.page-about {
  --about-deep: #0B211C;
  --about-band-pad: 44px;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 20px 0 0;
  background: var(--paper);
}

.page-about .about-crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-crumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--gold);
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-2);
}

.page-about .about-kicker::after {
  content: "";
  width: 64px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.8rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--ink);
  max-width: 16em;
}

.page-about .about-hero__band {
  position: relative;
  margin-top: 34px;
  background: linear-gradient(158deg, var(--ink-2) 0%, var(--ink) 58%, var(--about-deep) 100%);
  clip-path: polygon(0 22px, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-hero__band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(200, 169, 106, 0.075) 0 1px, transparent 1px 56px);
  pointer-events: none;
}

.page-about .about-hero__band .shell {
  position: relative;
  z-index: 1;
  padding-top: var(--about-band-pad);
  padding-bottom: 48px;
}

.page-about .about-hero__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}

.page-about .about-hero__text {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(251, 248, 242, 0.86);
  max-width: 33em;
}

.page-about .about-hero__text .idx {
  color: var(--gold-hi);
}

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

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

.page-about .about-hero__figure .figure__frame {
  border-color: rgba(200, 169, 106, 0.4);
}

.page-about .about-hero__figure .figure__cap {
  color: rgba(230, 211, 163, 0.8);
}

/* ---------- 页内目录 ---------- */
.page-about .about-toc {
  background: var(--paper-hi);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-toc__list {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 10px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--ink);
  border-color: var(--line);
  background: var(--paper);
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-section {
  padding: 52px 0;
}

.page-about .about-section--last {
  padding-bottom: 72px;
}

.page-about .about-section__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .sec-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .sec-no::after {
  content: "";
  display: block;
  margin-top: 10px;
  width: 42px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.8vw, 2.15rem);
  line-height: 1.32;
  letter-spacing: 0.015em;
  color: var(--ink);
  max-width: 20em;
}

.page-about .about-lead {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 33em;
}

.page-about .about-body {
  margin: 20px 0 0;
  max-width: 34em;
}

.page-about .about-body p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.8;
}

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

.page-about .about-quote {
  margin: 26px 0 0;
  padding: 2px 0 2px 20px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.72;
  color: var(--ink-2);
  max-width: 26em;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 30px;
}

.page-about .tl__item {
  position: relative;
  margin-bottom: 12px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  bottom: -12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(200, 169, 106, 0.28) 100%);
}

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

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: -34px;
  top: 19px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--gold);
  background: var(--paper);
  transform: rotate(45deg);
}

.page-about .tl__card {
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  box-shadow: 0 1px 0 rgba(27, 31, 29, 0.03), 0 10px 26px -22px rgba(14, 42, 36, 0.6);
  overflow: hidden;
  transition: border-color 180ms var(--ease);
}

.page-about .tl__card:hover {
  border-color: var(--line);
}

.page-about .tl__item:nth-child(1) .tl__card { background: #FBF8F2; }
.page-about .tl__item:nth-child(2) .tl__card { background: #F7F3EB; }
.page-about .tl__item:nth-child(3) .tl__card { background: #F3EEE5; }
.page-about .tl__item:nth-child(4) .tl__card { background: #EFE9DF; }
.page-about .tl__item:nth-child(5) .tl__card { background: #EAE4D9; }
.page-about .tl__item:nth-child(6) .tl__card { background: #E4DDD0; }
.page-about .tl__item:nth-child(7) .tl__card {
  background: var(--ink);
  border-color: rgba(200, 169, 106, 0.5);
  color: var(--paper-hi);
}

.page-about .tl__btn {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px 14px;
  padding: 15px 16px 15px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__btn:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: -2px;
}

.page-about .tl__seal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--gold-hi);
  border: 1px solid var(--gold);
  padding: 3px 8px;
  border-radius: 1px;
}

.page-about .tl__text {
  display: block;
  min-width: 0;
}

.page-about .tl__name {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl__sum {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .tl__item:nth-child(7) .tl__name { color: var(--paper-hi); }
.page-about .tl__item:nth-child(7) .tl__sum { color: rgba(230, 211, 163, 0.78); }
.page-about .tl__item:nth-child(7) .tl__seal {
  background: transparent;
  color: var(--gold-hi);
  border-color: var(--gold);
}

.page-about .tl__mark {
  position: relative;
  width: 12px;
  height: 12px;
  flex: none;
}

.page-about .tl__mark::before,
.page-about .tl__mark::after {
  content: "";
  position: absolute;
  background: var(--gold);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.page-about .tl__mark::before {
  left: 0;
  top: 5.5px;
  width: 12px;
  height: 1px;
}

.page-about .tl__mark::after {
  left: 5.5px;
  top: 0;
  width: 1px;
  height: 12px;
}

.page-about .tl__card[open] .tl__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .tl__panel {
  padding: 0 18px 18px 16px;
  max-width: 36em;
}

.page-about .tl__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .tl__item:nth-child(7) .tl__panel p {
  color: rgba(251, 248, 242, 0.82);
}

/* ---------- 宽幅图版 ---------- */
.page-about .about-section--figure {
  padding: 12px 0 44px;
}

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

.page-about .about-wide-figure .figure__cap {
  max-width: 34em;
}

/* ---------- 编号拆解 ---------- */
.page-about .code-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  margin: 26px 0 0;
  padding: 20px 18px;
  background: var(--paper-hi);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: 2px;
}

.page-about .code-bar__seg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px 12px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  min-width: 92px;
}

.page-about .code-bar__val {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-about .code-bar__cap {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .code-bar__dash {
  align-self: center;
  width: 18px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-tablewrap {
  margin: 28px 0 0;
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  background: var(--paper-hi);
}

.page-about .about-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-tablewrap .table {
  min-width: 520px;
  margin: 0;
}

/* ---------- 编辑与校对 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 22px;
}

.page-about .about-split__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.8;
  max-width: 34em;
}

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

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

/* ---------- 规模数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--ink-2);
}

.page-about .about-stats__cell {
  background: var(--paper-hi);
  padding: 18px 14px;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 协作通道 ---------- */
.page-about .about-section--last {
  background: linear-gradient(180deg, var(--paper) 0%, #E9E3D8 100%);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 28px 0 0;
}

.page-about .about-linkcard {
  display: block;
  padding: 16px 16px 18px;
  background: var(--paper-hi);
  border: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  border-radius: 2px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 180ms var(--ease), background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-linkcard:hover,
.page-about .about-linkcard:focus-visible {
  border-left-color: var(--gold);
  background: #FFFDF8;
}

.page-about .about-linkcard strong {
  display: block;
  margin: 8px 0 6px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .about-linkcard span:last-child {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-contact {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 36em;
}

.page-about .about-contact a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-about .about-contact a:hover {
  color: var(--crimson);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-section {
    padding: 64px 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 26px;
  }

  .page-about .about-hero__band {
    margin-top: 44px;
    clip-path: polygon(0 34px, 100% 0, 100% 100%, 0 100%);
  }

  .page-about .about-hero__band .shell {
    padding-top: 60px;
    padding-bottom: 64px;
  }

  .page-about .about-hero__row {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    align-items: center;
  }

  .page-about .about-hero__lead {
    grid-column: 1 / span 7;
  }

  .page-about .about-hero__figure {
    grid-column: 9 / span 4;
  }

  .page-about .about-section {
    padding: 84px 0;
  }

  .page-about .about-section__inner {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .sec-no {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.32em;
    align-self: start;
    padding-top: 4px;
  }

  .page-about .sec-no::after {
    margin-top: 14px;
    width: 1px;
    height: 72px;
  }

  .page-about .about-main {
    max-width: 46em;
  }

  .page-about .about-section--figure {
    padding: 8px 0 56px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-section--last {
    padding-bottom: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-linkcard,
  .page-about .about-toc__list a,
  .page-about .tl__mark::before,
  .page-about .tl__mark::after,
  .page-about .tl__card,
  .page-about .about-crumbs a {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>
</main>