.page-about {
  --about-gap: clamp(28px, 4vw, 56px);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(40px, 7vw, 88px) clamp(36px, 5vw, 64px);
}

.page-about .about-hero__bleed {
  position: absolute;
  top: -12%;
  right: -24%;
  width: min(760px, 108vw);
  height: clamp(280px, 48vw, 460px);
  background:
    radial-gradient(120% 120% at 78% 6%, rgba(15, 163, 107, 0.55), rgba(53, 231, 224, 0.16) 46%, rgba(4, 18, 27, 0) 74%),
    linear-gradient(200deg, rgba(52, 211, 153, 0.18), rgba(4, 18, 27, 0) 60%);
  clip-path: polygon(16% 0, 100% 0, 100% 82%, 0 100%);
  pointer-events: none;
}

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

.page-about .about-hero__tag {
  position: absolute;
  top: clamp(96px, 14vw, 160px);
  right: 8px;
  z-index: 1;
  color: var(--cyan-400);
  opacity: 0.75;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--text-100);
}

.page-about .about-hero__lede {
  max-width: 42ch;
  margin-top: 20px;
  color: var(--text-300);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(28px, 4vw, 46px);
  max-width: 760px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-sm);
  background: rgba(10, 30, 43, 0.72);
}

.page-about .about-stat__num {
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  color: var(--track-400);
  letter-spacing: -0.01em;
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-300);
}

/* 主体框架 */
.page-about .about-shell {
  display: block;
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-section {
  padding-block: clamp(32px, 5vw, 60px);
  border-top: 1px solid var(--ink-700);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .about-section__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-size: clamp(23px, 4.2vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--text-100);
  max-width: 22ch;
}

.page-about .about-section__note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--text-300);
}

.page-about .about-copy {
  display: grid;
  gap: 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-300);
  max-width: 40em;
}

.page-about .about-copy p {
  margin: 0;
}

.page-about .about-copy--single {
  margin-bottom: 24px;
  max-width: 38em;
}

/* 图版 */
.page-about .about-figure {
  margin: 24px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--ink-700);
  background: var(--ink-850);
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 6;
}

.page-about .about-figure--desk img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-300);
  letter-spacing: 0.02em;
}

.page-about .about-duo {
  display: grid;
  gap: 8px;
}

/* 版本时间轴 */
.page-about .about-section--timeline {
  position: relative;
}

.page-about .version-track {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 4px 0 16px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .version-node {
  position: relative;
  flex: 0 0 min(240px, 76vw);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 18px 20px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(15, 163, 107, 0.16), rgba(10, 30, 43, 0.9) 62%);
  text-decoration: none;
  color: var(--text-100);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 34px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--cyan-400);
}

.page-about .version-node--now {
  background: linear-gradient(180deg, rgba(255, 122, 47, 0.22), rgba(10, 30, 43, 0.92) 62%);
  border-color: rgba(255, 122, 47, 0.45);
}

.page-about .version-node--now::before {
  background: var(--flare-500);
}

.page-about .version-node:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-about .version-node__tag {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
}

.page-about .version-node--now .version-node__tag {
  color: var(--flare-500);
}

.page-about .version-node__name {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .version-node__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-300);
}

.page-about .version-list {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

.page-about .version-detail {
  padding: 18px 20px;
  border-left: 2px solid var(--track-600);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--ink-850);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-about .version-detail__tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--track-400);
}

.page-about .version-detail__title {
  margin: 6px 0 8px;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--text-100);
}

.page-about .version-detail p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-300);
}

.page-about .about-section--timeline .about-figure--square {
  max-width: 420px;
}

/* 团队分工 */
.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .role-card {
  padding: 18px 20px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: var(--ink-850);
}

.page-about .role-card__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.page-about .role-card__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-100);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-300);
}

/* 专题研究板 */
.page-about .about-topics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-topics .topic-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: var(--ink-850);
}

.page-about .about-topics .topic-card__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--track-400);
  letter-spacing: -0.01em;
}

.page-about .about-topics .topic-card__summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-100);
}

.page-about .about-topics .topic-card__bounds {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--ink-700);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-300);
}

.page-about .about-topics .topic-card__terms {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-topics .topic-card__more {
  margin-top: auto;
  font-size: 13px;
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 231, 224, 0.4);
  align-self: flex-start;
  padding-bottom: 2px;
}

.page-about .about-topics .topic-card__more:hover {
  border-bottom-color: var(--cyan-400);
}

/* 链接按钮组 */
.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-section--next {
  position: relative;
}

.page-about .about-section--next::after {
  content: "";
  display: block;
  height: 4px;
  width: clamp(80px, 22vw, 160px);
  margin-top: 32px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--track-600), var(--cyan-400));
}

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-duo {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-duo .about-figure {
    margin-top: 0;
  }

  .page-about .version-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-topics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-section--timeline .about-figure--square {
    margin-top: 28px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--bar-h) + 24px);
    padding-left: 18px;
    align-self: start;
  }

  .page-about .about-rail::before {
    content: "";
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--cyan-400), rgba(53, 231, 224, 0.08) 82%, transparent);
  }

  .page-about .about-rail__title {
    margin: 0 0 14px;
    color: var(--text-300);
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0 9px 2px;
    position: relative;
    font-size: 13px;
    line-height: 1.4;
    color: var(--text-300);
    text-decoration: none;
    transition: color 0.18s ease;
  }

  .page-about .about-rail__link .mono {
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--track-400);
  }

  .page-about .about-rail__link::after {
    content: "";
    position: absolute;
    left: -21px;
    top: 16px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ink-700);
    transition: background 0.18s ease, box-shadow 0.18s ease;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--text-100);
  }

  .page-about .about-rail__link:hover::after,
  .page-about .about-rail__link:focus-visible::after {
    background: var(--track-400);
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
  }

  .page-about .about-rail__note {
    margin: 26px 0 0;
    font-size: 11px;
    line-height: 1.8;
    letter-spacing: 0.08em;
    color: var(--text-300);
  }

  .page-about .about-rail__note .mono {
    color: var(--cyan-400);
    font-size: 11px;
  }

  .page-about .about-section {
    padding-block: clamp(40px, 4.4vw, 76px);
  }

  .page-about .about-copy {
    max-width: 38em;
  }

  .page-about .about-section__title {
    max-width: 26ch;
  }
}

@media (min-width: 1280px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .page-about .role-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .version-node,
  .page-about .about-rail__link,
  .page-about .about-rail__link::after {
    transition: none;
  }
}
<<<END>>>