.page-about {
  --about-rail: 200px;
  --about-gap: 40px;
  padding-top: 76px;
  overflow-x: hidden;
}

.page-about .about-crumbs {
  padding-bottom: 20px;
}

.page-about .about-crumbs a {
  color: var(--grey);
  text-decoration: none;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 8px 0 56px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -40px -10% 30% 42%;
  background:
    radial-gradient(60% 70% at 70% 20%, var(--cyan-soft), transparent 70%),
    radial-gradient(50% 60% at 30% 90%, var(--orange-soft), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: var(--fs-h1);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 20ch;
}

.page-about .about-hero .lede {
  margin: 0 0 24px;
  max-width: 60ch;
  color: var(--grey);
  font-size: 1.0625rem;
  line-height: 1.8;
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-size: 0.9rem;
  color: var(--grey);
}

.page-about .about-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-hero__meta .mono {
  color: var(--orange);
  font-weight: 700;
  font-size: 1rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-organic);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  padding-top: 8px;
  padding-bottom: 72px;
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-rail {
  position: static;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--rock);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  border-radius: var(--r-soft);
  color: var(--grey);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-rail__list .mono {
  font-size: 0.72rem;
  color: var(--rock);
  letter-spacing: 0.08em;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--white);
  background: var(--cyan-soft);
}

.page-about .about-rail__list a:hover .mono,
.page-about .about-rail__list a:focus-visible .mono {
  color: var(--cyan);
}

.page-about .about-canvas {
  display: flex;
  flex-direction: column;
  gap: 76px;
  min-width: 0;
}

/* ---------- 章节头部 ---------- */

.page-about .about-section__head {
  margin-bottom: 28px;
}

.page-about .about-section__index {
  margin: 0 0 12px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-section h2 {
  margin: 0 0 14px;
  font-size: var(--fs-h2);
  line-height: 1.22;
  font-weight: 800;
  color: var(--white);
  max-width: 24ch;
}

.page-about .about-section__lede {
  margin: 0;
  max-width: 62ch;
  color: var(--grey);
  line-height: 1.8;
}

/* ---------- 01 起点 ---------- */

.page-about .about-origin {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .about-origin__text p {
  margin: 0 0 18px;
  color: var(--grey);
  line-height: 1.85;
}

.page-about .about-origin__text p:first-child {
  color: var(--white);
  font-size: 1.0625rem;
}

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

.page-about .about-dossier {
  border-top: 2px solid var(--moss);
  background: var(--ink-2);
  padding: 22px 20px 18px;
  border-radius: 0 0 var(--r-soft) var(--r-soft);
}

.page-about .about-dossier__title {
  margin: 0 0 16px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--moss);
}

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

.page-about .about-dossier__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-dossier__row dt {
  color: var(--grey);
  font-size: 0.875rem;
}

.page-about .about-dossier__row dd {
  margin: 0;
  color: var(--cyan);
  font-weight: 700;
  font-size: 0.9rem;
  white-space: nowrap;
}

/* ---------- 02 版本时间轴 ---------- */

.page-about .about-timeline__figure {
  margin: 0 0 34px;
  border: 1px solid var(--line);
  border-radius: var(--r-soft);
  overflow: hidden;
  background: var(--ink-3);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 1;
  object-fit: cover;
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 22px 4px 22px 22px;
  border-bottom: 1px solid var(--line-soft);
  transition: background-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-tl__item::after {
  content: "";
  position: absolute;
  left: -4px;
  top: 28px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--moss);
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-tl__item--clay::after {
  border-color: var(--clay);
}

.page-about .about-tl__item:hover,
.page-about .about-tl__item:focus-visible {
  background: rgba(0, 229, 255, 0.04);
  transform: translateY(-2px);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-visible::before {
  background: var(--cyan);
}

.page-about .about-tl__item:hover::after,
.page-about .about-tl__item:focus-visible::after {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

.page-about .about-tl__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-tl__ver {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  font-weight: 700;
}

.page-about .about-tl__era {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-tl__body p {
  margin: 0;
  color: var(--grey);
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ---------- 03 覆盖 ---------- */

.page-about .about-coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.page-about .about-table thead th {
  text-align: left;
  padding: 0 10px 12px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--rock);
  font-weight: 400;
}

.page-about .about-table tbody th,
.page-about .about-table tbody td {
  padding: 14px 10px;
  border-bottom: 1px solid var(--line-soft);
  font-weight: 400;
  text-align: left;
  vertical-align: baseline;
}

.page-about .about-table tbody th {
  color: var(--grey);
}

.page-about .about-table tbody tr {
  transition: background-color 0.18s var(--ease);
}

.page-about .about-table tbody tr:hover {
  background: rgba(0, 229, 255, 0.05);
}

.page-about .about-table__val {
  font-family: var(--font-mono);
  color: var(--orange);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-coverage__side p {
  margin: 0 0 16px;
  color: var(--grey);
  font-size: 0.9375rem;
  line-height: 1.85;
}

.page-about .about-coverage__link {
  margin-top: 22px;
}

.page-about .about-coverage__link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  padding-bottom: 2px;
}

.page-about .about-coverage__link a:hover,
.page-about .about-coverage__link a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 04 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
  margin-bottom: 34px;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-soft);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__text p {
  margin: 0 0 16px;
  color: var(--grey);
  line-height: 1.85;
}

.page-about .about-team__text p:first-child {
  color: var(--white);
}

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

.page-about .about-crews {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-crews__item {
  background: var(--ink);
  padding: 20px 18px 22px;
  transition: background-color 0.18s var(--ease);
}

.page-about .about-crews__item:hover {
  background: var(--ink-2);
}

.page-about .about-crews__name {
  margin: 0 0 10px;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .about-crews__item:nth-child(2) .about-crews__name {
  color: var(--moss);
}

.page-about .about-crews__item:nth-child(3) .about-crews__name {
  color: var(--cyan);
}

.page-about .about-crews__item:nth-child(4) .about-crews__name {
  color: var(--orange);
}

.page-about .about-crews__item h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  color: var(--white);
  font-weight: 700;
}

.page-about .about-crews__item p:last-child {
  margin: 0;
  color: var(--grey);
  font-size: 0.9rem;
  line-height: 1.75;
}

/* ---------- 05 回访 ---------- */

.page-about .about-why {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 26px;
}

.page-about .about-why__item {
  background: var(--ink);
  padding: 24px 20px 26px;
  position: relative;
  transition: background-color 0.18s var(--ease);
}

.page-about .about-why__item:hover {
  background: var(--ink-2);
}

.page-about .about-why__num {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-why__item h3 {
  margin: 0 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-why__item p:last-child {
  margin: 0;
  color: var(--grey);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-about .about-why__more {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  color: var(--grey);
  line-height: 1.85;
  font-size: 0.9375rem;
}

.page-about .about-why__more a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.35);
}

.page-about .about-why__more a:hover,
.page-about .about-why__more a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  border-top: 1px solid var(--line);
  background: var(--ink-2);
  padding: 52px 0 60px;
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
}

.page-about .about-cta__copy h2 {
  margin: 0 0 12px;
  font-size: var(--fs-h2);
  font-weight: 800;
  color: var(--white);
  line-height: 1.22;
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 56ch;
  color: var(--grey);
  line-height: 1.8;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 40px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-hero {
    padding: 16px 0 76px;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.4fr) minmax(240px, 1fr);
    gap: 44px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 40px;
  }

  .page-about .about-tl__item {
    grid-template-columns: 84px 96px minmax(0, 1fr);
    align-items: start;
    gap: 0 24px;
    padding: 26px 20px 26px 24px;
  }

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

  .page-about .about-tl__ver {
    padding-top: 3px;
  }

  .page-about .about-tl__era {
    padding-top: 5px;
  }
}

@media (min-width: 1080px) {
  .page-about {
    padding-top: 32px;
  }

  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 32px;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 20px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-rail__list a {
    width: 100%;
  }

  .page-about .about-section h2 {
    max-width: 26ch;
  }
}

@media (min-width: 1320px) {
  .page-about .about-hero__inner {
    gap: 72px;
  }

  .page-about .about-canvas {
    gap: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-tl__item::before,
  .page-about .about-tl__item::after,
  .page-about .about-rail__list a,
  .page-about .about-table tbody tr,
  .page-about .about-crews__item,
  .page-about .about-why__item {
    transition: none;
  }

  .page-about .about-tl__item:hover,
  .page-about .about-tl__item:focus-visible {
    transform: none;
  }
}
<<<END>>>