.page-about {
  --about-line: rgba(59, 242, 228, 0.16);
  --about-line-strong: rgba(59, 242, 228, 0.44);
  --about-cyan-ghost: rgba(18, 167, 158, 0.12);
}

.page-about img {
  max-width: 100%;
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(26px, 4vw, 48px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate-400);
}

.page-about .breadcrumbs a {
  color: var(--slate-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cy-400);
  border-bottom-color: var(--cy-400);
}

.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--cy-400);
}

.page-about .breadcrumbs__sep {
  color: rgba(132, 148, 180, 0.5);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.5vw, 64px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  font-size: clamp(34px, 5.4vw, 76px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  font-weight: 200;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cy-400);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 44ch;
}

.page-about .about-hero__cta {
  margin: clamp(22px, 3vw, 32px) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: clamp(16px, 2vw, 22px) 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.page-about .about-hero__facts b {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cy-400);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__facts span {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--slate-400);
}

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

.page-about .about-hero__frame {
  border: 1px solid var(--about-line-strong);
}

/* ---------- 运营轨迹 ---------- */
.page-about .about-track__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 4.5vw, 64px);
}

.page-about .about-track__copy p {
  margin: 0 0 1.1em;
  max-width: 48ch;
  color: var(--slate-400);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-track__copy h2 {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
}

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

.page-about .about-ticks__item {
  position: relative;
  padding: 0 0 clamp(20px, 2.8vw, 30px) clamp(22px, 3vw, 34px);
}

.page-about .about-ticks__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--cy-400);
}

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

.page-about .about-ticks__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--paper-100);
  font-variant-numeric: tabular-nums;
}

.page-about .about-ticks__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-400);
}

/* ---------- 四步流程 ---------- */
.page-about .about-flow__head {
  max-width: 58ch;
}

.page-about .about-flow__head h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .about-flow__head .lede {
  margin: 0;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line-strong);
  border: 1px solid var(--about-line-strong);
}

.page-about .about-flow__step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(22px, 3vw, 30px);
  background: var(--ds-850);
  transition: background 0.16s ease;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cy-400);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.24s ease;
}

.page-about .about-flow__step:hover,
.page-about .about-flow__step:focus-within {
  background: var(--ds-700);
}

.page-about .about-flow__step:hover::before,
.page-about .about-flow__step:focus-within::before {
  transform: scaleX(1);
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cy-400);
}

.page-about .about-flow__step h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper-100);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .about-flow__note {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--cy-600);
  border-top: 1px solid transparent;
  padding-top: 0;
  transition: max-height 0.24s ease, opacity 0.24s ease, padding-top 0.24s ease, border-color 0.24s ease;
}

.page-about .about-flow__step:hover .about-flow__note,
.page-about .about-flow__step:focus-within .about-flow__note {
  max-height: 8em;
  opacity: 1;
  padding-top: 12px;
  border-top-color: var(--about-line);
}

/* ---------- 团队分工 ---------- */
.page-about .about-teams__head {
  max-width: 56ch;
}

.page-about .about-teams__head h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .about-teams__head .lede {
  margin: 0;
}

.page-about .about-teams__figure {
  margin: clamp(28px, 4vw, 48px) 0 clamp(24px, 3.4vw, 40px);
}

.page-about .about-teams__frame {
  border: 1px solid var(--about-line);
}

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

.page-about .about-team {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--ds-850);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--about-line-strong);
}

.page-about .about-team--lead {
  background: var(--ds-700);
  border-top-color: var(--cy-400);
}

.page-about .about-team__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cy-400);
}

.page-about .about-team h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  color: var(--paper-100);
}

.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .about-team__fit {
  margin-top: auto !important;
  padding-top: 12px;
  border-top: 1px solid var(--about-line);
  color: var(--paper-300) !important;
  font-size: 13px !important;
}

.page-about .about-teams__foot {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .about-teams__foot a {
  color: var(--cy-400);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line-strong);
  transition: border-color 0.16s ease;
}

.page-about .about-teams__foot a:hover,
.page-about .about-teams__foot a:focus-visible {
  border-bottom-color: var(--cy-400);
}

/* ---------- 版本刻度 ---------- */
.page-about .about-versions {
  position: relative;
  overflow: hidden;
}

.page-about .about-versions__veil {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-versions__veil img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
}

.page-about .about-versions__veil::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ds-950) 0%, rgba(5, 10, 24, 0.5) 45%, var(--ds-950) 100%);
}

.page-about .about-versions__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-versions__head {
  max-width: 58ch;
}

.page-about .about-versions__head h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .about-versions__head .lede {
  margin: 0;
}

.page-about .about-versions__rail {
  position: relative;
  margin-top: clamp(36px, 6vw, 72px);
}

.page-about .about-versions__line {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cy-600) 0%, var(--about-cyan-ghost) 100%);
}

.page-about .about-versions__marks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px 20px;
}

.page-about .about-versions__mark {
  position: relative;
  padding-top: 34px;
  outline: none;
  cursor: default;
}

.page-about .about-versions__mark::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--ds-950);
  border: 1px solid var(--cy-600);
  transition: background 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease, width 0.16s ease, height 0.16s ease, top 0.16s ease;
}

.page-about .about-versions__mark:hover::before,
.page-about .about-versions__mark:focus-visible::before,
.page-about .about-versions__mark.is-current::before {
  background: var(--cy-400);
  border-color: var(--cy-400);
}

.page-about .about-versions__mark.is-current::before {
  width: 13px;
  height: 13px;
  top: -6px;
  box-shadow: 0 0 0 4px rgba(59, 242, 228, 0.16);
}

.page-about .about-versions__mark:focus-visible {
  box-shadow: 0 0 0 2px var(--cy-400);
}

.page-about .about-versions__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--paper-100);
  font-variant-numeric: tabular-nums;
  transition: color 0.16s ease, font-size 0.16s ease;
}

.page-about .about-versions__mark:hover .about-versions__tag,
.page-about .about-versions__mark:focus-visible .about-versions__tag,
.page-about .about-versions__mark.is-current .about-versions__tag {
  color: var(--cy-400);
}

.page-about .about-versions__mark.is-current .about-versions__tag {
  font-size: 22px;
}

.page-about .about-versions__bubble {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-400);
  transition: max-height 0.2s ease, opacity 0.2s ease, margin-top 0.2s ease;
}

.page-about .about-versions__mark:hover .about-versions__bubble,
.page-about .about-versions__mark:focus-within .about-versions__bubble,
.page-about .about-versions__mark:focus-visible .about-versions__bubble,
.page-about .about-versions__mark.is-current .about-versions__bubble {
  max-height: 9em;
  opacity: 1;
  margin-top: 8px;
}

/* ---------- 内容节奏 ---------- */
.page-about .about-editorial__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4.5vw, 64px);
}

.page-about .about-editorial__copy h2 {
  margin: 0 0 clamp(16px, 2.2vw, 24px);
}

.page-about .about-editorial__copy p {
  margin: 0 0 1.05em;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .about-editorial__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px) !important;
}

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

.page-about .about-editorial__list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: clamp(14px, 2vw, 24px);
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-editorial__idx {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cy-400);
}

.page-about .about-editorial__list h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper-100);
}

.page-about .about-editorial__list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-400);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-teams__cols {
    grid-template-columns: 5fr 4fr 3fr;
    gap: clamp(18px, 2.2vw, 30px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-editorial__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(40px, 6vw, 88px);
  }
}

@media (min-width: 960px) {
  .page-about .about-track__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(40px, 7vw, 110px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow__step,
  .page-about .about-flow__step::before,
  .page-about .about-flow__note,
  .page-about .about-versions__mark::before,
  .page-about .about-versions__tag,
  .page-about .about-versions__bubble,
  .page-about .breadcrumbs a,
  .page-about .about-teams__foot a {
    transition: none;
  }
}
<<<END>>>