.page-about {
  background: var(--pitch);
  color: var(--white);
  overflow-x: clip;
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-about .eyebrow {
  color: var(--lemon);
  letter-spacing: .16em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(40px, 7vw, 78px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  align-items: center;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.015em;
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 33em;
  font-size: clamp(16px, 1.7vw, 17.5px);
  line-height: 1.75;
  color: rgba(255, 255, 255, .88);
}

.page-about .ab-hero__sub {
  margin: 16px 0 0;
  max-width: 33em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* 比分牌视觉 */
.page-about .ab-board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--r-l);
  border: 1px solid rgba(228, 255, 77, .22);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(47, 168, 255, .16), transparent 60%),
    linear-gradient(160deg, rgba(30, 107, 79, .6), rgba(6, 32, 25, .94));
  box-shadow: var(--shadow-2);
  overflow: hidden;
}

.page-about .ab-board::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .055) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}

.page-about .ab-board__cell {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  border-radius: var(--r-m);
  border: 1px solid var(--mid);
  background: rgba(6, 32, 25, .78);
}

.page-about .ab-board__cell--b {
  transform: translateY(14px) rotate(var(--skew-b));
}

.page-about .ab-board__cell--c {
  grid-column: 1 / -1;
  transform: rotate(var(--skew-a));
  background: rgba(11, 61, 46, .9);
}

.page-about .ab-board__num {
  font-size: clamp(28px, 5.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--lemon);
}

.page-about .ab-board__lab {
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--mist);
}

.page-about .ab-board__net {
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  border: 1px solid rgba(228, 255, 77, .18);
  background-image:
    linear-gradient(rgba(228, 255, 77, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(228, 255, 77, .12) 1px, transparent 1px);
  background-size: 16px 16px;
  opacity: .7;
  pointer-events: none;
}

/* ---------- 通用区块头 ---------- */
.page-about .ab-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .ab-sec-head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .ab-sec-lede {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* 纸面区块 */
.page-about .ab-rail,
.page-about .ab-team,
.page-about .ab-youth {
  background: var(--paper);
  color: var(--pitch);
  border-radius: var(--r-l);
  margin-inline: clamp(0px, 2vw, 22px);
  padding: clamp(34px, 6vw, 76px) 0;
}

.page-about .ab-rail .eyebrow,
.page-about .ab-team .eyebrow,
.page-about .ab-youth .eyebrow {
  color: var(--mid);
}

.page-about .ab-rail .ab-sec-lede,
.page-about .ab-team .ab-sec-lede,
.page-about .ab-youth .ab-sec-lede {
  color: #3E5A4E;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-rail__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-rail__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
}

.page-about .ab-rail__list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--mid), rgba(30, 107, 79, .12));
}

.page-about .ab-rail__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .ab-rail__item:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 6px;
  border-radius: var(--r-s);
}

.page-about .ab-rail__dot {
  position: absolute;
  left: -34px;
  top: 5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--lemon);
  border: 3px solid var(--paper);
  box-shadow: 0 0 0 2px var(--mid);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .ab-rail__item:hover .ab-rail__dot,
.page-about .ab-rail__item:focus-within .ab-rail__dot {
  transform: scale(1.18);
  box-shadow: 0 0 0 2px var(--pitch), 0 0 0 6px rgba(228, 255, 77, .35);
}

.page-about .ab-rail__stage {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mid);
  text-transform: uppercase;
}

.page-about .ab-rail__title {
  margin: 6px 0 0;
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.35;
  font-weight: 800;
}

.page-about .ab-rail__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #34503F;
  max-width: 46ch;
}

.page-about .ab-rail__extra {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .4s var(--ease), opacity .35s var(--ease), margin-top .35s var(--ease);
}

.page-about .ab-rail__extra .chip {
  margin-right: 8px;
}

.page-about .ab-rail__extra p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: #4B6559;
  max-width: 46ch;
}

.page-about .ab-rail__item:hover .ab-rail__extra,
.page-about .ab-rail__item:focus-within .ab-rail__extra {
  max-height: 260px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .ab-rail__side {
  display: grid;
  gap: 20px;
}

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

.page-about .ab-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--r-m);
  border: 1px solid rgba(11, 61, 46, .18);
  box-shadow: var(--shadow-1);
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: #4B6559;
}

.page-about .ab-rail__tally {
  border-radius: var(--r-m);
  border: 1px solid rgba(11, 61, 46, .16);
  background: #FFFFFF;
  padding: 20px;
  box-shadow: var(--shadow-1);
}

.page-about .ab-rail__tally-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mid);
}

.page-about .ab-rail__tally-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 14.5px;
  color: #234134;
}

.page-about .ab-rail__tally-list .mono {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--pitch);
  letter-spacing: .04em;
  margin-right: 6px;
}

/* ---------- 窄数据带 ---------- */
.page-about .ab-band {
  margin: clamp(28px, 5vw, 56px) 0;
  padding: clamp(26px, 4vw, 42px) 0;
  background: var(--pitch-deep);
  border-block: 1px solid var(--mid);
}

.page-about .ab-band__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
}

.page-about .ab-band__item {
  transition: opacity .45s var(--ease), transform .45s var(--ease);
}

.page-about .ab-band__item:nth-child(2) { transition-delay: .06s; }
.page-about .ab-band__item:nth-child(3) { transition-delay: .12s; }
.page-about .ab-band__item:nth-child(4) { transition-delay: .18s; }
.page-about .ab-band__item:nth-child(5) { transition-delay: .24s; }
.page-about .ab-band__item:nth-child(6) { transition-delay: .3s; }

.page-about .ab-band__num {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--lemon);
}

.page-about .ab-band__lab {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 三步流程 ---------- */
.page-about .ab-flow {
  padding-block: clamp(34px, 6vw, 84px);
}

.page-about .ab-flow__grid {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
  align-items: start;
}

.page-about .ab-flow__text h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .ab-flow__lede {
  margin: 14px 0 22px;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .86);
}

.page-about .ab-step {
  border: 1px solid var(--mid);
  border-left: 3px solid var(--mid);
  border-radius: var(--r-m);
  background: rgba(6, 32, 25, .62);
  margin-top: 12px;
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .ab-step[open] {
  border-left-color: var(--lemon);
  background: rgba(6, 32, 25, .85);
}

.page-about .ab-step:hover {
  transform: translateY(-2px);
}

.page-about .ab-step summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16.5px, 2vw, 19px);
  font-weight: 800;
  color: var(--white);
}

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

.page-about .ab-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--lemon);
}

.page-about .ab-step[open] summary::after {
  content: "−";
}

.page-about .ab-step__idx {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--lemon);
}

.page-about .ab-step__body {
  padding: 0 18px 18px 18px;
}

.page-about .ab-step__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .84);
}

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

.page-about .ab-flow__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--r-m);
  border: 1px solid var(--mid);
  box-shadow: var(--shadow-2);
}

.page-about .ab-flow__cap {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: 18px;
}

.page-about .ab-team__card {
  background: #FFFFFF;
  border: 1px solid rgba(11, 61, 46, .14);
  border-radius: var(--r-m);
  padding: 24px 22px 26px;
  box-shadow: var(--shadow-1);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .ab-team__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .ab-team__num {
  margin: 0;
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--pitch);
  border-bottom: 3px solid var(--lemon);
  display: inline-block;
  padding-bottom: 6px;
}

.page-about .ab-team__title {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 800;
}

.page-about .ab-team__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #34503F;
}

/* ---------- 阵容 / 梯队 对比 ---------- */
.page-about .ab-duo {
  padding-block: clamp(34px, 6vw, 84px);
}

.page-about .ab-duo__grid {
  display: grid;
  gap: 18px;
}

.page-about .ab-duo__card {
  border: 1px solid var(--mid);
  border-radius: var(--r-m);
  background: rgba(6, 32, 25, .55);
  padding: 24px 22px 26px;
  transition: transform .3s var(--ease);
}

.page-about .ab-duo__card:hover {
  transform: translateY(-2px);
}

.page-about .ab-duo__card--red {
  border-top: 4px solid var(--red);
}

.page-about .ab-duo__card--blue {
  border-top: 4px solid var(--blue);
}

.page-about .ab-duo__title {
  margin: 16px 0 0;
  font-size: clamp(19px, 2.6vw, 23px);
  line-height: 1.35;
  font-weight: 800;
}

.page-about .ab-duo__desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .84);
}

.page-about .ab-duo__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-duo__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-duo__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--lemon);
}

/* ---------- 青训合作 ---------- */
.page-about .ab-youth__figure {
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .ab-youth__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--r-m);
  border: 1px solid rgba(11, 61, 46, .16);
  box-shadow: var(--shadow-1);
}

.page-about .ab-youth__points {
  display: grid;
  gap: 18px;
}

.page-about .ab-youth__point {
  border-left: 3px solid var(--mid);
  padding-left: 16px;
}

.page-about .ab-youth__point-title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
}

.page-about .ab-youth__point p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #34503F;
}

/* ---------- 收束面板 ---------- */
.page-about .ab-close {
  padding-block: clamp(40px, 7vw, 96px);
}

.page-about .ab-close__panel {
  display: grid;
  gap: 28px;
  padding: clamp(26px, 4.4vw, 52px);
  border-radius: var(--r-l);
  border: 1px solid var(--mid);
  background:
    radial-gradient(110% 80% at 0% 100%, rgba(30, 107, 79, .55), transparent 62%),
    linear-gradient(150deg, var(--pitch-deep), #0B3D2E);
  box-shadow: var(--shadow-2);
}

.page-about .ab-close__text h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 3.8vw, 34px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about .ab-close__text p {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .86);
}

.page-about .ab-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .ab-close__link {
  flex-basis: 100%;
  font-size: 15px;
  color: var(--lemon);
}

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

  .page-about .ab-team__card:nth-child(2) {
    transform: translateY(20px);
  }

  .page-about .ab-team__card:nth-child(2):hover {
    transform: translateY(14px);
  }

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

  .page-about .ab-youth__points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .ab-rail__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .9fr);
    gap: clamp(32px, 4.5vw, 60px);
  }

  .page-about .ab-rail__side {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

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

  .page-about .ab-duo__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .ab-duo__card--blue {
    transform: translateY(18px);
  }

  .page-about .ab-duo__card--blue:hover {
    transform: translateY(14px);
  }

  .page-about .ab-band__row {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-close__panel {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: center;
  }

  .page-about .ab-close__link {
    flex-basis: auto;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (hover: none) {
  .page-about .ab-rail__extra {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__dot,
  .page-about .ab-rail__extra,
  .page-about .ab-band__item,
  .page-about .ab-step,
  .page-about .ab-team__card,
  .page-about .ab-duo__card {
    transition: none;
  }

  .page-about .ab-board__cell--b,
  .page-about .ab-board__cell--c,
  .page-about .ab-team__card:nth-child(2),
  .page-about .ab-team__card:nth-child(2):hover,
  .page-about .ab-duo__card--blue,
  .page-about .ab-duo__card--blue:hover {
    transform: none;
  }

  .page-about .ab-rail__item:hover .ab-rail__dot,
  .page-about .ab-rail__item:focus-within .ab-rail__dot {
    transform: none;
  }
}