.page-about {
  --about-gutter: clamp(20px, 5vw, 56px);
  --about-gap: clamp(18px, 3vw, 36px);
  background: var(--ink-900);
  color: var(--text-hi);
  overflow-x: clip;
}

.page-about .breadcrumbs {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 18px var(--about-gutter) 0;
}

.page-about a {
  color: var(--cyan-400);
}

.page-about .lede {
  max-width: 38em;
  margin: 0;
  color: var(--text-lo);
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
}

.page-about .body-copy {
  max-width: 38em;
  margin: 0;
  color: var(--text-hi);
  font-size: 17px;
  line-height: 1.85;
}

.page-about .body-copy + .body-copy {
  margin-top: 1em;
}

.page-about .eyebrow {
  margin: 0 0 10px;
  color: var(--cyan-400);
}

/* 首屏 */
.about-hero {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(36px, 7vw, 96px) var(--about-gutter) clamp(28px, 5vw, 56px);
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  border-bottom: 1px solid var(--ink-700);
}

.about-hero__title {
  margin: 0.12em 0 0.28em;
  font-family: var(--font-sans);
  font-size: clamp(44px, 9.5vw, 112px);
  font-weight: 900;
  line-height: 0.96;
  letter-spacing: -0.035em;
  animation: about-rise 0.7s var(--ease-out) both;
}

.about-hero__lede {
  animation: about-rise 0.7s var(--ease-out) 0.1s both;
}

.about-hero__aside {
  align-self: end;
  padding-left: 18px;
  border-left: 2px solid var(--cyan-400);
  color: var(--text-lo);
  font-size: 14px;
  line-height: 1.75;
  animation: about-rise 0.7s var(--ease-out) 0.18s both;
}

.about-hero__aside p {
  margin: 0 0 12px;
}

.about-hero__stamp {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber-400) !important;
}

.about-hero__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-underline-offset: 0.28em;
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 数据带 */
.about-stats {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--about-gutter);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
  border-bottom: 1px solid var(--ink-700);
}

.about-stats__item {
  padding: 18px 0;
  border-top: 1px solid var(--ink-700);
}

.about-stats__item:nth-child(odd) {
  padding-right: 16px;
}

.about-stats__item:nth-child(even) {
  padding-left: 16px;
  border-left: 1px solid var(--ink-700);
}

.about-stats__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--paper-100);
}

.about-stats__label {
  display: block;
  margin-top: 8px;
  color: var(--text-lo);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* 章节骨架 */
.about-section {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(46px, 8vw, 92px) var(--about-gutter);
  display: grid;
  gap: 12px;
}

.about-section__index {
  align-self: start;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 72px);
  line-height: 0.9;
  letter-spacing: -0.06em;
  color: var(--text-lo);
  opacity: 0.42;
}

.about-section__body {
  min-width: 0;
}

.about-section__title {
  margin: 0 0 0.45em;
  font-size: clamp(28px, 4.2vw, 48px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.about-section--paper {
  max-width: var(--content-max);
  margin: clamp(22px, 4vw, 40px) auto;
  padding: clamp(28px, 5vw, 64px) var(--about-gutter);
  background: var(--paper-100);
  color: var(--ink-900);
  border-radius: clamp(20px, 3vw, 32px);
}

.about-section--paper .about-section__index {
  color: var(--ink-700);
  opacity: 0.55;
}

.about-section--paper .eyebrow {
  color: var(--teal-600);
}

.about-section--paper .lede {
  color: var(--ink-800);
}

.about-section--paper .body-copy {
  color: var(--ink-900);
}

.about-section--paper a {
  color: var(--teal-600);
}

/* 版本追踪流程 */
.about-flow {
  display: grid;
  margin-top: clamp(24px, 4vw, 36px);
}

.about-flow__step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 0;
  border-top: 1px solid var(--ink-700);
}

.about-flow__num {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber-400);
}

.about-flow__title {
  margin: 0;
  font-size: 19px;
  line-height: 1.4;
}

.about-flow__text {
  grid-column: 2;
  margin: 0;
  color: var(--text-lo);
  font-size: 15.5px;
  line-height: 1.8;
}

.about-note {
  max-width: 34em;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--cyan-400);
  color: var(--text-hi);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.65;
}

.about-section--paper .about-note {
  border-left-color: var(--teal-600);
  color: var(--ink-900);
}

/* 团队 */
.about-team__figure {
  margin: clamp(22px, 4vw, 36px) 0;
}

.about-team__figure img,
.about-lab__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  object-fit: cover;
}

.about-team {
  border-bottom: 1px solid var(--paper-300);
}

.about-team__item {
  border-top: 1px solid var(--paper-300);
}

.about-team__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.about-team__summary::-webkit-details-marker {
  display: none;
}

.about-team__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 400;
  color: var(--teal-600);
}

.about-team__item[open] .about-team__summary::after {
  content: "−";
}

.about-team__role {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--teal-600);
}

.about-team__body {
  padding: 0 0 20px;
  color: var(--ink-800);
  font-size: 16px;
  line-height: 1.85;
}

.about-team__body p {
  max-width: 40em;
  margin: 0;
}

.about-team__body p + p {
  margin-top: 0.8em;
}

.about-team__meta {
  margin: clamp(22px, 4vw, 32px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--paper-300);
  color: var(--ink-700);
  font-size: 14px;
  line-height: 1.8;
}

/* 实验室 */
.about-lab {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(24px, 4vw, 36px);
}

.about-lab__figure {
  margin: 0;
}

.about-lab__params {
  margin: 24px 0 0;
}

.about-lab__params div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-top: 1px solid var(--ink-700);
}

.about-lab__params dt {
  color: var(--text-lo);
  font-size: 13px;
}

.about-lab__params dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  text-align: right;
  color: var(--cyan-400);
}

/* 时间线 */
.about-timeline {
  position: relative;
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(18px, 4vw, 38px);
  overflow: hidden;
  background: linear-gradient(135deg, var(--ink-800), var(--ink-900) 70%);
  border: 1px solid var(--ink-700);
  border-radius: 26px;
}

.about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.16;
  pointer-events: none;
}

.about-timeline__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-timeline__axis {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 26px;
  color: var(--ink-700);
}

.about-timeline__track {
  position: relative;
  z-index: 1;
  display: flex;
  gap: var(--about-gap);
  margin: 0;
  padding: 10px 4px 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-700) transparent;
}

.tl-node {
  position: relative;
  flex: 0 0 min(268px, 78vw);
  padding: 22px 0 0;
  border-top: 1px solid var(--ink-700);
  scroll-snap-align: start;
  outline: none;
}

.tl-node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(55, 230, 208, 0.12);
  transition: transform 0.25s var(--ease-out);
}

.tl-node:hover::before,
.tl-node:focus-within::before {
  transform: scale(1.45);
}

.tl-node:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 8px;
  border-radius: 4px;
}

.tl-node__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber-400);
}

.tl-node__title {
  margin: 0 0 8px;
  font-size: 21px;
  line-height: 1.35;
}

.tl-node__summary {
  margin: 0;
  color: var(--text-lo);
  font-size: 14.5px;
  line-height: 1.75;
}

.tl-node__more {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--text-hi);
  font-size: 14px;
  line-height: 1.75;
  transition: max-height 0.35s var(--ease-out), opacity 0.3s var(--ease-out), margin 0.3s var(--ease-out);
}

.tl-node:hover .tl-node__more,
.tl-node:focus-within .tl-node__more {
  max-height: 190px;
  margin-top: 12px;
  opacity: 1;
}

/* 维护原则 */
.about-principles {
  display: grid;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.about-principle {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 3px 18px;
  padding: 18px 0;
  border-top: 1px solid var(--paper-300);
}

.about-principle__num {
  grid-row: span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--teal-600);
}

.about-principle__title {
  margin: 0;
  font-size: 18px;
  line-height: 1.45;
  color: var(--ink-900);
}

.about-principle__text {
  grid-column: 2;
  margin: 0;
  max-width: 40em;
  color: var(--ink-800);
  font-size: 15.5px;
  line-height: 1.82;
}

/* 协作 */
.about-partners {
  margin-top: clamp(24px, 4vw, 36px);
}

.about-partners__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.about-partners__item {
  padding: 15px 0;
  border-top: 1px solid var(--ink-700);
}

.about-partners__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  color: var(--paper-100);
}

.about-partners__label {
  display: block;
  margin-top: 6px;
  color: var(--text-lo);
  font-size: 12.5px;
  letter-spacing: 0.04em;
}

/* 行动区 */
.about-cta {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(24px, 4vw, 40px);
  background:
    linear-gradient(120deg, rgba(55, 230, 208, 0.09), transparent 58%),
    var(--ink-800);
  border: 1px solid var(--ink-700);
  border-radius: 24px;
}

.about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1.25;
}

.about-cta p {
  max-width: 40em;
  margin: 0;
  color: var(--text-lo);
  font-size: 15px;
  line-height: 1.8;
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.about-cta__links {
  margin-top: 18px !important;
  font-size: 14px !important;
}

.about-cta__links a {
  color: var(--cyan-400);
}

/* 响应式 */
@media (min-width: 720px) {
  .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .about-stats__item,
  .about-stats__item:nth-child(odd),
  .about-stats__item:nth-child(even) {
    padding: 20px 18px;
    border-left: 1px solid var(--ink-700);
  }

  .about-stats__item:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

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

@media (min-width: 900px) {
  .about-hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(230px, 0.65fr);
    align-items: end;
  }

  .about-section {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: clamp(24px, 5vw, 72px);
  }

  .about-section__index {
    position: sticky;
    top: 28px;
  }

  .about-lab {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (hover: none) {
  .tl-node__more {
    max-height: none;
    margin-top: 12px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-hero__title,
  .about-hero__lede,
  .about-hero__aside {
    animation: none;
  }

  .tl-node::before,
  .tl-node__more {
    transition: none;
  }
}
<<<END>>>