.page-about {
  --about-rail-w: 168px;
  --about-gap: clamp(22px, 3.4vw, 44px);
  --about-cell: #0F1A18;
  color: var(--bs-paper);
  padding-bottom: clamp(72px, 12vw, 160px);
}

.page-about .about-crumb {
  padding-top: clamp(20px, 5vw, 48px);
  padding-bottom: clamp(16px, 3vw, 28px);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.4vw, 82px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin: 14px 0 20px;
  max-width: 15ch;
  color: var(--bs-paper);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(243, 239, 228, 0.8);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--bs-hair-soft);
  border: 1px solid var(--bs-hair);
  border-radius: var(--bs-radius-md);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--bs-green);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-stat__num {
  font-size: clamp(24px, 3.6vw, 30px);
  line-height: 1;
  color: var(--bs-lime);
}

.page-about .about-stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(243, 239, 228, 0.66);
}

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

.page-about .bs-media__inner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--bs-radius-md);
}

/* ---------- 主体栅格 ---------- */

.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(24px, 4vw, 48px);
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  color: var(--bs-moss);
}

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

.page-about .bs-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .bs-rail__link {
  display: block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--bs-radius-pill);
  border: 1px solid var(--bs-hair);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--bs-moss);
  text-decoration: none;
  background: rgba(28, 43, 38, 0.5);
  transition: color var(--bs-dur) var(--bs-ease), border-color var(--bs-dur) var(--bs-ease),
    background-color var(--bs-dur) var(--bs-ease);
}

.page-about .bs-rail__link:hover,
.page-about .bs-rail__link:focus-visible {
  color: var(--bs-lime);
  border-color: var(--bs-lime-hair);
}

.page-about .bs-rail__link.is-active {
  color: var(--bs-ink);
  background: var(--bs-lime);
  border-color: var(--bs-lime);
}

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

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding-block: clamp(34px, 5.6vw, 68px);
  border-top: 1px solid var(--bs-hair);
}

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

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-chapter__num {
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--bs-lime);
  flex: none;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--bs-paper);
}

.page-about .about-chapter__body > p {
  max-width: 64ch;
  margin: 0 0 18px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(243, 239, 228, 0.84);
}

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

.page-about .about-note {
  border-left: 2px solid var(--bs-amber);
  padding: 6px 0 6px 14px;
  max-width: 48ch;
  color: var(--bs-moss);
  line-height: 1.75;
}

/* ---------- 数据条 ---------- */

.page-about .about-strip {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  background: var(--bs-hair-soft);
  border: 1px solid var(--bs-hair);
  border-radius: var(--bs-radius-md);
  overflow: hidden;
}

.page-about .about-strip__cell {
  background: var(--about-cell);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-strip__num {
  font-size: clamp(22px, 3.2vw, 27px);
  line-height: 1;
  color: var(--bs-amber);
}

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

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-figure--tall {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 版本时间带 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 34px) 28px;
  border-left: 1px solid var(--bs-hair);
}

.page-about .about-timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline__ring {
  position: absolute;
  left: -6px;
  top: 10px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--bs-amber);
  background: var(--bs-ink);
  transition: background-color var(--bs-dur) var(--bs-ease), transform var(--bs-dur) var(--bs-ease);
}

.page-about .about-timeline__item:hover .about-timeline__ring {
  background: var(--bs-amber);
}

.page-about .about-timeline__year {
  display: block;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: 0.05em;
  color: var(--bs-paper);
}

.page-about .about-timeline__title {
  margin: 10px 0 6px;
  font-family: var(--bs-font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 18px);
  letter-spacing: 0;
  color: var(--bs-paper);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--bs-moss);
}

/* ---------- 栏目索引 ---------- */

.page-about .about-subhead {
  margin: clamp(36px, 5vw, 56px) 0 6px;
  font-family: var(--bs-font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 20px);
  letter-spacing: 0;
  color: var(--bs-paper);
}

.page-about .about-index-lead {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--bs-moss);
}

.page-about .about-details {
  border: 1px solid var(--bs-hair);
  border-radius: var(--bs-radius-sm);
  background: rgba(28, 43, 38, 0.42);
  margin-bottom: 8px;
  overflow: hidden;
}

.page-about .about-details__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  font-size: clamp(15px, 1.7vw, 16px);
  color: var(--bs-paper);
  transition: color var(--bs-dur) var(--bs-ease);
}

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

.page-about .about-details__summary:hover {
  color: var(--bs-lime);
}

.page-about .about-details__hint {
  font-family: var(--bs-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--bs-moss);
  flex: none;
}

.page-about .about-details__body {
  padding: 0 18px 16px;
  border-top: 1px solid var(--bs-hair-soft);
  margin-top: 0;
}

.page-about .about-details__body p {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--bs-moss);
}

.page-about .about-link {
  color: var(--bs-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--bs-lime-hair);
  padding-bottom: 1px;
  font-size: 13.5px;
  letter-spacing: 0.04em;
}

.page-about .about-link:hover {
  border-bottom-color: var(--bs-lime);
}

.page-about .about-details[open] > .about-details__summary {
  color: var(--bs-lime);
}

/* ---------- 收尾 ---------- */

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px) !important;
}

/* ---------- 断点 ---------- */

@media (min-width: 768px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 68px);
    align-items: start;
  }

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

  .page-about .bs-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0;
  }

  .page-about .bs-rail__link {
    border-color: transparent;
    background: transparent;
    padding: 9px 0 9px 14px;
    border-left: 2px solid var(--bs-hair);
    border-radius: 0;
    white-space: normal;
  }

  .page-about .bs-rail__link.is-active {
    background: transparent;
    color: var(--bs-lime);
    border-left-color: var(--bs-lime);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }

  .page-about .about-chapter__body > p {
    font-size: 17px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-timeline__item {
    padding-left: 34px;
  }

  .page-about .about-figure--tall .bs-media__inner {
    max-width: 720px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .bs-rail__link,
  .page-about .about-timeline__ring,
  .page-about .about-details__summary {
    transition: none;
  }
}
<<<END>>>