.page-about {
  --ab-dash: rgba(232, 236, 236, .22);
  --ab-ghost: rgba(232, 236, 236, .09);
  --ab-dim: rgba(232, 236, 236, .76);
  padding-bottom: clamp(48px, 8vw, 120px);
}

/* 首屏 */
.page-about .ab-hero { padding: clamp(26px, 5vw, 62px) 0 clamp(26px, 4vw, 46px); }
.page-about .ab-hero__grid { display: grid; gap: clamp(26px, 4vw, 52px); }
.page-about .ab-hero__title { margin: 12px 0 0; }
.page-about .ab-hero__title em { display: block; font-style: normal; color: var(--go); }
.page-about .ab-hero__lead { margin: clamp(14px, 2vw, 22px) 0 0; }

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-stat { background: var(--ink-2); padding: 16px 16px 18px; }
.page-about .ab-stat dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sand);
}
.page-about .ab-stat dd {
  margin: 8px 0 0;
  font-family: var(--f-mono);
  font-size: clamp(20px, 3.4vw, 26px);
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--amber);
}
.page-about .ab-stat dd span {
  margin-left: 2px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sand);
}

/* 章节索引 */
.page-about .ab-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-3);
}
.page-about .ab-index__list {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-index__list li { display: flex; }
.page-about .ab-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 13px 15px;
  font-size: 14px;
  color: var(--chalk);
  text-decoration: none;
  border-right: 1px solid var(--line);
  transition: background-color 150ms linear, color 150ms linear;
}
.page-about .ab-index__n {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--amber);
  transition: color 150ms linear;
}
.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible { background: var(--go); color: var(--ink); }
.page-about .ab-index__list a:hover .ab-index__n,
.page-about .ab-index__list a:focus-visible .ab-index__n { color: var(--ink); }

/* 时间线章节 */
.page-about .ab-flow { display: block; }
.page-about .ab-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: clamp(42px, 8vw, 100px) 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: clamp(34px, 6vw, 76px);
}
.page-about .ab-chapter__rail { display: none; }
.page-about .ab-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 26px;
  margin-bottom: clamp(12px, 2vw, 20px);
}
.page-about .ab-chapter__head .rs-h2 { margin: 0; }
.page-about .ab-year {
  font-family: var(--f-mono);
  font-size: clamp(30px, 6.6vw, 68px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--ab-ghost);
  white-space: nowrap;
}
.page-about .ab-chapter__body .rs-prose + .rs-prose { margin-top: 16px; }
.page-about .rs-prose a {
  color: var(--go);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 255, 158, .45);
  transition: background-color 150ms linear, color 150ms linear;
}
.page-about .rs-prose a:hover { background: var(--go); color: var(--ink); border-bottom-color: transparent; }

.page-about .ab-quote {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 18px 22px;
  max-width: 660px;
  border-left: 3px solid var(--go);
  background: var(--ink-2);
  font-family: var(--f-serif);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
  color: var(--chalk);
}

/* 团队分工卡 */
.page-about .ab-crew {
  display: grid;
  gap: 1px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-crew__item {
  background: var(--ink-2);
  padding: 20px 20px 24px;
  transition: background-color 150ms linear;
}
.page-about .ab-crew__item:hover { background: rgba(61, 255, 158, .06); }
.page-about .ab-crew__n {
  display: block;
  font-family: var(--f-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--go);
}
.page-about .ab-crew__role {
  display: block;
  margin-top: 10px;
  font-size: 16px;
  font-weight: 600;
  color: var(--chalk);
}
.page-about .ab-crew__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ab-dim);
}

/* 里程碑列表 */
.page-about .ab-mile {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-about .ab-mile__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 16px 20px 0;
  border-bottom: 1px solid var(--line);
  box-shadow: inset 3px 0 0 transparent;
  transition: box-shadow 150ms linear;
}
.page-about .ab-mile__item:hover { box-shadow: inset 3px 0 0 var(--go); }
.page-about .ab-mile__y {
  font-family: var(--f-mono);
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--amber);
  transition: color 150ms linear;
}
.page-about .ab-mile__item:hover .ab-mile__y { color: var(--go); }
.page-about .ab-mile__item .rs-h3 { margin: 0 0 6px; }
.page-about .ab-mile__item p {
  margin: 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-dim);
}

/* 每日节奏数据牌 */
.page-about .ab-marks {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-marks li {
  background: var(--ink-2);
  padding: 18px 18px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ab-dim);
}
.page-about .ab-marks b {
  display: block;
  margin-bottom: 8px;
  font-family: var(--f-mono);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--amber);
}

/* 图片 */
.page-about .ab-figure { margin: clamp(22px, 3vw, 34px) 0 0; }
.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--ink-2);
  object-fit: cover;
}
.page-about .ab-figure__cap {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sand);
}

/* 收尾 */
.page-about .ab-cta {
  border-top: 1px solid var(--line);
  background: var(--ink-3);
  padding: clamp(38px, 6vw, 80px) 0 clamp(30px, 5vw, 60px);
}
.page-about .ab-cta .rs-eyebrow { color: var(--go); }
.page-about .ab-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}
.page-about .ab-cta__note {
  margin: clamp(20px, 3vw, 26px) 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--sand);
}

/* 平板 */
@media (min-width: 700px) {
  .page-about .ab-crew { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .ab-marks { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-mile__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding-right: 24px;
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: end;
  }
  .page-about .ab-chapter {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
  }
  .page-about .ab-chapter__rail { display: block; position: relative; }
  .page-about .ab-chapter__rail::before {
    content: "";
    position: absolute;
    left: 27px;
    top: 0;
    bottom: 0;
    width: 1px;
    background-image: linear-gradient(to bottom, var(--ab-dash) 0, var(--ab-dash) 6px, transparent 6px, transparent 14px);
    background-size: 1px 14px;
    background-repeat: repeat-y;
  }
  .page-about .ab-chapter:first-child .ab-chapter__rail::before { top: 56px; }
  .page-about .ab-chapter:last-child .ab-chapter__rail::before { bottom: auto; height: 56px; }
  .page-about .ab-chapter__body { max-width: 880px; }
}

.page-about .ab-chapter__node {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--ink);
  border: 1px solid var(--ab-dash);
  font-family: var(--f-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--amber);
}
<<<END>>>