.page-about {
  display: block;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-top: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(44px, 6vw, 88px);
  border-bottom: 1px solid var(--line);
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(58% 68% at 88% 6%, rgba(59, 240, 200, 0.13), transparent 62%);
}
.page-about .ab-hero .shell {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 56px);
}
.page-about .ab-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(34px, 5.6vw, 72px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.page-about .ab-hero .lead {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-hero__actions {
  margin-top: clamp(24px, 3vw, 36px);
}
.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--ink-2);
  box-shadow: var(--shadow-lift);
}
.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.page-about .ab-hero__stamp {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--cyan);
}
@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

/* ---------- 正文两栏：索引 + 内容 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}
@media (min-width: 1024px) {
  .page-about .ab-body {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 84px);
  }
}

.page-about .ab-index {
  padding-top: clamp(36px, 5vw, 64px);
}
.page-about .ab-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--grid);
}
.page-about .ab-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-index__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .ab-index__tick {
  flex: 0 0 auto;
  width: 14px;
  height: 1px;
  background: var(--line-strong);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--white);
}
.page-about .ab-index__link:hover .ab-index__tick,
.page-about .ab-index__link:focus-visible .ab-index__tick {
  width: 26px;
  background: var(--cyan);
}
@media (min-width: 1024px) {
  .page-about .ab-index {
    position: sticky;
    top: 96px;
    align-self: start;
    max-height: calc(100vh - 128px);
    overflow: auto;
    padding-top: clamp(56px, 6vw, 104px);
    padding-bottom: 32px;
  }
  .page-about .ab-index__list {
    display: block;
  }
}

.page-about .ab-content {
  min-width: 0;
  padding-top: clamp(36px, 5vw, 64px);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  padding: clamp(40px, 5.5vw, 88px) 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-sec__head {
  display: grid;
  gap: 12px;
  max-width: 52ch;
  margin-bottom: clamp(24px, 3.5vw, 44px);
}
.page-about .ab-h2 {
  margin: 0;
  font-size: clamp(25px, 3vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 52px);
}
.page-about .ab-split__main {
  min-width: 0;
}
.page-about .ab-p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-p:last-child {
  margin-bottom: 0;
}
@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
  .page-about .ab-split--rev {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }
}

/* 旁注 */
.page-about .ab-side {
  align-self: start;
  padding: clamp(16px, 2vw, 22px) 0 clamp(16px, 2vw, 22px) clamp(16px, 2vw, 24px);
  border-left: 1px solid var(--line-strong);
}
.page-about .ab-side__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-about .ab-side__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .ab-link {
  display: inline-block;
  margin-top: 12px;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-soft);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  border-bottom-color: var(--cyan);
}
@media (max-width: 899px) {
  .page-about .ab-side {
    padding: 18px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-strong);
  }
}

/* 斜向引导线 */
.page-about .ab-slant {
  position: relative;
  height: clamp(38px, 5vw, 70px);
}
.page-about .ab-slant::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: min(42%, 220px);
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  transform: rotate(-7deg);
  transform-origin: left center;
}

/* ---------- 三条主线 ---------- */
.page-about .ab-lines {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-lines__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  padding: clamp(16px, 2.2vw, 26px) 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-lines__item:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .ab-lines__num {
  grid-row: 1 / span 2;
  padding-top: 5px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .ab-lines__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}
.page-about .ab-lines__text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 赛季时间轴 ---------- */
.page-about .ab-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}
.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan-soft), var(--line-strong) 42%, transparent);
}
.page-about .ab-tl__item {
  position: relative;
  padding-bottom: clamp(24px, 3vw, 38px);
}
.page-about .ab-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .ab-tl__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}
.page-about .ab-tl__dot {
  position: absolute;
  left: -30px;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .ab-tl__item--ver .ab-tl__dot {
  border-color: var(--signal);
}
.page-about .ab-tl__era {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--grid);
}
.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}
.page-about .ab-tl__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .ab-tl__note {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cyan);
  transition: max-height 0.24s var(--ease), opacity 0.24s var(--ease), margin 0.24s var(--ease);
}
.page-about .ab-tl__item:hover .ab-tl__dot,
.page-about .ab-tl__item:focus-within .ab-tl__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(59, 240, 200, 0.16);
}
@media (max-width: 899px) {
  .page-about .ab-tl__note {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}
@media (min-width: 900px) {
  .page-about .ab-tl__item:hover .ab-tl__note,
  .page-about .ab-tl__item:focus-within .ab-tl__note {
    max-height: 6em;
    opacity: 1;
    margin-top: 8px;
  }
}

/* ---------- 图 ---------- */
.page-about .ab-fig {
  margin: clamp(28px, 4vw, 48px) 0 0;
}
.page-about .ab-fig--tight {
  margin-top: 0;
}
.page-about .ab-fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}
.page-about .ab-fig .figure-caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grid);
}

/* ---------- 覆盖范围关系图 ---------- */
.page-about .ab-map {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-map__node {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  padding: clamp(16px, 2.2vw, 24px) 0;
  border-top: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}
.page-about .ab-map__node:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .ab-map__dot {
  grid-row: 1 / span 2;
  align-self: start;
  margin-top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--grid);
  background: transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .ab-map__node--md .ab-map__dot {
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-color: var(--cyan-soft);
}
.page-about .ab-map__node--lg .ab-map__dot {
  width: 15px;
  height: 15px;
  margin-top: 4px;
  border-color: var(--cyan);
}
.page-about .ab-map__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}
.page-about .ab-map__desc {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .ab-map__node:hover,
.page-about .ab-map__node:focus-within {
  border-top-color: var(--line-strong);
}
.page-about .ab-map__node:hover .ab-map__dot,
.page-about .ab-map__node:focus-within .ab-map__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(59, 240, 200, 0.14);
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .ab-team__cell {
  background: var(--ink-2);
  padding: clamp(20px, 3vw, 32px);
}
.page-about .ab-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 4.6vw, 58px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}
.page-about .ab-team__unit {
  margin-left: 6px;
  font-size: 14px;
  color: var(--grid);
}
.page-about .ab-team__role {
  margin: 12px 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.page-about .ab-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
@media (min-width: 760px) {
  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 版本与更新节奏 ---------- */
.page-about .ab-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-about .ab-ver {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-ver:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}
.page-about .ab-ver__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: var(--radius);
}
.page-about .ab-ver__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}
.page-about .ab-ver__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
@media (min-width: 760px) {
  .page-about .ab-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .ab-cadence {
  display: grid;
  gap: 0;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-cadence li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-cadence__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .ab-cadence__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}
@media (min-width: 700px) {
  .page-about .ab-cadence li {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* ---------- 合作与认可 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 48px);
}
.page-about .ab-partners__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-partners__item {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-partners__item:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .ab-partners__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}
.page-about .ab-partners__text {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}
@media (min-width: 900px) {
  .page-about .ab-partners {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 收束 ---------- */
.page-about .ab-outro {
  display: grid;
  gap: 18px;
  justify-items: start;
  padding: clamp(44px, 6vw, 88px) 0 clamp(56px, 8vw, 112px);
  border-top: 1px solid var(--line);
}
.page-about .ab-outro h2 {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(24px, 3vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.page-about .ab-outro p {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-outro__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
}
.page-about .ab-outro__actions .ab-link {
  margin-top: 0;
}
<<<END>>>