.page-about {
  --about-rail-w: 268px;
  --about-gap: 44px;
  background: var(--ink-950);
  color: var(--text-hi);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 40px) 0 48px;
  background:
    radial-gradient(120% 90% at 82% 12%, rgba(43, 240, 208, 0.14) 0%, rgba(5, 10, 30, 0) 62%),
    linear-gradient(160deg, var(--ink-950) 0%, var(--ink-900) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-700) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-700) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.22;
  pointer-events: none;
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-about .about-hero-slash {
  position: absolute;
  right: -8%;
  bottom: -14%;
  width: 52%;
  height: 118%;
  background: linear-gradient(200deg, rgba(122, 92, 255, 0.28) 0%, rgba(43, 240, 208, 0.12) 58%, rgba(5, 10, 30, 0) 100%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  margin-bottom: 26px;
  font-size: 13px;
  color: var(--text-mid);
}

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

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-700);
}

.page-about .breadcrumb-list a {
  color: var(--text-mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .breadcrumb-list a:hover {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-hero h1 {
  margin: 18px 0 0;
  max-width: 15em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(32px, 7vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--text-hi);
}

.page-about .about-hero-lead {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.72;
  color: var(--text-mid);
}

.page-about .hero-stats {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-900);
}

.page-about .hero-stat .num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 36px);
  font-weight: 700;
  color: var(--cyan-400);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.page-about .hero-stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-mid);
}

/* ============ 布局：侧栏 + 叙事流 ============ */
.page-about .about-layout {
  padding: 56px var(--gutter) 24px;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 40px;
}

.page-about .rail-card {
  background: var(--ink-800);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  box-shadow: var(--shadow-card);
}

.page-about .rail-card--quiet {
  background: transparent;
  box-shadow: none;
}

.page-about .rail-kicker {
  margin: 0 0 16px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cyan-700);
}

.page-about .rail-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .rail-list li {
  display: grid;
  grid-template-columns: minmax(0, 4.4em) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-hi);
  font-variant-numeric: tabular-nums;
}

.page-about .rail-text {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-mid);
}

.page-about .rail-card .divider {
  margin: 18px 0 14px;
  height: 1px;
  background: var(--line-700);
}

.page-about .rail-card .card-note {
  margin: 0 0 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--cyan-400);
  font-size: 13px;
  line-height: 1.62;
  color: var(--text-mid);
}

.page-about .rail-jump {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .rail-jump a {
  display: block;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-hi);
  text-decoration: none;
  padding-left: 14px;
  position: relative;
  transition: color 180ms ease;
}

.page-about .rail-jump a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 1px;
  background: var(--cyan-700);
  transition: width 180ms ease, background 180ms ease;
}

.page-about .rail-jump a:hover {
  color: var(--cyan-400);
}

.page-about .rail-jump a:hover::before {
  width: 10px;
  background: var(--cyan-400);
}

/* 叙事流：纵向时间轴 */
.page-about .about-stream {
  position: relative;
  padding-left: 30px;
}

.page-about .about-stream::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-400) 0%, var(--cyan-700) 38%, var(--violet-500) 74%, transparent 100%);
  opacity: 0.7;
}

.page-about .stream-block {
  position: relative;
  padding: 0 0 54px;
}

.page-about .stream-block::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 12px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(43, 240, 208, 0.12);
}

.page-about .stream-block--last::before {
  border-color: var(--orange-500);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.14);
}

.page-about .stream-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .stream-idx {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
  flex: none;
}

.page-about .stream-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 4.6vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--text-hi);
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.72;
  color: var(--text-mid);
  max-width: 44em;
}

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

.page-about .inline-quote {
  margin: 22px 0 0;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: linear-gradient(120deg, rgba(43, 240, 208, 0.09), rgba(122, 92, 255, 0.09));
  border: 1px solid var(--line-700);
}

.page-about .inline-quote p {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text-hi);
}

.page-about .quote-attr {
  font-size: 12.5px;
  color: var(--cyan-400);
  letter-spacing: 0.06em;
}

.page-about .about-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.95) contrast(1.04);
}

.page-about .about-figure--wide {
  margin-top: 30px;
}

/* 轮班条 */
.page-about .shift-strip {
  margin-top: 26px;
  display: grid;
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .shift-item {
  padding: 16px 16px 18px;
  background: var(--ink-900);
}

.page-about .shift-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange-500);
  margin-bottom: 8px;
}

.page-about .shift-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--text-mid);
}

/* 流程步骤 */
.page-about .flow-steps {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  counter-reset: flow;
}

.page-about .flow-step {
  position: relative;
  padding: 20px 20px 20px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--cyan-700);
  transition: border-left-color 200ms ease, transform 200ms ease;
}

.page-about .flow-step:hover {
  border-left-color: var(--cyan-400);
  transform: translateY(-2px);
}

.page-about .flow-num {
  display: block;
  font-size: 13px;
  color: var(--cyan-400);
  margin-bottom: 8px;
}

.page-about .flow-step h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-hi);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-mid);
}

.page-about .note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan-400);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-mid);
}

/* 拓扑图 */
.page-about .topo {
  margin: 26px 0 0;
  padding: 18px 12px;
  background: var(--ink-900);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-lg);
}

.page-about .topo-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 720px;
  margin: 0 auto;
}

.page-about .topo-edge {
  fill: none;
  stroke-width: 1.6;
  stroke-dasharray: 4 5;
}

.page-about .topo-node rect {
  fill: var(--ink-800);
  stroke: var(--line-700);
  stroke-width: 1.4;
}

.page-about .topo-node text {
  font-family: var(--font-body);
  font-size: 15px;
  fill: var(--text-hi);
}

.page-about .topo-node--root rect {
  fill: rgba(43, 240, 208, 0.14);
  stroke: var(--cyan-400);
}

.page-about .topo-node--root text {
  fill: var(--cyan-400);
  font-weight: 700;
}

.page-about .topo-node--leaf rect {
  fill: rgba(122, 92, 255, 0.12);
  stroke: rgba(122, 92, 255, 0.6);
}

.page-about .topo-node--leaf text {
  fill: #c9bcff;
}

/* 栏目地图卡片 */
.page-about .section-map {
  margin-top: 26px;
  display: grid;
  gap: 14px;
}

.page-about .map-card {
  display: block;
  padding: 20px 20px 22px;
  background: var(--ink-900);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition: border-color 200ms ease, background 200ms ease, transform 200ms ease;
}

.page-about .map-card:hover,
.page-about .map-card:focus-visible {
  border-color: var(--cyan-700);
  background: var(--ink-800);
  transform: translateY(-2px);
}

.page-about .map-card-idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-500);
  margin-bottom: 10px;
}

.page-about .map-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-hi);
}

.page-about .map-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-mid);
}

/* 覆盖范围 */
.page-about .coverage-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .coverage-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-900);
}

.page-about .coverage-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-num .unit {
  font-size: 0.56em;
  margin-left: 3px;
  color: var(--cyan-700);
}

.page-about .coverage-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-mid);
}

/* 联系 */
.page-about .contact-row {
  margin-top: 24px;
  display: grid;
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .contact-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-800);
}

.page-about .contact-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-mid);
}

.page-about .contact-value {
  font-size: 15px;
  color: var(--text-hi);
  word-break: break-word;
}

.page-about .contact-cta {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 版本演进带 ============ */
.page-about .release-band {
  margin-top: 20px;
  padding: 62px 0 68px;
  background:
    linear-gradient(120deg, rgba(255, 122, 47, 0.08) 0%, rgba(43, 240, 208, 0.06) 46%, rgba(5, 10, 30, 0) 100%),
    var(--ink-900);
  border-top: 1px solid var(--line-700);
  border-bottom: 1px solid var(--line-700);
}

.page-about .section-head {
  margin-bottom: 26px;
}

.page-about .section-idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange-500);
  margin-bottom: 12px;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(26px, 5.4vw, 40px);
  line-height: 1.16;
  color: var(--text-hi);
}

.page-about .section-lead {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-mid);
}

.page-about .band-figure {
  margin: 0 0 34px;
  border: 1px solid var(--line-700);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .band-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.86;
}

.page-about .release-track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 20px;
}

.page-about .release-node {
  position: relative;
  padding: 20px 20px 22px;
  background: rgba(17, 28, 66, 0.72);
  border: 1px solid var(--line-700);
  border-radius: var(--radius-md);
}

.page-about .release-node--current {
  background: linear-gradient(140deg, rgba(43, 240, 208, 0.14), rgba(17, 28, 66, 0.9));
  border-color: var(--cyan-700);
  box-shadow: var(--shadow-glow);
}

.page-about .release-ver {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
  margin-bottom: 10px;
}

.page-about .release-node--current .release-ver {
  color: var(--orange-500);
}

.page-about .release-node h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-hi);
}

.page-about .release-node p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-mid);
}

/* ============ 动画钩子 ============ */
.page-about [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .has-js .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 420ms ease, transform 420ms ease;
  }
  .has-js .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

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

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

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

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

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

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

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
    padding-top: 72px;
    padding-bottom: 40px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h-solid) + 24px);
    margin-bottom: 0;
  }

  .page-about .about-stream {
    padding-left: 36px;
  }

  .page-about .stream-block::before {
    left: -36px;
  }

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

  .page-about .release-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .release-node::after {
    content: "";
    position: absolute;
    top: 46px;
    right: -18px;
    width: 18px;
    height: 1px;
    background: var(--line-700);
  }

  .page-about .release-node:last-child::after {
    display: none;
  }
}

@media (min-width: 1200px) {
  .page-about .about-layout {
    --about-rail-w: 292px;
    --about-gap: 56px;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>