.page-about {
  --about-rail: 21px;
  --about-marker: 42px;
  position: relative;
  overflow-x: hidden;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(30, 43, 69, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 43, 69, 0.5) 1px, transparent 1px);
  background-size: 88px 88px;
  color: var(--paper);
  font-family: var(--font-body);
}

.page-about .about-crumb {
  padding-top: 26px;
}

.page-about .about-crumb .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-crumb .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-crumb .breadcrumbs a:hover,
.page-about .about-crumb .breadcrumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-crumb .breadcrumbs__sep {
  color: var(--line);
}

/* 首屏 */
.page-about .about-intro {
  padding: 36px 0 52px;
}

.page-about .about-intro__grid {
  display: grid;
  gap: 32px;
}

.page-about .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about h1 {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-size: clamp(30px, 8vw, 52px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-intro__lede {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-intro__sub {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-intro__panel {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-intro__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, var(--cyan), var(--lava));
}

.page-about .about-intro__panel-title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-keyfacts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-keyfacts li {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.page-about .about-keyfacts .num {
  font-family: var(--font-mono);
  font-size: 25px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-keyfacts__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

/* 时间线主体 */
.page-about .about-timeline {
  padding: 8px 0 24px;
}

.page-about .about-track {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 40px;
  left: var(--about-rail);
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--line) 18%, var(--line) 82%, var(--lava));
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-marker) minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: 44px;
}

.page-about .about-node__marker {
  grid-column: 1;
  display: grid;
  place-items: center;
  width: var(--about-marker);
  height: var(--about-marker);
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan);
  transition: border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-node:hover .about-node__marker {
  border-color: var(--lava);
  color: var(--lava);
  box-shadow: 0 0 0 6px rgba(255, 106, 43, 0.1);
}

.page-about .about-node__body {
  grid-column: 2;
  min-width: 0;
}

.page-about .about-node__stamp {
  margin: 6px 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lava);
}

.page-about .about-node h2 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: clamp(21px, 5vw, 30px);
  font-weight: 700;
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-node p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: #cfdcef;
}

.page-about .about-node p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 224, 255, 0.45);
  transition: border-color 0.25s ease, color 0.25s ease;
}

.page-about .about-node p a:hover,
.page-about .about-node p a:focus-visible {
  color: var(--lava);
  border-bottom-color: var(--lava);
}

/* 刻度分隔线 */
.page-about .about-rule {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 40px;
  padding-left: calc(var(--about-marker) + 16px);
}

.page-about .about-rule::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background-image: repeating-linear-gradient(to right, var(--line) 0 6px, transparent 6px 13px);
}

.page-about .about-rule span {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

/* 图片 */
.page-about .about-figure {
  margin: 24px 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .about-figure .figure__media {
  overflow: hidden;
}

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

.page-about .about-figure .figure__caption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* 版本列表 */
.page-about .about-versions {
  display: grid;
  gap: 10px;
  margin: 20px 0 8px;
  padding: 0;
  list-style: none;
}

.page-about .about-version {
  display: grid;
  gap: 7px;
  padding: 14px 16px;
  border-left: 2px solid var(--line);
  background: rgba(19, 28, 48, 0.55);
  transition: border-color 0.28s ease, background-color 0.28s ease;
}

.page-about .about-version:hover {
  border-left-color: var(--cyan);
  background: var(--glass);
}

.page-about .about-version__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-version__no {
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--lava);
}

.page-about .about-version__name {
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-version__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* 数据索引 */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 22px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-metric {
  display: grid;
  gap: 8px;
  padding: 18px 16px;
  background: var(--ink-800);
  min-width: 0;
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-size: 27px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-metric__label {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* 玻璃信息卡 */
.page-about .about-glass {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 22px;
  padding: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-glass__item {
  display: grid;
  gap: 8px;
  padding: 18px 16px;
  background: var(--glass);
  min-width: 0;
}

.page-about .about-glass__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-glass__text {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 后续入口 */
.page-about .about-next {
  margin-top: 16px;
  padding: 46px 0 64px;
  border-top: 1px solid var(--line);
  background: linear-gradient(to bottom, rgba(13, 20, 36, 0.9), var(--ink-900));
}

.page-about .about-next__title {
  margin: 0 0 22px;
  font-family: var(--font-serif);
  font-size: clamp(20px, 4.6vw, 26px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-next__links {
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.28s ease, background-color 0.28s ease, transform 0.28s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
  background: var(--glass);
  transform: translateX(4px);
}

.page-about .about-next__link-label {
  display: block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 5px;
}

.page-about .about-next__link-desc {
  display: block;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-next__arrow {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--lava);
}

.page-about .about-seal {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px dashed var(--line);
}

.page-about .about-seal__mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border: 1px solid rgba(255, 106, 43, 0.6);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.45;
  letter-spacing: 0.08em;
  text-align: center;
  color: var(--lava);
  opacity: 0.85;
}

.page-about .about-seal__text {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

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

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

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

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

@media (min-width: 960px) {
  .page-about {
    --about-rail: 29px;
    --about-marker: 58px;
  }

  .page-about .about-crumb {
    padding-top: 38px;
  }

  .page-about .about-intro {
    padding: 52px 0 72px;
  }

  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-intro__panel {
    padding: 26px 24px 28px;
  }

  .page-about .about-node {
    column-gap: 28px;
    padding-bottom: 64px;
  }

  .page-about .about-node__marker {
    font-size: 14px;
  }

  .page-about .about-node__body {
    max-width: 74ch;
  }

  .page-about .about-rule {
    margin-bottom: 56px;
    padding-left: calc(var(--about-marker) + 28px);
  }

  .page-about .about-versions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-next {
    padding: 62px 0 84px;
  }

  .page-about .about-seal {
    margin-top: 52px;
  }
}
<<<END>>>