.page-about {
  --about-index-w: 216px;
  --about-gap: clamp(28px, 4vw, 64px);
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-crumbs {
  padding-top: clamp(14px, 2.5vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: var(--line);
  padding-bottom: clamp(32px, 5vw, 60px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(18px, 3vw, 34px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.03em;
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  max-width: 48ch;
}

.page-about .about-hero__facts {
  background: var(--white);
  border: var(--line);
  box-shadow: var(--shadow);
  padding: clamp(16px, 3vw, 22px);
}

.page-about .facts__head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.page-about .facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .fact {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 12px;
  padding: 10px 0;
  border-top: 1px solid var(--edge);
  font-size: 14px;
}

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

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

.page-about .fact__k {
  color: var(--graphite);
}

.page-about .fact__v {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ---------- 主体：索引 + 正文 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(24px, 4vw, 44px) clamp(28px, 4vw, 48px);
}

.page-about .about-index {
  margin-bottom: clamp(20px, 4vw, 32px);
}

.page-about .about-index__head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.page-about .about-index .index-list {
  display: grid;
  gap: 2px;
}

.page-about .index-list__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--graphite);
  text-decoration: none;
  border-left: 2px solid var(--edge);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .index-list__link:hover,
.page-about .index-list__link:focus-visible {
  color: var(--ink);
  border-left-color: var(--blue);
  outline: none;
}

.page-about .index-list__link:focus-visible {
  box-shadow: 0 0 0 2px var(--blue);
}

.page-about .index-list__link[aria-current="true"] {
  color: var(--ink);
  font-weight: 700;
  background: var(--slab);
  border-left-color: var(--blue);
}

.page-about .index-list__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-about .about-section {
  border-top: 1px solid var(--edge);
  padding-block: clamp(28px, 4.5vw, 56px);
}

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

.page-about .about-prose {
  max-width: 64ch;
}

.page-about .about-prose p {
  margin: 0 0 1em;
  line-height: 1.8;
}

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

.page-about .about-figure {
  margin: clamp(22px, 4vw, 36px) 0 0;
}

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

.page-about .about-figure .figure__cap {
  margin-top: 10px;
  font-size: 13px;
  color: var(--graphite);
  line-height: 1.6;
}

.page-about .pullquote {
  margin: clamp(22px, 4vw, 38px) 0 0;
  padding: 4px 0 4px 20px;
  border-left: 6px solid var(--blue);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 25px);
  line-height: 1.5;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--ink);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3.5vw, 38px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--paper);
  border: 2px solid var(--ink);
}

.page-about .timeline__item--now::before {
  background: var(--blue);
  border-color: var(--blue);
}

.page-about .timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.35;
}

.page-about .timeline__text {
  margin: 0;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.8;
  max-width: 60ch;
}

/* ---------- 团队标签页 ---------- */
.page-about .role-tabs {
  margin-top: clamp(20px, 3.5vw, 32px);
}

.page-about .role-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(16px, 3vw, 24px);
}

.page-about .role-tabs .tab {
  font-family: inherit;
  font-size: 14px;
  line-height: 1.4;
  padding: 9px 15px;
  background: var(--white);
  color: var(--ink);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.16s var(--ease), color 0.16s var(--ease), border-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .role-tabs .tab:hover {
  border-color: var(--ink);
}

.page-about .role-tabs .tab:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .role-tabs .tab[aria-selected="true"] {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--white);
  font-weight: 700;
  box-shadow: 4px 4px 0 var(--ink);
}

.page-about .role-tabs .tabs__panel {
  background: var(--white);
  border: var(--line);
  box-shadow: var(--shadow);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .role-tabs .tabs__panel + .tabs__panel {
  margin-top: 14px;
}

.page-about .role-title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 23px);
}

.page-about .role-text {
  margin: 0 0 14px;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .role-list {
  margin: 0;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.9;
}

.page-about .role-list li::marker {
  color: var(--blue);
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  background: var(--ink);
  color: var(--white);
  border-top: 6px solid var(--blue);
  border-bottom: var(--line);
  padding-block: clamp(36px, 5.5vw, 68px);
}

.page-about .about-band .section-head__index,
.page-about .about-band .section-head__note {
  color: var(--foot-dim);
}

.page-about .about-band .section-head__title {
  color: var(--white);
}

.page-about .band-grid {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(220, 228, 238, 0.18);
}

.page-about .band-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--ink);
  padding: clamp(14px, 2.5vw, 22px) clamp(12px, 2vw, 18px);
}

.page-about .band-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 4.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .band-num em {
  font-style: normal;
  font-size: 0.42em;
  margin-left: 3px;
  color: var(--cyan);
}

.page-about .band-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--foot-dim);
}

.page-about .band-note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding-left: 14px;
  border-left: 4px solid var(--cyan);
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--foot-dim);
}

/* ---------- 尾段 ---------- */
.page-about .about-tail {
  padding-block: 0 clamp(32px, 5vw, 64px);
}

.page-about .about-tail .about-section:first-child {
  border-top: 0;
  padding-top: clamp(28px, 4.5vw, 56px);
}

.page-about .mech-list {
  list-style: none;
  margin: clamp(20px, 3.5vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--edge);
}

.page-about .mech {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(14px, 2.5vw, 20px) 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .mech__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.page-about .mech__t {
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .mech__d {
  margin: 0;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .flow {
  list-style: none;
  margin: clamp(20px, 3.5vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.5vw, 20px);
}

.page-about .flow__item {
  background: var(--white);
  border: var(--line);
  box-shadow: var(--shadow);
  padding: clamp(16px, 3vw, 24px);
}

.page-about .flow__num {
  display: inline-block;
  padding: 3px 8px;
  background: var(--blue);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .flow__t {
  margin: 12px 0 8px;
  font-size: 18px;
}

.page-about .flow__d {
  margin: 0;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-cta {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  border-top: var(--line);
  margin-top: clamp(16px, 3vw, 28px);
  padding-block: clamp(32px, 5vw, 64px);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 38px);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 48ch;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.8;
}

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

.page-about [data-reveal] {
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .band-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .mech {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 0 20px;
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    column-gap: var(--about-gap);
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .about-tail {
    padding-left: calc(var(--gutter) + var(--about-index-w) + var(--about-gap));
  }
}

@media (min-width: 1080px) {
  .page-about .band-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }

  .page-about [data-reveal] {
    transform: none !important;
  }
}

<<<END>>>