.page-about {
  --about-edge: 1px solid var(--line);
  --about-gap: 20px;
  --about-read: 68ch;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
}
.page-about .about-crumb .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}
.page-about .about-crumb .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .about-crumb .breadcrumb a:hover,
.page-about .about-crumb .breadcrumb a:focus-visible {
  color: var(--home);
  border-bottom-color: var(--home);
}
.page-about .about-crumb .breadcrumb span[aria-hidden] {
  margin: 0 8px;
  opacity: .5;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 18px;
  padding-bottom: 44px;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}
.page-about .about-hero__copy h1 {
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.06;
  letter-spacing: -.01em;
  margin: 10px 0 18px;
  color: var(--paper);
}
.page-about .about-hero__copy .lead {
  font-size: 16px;
  line-height: 1.78;
  color: var(--body-text);
  max-width: var(--about-read);
}
.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 30px;
}
.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  border-top: var(--about-edge);
  padding-top: 18px;
}
.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
}
.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  font-weight: 600;
  color: var(--home);
  letter-spacing: -.02em;
}

.page-about .about-hero__visual {
  position: relative;
}
.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  inset: -10px -10px -10px auto;
  width: 40%;
  border-right: 1px solid var(--line);
  border-top: 1px solid var(--line);
  pointer-events: none;
}
.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
  max-width: 560px;
  margin-left: auto;
}
.page-about .about-map__k {
  font-family: var(--font-cond);
  font-size: 15px;
  font-weight: 700;
  fill: var(--paper);
  letter-spacing: .02em;
}
.page-about .about-map__v {
  font-family: var(--font-mono);
  font-size: 10.5px;
  fill: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 通用栏目标题组 ---------- */
.page-about .about-head {
  max-width: 65ch;
  margin-bottom: 30px;
}
.page-about .about-head h2 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 8px 0 12px;
}
.page-about .about-head__sub {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ---------- 主客场观测缘起 ---------- */
.page-about .about-why {
  padding-block: 40px;
  background: var(--pitch);
  border-top: var(--about-edge);
  border-bottom: var(--about-edge);
}
.page-about .about-why__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .about-why__lead h2 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 8px 0 0;
}
.page-about .about-why__lead h2::after {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  margin-top: 18px;
  background: var(--home);
}
.page-about .about-why__body p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--body-text);
  margin: 0 0 16px;
}
.page-about .about-why__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 收录历程 ---------- */
.page-about .about-timeline {
  padding-block: 48px;
}
.page-about .about-timeline__banner {
  margin: 0 0 30px;
  border: var(--about-edge);
  background: var(--turf);
}
.page-about .about-timeline__banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.45);
  opacity: .82;
}

.page-about .about-span {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.page-about .about-span__node {
  padding: 20px 0 22px;
  border-top: var(--about-edge);
}
.page-about .about-span__node:first-child {
  border-top-color: var(--home);
  border-top-width: 2px;
}
.page-about .about-span__no {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--data);
  margin-bottom: 8px;
}
.page-about .about-span__node h3 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .01em;
  color: var(--paper);
  margin: 0 0 8px;
}
.page-about .about-span__node p {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  margin: 0;
}

/* ---------- 团队分工 ---------- */
.page-about .about-crew {
  padding-block: 48px;
  background: var(--pitch);
  border-top: var(--about-edge);
  border-bottom: var(--about-edge);
}
.page-about .about-crew__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .about-crew__card {
  background: var(--turf);
  border: var(--about-edge);
  padding: 22px 20px 24px;
}
.page-about .about-crew__no {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 46px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--home);
  margin-bottom: 12px;
}
.page-about .about-crew__card h3 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--paper);
  margin: 0 0 10px;
}
.page-about .about-crew__card p {
  font-size: 14px;
  line-height: 1.74;
  color: var(--body-text);
  margin: 0;
}
.page-about .about-crew__figure {
  margin: 28px 0 0;
  border: var(--about-edge);
  background: var(--ink);
}
.page-about .about-crew__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.4);
}
.page-about .about-crew__figure .media__cap {
  display: block;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--muted);
  border-top: var(--about-edge);
}

/* ---------- 场馆与档案 ---------- */
.page-about .about-archive {
  padding-block: 48px;
}
.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .about-archive__body h2 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 8px 0 16px;
}
.page-about .about-archive__body > p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--body-text);
  max-width: var(--about-read);
  margin: 0 0 16px;
}
.page-about .about-archive__item {
  border-top: var(--about-edge);
  padding: 14px 0;
}
.page-about .about-archive__item:last-of-type {
  border-bottom: var(--about-edge);
}
.page-about .about-archive__item summary {
  cursor: pointer;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--paper);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.page-about .about-archive__item summary::-webkit-details-marker {
  display: none;
}
.page-about .about-archive__item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--home);
  flex: none;
}
.page-about .about-archive__item[open] summary::after {
  content: "–";
}
.page-about .about-archive__item summary:focus-visible {
  outline: 2px solid var(--home);
  outline-offset: 4px;
}
.page-about .about-archive__item .disclosure__body p {
  font-size: 14px;
  line-height: 1.76;
  color: var(--muted);
  margin: 12px 0 4px;
  max-width: var(--about-read);
}
.page-about .about-archive__media {
  margin: 0;
  border: var(--about-edge);
  background: var(--turf);
  align-self: start;
}
.page-about .about-archive__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.35);
  opacity: .9;
}

/* ---------- 协作与规模 ---------- */
.page-about .about-reach {
  padding-block: 48px;
  background: var(--pitch);
  border-top: var(--about-edge);
  border-bottom: var(--about-edge);
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: var(--about-edge);
}
.page-about .about-stat {
  background: var(--ink);
  padding: 22px 18px;
}
.page-about .about-stat--home {
  background: var(--turf);
}
.page-about .about-stat--away {
  background: var(--turf);
  border-left: 3px solid var(--away);
}
.page-about .about-stat__n {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 9vw, 62px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--home);
  margin-bottom: 12px;
}
.page-about .about-stat--away .about-stat__n {
  color: var(--away);
}
.page-about .about-stat p {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--body-text);
  margin: 0;
}
.page-about .about-reach__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
  max-width: var(--about-read);
  padding-left: 14px;
  border-left: 3px solid var(--data);
}

/* ---------- 光谷日常 ---------- */
.page-about .about-place {
  padding-block: 48px;
}
.page-about .about-place__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}
.page-about .about-place__copy h2 {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 8px 0 16px;
}
.page-about .about-place__copy p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--body-text);
  max-width: var(--about-read);
  margin: 0 0 14px;
}
.page-about .about-place__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.page-about .about-place__card {
  background: var(--turf);
  border: var(--about-edge);
  padding: 22px 20px;
}
.page-about .about-place__k {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
  margin: 0 0 4px;
}
.page-about .about-place__v {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  margin: 0 0 16px;
}
.page-about .about-place__v:last-child {
  margin-bottom: 0;
}
.page-about .about-place__v--mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: .01em;
  word-break: break-word;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .about-crew__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 28px;
    padding-bottom: 56px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: 1.05fr .95fr;
    gap: 52px;
  }
  .page-about .about-why__grid {
    grid-template-columns: 5fr 7fr;
    gap: 46px;
  }
  .page-about .about-why__lead h2::after {
    margin-top: 26px;
  }
  .page-about .about-crew__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
  .page-about .about-crew__card:nth-child(2) {
    transform: translateY(16px);
  }
  .page-about .about-crew__figure {
    margin-top: 42px;
  }
  .page-about .about-archive__grid {
    grid-template-columns: 7fr 5fr;
    gap: 46px;
    align-items: start;
  }
  .page-about .about-archive__media {
    position: sticky;
    top: 88px;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-place__grid {
    grid-template-columns: 7fr 5fr;
    gap: 46px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-span {
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
  }
  .page-about .about-span__node {
    padding: 20px 16px 0 0;
    border-top-width: 2px;
  }
  .page-about .about-span__node:first-child {
    border-top-color: var(--home);
  }
  .page-about .about-span__node + .about-span__node {
    padding-left: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__card {
    transform: none !important;
  }
}
</main>