.page-about {
  --ab-hairline: 1px;
  --ab-rail-w: 190px;
  display: block;
  background: var(--abyss);
  color: var(--score-white);
  font-family: var(--font-body);
}

/* ============ 面包屑 ============ */
.page-about .breadcrumbs {
  padding: 14px var(--gutter) 0;
  max-width: var(--maxw);
  margin: 0 auto;
}
.page-about .breadcrumbs ol {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel-mist);
  text-transform: uppercase;
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-dim);
}
.page-about .breadcrumbs a {
  color: var(--steel-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
  outline: none;
}
.page-about .breadcrumbs li:last-child {
  color: var(--score-white);
}

/* ============ HERO ============ */
.page-about .ab-hero {
  padding: 40px var(--gutter) 64px;
  position: relative;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--line-dim);
}
.page-about .ab-hero-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: end;
}
.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--neon-cyan);
  margin: 0 0 18px;
  padding-left: 22px;
  position: relative;
}
.page-about .eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  height: 2px;
  background: var(--neon-cyan);
  transform: translateY(-50%);
}
.page-about h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 5.6vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--score-white);
  margin: 0 0 22px;
  max-width: 18ch;
}
.page-about .ab-hero-lede {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.72;
  color: var(--steel-mist);
  max-width: 62ch;
  margin: 0 0 32px;
}
.page-about .ab-hero-lede::first-letter {
  color: var(--score-white);
}

.page-about .ab-hero-stats {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
  border-top: 1px solid var(--line-dim);
  padding-top: 22px;
}
.page-about .ab-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-left: 2px solid var(--neon-cyan);
  padding-left: 12px;
}
.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.4vw, 34px);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--score-white);
  line-height: 1;
}
.page-about .ab-stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel-mist);
}

.page-about .ab-hero-fig {
  position: relative;
  border: 1px solid var(--line-dim);
  overflow: hidden;
  background: var(--sea-slab);
}
.page-about .ab-hero-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.05);
}

/* ============ 主体布局 ============ */
.page-about .ab-body {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter) 96px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

/* ============ 侧栏目录 ============ */
.page-about .ab-rail {
  position: sticky;
  top: calc(var(--header-h) + 12px);
  align-self: start;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 6px 10px;
  padding: 14px 0;
  border-top: 1px solid var(--line-dim);
  border-bottom: 1px solid var(--line-dim);
}
.page-about .ab-rail-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--steel-mist);
  flex-basis: 100%;
  margin-bottom: 4px;
}
.page-about .rail-link {
  display: block;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--steel-mist);
  text-decoration: none;
  padding: 4px 8px;
  border-left: 2px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}
.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--score-white);
  border-left-color: var(--cyan-deep);
  outline: none;
}
.page-about .rail-link.is-active {
  color: var(--neon-cyan);
  border-left-color: var(--neon-cyan);
  background: rgba(53, 240, 208, 0.06);
}

/* ============ 章节通用 ============ */
.page-about .ab-flow {
  display: flex;
  flex-direction: column;
  gap: 64px;
}
.page-about .ab-section {
  position: relative;
  padding: 10px 0 0;
}
.page-about .ab-section + .ab-section {
  padding-top: 48px;
}
.page-about .section-head {
  margin-bottom: 26px;
}
.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--score-white);
  margin: 0;
  max-width: 22ch;
  position: relative;
  padding-left: 20px;
}
.page-about .section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.28em;
  bottom: 0.28em;
  width: 2px;
  background: var(--neon-cyan);
}
.page-about .prose {
  max-width: 68ch;
  color: var(--score-white);
}
.page-about .prose p {
  font-size: 17px;
  line-height: 1.78;
  margin: 0 0 1.2em;
  color: #d6e2ea;
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-link-list {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .ab-link-list li a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-dim);
  padding-bottom: 4px;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}
.page-about .ab-link-list li a::before {
  content: "→ ";
  color: var(--cyan-deep);
  margin-right: 4px;
}
.page-about .ab-link-list li a:hover,
.page-about .ab-link-list li a:focus-visible {
  border-bottom-color: var(--neon-cyan);
  color: var(--score-white);
  outline: none;
}

/* ============ 章节：海床分区背景 ============ */
.page-about .ab-section--slab {
  background: var(--sea-slab);
  margin: 0 calc(-1 * var(--gutter));
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  padding-top: 44px;
  padding-bottom: 44px;
}

/* ============ 编辑流程网格 ============ */
.page-about .ab-editing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}
.page-about .ab-editing-fig {
  border: 1px solid var(--line-dim);
  background: var(--grid-slate);
  padding: 0;
  margin: 0;
  position: relative;
}
.page-about .ab-editing-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.05);
}
.page-about .ab-editing-fig .frame-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--steel-mist);
  padding: 10px 12px;
  border-top: 1px solid var(--line-dim);
  margin: 0;
}

/* ============ 四步流程条 ============ */
.page-about .ab-flowbar {
  margin-top: 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line-dim);
}
.page-about .ab-flow-step {
  position: relative;
  padding: 20px 20px 20px 56px;
  border-bottom: 1px solid var(--line-dim);
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  transition: background 220ms var(--ease);
}
.page-about .ab-flow-step::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 26px;
  width: 24px;
  height: 2px;
  background: var(--neon-cyan);
}
.page-about .ab-flow-step::after {
  content: "";
  position: absolute;
  left: 22px;
  top: 52px;
  bottom: 0;
  width: 1px;
  background: var(--line-dim);
}
.page-about .ab-flow-step:last-child::after {
  display: none;
}
.page-about .ab-flow-step:hover {
  background: rgba(53, 240, 208, 0.04);
}
.page-about .ab-flow-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan-deep);
}
.page-about .ab-flow-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--score-white);
}
.page-about .ab-flow-note {
  font-size: 14px;
  line-height: 1.6;
  color: var(--steel-mist);
}

/* ============ 赛季档案 ============ */
.page-about .ab-archive {
  position: relative;
  overflow: hidden;
}
.page-about .ab-archive-bg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  opacity: 0.22;
  filter: saturate(0.7);
  margin: 0 0 40px;
  border-top: 1px solid var(--line-dim);
  border-bottom: 1px solid var(--line-dim);
}
.page-about .ab-seasons {
  list-style: none;
  padding: 0;
  margin: 32px 0 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line-dim);
  counter-reset: season;
}
.page-about .ab-season {
  border-bottom: 1px solid var(--line-dim);
}
.page-about .ab-season details {
  padding: 0;
}
.page-about .ab-season summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 12px 18px 4px;
  display: grid;
  grid-template-columns: 80px 1fr;
  align-items: baseline;
  gap: 16px;
  transition: background 200ms var(--ease);
  position: relative;
}
.page-about .ab-season summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-season summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--neon-cyan);
  line-height: 1;
  transition: transform 240ms var(--ease);
}
.page-about .ab-season details[open] summary::after {
  content: "−";
}
.page-about .ab-season summary:hover,
.page-about .ab-season summary:focus-visible {
  background: rgba(53, 240, 208, 0.05);
  outline: none;
}
.page-about .ab-season-year {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--neon-cyan);
}
.page-about .ab-season-note {
  font-size: 15px;
  line-height: 1.6;
  color: var(--score-white);
}
.page-about .ab-season-detail {
  margin: 0;
  padding: 4px 52px 22px 100px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-mist);
}

/* ============ 团队构成 ============ */
.page-about .ab-intro {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: #d6e2ea;
  margin: 0 0 30px;
}
.page-about .ab-bars {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.page-about .ab-bar {
  display: grid;
  grid-template-columns: 132px 1fr 62px;
  align-items: center;
  gap: 14px;
  font-size: 13px;
}
.page-about .ab-bar-name {
  font-family: var(--font-body);
  color: var(--score-white);
  letter-spacing: 0.02em;
}
.page-about .ab-bar-track {
  display: block;
  position: relative;
  height: 8px;
  background: var(--grid-slate);
  overflow: hidden;
}
.page-about .ab-bar-fill {
  display: block;
  height: 100%;
  width: calc(var(--pct) * 1%);
  background: linear-gradient(90deg, var(--cyan-deep), var(--neon-cyan));
  transform-origin: left center;
  animation: ab-bar-grow 900ms var(--ease) both;
}
.page-about .ab-bar-val {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--neon-cyan);
  text-align: right;
  letter-spacing: 0.04em;
}
@keyframes ab-bar-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* ============ 运营信息表 ============ */
.page-about .ab-register {
  margin: 0;
  border-top: 1px solid var(--line-dim);
}
.page-about .ab-register-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line-dim);
}
.page-about .ab-register dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel-mist);
}
.page-about .ab-register dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--score-white);
}
.page-about .ab-register dd.num {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}
.page-about .ab-register a {
  color: var(--neon-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-dim);
  padding-bottom: 1px;
  transition: border-color 180ms var(--ease);
}
.page-about .ab-register a:hover,
.page-about .ab-register a:focus-visible {
  border-bottom-color: var(--neon-cyan);
  outline: none;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about h1 { max-width: 16ch; }
  .page-about .ab-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 32px;
  }
  .page-about .ab-editing-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 40px;
  }
  .page-about .ab-flowbar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-flow-step {
    border-bottom: none;
    border-right: 1px solid var(--line-dim);
    padding: 20px 22px 22px 22px;
  }
  .page-about .ab-flow-step:last-child {
    border-right: none;
  }
  .page-about .ab-flow-step::before {
    left: 22px;
    top: 22px;
  }
  .page-about .ab-flow-step::after {
    left: 22px;
    top: 46px;
    width: 24px;
    height: 1px;
    bottom: auto;
  }
  .page-about .ab-flow-step:last-child::after { display: none; }
  .page-about .ab-register-row {
    grid-template-columns: 180px 1fr;
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 1020px) {
  .page-about .ab-hero {
    padding-top: 56px;
    padding-bottom: 88px;
  }
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 56px;
  }
  .page-about .ab-body {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: 64px;
  }
  .page-about .ab-rail {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
    padding: 20px 0;
    border-bottom: none;
  }
  .page-about .ab-rail-title {
    margin-bottom: 12px;
  }
  .page-about .rail-link {
    padding: 8px 10px;
  }
  .page-about .ab-flow {
    gap: 88px;
  }
  .page-about .ab-section--slab {
    margin: 0 -40px;
    padding-left: 40px;
    padding-right: 40px;
    padding-top: 56px;
    padding-bottom: 56px;
  }
  .page-about .ab-editing-grid {
    gap: 56px;
  }
  .page-about .ab-bar {
    grid-template-columns: 160px 1fr 76px;
  }
  .page-about .ab-season summary {
    grid-template-columns: 110px 1fr;
    padding: 22px 16px 22px 4px;
  }
  .page-about .ab-season-detail {
    padding-left: 130px;
    padding-right: 80px;
  }
}

@media (min-width: 1280px) {
  .page-about .ab-hero-grid {
    gap: 72px;
  }
  .page-about .ab-body {
    gap: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar-fill {
    animation: none;
  }
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
</main>

.page-about {
  --pct: 1rem;
}