.page-about {
  --about-shell: 1180px;
  --about-rail-w: 44px;
  --about-gap: 20px;
  background: var(--ink-950);
  color: var(--mist-100);
  padding: 0 var(--gutter) clamp(56px, 8vw, 120px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  max-width: var(--about-shell);
  margin: 0 auto;
  padding: clamp(22px, 3.2vw, 36px) 0 clamp(10px, 1.6vw, 18px);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--violet-haze);
}
.page-about .breadcrumb a {
  color: var(--violet-haze);
  text-decoration: none;
  transition: color 160ms var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan-signal);
}

/* ---------- 首屏 ---------- */
.page-about__intro,
.page-about__step,
.page-about__cta,
.page-about__banner {
  max-width: var(--about-shell);
  margin-left: auto;
  margin-right: auto;
}

.page-about__intro {
  padding-top: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(30px, 4.5vw, 56px);
}

.page-about .page-about__headline {
  font-family: var(--font-display);
  font-weight: 400;
  font-stretch: condensed;
  font-size: clamp(38px, 7.6vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--flash-white);
  margin: 18px 0 0;
  max-width: 16ch;
}

.page-about__lede {
  font-size: clamp(16px, 1.55vw, 18.5px);
  line-height: 1.9;
  color: var(--mist-100);
  max-width: 62ch;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
}

.page-about__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-hair);
  border: 1px solid var(--line-hair);
  margin: clamp(30px, 4vw, 48px) 0 0;
}

.page-about__fact {
  background: var(--ink-850);
  padding: 18px 16px 20px;
}

.page-about__fact dt {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--violet-haze);
  text-transform: uppercase;
  margin: 0 0 8px;
}

.page-about__fact dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about__fact-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 5.2vw, 48px);
  line-height: 1;
  color: var(--flash-white);
  letter-spacing: -0.01em;
}

.page-about__fact-unit {
  font-size: 13px;
  color: var(--cyan-signal);
  letter-spacing: 0.04em;
}

/* ---------- 横幅 ---------- */
.page-about__banner {
  margin-top: clamp(8px, 1.6vw, 18px);
  margin-bottom: clamp(12px, 2vw, 24px);
}

.page-about .page-about__banner img,
.page-about .page-about__fig img,
.page-about .page-about__team-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 长卷章节 ---------- */
.page-about .page-about__step {
  display: grid;
  grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  column-gap: var(--about-gap);
  padding: clamp(44px, 6vw, 88px) 0;
  border-top: 1px solid var(--line-hair);
  scroll-margin-top: 108px;
}

.page-about__rail {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 4px;
}

.page-about__rail::before {
  content: "";
  position: absolute;
  top: 28px;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: var(--line-hair);
}

.page-about__rail-num {
  position: relative;
  z-index: 1;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--violet-haze);
  background: var(--ink-950);
  padding: 2px 0 6px;
  transition: color 220ms var(--ease);
}

.page-about__step.is-current .page-about__rail-num {
  color: var(--cyan-signal);
}

.page-about__step.is-current .page-about__rail::before {
  background: linear-gradient(180deg, var(--cyan-signal) 0%, var(--line-hair) 72%);
}

.page-about__panel {
  min-width: 0;
}

.page-about .page-about__panel .chapter__title {
  margin-top: 12px;
  margin-bottom: 0;
}

.page-about__text {
  font-size: 17px;
  line-height: 1.88;
  color: var(--mist-100);
  max-width: 64ch;
  margin: clamp(16px, 2vw, 22px) 0 0;
}

.page-about__sub-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2.1vw, 24px);
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--flash-white);
  margin: 0 0 14px;
}

/* ---------- 章节 01 时间线 ---------- */
.page-about__timeline {
  list-style: none;
  margin: clamp(28px, 3.6vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about__node {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px) clamp(24px, 3vw, 34px);
  border-left: 1px solid var(--line-hair);
}
.page-about__node:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about__node-mark {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-750);
  border: 1px solid var(--line-hair);
}
.page-about__node:first-child .page-about__node-mark,
.page-about__node:last-child .page-about__node-mark {
  background: var(--cyan-signal);
  border-color: var(--cyan-signal);
}

.page-about__node-era {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cyan-signal);
}

.page-about__node-text {
  margin: 8px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-100);
  max-width: 56ch;
}

/* ---------- 章节 02 工位档案卡 ---------- */
.page-about__desks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about .page-about__desk {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--ink-850);
  border: 1px solid var(--line-hair);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.02), 0 12px 30px -22px rgba(0, 0, 0, 0.9);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .page-about__desk:hover {
  border-color: var(--haze-600);
  transform: translateY(-2px);
}

.page-about .page-about__desk:focus-visible {
  outline: 0;
  border-color: var(--cyan-signal);
  box-shadow: 0 0 0 1px var(--cyan-signal);
}

.page-about__desk .archive-card__tab {
  position: absolute;
  top: -1px;
  left: 20px;
  transform: translateY(-100%);
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  background: var(--haze-600);
  color: var(--mist-100);
}

.page-about__desk .archive-card__meta {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--violet-haze);
  margin: 0 0 10px;
}

.page-about__desk .archive-card__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 2.2vw, 25px);
  line-height: 1.3;
  color: var(--flash-white);
  margin: 0 0 10px;
}

.page-about__desk .archive-card__text {
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--mist-100);
  margin: 0;
}

.page-about__desk .archive-card__foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-hair);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--cyan-signal);
}

/* ---------- 章节 03 数据来源 ---------- */
.page-about__grid-pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-hair);
  border: 1px solid var(--line-hair);
  margin: clamp(26px, 3.4vw, 40px) 0 0;
}

.page-about__source-block {
  background: var(--ink-750);
  padding: 26px 22px 28px;
  position: relative;
  overflow: hidden;
}

.page-about__source-block::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: var(--cyan-signal);
}

.page-about__source-block--orange::after {
  background: var(--orange-track);
}

.page-about__source-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(46px, 7.4vw, 76px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--flash-white);
}

.page-about__source-block--orange .page-about__source-num {
  color: var(--orange-track);
}

.page-about__source-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 1.9vw, 21px);
  letter-spacing: 0.02em;
  color: var(--cyan-signal);
  margin: 14px 0 8px;
}

.page-about__source-block--orange .page-about__source-title {
  color: var(--orange-track);
}

.page-about__source-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist-100);
}

.page-about__fig {
  margin: clamp(28px, 3.6vw, 44px) 0 0;
}

/* ---------- 章节 04 节奏 ---------- */
.page-about__sync {
  list-style: none;
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-hair);
}

.page-about__sync li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-hair);
}

.page-about__sync-time {
  flex: 0 0 auto;
  min-width: 5.5em;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--cyan-signal);
}

.page-about__sync-desc {
  flex: 1 1 16ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--mist-100);
}

.page-about__version {
  margin-top: clamp(24px, 3vw, 34px);
  padding: 22px 20px;
  border-left: 2px solid var(--orange-track);
  background: var(--ink-850);
}

.page-about__version-lead {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist-100);
  max-width: 62ch;
}

.page-about__trend-wrap {
  margin-top: clamp(32px, 4.2vw, 52px);
}

.page-about__trend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about__trend-row {
  display: grid;
  grid-template-columns: 5.6em minmax(0, 1fr) 3.4em;
  align-items: center;
  gap: 12px;
}

.page-about__trend-era {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--violet-haze);
  white-space: nowrap;
}

.page-about__trend-bar {
  display: block;
  height: 6px;
  background: var(--ink-750);
  position: relative;
  overflow: hidden;
}

.page-about__trend-fill {
  display: block;
  height: 100%;
  width: var(--bar, 0%);
  background: linear-gradient(90deg, var(--cyan-signal), var(--orange-track));
  transition: filter 180ms var(--ease);
}

.page-about__trend-row:hover .page-about__trend-fill,
.page-about__trend-row:focus-within .page-about__trend-fill {
  filter: brightness(1.25);
}

.page-about__trend-val {
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  text-align: right;
  color: var(--flash-white);
}

.page-about__trend-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--violet-haze);
  max-width: 58ch;
}

/* ---------- 章节 05 团队 ---------- */
.page-about__team-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.4vw, 42px);
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about__team-copy p {
  font-size: 16px;
  line-height: 1.86;
  color: var(--mist-100);
  margin: 0 0 16px;
  max-width: 56ch;
}

.page-about__team-fig {
  margin: 0;
}

/* ---------- 章节 06 奖项 ---------- */
.page-about__awards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about__award {
  position: relative;
  padding: 24px 22px 22px 26px;
  background: var(--ink-850);
  border: 1px solid var(--line-hair);
}

.page-about__award-mark {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan-signal);
}

.page-about__award--orange .page-about__award-mark {
  background: var(--orange-track);
}

.page-about__award-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.32;
  color: var(--flash-white);
  margin: 0 0 10px;
}

.page-about__award-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist-100);
  max-width: 52ch;
}

/* ---------- 收尾 ---------- */
.page-about .page-about__cta {
  margin-top: clamp(44px, 6vw, 84px);
  padding: clamp(34px, 4.6vw, 58px) clamp(22px, 3.4vw, 48px);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(43, 227, 210, 0.1) 0%, transparent 58%),
    linear-gradient(160deg, var(--ink-850) 0%, var(--ink-950) 100%);
  border: 1px solid var(--line-hair);
}

.page-about .page-about__cta .chapter__title {
  margin-top: 14px;
  max-width: 20ch;
}

.page-about__cta-text {
  margin: clamp(16px, 2vw, 22px) 0 0;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--mist-100);
  max-width: 58ch;
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* ---------- 短屏与中屏 ---------- */
@media (max-width: 600px) {
  .page-about {
    --about-rail-w: 28px;
    --about-gap: 13px;
  }
  .page-about__facts {
    grid-template-columns: 1fr;
  }
  .page-about__trend-row {
    grid-template-columns: 4.6em minmax(0, 1fr) 3em;
    gap: 9px;
  }
  .page-about__sync li {
    flex-direction: column;
    gap: 4px;
  }
  .page-about__sync-time {
    min-width: 0;
  }
  .page-about__rail::before {
    top: 24px;
  }
}

@media (min-width: 760px) {
  .page-about__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about__desks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 18px;
  }
  .page-about__grid-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about__awards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about__team-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-rail-w: 72px;
    --about-gap: 32px;
  }
  .page-about__intro {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(32px, 4vw, 64px);
    align-items: end;
  }
  .page-about__intro > .index-label,
  .page-about__intro > .page-about__headline,
  .page-about__intro > .page-about__lede {
    grid-column: 1;
  }
  .page-about__facts {
    grid-column: 2;
    grid-row: 1 / span 3;
    align-self: stretch;
    margin: 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about__team-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}
<<<END>>>

.page-about {
  --bar: 1rem;
}