.page-about {
  --ab-line: rgba(30, 91, 69, 0.6);
  --ab-line-soft: rgba(30, 91, 69, 0.28);
  --ab-amber-soft: rgba(255, 177, 59, 0.07);
}

/* 面包屑与顶部 */
.page-about .ab-top {
  padding-top: clamp(14px, 3vw, 26px);
  padding-bottom: clamp(10px, 2vw, 18px);
}
.page-about .ab-crumbs__sep {
  color: var(--grid);
  margin: 0 4px;
}

/* 章节通用 */
.page-about .ab-sec {
  border-top: 1px solid var(--ab-line-soft);
}
.page-about .ab-head {
  max-width: 66ch;
  margin-bottom: clamp(20px, 3.4vw, 38px);
}
.page-about .ab-head .lead {
  margin-top: 10px;
  color: var(--paper-dim);
  line-height: 1.85;
}

/* 首屏 */
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(14px, 3vw, 22px);
}
@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: clamp(28px, 5vw, 72px);
    align-items: end;
  }
}
.page-about .ab-hero h1 {
  margin: 0.24em 0 0;
  font-size: clamp(38px, 8.6vw, 72px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.022em;
  color: var(--paper);
}
.page-about .ab-hero__body p {
  margin: 0 0 14px;
  max-width: 36em;
  color: var(--paper-dim);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}
.page-about .ab-hero__body p:last-child {
  margin-bottom: 0;
}
.page-about .ab-hero__body .lead {
  color: var(--paper);
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.8;
}

.page-about .ab-facts {
  display: grid;
  gap: 1px;
  margin: clamp(26px, 4.4vw, 48px) 0 0;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line);
}
@media (min-width: 820px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .ab-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  background: var(--ink);
}
.page-about .ab-facts dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .ab-facts dd {
  margin: 0;
  font-size: 14px;
  color: var(--paper);
}

/* 三口径方法 */
.page-about .ab-method__fig {
  margin: 0 0 clamp(20px, 3vw, 34px);
  border: 1px solid var(--ab-line);
}
.page-about .ab-method__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}
.page-about .ab-method__fig .media__cap {
  display: block;
  padding: 10px 14px;
  background: var(--panel);
  border-top: 1px solid var(--ab-line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

.page-about .ab-axes {
  display: grid;
  gap: 14px;
}
.page-about .ab-axis {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
  border-left: 3px solid var(--muted);
  transition: transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}
.page-about .ab-axis[data-axis="stoppage"] {
  border-left-color: var(--brick);
}
.page-about .ab-axis[data-axis="rounds"] {
  border-left-color: var(--neon);
}
.page-about .ab-axis[data-axis="youth"] {
  border-left-color: var(--amber);
}
.page-about .ab-axis:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px var(--grid) inset;
}
.page-about .ab-axis__tag {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-transform: uppercase;
}
.page-about .ab-axis h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 900;
  color: var(--paper);
}
.page-about .ab-axis p {
  margin: 0 0 10px;
  color: var(--paper-dim);
  font-size: 15px;
  line-height: 1.82;
}
.page-about .ab-axis__foot {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-top: 1px solid var(--ab-line-soft);
  padding-top: 10px;
}

@media (min-width: 900px) {
  .page-about .ab-axes {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
  .page-about .ab-axis[data-axis="stoppage"] {
    grid-column: 1 / 6;
    grid-row: 1;
  }
  .page-about .ab-axis[data-axis="rounds"] {
    grid-column: 7 / 13;
    grid-row: 1;
    margin-top: 40px;
  }
  .page-about .ab-axis[data-axis="youth"] {
    grid-column: 3 / 9;
    grid-row: 2;
  }
}

/* 时间轴 */
.page-about .ab-tl {
  position: relative;
  border: 1px solid var(--ab-line);
  background: var(--ink-deep);
  overflow: hidden;
}
.page-about .ab-tl__bg {
  position: absolute;
  inset: 0;
  opacity: 0.2;
  pointer-events: none;
}
.page-about .ab-tl__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .ab-tl__track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 34px 0 26px clamp(18px, 3vw, 34px);
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 1fr);
  overflow-x: auto;
  overscroll-behavior-x: contain;
}
.page-about .ab-tl__node {
  position: relative;
  padding: 0 clamp(16px, 2.4vw, 30px) 0 0;
  border-top: 1px solid var(--grid);
  padding-top: 22px;
  margin-right: clamp(14px, 2vw, 26px);
}
.page-about .ab-tl__node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--ink-deep);
  border: 2px solid var(--neon);
  transform: rotate(45deg);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.page-about .ab-tl__node:hover::before,
.page-about .ab-tl__node:focus-within::before {
  background: var(--neon);
  box-shadow: 0 0 12px var(--glow);
}
.page-about .ab-tl__stage {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}
.page-about .ab-tl__year {
  display: block;
  margin: 0 0 10px;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-about .ab-tl__text {
  margin: 0 0 12px;
  max-width: 30ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-dim);
}
.page-about .ab-tl__meta {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
  transition: color 0.25s var(--ease);
}
.page-about .ab-tl__node:hover .ab-tl__meta {
  color: var(--paper);
}

/* 梯队轴 */
.page-about .ab-ladder__grid {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}
@media (min-width: 900px) {
  .page-about .ab-ladder__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(26px, 4vw, 56px);
    align-items: start;
  }
}
.page-about .ab-ladder__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .ab-rung {
  background: linear-gradient(90deg, var(--ab-amber-soft), transparent 62%);
  border-left: 2px solid var(--amber);
}
.page-about .ab-rung summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 12px 16px;
}
.page-about .ab-rung summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-rung summary::marker {
  content: "";
}
.page-about .ab-rung__code {
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.03em;
  line-height: 1;
}
.page-about .ab-rung--u19 .ab-rung__code {
  font-size: clamp(30px, 7vw, 52px);
}
.page-about .ab-rung--u17 .ab-rung__code {
  font-size: clamp(26px, 6vw, 44px);
}
.page-about .ab-rung--u16 .ab-rung__code {
  font-size: clamp(22px, 5vw, 36px);
}
.page-about .ab-rung--u15 .ab-rung__code {
  font-size: clamp(19px, 4.2vw, 30px);
}
.page-about .ab-rung__label {
  font-size: 13px;
  color: var(--muted);
}
.page-about .ab-rung p {
  margin: 0;
  padding: 0 16px 16px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper-dim);
}

.page-about .ab-ladder__note {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
  border-top: 3px solid var(--amber);
}
.page-about .ab-ladder__note h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 900;
  color: var(--paper);
}
.page-about .ab-ladder__note p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper-dim);
}
.page-about .ab-ladder__keys {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-line-soft);
}
.page-about .ab-ladder__keys li {
  padding: 10px 0;
  border-bottom: 1px solid var(--ab-line-soft);
  font-size: 13px;
  color: var(--paper-dim);
}
.page-about .ab-ladder__keys .mono {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

/* 主场地图 */
.page-about .ab-map__intro {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}
@media (min-width: 820px) {
  .page-about .ab-map__intro {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 44px);
  }
}
.page-about .ab-map__intro p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-dim);
}
.page-about .ab-map__intro a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
}
.page-about .ab-map__intro a:hover {
  color: var(--glow);
  border-bottom-color: var(--neon);
}

.page-about .ab-dots {
  position: relative;
  min-height: 168px;
  border: 1px solid var(--ab-line);
  background-color: var(--ink-deep);
  background-image: radial-gradient(circle, var(--grid) 1.3px, transparent 1.6px);
  background-size: 22px 22px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 4px;
  padding: clamp(16px, 3vw, 26px);
  margin-bottom: clamp(16px, 2.6vw, 24px);
}
.page-about .ab-dots__num {
  font-size: clamp(46px, 12vw, 96px);
  font-weight: 700;
  line-height: 0.9;
  color: rgba(0, 229, 195, 0.9);
  letter-spacing: -0.03em;
}
.page-about .ab-dots__cap {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ab-leagues {
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line);
}
@media (min-width: 820px) {
  .page-about .ab-leagues {
    grid-template-columns: 1.2fr 1fr 1fr;
  }
}
.page-about .ab-league {
  background: var(--ink);
  padding: clamp(16px, 2.4vw, 22px);
}
.page-about .ab-league__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ab-line-soft);
}
.page-about .ab-league__name {
  font-size: 17px;
  font-weight: 900;
  color: var(--paper);
}
.page-about .ab-league__count {
  font-size: 22px;
  font-weight: 700;
  color: var(--neon);
}
.page-about .ab-league p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .ab-map__fig {
  margin: 0;
  border: 1px solid var(--ab-line);
}
.page-about .ab-map__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-map__fig .media__cap {
  display: block;
  padding: 10px 14px;
  background: var(--panel);
  border-top: 1px solid var(--ab-line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
}

/* 团队 */
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
}
@media (min-width: 900px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.6fr);
    align-items: start;
  }
}
.page-about .ab-team__lead {
  padding: clamp(20px, 3vw, 28px);
  background: var(--panel);
  border-bottom: 3px solid var(--neon);
}
.page-about .ab-team__num {
  margin: 0;
  font-size: clamp(52px, 10vw, 88px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--neon);
  letter-spacing: -0.03em;
}
.page-about .ab-team__cap {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line);
}
@media (min-width: 760px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-role {
  background: var(--ink);
  padding: clamp(16px, 2.4vw, 22px);
}
.page-about .ab-role__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--amber);
}
.page-about .ab-role h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 900;
  color: var(--paper);
}
.page-about .ab-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
}
.page-about .ab-team__note {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--brick);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* 版本与节奏 */
.page-about .ab-stats {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line);
}
@media (min-width: 760px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .ab-stats li {
  background: var(--ink);
  padding: clamp(14px, 2.2vw, 20px);
  display: grid;
  gap: 6px;
}
.page-about .ab-stats__n {
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  color: var(--neon);
  letter-spacing: -0.02em;
}
.page-about .ab-stats__l {
  font-size: 13px;
  color: var(--muted);
}

.page-about .ab-ops__grid {
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
}
@media (min-width: 820px) {
  .page-about .ab-ops__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .ab-ops__grid h3 {
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ab-line);
  font-size: 16px;
  font-weight: 900;
  color: var(--paper);
}
.page-about .ab-ops__grid p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper-dim);
}
.page-about .ab-ops__links {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-line-soft);
  font-size: 14px;
  line-height: 2;
  color: var(--muted);
}
.page-about .ab-ops__links a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
}
.page-about .ab-ops__links a:hover {
  color: var(--glow);
  border-bottom-color: var(--neon);
}

/* 资质与联系 */
.page-about .ab-legal__grid {
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line);
}
@media (min-width: 820px) {
  .page-about .ab-legal__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-legal__box {
  background: var(--panel);
  padding: clamp(18px, 2.6vw, 26px);
}
.page-about .ab-legal__cap {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}
.page-about .ab-legal__val {
  margin: 0 0 10px;
  font-size: 16px;
  color: var(--paper);
  word-break: break-word;
}
.page-about .ab-legal__box p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--paper-dim);
}
.page-about .ab-legal__more {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
}
.page-about .ab-legal__more a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
  font-size: 14px;
}
.page-about .ab-legal__more a:hover {
  color: var(--glow);
  border-bottom-color: var(--neon);
}
.page-about .ab-legal__more .btn {
  border-bottom: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-axis,
  .page-about .ab-tl__node::before,
  .page-about .ab-tl__meta {
    transition: none;
  }
  .page-about .ab-axis:hover {
    transform: none;
  }
}