.page-about {
  --about-rule: var(--grid-line);
  --about-accent: var(--violet);
  --about-num: var(--amber);
  position: relative;
  padding-bottom: 88px;
}

.page-about [id] {
  scroll-margin-top: 104px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 22px 0 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 18px 0 40px;
  border-bottom: 1px solid var(--about-rule);
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 96px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--about-accent);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.14;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero .lede {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-baseline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin: 34px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-baseline-cell dt {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-baseline-cell dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  font-family: var(--serif);
  line-height: 1;
  color: var(--about-num);
}

.page-about .about-big {
  font-size: clamp(38px, 10vw, 60px);
  font-weight: 700;
  letter-spacing: -.03em;
}

.page-about .about-unit {
  margin-left: 6px;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--paper);
  opacity: .72;
}

/* ---------- 通用章节微调 ---------- */
.page-about .section-title {
  max-width: 24ch;
}

.page-about .about-subhead {
  margin: 0 0 12px;
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-subhead::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--about-accent);
}

/* ---------- 时间线 ---------- */
.page-about .about-band {
  margin: 32px 0 36px;
}

.page-about .about-roadmap {
  position: relative;
  margin-top: 8px;
  padding-left: 26px;
  border-left: 1px solid var(--about-rule);
}

.page-about .about-stage {
  position: relative;
  padding: 18px 0 20px;
  border-bottom: 1px dashed var(--about-rule);
}

.page-about .about-stage:last-child {
  border-bottom: none;
  padding-bottom: 4px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--about-num);
  box-shadow: 0 0 0 4px rgba(242, 178, 76, .13);
}

.page-about .about-stage > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  cursor: pointer;
  list-style: none;
  outline-offset: 4px;
}

.page-about .about-stage > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-stage > summary::marker {
  content: "";
}

.page-about .about-stage-time {
  font-family: var(--serif);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--about-accent);
  white-space: nowrap;
}

.page-about .about-stage-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-stage[open] .about-stage-title {
  color: var(--cyan);
}

.page-about .about-stage-body {
  margin: 12px 0 0;
  padding-left: 2px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 66ch;
}

/* ---------- 九类划分 ---------- */
.page-about .about-tax-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 28px;
}

.page-about .about-cat-tablist {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-rule);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-cat-tablist .tab {
  flex: 0 0 auto;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--about-rule);
  color: var(--muted);
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: .02em;
  white-space: nowrap;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-cat-tablist .tab:hover,
.page-about .about-cat-tablist .tab:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .about-cat-tablist .tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 600;
}

.page-about .about-cat-panel {
  padding: 22px 0 0;
}

.page-about .about-cat-panel[hidden] {
  display: none;
}

.page-about .about-cat-panel:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 6px;
}

.page-about .about-cat-lead {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  max-width: 58ch;
}

.page-about .about-cat-note {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--about-num);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 58ch;
}

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

.page-about .about-keep-nine {
  margin-top: 38px;
  padding: 24px 22px;
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--about-accent);
  background: var(--ink-2);
  box-shadow: var(--shadow-press);
}

.page-about .about-keep-nine p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  max-width: 68ch;
}

/* ---------- 数值口径表 ---------- */
.page-about .about-table-wrap {
  margin-top: 28px;
  overflow-x: auto;
  border: 1px solid var(--about-rule);
  background: var(--ink-2);
  box-shadow: var(--shadow-press);
}

.page-about .about-metrics-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.page-about .about-metrics-table caption {
  padding: 14px 18px;
  text-align: left;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--about-accent);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-metrics-table th,
.page-about .about-metrics-table td {
  padding: 15px 18px;
  text-align: left;
  vertical-align: top;
  font-size: 15px;
  line-height: 1.75;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-metrics-table tbody tr:last-child th,
.page-about .about-metrics-table tbody tr:last-child td {
  border-bottom: none;
}

.page-about .about-metrics-table thead th {
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  background: rgba(122, 92, 255, .07);
  white-space: nowrap;
}

.page-about .about-metrics-table tbody th[scope="row"] {
  color: var(--paper);
  font-weight: 600;
  white-space: nowrap;
}

.page-about .about-metrics-table td.num {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--about-num);
  text-align: right;
  white-space: nowrap;
}

.page-about .about-metrics-table td:last-child {
  color: var(--muted);
  font-size: 14.5px;
  max-width: 42ch;
}

.page-about .about-metrics-foot {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--about-rule);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 70ch;
}

/* ---------- 运营分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-team-card {
  display: flex;
  flex-direction: column;
  padding: 20px 18px 22px;
}

.page-about .about-team-card .ticket-tag {
  align-self: flex-start;
}

.page-about .about-team-num {
  display: block;
  margin: 16px 0 2px;
  font-family: var(--serif);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--about-num);
}

.page-about .about-team-card h3 {
  margin: 8px 0 10px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-inspect-figure {
  margin: 32px 0 0;
}

.page-about .about-inspect {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-inspect p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 72ch;
}

/* ---------- 备案与署名 ---------- */
.page-about .about-imprint {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 22px;
  padding-top: 24px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-imprint-label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--about-accent);
}

.page-about .about-imprint-value {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-imprint-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-imprint-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-imprint-links li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  font-size: 14px;
}

.page-about .about-imprint-links a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--about-rule);
  padding-bottom: 1px;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-imprint-links a:hover,
.page-about .about-imprint-links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-imprint-links span {
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- 侧边浮动目录 ---------- */
.page-about .about-toc {
  display: none;
}

.page-about .about-toc .panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-toc-toggle {
  background: transparent;
  border: 1px solid var(--about-rule);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .1em;
  padding: 4px 9px;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-toc-toggle:hover,
.page-about .about-toc-toggle:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-toc[data-collapsed="true"] .panel-body {
  display: none;
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc-list a {
  display: block;
  padding: 7px 10px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(0, 224, 208, .06);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 26px 0 48px;
  }

  .page-about .about-baseline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

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

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

  .page-about .about-roadmap {
    padding-left: 34px;
  }

  .page-about .about-stage::before {
    left: -39px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-tax-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-tax-figure {
    position: sticky;
    top: 104px;
  }

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

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

  .page-about .about-hero h1 {
    max-width: 22ch;
  }

  .page-about .about-band {
    margin: 36px 0 44px;
  }

  .page-about .about-roadmap {
    padding-left: 40px;
  }

  .page-about .about-stage {
    padding: 22px 0 24px;
  }

  .page-about .about-stage::before {
    left: -45px;
    top: 30px;
  }
}

/* ---------- 宽屏常驻目录 ---------- */
@media (min-width: 1400px) {
  .page-about .about-toc {
    display: block;
    position: fixed;
    top: 128px;
    right: max(24px, calc((100vw - 1280px) / 2 - 260px));
    width: 224px;
    z-index: 20;
    background: var(--ink-2);
    border: 1px solid var(--about-rule);
    box-shadow: var(--shadow-press);
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-cat-tablist .tab,
  .page-about .about-imprint-links a,
  .page-about .about-toc-toggle,
  .page-about .about-toc-list a {
    transition: none;
  }
}
<<<END>>>
</main>