.page-about {
  --ab-rail: 112px;
  --ab-gap: clamp(20px, 3vw, 48px);
  --ab-line: 1px solid var(--line);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: clamp(16px, 2.5vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(22px, 4vw, 44px) clamp(42px, 6vw, 80px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
    align-items: center;
  }
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 5.2vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15.5px, 1.3vw, 17.5px);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .ab-hero__stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  background: var(--line);
  border: var(--ab-line);
}

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

.page-about .ab-hero__stats li {
  background: var(--bg);
  padding: 14px 14px 16px;
}

.page-about .ab-hero__num {
  display: block;
  font-size: clamp(21px, 2.4vw, 29px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .ab-hero__unit {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ab-hero__act {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 26px;
  margin-top: 30px;
}

.page-about .ab-hero__fig {
  position: relative;
  margin: 0;
  border: var(--ab-line);
  background: var(--surface);
}

.page-about .ab-hero__fig::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 3px;
  background: var(--lime);
  z-index: 1;
}

.page-about .ab-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .ab-hero__cap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 12px 14px;
  border-top: var(--ab-line);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  border-top: var(--ab-line);
  padding-block: clamp(40px, 5.6vw, 80px);
}

.page-about .chapter__grid {
  position: relative;
  display: grid;
  gap: var(--ab-gap);
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .chapter__num {
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--lime);
}

.page-about .chapter__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

@media (min-width: 880px) {
  .page-about .chapter__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 0;
  }

  .page-about .chapter__grid::before {
    content: "";
    position: absolute;
    top: -4px;
    bottom: -4px;
    left: calc(var(--pad) + var(--ab-rail) - 1px);
    width: 1px;
    background: var(--line);
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-right: clamp(18px, 2.6vw, 34px);
    position: sticky;
    top: calc(var(--masthead-h) + 20px);
    align-self: start;
  }

  .page-about .chapter__body {
    padding-left: clamp(20px, 3vw, 44px);
  }
}

.page-about .chapter__title {
  margin: 0 0 16px;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .chapter__body p {
  margin: 0 0 14px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .chapter__body .chapter__lead {
  max-width: 60ch;
  margin-bottom: 26px;
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--muted);
}

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

.page-about .pull {
  margin: 28px 0 0;
  padding: 22px 24px;
  border-left: 3px solid var(--lime);
  background: var(--surface);
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.62;
  font-weight: 500;
  color: var(--ink);
}

.page-about .pull p {
  margin: 0;
}

/* ---------- 流程折叠 ---------- */
.page-about .split {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  align-items: start;
}

@media (min-width: 1080px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }
}

.page-about .flow {
  border-top: var(--ab-line);
}

.page-about .flow__item {
  border-bottom: var(--ab-line);
  background: transparent;
  transition: background 0.16s var(--ease);
}

.page-about .flow__item[open] {
  background: var(--surface);
}

.page-about .flow__sum {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 18px 56px 18px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  transition: background 0.16s var(--ease);
}

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

.page-about .flow__sum::marker {
  content: "";
}

.page-about .flow__sum:hover {
  background: var(--surface-2);
}

.page-about .flow__sum::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 400;
  line-height: 1;
  color: var(--lime);
}

.page-about .flow__item[open] .flow__sum::after {
  content: "−";
}

.page-about .flow__idx {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .flow__body {
  padding: 2px 52px 20px 70px;
}

.page-about .flow__body p {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink);
  opacity: 0.85;
}

/* ---------- 通用配图 ---------- */
.page-about .fig {
  margin: 0;
  border: var(--ab-line);
  background: var(--surface);
}

.page-about .fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .fig figcaption {
  padding: 12px 14px;
  border-top: var(--ab-line);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  align-items: start;
}

@media (min-width: 1040px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.page-about .bars {
  display: grid;
  gap: 16px;
  padding: 24px 22px;
  border: var(--ab-line);
  background: var(--surface);
}

.page-about .bar {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) 38px;
  gap: 12px;
  align-items: center;
}

@media (max-width: 520px) {
  .page-about .bar {
    grid-template-columns: 76px minmax(0, 1fr) 32px;
    gap: 9px;
  }
}

.page-about .bar__label {
  font-size: 13.5px;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .bar__track {
  display: block;
  height: 10px;
  background: var(--bg);
  border: var(--ab-line);
}

.page-about .bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--heat), var(--lime-soft));
}

.page-about .bar__fill--1 { width: 38%; }
.page-about .bar__fill--2 { width: 26%; }
.page-about .bar__fill--3 { width: 19%; }
.page-about .bar__fill--4 { width: 17%; }

.page-about .bar__val {
  font-size: 14px;
  text-align: right;
  color: var(--lime);
}

.page-about .team-note {
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: var(--ab-line);
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  position: relative;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 28px 30px;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--line);
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .tl__era {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .tl__title {
  margin: 8px 0 0;
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  transition: color 0.16s var(--ease);
}

.page-about .tl__item:hover .tl__title {
  color: var(--lime);
}

.page-about .tl__note {
  margin: 8px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  transition: color 0.16s var(--ease);
}

.page-about .tl__item:hover .tl__note {
  color: var(--ink);
}

/* ---------- 合作生态点阵 ---------- */
.page-about .dots {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  max-width: 300px;
  margin: 28px 0 0;
  padding: 0;
}

@media (min-width: 700px) {
  .page-about .dots {
    grid-template-columns: repeat(10, minmax(0, 1fr));
    gap: 12px;
    max-width: 460px;
  }
}

.page-about .dot {
  aspect-ratio: 1;
  transition: transform 0.16s var(--ease), opacity 0.16s var(--ease);
}

.page-about .dot--ops {
  background: var(--heat);
}

.page-about .dot--acad {
  background: var(--amber);
}

.page-about .dot:hover {
  transform: scale(1.28);
}

.page-about .legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 24px 0 0;
  padding: 0;
  font-size: 13px;
  color: var(--ink);
}

.page-about .legend li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.page-about .legend__swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  flex: none;
}

.page-about .legend__swatch--ops { background: var(--heat); }
.page-about .legend__swatch--acad { background: var(--amber); }

.page-about .legend__swatch--long {
  background: transparent;
  border: 1px solid var(--lime);
}

.page-about .honor {
  margin-top: 28px;
  padding: 18px 20px;
  border-left: 3px solid var(--amber);
  background: var(--surface);
}

.page-about .honor p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 合作交付 ---------- */
.page-about .deliver {
  display: grid;
  gap: 1px;
  margin-top: 6px;
  background: var(--line);
  border: var(--ab-line);
}

@media (min-width: 720px) {
  .page-about .deliver {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .deliver__item {
  background: var(--surface);
  padding: 24px 22px 26px;
  transition: background 0.16s var(--ease);
}

.page-about .deliver__item:hover {
  background: var(--surface-2);
}

.page-about .deliver__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .deliver__name {
  margin: 12px 0 10px;
  font-size: clamp(17px, 1.7vw, 20px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .deliver__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink);
  opacity: 0.85;
}

.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 28px;
  margin-top: 32px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .dot,
  .page-about .flow__sum,
  .page-about .flow__item,
  .page-about .deliver__item,
  .page-about .tl__item::before,
  .page-about .tl__title,
  .page-about .tl__note {
    transition: none;
  }
}
<<<END>>>