.page-about {
  --about-rail: 190px;
  --about-gap: clamp(20px, 3vw, 48px);
  --about-tone: rgba(245, 242, 234, .78);
  --about-panel-border: rgba(43, 58, 62, .95);

  display: block;
  position: relative;
  background:
    radial-gradient(760px 420px at 92% -6%, rgba(122, 92, 255, .16), transparent 64%),
    radial-gradient(640px 380px at -8% 24%, rgba(43, 240, 208, .07), transparent 62%),
    var(--c-night);
  color: var(--c-cream);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 3vw, 26px);
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .06em;
  color: var(--c-annot);
}

.page-about .breadcrumb a {
  color: var(--c-annot);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--c-cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 34px) 0 clamp(44px, 7vw, 84px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

.page-about .about-kicker {
  margin: 0 0 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(30px, 4.6vw, 54px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--c-cream);
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--about-tone);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__frame {
  display: grid;
  gap: 18px;
  padding: clamp(18px, 3vw, 28px);
  background: linear-gradient(155deg, rgba(15, 44, 39, .84), rgba(10, 23, 41, .68));
}

.page-about .about-hero__framebar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
}

.page-about .tick-label {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-annot);
}

.page-about .about-hero__clock {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .04em;
  color: var(--c-cyan);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}

.page-about .about-stat {
  border-top: 1px solid rgba(147, 167, 157, .24);
  padding-top: 12px;
}

.page-about .about-stat__key {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .1em;
  color: var(--c-annot);
}

.page-about .about-stat__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--c-amber);
}

.page-about .about-stat__val .data-unit {
  margin-left: 6px;
  font-size: 14px;
  letter-spacing: 0;
  color: var(--c-annot);
}

.page-about .about-hero__hint {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.7;
  color: var(--c-annot);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .about-story {
  padding: clamp(8px, 2vw, 20px) 0 clamp(40px, 6vw, 72px);
}

.page-about .story-track {
  position: relative;
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .story-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg,
      rgba(43, 240, 208, .55) 0%,
      rgba(122, 92, 255, .34) 46%,
      rgba(242, 178, 51, .45) 100%);
}

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

.page-about .story-node::after {
  content: "";
  position: absolute;
  left: -34px;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-clay);
  background: var(--c-night);
  box-shadow: 0 0 0 4px rgba(180, 115, 74, .14);
  transition: border-color var(--t), box-shadow var(--t), background-color var(--t);
}

.page-about .story-node:hover::after,
.page-about .story-node:focus-within::after {
  border-color: var(--c-cyan);
  background: rgba(43, 240, 208, .2);
  box-shadow: 0 0 0 5px rgba(43, 240, 208, .12);
}

.page-about .story-node__rail {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .story-node__year {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-cream);
}

.page-about .story-node__body {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--about-panel-border);
  border-radius: var(--r-panel);
  background: linear-gradient(158deg, rgba(15, 44, 39, .88), rgba(10, 23, 41, .74));
  transition: border-color var(--t);
}

.page-about .story-node__body::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(147, 167, 157, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(147, 167, 157, .07) 1px, transparent 1px);
  background-size: 38px 38px;
  -webkit-mask-image: radial-gradient(130% 110% at 100% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(130% 110% at 100% 0%, #000 0%, transparent 72%);
}

.page-about .story-node__body > * {
  position: relative;
  z-index: 1;
}

.page-about .story-node:hover .story-node__body {
  border-color: rgba(43, 240, 208, .38);
}

.page-about .story-node__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1.26;
  letter-spacing: .02em;
  color: var(--c-cream);
}

.page-about .story-text {
  margin: 0 0 14px;
  max-width: 68ch;
  line-height: 1.78;
  color: var(--about-tone);
}

.page-about .story-node__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px dashed rgba(147, 167, 157, .28);
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .04em;
  color: var(--c-annot);
}

.page-about .story-node__facts span::before {
  content: "— ";
  color: var(--c-clay);
}

/* 团队分工 */
.page-about .crew {
  display: grid;
  gap: 10px;
  margin: 22px 0;
}

.page-about .crew__lead {
  margin: 0 0 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-annot);
}

.page-about .crew-row {
  border: 1px solid rgba(43, 58, 62, .9);
  border-radius: var(--r-card);
  background: rgba(43, 58, 62, .2);
  overflow: hidden;
  transition: border-color var(--t), background-color var(--t);
}

.page-about .crew-row[open] {
  border-color: rgba(43, 240, 208, .34);
  background: rgba(43, 58, 62, .3);
}

.page-about .crew-row > summary {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--c-cream);
}

.page-about .crew-row > summary::-webkit-details-marker {
  display: none;
}

.page-about .crew-row > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-amber);
}

.page-about .crew-row[open] > summary::after {
  content: "–";
}

.page-about .crew-row > summary::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-moss), var(--c-cyan));
}

.page-about .crew-row--data > summary::before { width: 60%; }
.page-about .crew-row--care > summary::before { width: 16%; }
.page-about .crew-row--ops > summary::before { width: 23%; }

.page-about .crew-row__name {
  flex: 1 1 auto;
}

.page-about .crew-row__num {
  font-family: var(--font-mono);
  font-size: var(--fs-aux);
  letter-spacing: .04em;
  color: var(--c-cyan);
}

.page-about .crew-row__desc {
  margin: 0;
  padding: 0 18px 16px;
  max-width: 62ch;
  font-size: var(--fs-aux);
  line-height: 1.75;
  color: var(--c-annot);
}

/* 使用场景 */
.page-about .scene-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0;
}

.page-about .scene {
  padding: 16px 18px;
  border: 1px solid rgba(43, 58, 62, .9);
  border-left: 2px solid var(--c-moss);
  border-radius: 4px var(--r-card) var(--r-card) 4px;
  background: rgba(43, 58, 62, .18);
  transition: border-color var(--t), background-color var(--t);
}

.page-about .scene:hover {
  border-color: rgba(242, 178, 51, .48);
  border-left-color: var(--c-amber);
  background: rgba(43, 58, 62, .28);
}

.page-about .scene__who {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .12em;
  color: var(--c-amber);
}

.page-about .scene__txt {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.75;
  color: var(--about-tone);
}

/* 归档步骤 */
.page-about .step-list {
  display: grid;
  gap: 14px;
  margin: 22px 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .step__no {
  padding: 2px 10px;
  border: 1px solid rgba(43, 240, 208, .35);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--c-cyan);
}

.page-about .step__t {
  margin: 0 0 4px;
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--c-cream);
}

.page-about .step__d {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.75;
  color: var(--about-tone);
}

/* 配图 */
.page-about .about-shot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  border: 1px solid var(--about-panel-border);
  border-radius: var(--r-card);
  overflow: hidden;
  background: rgba(10, 23, 41, .6);
}

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

.page-about .about-shot__cap {
  margin: 0;
  padding: 10px 16px;
  border-top: 1px solid rgba(43, 58, 62, .8);
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .04em;
  color: var(--c-annot);
}

/* ---------- 里程碑带 ---------- */
.page-about .about-milestones {
  padding: clamp(40px, 7vw, 88px) 0 clamp(20px, 3vw, 32px);
}

.page-about .about-milestones__head {
  display: grid;
  gap: 8px;
}

.page-about .about-milestones .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-cream);
}

.page-about .about-milestones__sub {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.7;
  color: var(--c-annot);
}

.page-about .milestone-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 78vw);
  gap: 16px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0 0 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .milestone {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 18px;
  scroll-snap-align: start;
  border: 1px solid var(--about-panel-border);
  border-radius: var(--r-card);
  background: linear-gradient(165deg, rgba(15, 44, 39, .72), rgba(10, 23, 41, .6));
  transition: border-color var(--t), background-color var(--t);
}

.page-about .milestone:hover {
  border-color: rgba(122, 92, 255, .52);
  background: linear-gradient(165deg, rgba(15, 44, 39, .86), rgba(10, 23, 41, .7));
}

.page-about .milestone__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-amber);
}

.page-about .milestone__stage {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .milestone__txt {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.75;
  color: var(--about-tone);
}

/* ---------- 收尾 ---------- */
.page-about .about-return {
  padding: clamp(24px, 5vw, 56px) 0 0;
}

.page-about .about-return__panel {
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--about-panel-border);
  border-radius: var(--r-panel);
  background:
    radial-gradient(520px 300px at 88% 0%, rgba(242, 178, 51, .1), transparent 66%),
    linear-gradient(160deg, rgba(15, 44, 39, .9), rgba(10, 23, 41, .78));
}

.page-about .about-return__panel .panel__title {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 30px);
  letter-spacing: .03em;
  color: var(--c-cream);
}

.page-about .return-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.page-about .return-item {
  padding-top: 14px;
  border-top: 2px solid var(--c-cyan);
}

.page-about .return-item--amber { border-top-color: var(--c-amber); }
.page-about .return-item--violet { border-top-color: var(--c-violet); }

.page-about .return-item__k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: .18em;
  color: var(--c-annot);
}

.page-about .return-item__t {
  margin: 0;
  font-size: var(--fs-aux);
  line-height: 1.78;
  color: var(--about-tone);
}

.page-about .about-return__note {
  margin: 26px 0 0;
  max-width: 68ch;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--about-tone);
}

.page-about .about-return__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .page-about .story-node__facts {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .step {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (min-width: 720px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-milestones__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: 20px;
  }

  .page-about .milestone-strip {
    grid-auto-flow: row;
    grid-template-columns: repeat(auto-fit, minmax(205px, 1fr));
    grid-auto-columns: auto;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-about .return-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .story-track {
    padding-left: 0;
  }

  .page-about .story-track::before {
    left: calc(var(--about-rail) + var(--about-gap) / 2);
  }

  .page-about .story-node {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .story-node::after {
    left: calc(var(--about-rail) + var(--about-gap) / 2 - 7px);
    top: 6px;
  }

  .page-about .story-node__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 0;
    padding-top: 2px;
  }
}
<<<END>>>