.page-about {
  --stage-accent: var(--cyan);
  --node-accent: var(--cyan);
}

.page-about [id] {
  scroll-margin-top: 96px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 4vw, 48px) clamp(36px, 5vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(60, 74, 117, .3) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(60, 74, 117, .3) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(115% 85% at 82% 8%, #000 0%, transparent 66%);
  mask-image: radial-gradient(115% 85% at 82% 8%, #000 0%, transparent 66%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(22px, 3vw, 38px);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
}

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

.page-about .about-hero .breadcrumbs a:hover {
  color: var(--cyan);
}

.page-about .about-hero .breadcrumbs a[aria-current="page"] {
  color: var(--lemon);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero-lead h1 {
  margin: 12px 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 52px);
  line-height: 1.18;
  letter-spacing: .04em;
  color: var(--text);
  max-width: 18ch;
}

.page-about .about-hero-lead .lede {
  max-width: 56ch;
  color: var(--text-dim);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-facets {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .about-facet {
  margin: 0;
  padding: 16px 14px 18px;
  background: var(--ink-800);
}

.page-about .about-facet dt {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-dim);
}

.page-about .about-facet dd {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.15;
  color: var(--text);
}

.page-about .about-unit {
  margin-left: 6px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-dim);
}

/* ---------- 段落导航条 ---------- */

.page-about .about-toc-wrap {
  border-block: 2px solid var(--line);
  background: var(--ink-800);
}

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

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

.page-about .about-toc li {
  flex: none;
}

.page-about .about-toc .toc-link {
  display: block;
  padding: 8px 14px;
  border: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-toc .toc-link:hover {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .about-toc .toc-link[data-current] {
  color: var(--ink-900);
  background: var(--lemon);
  border-color: var(--lemon);
}

/* ---------- 里程碑时间带 ---------- */

.page-about .about-timeline .section-head {
  margin-bottom: clamp(26px, 3.5vw, 44px);
}

.page-about .about-rail {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding-left: 26px;
  border-left: 2px solid var(--line);
}

.page-about .rail-node {
  position: relative;
  display: block;
  padding: 16px 18px 18px;
  background: var(--ink-800);
  border: 2px solid var(--line);
  color: inherit;
  text-decoration: none;
  transition: border-color .18s ease, transform .18s ease, background-color .18s ease;
}

.page-about .rail-node::before {
  content: "";
  position: absolute;
  top: 22px;
  left: -34px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--node-accent);
}

.page-about .rail-node:hover {
  border-color: var(--node-accent);
  background: var(--ink-700);
  transform: translateX(3px);
}

.page-about .rail-node-num {
  display: block;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--node-accent);
}

.page-about .rail-node-title {
  display: block;
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .rail-node-note {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .rail-node--a { --node-accent: var(--cyan); }
.page-about .rail-node--b { --node-accent: var(--violet); }
.page-about .rail-node--c { --node-accent: var(--orange); }
.page-about .rail-node--d { --node-accent: var(--lemon); }

.page-about .about-timeline-figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--line);
}

.page-about .about-timeline-figure .figure-cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-dim);
}

/* ---------- 阶段剖面 ---------- */

.page-about .about-stage--a { --stage-accent: var(--cyan); }
.page-about .about-stage--b { --stage-accent: var(--violet); }
.page-about .about-stage--c { --stage-accent: var(--orange); }
.page-about .about-stage--d { --stage-accent: var(--lemon); }

.page-about .about-stage .section-head,
.page-about .about-stage .stage-body h2 {
  color: var(--text);
}

.page-about .stage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .stage-marker {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .stage-marker::after {
  content: "";
  flex: 1 1 auto;
  height: 2px;
  background: linear-gradient(to right, var(--stage-accent), transparent);
}

.page-about .stage-num {
  font-family: var(--font-editorial);
  font-size: clamp(30px, 4.6vw, 44px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--stage-accent);
}

.page-about .stage-body h2 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.1vw, 32px);
  line-height: 1.32;
  letter-spacing: .03em;
}

.page-about .stage-body .prose {
  max-width: 62ch;
}

.page-about .stage-body .prose p {
  margin: 0 0 1.1em;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .stage-body .prose p:first-child {
  color: var(--text);
}

.page-about .stage-aside {
  display: grid;
  gap: 20px;
  align-content: start;
}

/* 小提示面板 */

.page-about .about-notes {
  padding: 20px 20px 22px;
  background: var(--ink-700);
  border: 2px solid var(--line);
  border-left: 4px solid var(--stage-accent);
}

.page-about .about-notes-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--stage-accent);
}

.page-about .about-notes ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-notes li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-notes li:last-child {
  margin-bottom: 0;
}

.page-about .about-notes li::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 8px;
  height: 2px;
  background: var(--stage-accent);
}

/* 产品线标签 */

.page-about .about-aside-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-dim);
}

.page-about .about-lines {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .about-aside-link {
  display: inline-block;
}

/* 团队角色 */

.page-about .about-roles {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--line);
}

.page-about .about-roles li {
  position: relative;
  padding: 16px 16px 16px 20px;
  border-bottom: 2px solid var(--line);
  border-left: 4px solid var(--stage-accent);
  background: var(--ink-800);
}

.page-about .about-role-name {
  display: block;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--stage-accent);
}

.page-about .about-role-desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* 配图 */

.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-700);
}

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

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure .figure-cap {
  padding: 12px 14px;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 收束 ---------- */

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-cta-copy h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.34;
  letter-spacing: .03em;
  color: var(--text);
}

.page-about .about-cta-copy p {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: center;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

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

  .page-about .about-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    padding-left: 0;
    padding-top: 30px;
    border-left: 0;
    border-top: 2px solid var(--line);
  }

  .page-about .rail-node::before {
    top: -40px;
    left: 20px;
  }

  .page-about .rail-node:hover {
    transform: translateY(-3px);
  }

  .page-about .stage-grid {
    grid-template-columns: 78px minmax(0, 1fr) minmax(0, 300px);
    gap: 0 40px;
    align-items: start;
  }

  .page-about .stage-marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .page-about .stage-marker::after {
    flex: 0 0 auto;
    width: 2px;
    height: 72px;
    background: linear-gradient(to bottom, var(--stage-accent), transparent);
  }

  .page-about .about-stage--b .stage-aside,
  .page-about .about-stage--d .stage-aside {
    margin-top: 12px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 48px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero-lead h1 {
    max-width: 16ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-node,
  .page-about .about-toc .toc-link {
    transition: none;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>