.page-about {
  --about-rule: rgba(159, 176, 173, 0.3);
  --about-year-col: 260px;
  --about-rail-gap: 48px;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-crumb-bar {
  padding-top: 12px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-areas:
    "eyebrow"
    "title"
    "aside";
  gap: 24px;
}

.page-about .about-hero__eyebrow {
  grid-area: eyebrow;
  margin: 0;
  color: var(--lime);
}

.page-about .about-hero__title {
  grid-area: title;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 9vw, 96px);
  line-height: 1.02;
  letter-spacing: 0.05em;
  color: var(--paper-100);
  max-width: 15ch;
}

.page-about .about-hero__aside {
  grid-area: aside;
}

.page-about .about-hero__lede {
  margin: 0;
  color: var(--silver-light);
  max-width: 46ch;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  margin: 28px 0 0;
}

.page-about .about-facts__item {
  border-top: var(--hairline-strong);
  padding-top: 10px;
  min-width: 0;
}

.page-about .about-facts dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

.page-about .about-facts dd {
  margin: 6px 0 0;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.02em;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 2px;
  background: var(--ink-800);
}

/* ---------- 年份索引 ---------- */
.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 16px;
  padding-bottom: 16px;
  border-top: var(--hairline);
  border-bottom: var(--hairline);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__label {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--silver);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: block;
  padding: 5px 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--silver-light);
  text-decoration: none;
  border: var(--hairline);
  border-radius: 999px;
  transition: color 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---------- 通用小节 ---------- */
.page-about .about-section-lede {
  margin: 14px 0 0;
  max-width: 54ch;
  color: var(--silver);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-figure-cap {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .about-chip {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--silver);
  border: var(--hairline);
  border-radius: 999px;
  white-space: nowrap;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__title {
  margin-top: 10px;
  color: var(--paper-100);
}

.page-about .tl {
  position: relative;
  margin: clamp(36px, 6vw, 64px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(44px, 7vw, 76px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 6px;
  width: 1px;
  background: var(--about-rule);
}

.page-about .tl__item {
  position: relative;
  padding-left: 34px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px var(--ink-900);
}

.page-about .tl__year {
  font-size: clamp(44px, 11vw, 64px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper-200);
}

.page-about .tl__body {
  margin-top: 14px;
  min-width: 0;
}

.page-about .tl__kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .tl__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--paper-100);
}

.page-about .tl__text {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver-light);
}

.page-about .tl__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__item--key .tl__body {
  background: var(--paper-100);
  color: var(--brown);
  padding: clamp(20px, 3vw, 30px);
  border-radius: 2px;
  box-shadow: 0 14px 0 -6px var(--paper-200);
}

.page-about .tl__item--key .tl__title {
  color: var(--brown);
}

.page-about .tl__item--key .tl__text {
  color: #463a31;
}

.page-about .tl__item--key .about-chip {
  color: #5d4d41;
  border-color: rgba(42, 33, 27, 0.28);
}

/* ---------- 版本切换 ---------- */
.page-about .about-versions__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .ver-switch {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .ver-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-about .ver-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: var(--hairline);
}

.page-about .ver-tab {
  display: inline-block;
  padding: 9px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--silver);
  border: var(--hairline);
  border-radius: 999px;
  cursor: pointer;
  transition: color 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ver-tab:hover {
  color: var(--paper-100);
  border-color: var(--silver-light);
}

.page-about .ver-panels {
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .ver-panel {
  display: none;
}

.page-about .ver-panel__meta {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .ver-panel__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--paper-100);
}

.page-about .ver-panel__text {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver-light);
}

.page-about .ver-panel__list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ver-panel__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--silver-light);
}

.page-about .ver-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
}

.page-about .ver-panel__link {
  display: inline-block;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 43, 0.5);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ver-panel__link:hover,
.page-about .ver-panel__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about #about-ver-1:checked ~ .ver-tabs .ver-tab[for="about-ver-1"],
.page-about #about-ver-2:checked ~ .ver-tabs .ver-tab[for="about-ver-2"],
.page-about #about-ver-3:checked ~ .ver-tabs .ver-tab[for="about-ver-3"] {
  color: var(--ink-900);
  background: var(--orange);
  border-color: var(--orange);
}

.page-about #about-ver-1:checked ~ .ver-panels .ver-panel--1,
.page-about #about-ver-2:checked ~ .ver-panels .ver-panel--2,
.page-about #about-ver-3:checked ~ .ver-panels .ver-panel--3 {
  display: block;
}

.page-about #about-ver-1:focus-visible ~ .ver-tabs .ver-tab[for="about-ver-1"],
.page-about #about-ver-2:focus-visible ~ .ver-tabs .ver-tab[for="about-ver-2"],
.page-about #about-ver-3:focus-visible ~ .ver-tabs .ver-tab[for="about-ver-3"] {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

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

.page-about .about-versions__figure img,
.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 2px;
  object-fit: cover;
  background: var(--ink-800);
}

.page-about .about-versions__figure img {
  aspect-ratio: 4 / 3;
}

/* ---------- 三组分工 ---------- */
.page-about .teams {
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .teams__row {
  display: grid;
  gap: 14px;
  padding: clamp(24px, 3.4vw, 34px) 0;
  border-top: var(--hairline);
}

.page-about .teams__row:last-child {
  border-bottom: var(--hairline);
}

.page-about .teams__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .teams__no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .teams__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.8vw, 24px);
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--paper-100);
}

.page-about .teams__body p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver-light);
}

.page-about .teams__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(198, 242, 78, 0.45);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .teams__link:hover,
.page-about .teams__link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach__paper {
  background: var(--paper-100);
  color: var(--brown);
  padding: clamp(24px, 5vw, 60px);
  border-radius: 2px;
  box-shadow: 0 20px 0 -10px var(--paper-200);
}

.page-about .about-reach__eyebrow {
  margin: 0 0 10px;
  color: #8a6f52;
}

.page-about .about-reach__paper .section-title {
  margin: 0;
  color: var(--brown);
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-reach__text p {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: #463a31;
}

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

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  margin: 0;
  align-content: start;
}

.page-about .about-reach__stats > div {
  border-top: 1px solid rgba(42, 33, 27, 0.24);
  padding-top: 10px;
  min-width: 0;
}

.page-about .about-reach__stats dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: #6d5b4c;
}

.page-about .about-reach__stats dd {
  margin: 6px 0 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--brown);
  letter-spacing: 0.01em;
}

/* ---------- 协作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-partners__text p {
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--silver-light);
}

.page-about .about-partners__list {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: var(--hairline);
  font-size: 15px;
  line-height: 1.6;
  color: var(--silver-light);
}

.page-about .about-partners__list li .mono {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-partners__figure {
  margin: 0;
  align-self: start;
}

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

/* ---------- 结尾入口 ---------- */
.page-about .about-next__links {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-tile {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 160px;
  text-decoration: none;
}

.page-about .about-tile__label {
  display: block;
  margin-bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  opacity: 0.72;
}

.page-about .about-tile__title {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 24px);
  font-weight: 900;
  letter-spacing: 0.03em;
  line-height: 1.3;
}

.page-about .about-tile:hover .about-tile__title,
.page-about .about-tile:focus-visible .about-tile__title {
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next__links {
    grid-template-columns: 1.35fr 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-areas:
      "eyebrow eyebrow"
      "title aside";
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 20px clamp(40px, 5vw, 72px);
    align-items: end;
  }

  .page-about .about-hero__title {
    max-width: 13ch;
  }

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

  .page-about .tl {
    gap: clamp(72px, 8vw, 104px);
  }

  .page-about .tl::before {
    left: calc(var(--about-year-col) + (var(--about-rail-gap) / 2));
  }

  .page-about .tl__item {
    display: grid;
    grid-template-columns: var(--about-year-col) minmax(0, 1fr);
    gap: var(--about-rail-gap);
    padding-left: 0;
    align-items: start;
  }

  .page-about .tl__item::before {
    left: calc(var(--about-year-col) + (var(--about-rail-gap) / 2) - 7px);
    top: 16px;
  }

  .page-about .tl__year {
    font-size: 96px;
    text-align: right;
    letter-spacing: -0.02em;
  }

  .page-about .tl__body {
    margin-top: 0;
  }

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

  .page-about .teams__row {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

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

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .ver-tab,
  .page-about .ver-panel__link,
  .page-about .teams__link {
    transition: none;
  }
}
<<<END>>>