.page-about {
  --about-rail: 132px;
  --about-ink-soft: rgba(15, 17, 21, .72);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

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

.page-about .crumb {
  margin-bottom: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 30px;
  padding-bottom: 44px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__copy h1 {
  margin: 10px 0 18px;
  letter-spacing: -.01em;
}

.page-about .about-hero__copy .lead {
  max-width: 38em;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 18px 20px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-facts__cell {
  border-left: 1px solid var(--rule);
  padding-left: 12px;
}

.page-about .about-facts__cell:first-child {
  border-left: 0;
  padding-left: 0;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-facts dd span {
  display: block;
  margin-top: 5px;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 12px;
  line-height: 1.4;
  color: var(--muted);
}

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

.page-about .media-frame {
  border: 1px solid var(--hair);
  border-radius: 2px;
  background: var(--paper-2);
}

.page-about .media-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .media-frame__note {
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--rule);
  padding: 10px 12px;
  background: var(--paper);
}

.page-about .about-hero__fig img {
  aspect-ratio: 14 / 9;
}

.page-about .about-roles__fig,
.page-about .about-timeline__fig {
  margin: 26px 0 0;
}

.page-about .about-roles__fig img {
  aspect-ratio: 10 / 7;
}

.page-about .about-timeline__fig img {
  aspect-ratio: 5 / 3;
}

.page-about .about-timeline__fig {
  margin-bottom: 30px;
}

/* ---------- 主体：左刻度 + 右正文 ---------- */
.page-about .about-body {
  padding-bottom: 60px;
}

.page-about .about-cols {
  display: grid;
  gap: 24px;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: 110px;
  padding: 40px 0 34px;
  border-top: 1px solid var(--rule);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 20px;
}

.page-about .about-sec__head .sec-num {
  flex: 0 0 auto;
  font-size: 34px;
  line-height: 1;
  color: var(--night);
  letter-spacing: -.02em;
}

.page-about .about-sec__head h2 {
  margin: 0;
  max-width: 22em;
}

.page-about .about-sec__body .prose {
  max-width: 640px;
}

.page-about .about-sec__body p {
  margin: 0 0 1.15em;
}

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

/* ---------- 角色标签页 ---------- */
.page-about .about-roles__intro {
  margin-bottom: 22px;
}

.page-about .tabs {
  margin-bottom: 4px;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 14px;
}

.page-about .tabs__tab {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  padding: 11px 15px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  transition: background var(--t-fast) linear, color var(--t-fast) linear,
              border-color var(--t-fast) linear, transform var(--t-fast) linear;
}

.page-about .tabs__tab:hover {
  border-color: var(--ink);
  transform: translateY(-2px);
}

.page-about .tabs__tab[aria-selected="true"] {
  background: var(--night);
  border-color: var(--night);
  color: var(--paper);
}

.page-about .tabs__tab:focus-visible {
  outline: 3px solid var(--turf);
  outline-offset: 2px;
}

.page-about .tabs__panel {
  padding-top: 24px;
  max-width: 640px;
}

.page-about .tabs__panel p {
  margin: 0 0 1.1em;
}

.page-about .about-panel__lead {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

/* ---------- 轮次刻度条 ---------- */
.page-about .round-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin: 26px 0 10px;
  max-width: 900px;
}

.page-about .round-strip__cell {
  display: block;
  padding: 9px 2px;
  text-align: center;
  border: 1px solid var(--hair);
  border-radius: 2px;
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .02em;
  color: var(--muted);
}

.page-about .round-strip__cell--peak {
  background: var(--ref-yellow);
  border-color: var(--ink);
  color: var(--ink);
  font-weight: 700;
}

.page-about .round-strip__note {
  max-width: 900px;
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--ref-yellow);
}

/* ---------- 内容标准 ---------- */
.page-about .about-standards {
  margin-top: 4px;
}

.page-about .about-standard {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 2px;
  box-shadow: 5px 5px 0 var(--paper-2);
  padding: 22px 20px 24px;
}

.page-about .about-standard__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--night-bright);
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-standard h3 {
  margin: 0 0 12px;
  font-size: 19px;
}

.page-about .about-standard p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  max-width: 700px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: var(--rule);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 30px 34px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--night);
  transition: background var(--t-fast) linear, transform var(--t-fast) linear;
}

.page-about .tl__item:last-child::before {
  background: var(--turf);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--turf);
  transform: translateY(-2px);
}

.page-about .tl__stamp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  margin: 0 0 6px;
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-size: 19px;
}

.page-about .tl__more {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 34em;
  transition: color var(--t-fast) linear;
}

.page-about .tl__item:hover .tl__more,
.page-about .tl__item:focus-within .tl__more {
  color: var(--ink);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  margin-top: 46px;
  padding: 34px 22px 30px;
  border-radius: 2px;
  background: var(--turf-deep);
  color: var(--paper);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-cta__lead {
  margin: 0 0 22px;
  color: var(--on-dark);
  font-size: 16px;
}

.page-about .about-cta__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-cta__item {
  display: block;
  padding: 16px 16px 18px;
  border: 1px solid rgba(247, 248, 246, .34);
  border-radius: 2px;
  color: var(--paper);
  text-decoration: none;
  transition: background var(--t-fast) linear, border-color var(--t-fast) linear,
              transform var(--t-fast) linear;
}

.page-about .about-cta__item:hover {
  background: rgba(31, 191, 107, .18);
  border-color: var(--turf);
  transform: translateY(-2px);
}

.page-about .about-cta__item:focus-visible {
  outline: 3px solid var(--ref-yellow);
  outline-offset: 2px;
}

.page-about .about-cta__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ref-yellow);
  margin-bottom: 8px;
}

.page-about .about-cta__label {
  display: block;
  font-size: 16px;
  line-height: 1.6;
}

/* ---------- 桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding-top: 40px;
    padding-bottom: 56px;
  }

  .page-about .round-strip {
    grid-template-columns: repeat(10, minmax(0, 1fr));
  }

  .page-about .about-cta {
    padding: 42px 34px 38px;
  }

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

  .page-about .about-standard {
    padding: 26px 24px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: end;
    gap: 52px;
  }

  .page-about .about-hero__copy h1 {
    font-size: 46px;
  }

  .page-about .about-sec {
    padding: 52px 0 46px;
  }

  .page-about .about-sec__head .sec-num {
    font-size: 42px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-cols {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    display: block;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 104px;
    border-left: 1px solid var(--rule);
  }

  .page-about .about-rail__title {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .1em;
    color: var(--muted);
    margin: 0 0 10px;
    padding-left: 18px;
  }

  .page-about .about-rail__link {
    display: block;
    position: relative;
    padding: 9px 0 9px 18px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .02em;
    color: var(--muted);
    text-decoration: none;
    transition: color var(--t-fast) linear;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 50%;
    margin-top: -3.5px;
    width: 7px;
    height: 7px;
    background: var(--paper-2);
    border: 1px solid var(--rule);
    border-radius: 1px;
    transition: background var(--t-fast) linear, border-color var(--t-fast) linear;
  }

  .page-about .about-rail__link:hover {
    color: var(--ink);
  }

  .page-about .about-rail__link:hover::before {
    background: var(--turf);
    border-color: var(--ink);
  }

  .page-about .about-rail__link:focus-visible {
    outline: 3px solid var(--turf);
    outline-offset: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tabs__tab,
  .page-about .about-cta__item,
  .page-about .tl__item::before,
  .page-about .tl__more,
  .page-about .about-rail__link,
  .page-about .about-rail__link::before {
    transition: none;
  }

  .page-about .tabs__tab:hover,
  .page-about .about-cta__item:hover,
  .page-about .tl__item:hover::before,
  .page-about .tl__item:focus-within::before {
    transform: none;
  }
}
<<<END>>>