.page-about {
  background:
    radial-gradient(120% 80% at 88% -8%, rgba(18, 53, 44, 0.92) 0%, rgba(11, 20, 18, 0) 62%),
    var(--ink-900);
  color: var(--mist-100);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .about-shell {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: var(--space-l) var(--space-m) var(--space-xxl);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "rail"
    "main";
  gap: var(--space-l);
}

.page-about .about-main {
  grid-area: main;
  min-width: 0;
}

/* ---------- 索引轨道 ---------- */
.page-about .about-rail {
  grid-area: rail;
  min-width: 0;
  border-top: 1px solid var(--line-600);
  padding-top: var(--space-s);
}

.page-about .about-rail__title {
  margin: 0 0 var(--space-s);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.page-about .about-rail .rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: var(--space-m);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-rail .rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail .rail__link {
  display: block;
  white-space: nowrap;
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--mist-dim);
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.page-about .about-rail .rail__link:hover,
.page-about .about-rail .rail__link:focus-visible {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

.page-about .about-rail .rail__item.is-active .rail__link {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs-wrap {
  margin-bottom: var(--space-m);
}

.page-about .about-crumbs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-600);
}

.page-about .about-crumbs a {
  color: var(--mist-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--mist-100);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-l);
}

.page-about .about-hero .eyebrow {
  display: block;
  margin: 0 0 var(--space-m);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime-400);
}

.page-about .about-hero h1 {
  margin: 0 0 var(--space-m);
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2rem, 7.2vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--mist-100);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  color: var(--mist-dim);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  margin-top: var(--space-m);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-600);
  background: var(--forest-700);
  overflow: hidden;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 20, 18, 0) 42%, rgba(11, 20, 18, 0.55) 100%);
  pointer-events: none;
}

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

.page-about .about-hero__stats {
  list-style: none;
  margin: var(--space-l) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
}

.page-about .about-hero__stats li {
  background: var(--charcoal-800);
  padding: var(--space-m) var(--space-s);
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.7rem;
  line-height: 1.1;
  color: var(--lime-400);
}

.page-about .about-num--orange {
  color: var(--orange-500);
}

.page-about .about-num--slate {
  color: var(--slate-500);
}

.page-about .about-lab {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist-dim);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-top: var(--space-xl);
  padding-top: var(--space-l);
  border-top: 1px solid var(--line-600);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: var(--space-m);
  align-items: start;
  margin-bottom: var(--space-l);
}

.page-about .about-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--lime-400);
  padding-top: 8px;
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.45rem, 4.4vw, 2.3rem);
  line-height: 1.22;
  letter-spacing: 0.01em;
  color: var(--mist-100);
}

.page-about .about-head p {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 14px;
  color: var(--mist-dim);
}

.page-about .about-prose {
  max-width: 66ch;
}

.page-about .about-prose p {
  margin: 0 0 var(--space-m);
  color: var(--mist-100);
}

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

.page-about .about-media {
  position: relative;
  margin: var(--space-l) 0 0;
  border: 1px solid var(--line-600);
  background: var(--charcoal-800);
  overflow: hidden;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 事实条 ---------- */
.page-about .about-facts {
  list-style: none;
  margin: var(--space-l) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-600);
  border: 1px solid var(--line-600);
}

.page-about .about-facts li {
  background: var(--charcoal-800);
  padding: var(--space-m);
}

.page-about .about-facts strong {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--lime-200);
}

.page-about .about-facts span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--mist-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 var(--space-l) 30px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: -2px;
  width: 1px;
  background: var(--line-600);
}

.page-about .about-tl__item:last-child::before {
  display: none;
}

.page-about .about-tl__dot {
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--lime-400);
  border: 1px solid var(--lime-400);
  transition: box-shadow var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.page-about .about-tl__item--open .about-tl__dot {
  background: transparent;
  border-color: var(--slate-500);
}

.page-about .about-tl__item:hover .about-tl__dot {
  box-shadow: 0 0 0 5px rgba(198, 255, 61, 0.14);
}

.page-about .about-tl__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange-500);
}

.page-about .about-tl__item--open .about-tl__year {
  color: var(--slate-500);
}

.page-about .about-tl__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.15rem;
  line-height: 1.35;
  color: var(--mist-100);
}

.page-about .about-tl__body p {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--mist-dim);
}

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

.page-about .about-tl__more {
  display: block;
  padding-left: 12px;
  border-left: 1px solid var(--line-600);
  font-size: 13px;
  color: var(--slate-500);
}

/* ---------- 排班表 ---------- */
.page-about .about-table-wrap {
  margin-top: var(--space-l);
  border: 1px solid var(--line-600);
  background: var(--charcoal-800);
  overflow-x: auto;
}

.page-about .about-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table__caption {
  caption-side: top;
  text-align: left;
  padding: 12px var(--space-m);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate-500);
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 14px var(--space-m);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--slate-500);
  background: rgba(110, 140, 160, 0.08);
}

.page-about .about-table tbody th {
  font-weight: 600;
  color: var(--lime-200);
  white-space: nowrap;
}

.page-about .about-table td {
  color: var(--mist-100);
}

.page-about .about-table__time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist-dim);
  white-space: nowrap;
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table tbody tr:hover th,
.page-about .about-table tbody tr:hover td {
  background: rgba(198, 255, 61, 0.05);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-sports {
  list-style: none;
  margin: var(--space-l) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-sports li {
  padding: 6px 14px;
  border: 1px solid var(--line-600);
  font-size: 13px;
  color: var(--mist-dim);
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.page-about .about-sports li:hover {
  border-color: var(--lime-400);
  color: var(--lime-200);
}

.page-about .about-tiers {
  list-style: none;
  margin: var(--space-m) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  color: var(--mist-dim);
}

.page-about .about-tiers li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-tiers .tag {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border: 1px solid currentColor;
  border-radius: var(--radius-s);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  list-style: none;
  margin: var(--space-l) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-m);
}

.page-about .about-eco li {
  border: 1px solid var(--line-600);
  background:
    radial-gradient(90% 90% at 50% 0%, rgba(18, 53, 44, 0.75) 0%, rgba(21, 24, 26, 0) 70%),
    var(--charcoal-800);
  padding: var(--space-l) var(--space-m);
  text-align: center;
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.page-about .about-eco li:hover {
  border-color: var(--lime-400);
  box-shadow: var(--shadow-1);
  transform: translateY(-1px);
}

.page-about .about-eco__mark {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  margin: 0 auto var(--space-m);
  border-radius: 50%;
  border: 1px solid var(--lime-400);
  outline: 1px solid var(--line-600);
  outline-offset: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lime-400);
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1.2;
  color: var(--mist-100);
}

.page-about .about-eco__lab {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist-dim);
}

.page-about .about-contact {
  margin: var(--space-l) 0 0;
  padding: var(--space-m) 0 0 var(--space-m);
  border-top: 1px solid var(--line-600);
  border-left: 2px solid var(--orange-500);
  font-size: 14px;
  color: var(--mist-dim);
}

/* ---------- 尾段引导 ---------- */
.page-about .about-cta {
  margin-top: var(--space-xl);
  padding: var(--space-l) var(--space-m);
  border: 1px solid var(--line-600);
  background: linear-gradient(120deg, var(--forest-700) 0%, rgba(18, 53, 44, 0.12) 78%);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 32ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 1.15rem;
  line-height: 1.4;
  color: var(--mist-100);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    grid-template-areas: "rail main";
    gap: var(--space-xl);
    padding: var(--space-xl) var(--space-l) var(--space-xxl);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h-compact) + 28px);
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--line-600);
    padding: var(--space-s) 0 0 var(--space-m);
  }

  .page-about .about-rail .rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail .rail__item + .rail__item {
    margin-top: 2px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .about-head {
    grid-template-columns: 52px minmax(0, 1fr);
  }

  .page-about .about-tl__item {
    padding-left: 36px;
  }

  .page-about .about-tl__item:nth-child(1) {
    width: 100%;
  }

  .page-about .about-tl__item:nth-child(2) {
    width: 88%;
  }

  .page-about .about-tl__item:nth-child(3) {
    width: 74%;
  }

  .page-about .about-tl__item:nth-child(4) {
    width: 88%;
  }

  .page-about .about-tl__item:nth-child(5) {
    width: 100%;
  }

  .page-about .about-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-m);
  }

  .page-about .about-tiers li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    border-bottom: 0;
    border-left: 1px solid var(--line-600);
    padding: 0 0 0 var(--space-m);
  }

  .page-about .about-cta {
    padding: var(--space-l);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-eco li,
  .page-about .about-tl__dot,
  .page-about .about-sports li,
  .page-about .about-rail .rail__link,
  .page-about .about-crumbs a {
    transition: none;
  }

  .page-about .about-eco li:hover {
    transform: none;
  }
}
<<<END>>>