-node__year {
  color: var(--ink);
}

/* 阶段区块 */
.page-about .ab-eras {
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .ab-era {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding-block: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .ab-era:target {
  border-top-color: var(--mint);
}

.page-about .ab-era__year {
  display: block;
  font-size: clamp(34px, 6vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--grass);
}

.page-about .ab-era:target .ab-era__year {
  color: var(--gold);
}

.page-about .ab-era__name {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .ab-era__body p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

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

/* ---------- 03 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-team__chart {
  display: grid;
  justify-items: center;
  gap: 16px;
  padding: 26px 20px;
  background: rgba(13, 29, 40, 0.04);
  border: 1px solid var(--line);
  border-top: 3px solid var(--grass);
  border-radius: var(--ab-radius);
}

.page-about .ab-donut {
  width: min(100%, 240px);
  height: auto;
}

.page-about .ab-donut__base {
  stroke: #E2DAC7;
}

.page-about .ab-donut__seg--grass {
  stroke: var(--grass);
}

.page-about .ab-donut__seg--gold {
  stroke: var(--gold);
}

.page-about .ab-donut__mid {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  fill: var(--ink-on-paper);
}

.page-about .ab-donut__sub {
  font-size: 11px;
  letter-spacing: 0.12em;
  fill: #6B7C84;
}

.page-about .ab-legend {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-legend__item {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  color: #3D515A;
}

.page-about .ab-legend__key {
  width: 14px;
  height: 8px;
  border-radius: 1px;
  flex: 0 0 auto;
}

.page-about .ab-legend__key--grass {
  background: var(--grass);
}

.page-about .ab-legend__key--gold {
  background: var(--gold);
}

.page-about .ab-roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-role {
  display: grid;
  grid-template-columns: 34px 1fr;
  grid-template-rows: auto auto;
  column-gap: 14px;
  row-gap: 6px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-role__no {
  grid-row: 1 / span 2;
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  padding-top: 3px;
}

.page-about .ab-role__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-on-paper);
}

.page-about .ab-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #45585F;
}

.page-about .ab-team__media {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

/* ---------- 04 复核流程 ---------- */
.page-about .ab-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: ab-step;
}

.page-about .ab-step {
  position: relative;
  padding: 20px 18px 20px 22px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--grass);
  border-radius: var(--ab-radius);
  transition: transform 0.18s ease, background 0.18s ease;
}

.page-about .ab-step:hover {
  transform: translateY(-2px);
  background: var(--glass-strong);
}

.page-about .ab-step__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mint);
  margin-bottom: 10px;
}

.page-about .ab-step__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-step__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 05 版本迭代 ---------- */
.page-about .ab-vers {
  border-top: 1px solid var(--line);
}

.page-about .ab-ver {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-ver__sum {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-ver__sum:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

.page-about .ab-ver__tag {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .ab-ver__name {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-ver__hint {
  flex: 0 0 auto;
  font-size: 12px;
  color: var(--muted-deep);
}

.page-about .ab-ver[open] .ab-ver__hint {
  color: var(--mint);
}

.page-about .ab-ver__body {
  padding: 0 4px 20px 4px;
}

.page-about .ab-ver__body p {
  margin: 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-vers__foot {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 06 合作生态 ---------- */
.page-about .ab-coop {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-coop__lead,
.page-about .ab-coop__sub {
  margin: 0 0 14px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-coop__lead strong,
.page-about .ab-coop__sub strong {
  color: var(--ink);
  font-weight: 700;
}

.page-about .ab-coop__stats {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 3px solid var(--gold);
}

.page-about .ab-stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 2px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-stat__num {
  min-width: 66px;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.page-about .ab-stat__label {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 07 后续规划 ---------- */
.page-about .ab-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-next__item {
  padding: 20px 18px;
  background: linear-gradient(180deg, rgba(16, 51, 58, 0.5), rgba(10, 22, 34, 0.2));
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
}

.page-about .ab-next__tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .ab-next__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-next__foot {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 底部通栏 ---------- */
.page-about .ab-band--banner {
  padding-block: 0 clamp(56px, 8vw, 96px);
}

.page-about .ab-banner {
  margin: 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  background: linear-gradient(135deg, var(--pitch), var(--night-deep));
}

.page-about .ab-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 7;
  opacity: 0.85;
}

.page-about .ab-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-cta__line {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }

  .page-about .ab-split {
    grid-template-columns: 5fr 6fr;
  }

  .page-about .ab-team {
    grid-template-columns: 4fr 7fr;
  }

  .page-about .ab-coop {
    grid-template-columns: 7fr 4fr;
  }

  .page-about .ab-era {
    grid-template-columns: minmax(170px, 230px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 64px);
  }

  .page-about .ab-era__side {
    position: sticky;
    top: 108px;
    align-self: start;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .page-about .ab-rail__inner {
    gap: 20px;
    padding-inline: 14px;
  }

  .page-about .ab-rail__inner::before {
    left: 14px;
    right: 14px;
  }

  .page-about .ab-node__tip {
    max-width: 150px;
    font-size: 11px;
  }

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

  .page-about .ab-role {
    grid-template-columns: 26px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-step,
  .page-about .ab-node__dot,
  .page-about .ab-node__tip,
  .page-about .ab-node__year {
    transition: none;
  }

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