.page-about {
  --about-rail: 216px;
  --about-sticky: 140px;
  display: block;
  background: var(--void-black);
  color: var(--text-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 52px) 0 clamp(30px, 5vw, 56px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(53, 242, 192, 0.10), transparent 58%),
    linear-gradient(180deg, var(--pitch-deep) 0%, var(--void-black) 80%);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(53, 242, 192, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(53, 242, 192, 0.055) 1px, transparent 1px);
  background-size: 104px 104px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
}

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

.page-about .breadcrumb {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}

.page-about .breadcrumb a:hover {
  color: var(--signal-cyan);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--gold-trace);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.6vw, 4.3rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--chalk);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--text-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__shot {
  margin: 28px 0 0;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--shade-teal);
}

.page-about .about-hero__shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.06) brightness(0.92);
}

/* ---------- 锚点数字 ---------- */
.page-about .about-anchors {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sharp);
  overflow: hidden;
}

.page-about .about-anchor {
  padding: clamp(15px, 3.4vw, 26px) clamp(14px, 3vw, 22px);
  background: linear-gradient(180deg, rgba(28, 58, 43, 0.55), rgba(10, 14, 13, 0.92));
}

.page-about .about-anchor__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 7vw, 3.1rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}

.page-about .about-anchor__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-stage {
  padding-top: clamp(34px, 6vw, 64px);
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--gold-trace);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__list a {
  display: inline-block;
  flex: 0 0 auto;
  padding: 7px 15px;
  border: 1px solid var(--line-soft);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a.is-active {
  color: var(--signal-cyan);
  border-color: var(--line-cyan);
  background: rgba(53, 242, 192, 0.08);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  scroll-margin-top: var(--about-sticky);
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(46px, 7vw, 84px);
}

.page-about .about-chapter__head h2 {
  margin: 8px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.6rem, 4.2vw, 2.4rem);
  line-height: 1.28;
  color: var(--chalk);
  max-width: 24ch;
}

.page-about .about-chapter__body > p {
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--text-body);
}

.page-about .about-chapter__body a {
  color: var(--signal-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

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

/* ---------- 转向列表 ---------- */
.page-about .turning {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .turning li {
  position: relative;
  padding-left: 18px;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text-body);
}

.page-about .turning li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-trace);
}

.page-about .turning__k {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--gold-trace);
}

/* ---------- 口径引用 ---------- */
.page-about .caliber-note {
  margin: 26px 0 0;
  padding: 14px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  border-left: 2px solid var(--gold-trace);
  background: linear-gradient(90deg, rgba(201, 162, 39, 0.10), rgba(201, 162, 39, 0) 78%);
}

.page-about .caliber-note p {
  flex: 1 1 260px;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 版本带 ---------- */
.page-about .version-band {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .version-item {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sharp);
  background: linear-gradient(180deg, rgba(16, 36, 26, 0.70), rgba(7, 19, 16, 0.55));
  overflow: hidden;
}

.page-about .version-item > summary {
  list-style: none;
  cursor: pointer;
  padding: 15px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  transition: background 0.22s var(--ease-out);
}

.page-about .version-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .version-item > summary:hover {
  background: rgba(53, 242, 192, 0.05);
}

.page-about .version-item > summary:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: -2px;
}

.page-about .version-item__dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--gold-trace);
  background: var(--void-black);
  transition: background 0.22s var(--ease-out), border-color 0.22s var(--ease-out), box-shadow 0.22s var(--ease-out);
}

.page-about .version-item[open] .version-item__dot {
  background: var(--signal-cyan);
  border-color: var(--signal-cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 192, 0.15);
}

.page-about .version-item__no {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--gold-trace);
}

.page-about .version-item--current .version-item__no {
  color: var(--signal-cyan);
}

.page-about .version-item__year {
  padding: 2px 9px;
  border: 1px solid var(--line-soft);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .version-item__name {
  flex: 1 1 100%;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--chalk);
  line-height: 1.45;
}

.page-about .version-item__body {
  padding: 0 16px 16px 38px;
}

.page-about .version-item__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--text-body);
}

.page-about .version-item__body p + p {
  margin-top: 10px;
}

.page-about .version-item__caliber {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--gold-trace);
}

/* ---------- 图片块 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--shade-teal);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 复核四步 ---------- */
.page-about .review-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .review-step {
  position: relative;
  padding-left: 34px;
}

.page-about .review-step::before {
  content: "";
  position: absolute;
  left: 9.5px;
  top: 24px;
  bottom: -20px;
  width: 1px;
  background: var(--line-gold);
}

.page-about .review-step:last-child::before {
  display: none;
}

.page-about .review-step__no {
  position: absolute;
  left: 0;
  top: 0;
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border: 1px solid var(--gold-trace);
  border-radius: 50%;
  background: var(--void-black);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 600;
  color: var(--gold-trace);
}

.page-about .review-step__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .review-step__text {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--text-body);
}

.page-about .anomaly-note {
  margin: 26px 0 0;
  padding: 14px 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid rgba(255, 122, 47, 0.38);
  border-radius: var(--radius-sharp);
  background: linear-gradient(120deg, rgba(255, 122, 47, 0.10), rgba(255, 122, 47, 0) 72%);
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about .anomaly-note__dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 0.55em;
  border-radius: 50%;
  background: var(--alert-orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.16);
}

/* ---------- 团队分工 ---------- */
.page-about .crew-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .crew-cell {
  padding: clamp(16px, 3vw, 24px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sharp);
  background: linear-gradient(160deg, rgba(28, 58, 43, 0.62), rgba(7, 19, 16, 0.84));
  transition: border-color 0.24s var(--ease-out), transform 0.24s var(--ease-out), box-shadow 0.24s var(--ease-out);
}

.page-about .crew-cell:hover,
.page-about .crew-cell:focus-within {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(7, 19, 16, 0.55);
}

.page-about .crew-cell__role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--signal-cyan);
}

.page-about .crew-cell__num {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 9vw, 3.5rem);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}

.page-about .crew-cell__num small {
  margin-left: 4px;
  font-size: 0.32em;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--mist);
}

.page-about .crew-cell__note {
  margin: 12px 0 0;
  max-width: 48ch;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--text-body);
}

/* ---------- 边界 ---------- */
.page-about .boundary-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .boundary-card {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sharp);
  background: linear-gradient(180deg, rgba(16, 36, 26, 0.60), rgba(10, 14, 13, 0.86));
}

.page-about .boundary-card--yes {
  border-top: 2px solid var(--signal-cyan);
}

.page-about .boundary-card--no {
  border-top: 2px solid var(--alert-orange);
}

.page-about .boundary-card__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.14rem;
  line-height: 1.4;
  color: var(--chalk);
}

.page-about .boundary-card ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .boundary-card li {
  position: relative;
  padding-left: 16px;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--text-body);
}

.page-about .boundary-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--signal-cyan);
}

.page-about .boundary-card--no li::before {
  background: var(--alert-orange);
}

/* ---------- 收口 ---------- */
.page-about .about-cta {
  margin-top: clamp(38px, 6vw, 62px);
  padding: clamp(20px, 4vw, 32px);
  display: grid;
  gap: 18px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-md);
  background:
    radial-gradient(90% 130% at 8% 0%, rgba(53, 242, 192, 0.09), transparent 62%),
    linear-gradient(180deg, rgba(16, 36, 26, 0.82), rgba(7, 19, 16, 0.92));
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text-body);
}

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

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

  .page-about .crew-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .crew-cell--a {
    grid-column: span 7;
  }

  .page-about .crew-cell--b {
    grid-column: span 5;
  }

  .page-about .crew-cell--c {
    grid-column: span 5;
  }

  .page-about .crew-cell--d {
    grid-column: span 7;
  }

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

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: center;
  }

  .page-about .about-hero__shot {
    margin-top: 0;
  }

  .page-about .version-band {
    position: relative;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 20px;
  }

  .page-about .version-band::before {
    content: "";
    position: absolute;
    left: 5px;
    right: 5px;
    top: 23px;
    height: 1px;
    background: var(--line-gold);
  }

  .page-about .version-item {
    border: 0;
    border-radius: 0;
    background: none;
    overflow: visible;
    position: relative;
  }

  .page-about .version-item > summary {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 18px 0 0;
    background: none;
  }

  .page-about .version-item > summary:hover {
    background: none;
  }

  .page-about .version-item > summary:hover .version-item__name {
    color: var(--signal-cyan);
  }

  .page-about .version-item__dot {
    margin-bottom: 6px;
  }

  .page-about .version-item__name {
    flex: 0 1 auto;
    transition: color 0.22s var(--ease-out);
  }

  .page-about .version-item__body {
    padding: 14px 0 0;
    margin-top: 12px;
    border-top: 1px solid var(--line-soft);
  }

  .page-about .review-steps {
    position: relative;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .review-steps::before {
    content: "";
    position: absolute;
    left: 10px;
    right: 10px;
    top: 10px;
    height: 1px;
    z-index: 0;
    background: repeating-linear-gradient(90deg, rgba(201, 162, 39, 0.42) 0 6px, transparent 6px 12px);
  }

  .page-about .review-step {
    padding: 36px 0 0;
    z-index: 1;
  }

  .page-about .review-step::before {
    display: none;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 26px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: var(--about-sticky);
  }

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

  .page-about .about-toc__list a {
    padding: 9px 0 9px 16px;
    border: 0;
    border-left: 1px solid var(--line-soft);
    border-radius: 0;
    background: none;
    white-space: normal;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a.is-active {
    background: none;
    border-left-color: var(--signal-cyan);
    color: var(--signal-cyan);
  }

  .page-about .about-chapter__head {
    max-width: 62ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-cell,
  .page-about .version-item__dot,
  .page-about .version-item__name,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .crew-cell:hover,
  .page-about .crew-cell:focus-within {
    transform: none;
  }
}
<<<END>>>