.page-about {
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

.page-about .crumbs__link {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.16s ease;
}
.page-about .crumbs__link:hover {
  color: var(--lime);
}
.page-about .crumbs__current {
  color: var(--text);
}

.page-about .about-band {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(36px, 6vw, 74px);
  border-bottom: 1px solid var(--edge);
  background:
    radial-gradient(760px 380px at 92% -14%, rgba(198, 242, 78, 0.14), transparent 64%),
    linear-gradient(180deg, #0B1220 0%, var(--ink) 78%);
  overflow: hidden;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 6.8vw, 4.3rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin: 16px 0 0;
  max-width: 15em;
}

.page-about .about-hero__rule {
  display: block;
  width: clamp(52px, 8vw, 108px);
  height: 6px;
  margin-top: 22px;
  background: var(--lime);
}

.page-about .about-hero__lede {
  margin: clamp(22px, 3vw, 30px) 0 0;
  max-width: 62ch;
  color: var(--text);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
}
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .about-stats__item {
  background: var(--navy);
  padding: 18px 16px 16px;
}
.page-about .about-stats__n {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3.2vw, 2.1rem);
  line-height: 1;
  color: var(--lime);
  letter-spacing: 0.01em;
}
.page-about .about-stats__l {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  letter-spacing: 0.03em;
}

/* ---------- 左窄右宽通用栅格 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 920px) {
  .page-about .about-split {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }
}

.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--edge);
}
@media (min-width: 920px) {
  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    align-self: start;
    position: sticky;
    top: 28px;
    padding: 2px 18px 2px 0;
    border-bottom: 0;
    border-right: 1px solid var(--edge);
  }
}

.page-about .about-rot {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
@media (min-width: 920px) {
  .page-about .about-rot {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.34em;
  }
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}
@media (min-width: 920px) {
  .page-about .about-toc {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 10px;
    margin-top: 22px;
  }
}
.page-about .about-toc__link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.page-about .about-toc__link:hover,
.page-about .about-toc__link[aria-current="true"] {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-p {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
  max-width: 64ch;
  margin: 0 0 18px;
}
.page-about .about-p:last-child {
  margin-bottom: 0;
}
.page-about .about-p strong {
  color: var(--lime);
  font-weight: 600;
}

/* ---------- 时间轴 ---------- */
.page-about .about-night__media {
  margin: 0 0 clamp(28px, 5vw, 52px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 18px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--edge) 52%, rgba(46, 61, 85, 0.18) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 12px;
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__node {
  position: relative;
  border: 1px solid transparent;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}
.page-about .timeline__node[open] {
  border-color: var(--edge);
  background: rgba(30, 42, 61, 0.42);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 18px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  border: 2px solid var(--edge);
  background: var(--ink);
  transition: border-color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}
.page-about .timeline__node[open]::before {
  border-color: var(--amber);
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.16);
}

.page-about .timeline__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 13px 16px;
  min-height: 44px;
}
.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline__summary::marker {
  content: "";
}
.page-about .timeline__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--muted);
  margin-left: auto;
  transition: color 0.16s ease;
}
.page-about .timeline__node[open] .timeline__summary::after {
  content: "\2212";
  color: var(--lime);
}

.page-about .timeline__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--amber);
}
.page-about .timeline__title {
  flex: 1 1 200px;
  font-size: 1.0625rem;
  font-weight: 600;
  color: #ffffff;
}

.page-about .timeline__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--edge);
}
.page-about .timeline__body p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team__media {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
}
@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .team-card {
  background: var(--navy);
  padding: 24px 20px;
}
.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 2.6rem);
  line-height: 1;
  color: var(--lime);
}
.page-about .team-card__title {
  margin: 10px 0 16px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: #ffffff;
}
.page-about .team-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .team-card__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .team-card__list li:last-child {
  margin-bottom: 0;
}
.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 7px;
  height: 1px;
  background: var(--lime-deep);
}

/* ---------- 纸色长文区 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--text-on-paper);
  padding: clamp(44px, 7vw, 88px) 0;
  border-bottom: 1px solid var(--paper-2);
}
.page-about .about-paper .section__eyebrow {
  color: var(--lime-deep);
}
.page-about .about-paper .section__title {
  color: var(--text-on-paper);
}
.page-about .about-paper .about-p {
  color: #2A3240;
}
.page-about .about-paper__foot {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--paper-2);
  max-width: 68ch;
}

.page-about .paper-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(24px, 4vw, 40px);
}
@media (min-width: 800px) {
  .page-about .paper-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .paper-card {
  background: #FBF8F0;
  border: 1px solid var(--paper-2);
  padding: clamp(22px, 3vw, 32px);
  box-shadow: 6px 6px 0 var(--paper-2);
}
.page-about .paper-card__title {
  margin: 0 0 8px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-on-paper);
}
.page-about .paper-card__meta {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #6B7484;
}
.page-about .paper-card__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}
.page-about .paper-card__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: #38414F;
}
.page-about .paper-card__list li:last-child {
  margin-bottom: 0;
}
.page-about .paper-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--lime-deep);
}
.page-about .paper-card__link {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #2C4A05;
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--lime-deep);
  transition: background-color 0.16s ease, color 0.16s ease;
}
.page-about .paper-card__link:hover {
  color: #1B2E04;
  background: rgba(143, 209, 23, 0.22);
}

/* ---------- 合作生态 ---------- */
.page-about .partners-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}
@media (min-width: 900px) {
  .page-about .partners-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}
.page-about .partners__text {
  min-width: 0;
}
.page-about .partners__media {
  margin: 0;
}

.page-about .partner-stats {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .partner-stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--edge);
  font-size: 0.875rem;
  color: var(--muted);
}
.page-about .partner-stats b {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--lime);
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  background: var(--edge);
  border: 1px solid var(--edge);
}
@media (min-width: 820px) {
  .page-about .next-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .next-card {
  display: block;
  padding: 24px 20px 22px;
  background: var(--navy);
  color: inherit;
  text-decoration: none;
  transition: background-color 0.18s ease;
}
.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--steel);
}
.page-about .next-card__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--amber);
}
.page-about .next-card__title {
  display: block;
  margin-top: 12px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: #ffffff;
}
.page-about .next-card__desc {
  display: block;
  margin-top: 8px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .next-card__arrow {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  color: var(--lime);
  transition: transform 0.18s ease;
}
.page-about .next-card:hover .next-card__arrow {
  transform: translateX(4px);
}

.page-about .about-next__foot {
  margin: 22px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-next__foot a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 242, 78, 0.45);
}
.page-about .about-next__foot a:hover {
  border-bottom-color: var(--lime);
}

/* ---------- 图片兜底 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .paper-card__link,
  .page-about .next-card,
  .page-about .next-card__arrow,
  .page-about .timeline__node,
  .page-about .timeline__node::before {
    transition: none;
  }
}