.page-about {
  --about-rail-w: 216px;
  --about-gap: clamp(20px, 3vw, 40px);
  display: block;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .about-top {
  padding-top: clamp(12px, 2vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 38px);
}

.page-about .about-hero__copy {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-hero__copy .lede {
  max-width: 60ch;
}

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

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-hero__media img {
  width: 100%;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

/* ---------- 索引带 ---------- */
.page-about .about-band {
  margin-top: clamp(32px, 5vw, 68px);
  padding-block: 14px;
  border-block: 1px solid var(--line);
  background: rgba(11, 31, 24, 0.55);
}

.page-about .about-band .index-band__track {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 2px;
}

.page-about .about-band .index-band__track::-webkit-scrollbar {
  display: none;
}

.page-about .about-band .index-band__track:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
  border-radius: var(--radius-pill);
}

.page-about .about-band .band-chip {
  white-space: nowrap;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- 主体分栏 ---------- */
.page-about .about-shell {
  margin-top: clamp(36px, 6vw, 78px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-rail {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
}

.page-about .about-stat__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(11, 31, 24, 0.62);
  text-decoration: none;
  color: inherit;
  min-height: 44px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-stat__link:hover,
.page-about .about-stat__link:focus-visible {
  border-color: var(--lime);
  background: var(--ink-2);
  transform: translateX(2px);
  outline: none;
}

.page-about .about-stat .stat__value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--lime);
  line-height: 1.2;
}

.page-about .about-stat .stat__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 叙事流 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(52px, 7vw, 100px);
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: 96px;
  min-width: 0;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: 0.52em;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--lime);
  margin-right: 0.7em;
}

.page-about .about-sec > p {
  max-width: 68ch;
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.75;
}

.page-about .about-sec > h2 {
  max-width: 30ch;
}

.page-about .about-note {
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 分叉路径图 ---------- */
.page-about .about-fork {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(11, 31, 24, 0.55);
}

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

.page-about .about-fork figcaption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- 版本轨道 ---------- */
.page-about .ver-wrap {
  position: relative;
  margin-top: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ver-wrap__bg {
  position: absolute;
  inset: 0;
}

.page-about .ver-wrap__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}

.page-about .ver-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(5, 17, 13, 0.95) 0%, rgba(5, 17, 13, 0.74) 55%, rgba(18, 48, 38, 0.88) 100%);
}

.page-about .ver-wrap__inner {
  position: relative;
  z-index: 1;
  padding: clamp(20px, 3.4vw, 40px);
}

.page-about .ver-track {
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 4px 4px 16px;
  scrollbar-width: thin;
}

.page-about .ver-track:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 6px;
  border-radius: var(--radius-md);
}

.page-about .ver-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 16px;
  width: max-content;
}

.page-about .ver-node {
  width: min(76vw, 268px);
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(5, 17, 13, 0.76);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ver-node:hover,
.page-about .ver-node:focus-within,
.page-about .ver-node:focus-visible {
  border-color: var(--orange);
  background: rgba(18, 48, 38, 0.92);
  outline: none;
}

.page-about .ver-node__top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .ver-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 155, 69, 0.16);
  flex: 0 0 auto;
}

.page-about .ver-node__ver {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .ver-node__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
}

.page-about .ver-node__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.page-about .ver-node:hover .ver-node__note,
.page-about .ver-node:focus-within .ver-node__note {
  -webkit-line-clamp: 20;
}

/* ---------- 场馆共建 ---------- */
.page-about .build-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(18px, 3vw, 28px);
  align-items: center;
}

.page-about .build-grid__text p {
  max-width: 62ch;
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.75;
}

.page-about .build-grid__text p:last-child {
  margin-bottom: 0;
  color: var(--white);
}

.page-about .build-grid__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .build-grid__media img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(18px, 3vw, 26px) 0 clamp(20px, 3vw, 28px);
}

.page-about .team-card {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-card__role {
  margin: 10px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 收尾行动带 ---------- */
.page-about .about-cta {
  margin-top: clamp(22px, 3.4vw, 34px);
  padding: clamp(24px, 4vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(18, 48, 38, 0.92), rgba(5, 17, 13, 0.94));
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 32px);
  align-items: center;
}

.page-about .about-cta__copy .h-sub {
  margin: 10px 0 8px;
}

.page-about .about-cta__copy p:last-child {
  margin: 0;
  max-width: 56ch;
  color: var(--muted);
  line-height: 1.75;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .build-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .team-grid {
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 20px);
    max-height: calc(100vh - var(--topbar-h) - 40px);
    overflow-y: auto;
    scrollbar-width: thin;
  }

  .page-about .about-stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-stat__link:hover,
  .page-about .about-stat__link:focus-visible {
    transform: translateX(4px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat__link,
  .page-about .ver-node {
    transition: none;
  }
}