.page-about {
  overflow-x: clip;
  --about-rail: 176px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  padding-top: clamp(18px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(49, 242, 222, 0.05) 0 1px,
    transparent 1px 7px
  );
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.95rem, 6vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 17ch;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 60ch;
  color: var(--ink-dim);
  font-size: 1.0625rem;
  line-height: 1.85;
}

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

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-stat:hover {
  border-color: rgba(49, 242, 222, 0.5);
  background: rgba(49, 242, 222, 0.05);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__num small {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--ink-dim);
}

.page-about .about-stat__label {
  font-size: 0.8125rem;
  color: var(--ink-dim);
  letter-spacing: 0.02em;
}

/* ---------- 通用分节与不对称双栏 ---------- */
.page-about .section {
  padding: clamp(48px, 7vw, 92px) 0;
}

.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-rail__label {
  display: inline-block;
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--ink-dim);
}

.page-about .about-body .h-section {
  margin: 0 0 20px;
}

/* ---------- 版本历程 ---------- */
.page-about .about-sec-head {
  max-width: 740px;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-sec-head .h-section {
  margin: 12px 0 0;
}

.page-about .about-sec-lede {
  margin: 16px 0 0;
  color: var(--ink-dim);
  font-size: 1rem;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .about-timeline-figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

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

.page-about .about-mile {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 24px 18px;
  border-top: 1px solid var(--hair);
  border-radius: var(--radius-md);
  outline: none;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-mile:first-child {
  border-top-color: transparent;
}

.page-about .about-mile:hover,
.page-about .about-mile:focus-visible {
  border-color: rgba(49, 242, 222, 0.45);
  background: linear-gradient(90deg, rgba(49, 242, 222, 0.08), rgba(49, 242, 222, 0) 72%);
}

.page-about .about-mile__badge {
  align-self: start;
  min-width: 52px;
  padding: 5px 12px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--grape);
  border: 1px solid rgba(165, 107, 255, 0.45);
  border-radius: var(--radius-pill);
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-mile:hover .about-mile__badge,
.page-about .about-mile:focus-visible .about-mile__badge {
  color: var(--void);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-mile__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-mile__body p {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.9375rem;
  line-height: 1.8;
  max-width: 62ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-team__body .h-section {
  margin: 12px 0 16px;
}

.page-about .about-team__body > .prose {
  margin: 0 0 26px;
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-roles {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  background: var(--panel);
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-role:hover,
.page-about .about-role[open] {
  border-color: rgba(49, 242, 222, 0.45);
  background: rgba(49, 242, 222, 0.04);
}

.page-about .about-role__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-role__head::after {
  content: "+";
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--cyan);
}

.page-about .about-role[open] .about-role__head::after {
  content: "–";
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .about-role__unit {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-dim);
}

.page-about .about-role__list {
  list-style: none;
  margin: 0;
  padding: 0 20px 20px;
  display: grid;
  gap: 9px;
}

.page-about .about-role__list li {
  position: relative;
  padding-left: 16px;
  color: var(--ink-dim);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .about-role__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

/* ---------- 实测 ---------- */
.page-about .about-lab__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-lab-figure {
  margin: 0;
}

.page-about .about-lab__body .h-section {
  margin: 12px 0 16px;
}

.page-about .about-lab__body > .prose {
  margin: 0 0 26px;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hair);
}

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

.page-about .about-step__n {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid rgba(49, 242, 222, 0.4);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .about-step p {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ---------- 规模 ---------- */
.page-about .about-scale__copy .h-section {
  margin: 12px 0 18px;
}

.page-about .about-scale__copy .prose + .prose {
  margin-top: 14px;
}

.page-about .about-scale__nums {
  display: grid;
  gap: 26px;
  align-content: start;
}

.page-about .about-num {
  padding-left: 18px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-num__val {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-num__val small {
  font-size: 0.4em;
  margin-left: 3px;
  color: var(--cyan);
}

.page-about .about-num__key {
  display: block;
  margin-top: 9px;
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--ink-dim);
}

/* ---------- 延伸入口 ---------- */
.page-about .about-links {
  display: grid;
  gap: 14px;
}

.page-about .about-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "k t"
    "k d";
  gap: 3px 18px;
  padding: 20px 22px;
  text-decoration: none;
  background: rgba(14, 21, 36, 0.72);
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(49, 242, 222, 0.07);
}

.page-about .about-link:active {
  transform: scale(0.985);
}

.page-about .about-link__k {
  grid-area: k;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--grape);
  font-variant-numeric: tabular-nums;
}

.page-about .about-link__t {
  grid-area: t;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-link__d {
  grid-area: d;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--ink-dim);
}

/* ---------- 图片与媒体框 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-team-figure img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-lab-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 移动优先之上的桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-about .about-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: 56px;
    align-items: end;
  }

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

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

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-lab__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-scale__grid {
    align-items: start;
  }

  .page-about .about-scale__nums {
    gap: 34px;
    padding-top: 8px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  }

  .page-about .about-mile {
    padding: 26px 24px;
  }
}

/* ---------- 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-link,
  .page-about .about-stat,
  .page-about .about-role,
  .page-about .about-mile,
  .page-about .about-mile__badge {
    transition: none;
  }

  .page-about .about-link:active {
    transform: none;
  }
}
<<<END>>>