.page-about{
  --ab-hair: rgba(199, 214, 232, 0.16);
  --ab-hair-cy: rgba(63, 208, 212, 0.36);
  background: var(--night);
  color: var(--mist);
}

.page-about h2,
.page-about h3{
  font-family: var(--font-display);
  letter-spacing: -0.015em;
}

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

/* ---------- 通用标题组 ---------- */
.page-about .ab-kicker{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 0.18rem 0.5rem;
  border: 2px solid var(--edge);
  border-radius: 2px;
  background: var(--yellow);
  color: var(--night);
}

.page-about .ab-title{
  margin: 0.85rem 0 0.65rem;
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  font-weight: 900;
  line-height: 1.16;
}

.page-about .ab-lead{
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.85;
  opacity: 0.92;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero{
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 3.5vw, 2.25rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(130% 100% at 8% -10%, rgba(63, 208, 212, 0.16), transparent 55%),
    radial-gradient(90% 90% at 96% 0%, rgba(255, 122, 26, 0.12), transparent 58%),
    var(--night);
  border-bottom: 2px solid var(--edge);
}

.page-about .ab-hero::before{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ab-hair) 1px, transparent 1px),
    linear-gradient(90deg, var(--ab-hair) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(120% 82% at 18% 0%, #000 8%, transparent 72%);
  mask-image: radial-gradient(120% 82% at 18% 0%, #000 8%, transparent 72%);
  pointer-events: none;
}

.page-about .ab-crumbs{
  position: relative;
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .ab-hero-grid{
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .ab-eyebrow{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.page-about .ab-eyebrow .meta-code{
  color: var(--mist-dim);
}

.page-about .ab-hero h1{
  margin: 0.9rem 0 1.1rem;
  font-size: clamp(2.1rem, 7vw, 4rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .ab-hero-lead{
  max-width: 36em;
  font-size: clamp(1rem, 2.4vw, 1.1rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-hero-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .ab-route{
  padding: 1.25rem 1.15rem 1.4rem;
}

.page-about .ab-route-kicker{
  color: var(--cyan);
}

.page-about .ab-route-title{
  margin: 0.45rem 0 1rem;
  font-size: clamp(1.15rem, 3vw, 1.4rem);
  font-weight: 800;
  color: var(--snow);
}

.page-about .ab-route-list{
  display: grid;
  gap: 0.9rem;
}

.page-about .ab-route-list li{
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.7rem;
  align-items: start;
}

.page-about .ab-route-num{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  padding: 0.08rem 0.36rem;
  border: 2px solid var(--edge);
  border-radius: 2px;
  background: var(--cyan);
  color: var(--night);
}

.page-about .ab-route-list p{
  font-size: 0.925rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 缘起 ---------- */
.page-about .ab-origin{
  background: var(--snow);
  color: var(--ink);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.page-about .ab-origin-grid{
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .ab-origin-title{
  margin-top: 0.8rem;
  max-width: 13em;
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  font-weight: 900;
  line-height: 1.15;
}

.page-about .ab-prose p{
  font-size: 1.02rem;
  line-height: 1.95;
  max-width: 40em;
}

.page-about .ab-prose p + p{
  margin-top: 1.1rem;
}

/* ---------- 四条联赛线 ---------- */
.page-about .ab-leagues{
  background: var(--night-deep);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.page-about .ab-leagues-top{
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-league-figure{
  margin: 0;
}

.page-about .ab-league-list{
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .ab-league{
  position: relative;
  padding: 1.15rem 1.05rem 1.2rem;
  background: var(--board);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .ab-league:hover,
.page-about .ab-league:focus-within{
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow);
  border-color: var(--ab-hair-cy);
}

.page-about .ab-league-name{
  margin: 0.7rem 0 0.45rem;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--snow);
}

.page-about .ab-league-desc{
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-league-meta{
  margin-top: 0.85rem;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--ab-hair);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--mist-dim);
  transition: color 0.22s var(--ease);
}

.page-about .ab-league:hover .ab-league-meta,
.page-about .ab-league:focus-within .ab-league-meta{
  color: var(--cyan);
}

/* ---------- 伤停流程 ---------- */
.page-about .ab-flow{
  background: var(--snow);
  color: var(--ink);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.page-about .ab-flow-figure{
  margin: 1.75rem 0 0;
}

.page-about .ab-steps{
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .ab-step{
  position: relative;
  padding: 1.1rem 1rem 1.2rem;
  background: #ffffff;
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.page-about .ab-step-num{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.08rem 0.4rem;
  border: 2px solid var(--edge);
  border-radius: 2px;
  background: var(--board);
  color: var(--snow);
}

.page-about .ab-step h3{
  margin: 0.62rem 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-step p{
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.86;
}

.page-about .ab-flow-note{
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  padding: 1.25rem 1.1rem 1.35rem;
  background: rgba(18, 41, 74, 0.06);
  border: 2px solid var(--edge);
  border-left: 4px solid var(--cyan);
  border-radius: var(--radius);
}

.page-about .ab-flow-note-title{
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.68;
}

.page-about .ab-flow-note .list-line{
  color: var(--ink);
}

.page-about .ab-flow-note-link{
  margin-top: 1rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .ab-flow-note-link a{
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
}

/* ---------- 历程 ---------- */
.page-about .ab-timeline-section{
  background: var(--night);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.page-about .ab-timeline{
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .ab-rail-list{
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scrollbar-width: none;
}

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

.page-about .ab-rail-node{
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mist-dim);
  background: var(--board);
  border: 2px solid var(--edge);
  border-radius: 2px;
  transition: color 0.22s var(--ease);
}

.page-about .ab-rail-node::before{
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--yellow);
  border: 2px solid var(--edge);
  transition: background 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

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

.page-about .ab-rail-node:hover::before,
.page-about .ab-rail-node:focus-visible::before{
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(63, 208, 212, 0.22), 0 0 14px rgba(63, 208, 212, 0.55);
}

.page-about .ab-years{
  display: grid;
  gap: 1.25rem;
}

.page-about .ab-year{
  padding: 1.25rem 1.1rem 1.35rem;
  background: var(--board);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 110px;
}

.page-about .ab-year-num{
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .ab-year h3{
  margin: 0.62rem 0 0.5rem;
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  font-weight: 800;
  color: var(--snow);
}

.page-about .ab-year p{
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-time-figure{
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
}

/* ---------- 团队与合作 ---------- */
.page-about .ab-team{
  background: var(--snow);
  color: var(--ink);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}

.page-about .ab-team-grid{
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-team-col{
  padding: 1.3rem 1.15rem 1.45rem;
  background: #ffffff;
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.page-about .ab-team-col h3{
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.66;
}

.page-about .ab-team-list{
  display: grid;
  gap: 0.95rem;
  margin-top: 1rem;
}

.page-about .ab-team-list li{
  display: grid;
  gap: 0.22rem;
}

.page-about .ab-team-k{
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--night);
}

.page-about .ab-team-v{
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.86;
}

/* ---------- 数据带 ---------- */
.page-about .ab-stats{
  background: var(--night-deep);
  border-top: 2px solid var(--edge);
  padding: clamp(2.25rem, 5vw, 3.5rem) 0;
}

.page-about .ab-stats-title{
  margin-bottom: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist-dim);
}

.page-about .ab-stat-list{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.page-about .ab-stat{
  padding-left: 0.9rem;
  border-left: 3px solid var(--cyan);
}

.page-about .ab-stat-num{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 4.2vw, 2.1rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--snow);
}

.page-about .ab-stat-label{
  display: block;
  margin-top: 0.4rem;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--mist-dim);
}

/* ---------- 结尾入口 ---------- */
.page-about .ab-cta{
  background:
    radial-gradient(95% 140% at 100% 0%, rgba(255, 122, 26, 0.22), transparent 62%),
    var(--night);
  border-top: 2px solid var(--edge);
  padding: clamp(2.25rem, 5vw, 3.5rem) 0;
}

.page-about .ab-cta-inner{
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-cta h2{
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--snow);
}

.page-about .ab-cta p{
  margin-top: 0.6rem;
  max-width: 40em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-cta-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px){
  .page-about .ab-league-list{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-steps{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px){
  .page-about .ab-team-grid{
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }
  .page-about .ab-cta-inner{
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2.5rem;
  }
  .page-about .ab-stat-list{
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

@media (min-width: 900px){
  .page-about .ab-hero-grid{
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
    gap: clamp(2.5rem, 5vw, 4rem);
  }
  .page-about .ab-origin-grid{
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 4rem);
  }
  .page-about .ab-leagues-top{
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: center;
    gap: 2.5rem;
  }
  .page-about .ab-timeline{
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }
  .page-about .ab-rail{
    position: sticky;
    top: 96px;
  }
  .page-about .ab-rail-list{
    flex-direction: column;
    gap: 0.55rem;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .ab-rail-node{
    width: 100%;
    background: transparent;
    border-color: transparent;
    padding: 0.4rem 0.2rem;
  }
}

@media (min-width: 1024px){
  .page-about .ab-steps{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-step:not(:last-child)::after{
    content: "";
    position: absolute;
    top: 2.35rem;
    right: -1rem;
    width: 1rem;
    height: 2px;
    background: var(--cyan);
  }
}

@media (min-width: 1080px){
  .page-about .ab-league-list{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .ab-league,
  .page-about .ab-league-meta,
  .page-about .ab-rail-node,
  .page-about .ab-rail-node::before{
    transition: none;
  }
  .page-about .ab-league:hover,
  .page-about .ab-league:focus-within{
    transform: none;
  }
}