.page-about {
  --year-w: 62px;
  --about-line: 1px solid var(--line);
  position: relative;
  isolation: isolate;
  overflow-x: clip;
  background: var(--bg);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 72vh;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 100% 92px, 92px 100%;
  opacity: 0.5;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 55%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 55%, transparent 100%);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: var(--about-line);
}

.page-about .about-hero-inner {
  display: grid;
  gap: clamp(26px, 5vw, 44px);
  padding-block: clamp(30px, 6vw, 64px) clamp(30px, 5vw, 52px);
}

.page-about .eyebrow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
  text-transform: uppercase;
}

.page-about .eyebrow-tag {
  display: inline-block;
  padding: 3px 8px;
  background: var(--cyan);
  color: var(--ink);
  letter-spacing: 0.08em;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 15em;
}

.page-about .about-lede {
  margin: 0 0 24px;
  max-width: 44em;
  font-size: clamp(15px, 2.1vw, 17.5px);
  line-height: 1.8;
  color: rgba(247, 251, 253, 0.82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

.page-about .hero-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 14px 12px;
  background: var(--panel-deep);
}

.page-about .hero-stat dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1;
  color: var(--paper);
}

.page-about .hero-stat:first-child dd {
  color: var(--gold);
}

.page-about .hero-stat .stat-unit {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--steel);
  margin-left: 2px;
}

.page-about .hero-stat .stat-sep {
  color: var(--coral);
  margin: 0 2px;
}

.page-about .hero-stat dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  padding-top: clamp(26px, 4.5vw, 48px);
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-block: 12px;
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .rail-title {
  display: none;
  margin: 0;
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .chapter-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding-bottom: 2px;
}

.page-about .chapter-rail::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-link {
  flex: 0 0 auto;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: var(--panel-deep);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .chapter-link:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .chapter-link.is-current,
.page-about .chapter-link[aria-current] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .rail-meta {
  display: none;
  margin: 0;
  font-size: 10.5px;
  line-height: 1.8;
  letter-spacing: 0.12em;
  color: var(--line);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(28px, 4.6vw, 48px);
  border-top: var(--about-line);
  scroll-margin-top: 88px;
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .section-head {
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .section-head .eyebrow {
  margin-bottom: 8px;
  color: var(--cyan);
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.005em;
  color: var(--paper);
  max-width: 20em;
}

.page-about .about-sub {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 44em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(247, 251, 253, 0.84);
}

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

/* ---------- 起点 ---------- */
.page-about .origin-split {
  display: grid;
  gap: clamp(20px, 4vw, 34px);
}

.page-about .origin-points {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px dashed var(--line);
}

.page-about .origin-points li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
  line-height: 1.68;
  color: rgba(247, 251, 253, 0.86);
}

.page-about .point-mark {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  margin-top: 8px;
  background: var(--coral);
  transform: rotate(45deg);
}

/* ---------- 媒体 ---------- */
.page-about .media-frame {
  position: relative;
  overflow: hidden;
  background: var(--panel-deep);
  border: var(--about-line);
}

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

.page-about .media-caption {
  margin: 9px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--steel);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-list {
  position: relative;
  margin: 0;
  padding: 0;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: var(--year-w);
  width: 1px;
  background: linear-gradient(180deg, transparent 0%, var(--line) 5%, var(--line) 95%, transparent 100%);
}

.page-about .mile {
  position: relative;
  display: grid;
  grid-template-columns: var(--year-w) minmax(0, 1fr);
  column-gap: clamp(16px, 3vw, 30px);
  padding-bottom: clamp(20px, 3.4vw, 32px);
}

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

.page-about .mile::before {
  content: "";
  position: absolute;
  top: 5px;
  left: calc(var(--year-w) - 5px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--cyan);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .mile-year {
  padding-top: 1px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--steel);
  transition: color 0.2s var(--ease);
}

.page-about .mile-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.9vw, 21px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .mile-text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.78;
  color: rgba(247, 251, 253, 0.78);
}

.page-about .mile:hover .mile-year {
  color: var(--cyan);
}

.page-about .mile:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(40, 224, 210, 0.14);
}

.page-about .timeline-figure {
  margin: 0 0 clamp(20px, 3.4vw, 30px);
  padding-left: 0;
}

/* ---------- 档案分类 ---------- */
.page-about .archive-taxonomy {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  border-top: var(--about-line);
}

.page-about .taxo {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .taxo-num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .taxo-name {
  margin: 0 0 3px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .taxo-note {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .archive-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--about-line);
}

.page-about .fact {
  padding: 14px 12px;
  background: var(--panel);
}

.page-about .fact-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 4vw, 28px);
  line-height: 1.1;
  color: var(--gold);
}

.page-about .fact-plus {
  font-size: 0.7em;
  margin-left: 1px;
}

.page-about .fact-label {
  display: block;
  margin-top: 5px;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: clamp(20px, 4vw, 34px);
}

.page-about .crew-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px dashed var(--line);
}

.page-about .crew-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.2px;
  line-height: 1.66;
  color: rgba(247, 251, 253, 0.84);
}

.page-about .crew-list li::before {
  content: "//";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.9;
  color: var(--cyan);
}

.page-about .partner-strip {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 28px);
  background: var(--line);
  border: var(--about-line);
}

.page-about .partner-chip {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px;
  background: var(--panel-deep);
}

.page-about .chip-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .chip-label {
  font-size: 13.2px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 资质折叠 ---------- */
.page-about .honor-list {
  border-top: var(--about-line);
}

.page-about .honor-item {
  border-bottom: var(--about-line);
}

.page-about .honor-summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 5px 14px;
  padding: 15px 32px 15px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .honor-summary::-webkit-details-marker {
  display: none;
}

.page-about .honor-year {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .honor-name {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(15px, 2.7vw, 18px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .honor-mark {
  position: absolute;
  right: 4px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
}

.page-about .honor-mark::before,
.page-about .honor-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.page-about .honor-mark::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 1px;
}

.page-about .honor-mark::after {
  left: 5px;
  top: 0;
  width: 1px;
  height: 12px;
  transition: transform 0.2s var(--ease);
}

.page-about .honor-item[open] .honor-mark::after {
  transform: scaleY(0);
}

.page-about .honor-item[open] .honor-summary {
  color: var(--cyan);
}

.page-about .honor-body {
  padding: 0 0 16px;
}

.page-about .honor-body p {
  margin: 0;
  font-size: 14.2px;
  line-height: 1.78;
  color: rgba(247, 251, 253, 0.78);
}

/* ---------- 未来节奏 ---------- */
.page-about .reason-list {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: var(--about-line);
}

.page-about .reason {
  padding: 18px 16px;
  background: var(--panel-deep);
}

.page-about .reason-num {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--coral);
}

.page-about .reason h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .reason p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-cta {
  display: grid;
  gap: 16px;
  margin-top: clamp(22px, 3.6vw, 32px);
  padding: clamp(18px, 3.4vw, 28px);
  border: var(--about-line);
  border-left: 3px solid var(--coral);
  background: linear-gradient(120deg, rgba(12, 42, 66, 0.95), rgba(6, 26, 43, 0.55));
}

.page-about .cta-text {
  margin: 0;
  max-width: 46em;
  font-size: 14.8px;
  line-height: 1.8;
  color: rgba(247, 251, 253, 0.84);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 480px) {
  .page-about {
    --year-w: 82px;
  }

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

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

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

@media (min-width: 760px) {
  .page-about .origin-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .timeline-figure {
    margin-left: calc(var(--year-w) + clamp(16px, 3vw, 30px));
  }

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

  .page-about .prose p {
    font-size: 16.2px;
  }

  .page-about .mile-text {
    font-size: 15.2px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    column-gap: clamp(28px, 4vw, 52px);
  }
}

@media (min-width: 960px) {
  .page-about {
    --year-w: 96px;
  }

  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    gap: 0;
    padding: 16px 14px;
    border: var(--about-line);
    border-top: 2px solid var(--cyan);
    background: var(--panel-deep);
  }

  .page-about .rail-title {
    display: block;
    margin-bottom: 10px;
  }

  .page-about .chapter-rail {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .chapter-link {
    padding: 8px 10px;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    font-size: 12px;
    letter-spacing: 0.04em;
  }

  .page-about .chapter-link.is-current,
  .page-about .chapter-link[aria-current] {
    background: rgba(40, 224, 210, 0.1);
    border-left-color: var(--cyan);
    color: var(--cyan);
  }

  .page-about .rail-meta {
    display: block;
    margin-top: 14px;
  }

  .page-about .about-sec {
    scroll-margin-top: 100px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-link,
  .page-about .mile::before,
  .page-about .mile-year,
  .page-about .honor-mark::after {
    transition: none;
  }
}
<<<END>>>