.page-about {
  --about-rail: 208px;
  --about-column-gap: 48px;
  --about-measure: 46em;
}

/* ── 顶部上下文条 ── */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: var(--sp-1);
  padding-bottom: var(--sp-1);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-topbar__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── 首屏 ── */
.page-about .about-masthead {
  padding-top: var(--sp-3);
  padding-bottom: var(--sp-3);
}

.page-about .about-masthead__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
}

.page-about .about-h1 {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 6.4vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-h1 em {
  display: block;
  font-style: normal;
  color: var(--pitch);
}

.page-about .about-lede {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.8;
  color: var(--ink-2);
}

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

.page-about .about-masthead__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-masthead__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--sp-3);
    align-items: end;
  }

  .page-about .about-masthead__fig img {
    aspect-ratio: 16 / 11;
  }
}

/* ── 正文双栏 ── */
.page-about .about-body {
  padding-top: var(--sp-2);
}

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

.page-about .about-rail {
  margin-bottom: var(--sp-2);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 2px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-rail__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--pitch);
  border-bottom-color: var(--pitch);
}

.page-about .about-rail__link[data-active="true"] {
  color: var(--pitch);
  border-bottom-color: var(--pitch);
}

.page-about .about-rail__link[data-active="true"] .about-rail__num {
  color: var(--pitch);
}

@media (min-width: 1024px) {
  .page-about .about-editorial {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar-h) + var(--sp-1));
    align-self: start;
    margin-bottom: 0;
    padding: 0 24px 0 0;
    border-bottom: none;
    border-right: 1px solid var(--rule);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 13px;
  }

  .page-about .about-rail__link {
    font-size: 13.5px;
  }

  .page-about .about-columns {
    min-width: 0;
    padding-left: var(--about-column-gap);
  }
}

/* ── 小节 ── */
.page-about .about-sec {
  padding-top: var(--sp-3);
  border-top: 1px solid var(--rule);
  scroll-margin-top: calc(var(--bar-h) + 28px);
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 24px;
}

.page-about .about-sec__num {
  flex: none;
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-sec__body {
  max-width: var(--about-measure);
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .about-sec__body p {
  margin: 0 0 20px;
}

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

.page-about .about-sec__body--after {
  margin-top: 28px;
}

.page-about .about-sec__body a {
  color: var(--pitch);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-sec__body a:hover,
.page-about .about-sec__body a:focus-visible {
  color: var(--ink);
}

/* ── 旁注 ── */
.page-about .about-note {
  max-width: var(--about-measure);
  margin: 28px 0 0;
  padding: 14px 18px;
  background: var(--paper-2);
  border-left: 2px solid var(--pitch);
}

.page-about .about-note__sum {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brown);
}

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

.page-about .about-note__sum::before {
  content: "+";
  font-family: var(--font-num);
  font-size: 14px;
  line-height: 1;
  color: var(--pitch);
}

.page-about .about-note[open] .about-note__sum::before {
  content: "–";
}

.page-about .about-note__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ── 六个栏目主题带 ── */
.page-about .about-pillars {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--ink);
  border: 1px solid var(--ink-2);
}

.page-about .about-pillars__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 17px 16px;
  font-size: 15px;
  color: var(--paper);
  border-right: 1px solid var(--ink-2);
  border-bottom: 1px solid var(--ink-2);
}

.page-about .about-pillars__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

@media (min-width: 700px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ── 团队分工 ── */
.page-about .about-teamtop {
  margin-top: 28px;
}

.page-about .about-teamtop__fig {
  margin: 0 0 26px;
}

.page-about .about-teamtop__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-teamgrid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-teamgrid li {
  display: flex;
}

.page-about .about-teamgrid__cell {
  display: block;
  width: 100%;
  padding: 18px 16px;
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-teamgrid__cell:hover,
.page-about .about-teamgrid__cell:focus-visible {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-teamgrid__num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--pitch);
}

.page-about .about-teamgrid__cell:hover .about-teamgrid__num,
.page-about .about-teamgrid__cell:focus-visible .about-teamgrid__num {
  color: var(--lime);
}

.page-about .about-teamgrid__name {
  display: block;
  margin-top: 9px;
  font-size: 15px;
  font-weight: 600;
}

.page-about .about-teamgrid__desc {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-teamgrid__cell:hover .about-teamgrid__desc,
.page-about .about-teamgrid__cell:focus-visible .about-teamgrid__desc {
  color: var(--paper-2);
}

@media (min-width: 780px) {
  .page-about .about-teamtop {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: var(--sp-2);
    align-items: start;
  }

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

.page-about .about-team {
  max-width: var(--about-measure);
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  scroll-margin-top: calc(var(--bar-h) + 28px);
}

.page-about .about-team__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-team p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ── 版本时间带 ── */
.page-about .about-versions {
  margin-top: 30px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

@media (min-width: 760px) {
  .page-about .about-versions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-ver {
  background: var(--paper);
}

.page-about .about-ver[open] {
  background: var(--paper-2);
}

.page-about .about-ver__sum {
  position: relative;
  display: block;
  list-style: none;
  cursor: pointer;
  padding: 22px 16px 18px;
}

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

.page-about .about-ver__sum::after {
  content: "";
  position: absolute;
  top: 0;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--pitch);
  transition: background-color 0.2s ease;
}

.page-about .about-ver[open] .about-ver__sum::after {
  background: var(--orange);
}

.page-about .about-ver__num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-ver__name {
  display: block;
  margin-top: 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-ver__when {
  display: block;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--pitch);
}

.page-about .about-ver__body {
  padding: 0 16px 20px;
}

.page-about .about-ver__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

/* ── 用户统计 ── */
.page-about .about-stats {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  padding: 20px 16px;
  background: var(--paper);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ── 结尾行动带 ── */
.page-about .about-cta {
  margin-top: var(--sp-4);
  padding: var(--sp-3) 0;
  background: var(--ink);
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

@media (min-width: 820px) {
  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-2);
  }
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-teamgrid__cell,
  .page-about .about-ver__sum::after {
    transition: none;
  }
}
<<<END>>>