.page-about {
  --ab-note-w: 120px;
  --ab-squad-accent: var(--neon);
  display: block;
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 96px 0 48px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 78% at 86% 4%, rgba(53, 240, 192, .10) 0%, rgba(53, 240, 192, 0) 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--deep) 100%);
}

.page-about .ab-hero::before,
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1px solid var(--neon);
  opacity: .45;
  pointer-events: none;
}

.page-about .ab-hero::before {
  top: 84px;
  left: 14px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-hero::after {
  bottom: 16px;
  right: 14px;
  border-left: 0;
  border-top: 0;
}

.page-about .ab-hero-inner {
  position: relative;
}

.page-about .ab-hero .eyebrow {
  margin-top: 22px;
}

.page-about .ab-hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 8vw, 72px);
  line-height: 1;
  letter-spacing: -.02em;
  margin: 14px 0 0;
  max-width: 18ch;
}

.page-about .ab-hero-lead {
  max-width: 60ch;
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.page-about .ab-fact {
  background: var(--ink);
  padding: 16px 14px;
}

.page-about .ab-fact .num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 5.2vw, 34px);
  line-height: 1.1;
  font-weight: 600;
  color: var(--neon);
  letter-spacing: -.01em;
}

.page-about .ab-fact-label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-hero-note {
  display: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: 56px 0;
}

.page-about .ab-chapter + .ab-chapter {
  border-top: 1px solid var(--line);
}

.page-about .ab-chapter--board {
  background: linear-gradient(180deg, var(--deep) 0%, var(--ink) 100%);
}

.page-about .ab-chapter-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 26px;
}

.page-about .ab-num {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(38px, 11vw, 92px);
  line-height: .78;
  letter-spacing: -.04em;
  color: var(--turf);
}

.page-about .ab-chapter-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 4.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 0;
  padding-top: 4px;
}

.page-about .ab-body {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
  max-width: 68ch;
  margin: 0 0 16px;
}

.page-about .ab-body--wide {
  max-width: 82ch;
}

.page-about .ab-body a {
  color: var(--neon-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 250, 216, .45);
}

.page-about .ab-body a:hover {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ---------- 01 编制 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .ab-role-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-role {
  padding: 16px 18px;
  background: var(--board);
  border-left: 2px solid var(--neon);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .ab-role-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  margin: 0 0 7px;
  color: var(--neon-soft);
}

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

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
  background: var(--board);
}

.page-about .ab-figure--tall img {
  aspect-ratio: 3 / 4;
}

.page-about .ab-figure--wide img {
  aspect-ratio: 21 / 10;
  border-radius: var(--r-lg);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 02 小组 ---------- */
.page-about .ab-squads {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .ab-squad {
  position: relative;
  padding: 22px 20px 20px;
  background: linear-gradient(158deg, var(--board) 0%, var(--deep) 100%);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}

.page-about .ab-squad::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--ab-squad-accent);
  opacity: .5;
  transition: opacity .3s var(--ease);
}

.page-about .ab-squad--csl { --ab-squad-accent: var(--neon); }
.page-about .ab-squad--league1 { --ab-squad-accent: var(--neon-soft); }
.page-about .ab-squad--cup { --ab-squad-accent: var(--amber); }

.page-about .ab-squad:hover,
.page-about .ab-squad:focus-within {
  transform: translateY(-4px);
  border-color: var(--ab-squad-accent);
}

.page-about .ab-squad:hover::after,
.page-about .ab-squad:focus-within::after {
  opacity: 1;
}

.page-about .ab-squad-tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ab-squad-accent);
}

.page-about .ab-squad-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 3.6vw, 23px);
  font-weight: 700;
  line-height: 1.24;
  margin: 0 0 10px;
}

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

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

.page-about .ab-squad-points li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .ab-squad-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 1px;
  background: var(--ab-squad-accent);
}

.page-about .ab-callout {
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px dashed var(--turf);
  border-radius: var(--r-sm);
  background: rgba(22, 48, 42, .5);
}

.page-about .ab-callout p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 03 复核步骤 ---------- */
.page-about .ab-chapter--board .ab-figure--wide {
  margin-bottom: 28px;
}

.page-about .ab-steps {
  list-style: none;
  counter-reset: abstep;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-step {
  position: relative;
  background: var(--ink);
  padding: 20px 18px 20px 54px;
}

.page-about .ab-step::before {
  counter-increment: abstep;
  content: counter(abstep, decimal-leading-zero);
  position: absolute;
  left: 17px;
  top: 21px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--neon);
}

.page-about .ab-step-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  line-height: 1.3;
}

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

/* ---------- 通栏纹理带 ---------- */
.page-about .ab-band {
  margin: 0;
  padding: 0;
}

.page-about .ab-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  filter: saturate(.72) contrast(1.05);
  opacity: .82;
}

/* ---------- 04 时间轴 ---------- */
.page-about .ab-chapter--timeline {
  padding-top: 60px;
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  display: grid;
  gap: 16px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--turf) 0%, var(--neon) 55%, var(--turf) 100%);
}

.page-about .ab-node {
  position: relative;
  padding: 16px 18px;
  background: var(--deep);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 21px;
  box-sizing: border-box;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--line);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .ab-node:hover,
.page-about .ab-node:focus-within {
  border-color: var(--turf);
  background: var(--board);
}

.page-about .ab-node:hover::before,
.page-about .ab-node:focus-within::before {
  border-color: var(--neon);
  background: var(--neon);
}

.page-about .ab-node--now {
  border-color: var(--turf);
}

.page-about .ab-node--now::before {
  border-color: var(--neon);
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(53, 240, 192, .14);
}

.page-about .ab-node:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-about .ab-node-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--neon);
}

.page-about .ab-node-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 3.6vw, 22px);
  line-height: 1.28;
  margin: 0 0 8px;
}

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

/* ---------- 05 引用与合作 ---------- */
.page-about .ab-chapter--narrow .wrap {
  max-width: 780px;
}

.page-about .ab-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-chapter {
    padding: 68px 0;
  }

  .page-about .ab-step {
    padding: 24px 24px 24px 64px;
  }

  .page-about .ab-step::before {
    left: 24px;
    top: 26px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero {
    padding: 116px 0 64px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-squads {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-chapter {
    padding: 80px 0;
  }

  .page-about .ab-chapter-head {
    gap: 22px;
    margin-bottom: 32px;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero-inner {
    padding-right: var(--ab-note-w);
  }

  .page-about .ab-hero-note {
    display: block;
    position: absolute;
    right: 16px;
    top: 150px;
  }

  .page-about .ab-hero-note .note-vertical {
    margin: 0;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 11px;
    letter-spacing: .24em;
    line-height: 1;
    color: var(--muted);
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .ab-node-body {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .45s var(--ease), opacity .35s var(--ease), margin-top .35s var(--ease);
  }

  .page-about .ab-node:hover .ab-node-body,
  .page-about .ab-node:focus-within .ab-node-body {
    max-height: 260px;
    opacity: 1;
    margin-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-squad,
  .page-about .ab-node,
  .page-about .ab-node::before {
    transition: none;
  }

  .page-about .ab-squad:hover,
  .page-about .ab-squad:focus-within {
    transform: none;
  }

  .page-about .ab-node-body {
    max-height: none !important;
    opacity: 1 !important;
    overflow: visible !important;
    transition: none !important;
  }
}