.page-about {
  --ab-stroke: rgba(143, 168, 155, .42);
  --ab-cyan-ghost: rgba(59, 231, 210, .12);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
  align-items: end;
}

.page-about .ab-hero__copy {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 22px);
  min-width: 0;
}

.page-about .ab-hero__copy .yb-crumbs {
  margin-bottom: 2px;
}

.page-about .ab-hero .yb-h1 {
  margin: 0;
  font-size: clamp(34px, 6.4vw, 82px);
  line-height: 1.05;
  letter-spacing: .015em;
}

.page-about .ab-hero .yb-h1 b {
  font-weight: 600;
  color: var(--pulse);
}

.page-about .ab-hero .yb-lede {
  margin: 0;
  max-width: 44ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--soft);
}

.page-about .ab-figures {
  list-style: none;
  margin: clamp(6px, 1.6vw, 14px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-figures li {
  background: var(--ink-900);
  padding: clamp(10px, 1.6vw, 16px) clamp(10px, 1.6vw, 16px);
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .ab-figures__n {
  font-size: clamp(20px, 2.4vw, 30px);
  line-height: 1;
  color: var(--pulse);
  font-weight: 500;
}

.page-about .ab-figures__l {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--dim);
}

.page-about .ab-hero__fig {
  margin: 0;
  min-width: 0;
}

.page-about .ab-hero__fig .yb-media {
  aspect-ratio: 16 / 10;
  width: 100%;
}

.page-about .ab-hero__fig .yb-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-hero__fig .yb-media__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--dim);
  line-height: 1.6;
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-ch {
  position: relative;
}

.page-about .ab-ch__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 28px);
}

.page-about .ab-ch__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 78px);
  line-height: .82;
  font-weight: 300;
  letter-spacing: -.02em;
  color: var(--ab-cyan-ghost);
  -webkit-text-stroke: 1px var(--ab-stroke);
  user-select: none;
  padding-top: 2px;
}

.page-about .ab-ch__main {
  min-width: 0;
}

.page-about .ab-ch__main .yb-h2 {
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .ab-lead {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
  max-width: 52ch;
  font-size: clamp(15px, 1.4vw, 16px);
  line-height: 1.8;
  color: var(--soft);
}

.page-about .yb-prose p {
  margin: 0 0 1em;
}

.page-about .yb-prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-inline {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 231, 210, .42);
  padding-bottom: 1px;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .ab-inline:hover,
.page-about .ab-inline:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 边注列 ---------- */

.page-about .ab-ch__side {
  display: flex;
  flex-direction: column;
  gap: 5px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  min-width: 0;
}

.page-about .ab-side__k {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--moss);
  text-transform: uppercase;
}

.page-about .ab-side__k:first-child {
  margin-top: 0;
}

.page-about .ab-side__v {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--softer);
  word-break: break-word;
}

/* ---------- 三条线结构图 ---------- */

.page-about .ab-map {
  list-style: none;
  margin: clamp(4px, 1.4vw, 10px) 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-map__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px 12px;
  padding: clamp(12px, 1.8vw, 18px) clamp(12px, 2vw, 20px);
  background: var(--ink-800);
  transition: background .18s var(--ease);
  outline: none;
}

.page-about .ab-map__row:hover,
.page-about .ab-map__row:focus-visible {
  background: var(--ink-700);
}

.page-about .ab-map__row:focus-visible {
  box-shadow: inset 0 0 0 1px var(--pulse);
}

.page-about .ab-map__idx {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--dim);
}

.page-about .ab-map__name {
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--paper);
  letter-spacing: .03em;
  min-width: 0;
}

.page-about .ab-map__role {
  justify-self: end;
}

.page-about .ab-map__tip {
  grid-column: 1 / -1;
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--softer);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .22s var(--ease), opacity .22s var(--ease);
}

.page-about .ab-map__row:hover .ab-map__tip,
.page-about .ab-map__row:focus .ab-map__tip,
.page-about .ab-map__row:focus-within .ab-map__tip {
  max-height: 9em;
  opacity: 1;
}

/* ---------- 团队区双栏 ---------- */

.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .ab-team__fig {
  margin: 0;
  min-width: 0;
}

.page-about .ab-team__fig .yb-media {
  aspect-ratio: 3 / 2;
  width: 100%;
}

.page-about .ab-team__fig .yb-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-team__fig .yb-media__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--dim);
  line-height: 1.6;
}

/* ---------- 更新节奏 ---------- */

.page-about .ab-beats {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(14px, 2vw, 22px);
  border-left: 1px solid var(--line);
}

.page-about .ab-beats__item {
  position: relative;
  padding-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .ab-beats__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-beats__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(14px, 2vw, 22px) - 4px);
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--pulse);
}

.page-about .ab-beats__item:nth-child(2)::before {
  background: var(--flare);
}

.page-about .ab-beats__item:nth-child(3)::before {
  background: var(--amber);
}

.page-about .ab-beats__item:nth-child(4)::before {
  background: var(--moss);
}

.page-about .ab-beats__cycle {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--pulse);
}

.page-about .ab-beats__item:nth-child(2) .ab-beats__cycle {
  color: var(--flare);
}

.page-about .ab-beats__item:nth-child(3) .ab-beats__cycle {
  color: var(--amber);
}

.page-about .ab-beats__item:nth-child(4) .ab-beats__cycle {
  color: var(--moss);
}

.page-about .ab-beats__body {
  margin: 0;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.8;
  color: var(--soft);
  max-width: 60ch;
}

/* ---------- 赛季时间线 ---------- */

.page-about .ab-tl__banner {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
}

.page-about .ab-tl__banner .yb-media {
  aspect-ratio: 21 / 8;
  width: 100%;
}

.page-about .ab-tl__banner .yb-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-tl {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-tl__item {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-tl__sum {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: 4px clamp(12px, 2vw, 28px);
  align-items: baseline;
  padding: clamp(13px, 1.9vw, 20px) 0;
  cursor: pointer;
  list-style: none;
  position: relative;
}

.page-about .ab-tl__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl__sum::after {
  content: "+";
  position: absolute;
  right: 0;
  top: clamp(13px, 1.9vw, 20px);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--dim);
  transition: transform .18s var(--ease), color .18s var(--ease);
}

.page-about .ab-tl__d[open] .ab-tl__sum::after {
  content: "−";
  color: var(--pulse);
}

.page-about .ab-tl__sum:focus-visible {
  outline: 1px solid var(--pulse);
  outline-offset: 4px;
}

.page-about .ab-tl__s {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--pulse);
  white-space: nowrap;
}

.page-about .ab-tl__t {
  font-size: clamp(15px, 1.7vw, 19px);
  line-height: 1.5;
  color: var(--paper);
  letter-spacing: .02em;
  padding-right: 28px;
}

.page-about .ab-tl__b {
  margin: 0 0 clamp(14px, 1.8vw, 20px);
  padding-left: calc(12px + clamp(12px, 2vw, 28px));
  font-size: 14px;
  line-height: 1.8;
  color: var(--softer);
  max-width: 62ch;
}

/* ---------- 合作 ---------- */

.page-about .ab-ways {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(16px, 2.4vw, 24px) 0;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-ways__item {
  background: var(--ink-900);
  padding: clamp(14px, 2vw, 22px) 0;
}

.page-about .ab-ways__item .yb-h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.7vw, 19px);
  color: var(--paper);
}

.page-about .ab-ways__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--softer);
  max-width: 46ch;
}

.page-about .ab-ways__note {
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  font-size: 14px;
  line-height: 1.8;
  color: var(--softer);
  max-width: 62ch;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-ways {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    background: none;
  }

  .page-about .ab-ways__item {
    padding: clamp(16px, 2vw, 22px) 0;
    background: none;
  }

  .page-about .ab-ways__item + .ab-ways__item {
    border-left: 1px solid var(--line);
    padding-left: clamp(16px, 2.4vw, 28px);
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .ab-hero__fig .yb-media {
    aspect-ratio: 4 / 5;
  }

  .page-about .ab-ch__grid {
    grid-template-columns: clamp(76px, 7vw, 112px) minmax(0, 1fr) minmax(220px, 300px);
    gap: clamp(24px, 3vw, 46px);
    align-items: start;
  }

  .page-about .ab-ch__side {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 2px 0 0 clamp(14px, 1.8vw, 24px);
    margin-top: clamp(4px, 1vw, 10px);
  }

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

  .page-about .ab-tl__sum {
    grid-template-columns: clamp(96px, 10vw, 132px) minmax(0, 1fr);
  }
}

@media (max-width: 899px) {
  .page-about .ab-map__tip {
    max-height: none;
    opacity: 1;
    padding-top: 6px;
  }

  .page-about .ab-map__row {
    grid-template-columns: auto minmax(0, 1fr);
    row-gap: 2px;
  }

  .page-about .ab-map__role {
    justify-self: start;
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-map__tip,
  .page-about .ab-map__row,
  .page-about .ab-tl__sum::after,
  .page-about .ab-inline {
    transition: none;
  }
}
<<<END>>>