.page-about {
  --about-spine: 118px;
  --about-gap: 44px;
  display: block;
  background: var(--paper);
  color: var(--ink);
}

/* 面包屑 */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--slate-100);
}

.page-about .about-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.page-about .about-crumb li[aria-current="page"] {
  color: var(--ink);
}

/* 首屏 */
.page-about .about-mast {
  position: relative;
  padding: 40px 0 36px;
  border-bottom: var(--line);
}

.page-about .about-mast .folio {
  display: block;
  margin-bottom: 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cinnabar);
}

.page-about .about-mast h1 {
  position: relative;
  margin: 0 0 20px;
  padding-left: 16px;
  max-width: 22ch;
  font-family: var(--serif);
  font-size: clamp(28px, 6vw, 42px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-shadow: 0 .5px 0 rgba(30, 28, 26, .16);
}

.page-about .about-mast h1::before {
  content: "";
  position: absolute;
  left: 0;
  top: .18em;
  width: 3px;
  height: 1.1em;
  background: var(--cinnabar);
}

.page-about .about-mast .lede {
  max-width: 34em;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  background: var(--slate-100);
  border: 1px solid var(--slate-100);
}

.page-about .about-stats > div {
  padding: 14px 16px 16px;
  background: var(--paper-warm);
}

.page-about .about-stats dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-stats dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 19px;
  letter-spacing: .02em;
  color: var(--ink);
}

/* 主体骨架 */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-spine {
  padding: 26px 0 0;
  border-bottom: var(--line);
}

.page-about .spine-label {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .spine-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 20px;
  list-style: none;
  overflow-x: auto;
}

.page-about .spine-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  border: 1px solid var(--slate-100);
  background: var(--paper-warm);
  color: var(--slate);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), color .16s var(--ease);
}

.page-about .spine-list a:hover,
.page-about .spine-list a:focus-visible {
  color: var(--cinnabar);
  transform: translateY(-2px);
  box-shadow: var(--shade);
}

.page-about .spine-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cinnabar);
}

.page-about .is-version .spine-num {
  color: var(--bamboo);
}

/* 章节 */
.page-about .about-sec {
  scroll-margin-top: 96px;
  padding: 40px 0 12px;
}

.page-about .about-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 24px;
  border-bottom: var(--line);
}

.page-about .about-head .folio {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cinnabar);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(20px, 4vw, 26px);
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: -0.005em;
}

.page-about .about-text {
  max-width: 36em;
}

.page-about .about-text p {
  margin: 0 0 1.15em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
}

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

.page-about .about-note {
  max-width: 36em;
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-note a {
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid var(--cinnabar-soft);
}

.page-about .about-note a:hover {
  border-bottom-color: var(--cinnabar);
}

/* 图版 */
.page-about .about-plate {
  margin: 30px 0 0;
}

.page-about .about-plate-frame {
  background: var(--paper-warm);
  border: 1px solid var(--slate-100);
  box-shadow: var(--shade);
  overflow: hidden;
}

.page-about .about-plate img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.94);
  transition: transform .3s var(--ease);
}

.page-about .about-plate[data-shape="wide"] img {
  aspect-ratio: 16 / 10;
}

.page-about .about-plate[data-shape="chart"] img {
  aspect-ratio: 3 / 2;
}

.page-about .about-plate:hover img {
  transform: scale(1.012);
}

.page-about .about-plate-caption {
  margin: 11px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--index-yellow);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* 编辑流程 */
.page-about .step-list {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--slate-100);
  border-top: 1px solid var(--slate-100);
  border-bottom: 1px solid var(--slate-100);
}

.page-about .step-list > li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 0 14px;
  padding: 16px 4px 18px 0;
  background: var(--paper);
}

.page-about .step-num {
  padding-top: 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cinnabar);
}

.page-about .step-list h3 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .step-list p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* 版本折叠 */
.page-about .version-band {
  position: relative;
  margin: 28px 0 0;
  padding: 8px 20px 14px;
  background: var(--paper-warm);
  border: 1px solid var(--slate-100);
  box-shadow: var(--shade);
}

.page-about .version-band::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 20px 20px 0;
  border-color: transparent var(--paper) transparent transparent;
}

.page-about .version-band .panel {
  border-bottom: var(--line);
}

.page-about .version-band .panel:last-child {
  border-bottom: 0;
}

.page-about .version-band .panel summary {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  padding: 16px 0;
}

.page-about .version-band .panel-body {
  padding: 0 0 18px;
}

.page-about .version-band .panel-body p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

/* 深色区块：团队 */
.page-about .slab {
  position: relative;
  padding: 28px 20px 32px;
  background: var(--deep);
  color: var(--paper);
  box-shadow: var(--shade);
}

.page-about .slab .about-head {
  border-bottom-color: rgba(247, 244, 236, .24);
}

.page-about .slab .about-head h2 {
  color: var(--paper);
}

.page-about .slab .about-head .folio {
  color: var(--cinnabar-soft);
}

.page-about .slab-lede {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 244, 236, .82);
}

.page-about .team-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(247, 244, 236, .18);
}

.page-about .team-list > li {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--deep);
  transition: background .18s var(--ease);
}

.page-about .team-list > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 18px;
  width: 2px;
  background: var(--cinnabar);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .18s var(--ease);
}

.page-about .team-list > li:hover,
.page-about .team-list > li:focus-within {
  background: rgba(247, 244, 236, .07);
}

.page-about .team-list > li:hover::before,
.page-about .team-list > li:focus-within::before {
  transform: scaleY(1);
}

.page-about .team-city {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cinnabar-soft);
}

.page-about .team-role {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .team-desc {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 244, 236, .74);
}

.page-about .slab .about-plate-frame {
  border-color: rgba(247, 244, 236, .22);
  background: rgba(247, 244, 236, .06);
  box-shadow: none;
}

.page-about .slab .about-plate-caption {
  border-left-color: var(--cinnabar);
  color: rgba(247, 244, 236, .68);
}

/* 资质 */
.page-about .cred-list {
  display: grid;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .cred {
  display: grid;
  gap: 5px;
  padding: 14px 16px 16px;
  background: var(--paper-warm);
  border: 1px solid var(--slate-100);
  box-shadow: var(--shade);
  transition: transform .16s var(--ease), box-shadow .16s var(--ease);
}

.page-about .cred:hover {
  transform: translateY(-2px);
  box-shadow: var(--shade-lift);
}

.page-about .cred-name {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .cred-meta {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .cred:hover .cred-meta {
  color: var(--slate);
}

/* 合作伙伴名录 */
.page-about .partner-list {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--slate-100);
  border-top: 1px solid var(--slate-100);
  border-bottom: 1px solid var(--slate-100);
}

.page-about .partner-list > li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 15px 4px 16px 0;
  background: var(--paper);
  transition: background .18s var(--ease);
}

.page-about .partner-cat {
  grid-row: span 2;
  padding-top: 3px;
  align-self: start;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--bamboo);
}

.page-about .partner-name {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .partner-note {
  max-width: 34em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  transition: color .18s var(--ease), transform .18s var(--ease);
}

.page-about .partner-list > li:hover {
  background: var(--paper-warm);
}

.page-about .partner-list > li:hover .partner-note {
  color: var(--slate);
  transform: translateX(4px);
}

/* 后续指向 */
.page-about .next-list {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .next-list a {
  display: grid;
  gap: 5px;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--slate-100);
  text-decoration: none;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), border-color .16s var(--ease);
}

.page-about .next-list a:hover,
.page-about .next-list a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cinnabar);
  box-shadow: var(--shade-lift);
}

.page-about .next-title {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .next-list a:hover .next-title {
  color: var(--cinnabar);
}

.page-about .next-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .about-mast {
    padding: 56px 0 44px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 36px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-spine) minmax(0, 1fr);
    column-gap: var(--about-gap);
  }

  .page-about .about-spine {
    position: sticky;
    top: 88px;
    align-self: start;
    padding: 62px 0 0;
    border-bottom: 0;
  }

  .page-about .spine-label {
    padding-left: 22px;
  }

  .page-about .spine-list {
    display: block;
    overflow: visible;
    padding: 0 0 0 22px;
    position: relative;
  }

  .page-about .spine-list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--slate-100);
  }

  .page-about .spine-list > li {
    position: relative;
  }

  .page-about .spine-list > li::before {
    content: "";
    position: absolute;
    left: -22px;
    top: 17px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--paper);
    border: 1px solid var(--slate-100);
    z-index: 1;
  }

  .page-about .spine-list > li.is-version::before {
    background: var(--cinnabar);
    border-color: var(--cinnabar);
  }

  .page-about .spine-list > li.is-start::before {
    background: var(--bamboo);
    border-color: var(--bamboo);
  }

  .page-about .spine-list a {
    display: block;
    padding: 10px 0;
    border: 0;
    background: transparent;
    white-space: normal;
  }

  .page-about .spine-list a:hover,
  .page-about .spine-list a:focus-visible {
    transform: none;
    box-shadow: none;
    background: transparent;
  }

  .page-about .spine-num {
    display: block;
    margin-bottom: 2px;
  }

  .page-about .spine-text {
    display: block;
    font-size: 13px;
    color: var(--slate);
  }

  .page-about .about-sec {
    padding: 56px 0 14px;
  }

  .page-about .about-sec:first-child {
    padding-top: 18px;
  }

  .page-about .slab {
    padding: 36px 40px 40px;
  }

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

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

  .page-about .about-plate {
    margin-top: 38px;
  }

  .page-about .about-plate[data-shape="wide"] {
    margin-right: -24px;
  }
}

@media (min-width: 1080px) {
  .page-about .team-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .slab-lede {
    max-width: 40em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .spine-list a,
  .page-about .cred,
  .page-about .next-list a,
  .page-about .about-plate img,
  .page-about .partner-note,
  .page-about .team-list > li::before {
    transition: none;
  }

  .page-about .about-plate:hover img {
    transform: none;
  }
}
<<<END>>>