.page-about {
  --about-rail-w: 180px;
  --about-sticky-top: calc(var(--header-h) + 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: calc(var(--header-h) + 56px) 72px;
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(63, 224, 207, 0.14), transparent 62%),
    radial-gradient(90% 70% at 4% 92%, rgba(255, 138, 61, 0.12), transparent 60%),
    var(--ink-900);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(154, 174, 194, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(154, 174, 194, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 32%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 32%, transparent 78%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

.page-about .about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-left: 16px;
  border-left: 2px solid rgba(63, 224, 207, 0.42);
}

.page-about .about-hero__mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate-300);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--slate-300);
}

.page-about .breadcrumb__list li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--teal-700);
}

.page-about .breadcrumb__list a {
  color: var(--cyan-400);
  text-decoration: none;
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  text-decoration: underline;
}

.page-about .about-hero__title {
  margin: 0 0 26px;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 0.98;
}

.page-about .about-hero__title-top {
  display: block;
  font-size: clamp(2.6rem, 9vw, 5.5rem);
  color: var(--paper-100);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.page-about .about-hero__title-bottom {
  display: block;
  margin-top: 6px;
  font-size: clamp(1.35rem, 4.2vw, 2.3rem);
  line-height: 1.3;
  color: var(--cyan-400);
}

.page-about .about-hero__lede {
  max-width: 38ch;
  margin: 0 0 32px;
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-hero__lede a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px dashed rgba(63, 224, 207, 0.55);
}

.page-about .about-hero__lede a:hover,
.page-about .about-hero__lede a:focus-visible {
  border-bottom-style: solid;
  border-bottom-color: var(--orange-500);
  color: var(--orange-500);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.page-about .about-hero__stat {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(19, 46, 74, 0.82);
  border: 1px solid rgba(154, 174, 194, 0.16);
}

.page-about .about-hero__stat dt {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate-300);
}

.page-about .about-hero__stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--paper-100);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  background: var(--ink-900);
}

.page-about .about-history__figure {
  margin: 0 0 56px;
}

.page-about .about-history__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(63, 224, 207, 0.16);
  background: var(--ink-800);
}

.page-about .about-history__figure figcaption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate-300);
}

.page-about .about-history__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

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

.page-about .about-history__rail-label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate-300);
}

.page-about .about-history__year-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-history__year-list a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-body);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-history__year-list a:hover,
.page-about .about-history__year-list a:focus-visible {
  background: var(--ink-700);
  border-left-color: var(--orange-500);
  color: var(--paper-100);
}

.page-about .about-history__rail-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--slate-300);
}

.page-about .about-history__events {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-history__events::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 7px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-400), rgba(63, 224, 207, 0.08));
}

.page-about .about-history__event {
  position: relative;
  padding-bottom: 32px;
}

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

.page-about .about-history__marker {
  position: absolute;
  top: 8px;
  left: -26px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan-400);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-history__event:hover .about-history__marker,
.page-about .about-history__event:target .about-history__marker {
  background: var(--orange-500);
  border-color: var(--orange-500);
  transform: scale(1.15);
}

.page-about .about-history__year {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2rem);
  letter-spacing: 0.02em;
  color: var(--amber-400);
}

.page-about .about-history__body h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--paper-100);
}

.page-about .about-history__body p {
  max-width: 42ch;
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--text-body);
}

/* ---------- 栏目体系 ---------- */
.page-about .about-cats__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

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

.page-about .about-cats__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(155, 212, 188, 0.24);
  background: var(--ink-800);
}

.page-about .about-cats__figure figcaption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate-300);
}

.page-about .about-cats__tree {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cats__node {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  background: rgba(19, 46, 74, 0.62);
  border: 1px solid rgba(154, 174, 194, 0.16);
  transition: border-color 0.22s ease, transform 0.22s ease, background 0.22s ease;
}

.page-about .about-cats__node:hover,
.page-about .about-cats__node:focus-within {
  border-color: var(--cyan-400);
  background: rgba(23, 86, 94, 0.42);
  transform: translateY(-2px);
}

.page-about .about-cats__num {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan-400);
  padding-top: 2px;
}

.page-about .about-cats__text h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--paper-100);
}

.page-about .about-cats__text p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--ink-800);
}

.page-about .about-team__figure {
  margin: 0 0 40px;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(63, 224, 207, 0.16);
  background: var(--ink-900);
}

.page-about .about-team__figure figcaption {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate-300);
}

.page-about .about-team__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__card {
  position: relative;
  padding: 24px 24px 26px;
  border-radius: var(--radius-lg);
  background: var(--ink-900);
  border: 1px solid rgba(154, 174, 194, 0.18);
  overflow: hidden;
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: 0 0 var(--radius-pill) 0;
  background: var(--orange-500);
}

.page-about .about-team__count {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-900);
  background: var(--mint-300);
}

.page-about .about-team__card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  color: var(--paper-100);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm__steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 0 0 36px;
  padding: 0;
  list-style: none;
  counter-reset: rhythm;
}

.page-about .about-rhythm__step {
  padding: 22px 22px 24px;
  border-radius: var(--radius-md);
  background: rgba(19, 46, 74, 0.55);
  border-left: 3px solid var(--cyan-400);
}

.page-about .about-rhythm__step-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--orange-500);
}

.page-about .about-rhythm__step h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  color: var(--paper-100);
}

.page-about .about-rhythm__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-rhythm__aside {
  border-left-color: var(--amber-400);
}

.page-about .about-rhythm__aside-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--amber-400);
}

.page-about .about-rhythm__aside p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-rhythm__aside a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px dashed rgba(63, 224, 207, 0.55);
}

.page-about .about-rhythm__aside a:hover,
.page-about .about-rhythm__aside a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 旧链接处理 ---------- */
.page-about .about-links {
  background: var(--ink-800);
}

.page-about .about-links__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-bottom: 36px;
}

.page-about .about-links__card {
  padding: 24px 22px 26px;
  border-radius: var(--radius-lg);
  background: var(--ink-900);
  border: 1px dashed rgba(240, 180, 41, 0.42);
}

.page-about .about-links__step {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-900);
  background: var(--amber-400);
}

.page-about .about-links__card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--paper-100);
}

.page-about .about-links__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-links__cta {
  max-width: 46ch;
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-links__cta a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px dashed rgba(63, 224, 207, 0.55);
}

.page-about .about-links__cta a:hover,
.page-about .about-links__cta a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* ---------- 合作与反馈 ---------- */
.page-about .about-partners__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.page-about .about-partners__col {
  padding: 24px 22px;
  border-radius: var(--radius-md);
  background: rgba(23, 86, 94, 0.3);
  border: 1px solid rgba(155, 212, 188, 0.24);
}

.page-about .about-partners__col h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--paper-100);
}

.page-about .about-partners__col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-partners__col a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px dashed rgba(63, 224, 207, 0.55);
}

.page-about .about-partners__col a:hover,
.page-about .about-partners__col a:focus-visible {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

.page-about .about-partners__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

  .page-about .about-history__events {
    padding-left: 32px;
  }

  .page-about .about-history__marker {
    left: -33px;
  }

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

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

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

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

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

  .page-about .about-partners__split {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__stats {
    max-width: 720px;
  }

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

  .page-about .about-history__rail {
    display: block;
  }

  .page-about .about-history__sticky {
    position: sticky;
    top: var(--about-sticky-top);
  }

  .page-about .about-cats__layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

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

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-history__marker,
  .page-about .about-cats__node,
  .page-about .about-history__year-list a {
    transition: none;
  }

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