.page-about {
  --about-paper-ink: #3B3025;
  --about-paper-muted: #6B5C48;
  --about-rule: var(--line);
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 18px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  opacity: .34;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.55) contrast(1.08);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(10, 15, 28, .5) 0%, rgba(10, 15, 28, .88) 58%, var(--ink-900) 100%),
    linear-gradient(90deg, rgba(10, 15, 28, .8) 0%, rgba(10, 15, 28, .1) 70%);
}

.page-about .about-hero__body {
  position: relative;
  z-index: 1;
  padding-top: 64px;
  padding-bottom: 48px;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 13em;
  font-size: clamp(2rem, 9vw, 3.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -.025em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__facts b {
  color: var(--orange);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
}

.page-about .about-hero__facts span {
  color: var(--muted);
  font-size: .8rem;
  letter-spacing: .04em;
}

/* ---------- 通用小标题 ---------- */

.page-about .about-head {
  max-width: 42em;
  margin-bottom: 26px;
}

.page-about .about-head__kicker {
  margin: 0 0 10px;
  color: var(--cyan);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.page-about .about-head h2 {
  margin: 0 0 12px;
  font-size: clamp(1.45rem, 6vw, 2.1rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.015em;
}

.page-about .about-head__lead {
  margin: 0;
  color: var(--mist);
  line-height: 1.8;
}

/* ---------- 内容准则 ---------- */

.page-about .about-creed {
  background-color: var(--ink-850);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-creed__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-creed__list > li {
  background: var(--ink-850);
  padding: 22px 4px 24px;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: start;
}

.page-about .about-creed__no {
  grid-row: 1;
  color: var(--orange);
  font-size: .85rem;
  font-weight: 700;
  padding-top: 3px;
}

.page-about .about-creed__list h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-creed__list p {
  margin: 0;
  color: var(--mist);
  font-size: .95rem;
  line-height: 1.78;
}

/* ---------- 版本演进 ---------- */

.page-about .about-version {
  background: var(--ink-900);
}

.page-about .about-version__layout {
  display: grid;
  gap: 30px;
}

.page-about .about-rail__card {
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  background: var(--ink-800);
  padding: 18px 18px 20px;
}

.page-about .about-rail__mark {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: .68rem;
  letter-spacing: .2em;
}

.page-about .about-rail__name {
  margin: 0 0 4px;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-rail__tag {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: .88rem;
}

.page-about .about-rail__note {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.7;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 28px;
  padding-bottom: 16px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: -2px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

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

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 11px;
  height: 11px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 240, 208, .1);
}

.page-about .about-timeline__item:last-child::after {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(88, 192, 138, .12);
}

.page-about .about-node {
  border: 1px solid var(--line);
  background: var(--ink-850);
}

.page-about .about-node[open] {
  border-color: rgba(53, 240, 208, .4);
}

.page-about .about-node__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 13px 15px;
  transition: background .18s var(--ease);
}

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

.page-about .about-node__summary:hover {
  background: var(--ink-800);
}

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-node__ver {
  color: var(--orange);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-node__name {
  font-size: .98rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-node__stage {
  color: var(--muted);
  font-size: .76rem;
  letter-spacing: .06em;
}

.page-about .about-node__ind {
  margin-left: auto;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  transition: transform .2s var(--ease);
}

.page-about .about-node[open] .about-node__ind {
  transform: rotate(45deg);
}

.page-about .about-node__body {
  border-top: 1px solid var(--line-soft);
  padding: 14px 15px 18px;
}

.page-about .about-node__body p {
  margin: 0 0 10px;
  color: var(--mist);
  font-size: .93rem;
  line-height: 1.78;
}

.page-about .about-node__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-node__points li {
  position: relative;
  padding-left: 14px;
  color: var(--muted);
  font-size: .85rem;
  line-height: 1.7;
}

.page-about .about-node__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 5px;
  background: var(--cyan);
}

/* ---------- 团队与协作 ---------- */

.page-about .about-team {
  background: var(--paper);
  color: var(--about-paper-ink);
  border-top: 1px solid var(--paper-deep);
  border-bottom: 1px solid var(--paper-deep);
}

.page-about .about-team .about-head__kicker {
  color: #A0522D;
}

.page-about .about-team h2 {
  margin: 0 0 16px;
  font-size: clamp(1.45rem, 6vw, 2.1rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--about-paper-ink);
}

.page-about .about-team__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team__text p {
  margin: 0 0 14px;
  color: var(--about-paper-ink);
  font-size: .98rem;
  line-height: 1.85;
  max-width: 36em;
}

.page-about .about-team__facts {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(42, 33, 24, .18);
  display: grid;
  gap: 14px;
}

.page-about .about-team__facts div {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.page-about .about-team__facts dt {
  color: var(--about-paper-muted);
  font-size: .8rem;
  letter-spacing: .06em;
}

.page-about .about-team__facts dd {
  margin: 0;
  color: var(--about-paper-ink);
  font-size: .92rem;
  line-height: 1.6;
}

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

.page-about .about-team__figure .figure__cap {
  color: var(--about-paper-muted);
}

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

.page-about .figure__frame {
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .figure__cap {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.65;
  letter-spacing: .02em;
}

/* ---------- 小屏优先 ---------- */

.page-about .about-small {
  background: var(--ink-900);
}

.page-about .about-small__grid {
  display: grid;
  gap: 30px;
}

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

.page-about .about-small__text h2 {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 6vw, 2.1rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -.015em;
}

.page-about .about-small__text p {
  margin: 0 0 14px;
  color: var(--mist);
  line-height: 1.85;
  max-width: 34em;
}

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

.page-about .about-small__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--mist);
  font-size: .9rem;
}

.page-about .about-small__list .mono {
  min-width: 3.6em;
  color: var(--orange);
  font-size: 1rem;
  font-weight: 700;
}

/* ---------- 对外口径 ---------- */

.page-about .about-boundary {
  background: var(--ink-850);
  border-top: 1px solid var(--line);
}

.page-about .about-boundary__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-boundary__list > li {
  background: var(--ink-850);
  padding: 18px 16px;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .about-boundary__tag {
  color: var(--red);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  padding-top: 2px;
}

.page-about .about-boundary__list p {
  margin: 0;
  color: var(--mist);
  font-size: .93rem;
  line-height: 1.75;
}

.page-about .about-boundary__foot {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-boundary__foot p {
  margin: 0;
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.8;
  max-width: 48em;
}

.page-about .about-boundary__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, .4);
}

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

.page-about .about-boundary__foot a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-creed__list > li {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 26px 8px 28px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__body {
    padding-top: 92px;
    padding-bottom: 64px;
  }

  .page-about .about-version__layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-rail__card {
    position: sticky;
    top: 84px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-small__grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    align-items: center;
    gap: 52px;
  }

  .page-about .about-small__figure {
    order: -1;
  }

  .page-about .about-creed__list h3 {
    font-size: 1.12rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-version__layout {
    grid-template-columns: 268px minmax(0, 1fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 440px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__ind,
  .page-about .about-node__summary {
    transition: none;
  }
}
<<<END>>>