.page-about {
  --ab-rail-w: 250px;
  --ab-gap: clamp(28px, 4vw, 64px);
  --ab-line: var(--edge);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 通用小标 ---------- */
.page-about .ab-latin {
  margin: 0 0 14px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
}

/* ---------- 章节封面 ---------- */
.page-about .ab-crumbs {
  margin-bottom: clamp(26px, 4vw, 44px);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .ab-hero {
  position: relative;
  background: var(--green);
  color: var(--paper);
  padding-block: clamp(40px, 7vw, 84px) clamp(30px, 5vw, 56px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(244, 241, 232, 0.07) 1px, transparent 1px);
  background-size: 76px 100%;
  pointer-events: none;
}

.page-about .ab-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero .ab-latin {
  color: var(--lime);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 44px);
}

.page-about .ab-hero__title {
  margin: 0 0 18px;
  font-family: var(--f-display);
  font-size: clamp(38px, 7.4vw, 86px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--white);
  overflow-wrap: break-word;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.75;
  color: rgba(244, 241, 232, 0.82);
}

.page-about .ab-hero__figure {
  padding-top: 18px;
  border-top: 1px solid rgba(198, 255, 0, 0.45);
}

.page-about .ab-hero__num {
  margin: 0;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: clamp(68px, 14vw, 168px);
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: var(--lime);
  overflow-wrap: anywhere;
}

.page-about .ab-hero__caption {
  margin: 12px 0 0;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(244, 241, 232, 0.7);
}

.page-about .ab-hero__ticks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(18px, 3vw, 44px);
  margin: clamp(28px, 5vw, 54px) 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid rgba(244, 241, 232, 0.22);
  font-size: 14px;
  color: rgba(244, 241, 232, 0.76);
}

.page-about .ab-hero__ticks span {
  margin-right: 7px;
  font-family: var(--f-mono);
  font-weight: 700;
  color: var(--lime);
}

/* ---------- 主体双栏 ---------- */
.page-about .ab-body {
  padding-block: clamp(38px, 6vw, 88px);
}

.page-about .ab-body__grid {
  display: grid;
  gap: var(--ab-gap);
}

/* ---------- 左侧赛季沿革 ---------- */
.page-about .ab-rail__latin {
  margin-bottom: 8px;
}

.page-about .ab-rail__title {
  margin: 0 0 14px;
  font-family: var(--f-display);
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--green);
}

.page-about .ab-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--edge);
  background: var(--white);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  border-color: var(--green);
  color: var(--green);
}

.page-about .ab-rail__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .ab-rail__no {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--slate);
}

/* ---------- 内容块 ---------- */
.page-about .ab-block {
  padding-top: clamp(30px, 4.5vw, 58px);
  margin-top: clamp(30px, 4.5vw, 58px);
  border-top: 1px solid var(--ab-line);
  scroll-margin-top: 110px;
}

.page-about .ab-block:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-block__latin {
  margin: 0 0 16px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .ab-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 20px;
  margin-bottom: 20px;
}

.page-about .ab-block__num {
  margin: 0;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: clamp(46px, 8.4vw, 100px);
  line-height: 0.9;
  letter-spacing: -0.045em;
  color: var(--green);
  overflow-wrap: anywhere;
}

.page-about .ab-block__title {
  flex: 1 1 210px;
  min-width: 0;
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(21px, 3vw, 33px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-text {
  margin: 0 0 16px;
  max-width: 38em;
}

/* ---------- 图片 ---------- */
.page-about .ab-media {
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: 0;
  background: var(--green-deep);
}

.page-about .ab-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: grayscale(1) contrast(1.06);
}

.page-about .ab-media--dark img,
.page-about .media--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .ab-cap {
  display: block;
  margin-top: 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

/* ---------- 团队配比 ---------- */
.page-about .ab-bars {
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3.2vw, 34px) 0 0;
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 58px;
  align-items: center;
  gap: 12px;
}

.page-about .ab-bar__label {
  font-size: 14px;
  color: var(--slate);
}

.page-about .ab-bar__track {
  display: block;
  height: 16px;
  border: 1px solid var(--edge);
  background: var(--white);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--green);
  transition: width 420ms var(--ease);
}

.page-about .ab-bar--a .ab-bar__fill { width: 62%; }
.page-about .ab-bar--b .ab-bar__fill { width: 26%; background: var(--green-mid); }
.page-about .ab-bar--c .ab-bar__fill { width: 12%; background: var(--lime); }

.page-about .ab-bar:hover .ab-bar__val,
.page-about .ab-bar:focus-within .ab-bar__val {
  color: var(--green);
  font-weight: 700;
}

.page-about .ab-bar__val {
  font-family: var(--f-mono);
  font-size: 13px;
  text-align: right;
  color: var(--ink);
  transition: color var(--speed) var(--ease);
}

/* ---------- 四道校订 ---------- */
.page-about .ab-steps {
  display: grid;
  gap: 0;
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  position: relative;
  padding: 16px 0 16px 24px;
  border-left: 1px solid var(--ab-line);
}

.page-about .ab-step::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 22px;
  width: 8px;
  height: 8px;
  background: var(--lime);
  border: 1px solid var(--green);
}

.page-about .ab-step:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
}

.page-about .ab-step__no {
  display: block;
  margin-bottom: 6px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--green-mid);
}

.page-about .ab-step__title {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-size: 18px;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .ab-step__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 斜切色带 ---------- */
.page-about .ab-divider {
  height: clamp(34px, 5vw, 64px);
  margin: clamp(30px, 4.5vw, 60px) 0 clamp(24px, 3.5vw, 48px);
}

.page-about .ab-divider__slice {
  display: block;
  height: 100%;
  background: var(--lime);
  clip-path: polygon(0 34%, 100% 0%, 100% 66%, 0 100%);
}

/* ---------- 专题方向标签 ---------- */
.page-about .ab-tags-label {
  margin: clamp(22px, 3vw, 32px) 0 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .ab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 深色规模块 ---------- */
.page-about .ab-block--dark {
  padding: clamp(26px, 4vw, 48px);
  border-top: 0;
  background: var(--green);
  color: var(--paper);
}

.page-about .ab-block--dark .ab-block__latin {
  color: rgba(198, 255, 0, 0.82);
}

.page-about .ab-block--dark .ab-block__num {
  color: var(--lime);
}

.page-about .ab-block--dark .ab-block__title,
.page-about .ab-block--dark .ab-step__title {
  color: var(--white);
}

.page-about .ab-block--dark .ab-text {
  color: rgba(244, 241, 232, 0.84);
}

.page-about .ab-block--dark .ab-cap {
  color: rgba(244, 241, 232, 0.66);
}

.page-about .ab-block--dark .ab-media {
  background: var(--green-deep);
}

/* ---------- 章节尾注 ---------- */
.page-about .ab-footnote {
  margin-top: clamp(38px, 6vw, 80px);
  padding-top: clamp(22px, 3vw, 36px);
  border-top: 2px solid var(--ink);
}

.page-about .ab-footnote__text {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
}

.page-about .ab-footnote__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 18px;
}

.page-about .ab-footnote__meta {
  margin: 0;
  font-size: 14px;
  color: var(--slate);
}

.page-about .ab-footnote__meta a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-footnote__meta a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
    align-items: end;
  }

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

  .page-about .ab-step {
    padding: 24px 20px 0 0;
    border-left: 0;
    border-top: 1px solid var(--ab-line);
  }

  .page-about .ab-step::before {
    left: 0;
    top: -4.5px;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 1000px) {
  .page-about .ab-body__grid {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 84px);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .ab-rail__list {
    display: block;
    padding: 0;
    overflow: visible;
  }

  .page-about .ab-rail__list li + li {
    margin-top: 2px;
  }

  .page-about .ab-rail__link {
    align-items: baseline;
    border: 0;
    border-left: 2px solid var(--edge);
    background: transparent;
    padding: 9px 0 9px 14px;
    white-space: normal;
    transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease), padding-left var(--speed) var(--ease);
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    border-left-color: var(--lime);
    color: var(--green);
    padding-left: 18px;
  }

  .page-about .ab-block__head {
    gap: 8px 28px;
  }
}

/* ---------- 大屏 ---------- */
@media (min-width: 1200px) {
  .page-about {
    --ab-rail-w: 280px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-bar__fill,
  .page-about .ab-bar__val {
    transition: none;
  }

  .page-about .ab-bar__fill {
    width: 0;
  }

  .page-about .ab-bar--a .ab-bar__fill { width: 62%; }
  .page-about .ab-bar--b .ab-bar__fill { width: 26%; }
  .page-about .ab-bar--c .ab-bar__fill { width: 12%; }
}