.page-about {
  --about-rail: 224px;
  --about-gap: clamp(24px, 4vw, 64px);
  background: var(--ink);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3vw, 36px) 0 clamp(32px, 5vw, 72px);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(43, 243, 196, 0.10), transparent 62%),
    linear-gradient(180deg, #0E2A24 0%, var(--ink) 78%);
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 4vw, 44px);
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  max-width: 22ch;
  margin: 0 0 20px;
  font-size: clamp(30px, 6vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-hero .lede {
  max-width: 62ch;
  color: var(--moss);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .hero-fact-num {
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .hero-fact-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--moss);
}

/* ---------- 骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-block: clamp(24px, 4vw, 48px) clamp(36px, 5vw, 72px);
}

.page-about .about-shell--lower {
  padding-top: 0;
}

/* ---------- 左侧导览 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .rail-kicker {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--moss);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: background var(--t) var(--ease), color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  background: var(--glass);
  border-color: var(--glass);
  color: var(--paper);
}

.page-about .rail-num {
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .rail-note {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--moss);
}

.page-about .rail-note a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t) var(--ease);
}

.page-about .rail-note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 正文列 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-body section {
  padding-block: clamp(30px, 4.5vw, 56px);
}

.page-about .about-body section + section {
  border-top: 1px solid var(--line);
}

.page-about .section-index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-body h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 700;
}

.page-about .about-body h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-about .about-body p {
  margin: 0 0 14px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .prose p {
  color: #D8E8E3;
  max-width: 66ch;
}

.page-about .section-lede {
  max-width: 60ch;
  color: var(--moss);
}

.page-about .about-link {
  margin-top: 20px;
}

.page-about .about-link .btn {
  text-decoration: none;
}

/* ---------- 编辑组 ---------- */
.page-about .crew-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
  margin-top: 26px;
}

.page-about .crew-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .crew-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .crew-item p {
  margin: 0;
  color: var(--moss);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .crew-num {
  font-size: 22px;
  line-height: 1.15;
  color: var(--amber);
}

.page-about .crew-media {
  margin: 0;
}

.page-about .crew-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 2px;
  display: block;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--moss);
}

/* ---------- 覆盖规模 ---------- */
.page-about .scale-band {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  border-block: 1px solid var(--line);
  padding-block: clamp(38px, 6vw, 78px);
  isolation: isolate;
}

.page-about .scale-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .scale-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: saturate(0.6) contrast(1.1);
}

.page-about .scale-band::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(11, 31, 26, 0.92), rgba(16, 48, 42, 0.72) 55%, rgba(11, 31, 26, 0.95));
}

.page-about .scale-inner h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.page-about .scale-lede {
  max-width: 58ch;
  color: var(--moss);
  line-height: 1.8;
}

.page-about .metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0 0;
  border-top: 1px solid rgba(141, 251, 224, 0.22);
  transition: border-color var(--t) var(--ease);
}

.page-about .metric:hover,
.page-about .metric:focus-visible {
  border-top-color: var(--cyan);
  outline: none;
}

.page-about .metric-value {
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .metric-suffix {
  font-size: 0.48em;
  margin-left: 2px;
  color: var(--cyan-soft);
}

.page-about .metric-unit {
  font-size: 13px;
  color: var(--paper);
  letter-spacing: 0.04em;
}

.page-about .metric-note {
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--moss);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity var(--t) var(--ease), max-height var(--t) var(--ease);
}

.page-about .metric:hover .metric-note,
.page-about .metric:focus-visible .metric-note,
.page-about .metric:focus-within .metric-note {
  opacity: 1;
  max-height: 6em;
}

/* ---------- 三道工序 ---------- */
.page-about .review-stages {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 26px;
  position: relative;
}

.page-about .stage {
  border-radius: 2px;
  border-left: 2px solid var(--line);
  background: transparent;
  transition: background var(--t) var(--ease), border-left-color var(--t) var(--ease);
}

.page-about .stage[open] {
  background: rgba(23, 69, 60, 0.35);
  border-left-color: var(--cyan);
}

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

.page-about .stage summary {
  display: grade;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage-num {
  font-size: 12px;
  color: var(--cyan);
}

.page-about .stage-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .stage-hint {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--moss);
}

.page-about .stage-body {
  padding: 0 16px 16px 60px;
}

.page-about .stage-body p {
  margin: 0 0 10px;
  color: #D8E8E3;
  font-size: 14px;
  line-height: 1.75;
}

.page-about .stage-body ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .stage-body li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
}

.page-about .stage-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  border-radius: 1px;
}

.page-about .review-fix {
  margin-top: 28px;
  padding-left: 16px;
  border-left: 2px solid var(--rose);
}

.page-about .review-fix h3 {
  color: var(--paper);
}

.page-about .review-fix p {
  color: var(--moss);
  font-size: 14px;
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .review-media {
  margin: clamp(24px, 4vw, 40px) 0 0;
  max-width: 420px;
}

.page-about .review-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 2px;
  display: block;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  position: relative;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 70%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 42px) 28px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
}

.page-about .tl-item--now::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: var(--amber);
  border-radius: 2px;
}

.page-about .tl-item--now .tl-year {
  color: var(--ink);
  background: var(--cyan);
}

.page-about .tl-item p {
  margin: 0;
  max-width: 62ch;
  color: var(--moss);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 准则 ---------- */
.page-about .rule-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .rule-list li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .rule-num {
  font-size: 13px;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .rule-list p {
  margin: 0;
  color: #D8E8E3;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-cta p {
  margin: 0 0 16px;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.75;
}

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

.page-about .about-cta-actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 28px;
  }

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

  .page-about .rule-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 48px);
  }
}

@media (min-width: 900px) {
  .page-about .crew-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
  }

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

  .page-about .review-stages::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan), rgba(43, 243, 196, 0.15));
  }

  .page-about .stage {
    border-left: 0;
    border-top: 2px solid var(--line);
    padding-top: 10px;
  }

  .page-about .stage[open],
  .page-about .stage:hover {
    border-left: 0;
    border-top-color: var(--cyan);
  }

  .page-about .stage summary {
    grid-template-columns: 32px minmax(0, 1fr);
    padding: 12px 8px 4px;
  }

  .page-about .stage-hint {
    grid-column: 2;
    display: block;
    margin-top: -6px;
  }

  .page-about .stage-body {
    padding: 6px 8px 14px 40px;
  }
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .rail-list {
    display: block;
    position: relative;
    overflow: visible;
    padding: 0 0 0 0;
  }

  .page-about .rail-list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--line);
  }

  .page-about .rail-link {
    position: relative;
    display: flex;
    padding: 10px 10px 10px 26px;
    border: 0;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 9px;
    height: 9px;
    margin-top: -4px;
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--line);
    transition: background var(--t) var(--ease), border-color var(--t) var(--ease);
  }

  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    background: var(--cyan);
    border-color: var(--cyan);
  }

  .page-about .review-media {
    max-width: 520px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .metric,
  .page-about .stage,
  .page-about .metric-note,
  .page-about .rail-link::before {
    transition: none;
  }
}
<<<END>>>