.page-about {
  --about-rail-w: 168px;
  --about-gap: clamp(28px, 4vw, 64px);
  --about-paper-shadow: 7px 7px 0 var(--dj-ink);
  position: relative;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(16px, 2.4vw, 28px);
  padding-bottom: clamp(4px, 1vw, 10px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-about .about-hero__strip {
  margin-bottom: clamp(28px, 4.5vw, 64px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--dj-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--dj-ice);
}

.page-about .about-hero__title {
  margin: 0.6rem 0 0;
  font-family: var(--dj-font-serif);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.2vw, 4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--dj-white);
  max-width: 20em;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 40em;
  font-size: clamp(1rem, 1.25vw, 1.1rem);
  line-height: 1.85;
  color: var(--dj-gray);
}

.page-about .about-hero__side {
  border-left: 3px solid var(--dj-ice);
  padding-left: clamp(14px, 1.6vw, 20px);
}

.page-about .about-hero__side p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--dj-gray);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(36px, 5vw, 64px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--dj-line-strong);
  border-top: 1px solid var(--dj-line-strong);
  border-bottom: 1px solid var(--dj-line-strong);
}

.page-about .about-figure {
  background: var(--dj-night);
  padding: clamp(16px, 2vw, 24px) clamp(12px, 1.6vw, 20px);
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--dj-font-mono);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--dj-ice);
}

.page-about .about-figure:nth-child(3) .about-figure__num {
  color: var(--dj-red);
}

.page-about .about-figure__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--dj-gray);
}

/* ---------- 通用小节标题 ---------- */
.page-about .about-sechead {
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .about-sechead .dj-section__num {
  display: inline-block;
  font-family: var(--dj-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--dj-red);
}

.page-about .about-sechead .dj-section__title {
  margin: 8px 0 0;
  font-family: var(--dj-font-serif);
  font-weight: 900;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--dj-white);
}

.page-about .about-sechead .dj-section__note {
  margin: 10px 0 0;
  max-width: 38em;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--dj-gray);
}

/* ---------- 为什么按赛季做档案 ---------- */
.page-about .about-why__grid {
  align-items: start;
}

.page-about .about-side__num {
  display: block;
  font-family: var(--dj-font-mono);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1;
  color: var(--dj-ice);
  opacity: 0.55;
}

.page-about .about-side__title {
  margin: 12px 0 0;
  font-family: var(--dj-font-serif);
  font-weight: 900;
  font-size: clamp(1.3rem, 2.2vw, 1.75rem);
  line-height: 1.3;
  color: var(--dj-white);
}

.page-about .about-why__body p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--dj-gray);
}

.page-about .about-why__body p + p {
  margin-top: 1.1em;
}

/* ---------- 编年主轴 ---------- */
.page-about .about-chronicle__banner {
  margin: 0 0 clamp(32px, 4.4vw, 60px);
  aspect-ratio: 1400 / 900;
  border: 1px solid var(--dj-line-strong);
  box-shadow: var(--about-paper-shadow);
  overflow: hidden;
}

.page-about .about-chronicle__banner .dj-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-axis {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-axis__rail {
  position: relative;
  min-width: 0;
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--dj-line);
  border-left: 2px solid var(--dj-line-strong);
  text-decoration: none;
  color: var(--dj-gray);
  white-space: nowrap;
  transition: color 200ms var(--dj-ease), background 200ms var(--dj-ease), border-color 200ms var(--dj-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--dj-white);
  background: rgba(79, 209, 197, 0.08);
  border-left-color: var(--dj-ice);
  outline: none;
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--dj-ice);
  outline-offset: 2px;
}

.page-about .about-rail .dj-rail__num {
  font-family: var(--dj-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--dj-ice);
}

.page-about .about-rail__label {
  font-size: 0.84rem;
}

.page-about .about-axis__stream {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 2.8vw, 38px);
}

.page-about .about-era {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px) clamp(18px, 2.4vw, 30px) clamp(20px, 2.6vw, 30px) clamp(26px, 3.4vw, 44px);
  background: var(--dj-night-3);
  border: 1px solid var(--dj-line-strong);
  box-shadow: var(--about-paper-shadow);
  transition: transform 260ms var(--dj-ease), box-shadow 260ms var(--dj-ease);
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--about-era-color, var(--dj-ice));
}

.page-about .about-era:hover {
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 var(--dj-ink);
}

.page-about .about-axis__stream .about-era:nth-child(1) { --about-era-color: var(--dj-ice); }
.page-about .about-axis__stream .about-era:nth-child(2) { --about-era-color: var(--dj-blue); }
.page-about .about-axis__stream .about-era:nth-child(3) { --about-era-color: var(--dj-yellow); }
.page-about .about-axis__stream .about-era:nth-child(4) { --about-era-color: var(--dj-red); }
.page-about .about-axis__stream .about-era:nth-child(5) { --about-era-color: var(--dj-green); }
.page-about .about-axis__stream .about-era:nth-child(6) { --about-era-color: var(--dj-white); }

.page-about .about-era__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .about-era__span {
  margin: 0;
  font-family: var(--dj-font-serif);
  font-weight: 800;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  letter-spacing: -0.01em;
  color: var(--dj-white);
}

.page-about .about-era__span::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  background: var(--about-era-color, var(--dj-ice));
  vertical-align: middle;
}

.page-about .about-era__count {
  margin-left: auto;
  font-family: var(--dj-font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--dj-gray);
}

.page-about .about-era__lede {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--dj-gray);
}

.page-about .about-era__fold {
  margin-top: 18px;
  border-top: 1px dashed var(--dj-line-strong);
  padding-top: 12px;
}

.page-about .about-era__fold .dj-fold__summary {
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  color: var(--dj-ice);
  cursor: pointer;
}

.page-about .about-era__fold .dj-fold__body p {
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--dj-gray);
}

/* ---------- 档案团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 52px);
  align-items: start;
}

.page-about .about-team__prose p {
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--dj-gray);
}

.page-about .about-team__prose p + p {
  margin-top: 1.05em;
}

.page-about .about-team__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--dj-line-strong);
  box-shadow: var(--about-paper-shadow);
  overflow: hidden;
}

.page-about .about-team__media .dj-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-team__media .dj-media__cap {
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--dj-gray);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(32px, 4vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-role {
  background: var(--dj-night-2);
  border-top: 3px solid var(--dj-ice);
  padding: clamp(18px, 2.2vw, 26px);
}

.page-about .about-role:nth-child(2) { border-top-color: var(--dj-blue); }
.page-about .about-role:nth-child(3) { border-top-color: var(--dj-green); }

.page-about .about-role__num {
  display: block;
  font-family: var(--dj-font-mono);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1;
  color: var(--dj-white);
}

.page-about .about-role__name {
  margin: 10px 0 0;
  font-family: var(--dj-font-serif);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--dj-white);
}

.page-about .about-role__desc {
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--dj-gray);
}

/* ---------- 高原研究方向 ---------- */
.page-about .about-plateau__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 52px);
  align-items: center;
}

.page-about .about-plateau__media {
  margin: 0;
  aspect-ratio: 12 / 7;
  border: 1px solid var(--dj-line-strong);
  box-shadow: var(--about-paper-shadow);
  overflow: hidden;
}

.page-about .about-plateau__media .dj-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-plateau__media .dj-media__cap {
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--dj-gray);
}

.page-about .about-plateau__copy .dj-prose p {
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--dj-gray);
}

.page-about .about-plateau__copy .dj-prose p + p {
  margin-top: 1.05em;
}

.page-about .about-plateau__facts {
  list-style: none;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--dj-line);
  padding-top: clamp(16px, 2vw, 24px);
}

.page-about .about-plateau__facts li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--dj-gray);
}

.page-about .about-plateau__facts strong {
  font-family: var(--dj-font-mono);
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--dj-ice);
  min-width: 8.5rem;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
}

.page-about .about-watermark {
  position: absolute;
  right: -0.04em;
  top: -0.1em;
  font-family: var(--dj-font-serif);
  font-weight: 900;
  font-size: clamp(5.5rem, 16vw, 14rem);
  line-height: 1;
  color: var(--dj-white);
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
}

.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--dj-line);
  border: 1px solid var(--dj-line-strong);
}

.page-about .about-node {
  background: var(--dj-night-2);
  padding: clamp(18px, 2.2vw, 26px);
  transition: background 240ms var(--dj-ease);
}

.page-about .about-node:hover {
  background: var(--dj-night-3);
}

.page-about .about-node__year {
  display: block;
  font-family: var(--dj-font-mono);
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--dj-ice);
}

.page-about .about-node__name {
  margin: 10px 0 0;
  font-family: var(--dj-font-serif);
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--dj-white);
}

.page-about .about-node__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--dj-gray);
  transition: max-height 280ms var(--dj-ease), opacity 280ms var(--dj-ease), margin-top 280ms var(--dj-ease);
}

.page-about .about-node:hover .about-node__more,
.page-about .about-node:focus-within .about-node__more {
  max-height: 12rem;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 合作与产出 ---------- */
.page-about .about-network__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 48px);
}

.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--dj-line-strong);
  border: 1px solid var(--dj-line-strong);
}

.page-about .about-partners li {
  background: var(--dj-night-3);
  padding: clamp(14px, 1.8vw, 20px);
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-partners strong {
  font-family: var(--dj-font-mono);
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 500;
  line-height: 1;
  color: var(--dj-red);
  min-width: 3.2rem;
}

.page-about .about-partners span {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--dj-gray);
}

.page-about .about-yields {
  margin: 0;
  padding: 0 0 0 1.15em;
  display: grid;
  gap: 12px;
}

.page-about .about-yields li {
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--dj-gray);
}

.page-about .about-network__text {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--dj-gray);
}

.page-about .about-cta {
  margin-top: clamp(34px, 4.5vw, 60px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--dj-line);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 8.5fr) minmax(0, 3.5fr);
    gap: clamp(40px, 5vw, 88px);
    align-items: end;
  }

  .page-about .about-axis {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-axis__rail {
    position: sticky;
    top: calc(var(--dj-header-h) + 28px);
  }

  .page-about .about-rail {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    white-space: normal;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-plateau__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(36px, 4.5vw, 72px);
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(36px, 5vw, 80px);
    align-items: start;
  }
}

@media (min-width: 760px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-nodes {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (hover: none) {
  .page-about .about-node__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

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

  .page-about .about-era:hover {
    transform: none;
    box-shadow: var(--about-paper-shadow);
  }
}
<<<END>>>