.page-about {
  --about-gap: clamp(52px, 7.5vw, 96px);
  --about-rail: 23px;
  background: var(--night);
  color: var(--ivory);
  padding-bottom: clamp(64px, 9vw, 108px);
  overflow-x: clip;
}

.page-about .about-wrap {
  position: relative;
}

.page-about [id] {
  scroll-margin-top: 96px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 30px;
}

/* ---------- 首屏 ---------- */
.page-about .about-head {
  padding: 4px 0 var(--about-gap);
  border-bottom: 1px solid var(--line);
}

.page-about .about-coord {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--blue-line);
  margin: 0 0 22px;
}

.page-about .about-coord span {
  color: var(--gold);
}

.page-about .about-title {
  font-family: var(--font-sans);
  font-size: clamp(32px, 6.2vw, 60px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ivory);
  margin: 0 0 24px;
  max-width: 14em;
}

.page-about .about-lede {
  font-size: 17px;
  line-height: 1.75;
  color: var(--grey);
  max-width: 46ch;
  margin: 0 0 38px;
}

.page-about .about-jump {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ivory);
  font-size: 14px;
  text-decoration: none;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(226, 167, 58, .08);
}

.page-about .about-jump .jump-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--blue-line);
}

.page-about .about-jump a:hover .jump-idx,
.page-about .about-jump a:focus-visible .jump-idx {
  color: var(--gold);
}

/* ---------- 版本总览图 ---------- */
.page-about .about-overview {
  margin: var(--about-gap) 0 0;
  aspect-ratio: 1400 / 600;
  border-radius: 4px 20px 4px 20px;
  overflow: hidden;
}

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

.page-about .about-overview figcaption {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--grey);
  padding: 10px 2px 0;
}

/* ---------- 纵向时间轴 ---------- */
.page-about .about-axis {
  position: relative;
  margin-top: var(--about-gap);
  padding-left: 46px;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: var(--about-rail);
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--blue-line) 0%, rgba(110, 143, 163, .35) 45%, rgba(110, 143, 163, .1) 100%);
}

.page-about .tl-block {
  position: relative;
  padding-bottom: 58px;
}

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

.page-about .tl-mark {
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  text-align: center;
}

.page-about .tl-mark::before {
  content: "";
  display: block;
  width: 11px;
  height: 11px;
  margin: 5px auto 8px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--gold);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .tl-kicker {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  color: var(--blue-line);
  white-space: nowrap;
}

.page-about .tl-title {
  font-family: var(--font-sans);
  font-size: clamp(21px, 3.4vw, 29px);
  font-weight: 900;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--ivory);
  margin: 0 0 16px;
}

.page-about .tl-body p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--grey);
  margin: 0 0 14px;
  max-width: 52ch;
}

.page-about .tl-tip {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--gold);
  border-left: 2px solid var(--gold);
  padding-left: 12px;
  margin: 20px 0 0;
  max-width: 46ch;
}

.page-about .tl-link {
  margin: 20px 0 0;
}

.page-about .tl-link .btn {
  font-size: 14px;
}

.page-about .tl-figure {
  margin: 24px 0 0;
  border-radius: 4px 16px 4px 16px;
  overflow: hidden;
}

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

.page-about .tl-figure figcaption {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--grey);
  padding: 9px 2px 0;
}

/* ---------- 版本条目 ---------- */
.page-about .ver-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ver-item {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ver-year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--gold);
  padding-top: 3px;
}

.page-about .ver-item h3 {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ivory);
  margin: 0 0 6px;
}

.page-about .ver-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--grey);
  max-width: none;
}

/* ---------- 团队分工 ---------- */
.page-about .team-total {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin: 4px 0 26px;
  max-width: none;
}

.page-about .team-total strong {
  font-family: var(--font-mono);
  font-size: clamp(42px, 8vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .team-total span {
  font-size: 15px;
  line-height: 1.7;
  color: var(--grey);
  max-width: 30ch;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .team-cell {
  background: var(--felt);
  border: 1px solid rgba(110, 143, 163, .2);
  border-radius: 14px 4px 14px 14px;
  padding: 15px 14px 17px;
  transition: background-color .25s ease, border-color .25s ease, transform .25s ease;
}

.page-about .team-cell:hover {
  background: var(--felt-deep);
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .cell-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .team-cell h3 {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ivory);
  margin: 0 0 8px;
}

.page-about .team-cell p {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--grey);
  margin: 0;
  max-width: none;
}

/* ---------- 桌面端：中轴 + 左右交替 ---------- */
@media (min-width: 900px) {
  .page-about .about-axis {
    padding-left: 0;
  }

  .page-about .about-axis::before {
    left: 50%;
    top: 12px;
  }

  .page-about .tl-block {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 78px;
    padding-bottom: 78px;
  }

  .page-about .tl-block .tl-body {
    grid-row: 1;
  }

  .page-about .tl-block:nth-child(odd) .tl-body {
    grid-column: 1;
  }

  .page-about .tl-block:nth-child(even) .tl-body {
    grid-column: 2;
  }

  .page-about .tl-mark {
    left: 50%;
    top: 0;
    width: 92px;
    margin-left: -46px;
  }

  .page-about .tl-body p {
    max-width: 44ch;
  }

  .page-about .tl-body .team-total,
  .page-about .tl-body .ver-item p,
  .page-about .tl-body .team-cell p {
    max-width: none;
  }
}

@media (min-width: 1180px) {
  .page-about .about-title {
    max-width: 12em;
  }

  .page-about .tl-body p {
    max-width: 46ch;
  }
}
<<<END>>>