.page-about {
  --about-rail: 88px;
  --about-dot: 8px;
  --about-line: 1px solid var(--line-700);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(28px, 5.5vw, 64px) 0 clamp(24px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 40px);
  align-items: end;
}

.page-about .about-hero__title {
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--white-100);
  margin: 12px 0 20px;
  max-width: 15em;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: var(--measure);
  color: var(--silver-200);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-hero__panel {
  border: 1px solid var(--line-700);
  background: var(--ink-800);
  padding: 4px 20px 8px;
}

.page-about .about-hero__panel-title {
  margin: 0;
  padding: 16px 0 12px;
  border-bottom: 1px solid var(--line-700);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--silver-500);
}

.page-about .about-hero__list {
  margin: 0;
  padding: 0;
}

.page-about .about-hero__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-700);
}

.page-about .about-hero__item:last-child {
  border-bottom: 0;
}

.page-about .about-hero__item dt {
  font-size: 14px;
  color: var(--silver-500);
}

.page-about .about-hero__item dd {
  margin: 0;
  font-size: 15px;
  color: var(--silver-200);
}

.page-about .about-hero__item .num {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 700;
  color: var(--green-300);
  letter-spacing: -0.01em;
}

/* ---------- 通栏视觉 ---------- */

.page-about .about-visual {
  margin: 0 0 clamp(32px, 5vw, 56px);
}

.page-about .about-visual .figure__media,
.page-about .together-figure .figure__media {
  overflow: hidden;
  border: 1px solid var(--line-700);
}

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

/* ---------- 长文骨架 ---------- */

.page-about .story {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  padding-bottom: clamp(40px, 6vw, 80px);
}

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

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

.page-about .story__section {
  padding: clamp(28px, 4.5vw, 52px) 0;
  border-top: var(--about-line);
}

.page-about .story__section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .story__title {
  margin: 10px 0 18px;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.26;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white-100);
  max-width: 18em;
}

.page-about .story__lede {
  margin: 0 0 26px;
  max-width: var(--measure);
  color: var(--silver-200);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .story__quote {
  margin: 0 0 24px;
  max-width: 24em;
  font-size: clamp(19px, 2.9vw, 28px);
  line-height: 1.45;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--green-300);
}

.page-about .prose p {
  margin: 0 0 1.2em;
  max-width: var(--measure);
  color: var(--silver-200);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 章节刻度 ---------- */

.page-about .rail {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: var(--about-line);
}

.page-about .rail__item {
  margin: 0;
}

.page-about .rail__tick {
  display: block;
  margin-left: -1px;
  padding: 9px 0 9px 13px;
  border-left: 2px solid transparent;
  text-decoration: none;
  color: var(--silver-500);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .rail__tick:hover {
  color: var(--silver-200);
}

.page-about .rail__tick[data-active] {
  color: var(--green-500);
  border-left-color: var(--green-500);
}

.page-about .rail__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .rail__label {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  opacity: 0.9;
}

/* ---------- 时间轴 ---------- */

.page-about .tl {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  border-left: var(--about-line);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 22px 0 22px 24px;
  border-bottom: 1px solid var(--line-700);
}

.page-about .tl__item:last-child {
  border-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 30px;
  width: var(--about-dot);
  height: var(--about-dot);
  background: var(--line-700);
  transition: background var(--ease);
}

.page-about .tl__item:hover::before {
  background: var(--green-500);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--green-500);
}

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

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white-100);
}

.page-about .tl__text {
  margin: 0 0 10px;
  max-width: var(--measure);
  color: var(--silver-200);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .tl__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .tl__points li {
  position: relative;
  padding-left: 16px;
  color: var(--silver-500);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .tl__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--green-500);
  opacity: 0.75;
}

/* ---------- 团队 ---------- */

.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .team-layout__figure {
  margin: 0;
}

.page-about .team-layout__figure .figure__media {
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--line-700);
  background: var(--ink-800);
}

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

.page-about .team {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 22px 16px;
  margin: 0 -16px;
  border-top: 1px solid var(--line-700);
  transition: background var(--ease);
}

.page-about .team__row:last-child {
  border-bottom: 1px solid var(--line-700);
}

.page-about .team__row:hover,
.page-about .team__row:focus-within {
  background: var(--steel-700);
}

.page-about .team__index {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--green-500);
}

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

.page-about .team__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white-100);
}

.page-about .team__text {
  margin: 0;
  max-width: var(--measure);
  color: var(--silver-200);
  font-size: 15px;
  line-height: 1.82;
}

/* ---------- 覆盖范围 ---------- */

.page-about .coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-700);
  border: 1px solid var(--line-700);
}

.page-about .coverage__col {
  padding: 22px 20px 26px;
}

.page-about .coverage__col--green {
  background: var(--green-900);
}

.page-about .coverage__col--ink {
  background: var(--ink-800);
}

.page-about .coverage__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-700);
}

.page-about .coverage__count {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--green-500);
  letter-spacing: -0.02em;
}

.page-about .coverage__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--white-100);
}

.page-about .coverage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .coverage__list li {
  position: relative;
  padding-left: 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver-200);
}

.page-about .coverage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 6px;
  height: 1px;
  background: var(--silver-500);
}

.page-about .coverage__sum {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-700);
  max-width: var(--measure);
  color: var(--silver-500);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 两条时间跨度 ---------- */

.page-about .spans {
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--line-700);
}

.page-about .spans__col {
  padding: 24px 20px 28px;
}

.page-about .spans__col + .spans__col {
  border-top: 1px solid var(--line-700);
}

.page-about .spans__tag {
  display: inline-block;
  margin: 0 0 14px;
  padding: 3px 9px;
  border: 1px solid var(--green-500);
  color: var(--green-500);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.6;
}

.page-about .spans__col:last-child .spans__tag {
  border-color: var(--amber-500);
  color: var(--amber-500);
}

.page-about .spans__head {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--white-100);
  line-height: 1.4;
}

.page-about .spans__text {
  margin: 0;
  color: var(--silver-200);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .spans__note {
  margin: 22px 0 0;
  max-width: var(--measure);
  padding-left: 16px;
  border-left: 2px solid var(--green-500);
  color: var(--silver-500);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 协作 ---------- */

.page-about .together-figure {
  margin: 28px 0 0;
}

.page-about .paths {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line-700);
}

.page-about .paths__note {
  flex-basis: 100%;
  margin: 0;
  color: var(--silver-500);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .paths__note a {
  color: var(--silver-200);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--line-700);
  transition: color var(--ease), text-decoration-color var(--ease);
}

.page-about .paths__note a:hover {
  color: var(--green-500);
  text-decoration-color: var(--green-500);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .tl__item {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 28px;
    padding: 26px 0 26px 32px;
  }

  .page-about .tl__item::before {
    top: 32px;
  }

  .page-about .tl__year {
    font-size: 19px;
  }

  .page-about .team__row {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 24px;
    padding: 26px 20px;
    margin: 0 -20px;
  }

  .page-about .team__index {
    font-size: 40px;
  }

  .page-about .coverage {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .spans {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .spans__col + .spans__col {
    border-top: 0;
    border-left: 1px solid var(--line-700);
  }

  .page-about .coverage__col {
    padding: 26px 24px 30px;
  }

  .page-about .spans__col {
    padding: 28px 24px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .story {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .story__rail {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (hover: hover) and (pointer: fine) and (min-width: 900px) {
  .page-about .tl__points {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--ease), margin-top var(--ease), opacity var(--ease);
  }

  .page-about .tl__item:hover .tl__points,
  .page-about .tl__item:focus-within .tl__points {
    max-height: 300px;
    margin-top: 12px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__points {
    max-height: none !important;
    opacity: 1 !important;
    margin-top: 12px !important;
  }

  .page-about .rail__tick,
  .page-about .team__row,
  .page-about .tl__item::before {
    transition: none;
  }
}
<<<END>>>