.page-about {
  --about-rail: 108px;
  position: relative;
  padding-top: 92px;
  background:
    radial-gradient(58% 36% at 82% 0%, rgba(53, 230, 210, .11), transparent 72%),
    radial-gradient(42% 28% at 4% 24%, rgba(255, 138, 61, .08), transparent 70%);
  background-repeat: no-repeat;
  overflow-x: clip;
}

.page-about .crumb {
  padding-top: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 34px;
  padding-top: 18px;
  padding-bottom: 56px;
}

.page-about .eyebrow {
  letter-spacing: .14em;
  text-transform: uppercase;
}

.page-about h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 7.2vw, 58px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .lede {
  margin-top: 18px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .hero-badge {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(11, 32, 54, .72);
  border: 1px solid var(--line-soft);
  backdrop-filter: blur(14px);
}

.page-about .hero-badge--accent {
  background: linear-gradient(150deg, rgba(53, 230, 210, .18), rgba(11, 32, 54, .9));
  border-color: var(--line-cyan);
}

.page-about .hero-badge__num {
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--cyan-400);
}

.page-about .hero-badge--accent .hero-badge__num {
  color: var(--cyan-200);
  font-size: 34px;
}

.page-about .hero-badge__label {
  font-size: 13px;
  color: var(--slate-400);
}

/* ---------- 通用区块 ---------- */
.page-about .section {
  padding-block: 64px;
}

.page-about .about-head {
  max-width: 36em;
  margin-bottom: 36px;
}

.page-about h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.8vw, 38px);
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about h3 {
  margin: 12px 0 8px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 18px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about p {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .origin-copy > p,
.page-about .watch-copy > p,
.page-about .partners-copy > p {
  max-width: 34em;
}

/* ---------- 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: 32px;
}

.page-about .pullquote {
  position: relative;
  margin: 26px 0 0;
  padding: 12px 16px 12px 18px;
  border-left: 3px solid var(--cyan-400);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  background: rgba(53, 230, 210, .06);
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .pullquote__no {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan-400);
  font-family: var(--font-mono);
}

.page-about .origin-file {
  align-self: start;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(18, 48, 76, .92), rgba(11, 32, 54, .92));
  border: 1px solid var(--line-cyan);
}

.page-about .origin-file__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan-400);
}

.page-about .origin-file__list {
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .origin-file__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .origin-file__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .origin-file__row dt {
  font-size: 13px;
  color: var(--slate-400);
}

.page-about .origin-file__row dd {
  margin: 0;
  font-size: 20px;
  color: var(--cyan-200);
}

.page-about .origin-file__note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-400);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-shell {
  position: relative;
}

.page-about .timeline-texture {
  position: absolute;
  inset: -24px -8px auto;
  height: 220px;
  z-index: 0;
  pointer-events: none;
  opacity: .3;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 92%);
  mask-image: linear-gradient(180deg, #000, transparent 92%);
}

.page-about .timeline-texture img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  display: block;
}

.page-about .year-rail,
.page-about .era-list {
  position: relative;
  z-index: 1;
}

.page-about .year-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 16px;
  scrollbar-width: none;
}

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

.page-about .year-rail__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-soft);
  background: rgba(11, 32, 54, .8);
  font-size: 13px;
  color: var(--slate-400);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .year-rail__item:hover,
.page-about .year-rail__item:focus-visible {
  color: var(--cyan-200);
  border-color: var(--line-cyan);
}

.page-about .year-rail__item:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .year-rail__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(53, 230, 210, .16);
}

.page-about .era-list {
  display: grid;
  gap: 18px;
  margin-top: 8px;
}

.page-about .era-card {
  padding: 22px 22px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(18, 48, 76, .94), rgba(11, 32, 54, .94));
  border: 1px solid var(--line-soft);
  scroll-margin-top: 120px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .era-card:hover {
  transform: translateY(-3px);
}

.page-about .era-card:target {
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 1px var(--line-cyan);
}

.page-about .era-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .era-card__year {
  font-size: 26px;
  letter-spacing: .02em;
  color: var(--cyan-400);
}

.page-about .era-card__path {
  width: 108px;
  height: 22px;
  color: var(--cyan-200);
  opacity: .6;
}

.page-about .era-card p {
  font-size: 15px;
}

.page-about .era-card .tag {
  display: inline-block;
  margin-top: 16px;
}

/* ---------- 值守 ---------- */
.page-about .about-watch {
  background: linear-gradient(180deg, rgba(11, 32, 54, .5), transparent 70%);
}

.page-about .watch-grid {
  display: grid;
  gap: 32px;
}

.page-about .media__frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background:
    repeating-linear-gradient(135deg, rgba(53, 230, 210, .07) 0 2px, transparent 2px 12px),
    var(--ink-800);
}

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

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

.page-about .media--wide .media__img {
  aspect-ratio: 16 / 9;
}

.page-about .media--square .media__img {
  aspect-ratio: 1 / 1;
}

.page-about .media__glow {
  position: absolute;
  inset: auto -20% -30% auto;
  width: 60%;
  height: 60%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 230, 210, .3), transparent 70%);
  pointer-events: none;
}

.page-about .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-400);
}

.page-about .watch-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .watch-points li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-xs);
  background: rgba(18, 48, 76, .7);
  border-left: 2px solid var(--orange);
  font-size: 14px;
  color: var(--paper);
}

.page-about .watch-points .mono {
  min-width: 92px;
  font-size: 13px;
  color: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .crew-counts {
  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-md);
  overflow: hidden;
}

.page-about .count-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px 22px;
  background: var(--ink-800);
}

.page-about .count-num {
  font-size: clamp(32px, 8vw, 56px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--cyan-400);
}

.page-about .count-item:nth-child(1) .count-num {
  color: var(--cyan-200);
}

.page-about .count-label {
  font-size: 13px;
  color: var(--slate-400);
}

.page-about .crew-notes {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .crew-notes p {
  padding-left: 14px;
  border-left: 2px solid var(--line-cyan);
  font-size: 15px;
}

.page-about .crew-notes strong {
  color: var(--paper);
  font-weight: 500;
}

/* ---------- 做法 ---------- */
.page-about .rules-layout {
  display: grid;
  gap: 28px;
}

.page-about .rules-list {
  display: grid;
  gap: 14px;
}

.page-about .rule-card {
  position: relative;
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  background: rgba(11, 32, 54, .76);
  border: 1px solid var(--line-soft);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .rule-card:hover {
  border-color: var(--line-cyan);
  background: rgba(18, 48, 76, .86);
}

.page-about .rule-card__no {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan-400);
}

.page-about .rule-card h3 {
  margin-top: 8px;
}

.page-about .rule-card p {
  font-size: 15px;
}

.page-about .rules-figure {
  margin: 0;
}

/* ---------- 合作 ---------- */
.page-about .partners-grid {
  display: grid;
  gap: 28px;
}

.page-about .partners-card {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  align-self: start;
}

.page-about .partners-card__row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 20px;
  background: var(--ink-800);
}

.page-about .partners-card__num {
  font-size: 26px;
  line-height: 1;
  color: var(--cyan-200);
}

.page-about .partners-card__label {
  font-size: 13px;
  color: var(--slate-400);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding-bottom: 88px;
}

.page-about .about-closing {
  display: grid;
  gap: 24px;
  padding: 28px 24px 32px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(70% 120% at 100% 0%, rgba(255, 138, 61, .16), transparent 62%),
    linear-gradient(150deg, rgba(18, 48, 76, .96), rgba(6, 20, 34, .96));
  border: 1px solid var(--line-cyan);
}

.page-about .about-closing__mark {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-closing__num {
  font-size: clamp(48px, 13vw, 84px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .about-closing__num i {
  font-style: normal;
  font-size: .42em;
  margin-left: 2px;
  color: var(--slate-400);
}

.page-about .about-closing__cap {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--slate-400);
}

.page-about .about-closing__body h2 {
  margin-top: 0;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

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

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

@media (min-width: 900px) {
  .page-about {
    padding-top: 104px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    padding-bottom: 84px;
  }

  .page-about .about-hero__aside {
    margin-top: 54px;
  }

  .page-about .section {
    padding-block: 88px;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
  }

  .page-about .origin-file {
    margin-top: 56px;
  }

  .page-about .timeline-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .year-rail {
    flex-direction: column;
    gap: 4px;
    padding-bottom: 0;
    overflow: visible;
    position: sticky;
    top: 120px;
  }

  .page-about .year-rail__item {
    justify-content: flex-start;
    background: transparent;
    border-color: transparent;
    padding: 10px 0 10px 4px;
    font-size: 15px;
  }

  .page-about .year-rail__item:hover {
    background: rgba(53, 230, 210, .08);
    border-color: transparent;
    padding-left: 10px;
  }

  .page-about .era-list {
    margin-top: 0;
    gap: 22px;
  }

  .page-about .era-card {
    padding: 28px 30px 30px;
  }

  .page-about .watch-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .rules-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .rules-figure {
    position: sticky;
    top: 120px;
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-closing {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    gap: 44px;
    align-items: center;
    padding: 40px 44px 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .era-card,
  .page-about .rule-card,
  .page-about .year-rail__item {
    transition: none;
  }

  .page-about .era-card:hover {
    transform: none;
  }
}
<<<END>>>