.page-about {
  --ab-gutter: 24px;
  --ab-line: rgba(30, 58, 47, .16);
  background: var(--gb-cream);
  color: var(--gb-moss);
  font-family: var(--gb-font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .gb-breadcrumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: 24px;
  padding-bottom: 46px;
}

.page-about .ab-hero__frame {
  position: relative;
  padding: 46px 22px 40px;
  background: var(--gb-paper);
  border: 1px solid var(--gb-line);
  box-shadow: var(--gb-shadow);
  overflow: hidden;
}

.page-about .ab-hero__kicker {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gb-turf);
}

.page-about .ab-hero__title {
  margin: 0;
  font-family: var(--gb-font-head);
  font-weight: 900;
  font-size: clamp(30px, 7.6vw, 60px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--gb-moss);
}

.page-about .ab-hero__lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.86;
  color: var(--gb-moss);
  opacity: .84;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .ab-hero__mark {
  position: absolute;
  right: 14px;
  top: 8px;
  font-size: 66px;
  font-weight: 700;
  line-height: 1;
  color: var(--gb-wood);
  opacity: .13;
  pointer-events: none;
}

.page-about .ab-hero__note {
  position: absolute;
  right: 8px;
  bottom: 16px;
  color: var(--gb-line);
  display: none;
}

@media (min-width: 720px) {
  .page-about .ab-hero__frame { padding: 60px 48px 54px; }
}

@media (min-width: 1024px) {
  .page-about .ab-hero__note { display: block; }
  .page-about .ab-hero__frame { padding: 76px 72px 66px; }
  .page-about .ab-hero__lead { font-size: 16px; }
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding-top: 50px;
  padding-bottom: 50px;
}

.page-about .ab-chapter + .ab-chapter,
.page-about .ab-stats,
.page-about .ab-next {
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

@media (min-width: 900px) {
  .page-about .ab-grid {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 56px;
  }
}

/* ---------- 窄栏 ---------- */
.page-about .ab-aside {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-aside__num {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gb-turf);
}

.page-about .ab-aside__year {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--gb-wood);
  letter-spacing: .01em;
}

.page-about .ab-aside__note {
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--gb-line);
}

@media (min-width: 900px) {
  .page-about .ab-aside {
    flex-direction: column;
    align-items: flex-start;
    flex-wrap: nowrap;
    gap: 12px;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--ab-line);
    padding-left: 18px;
    position: sticky;
    top: 28px;
  }
  .page-about .ab-aside__note {
    writing-mode: vertical-rl;
    letter-spacing: .28em;
  }
}

/* ---------- 正文排版 ---------- */
.page-about .ab-body {
  min-width: 0;
}

.page-about .ab-h2 {
  margin: 0 0 20px;
  font-family: var(--gb-font-head);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.26;
  letter-spacing: -0.005em;
  color: var(--gb-moss);
}

.page-about .ab-lead {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.86;
  color: var(--gb-moss);
  opacity: .86;
}

.page-about .ab-prose p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.88;
  color: var(--gb-moss);
  opacity: .88;
}

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

.page-about .ab-body > p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.88;
  color: var(--gb-moss);
  opacity: .88;
}

.page-about .ab-note-inline {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gb-lime);
  font-size: 13px;
  line-height: 1.8;
  color: var(--gb-wood);
  max-width: 34em;
}

/* ---------- 双栏 ---------- */
.page-about .ab-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

@media (min-width: 1024px) {
  .page-about .ab-cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
    gap: 48px;
    align-items: start;
  }
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--gb-paper);
  border: 1px solid var(--ab-line);
}

.page-about .ab-figure--wide img {
  aspect-ratio: 21 / 9;
}

.page-about .ab-figure--banner {
  margin-top: 34px;
}

.page-about .ab-figure--banner img {
  aspect-ratio: 12 / 5;
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--gb-line);
}

.page-about .ab-figure--wide {
  margin-top: 32px;
}

/* ---------- 赛事线列表 ---------- */
.page-about .ab-lines {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-lines li {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-lines__txt {
  font-size: 14px;
  line-height: 1.82;
  color: var(--gb-moss);
  opacity: .86;
}

@media (min-width: 720px) {
  .page-about .ab-lines li {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: baseline;
    gap: 22px;
  }
}

/* ---------- 班次卡 ---------- */
.page-about .ab-shifts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 700px) {
  .page-about .ab-shifts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1100px) {
  .page-about .ab-shifts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .ab-shift {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--gb-paper);
  border: 1px solid var(--ab-line);
  border-top: 3px solid var(--gb-turf);
  box-shadow: var(--gb-shadow);
}

.page-about .ab-shift--amber { border-top-color: var(--gb-amber); }
.page-about .ab-shift--red { border-top-color: var(--gb-red); }

.page-about .ab-shift__time {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--gb-moss);
}

.page-about .ab-shift__label {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gb-turf);
}

.page-about .ab-shift__desc {
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.76;
  color: var(--gb-moss);
  opacity: .78;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-foldall {
  margin: 24px 0 0;
}

.page-about .ab-foldall__btn {
  display: inline-block;
  padding: 7px 16px;
  font-family: inherit;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gb-turf);
  background: transparent;
  border: 1px solid var(--gb-turf);
  cursor: pointer;
  transition: background 240ms var(--gb-ease), color 240ms var(--gb-ease);
}

.page-about .ab-foldall__btn:hover {
  background: var(--gb-turf);
  color: var(--gb-paper);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  position: relative;
}

@media (min-width: 900px) {
  .page-about .ab-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
    padding-top: 28px;
  }
  .page-about .ab-timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 8px;
    height: 1px;
    background: var(--gb-edge-strong);
  }
}

.page-about .ab-tl {
  position: relative;
  min-width: 0;
  padding-left: 18px;
  border-left: 1px solid var(--ab-line);
}

@media (min-width: 900px) {
  .page-about .ab-tl {
    padding-left: 0;
    border-left: 0;
  }
}

.page-about .ab-tl__dot {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gb-turf);
  box-shadow: 0 0 0 2px var(--gb-cream);
}

@media (min-width: 900px) {
  .page-about .ab-tl__dot {
    left: 0;
    top: -24px;
    box-shadow: 0 0 0 2px var(--gb-cream), 0 0 0 3px var(--gb-turf);
    background: var(--gb-amber);
  }
}

.page-about .ab-tl__when {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gb-line);
}

.page-about .ab-tl__title {
  margin: 0;
  font-family: var(--gb-font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--gb-moss);
}

/* ---------- 折叠组件 ---------- */
.page-about .ab-fold__btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 12px;
  padding: 0 0 3px;
  font-family: inherit;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--gb-turf);
  background: none;
  border: 0;
  border-bottom: 1px solid var(--gb-edge-strong);
  cursor: pointer;
  transition: color 240ms var(--gb-ease);
}

.page-about .ab-fold__btn:hover { color: var(--gb-amber); }

.page-about .ab-fold__sign {
  position: relative;
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
}

.page-about .ab-fold__sign::before,
.page-about .ab-fold__sign::after {
  content: "";
  position: absolute;
  background: currentColor;
}

.page-about .ab-fold__sign::before {
  left: 0;
  top: 4px;
  width: 9px;
  height: 1px;
}

.page-about .ab-fold__sign::after {
  left: 4px;
  top: 0;
  width: 1px;
  height: 9px;
  transition: transform 280ms var(--gb-ease), opacity 280ms var(--gb-ease);
}

.page-about .ab-fold__btn[aria-expanded="true"] .ab-fold__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ab-fold__panel {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--gb-lime);
}

.page-about .ab-fold__panel[hidden] { display: none; }

.page-about .ab-fold__body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.84;
  color: var(--gb-moss);
  opacity: .82;
}

/* ---------- 纠错步骤 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  background: var(--gb-paper);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--gb-turf);
}

.page-about .ab-step__no {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gb-turf);
  padding-top: 2px;
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gb-moss);
  opacity: .86;
}

.page-about .ab-body .gb-btn {
  margin-top: 22px;
}

/* ---------- 数字看板 ---------- */
.page-about .ab-stats {
  padding-top: 50px;
  padding-bottom: 56px;
}

.page-about .ab-stat-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

@media (min-width: 900px) {
  .page-about .ab-stat-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 18px;
  background: var(--gb-paper);
  outline: none;
  transition: background 240ms var(--gb-ease);
}

.page-about .ab-stat:focus-visible {
  box-shadow: inset 0 0 0 2px var(--gb-amber);
}

.page-about .ab-stat__num {
  font-size: clamp(30px, 6.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gb-moss);
}

.page-about .ab-stat__unit {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gb-wood);
}

.page-about .ab-stat__range {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--ab-line);
  font-size: 12px;
  line-height: 1.72;
  color: var(--gb-line);
}

@media (min-width: 900px) {
  .page-about .ab-stat__range {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
    overflow: hidden;
    transition: max-height 300ms var(--gb-ease), opacity 300ms var(--gb-ease),
                margin-top 300ms var(--gb-ease), padding-top 300ms var(--gb-ease);
  }
  .page-about .ab-stat:hover .ab-stat__range,
  .page-about .ab-stat:focus-visible .ab-stat__range {
    max-height: 6em;
    margin-top: 8px;
    padding-top: 8px;
    border-top-color: var(--ab-line);
    opacity: 1;
  }
}

/* ---------- 结尾导航 ---------- */
.page-about .ab-next {
  padding-top: 46px;
  padding-bottom: 60px;
}

.page-about .ab-next__h {
  margin: 0 0 22px;
  font-family: var(--gb-font-head);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--gb-moss);
}

.page-about .ab-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

@media (min-width: 760px) {
  .page-about .ab-next__list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.page-about .ab-next__list li { background: var(--gb-paper); }

.page-about .ab-next__list a {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 12px;
  row-gap: 6px;
  padding: 20px 18px;
  text-decoration: none;
  color: inherit;
  transition: background 220ms var(--gb-ease);
}

.page-about .ab-next__list a:hover,
.page-about .ab-next__list a:focus-visible {
  background: rgba(143, 191, 107, .12);
}

.page-about .ab-next__no {
  grid-row: 1 / span 2;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gb-turf);
  padding-top: 3px;
}

.page-about .ab-next__t {
  font-weight: 800;
  font-size: 16px;
  color: var(--gb-moss);
}

.page-about .ab-next__d {
  font-size: 13px;
  line-height: 1.74;
  color: var(--gb-moss);
  opacity: .74;
}

/* ---------- 动效收敛 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-fold__sign::after,
  .page-about .ab-stat,
  .page-about .ab-stat__range,
  .page-about .ab-next__list a,
  .page-about .ab-foldall__btn,
  .page-about .ab-fold__btn {
    transition: none !important;
  }
}
</main>