.page-about {
  --ab-gap: clamp(20px, 3.4vw, 36px);
  background: var(--night);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .container {
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 78% 0%, rgba(45, 226, 197, 0.14), transparent 58%),
    radial-gradient(95% 70% at 8% 8%, rgba(30, 142, 78, 0.2), transparent 62%),
    linear-gradient(180deg, var(--night-soft), var(--night) 80%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(36, 65, 74, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 65, 74, 0.5) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.42;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-about .ab-hero .container {
  z-index: 1;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0 0 clamp(18px, 3vw, 30px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb-current {
  color: var(--paper);
}

.page-about .ab-hero-grid {
  display: grid;
  gap: var(--ab-gap);
  align-items: end;
}

.page-about .ab-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-kicker-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 20px;
  background: var(--turf);
  color: var(--night);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.page-about .ab-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  transform: skewX(-2deg);
  transform-origin: left bottom;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.4);
}

.page-about .ab-lead {
  max-width: 46ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(237, 245, 238, 0.85);
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero-figure {
  margin: 0;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

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

.page-about .media-frame-caption {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 外壳：侧栏 + 长文 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(44px, 8vw, 96px);
}

.page-about .ab-index {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  min-width: 0;
}

.page-about .ab-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

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

.page-about .ab-index-list li {
  flex: 0 0 auto;
}

.page-about .ab-index-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: rgba(10, 46, 43, 0.55);
  color: var(--paper);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--ease), background-color var(--ease), color var(--ease);
}

.page-about .ab-index-link:hover,
.page-about .ab-index-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .ab-index-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--turf);
}

.page-about .ab-index-foot {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-flow {
  min-width: 0;
}

.page-about .ab-section {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.page-about .ab-section + .ab-section {
  margin-top: clamp(44px, 7vw, 88px);
}

.page-about .section-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .section-label-num {
  color: var(--turf);
}

.page-about .ab-section h2 {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .ab-section h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-section-intro {
  max-width: 56ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(237, 245, 238, 0.78);
}

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

.page-about .ab-prose p {
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(237, 245, 238, 0.86);
}

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

/* ---------- 版本时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin-top: 24px;
  padding-left: 26px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--line) 0%, var(--indigo) 46%, var(--line) 100%);
}

.page-about .ab-node {
  position: relative;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--indigo);
  border: 1px solid var(--cyan);
  transition: background-color var(--ease);
}

.page-about .ab-node[open]::before {
  background: var(--cyan);
}

.page-about .ab-node-summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-node-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .ab-node-title {
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 600;
  color: var(--paper);
  transition: color var(--ease);
}

.page-about .ab-node-summary:hover .ab-node-title {
  color: var(--cyan);
}

.page-about .ab-node-body {
  padding: 0 0 16px;
}

.page-about .ab-node-body p {
  max-width: 60ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(237, 245, 238, 0.78);
}

.page-about .ab-version-visual {
  margin: 26px 0 0;
  border: 1px solid var(--line);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-figure {
  margin: 0;
  align-self: start;
  border: 1px solid var(--line);
}

.page-about .ab-crew {
  margin-top: 26px;
}

.page-about .ab-crew-total {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-left: 3px solid var(--turf);
  background: linear-gradient(100deg, rgba(30, 142, 78, 0.24), rgba(6, 24, 38, 0) 72%);
}

.page-about .ab-crew-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(46px, 8vw, 72px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-crew-label {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-crew-desc {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-crew-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-top: none;
}

.page-about .ab-crew-card {
  background: var(--night-soft);
  padding: 16px 16px 18px;
  transition: background-color var(--ease);
}

.page-about .ab-crew-card:hover,
.page-about .ab-crew-card:focus-within {
  background: var(--deep-teal);
}

.page-about .ab-crew-count {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .ab-crew-name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-crew-duty {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 三级校验 ---------- */
.page-about .ab-steps {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .ab-step {
  padding: 20px 18px 24px;
  border-left: 2px solid var(--turf);
  background: linear-gradient(155deg, rgba(30, 142, 78, 0.18), rgba(10, 46, 43, 0.94) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: border-color var(--ease);
}

.page-about .ab-step:hover {
  border-left-color: var(--cyan);
}

.page-about .ab-step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-step h3 {
  margin: 8px 0 8px;
  font-size: 18px;
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(237, 245, 238, 0.8);
}

.page-about .ab-process-note {
  margin-top: 20px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-eco-card {
  padding: 20px 18px 22px;
  background: linear-gradient(160deg, var(--wine), rgba(74, 31, 46, 0.7));
  transition: background var(--ease);
}

.page-about .ab-eco-card:hover {
  background: linear-gradient(160deg, #5c2739, var(--wine));
}

.page-about .ab-eco-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-eco-unit {
  margin-left: 4px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(237, 245, 238, 0.72);
}

.page-about .ab-eco-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--paper);
}

.page-about .ab-eco-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(237, 245, 238, 0.78);
}

.page-about .ab-eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .ab-eco-tags li {
  padding: 3px 8px;
  border: 1px solid rgba(237, 245, 238, 0.3);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(237, 245, 238, 0.86);
}

/* ---------- 合作收尾 ---------- */
.page-about .ab-cta {
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  background: linear-gradient(120deg, var(--deep-teal), var(--indigo));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .ab-cta h2 {
  color: var(--paper);
}

.page-about .ab-cta-list {
  display: grid;
  gap: 10px;
  max-width: 58ch;
  list-style: none;
  margin: 16px 0 24px;
  padding: 0;
}

.page-about .ab-cta-list li {
  padding-left: 14px;
  border-left: 1px solid var(--cyan);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(237, 245, 238, 0.86);
}

.page-about .ab-cta-list strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.page-about .ab-cta-link {
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 226, 197, 0.4);
  padding-bottom: 2px;
  transition: border-color var(--ease), color var(--ease);
}

.page-about .ab-cta-link:hover,
.page-about .ab-cta-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-shell {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .ab-index {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    align-self: start;
  }

  .page-about .ab-index-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-index-link {
    border: none;
    border-left: 2px solid var(--line);
    background: none;
    padding: 9px 0 9px 12px;
    white-space: normal;
  }

  .page-about .ab-index-link:hover,
  .page-about .ab-index-link:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(45, 226, 197, 0.07);
  }

  .page-about .ab-cta-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 28px;
  }

  .page-about .ab-cta-actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-crew-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index-link,
  .page-about .ab-node::before,
  .page-about .ab-node-title,
  .page-about .ab-crew-card,
  .page-about .ab-step,
  .page-about .ab-eco-card,
  .page-about .breadcrumb-link,
  .page-about .ab-cta-link {
    transition: none;
  }

  .page-about .ab-hero h1 {
    transform: none;
  }
}
<<<END>>>