.page-about {
  background: var(--qy-deep);
  color: var(--qy-paper);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(20px, 4vw, 44px) clamp(36px, 6vw, 84px);
}
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(16px, 3vw, 30px);
}
.page-about .ab-hero__copy {
  min-width: 0;
}
.page-about .ab-hero h1 {
  margin: 0.18em 0 0.45em;
}
.page-about .ab-hero__facts {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 15px;
}
.page-about .ab-hero__facts li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  color: rgba(245, 241, 232, 0.82);
}
.page-about .ab-hero__facts li::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  background: var(--qy-orange);
  transform: translateY(-3px);
}
.page-about .ab-hero__facts b {
  font-family: var(--qy-mono);
  font-weight: 700;
  color: var(--qy-orange-soft);
}
.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .ab-hero__media {
  margin: 0;
}

/* ---------- 历程时间线 ---------- */
.page-about .ab-history {
  color: var(--qy-ink);
}
.page-about .ab-history__head {
  max-width: 60ch;
  margin-bottom: clamp(26px, 4vw, 46px);
}
.page-about .ab-rail {
  min-width: 0;
}
.page-about .ab-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}
.page-about .ab-rail__list a {
  display: block;
  font-family: var(--qy-mono);
  font-size: 13px;
  line-height: 1.5;
  padding: 6px 0 6px 12px;
  border-left: 3px solid var(--qy-line);
  color: var(--qy-graphite);
  text-decoration: none;
  transition: border-color var(--qy-ease), color var(--qy-ease);
}
.page-about .ab-rail__list a:hover {
  border-left-color: var(--qy-orange);
  color: var(--qy-ink);
}

.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: clamp(16px, 2.6vw, 28px);
  padding-left: 48px;
  min-width: 0;
}
.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--qy-orange) 0 6px, transparent 6px 14px);
  opacity: 0.6;
}
.page-about .ab-timeline__figure {
  margin: 0;
  width: 100%;
  max-width: 400px;
}

.page-about .ab-node {
  position: relative;
  min-width: 0;
}
.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -48px;
  top: 6px;
  box-sizing: border-box;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--qy-orange);
  border: 3px solid var(--qy-paper);
  box-shadow: 0 0 0 2px rgba(16, 20, 24, 0.14);
}
.page-about .ab-node__mark {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}
.page-about .ab-node__year {
  font-family: var(--qy-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--qy-orange);
}
.page-about .ab-node__idx {
  font-family: var(--qy-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--qy-graphite);
}
.page-about .ab-node__body {
  background: #FFFDF7;
  border: 2px solid var(--qy-ink);
  box-shadow: 6px 6px 0 rgba(7, 26, 46, 0.35);
  padding: clamp(16px, 2.2vw, 26px);
  transition: border-color var(--qy-ease), box-shadow var(--qy-ease);
}
.page-about .ab-node:hover .ab-node__body,
.page-about .ab-node:focus-within .ab-node__body {
  border-color: var(--qy-orange);
  box-shadow: 8px 8px 0 rgba(255, 106, 19, 0.32);
}
.page-about .ab-node:nth-child(even) .ab-node__body {
  background: var(--qy-deep);
  border-color: var(--qy-trench);
  color: var(--qy-paper);
}
.page-about .ab-node__title {
  font-family: var(--qy-head);
  font-size: clamp(19px, 2.3vw, 25px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 0 0 8px;
}
.page-about .ab-node__text {
  font-size: 16.5px;
  line-height: 1.75;
  margin: 0;
}
.page-about .ab-node__note {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--qy-orange);
  font-size: 15px;
  line-height: 1.7;
  color: var(--qy-graphite);
}
.page-about .ab-node:nth-child(even) .ab-node__note {
  color: rgba(245, 241, 232, 0.72);
}
.page-about .ab-node a {
  color: var(--qy-orange);
}

/* ---------- 规模记分牌 ---------- */
.page-about .ab-scale {
  position: relative;
}
.page-about .ab-scale__board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 36px);
}

/* ---------- 版本规则 ---------- */
.page-about .ab-rules {
  color: var(--qy-ink);
}
.page-about .ab-rules__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 48px);
  align-items: start;
}
.page-about .ab-rules__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
}
.page-about .ab-rules__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  font-size: 15.5px;
  line-height: 1.7;
  padding: 10px 0;
  border-bottom: 1px dashed var(--qy-line);
}
.page-about .ab-rules__list .qy-mono {
  color: var(--qy-orange);
  font-weight: 700;
}
.page-about .ab-rules__media {
  margin: 0;
}

/* ---------- 三组人 ---------- */
.page-about .ab-teams {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3.4vw, 36px);
}
.page-about .ab-team {
  background: var(--qy-paper);
  color: var(--qy-ink);
  border: 2px solid var(--qy-ink);
  box-shadow: var(--qy-shadow-sm);
  padding: clamp(16px, 2.2vw, 24px);
  transition: border-color var(--qy-ease), box-shadow var(--qy-ease);
}
.page-about .ab-team:hover {
  border-color: var(--qy-orange);
  box-shadow: 6px 6px 0 rgba(255, 106, 19, 0.32);
}
.page-about .ab-team summary {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  font-family: var(--qy-head);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.page-about .ab-team summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-team__tag {
  margin-left: auto;
  font-family: var(--qy-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--qy-graphite);
}
.page-about .ab-team summary::after {
  content: "+";
  margin-left: 10px;
  font-family: var(--qy-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--qy-orange);
}
.page-about .ab-team[open] summary::after {
  content: "–";
}
.page-about .ab-team__body {
  margin-top: 14px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--qy-graphite);
}
.page-about .ab-team__body .ab-node__text {
  color: var(--qy-graphite);
  font-size: 15.5px;
}
.page-about .ab-team__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .ab-team__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.7;
}
.page-about .ab-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--qy-orange);
}
.page-about .ab-team a {
  color: var(--qy-old);
  font-weight: 700;
}

.page-about .ab-flow {
  list-style: none;
  counter-reset: abflow;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .ab-flow li {
  counter-increment: abflow;
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 15.5px;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.86);
}
.page-about .ab-flow li::before {
  content: counter(abflow, decimal-leading-zero);
  flex: 0 0 auto;
  font-family: var(--qy-mono);
  font-size: 13px;
  color: var(--qy-orange);
}

/* ---------- 协作生态 ---------- */
.page-about .ab-coop {
  color: var(--qy-ink);
}
.page-about .ab-coop__grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(22px, 3.4vw, 36px);
}
.page-about .ab-coop__item {
  border-top: 4px solid var(--qy-ink);
  padding-top: 14px;
  min-width: 0;
}
.page-about .ab-coop__num {
  display: block;
  font-family: var(--qy-mono);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--qy-orange);
}
.page-about .ab-coop__label {
  display: block;
  font-family: var(--qy-head);
  font-size: 18px;
  font-weight: 800;
  margin: 8px 0 6px;
}
.page-about .ab-coop__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--qy-graphite);
}
.page-about .ab-coop__text a {
  color: var(--qy-old);
  font-weight: 700;
}

/* ---------- 旧海报式强调块 ---------- */
.page-about .ab-poster {
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  background: var(--qy-paper);
  color: var(--qy-ink);
  border: 3px solid var(--qy-ink);
  box-shadow: 8px 8px 0 rgba(255, 106, 19, 0.28);
  padding: clamp(20px, 3vw, 32px);
}
.page-about .ab-poster p {
  margin: 0;
  font-family: var(--qy-head);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

/* ---------- 入口路线 ---------- */
.page-about .ab-routes {
  margin-top: clamp(22px, 3.4vw, 36px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-scale__board {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-coop__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
    gap: clamp(32px, 4vw, 56px);
  }
  .page-about .ab-rules__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-scale__board {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .page-about .ab-timeline {
    padding-left: 34px;
  }
  .page-about .ab-timeline::before {
    left: 6px;
  }
  .page-about .ab-node::before {
    left: -34px;
    width: 18px;
    height: 18px;
  }
  .page-about .ab-node__mark {
    flex-wrap: wrap;
    gap: 6px;
  }
  .page-about .ab-team__tag {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}