.page-about {
  --ab-rail-w: 236px;
  --ab-ink-soft: rgba(245, 248, 251, .06);
  --ab-ink-line: rgba(245, 248, 251, .14);
  background: var(--yx-paper);
  color: var(--yx-ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  background: var(--yx-ink);
  color: var(--yx-paper);
  padding: clamp(20px, 3vw, 34px) 0 clamp(44px, 7vw, 92px);
  border-radius: 0 0 var(--yx-r-xl) var(--yx-r-xl);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: min(760px, 96vw);
  aspect-ratio: 1;
  background: radial-gradient(closest-side, var(--yx-cyan-16), transparent 72%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  top: -30%;
  width: min(520px, 80vw);
  aspect-ratio: 1;
  background: radial-gradient(closest-side, var(--yx-orange-14), transparent 70%);
  pointer-events: none;
}

.page-about .ab-hero__crumbs .yx-crumbs__link {
  color: var(--yx-silver);
}

.page-about .ab-hero__crumbs .yx-crumbs__link:hover {
  color: var(--yx-cyan);
}

.page-about .ab-hero__crumbs .yx-crumbs__item,
.page-about .ab-hero__crumbs .yx-crumbs__sep {
  color: var(--yx-slate);
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  margin-top: clamp(28px, 5vw, 56px);
}

.page-about .ab-hero__title {
  margin: 0 0 18px;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -.02em;
  max-width: 18ch;
}

.page-about .ab-hero__lede {
  color: var(--yx-silver);
  margin: 0;
  max-width: 46ch;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-fact {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--yx-r-md);
  background: var(--ab-ink-soft);
  border-left: 2px solid var(--yx-cyan);
}

.page-about .ab-fact__v {
  flex: 0 0 auto;
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--yx-cyan);
  letter-spacing: .02em;
}

.page-about .ab-fact__u {
  font-size: .5em;
  letter-spacing: 0;
}

.page-about .ab-fact__l {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--yx-silver);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  padding: clamp(36px, 6vw, 88px) 0 clamp(30px, 5vw, 72px);
}

.page-about .ab-body__grid {
  display: grid;
  gap: 26px;
}

/* 章节索引 */
.page-about .ab-rail__title {
  margin: 0 0 10px;
  font-family: var(--yx-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--yx-slate);
  text-transform: uppercase;
}

.page-about .ab-rail__nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.page-about .ab-rail__nav::-webkit-scrollbar {
  display: none;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 9px 16px;
  border-radius: var(--yx-pill);
  border: 1px solid var(--yx-ink-12);
  background: var(--yx-white);
  color: var(--yx-ink);
  font-size: 14px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s var(--yx-ease), color .2s var(--yx-ease), background-color .2s var(--yx-ease);
}

.page-about .ab-rail__link .yx-num {
  font-size: 12px;
  color: var(--yx-slate);
  letter-spacing: .06em;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  border-color: var(--yx-cyan);
  background: var(--yx-cyan-16);
  color: var(--yx-blue);
}

.page-about .ab-rail__link:hover .yx-num,
.page-about .ab-rail__link:focus-visible .yx-num {
  color: var(--yx-blue);
}

/* 章节通用 */
.page-about .ab-chapter {
  padding: clamp(30px, 4.4vw, 56px) 0;
  border-top: 1px solid var(--yx-ink-12);
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-chapter__head {
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .ab-chapter__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-family: var(--yx-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--yx-blue);
}

.page-about .ab-chapter__kicker .yx-num {
  color: var(--yx-orange);
  font-weight: 700;
}

.page-about .ab-chapter__title {
  margin: 0 0 14px;
  font-size: clamp(25px, 4.4vw, 42px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -.02em;
  max-width: 20ch;
}

.page-about .ab-chapter__lede {
  margin: 0;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.76;
  color: var(--yx-ink-80);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--yx-cyan), var(--yx-cyan-16) 62%, transparent);
}

.page-about .ab-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(20px, 3vw, 32px);
}

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

.page-about .ab-tl__dot {
  width: 14px;
  height: 14px;
  margin-top: 13px;
  border-radius: 50%;
  background: var(--yx-cyan);
  box-shadow: 0 0 0 5px var(--yx-cyan-16);
  justify-self: center;
  position: relative;
  z-index: 1;
}

.page-about .ab-tl__node {
  display: block;
  width: 100%;
  padding: 2px 0 0;
  border: 0;
  background: transparent;
  text-align: left;
  font-family: inherit;
  color: inherit;
  cursor: pointer;
}

.page-about .ab-tl__era {
  display: inline-block;
  margin-bottom: 9px;
  padding: 3px 11px;
  border-radius: var(--yx-pill);
  background: var(--yx-cyan-16);
  color: var(--yx-blue);
  font-family: var(--yx-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
}

.page-about .ab-tl__name {
  display: block;
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 800;
  line-height: 1.34;
  letter-spacing: -.01em;
}

.page-about .ab-tl__node:hover .ab-tl__name,
.page-about .ab-tl__node:focus-visible .ab-tl__name {
  color: var(--yx-blue);
}

.page-about .ab-tl__note {
  margin-top: 12px;
  padding: 16px 18px;
  border-radius: var(--yx-r-md);
  border: 1px solid var(--yx-ink-12);
  background: var(--yx-white);
  box-shadow: var(--yx-shadow-1);
}

.page-about .ab-tl__note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--yx-slate);
}

.page-about .ab-tl__media {
  margin: 14px 0 0;
  border-radius: var(--yx-r-sm);
  overflow: hidden;
  background: var(--yx-blue);
}

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

/* ---------- 数据四步 ---------- */
.page-about .ab-steps {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-step {
  padding: 18px 18px 20px;
  border-radius: var(--yx-r-md);
  border: 1px solid var(--yx-ink-12);
  border-top: 3px solid var(--yx-cyan);
  background: var(--yx-white);
}

.page-about .ab-step__n {
  display: block;
  font-family: var(--yx-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--yx-slate);
  margin-bottom: 10px;
}

.page-about .ab-step__t {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .ab-step__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--yx-slate);
}

.page-about .ab-split {
  display: grid;
  gap: 22px;
}

.page-about .ab-split__t {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .ab-split__text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--yx-ink-80);
  max-width: 52ch;
}

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

.page-about .ab-split__media {
  margin: 0;
  border-radius: var(--yx-r-lg);
  overflow: hidden;
  background: var(--yx-blue);
  box-shadow: var(--yx-shadow-2);
}

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

/* ---------- 栏目 ---------- */
.page-about .ab-columns {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .ab-col .yx-card__title {
  font-size: 20px;
  letter-spacing: -.01em;
}

.page-about .ab-tagbox {
  margin-top: clamp(24px, 4vw, 42px);
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--yx-r-lg);
  background: var(--yx-blue);
  color: var(--yx-paper);
}

.page-about .ab-tagbox__t {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .ab-tagbox__d {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.74;
  color: var(--yx-silver);
}

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

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 26px;
  align-items: center;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .ab-donut {
  position: relative;
  width: min(220px, 62vw);
  aspect-ratio: 1;
  margin: 0 auto;
  border-radius: 50%;
  background: conic-gradient(
    var(--yx-cyan) 0 35.3%,
    var(--yx-blue) 35.3% 61.8%,
    var(--yx-silver) 61.8% 100%
  );
  box-shadow: var(--yx-shadow-1);
}

.page-about .ab-donut__core {
  position: absolute;
  inset: 26%;
  border-radius: 50%;
  background: var(--yx-paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.page-about .ab-donut__num {
  font-size: clamp(30px, 6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--yx-ink);
}

.page-about .ab-donut__unit {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--yx-slate);
}

.page-about .ab-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-legend__item {
  display: grid;
  grid-template-columns: 12px auto minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--yx-r-sm);
  border: 1px solid var(--yx-ink-12);
  background: var(--yx-white);
}

.page-about .ab-legend__sw {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.page-about .ab-legend__sw--a { background: var(--yx-cyan); }
.page-about .ab-legend__sw--b { background: var(--yx-blue); }
.page-about .ab-legend__sw--c { background: var(--yx-silver); }

.page-about .ab-legend__n {
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--yx-ink);
}

.page-about .ab-legend__t {
  font-size: 14px;
  line-height: 1.5;
  color: var(--yx-slate);
}

.page-about .ab-shifts {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .ab-shift {
  padding: 16px 18px;
  border-radius: var(--yx-r-md);
  background: var(--yx-ink-06);
  border-left: 3px solid var(--yx-cyan);
}

.page-about .ab-shift__tag {
  margin-bottom: 10px;
}

.page-about .ab-shift__d {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--yx-ink-80);
}

/* ---------- 赛季专题 ---------- */
.page-about .ab-seasons {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .ab-season {
  padding: 18px;
  border-radius: var(--yx-r-md);
  background: var(--yx-white);
  border: 1px solid var(--yx-ink-12);
  display: flex;
  flex-direction: column;
}

.page-about .ab-season__n {
  font-family: var(--yx-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--yx-orange);
  margin-bottom: 10px;
}

.page-about .ab-season__t {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .ab-season__d {
  margin: 0 0 16px;
  flex: 1 1 auto;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--yx-slate);
}

.page-about .ab-season__axis {
  display: block;
  height: 3px;
  border-radius: 2px;
  background: var(--yx-ink-12);
  overflow: hidden;
}

.page-about .ab-season__fill {
  display: block;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--yx-cyan), var(--yx-blue));
}

.page-about .ab-season__fill--1 { width: 100%; }
.page-about .ab-season__fill--2 { width: 78%; }
.page-about .ab-season__fill--3 { width: 56%; }
.page-about .ab-season__fill--4 { width: 32%; }

.page-about .ab-season__foot {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--yx-slate);
}

.page-about .ab-season__foot a {
  color: var(--yx-blue);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--yx-cyan);
  text-underline-offset: 4px;
}

.page-about .ab-season__foot a:hover {
  color: var(--yx-orange);
}

/* ---------- 本地锚点 ---------- */
.page-about .ab-local {
  position: relative;
  background: var(--yx-ink);
  color: var(--yx-paper);
  padding: clamp(44px, 7vw, 96px) 0;
  border-radius: var(--yx-r-xl);
  overflow: hidden;
}

.page-about .ab-local::before {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -40%;
  width: min(640px, 90vw);
  aspect-ratio: 1;
  background: radial-gradient(closest-side, var(--yx-cyan-16), transparent 70%);
  pointer-events: none;
}

.page-about .ab-local__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-local__eyebrow {
  color: var(--yx-cyan);
}

.page-about .ab-local__title {
  color: var(--yx-paper);
  max-width: 22ch;
}

.page-about .ab-local__lede {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: 16.5px;
  line-height: 1.76;
  color: var(--yx-silver);
}

.page-about .ab-local__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-local__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--yx-silver);
}

.page-about .ab-local__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--yx-cyan);
}

.page-about .ab-local__media {
  margin: 0;
  border-radius: var(--yx-r-lg);
  overflow: hidden;
  box-shadow: var(--yx-shadow-3);
}

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

/* ---------- 结尾入口 ---------- */
.page-about .ab-cta {
  padding: clamp(40px, 6vw, 84px) 0 clamp(48px, 7vw, 96px);
}

.page-about .ab-cta__inner {
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--yx-r-xl);
  background: var(--yx-blue);
  color: var(--yx-paper);
}

.page-about .ab-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 800;
  letter-spacing: -.02em;
}

.page-about .ab-cta__text {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--yx-silver);
}

.page-about .ab-cta__links {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}

.page-about .ab-cta__link {
  display: block;
  padding: 16px 18px;
  border-radius: var(--yx-r-md);
  background: var(--yx-paper-16);
  border: 1px solid var(--ab-ink-line);
  text-decoration: none;
  color: var(--yx-paper);
  transition: background-color .22s var(--yx-ease), border-color .22s var(--yx-ease), transform .22s var(--yx-ease);
}

.page-about .ab-cta__link:hover,
.page-about .ab-cta__link:focus-visible {
  background: var(--yx-cyan-16);
  border-color: var(--yx-cyan);
  transform: translateY(-2px);
}

.page-about .ab-cta__linkT {
  display: block;
  margin-bottom: 6px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .ab-cta__linkD {
  display: block;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--yx-silver);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .ab-shifts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .ab-local__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }
}

@media (min-width: 940px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: end;
  }

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

@media (min-width: 1024px) {
  .page-about .ab-body__grid {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 68px);
    align-items: start;
  }

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

  .page-about .ab-rail__nav {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__link {
    width: 100%;
  }

  .page-about .ab-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 1180px) {
  .page-about .ab-tl__item {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .ab-tl__note {
    padding: 20px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cta__link,
  .page-about .ab-rail__link {
    transition: none;
  }

  .page-about .ab-cta__link:hover {
    transform: none;
  }
}