.page-about {
  --about-space: clamp(38px, 6vw, 92px);
  --about-gap: clamp(20px, 3vw, 46px);
  padding-top: clamp(16px, 2.6vw, 34px);
  padding-bottom: clamp(56px, 9vw, 128px);
  color: var(--text-primary);
}

.page-about .about-crumbs {
  margin-bottom: clamp(14px, 2vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding-bottom: var(--about-space);
  align-items: start;
}

.page-about .about-kicker {
  color: var(--pulse-cyan);
  margin: 0 0 18px;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(36px, 5.6vw, 68px);
  font-weight: 250;
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.page-about .about-lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(16.5px, 1.4vw, 18.5px);
  line-height: 1.8;
  color: rgba(232, 237, 245, 0.8);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5px;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--edge-line);
  border: 1.5px solid var(--edge-line);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--cabin-panel);
}

.page-about .about-metric-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--pulse-cyan);
  letter-spacing: 0.02em;
}

.page-about .about-metric-key {
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--text-index);
}

/* ---------- 通用图片框 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 0;
  border: 1.5px solid var(--edge-line);
  background: var(--cabin-panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(158deg, rgba(0, 229, 255, 0.14), transparent 46%, rgba(124, 77, 255, 0.2));
  pointer-events: none;
}

.page-about .about-figure .media-caption {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 10px 14px;
  border-top: 1.5px solid var(--edge-line);
  background: rgba(5, 7, 12, 0.82);
  color: var(--text-index);
  letter-spacing: 0.06em;
}

.page-about .about-figure--band {
  margin-bottom: clamp(28px, 4vw, 52px);
  box-shadow: none;
}

.page-about .about-figure--band img {
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding-top: var(--about-space);
  border-top: var(--rule);
}

.page-about .about-section + .about-section {
  margin-top: var(--about-space);
}

.page-about .about-section-head {
  display: grid;
  gap: 12px;
  max-width: 64ch;
  margin-bottom: clamp(26px, 3.6vw, 48px);
}

.page-about .about-index {
  justify-self: start;
  padding: 5px 11px;
  border: 1.5px solid rgba(124, 77, 255, 0.5);
  background: rgba(124, 77, 255, 0.18);
  color: var(--mist-lilac);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.page-about .about-section-title {
  margin: 0;
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .about-section-note {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-index);
}

/* ---------- 主栏 + 侧栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-body p {
  margin: 0 0 1.1em;
  max-width: 68ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(232, 237, 245, 0.86);
}

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

.page-about .about-body a {
  color: var(--pulse-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-quote {
  margin: 26px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--pulse-cyan);
  background: var(--cabin-raised);
  box-shadow: var(--shadow-hard);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 52ch;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-primary);
}

.page-about .about-aside {
  padding-left: clamp(16px, 2vw, 26px);
  border-left: var(--rule);
}

.page-about .about-aside-label {
  margin: 0 0 16px;
  color: var(--mist-lilac);
}

.page-about .about-term-accordion .accordion-item + .accordion-item {
  margin-top: 10px;
}

.page-about .about-term-accordion .accordion-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-index);
}

.page-about .about-tail-note {
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding-top: 16px;
  max-width: 68ch;
  border-top: 1.5px solid var(--edge-line);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-index);
}

.page-about .about-tail-note a {
  color: var(--pulse-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 版本时间轴 ---------- */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 9px;
  width: 1.5px;
  background: linear-gradient(180deg, var(--pulse-cyan), var(--neon-violet) 58%, rgba(42, 51, 64, 0.5));
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 54px) 42px;
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-marker {
  position: absolute;
  top: 4px;
  left: 0;
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--edge-line);
  background: var(--void-black);
  transition: border-color var(--dur-panel) var(--ease-panel), box-shadow var(--dur-panel) var(--ease-panel), background var(--dur-panel) var(--ease-panel);
}

.page-about .tl-node.is-visible .tl-marker {
  border-color: var(--pulse-cyan);
  background: rgba(0, 229, 255, 0.16);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.1), 0 0 18px rgba(0, 229, 255, 0.32);
}

.page-about .tl-version {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 10px;
  border: 1.5px solid rgba(124, 77, 255, 0.5);
  background: rgba(124, 77, 255, 0.16);
  color: var(--mist-lilac);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: clamp(20px, 2vw, 25px);
  font-weight: 400;
  line-height: 1.34;
}

.page-about .tl-summary {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 15.8px;
  line-height: 1.8;
  color: rgba(232, 237, 245, 0.78);
}

.page-about .tl-body .accordion {
  max-width: 68ch;
}

.page-about .accordion-body p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--text-index);
}

.page-about .accordion-body a {
  color: var(--pulse-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 节点分层 ---------- */
.page-about .stack-scroll {
  overflow-x: auto;
  padding-bottom: 6px;
  border: 1.5px solid var(--edge-line);
  background: radial-gradient(120% 130% at 50% 0%, rgba(0, 229, 255, 0.08), transparent 62%), var(--cabin-panel);
}

.page-about .stack-figure {
  display: block;
  width: 100%;
  min-width: 560px;
  height: auto;
  padding: 18px;
}

.page-about .stack-layer {
  opacity: 0.58;
  transition: opacity var(--dur-panel) var(--ease-panel);
}

.page-about .stack-layer:hover,
.page-about .stack-layer:focus-within {
  opacity: 1;
}

.page-about .stack-layer rect {
  fill: rgba(11, 16, 24, 0.92);
  stroke: var(--edge-line);
  stroke-width: 1.5;
  transition: stroke var(--dur-panel) var(--ease-panel), fill var(--dur-panel) var(--ease-panel);
}

.page-about .stack-layer:hover rect {
  stroke: var(--pulse-cyan);
  fill: rgba(0, 229, 255, 0.07);
}

.page-about .stack-layer text {
  font-family: var(--font-mono);
}

.page-about .layer-name {
  fill: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .layer-num {
  fill: var(--pulse-cyan);
  font-size: 32px;
  font-weight: 600;
}

.page-about .layer-who {
  fill: var(--text-index);
  font-family: var(--font-cn);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.page-about .layer-list {
  display: grid;
  gap: 1.5px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--edge-line);
  border: 1.5px solid var(--edge-line);
}

.page-about .layer-item {
  padding: 20px 20px 22px;
  background: var(--cabin-panel);
}

.page-about .layer-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--pulse-cyan);
}

.page-about .layer-item p {
  margin: 0;
  max-width: 72ch;
  font-size: 15.4px;
  line-height: 1.78;
  color: rgba(232, 237, 245, 0.76);
}

/* ---------- 审计 ---------- */
.page-about .audit-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-figure--audit {
  box-shadow: var(--shadow-hard);
}

.page-about .audit-copy p:first-child {
  margin-top: 0;
}

.page-about .audit-checks {
  display: grid;
  gap: 1.5px;
  margin: clamp(28px, 3.6vw, 46px) 0 0;
  padding: 0;
  background: var(--edge-line);
  border: 1.5px solid var(--edge-line);
}

.page-about .audit-check {
  padding: 20px 20px 22px;
  background: var(--cabin-panel);
}

.page-about .audit-check dt {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--mist-lilac);
}

.page-about .audit-check dd {
  margin: 0;
  max-width: 68ch;
  font-size: 15.4px;
  line-height: 1.78;
  color: rgba(232, 237, 245, 0.76);
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  display: grid;
  gap: 1.5px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--edge-line);
  border: 1.5px solid var(--edge-line);
}

.page-about .team-item {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--cabin-panel);
}

.page-about .team-code {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--amber-alert);
}

.page-about .team-name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 400;
}

.page-about .team-item p {
  margin: 0;
  font-size: 15.2px;
  line-height: 1.78;
  color: rgba(232, 237, 245, 0.74);
}

.page-about .cadence {
  margin-top: clamp(26px, 3.4vw, 42px);
  padding: clamp(20px, 2.6vw, 30px);
  border: 1.5px solid var(--edge-line);
  border-top: 3px solid var(--amber-alert);
  background: var(--cabin-raised);
}

.page-about .cadence-label {
  margin: 0 0 16px;
  color: var(--amber-alert);
}

.page-about .cadence-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cadence-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  font-size: 15.2px;
  line-height: 1.7;
  color: rgba(232, 237, 245, 0.82);
}

.page-about .cadence-cycle {
  flex: 0 0 auto;
  padding: 2px 9px;
  border: 1.5px solid var(--edge-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--pulse-cyan);
}

.page-about .cadence-note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1.5px solid var(--edge-line);
  font-size: 14.6px;
  line-height: 1.78;
  color: var(--text-index);
}

/* ---------- 材料领取 ---------- */
.page-about .claim-panel {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  padding: clamp(22px, 3vw, 38px);
  border-left: 4px solid var(--pulse-cyan);
}

.page-about .claim-body p {
  margin: 0 0 1em;
  max-width: 68ch;
  font-size: 15.8px;
  line-height: 1.82;
  color: rgba(232, 237, 245, 0.84);
}

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

.page-about .claim-body a {
  color: var(--pulse-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .claim-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

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

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

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.38fr) minmax(260px, 0.62fr);
  }

  .page-about .audit-grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }

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

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

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

@media (max-width: 759px) {
  .page-about .about-aside {
    padding-left: 0;
    padding-top: 20px;
    border-left: 0;
    border-top: var(--rule);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}