.page-about {
  --about-ch: min(62ch, 100%);
  position: relative;
  background-color: var(--ink);
  color: var(--fog);
  font-family: var(--font-cn);
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.3;
  pointer-events: none;
  z-index: 0;
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs-wrap {
  padding-top: clamp(20px, 4vw, 34px);
}

.page-about .crumbs a {
  color: var(--note);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

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

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-hero__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__copy .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-hero h1 {
  margin: 0.5em 0 0;
  max-width: 20ch;
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-hero__lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 47ch;
  font-size: 1.03rem;
  line-height: 1.85;
  color: var(--fog);
  opacity: 0.82;
}

.page-about .about-hero__board {
  border: var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(18, 42, 64, 0.95), rgba(11, 27, 43, 0.9));
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-board__label {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--note);
}

.page-about .about-board__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-board__list li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(30, 58, 82, 0.8);
}

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

.page-about .about-board__num {
  font-size: clamp(1.5rem, 3vw, 1.95rem);
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .about-board__unit {
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--fog);
  opacity: 0.84;
}

/* ---------- 索引 + 正文画布 ---------- */

.page-about .about-canvas {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-index {
  min-width: 0;
  border-bottom: 1px solid var(--line);
  padding-bottom: 4px;
}

.page-about .about-index__title {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--note);
}

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: block;
  white-space: nowrap;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.06em;
  color: var(--note);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink);
  background-color: var(--signal);
  border-color: var(--signal);
  outline: none;
}

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

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding: clamp(30px, 4.6vw, 50px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-chapter .sec-head {
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-body .prose p {
  max-width: var(--about-ch);
  margin: 0 0 1.05em;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--fog);
  opacity: 0.88;
}

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

.page-about .about-body .prose a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 245, 192, 0.45);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

/* ---------- 关键数字 ---------- */

.page-about .about-figure {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-bottom: 14px;
  max-width: var(--about-ch);
  border-bottom: 1px solid var(--signal-deep);
}

.page-about .about-figure__num {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1;
  color: var(--fog);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .about-figure__label {
  font-size: 0.87rem;
  line-height: 1.6;
  color: var(--note);
}

/* ---------- 横向刻度尺 ---------- */

.page-about .about-scale {
  margin: clamp(24px, 3.6vw, 34px) 0 0;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .about-scale:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}

.page-about .about-scale__list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  min-width: 660px;
}

.page-about .about-scale__item {
  position: relative;
  flex: 1 0 132px;
  padding: 20px 18px 0 0;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-scale__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 1px;
  height: 14px;
  background-color: var(--line);
}

.page-about .about-scale__item:first-child::before {
  background-color: var(--signal);
}

.page-about .about-scale__year {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale__title {
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-scale__text {
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--note);
}

/* ---------- 图片 ---------- */

.page-about .about-media {
  margin: clamp(24px, 3.6vw, 34px) 0 0;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--signal-deep);
  object-fit: cover;
  background-color: var(--hold);
}

.page-about .about-media--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-media--square img {
  aspect-ratio: 1 / 1;
  max-width: 420px;
}

.page-about .about-media__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  line-height: 1.7;
  color: var(--note);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 clamp(24px, 4vw, 40px);
}

.page-about .about-team__item {
  position: relative;
  padding: 16px 0 16px 14px;
  border-bottom: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-team__item:hover {
  border-left-color: var(--signal);
  background-color: rgba(18, 42, 64, 0.45);
}

.page-about .about-team__name {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-team__desc {
  margin: 6px 0 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--amber);
}

.page-about .about-team__rhythm {
  margin: 8px 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--note);
  transition: color 0.22s var(--ease);
}

.page-about .about-team__item:hover .about-team__rhythm {
  color: var(--fog);
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  padding: 0 0 clamp(50px, 8vw, 96px);
}

.page-about .about-cta__inner {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(18, 42, 64, 0.95), rgba(11, 27, 43, 0.82));
  padding: clamp(26px, 4vw, 44px);
}

.page-about .about-cta__eyebrow {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-cta h2 {
  margin: 12px 0 0;
  max-width: 22ch;
  font-size: clamp(1.4rem, 3vw, 2.05rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--fog);
  opacity: 0.84;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-canvas {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: clamp(44px, 6vw, 84px);
  }

  .page-about .about-index {
    position: sticky;
    top: 36px;
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index__list li {
    flex: none;
  }

  .page-about .about-index__list a {
    padding: 7px 0 7px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 0.76rem;
    letter-spacing: 0.04em;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    color: var(--signal);
    background-color: transparent;
    border-left-color: var(--signal);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a,
  .page-about .about-team__item,
  .page-about .about-team__rhythm,
  .page-about .about-body .prose a,
  .page-about .crumbs a {
    transition: none;
  }
}
<<<END>>>