.page-about {
  --ab-rail: 88px;
  --ab-gap: clamp(18px, 3vw, 46px);
  --ab-hair: rgba(0, 229, 255, .45);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 11vw, 148px) 0 clamp(34px, 6vw, 68px);
  background: var(--deep);
}
.page-about .ab-hero__bg {
  position: absolute;
  inset: 0;
}
.page-about .ab-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: saturate(.75) contrast(1.06);
}
.page-about .ab-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(90% 80% at 84% 4%, rgba(124, 77, 255, .34), transparent 62%),
    linear-gradient(180deg, rgba(11, 5, 24, .55) 0%, rgba(26, 11, 46, .88) 58%, var(--night) 100%);
}
.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero .breadcrumb {
  margin-bottom: 22px;
}
.page-about .ab-hero h1 {
  font-family: var(--narrow);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 64px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--ink);
  margin: 16px 0 0;
  max-width: 21ch;
}
.page-about .ab-hero .lede {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
}
.page-about .ab-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}
.page-about .ab-fact__n {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.8vw, 30px);
  color: var(--cyan);
  line-height: 1.15;
}
.page-about .ab-fact__l {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 纵向赛季轨道 ---------- */
.page-about .ab-track {
  padding: clamp(44px, 8vw, 104px) 0 clamp(16px, 3vw, 40px);
}
.page-about .ab-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding-bottom: clamp(46px, 7vw, 92px);
}
.page-about .ab-node__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}
.page-about .ab-node__idx {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan);
  background: var(--deep);
  border: 1px solid var(--ab-hair);
  box-shadow: 0 0 0 7px rgba(11, 5, 24, .92), 0 0 20px rgba(0, 229, 255, .2);
}
.page-about .ab-node__note {
  font-family: var(--narrow);
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--muted);
  text-transform: uppercase;
}
.page-about .ab-node__body {
  max-width: 82ch;
}
.page-about .ab-node__title {
  font-family: var(--narrow);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 38px);
  line-height: 1.24;
  letter-spacing: -.005em;
  color: var(--ink);
  margin: 0 0 16px;
}
.page-about .ab-node__body p {
  color: var(--muted);
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.9;
  margin: 0 0 14px;
}
.page-about .ab-node__body p.lede {
  color: var(--ink);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
}
.page-about .ab-node__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .35);
  transition: border-color .3s var(--ease);
}
.page-about .ab-node__body a:hover,
.page-about .ab-node__body a:focus-visible {
  border-bottom-color: var(--cyan);
}
.page-about .ab-hl {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  padding: 0 2px;
}
.page-about .note {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
  border-left: 2px solid rgba(0, 229, 255, .55);
  padding: 4px 0 4px 14px;
  margin-top: 20px;
}

/* ---------- 通用图文 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  margin-top: 22px;
}
.page-about .ab-figure {
  margin: 0;
}
.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  object-fit: cover;
}
.page-about .ab-figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid rgba(255, 107, 53, .6);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .ab-break {
  margin: 24px 0 clamp(28px, 4vw, 46px);
}

/* ---------- 收录网络示意 ---------- */
.page-about .ab-net {
  margin: 26px 0 0;
}
.page-about .ab-net svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.page-about .ab-net__dot {
  fill: rgba(0, 229, 255, .5);
}
.page-about .ab-net__dot--key {
  fill: var(--orange);
}
.page-about .ab-net__label {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .06em;
}
.page-about .ab-net figcaption {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid rgba(0, 229, 255, .5);
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 赛季节点条 ---------- */
.page-about .ab-season {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-season__item {
  position: relative;
  padding: 16px 0 18px 18px;
  border-left: 1px solid var(--line);
}
.page-about .ab-season__item::before {
  content: "";
  position: absolute;
  top: 22px;
  left: -5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, .7);
}
.page-about .ab-season__item:last-child::before {
  background: var(--orange);
  box-shadow: 0 0 12px rgba(255, 107, 53, .8);
}
.page-about .ab-season__stamp {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}
.page-about .ab-season__item:last-child .ab-season__stamp {
  color: var(--orange);
}
.page-about .ab-season__title {
  font-family: var(--narrow);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink);
  margin: 8px 0 8px;
}
.page-about .ab-season__body {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 工序列表 ---------- */
.page-about .ab-steps {
  list-style: none;
  counter-reset: abstep;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.page-about .ab-steps__item {
  counter-increment: abstep;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-steps__item::before {
  content: counter(abstep, decimal-leading-zero);
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
  padding-top: 3px;
}
.page-about .ab-steps__t {
  display: block;
  margin-bottom: 5px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .02em;
}
.page-about .ab-steps__d {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 岗位带状图 ---------- */
.page-about .ab-band {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 24px 0 22px;
}
.page-about .ab-band__seg {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 16px 18px 18px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: rgba(18, 42, 58, .5);
}
.page-about .ab-band__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1;
  color: var(--ink);
}
.page-about .ab-band__name {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  letter-spacing: .03em;
}
.page-about .ab-band__seg--a { border-color: rgba(0, 229, 255, .45); }
.page-about .ab-band__seg--a .ab-band__num { color: var(--cyan); }
.page-about .ab-band__seg--b { border-color: rgba(124, 77, 255, .5); }
.page-about .ab-band__seg--b .ab-band__num { color: #B39DFF; }
.page-about .ab-band__seg--c { border-color: rgba(155, 176, 201, .32); }

/* ---------- 收尾入口 ---------- */
.page-about .ab-next {
  padding: clamp(40px, 7vw, 92px) 0 clamp(52px, 8vw, 112px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(26, 11, 46, 0) 0%, rgba(11, 5, 24, .75) 100%);
}
.page-about .ab-next__title {
  font-family: var(--narrow);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 36px);
  line-height: 1.25;
  color: var(--ink);
  margin: 12px 0 26px;
}
.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .ab-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(18, 42, 58, .4);
  text-decoration: none;
  transition: border-color .3s var(--ease), background .3s var(--ease), transform .3s var(--ease);
}
.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  border-color: rgba(0, 229, 255, .6);
  background: rgba(0, 229, 255, .07);
  transform: translateY(-2px);
}
.page-about .ab-next__k {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .ab-next__card strong {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .ab-next__card span:last-child {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-next__back {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-next__back a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .4);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-node {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: var(--ab-gap);
  }
  .page-about .ab-node::before {
    content: "";
    position: absolute;
    left: calc(var(--ab-rail) / 2);
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, rgba(0, 229, 255, .5) 0%, rgba(124, 77, 255, .22) 58%, rgba(46, 27, 77, .06) 100%);
  }
  .page-about .ab-node__rail {
    flex-direction: column;
    align-items: center;
    padding-top: 4px;
  }
  .page-about .ab-node__note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .42em;
    margin-top: 18px;
  }
  .page-about .ab-season {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--line);
  }
  .page-about .ab-season__item {
    padding: 24px 20px 26px;
    border-left: 1px solid var(--line);
    border-top: none;
    transition: background .35s var(--ease), border-color .35s var(--ease);
  }
  .page-about .ab-season__item::before {
    top: -5px;
    left: -5px;
  }
  .page-about .ab-season__item:hover {
    background: rgba(0, 229, 255, .055);
    border-color: rgba(0, 229, 255, .5);
  }
  .page-about .ab-season__item:last-child:hover {
    background: rgba(255, 107, 53, .06);
    border-color: rgba(255, 107, 53, .5);
  }
}

@media (min-width: 1000px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .ab-band {
    flex-direction: row;
    gap: 8px;
  }
  .page-about .ab-band__seg--a { flex: 18 1 0; }
  .page-about .ab-band__seg--b { flex: 15 1 0; }
  .page-about .ab-band__seg--c { flex: 13 1 0; }
}

@media (min-width: 860px) {
  .page-about .ab-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .page-about .ab-node__idx {
    box-shadow: 0 0 0 6px rgba(11, 5, 24, .9);
  }
  .page-about .ab-hero {
    padding-top: clamp(56px, 14vw, 96px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-next__card,
  .page-about .ab-next__card:hover,
  .page-about .ab-next__card:focus-visible {
    transform: none;
    transition: none;
  }
}