.page-about {
  --ab-line: 2px solid var(--line);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
  padding-top: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .ab-hero h1 {
  margin: 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 5.6vw, 64px);
  line-height: 1.05;
  letter-spacing: 0.015em;
  color: var(--paper);
}

.page-about .ab-hero__accent {
  color: var(--track);
  position: relative;
  white-space: nowrap;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 40em;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: rgba(233, 245, 241, 0.86);
}

.page-about .ab-stats {
  list-style: none;
  margin: clamp(6px, 1vw, 14px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: var(--ab-line);
  background: linear-gradient(120deg, rgba(31, 216, 164, 0.1), rgba(5, 38, 28, 0) 60%);
}

.page-about .ab-stat {
  display: grid;
  gap: 6px;
  padding: clamp(14px, 1.6vw, 22px);
  border-right: var(--ab-line);
}

.page-about .ab-stat:last-child {
  border-right: 0;
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--score);
}

.page-about .ab-stat__label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .ab-hero__visual {
  margin: 0 0 clamp(26px, 4vw, 52px);
  aspect-ratio: 16 / 7;
}

.page-about .ab-hero__visual img,
.page-about .ab-team__fig img,
.page-about .ab-partners__fig img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 骨架 ---------- */
.page-about .ab-shell {
  align-items: start;
}

.page-about .ab-flow {
  display: grid;
  gap: clamp(38px, 5vw, 80px);
  min-width: 0;
}

.page-about .ab-sec {
  display: grid;
  gap: clamp(14px, 1.8vw, 22px);
  min-width: 0;
}

.page-about .ab-h {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  color: var(--paper);
}

/* ---------- 年份轨道 ---------- */
.page-about .ab-rail {
  display: grid;
  gap: 14px;
  align-content: start;
  padding-right: clamp(14px, 1.6vw, 24px);
}

.page-about .ab-rail__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--slate);
}

.page-about .ab-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .ab-rail a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 9px 10px;
  border-left: 2px solid var(--line-soft);
  color: var(--paper);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.05em;
  transition: border-color 0.16s ease, background-color 0.16s ease, color 0.16s ease;
}

.page-about .ab-rail__y {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--track);
}

.page-about .ab-rail a:hover {
  border-left-color: var(--track);
  background: var(--track-glow);
  color: var(--track-hi);
}

.page-about .ab-rail a:focus-visible {
  outline: 2px solid var(--track-hi);
  outline-offset: 2px;
  border-left-color: var(--track);
  background: var(--track-glow);
}

.page-about .ab-rail__note {
  justify-self: start;
  margin-top: 6px;
  color: var(--slate);
  opacity: 0.75;
}

/* ---------- 历程长条卡 ---------- */
.page-about .ab-timeline {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
}

.page-about .ab-timeline .ab-stage {
  margin-top: clamp(8px, 1.4vw, 18px);
}

.page-about .ab-stage {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 26px);
  padding: clamp(20px, 2.6vw, 34px);
  background: var(--ink-2);
  border: var(--ab-line);
  box-shadow: var(--shadow-brut);
  scroll-margin-top: calc(var(--masthead-h) + 28px);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .ab-stage:hover {
  border-color: var(--track);
  box-shadow: var(--shadow-hot);
}

.page-about .ab-stage__year {
  display: grid;
  gap: 8px;
  align-content: start;
  font-family: var(--font-mono);
}

.page-about .ab-stage__num {
  font-size: clamp(40px, 5.6vw, 68px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--track);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .ab-stage__num {
    color: transparent;
    -webkit-text-stroke: 2px var(--track);
  }
}

.page-about .ab-stage__mark {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .ab-stage__body {
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
}

.page-about .ab-stage__body .tag {
  justify-self: start;
}

.page-about .ab-stage__body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 24px);
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .ab-stage__body .prose a {
  color: var(--track-hi);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* ---------- 团队分工 ---------- */
.page-about .ab-pipe {
  margin-top: clamp(6px, 1vw, 12px);
  padding: clamp(12px, 1.6vw, 22px);
  border: var(--ab-line);
  background: linear-gradient(90deg, rgba(22, 50, 63, 0.92), rgba(5, 38, 28, 0.92));
}

.page-about .ab-pipe svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-team__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 34px);
  align-items: start;
}

.page-about .ab-team__fig {
  margin: 0;
  aspect-ratio: 4 / 3;
  border-color: var(--line);
}

.page-about .ab-team__list {
  display: grid;
  gap: clamp(12px, 1.6vw, 18px);
  align-content: start;
  min-width: 0;
}

.page-about .ab-role {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 1.8vw, 24px);
  background: var(--mist);
  border: var(--ab-line);
  border-left: 6px solid var(--track);
  transition: border-left-color 0.16s ease, background-color 0.16s ease;
}

.page-about .ab-role:hover {
  border-left-color: var(--score);
  background: var(--ink-2);
}

.page-about .ab-role__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ab-role__top h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 1.6vw, 19px);
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .ab-role__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1;
  color: var(--score);
}

.page-about .ab-role__num small {
  margin-left: 3px;
  font-size: 12px;
  color: var(--slate);
  letter-spacing: 0.1em;
}

.page-about .ab-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(233, 245, 241, 0.84);
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2vw, 28px);
  padding: clamp(20px, 2.6vw, 34px);
  background: linear-gradient(150deg, var(--ink-2), var(--mist) 72%);
  border: 2px solid var(--track);
  box-shadow: var(--shadow-hot);
}

.page-about .ab-tick {
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .ab-tick__num {
  font-family: var(--font-mono);
  font-size: clamp(48px, 7vw, 86px);
  line-height: 0.92;
  letter-spacing: -0.04em;
  color: var(--score);
}

.page-about .ab-tick__unit {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: rgba(233, 245, 241, 0.72);
}

.page-about .ab-board__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 1.9vw, 22px);
  letter-spacing: 0.03em;
  color: var(--paper);
}

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

.page-about .ab-sports li {
  padding: 6px 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--track-hi);
  border: 1px solid var(--track);
  background: var(--track-glow);
}

.page-about .ab-board__foot {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: clamp(12px, 1.6vw, 20px);
  padding-top: clamp(14px, 1.8vw, 22px);
  border-top: var(--ab-line);
}

.page-about .ab-fact {
  display: grid;
  gap: 6px;
}

.page-about .ab-fact__k {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .ab-fact__v {
  font-family: var(--font-mono);
  font-size: clamp(17px, 1.6vw, 21px);
  color: var(--paper);
}

/* ---------- 赛季专题与合作 ---------- */
.page-about .ab-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 34px);
  align-items: start;
}

.page-about .ab-partners__text {
  display: grid;
  gap: 16px;
  align-content: start;
  min-width: 0;
}

.page-about .ab-partners__text .btn {
  justify-self: start;
}

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

.page-about .ab-facts li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 12px 14px;
  background: var(--ink-2);
  border: var(--ab-line);
  font-size: 15px;
  line-height: 1.65;
  color: rgba(233, 245, 241, 0.86);
}

.page-about .ab-facts b {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 20px;
  color: var(--score);
}

.page-about .ab-partners__fig {
  margin: 0;
  aspect-ratio: 1 / 1;
  border-color: var(--line);
}

/* ---------- 服务支持 ---------- */
.page-about .ab-support__panel {
  display: grid;
  gap: 16px;
  padding: clamp(22px, 3vw, 42px);
}

.page-about .ab-support__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .ab-stage {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
  }

  .page-about .ab-stage:nth-child(even) {
    margin-left: clamp(0px, 3vw, 44px);
  }

  .page-about .ab-board {
    grid-template-columns: minmax(160px, 0.8fr) minmax(0, 1.6fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ab-team__cols {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (max-width: 1024px) {
  .page-about .ab-rail {
    position: static;
    border-right: 0;
    border-bottom: var(--ab-line);
    padding: 0 0 14px;
  }

  .page-about .ab-rail ol {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .page-about .ab-rail a {
    border-left: 0;
    border-top: 2px solid var(--line-soft);
    grid-template-columns: auto auto;
    white-space: nowrap;
  }

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

@media (max-width: 640px) {
  .page-about .ab-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-stat {
    border-right: 0;
    border-bottom: var(--ab-line);
  }

  .page-about .ab-stat:last-child {
    border-bottom: 0;
  }

  .page-about .ab-hero__accent {
    white-space: normal;
  }

  .page-about .ab-stage:hover {
    box-shadow: var(--shadow-brut);
  }

  .page-about .ab-board {
    box-shadow: 4px 4px 0 var(--score-glow);
  }
}