.page-about {
  --about-edge: 1px solid var(--line-soft);
  --about-pad: clamp(16px, 2.4vw, 26px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  color: var(--mist);
  text-wrap: balance;
}

.page-about h1 {
  font-size: clamp(2.1rem, 5.6vw, 3.6rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.06;
  margin: 0.35em 0 0.55em;
}

.page-about h2 {
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.18;
  margin: 0.3em 0 0.5em;
}

.page-about a {
  color: var(--gold-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 204, 107, 0.35);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

.page-about .breadcrumb {
  margin-top: clamp(14px, 3vw, 26px);
}

.page-about .breadcrumb a {
  border-bottom: none;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(18px, 3.6vw, 40px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: rgba(233, 239, 232, 0.82);
  max-width: 48ch;
  margin: 0;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 32px);
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--line);
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 88px;
}

.page-about .fact__num {
  font-size: clamp(1.5rem, 3.2vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-bright);
  font-variant-numeric: tabular-nums;
}

.page-about .fact__label {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .about-hero__figure {
  margin: 0;
  aspect-ratio: 3 / 4;
}

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

/* ---------- 主体分栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .about-rail {
  border: var(--about-edge);
  border-radius: var(--radius);
  background: rgba(12, 42, 33, 0.6);
  padding: clamp(14px, 2.2vw, 20px);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

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

.page-about .about-rail__list a {
  display: block;
  padding: 8px 10px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--mist);
  border: none;
  border-left: 2px solid transparent;
  border-radius: 2px;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--gold-bright);
  border-left-color: var(--gold);
  background: rgba(24, 74, 56, 0.55);
}

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

.page-about .about-chapter {
  padding-top: clamp(30px, 5vw, 56px);
}

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

.page-about .about-chapter__lead {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(233, 239, 232, 0.72);
  max-width: 56ch;
}

.page-about .about-note {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(233, 239, 232, 0.76);
  border-left: 2px solid var(--gold);
  background: rgba(24, 74, 56, 0.28);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: clamp(22px, 3.6vw, 34px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 30px;
  padding-bottom: clamp(18px, 3vw, 28px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line) 0%, rgba(24, 74, 56, 0.18) 100%);
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 13px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: var(--ink-900);
  box-shadow: 0 0 0 4px rgba(215, 169, 59, 0.1);
}

.page-about .timeline__item.is-current .timeline__dot {
  border-color: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 107, 61, 0.16);
}

.page-about .stage {
  border: var(--about-edge);
  border-left: 2px solid var(--line);
  border-radius: var(--radius);
  padding: var(--about-pad);
  background: linear-gradient(160deg, rgba(18, 53, 42, 0.88) 0%, rgba(8, 29, 22, 0.94) 100%);
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .stage:hover,
.page-about .stage:focus-within {
  border-left-color: var(--gold);
}

.page-about .timeline__item.is-current .stage {
  border-left-color: var(--signal);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 61, 0.16);
}

.page-about .stage__label {
  margin: 0 0 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .timeline__item.is-current .stage__label {
  color: var(--signal);
}

.page-about .stage__title {
  margin: 0 0 10px;
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.3;
}

.page-about .stage p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(233, 239, 232, 0.8);
}

.page-about .stage__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .stage__more summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold-bright);
  list-style: none;
}

.page-about .stage__more summary::-webkit-details-marker {
  display: none;
}

.page-about .stage__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
  width: 12px;
}

.page-about .stage__more[open] summary::before {
  content: "\2212";
}

.page-about .stage__more summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.page-about .stage__more p {
  margin-top: 10px;
  font-size: 14px;
  color: rgba(233, 239, 232, 0.7);
}

/* ---------- 四类栏目 ---------- */

.page-about .team-figure {
  margin: clamp(18px, 2.8vw, 26px) 0 0;
}

.page-about .columns-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 12px;
  margin-top: clamp(16px, 2.6vw, 24px);
}

.page-about .column-card {
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--gold);
  border-radius: var(--radius);
  padding: 14px 14px 16px;
  background: rgba(12, 42, 33, 0.62);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .column-card:hover {
  border-color: var(--gold);
  border-top-color: var(--gold-bright);
  background: rgba(18, 53, 42, 0.72);
}

.page-about .column-card__title {
  margin: 0 0 7px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .column-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(233, 239, 232, 0.68);
}

.page-about .tagline-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

/* ---------- 团队表格 ---------- */

.page-about .table-caption {
  margin: clamp(20px, 3vw, 28px) 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .data-table th,
.page-about .data-table td {
  font-variant-numeric: tabular-nums;
}

/* ---------- 合作 ---------- */

.page-about .coop-grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
  margin-top: clamp(16px, 2.6vw, 24px);
}

.page-about .coop-card {
  border: var(--about-edge);
  border-radius: var(--radius);
  padding: var(--about-pad);
  background: rgba(8, 29, 22, 0.72);
}

.page-about .coop-card__title {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--gold-bright);
}

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

.page-about .coop-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(233, 239, 232, 0.78);
}

.page-about .coop-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

.page-about .coop-card__foot {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(233, 239, 232, 0.66);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .coop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: clamp(32px, 5vw, 64px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: clamp(36px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-main {
    order: 1;
  }

  .page-about .about-rail {
    order: 2;
    position: sticky;
    top: 104px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .column-card,
  .page-about .about-rail__list a {
    transition: none;
  }
}
<<<END>>>