.page-about {
  background: var(--ink-deep);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) var(--gutter) 44px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, var(--panel) 0%, var(--ink-deep) 54%, var(--panel-deep) 100%);
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -18%;
  right: -32%;
  width: 78%;
  height: 150%;
  background: linear-gradient(200deg, rgba(47, 107, 255, 0.32), rgba(10, 23, 48, 0) 62%);
  clip-path: polygon(46% 0, 100% 0, 100% 100%, 0 100%);
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
}

.page-about .breadcrumb {
  margin-bottom: 28px;
  font-size: 12px;
  color: var(--mist);
}

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

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb a {
  color: var(--blue-light);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--white);
  text-decoration: underline;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .eyebrow-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 31, 0.18);
}

.page-about h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 8.4vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.04em;
  color: var(--white);
}

.page-about h1::after {
  content: "";
  display: block;
  width: 74px;
  height: 4px;
  margin-top: 22px;
  background: linear-gradient(90deg, var(--orange), var(--red) 55%, var(--yellow));
  border-radius: 2px;
}

.page-about .lead {
  max-width: var(--measure);
  margin: 0 0 34px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .hero-stat {
  background: rgba(17, 42, 77, 0.72);
  padding: 16px 18px;
}

.page-about .hero-stat dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  margin-bottom: 8px;
}

.page-about .hero-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--orange);
}

.page-about .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: inherit;
}

.page-about .unit {
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px var(--gutter) 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-rail {
  display: none;
  border-left: 1px solid var(--line);
  padding-left: 20px;
}

.page-about .rail-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--yellow);
}

.page-about .toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color 200ms ease, border-color 200ms ease;
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--white);
}

.page-about .toc-link.is-current {
  color: var(--white);
  border-left-color: var(--orange);
}

.page-about .rail-no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--blue-light);
}

.page-about .toc-link.is-current .rail-no {
  color: var(--orange);
}

.page-about .rail-foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-body {
  display: grid;
  gap: 60px;
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .sec-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: 22px;
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 5.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.035em;
  color: var(--white);
}

.page-about .about-note {
  flex: 0 0 auto;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--yellow);
  padding-top: 4px;
}

.page-about .prose {
  max-width: var(--measure);
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .prose + .prose {
  margin-top: -8px;
}

.page-about .sec-cta {
  margin: 26px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--blue);
  background: rgba(17, 42, 77, 0.55);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .sec-cta a,
.page-about p a,
.page-about .partner-contact a:not(.btn) {
  color: var(--blue-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .sec-cta a:hover,
.page-about p a:hover {
  color: var(--white);
}

/* 起点时间线 */
.page-about .origin-track {
  list-style: none;
  margin: 0 0 34px;
  padding: 0 0 0 22px;
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .origin-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--green) 40%, var(--yellow) 72%, var(--red));
  opacity: 0.72;
}

.page-about .origin-node {
  position: relative;
}

.page-about .origin-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--blue-light);
}

.page-about .origin-node:nth-child(2)::before {
  border-color: var(--green);
}

.page-about .origin-node:nth-child(3)::before {
  border-color: var(--yellow);
}

.page-about .origin-node:nth-child(4)::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .origin-tag {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-deep);
  background: var(--yellow);
  padding: 2px 8px;
  border-radius: 999px;
}

.page-about .origin-node:nth-child(2) .origin-tag {
  background: var(--green);
  color: var(--white);
}

.page-about .origin-node:nth-child(3) .origin-tag {
  background: var(--blue);
  color: var(--white);
}

.page-about .origin-node:nth-child(4) .origin-tag {
  background: var(--orange);
  color: var(--ink-deep);
}

.page-about .origin-node h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .origin-node p {
  margin: 0;
  max-width: var(--measure);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* 图片容器补充 */
.page-about .media-frame {
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-deep);
}

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

.page-about .media-caption {
  display: block;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px solid var(--line);
  background: rgba(10, 23, 48, 0.7);
}

.page-about .origin-visual {
  display: grid;
  gap: 20px;
  align-items: start;
}

.page-about .origin-visual-text h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--glow);
}

.page-about .origin-visual-text p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

/* 主题簇 */
.page-about .cluster-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .cluster-item {
  background: var(--ink-deep);
  padding: 18px 18px 20px;
  position: relative;
  transition: background 200ms ease;
}

.page-about .cluster-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--blue);
  opacity: 0.7;
}

.page-about .cluster-item:nth-child(2)::before {
  background: var(--white);
}

.page-about .cluster-item:nth-child(3)::before {
  background: var(--red);
}

.page-about .cluster-item:nth-child(4)::before {
  background: var(--green);
}

.page-about .cluster-item:nth-child(5)::before {
  background: var(--yellow);
}

.page-about .cluster-item:nth-child(6)::before {
  background: var(--orange);
}

.page-about .cluster-item:hover {
  background: rgba(17, 42, 77, 0.85);
}

.page-about .cluster-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yellow);
  margin-bottom: 8px;
}

.page-about .cluster-item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .cluster-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 团队 */
.page-about .team-figure {
  margin-bottom: 22px;
}

.page-about .team-quad {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .team-cell {
  background: var(--ink-deep);
  padding: 20px 18px;
}

.page-about .team-cell--lead {
  background: linear-gradient(155deg, rgba(47, 107, 255, 0.28), rgba(10, 23, 48, 0.9) 72%);
}

.page-about .team-cell h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .team-cell p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .team-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--blue-light);
  border-top: 1px dashed var(--line-strong);
  padding-top: 10px;
  display: block;
}

.page-about .team-cell--lead .team-meta {
  color: var(--glow);
}

/* 版本时间轴 */
.page-about .version-track {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: grid;
  gap: 16px;
  position: relative;
}

.page-about .version-node {
  position: relative;
  padding: 16px 16px 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(17, 42, 77, 0.4);
  transition: border-color 200ms ease, transform 200ms ease;
}

.page-about .version-node:hover,
.page-about .version-node:focus-within {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .version-yr {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .version-node h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--white);
}

.page-about .version-node p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .version-visual {
  display: grid;
  gap: 20px;
  align-items: start;
}

.page-about .version-visual-text h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--glow);
}

.page-about .version-visual-text p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

/* 覆盖 */
.page-about .coverage-grid {
  display: grid;
  gap: 14px;
}

.page-about .coverage-card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .coverage-card:nth-child(2) {
  background: transparent;
}

.page-about .coverage-card:nth-child(3) {
  background: linear-gradient(165deg, rgba(47, 163, 107, 0.18), rgba(8, 20, 42, 0.9) 70%);
}

.page-about .coverage-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .coverage-card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid currentColor;
}

.page-about .tag--yellow {
  color: var(--yellow);
}

.page-about .tag--orange {
  color: var(--orange);
}

.page-about .tag--green {
  color: var(--green);
}

/* 合作矩阵 */
.page-about .partner-matrix {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .partner-item {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(10, 23, 48, 0.65);
  transition: border-color 200ms ease, background 200ms ease;
}

.page-about .partner-item:hover,
.page-about .partner-item:focus-within {
  border-color: var(--blue-light);
  background: rgba(17, 42, 77, 0.85);
}

.page-about .partner-type {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-deep);
  background: var(--glow);
  padding: 2px 9px;
  border-radius: 4px;
}

.page-about .partner-item:nth-child(2) .partner-type {
  background: var(--green);
  color: var(--white);
}

.page-about .partner-item:nth-child(3) .partner-type {
  background: var(--blue-light);
  color: var(--ink-deep);
}

.page-about .partner-item h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .partner-item p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .partner-more {
  display: block;
  font-size: 12px;
  line-height: 1.75;
  color: var(--blue-light);
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .partner-contact {
  padding: 20px 18px;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--orange);
  border-radius: var(--radius-sm);
  background: var(--panel);
}

.page-about .partner-contact p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .partner-contact strong {
  color: var(--white);
  font-family: var(--font-mono);
  font-weight: 700;
  word-break: break-all;
}

/* 里程碑 */
.page-about .mile-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .mile-item {
  background: var(--ink-deep);
  padding: 18px;
}

.page-about .mile-item:nth-child(odd) {
  background: rgba(17, 42, 77, 0.55);
}

.page-about .mile-item dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .mile-item dd {
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--orange);
}

.page-about .mile-item dd .num {
  font-size: 34px;
}

.page-about .mile-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .team-cell--lead {
    grid-column: span 2;
  }

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

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

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

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

  .page-about .origin-visual,
  .page-about .version-visual {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 26px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 72px) var(--gutter) 62px;
  }

  .page-about .about-shell {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 56px;
    padding-top: 64px;
    padding-bottom: 88px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-body {
    gap: 76px;
  }

  .page-about .cluster-item:nth-child(even) {
    padding-left: 26px;
  }

  .page-about .version-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .version-track::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 30px;
    height: 1px;
    background: linear-gradient(90deg, var(--blue), var(--green) 38%, var(--yellow) 70%, var(--orange));
    opacity: 0.6;
  }

  .page-about .version-node {
    padding-top: 34px;
  }

  .page-about .version-node::before {
    content: "";
    position: absolute;
    top: 24px;
    left: 18px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--ink-deep);
    border: 2px solid var(--yellow);
  }

  .page-about .version-node:nth-child(2)::before {
    border-color: var(--green);
  }

  .page-about .version-node:nth-child(3)::before {
    border-color: var(--orange);
  }

  .page-about .version-node:nth-child(4)::before {
    border-color: var(--white);
  }

  .page-about .mile-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .mile-item dd .num {
    font-size: 40px;
  }
}
<<<PAGE_CSS_END>>>
</main>