.page-about {
  --about-narrow: 720px;
  --about-rail: 208px;
  --about-node: clamp(232px, 25vw, 292px);
  position: relative;
  color: var(--paper);
  font-family: var(--font-body);
  background: linear-gradient(
    172deg,
    var(--ink-900) 0%,
    var(--ink-900) 48%,
    var(--ink-800) 100%
  );
  overflow-x: hidden;
}

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

.page-about .figure-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(22px, 5vw, 52px) 0 clamp(32px, 6vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
  align-items: end;
  margin-top: clamp(16px, 2.5vw, 28px);
}

.page-about .about-hero__text h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(31px, 5.4vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 clamp(16px, 2vw, 22px);
  max-width: 640px;
}

.page-about .about-lede {
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
  max-width: 620px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure .figure-frame {
  aspect-ratio: 3 / 2;
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-hero__figure .figure-caption {
  margin-top: 10px;
}

/* ---------- 数字条 ---------- */

.page-about .about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--rule);
  border-radius: var(--radius-soft);
  overflow: hidden;
}

.page-about .about-stats li {
  background: var(--ink-900);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.4vw, 26px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-stats li span:last-child {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 48px);
  padding-top: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .about-rail {
  border-bottom: var(--rule);
  padding-bottom: 4px;
}

.page-about .about-rail__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}

.page-about .about-rail ol {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  scrollbar-width: none;
}

.page-about .about-rail ol::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail li {
  flex: 0 0 auto;
}

.page-about .rail-link {
  display: block;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

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

.page-about .rail-link.is-active {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 叙事章节 ---------- */

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

.page-about .about-chapter {
  max-width: var(--about-narrow);
  padding: clamp(28px, 5vw, 46px) 0;
  border-top: var(--rule);
  scroll-margin-top: 110px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__tag {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-chapter__tag::before {
  content: "";
  width: 24px;
  height: 2px;
  flex: 0 0 auto;
  background: var(--cyan);
}

.page-about .about-chapter h2,
.page-about .about-history h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 16px;
}

.page-about .about-chapter p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--paper);
  margin: 0 0 16px;
  max-width: 38em;
}

.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 420px;
}

.page-about .about-chapter__figure .figure-frame {
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-chapter__figure .figure-caption {
  margin-top: 10px;
}

/* ---------- 团队分工网格 ---------- */

.page-about .about-roster {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: var(--rule);
  border-radius: var(--radius-soft);
  overflow: hidden;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-role {
  background: var(--ink-900);
}

.page-about .about-role summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-role[open] summary {
  border-bottom: 1px dashed var(--line);
}

.page-about .about-role__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  flex: 0 0 auto;
}

.page-about .about-role__name {
  flex: 1 1 auto;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-role__count {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-role p {
  margin: 0;
  padding: 14px 18px 16px;
  font-size: 15px;
  line-height: 1.74;
  color: var(--muted);
}

/* ---------- 演进时间轴 ---------- */

.page-about .about-history {
  padding: clamp(36px, 7vw, 80px) 0 clamp(40px, 7vw, 84px);
  background: var(--ink-800);
  border-top: var(--rule);
  border-bottom: var(--rule);
  scroll-margin-top: 90px;
}

.page-about .about-history .about-chapter__tag {
  margin-bottom: 14px;
}

.page-about .about-history__lede {
  font-size: 17px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 560px;
}

.page-about .about-history__figure {
  margin: 0 0 clamp(30px, 5vw, 52px);
}

.page-about .about-history__figure .figure-frame {
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-history__figure .figure-caption {
  margin-top: 10px;
}

.page-about .about-timeline {
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  padding-bottom: 10px;
}

.page-about .about-timeline__track {
  display: flex;
  align-items: stretch;
  gap: clamp(16px, 2vw, 28px);
  width: max-content;
  list-style: none;
  margin: 0;
  padding: 0 max(var(--gutter), calc((100vw - var(--shell)) / 2 + var(--gutter)));
}

.page-about .about-timeline__node {
  position: relative;
  flex: 0 0 var(--about-node);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px 20px;
  background: var(--panel);
  border: var(--rule);
  border-radius: var(--radius-card);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-timeline__node:hover {
  border-color: var(--cyan-line);
  transform: translateY(-3px);
}

.page-about .about-timeline__node:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 35px;
  left: 100%;
  width: clamp(16px, 2vw, 28px);
  height: 2px;
  background: var(--cyan-line);
}

.page-about .about-timeline__year {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: clamp(23px, 2.6vw, 28px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-timeline__year::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--cyan-line);
}

.page-about .about-timeline__node h3 {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper);
  margin: 0;
}

.page-about .about-timeline__node p {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  margin: 0;
}

.page-about .about-timeline__note {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.page-about .about-timeline__node:hover .about-timeline__note,
.page-about .about-timeline__node:focus-within .about-timeline__note {
  color: var(--orange);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: clamp(40px, 7vw, 88px) 0 clamp(48px, 8vw, 100px);
}

.page-about .about-cta__box {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(24px, 3.6vw, 42px);
  border: var(--rule);
  border-top: 2px solid var(--cyan);
  border-radius: var(--radius-card);
  background: linear-gradient(135deg, var(--ink-800) 0%, var(--ink-900) 100%);
}

.page-about .about-cta__text h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 12px;
}

.page-about .about-cta__text p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
  max-width: 46em;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-roster {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-rail ol {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .rail-link {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0 3px 3px 0;
    padding: 8px 12px;
    font-size: 12px;
    white-space: normal;
    transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
  }

  .page-about .rail-link.is-active {
    color: var(--cyan);
    background: var(--cyan-soft);
    border-left-color: var(--cyan);
    border-color: var(--cyan);
    border-width: 0 0 0 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__node,
  .page-about .rail-link,
  .page-about .about-timeline__note {
    transition: none;
  }

  .page-about .about-timeline__node:hover {
    transform: none;
  }
}
<<<END>>>