.page-about {
  --ab-muted: #5C6068;
  --ab-rail-w: 188px;
  --ab-sec-gap: clamp(38px, 6vw, 76px);
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(115% 85% at 82% 6%, rgba(228, 180, 76, 0.2) 0%, rgba(228, 180, 76, 0) 58%),
    linear-gradient(158deg, #0A111F 0%, #16233A 62%, #0A111F 100%);
  color: var(--bone);
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(56px, 8vw, 96px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 52px), calc(100% - 52px) 100%, 0 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 16%;
  height: 1px;
  background: linear-gradient(90deg,
    rgba(228, 180, 76, 0) 0%,
    rgba(228, 180, 76, 0.5) 22%,
    rgba(185, 255, 75, 0.22) 62%,
    rgba(228, 180, 76, 0) 100%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero .sf-crumbs,
.page-about .ab-hero .sf-crumbs a {
  color: var(--haze);
}
.page-about .ab-hero .sf-crumbs a {
  text-decoration: none;
}
.page-about .ab-hero .sf-crumbs a:hover,
.page-about .ab-hero .sf-crumbs a:focus-visible {
  color: var(--neon);
}

.page-about .ab-hero__kicker {
  margin: clamp(18px, 3vw, 30px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 6vw, 64px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--bone);
  max-width: 20ch;
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: #C7D0DE;
  max-width: 62ch;
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4vw, 48px) 0 0;
  background: rgba(134, 152, 179, 0.24);
  border: 1px solid rgba(134, 152, 179, 0.24);
}

.page-about .ab-figures__cell {
  background: rgba(10, 17, 31, 0.62);
  padding: 16px 18px 18px;
}

.page-about .ab-figures dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--haze);
}

.page-about .ab-figures dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .ab-figures__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 30px);
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .ab-figures dd em {
  font-style: normal;
  font-size: 12px;
  color: var(--haze);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  padding: clamp(46px, 7vw, 100px) 0 clamp(56px, 9vw, 116px);
}

.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 60px);
}

/* ---------- 章节刻度轨道 ---------- */
.page-about .ab-rail {
  display: none;
}

.page-about .ab-rail__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--haze);
}

.page-about .ab-rail__list {
  display: grid;
  gap: 2px;
}

.page-about .ab-rail__stop {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 6px;
  padding: 9px 0;
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  color: var(--gold-deep);
  transition: color 0.22s var(--ease);
}

.page-about .ab-rail__stop::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -4.5px;
  border-radius: 50%;
  background: var(--paper);
  border: 1.5px solid var(--rule);
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .ab-rail__stop[data-active] {
  color: var(--text);
  font-weight: 700;
}

.page-about .ab-rail__stop[data-active]::before {
  background: var(--neon);
  border-color: var(--gold);
  transform: scale(1.35);
}

.page-about .ab-rail__stop:hover::before,
.page-about .ab-rail__stop:focus-visible::before {
  border-color: var(--gold);
}

.page-about .ab-rail__stop:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .ab-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--haze);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-sec {
  scroll-margin-top: 104px;
}

.page-about .ab-sec + .ab-sec::before {
  content: "";
  display: block;
  height: 1px;
  margin: var(--ab-sec-gap) 0;
  background: linear-gradient(90deg,
    var(--gold) 0%,
    rgba(228, 180, 76, 0.28) 16%,
    var(--rule) 52%,
    rgba(216, 210, 198, 0) 100%);
}

.page-about .ab-sec__head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .ab-sec__no {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-deep);
}

.page-about .ab-sec__no::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.page-about .ab-sec__title {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--text);
  max-width: 26ch;
}

.page-about .ab-sec__lede {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ab-muted);
  max-width: 62ch;
}

/* ---------- 图文错位 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 44px);
  align-items: start;
}

.page-about .ab-split__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
  max-width: 64ch;
}

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

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

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

.page-about .ab-ticks {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 11px;
}

.page-about .ab-ticks li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-muted);
}

.page-about .ab-ticks__val {
  flex: none;
  min-width: 54px;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--gold-deep);
}

/* ---------- 数据账本 ---------- */
.page-about .ab-ledger {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .ab-ledger__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 22px;
  background: var(--bone);
}

.page-about .ab-ledger__num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.9vw, 30px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-ledger__num em {
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  color: var(--gold-deep);
  margin-left: 4px;
  letter-spacing: 0;
}

.page-about .ab-ledger__cap {
  font-size: 13px;
  line-height: 1.65;
  color: var(--ab-muted);
}

.page-about .ab-note {
  margin-top: 24px;
  padding-left: 18px;
  border-left: 2px solid var(--gold);
  display: grid;
  gap: 10px;
}

.page-about .ab-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-muted);
  max-width: 66ch;
}

/* ---------- 生产流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .ab-steps__item {
  position: relative;
  padding: 0 0 24px 46px;
}

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

.page-about .ab-steps__item::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 32px;
  bottom: 4px;
  width: 1px;
  background: var(--rule);
}

.page-about .ab-steps__item:last-child::after {
  display: none;
}

.page-about .ab-steps__no {
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  background: var(--gold);
  clip-path: var(--btn-cut);
}

.page-about .ab-steps__title {
  margin: 3px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .ab-steps__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-muted);
  max-width: 56ch;
}

/* ---------- 比分与伤停 ---------- */
.page-about .ab-rules {
  display: grid;
  gap: 16px;
}

.page-about .ab-rule {
  background: var(--bone);
  border: 1px solid var(--rule);
  padding: 22px 20px 24px;
  clip-path: var(--cut-path);
}

.page-about .ab-rule__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .ab-rule p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-muted);
}

.page-about .ab-status {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-status__item {
  padding: 7px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  clip-path: var(--btn-cut);
  background: var(--ink-2);
  color: var(--bone);
}

.page-about .ab-status__item--start {
  background: var(--ink-2);
  color: var(--neon);
}

.page-about .ab-status__item--out {
  background: var(--live);
  color: #FFF6F2;
}

.page-about .ab-status__item--susp {
  background: var(--gold);
  color: var(--ink);
}

.page-about .ab-status__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ab-muted);
}

/* ---------- 辽宁基地 ---------- */
.page-about .ab-wide {
  margin: 0 0 clamp(22px, 3.5vw, 36px);
}

.page-about .ab-two-col {
  display: grid;
  gap: 16px;
}

.page-about .ab-two-col p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 16px;
}

.page-about .ab-partner {
  background: var(--bone);
  padding: 24px 20px 26px;
  clip-path: var(--cut-path);
  box-shadow: inset 0 3px 0 var(--gold);
}

.page-about .ab-partner__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-muted);
}

.page-about .ab-honor {
  position: relative;
  margin: 26px 0 0;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .ab-honor::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 10px;
  background: var(--gold);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

/* ---------- 收尾入口 ---------- */
.page-about .ab-next {
  background:
    radial-gradient(90% 130% at 12% 0%, rgba(185, 255, 75, 0.12) 0%, rgba(185, 255, 75, 0) 55%),
    var(--ink);
  color: var(--bone);
  padding: clamp(46px, 7vw, 84px) 0;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 40px 100%, 0 calc(100% - 40px));
}

.page-about .ab-next__inner {
  display: grid;
  gap: 24px;
}

.page-about .ab-next__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--neon);
}

.page-about .ab-next__title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 34px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--bone);
  max-width: 22ch;
}

.page-about .ab-next__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
}

.page-about .ab-next__link {
  color: var(--bone);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid var(--neon);
  padding-bottom: 2px;
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  color: var(--neon);
}

.page-about .ab-next__link:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 4px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
  }

  .page-about .ab-split--media-first {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.32fr);
  }

  .page-about .ab-media--left {
    transform: rotate(-1.3deg);
  }

  .page-about .ab-media--right {
    transform: rotate(1.2deg);
  }

  .page-about .ab-two-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 34px;
  }

  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-about .ab-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 820px) {
  .page-about .ab-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-rule:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .ab-rule:nth-child(3) {
    transform: translateY(32px);
  }

  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(42px, 5vw, 78px);
  }

  .page-about .ab-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: 108px;
    padding-left: 15px;
    border-left: 1px solid var(--rule);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-media--left,
  .page-about .ab-media--right,
  .page-about .ab-rule:nth-child(2),
  .page-about .ab-rule:nth-child(3) {
    transform: none;
  }
}