.page-about {
  --ab-rail-w: 116px;
  background: var(--gray-050);
  color: var(--text);
}

.page-about img {
  max-width: 100%;
}

/* ===== 封面 ===== */
.page-about .ab-hero {
  position: relative;
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(32px, 5vw, 60px);
  border-bottom: var(--hairline-strong);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, #35E6C4 0%, rgba(53, 230, 196, 0) 62%);
}

.page-about .ab-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-hero__title {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 66px);
  line-height: 1.03;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__intro {
  margin: 0;
  max-width: 30em;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.62;
}

.page-about .ab-facts {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--gray-300);
  border: var(--hairline-strong);
}

.page-about .ab-facts__item {
  background: var(--gray-050);
  padding: 14px 16px;
}

.page-about .ab-facts__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink-900);
}

.page-about .ab-facts__label {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ab-hero__media {
  margin: 0;
  border: var(--hairline-strong);
  background: var(--gray-100);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-hero__media figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-top: var(--hairline);
}

/* ===== 档案主体与年份刻度 ===== */
.page-about .ab-dossier {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-rail {
  display: none;
}

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

.page-about .ab-rail__label {
  display: block;
  margin-bottom: 16px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-left: var(--hairline-strong);
}

.page-about .ab-rail__link {
  display: block;
  margin-left: -1px;
  padding: 9px 0 9px 14px;
  border-left: 2px solid transparent;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  border-left-color: #35E6C4;
  background: rgba(53, 230, 196, 0.1);
  outline: none;
}

.page-about .ab-rail__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-900);
}

.page-about .ab-rail__note {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  line-height: 1.4;
  color: var(--muted);
}

/* ===== 章节与标题 ===== */
.page-about .ab-section {
  padding: clamp(36px, 5vw, 64px) 0;
  border-top: var(--hairline);
}

.page-about .ab-body > .ab-section:first-child {
  border-top: 0;
}

.page-about .ab-head {
  max-width: 38em;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .ab-h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .ab-lede {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.62;
  color: var(--muted);
}

/* ===== 赛季时间线 ===== */
.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--hairline-strong);
}

.page-about .ab-tl__item {
  border-bottom: var(--hairline);
}

.page-about .ab-tl__sum {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) 16px;
  gap: 4px 14px;
  align-items: baseline;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease);
}

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

.page-about .ab-tl__sum:hover {
  background: rgba(18, 58, 51, 0.05);
}

.page-about .ab-tl__sum:focus-visible {
  outline: 2px solid #35E6C4;
  outline-offset: 3px;
}

.page-about .ab-tl__sum::after {
  content: "+";
  grid-column: 3;
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.4;
  color: var(--ink-700);
}

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

.page-about .ab-tl__yr {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-700);
}

.page-about .ab-tl__name {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .ab-tl__body {
  max-width: 40em;
  padding: 0 0 18px;
}

.page-about .ab-tl__body p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .ab-tl__body p:last-child {
  margin-bottom: 0;
}

.page-about .ab-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--hairline-strong);
  background: var(--ink-900);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ===== 团队分工 ===== */
.page-about .ab-team {
  display: grid;
  gap: 1px;
  background: var(--gray-300);
  border-top: var(--hairline-strong);
  border-bottom: var(--hairline-strong);
}

.page-about .ab-team__card {
  background: var(--gray-050);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .ab-team__card:nth-child(2) {
  background: var(--gray-100);
}

.page-about .ab-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 60px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .ab-team__role {
  display: block;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ab-team__text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.62;
}

.page-about .ab-team__beat {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: var(--hairline);
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

/* ===== 核校流程（深色） ===== */
.page-about .ab-section--ink {
  margin: clamp(24px, 3vw, 36px) 0;
  padding: clamp(30px, 4.4vw, 52px) clamp(20px, 3vw, 44px);
  background: var(--ink-900);
  border-top: 0;
  color: var(--on-ink);
}

.page-about .ab-section--ink .kicker {
  color: #35E6C4;
}

.page-about .ab-section--ink .ab-h2 {
  color: var(--gray-050);
}

.page-about .ab-section--ink .ab-lede {
  color: var(--on-ink-muted);
}

.page-about .ab-flow-grid {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
}

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

.page-about .ab-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--hairline);
  object-fit: cover;
}

.page-about .ab-flow {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .ab-flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  padding-top: 16px;
  border-top: var(--hairline);
}

.page-about .ab-flow__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: #35E6C4;
  padding-top: 3px;
}

.page-about .ab-flow__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--gray-050);
}

.page-about .ab-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--on-ink-muted);
}

/* ===== 协作网络数据 ===== */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--gray-300);
  border-top: var(--hairline-strong);
  border-bottom: var(--hairline-strong);
}

.page-about .ab-stats__cell {
  background: var(--gray-050);
  padding: clamp(16px, 2.2vw, 24px);
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .ab-stats__unit {
  font-size: 0.42em;
  font-weight: 500;
  margin-left: 0.15em;
  letter-spacing: 0;
  color: var(--muted);
}

.page-about .ab-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
}

.page-about .ab-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .ab-note + .ab-note {
  margin-top: 12px;
}

/* ===== 组别专栏 ===== */
.page-about .ab-groups {
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.page-about .ab-group {
  padding-top: 16px;
  border-top: 2px solid var(--ink-900);
}

.page-about .ab-group .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .ab-group h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .ab-group p {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

/* ===== 下一步 ===== */
.page-about .ab-next {
  padding: clamp(34px, 5vw, 60px) 0 0;
  border-top: var(--hairline-strong);
}

.page-about .ab-next__list {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--gray-300);
  border: var(--hairline-strong);
}

.page-about .ab-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 16px 18px;
  background: var(--gray-050);
  text-decoration: none;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-next__link:hover {
  background: var(--ink-900);
  color: var(--gray-050);
}

.page-about .ab-next__link:focus-visible {
  outline: 2px solid #35E6C4;
  outline-offset: -2px;
}

.page-about .ab-next__go {
  font-family: var(--font-mono);
  color: var(--muted);
}

.page-about .ab-next__link:hover .ab-next__go {
  color: #35E6C4;
}

/* ===== 断点 ===== */
@media (min-width: 560px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .ab-tl__body {
    padding-left: 82px;
  }

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

@media (min-width: 760px) {
  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 820px) {
  .page-about .ab-flow-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-dossier {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
    padding: clamp(36px, 5vw, 64px) 18px 32px 0;
  }

  .page-about .ab-body {
    padding-left: clamp(24px, 3vw, 48px);
  }
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .ab-team__beat {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    opacity: 0;
    overflow: hidden;
    border-top-color: transparent;
    transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease),
      margin-top 0.22s var(--ease), padding-top 0.22s var(--ease);
  }

  .page-about .ab-team__card:hover .ab-team__beat {
    max-height: 180px;
    margin-top: 14px;
    padding-top: 12px;
    opacity: 1;
    border-top-color: rgba(195, 187, 176, 0.38);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-tl__sum,
  .page-about .ab-next__link,
  .page-about .ab-team__beat {
    transition: none;
  }
}
<<<END>>>