.page-about {
  --about-rail-w: 92px;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  padding: 34px 0 42px;
  border-bottom: 1px solid var(--line-strong);
  background: linear-gradient(180deg, var(--paper-soft) 0%, var(--paper) 82%);
}

.page-about .about-cover__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: end;
}

.page-about .about-cover__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.2vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-cover__intro {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-muted);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 0;
  margin: 26px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-fact {
  margin: 0 20px 0 0;
  padding-right: 20px;
  border-right: 1px solid var(--line);
}

.page-about .about-fact:last-child {
  margin-right: 0;
  padding-right: 0;
  border-right: 0;
}

.page-about .about-fact__label {
  display: block;
  margin: 0;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.page-about .about-fact__num {
  display: block;
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-900);
  border-bottom: 1px solid var(--amber);
  padding-bottom: 2px;
}

.page-about .about-cover__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--slate-300);
  box-shadow: var(--shadow-2);
}

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

.page-about .about-cover__cap {
  padding: 10px 14px;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding-block: 8px 56px;
}

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

/* ---------- 卷内目录 ---------- */
.page-about .about-rail {
  align-self: start;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate-600);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: var(--paper-card);
  color: var(--text-muted);
  font-family: var(--font-display);
  font-size: 12px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--slate-600);
}

.page-about .about-rail__name {
  display: inline-block;
}

.page-about .about-rail__link.is-active,
.page-about .about-rail__link[aria-current="true"] {
  color: var(--ink-900);
  border-color: var(--amber);
  background: var(--paper-warm);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-top: 30px;
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.page-about .about-flow > .about-sec:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-600);
}

.page-about .about-sec__title {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--moss-500);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3.4vw, 29px);
  line-height: 1.34;
  color: var(--ink-900);
}

.page-about .about-sec__lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-muted);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.page-about .about-origin__body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.95;
  color: var(--text);
}

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

.page-about .about-origin__note {
  margin: 0;
  padding: 16px 18px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  box-shadow: var(--shadow-1);
}

.page-about .about-origin__noteLabel {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ink-700);
}

.page-about .about-origin__noteText {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-muted);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-fig {
  margin: 22px 0 0;
  border: 1px solid var(--line-strong);
  background: var(--slate-300);
  box-shadow: var(--shadow-1);
}

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

.page-about .about-timeline-fig figcaption {
  padding: 9px 14px;
  background: var(--ink-700);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 12px;
  line-height: 1.6;
}

/* ---------- 档案盒卡片 ---------- */
.page-about .about-boxes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-box {
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--moss-500);
  background: var(--paper-card);
  box-shadow: var(--shadow-1);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-box[open] {
  background: var(--paper-warm);
  border-top-color: var(--amber);
}

.page-about .about-box__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 10px;
  align-items: baseline;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-box__year {
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-900);
  border-bottom: 1px solid var(--amber);
  padding-bottom: 1px;
}

.page-about .about-box__title {
  grid-row: 1;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-box__hint {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .about-box__body {
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-muted);
}

.page-about .about-box__body p {
  margin: 0;
}

/* ---------- 编目 ---------- */
.page-about .about-catalog {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 22px;
}

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

.page-about .about-catalog__lead {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-tracks {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-track {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 2px 12px;
  padding: 14px 16px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--slate-600);
}

.page-about .about-track__no {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--clay);
  padding-top: 3px;
}

.page-about .about-track__title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-track__text {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-rulebox {
  margin-top: 18px;
  padding: 18px;
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .about-rulebox h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--amber-soft);
}

.page-about .about-rulebox ul {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rulebox li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.86);
}

.page-about .about-rulebox li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 1px;
  background: var(--amber);
}

.page-about .about-catalog__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--slate-300);
  box-shadow: var(--shadow-1);
}

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

.page-about .about-catalog__figure figcaption {
  padding: 10px 14px;
  background: var(--ink-700);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 12px;
  line-height: 1.6;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-team__card {
  padding: 18px 18px 16px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--slate-600);
  box-shadow: var(--shadow-1);
}

.page-about .about-team__no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--clay);
}

.page-about .about-team__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-team__keys {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__keys li {
  padding: 3px 7px;
  border: 1px solid var(--line-strong);
  background: var(--paper-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .about-cycle {
  margin-top: 20px;
  padding: 18px 20px;
  border: 1px dashed var(--line-strong);
  background: var(--paper-soft);
}

.page-about .about-cycle__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-700);
}

.page-about .about-cycle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--text-muted);
}

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 22px;
}

.page-about .about-coverage__text p {
  margin: 0;
  font-size: 16px;
  line-height: 1.95;
  color: var(--text);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stat {
  padding: 14px 12px;
  background: var(--paper-card);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 4vw, 30px);
  font-weight: 700;
  color: var(--ink-900);
  border-bottom: 1px solid var(--amber);
  padding-bottom: 2px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
}

.page-about .about-dots {
  display: grid;
  grid-template-columns: repeat(14, minmax(0, 1fr));
  gap: 5px;
  max-width: 460px;
}

.page-about .about-dot {
  display: block;
  aspect-ratio: 1 / 1;
  background: var(--slate-300);
  border: 1px solid var(--slate-600);
}

.page-about .about-dot--hl {
  background: var(--amber);
  border-color: var(--clay);
}

/* ---------- 约定 ---------- */
.page-about .about-rules {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-rules li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rules__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--clay);
  padding-top: 3px;
}

.page-about .about-rules p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 40px;
  padding: 28px 22px;
  background: var(--ink-900);
  border-top: 3px solid var(--amber);
}

.page-about .about-cta__title {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--amber);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 3vw, 26px);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-cta__actions .btn--ghost {
  color: var(--paper);
  border-color: var(--line-light-strong);
}

.page-about .about-cta__actions .btn--ghost:hover {
  border-color: var(--amber);
  color: var(--amber-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 780px) {
  .page-about .about-boxes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }

  .page-about .about-box:nth-child(2),
  .page-about .about-box:nth-child(5) {
    margin-top: 28px;
  }

  .page-about .about-box:nth-child(3),
  .page-about .about-box:nth-child(6) {
    margin-top: 10px;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover {
    padding: 56px 0 64px;
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 48px;
  }

  .page-about .about-cover__intro {
    font-size: 17px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 46px;
    padding-block: 26px 72px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--rail-top) + 16px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
    border-bottom: 0;
  }

  .page-about .about-rail__link {
    display: block;
    padding: 11px 0 11px 12px;
    border: 0;
    border-left: 3px solid var(--line);
    background: transparent;
    font-size: 13px;
    line-height: 1.4;
  }

  .page-about .about-rail__no {
    display: block;
    font-size: 10px;
    letter-spacing: 0.1em;
  }

  .page-about .about-rail__link:hover {
    border-left-color: var(--moss-500);
    color: var(--ink-900);
  }

  .page-about .about-rail__link.is-active,
  .page-about .about-rail__link[aria-current="true"] {
    border-left-width: 6px;
    border-left-color: var(--amber);
    background: var(--paper-card);
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-catalog {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 24px 40px;
    align-items: start;
  }

  .page-about .about-coverage__text {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-stats {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-dots {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-cta {
    padding: 40px 34px;
  }

  .page-about .about-rules li {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
    padding: 18px 0;
  }
}
<<<END>>>