.page-about {
  --about-rail: clamp(170px, 21vw, 250px);
  --about-panel: rgba(14, 42, 32, 0.62);
  --about-panel-hi: rgba(18, 58, 44, 0.88);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 26px;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--cyan-soft);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .breadcrumbs .crumb-sep {
  color: rgba(143, 247, 221, 0.4);
}

/* ---------- 通用排版件 ---------- */
.page-about .about-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.6vw, 2.7rem);
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-about .about-lede {
  max-width: 58ch;
  margin: 0;
  color: var(--mist);
  font-size: 0.98rem;
  line-height: 1.85;
}

.page-about .section {
  padding-block: clamp(44px, 7vw, 92px);
}

.page-about .section--tight {
  padding-block: clamp(32px, 5vw, 60px);
}

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  padding-bottom: clamp(36px, 6vw, 76px);
}

.page-about .about-lead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 50px);
  padding-top: clamp(18px, 3vw, 34px);
}

.page-about .about-lead h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 7.4vw, 4.1rem);
  line-height: 0.96;
  letter-spacing: -0.018em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-about .about-lead h1 em {
  font-style: normal;
  color: var(--cyan);
  background: linear-gradient(180deg, transparent 64%, rgba(53, 242, 192, 0.2) 64%);
  padding: 0 0.05em;
}

.page-about .about-lead .lede {
  max-width: 46ch;
  margin: 0;
  color: var(--chalk);
  font-size: clamp(1rem, 1.7vw, 1.14rem);
  line-height: 1.78;
}

.page-about .about-lead-main > p:not(.lede):not(.about-kicker) {
  max-width: 54ch;
  margin: 18px 0 0;
  color: var(--mist);
  font-size: 0.96rem;
  line-height: 1.85;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 2px 18px;
  border-radius: var(--radius);
  border-top: 1px solid var(--line-strong);
  background: linear-gradient(160deg, rgba(18, 58, 44, 0.88), rgba(7, 26, 20, 0.42));
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-facts li:last-child {
  border-bottom: 0;
}

.page-about .about-fact-k {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-fact-v {
  color: var(--chalk);
  font-size: 1rem;
  text-align: right;
  white-space: nowrap;
}

.page-about .about-fact-v.is-accent {
  color: var(--orange);
}

/* ---------- 媒体 ---------- */
.page-about .media {
  margin: 0;
}

.page-about .media-frame {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--ink-2);
}

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

.page-about .about-origin-media img {
  aspect-ratio: 16 / 10;
}

.page-about .about-rail-media img {
  aspect-ratio: 1 / 1;
}

.page-about .about-team-media img {
  aspect-ratio: 21 / 9;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 起点 ---------- */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 54px);
}

.page-about .about-origin-copy > p:not(.about-kicker) {
  max-width: 56ch;
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 0.96rem;
  line-height: 1.85;
}

.page-about .about-points {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-points li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-faint);
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.72;
}

.page-about .about-points .mono {
  color: var(--cyan);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

/* ---------- 版本档案 ---------- */
.page-about .about-archive-head {
  max-width: 64ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-archive-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 42px);
}

.page-about .about-rail {
  display: grid;
  gap: 16px;
}

.page-about .about-rail-list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail-list a {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .about-timeline {
  display: grid;
  gap: 14px;
}

.page-about .about-version {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(18, 58, 44, 0.92), rgba(9, 30, 23, 0.74));
  transition: border-color 0.3s var(--ease);
}

.page-about .about-version:hover {
  border-color: var(--line-strong);
}

.page-about .about-version[open] {
  border-color: rgba(53, 242, 192, 0.4);
}

.page-about .about-version.is-current {
  border-color: rgba(255, 154, 61, 0.48);
}

.page-about .about-version > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
}

.page-about .about-version > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-version > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-version[open] > summary::after {
  content: "–";
}

.page-about .about-version .ver-no {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-version.is-current .ver-no {
  color: var(--orange);
}

.page-about .about-version .ver-title {
  flex: 1 1 12ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.35;
  color: var(--chalk);
}

.page-about .about-version .ver-body {
  padding: 0 18px 20px;
  margin-top: 2px;
  border-top: 1px solid var(--line-faint);
}

.page-about .about-version .ver-body p {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.85;
}

.page-about .about-version .ver-points {
  list-style: none;
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-version .ver-points li {
  position: relative;
  padding-left: 18px;
  color: var(--cyan-soft);
  font-size: 0.88rem;
  line-height: 1.7;
}

.page-about .about-version .ver-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team-head {
  max-width: 66ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-team-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-board {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: radial-gradient(circle at 50% 44%, rgba(53, 242, 192, 0.08), transparent 64%);
}

.page-about .about-crew {
  list-style: none;
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about .about-crew-item {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid rgba(53, 242, 192, 0.34);
  border-radius: var(--radius);
  background: var(--about-panel);
  transition: border-color 0.28s var(--ease), background-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .about-crew-item:hover,
.page-about .about-crew-item:focus-within {
  border-color: var(--line-strong);
  border-left-color: var(--cyan);
  background: var(--about-panel-hi);
  transform: translateX(3px);
}

.page-about .about-crew-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--chalk);
}

.page-about .about-crew-item p {
  margin: 8px 0 0;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .about-crew-tag {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  opacity: 0.6;
  transition: opacity 0.28s var(--ease);
}

.page-about .about-crew-item:hover .about-crew-tag,
.page-about .about-crew-item:focus-within .about-crew-tag {
  opacity: 1;
}

.page-about .about-team-media {
  margin-top: clamp(28px, 5vw, 56px);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-ops-head {
  max-width: 60ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-ops-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-ops-card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-top: 2px solid rgba(53, 242, 192, 0.4);
  background: linear-gradient(165deg, rgba(18, 58, 44, 0.86), rgba(7, 26, 20, 0.52));
}

.page-about .about-ops-time {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-ops-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  color: var(--chalk);
}

.page-about .about-ops-card p {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.78;
}

/* ---------- 合作与成果 ---------- */
.page-about .about-partners-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-partners-copy > p:not(.about-kicker) {
  max-width: 54ch;
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 0.96rem;
  line-height: 1.85;
}

.page-about .about-partners-copy .btn {
  margin-top: 10px;
}

.page-about .about-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line-faint);
  overflow: hidden;
}

.page-about .about-stats li {
  padding: 18px 16px;
  background: rgba(10, 32, 24, 0.94);
}

.page-about .about-stats .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-stats .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.76rem;
  line-height: 1.62;
  color: var(--mist);
}

/* ---------- 接着往下走 ---------- */
.page-about .about-next-title {
  margin-bottom: 20px;
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 42, 32, 0.62);
  color: var(--chalk);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  text-decoration: none;
  transition: border-color 0.26s var(--ease), background-color 0.26s var(--ease);
}

.page-about .about-next-link::after {
  content: "→";
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--cyan);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(18, 58, 44, 0.9);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-ops-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-lead-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-lead-aside {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 960px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
  }

  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-archive-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail-list a {
    margin-left: -1px;
    padding: 9px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
  }

  .page-about .about-rail-list a:hover,
  .page-about .about-rail-list a:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(53, 242, 192, 0.06);
  }

  .page-about .about-timeline {
    position: relative;
    padding-left: 36px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 9px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(180deg, rgba(53, 242, 192, 0.7), rgba(53, 242, 192, 0.06));
  }

  .page-about .about-version::before {
    content: "";
    position: absolute;
    left: -32px;
    top: 24px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink);
    border: 2px solid var(--cyan);
    box-shadow: 0 0 0 4px rgba(53, 242, 192, 0.12);
  }

  .page-about .about-version.is-current::before {
    border-color: var(--orange);
    box-shadow: 0 0 0 4px rgba(255, 154, 61, 0.16);
  }

  .page-about .about-team-body {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-board-wrap {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-ops-card {
    padding: 24px 22px;
  }

  .page-about .about-crew {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-crew-item,
  .page-about .about-crew-tag,
  .page-about .about-rail-list a,
  .page-about .about-next-link {
    transition: none;
  }

  .page-about .about-crew-item:hover,
  .page-about .about-crew-item:focus-within {
    transform: none;
  }
}