.page-about {
  --about-gap: clamp(16px, 2.4vw, 28px);
  --about-pad: clamp(52px, 7vw, 96px);
  color: var(--paper);
  background-color: var(--ink-950);
}

.page-about .section {
  padding-block: var(--about-pad);
}

.page-about .section-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .section-head--wide {
  max-width: 78ch;
}

.page-about .section-copy {
  max-width: 58ch;
}

.page-about .hero-lede,
.page-about .prose p,
.page-about .service-item p,
.page-about .role-card p,
.page-about .coop-list p,
.page-about .step p,
.page-about .team-note,
.page-about .network-note p {
  color: var(--paper);
  opacity: .88;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 3vw, 36px) clamp(36px, 5vw, 64px);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(57, 255, 176, .12), transparent 58%),
    var(--ink-950);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(44, 90, 75, .22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 90, 75, .22) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .55), transparent 72%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .55), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .hero-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .hero-copy h1 {
  margin: 10px 0 16px;
  max-width: 18ch;
  font-family: var(--font-display);
  font-size: clamp(34px, 7.2vw, 64px);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.02em;
}

.page-about .hero-lede {
  max-width: 44ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 28px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}

.page-about .hero-facts .num {
  display: inline-block;
  margin-right: 4px;
  color: var(--acid);
  font-size: 17px;
  font-weight: 700;
}

.page-about .hero-side {
  display: grid;
  gap: var(--about-gap);
}

.page-about .file-card {
  padding: clamp(18px, 2.4vw, 26px);
  border-radius: var(--radius-lg);
}

.page-about .file-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .file-no {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--acid-soft);
}

.page-about .file-meta {
  display: grid;
  gap: 0;
  margin: 8px 0 0;
}

.page-about .file-meta > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(44, 90, 75, .8);
}

.page-about .file-meta dt {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .file-meta dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .file-meta dd.num {
  color: var(--acid);
}

.page-about .role-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .hero-figure {
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
}

.page-about .hero-figure img {
  aspect-ratio: 3 / 2;
  filter: saturate(.72);
}

/* 章节标签 */
.page-about .archive-tabs {
  position: relative;
  z-index: 2;
  border-block: 1px solid var(--line);
  background: var(--ink-900);
}

.page-about .tab-shell {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-block: 10px;
  scrollbar-width: none;
}

.page-about .tab-shell::-webkit-scrollbar {
  display: none;
}

.page-about .tab-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: background-color .16s var(--ease), color .16s var(--ease);
}

.page-about .tab-link:hover,
.page-about .tab-link:focus-visible {
  background: var(--teal);
  color: var(--paper);
}

.page-about .tab-no {
  font-size: 11px;
  color: var(--acid);
}

/* 业务起点 */
.page-about .origin-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .origin-grid .prose p {
  margin: 0 0 14px;
  line-height: 1.8;
}

.page-about .service-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .service-item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  padding: 16px 16px 16px 14px;
  background: var(--ink-800);
  border-left: 3px solid var(--acid);
  border-radius: var(--radius-sm);
}

.page-about .service-no {
  font-size: 12px;
  color: var(--acid);
  letter-spacing: .1em;
}

.page-about .service-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .01em;
}

.page-about .service-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

/* 发展历程 */
.page-about .section--timeline {
  background: var(--ink-900);
}

.page-about .timeline-wrap {
  position: relative;
  padding: clamp(20px, 3vw, 34px) clamp(14px, 2.4vw, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .timeline-bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
}

.page-about .timeline-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .16;
  filter: saturate(.55);
}

.page-about .timeline {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .tl-node {
  position: relative;
  padding-bottom: 4px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -27px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--acid);
  box-shadow: 0 0 0 4px rgba(57, 255, 176, .14);
}

.page-about .tl-node--now::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 179, 71, .18);
}

.page-about .tl-year {
  display: inline-block;
  margin-bottom: 4px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--acid-soft);
}

.page-about .tl-node--now .tl-year {
  color: var(--amber);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.3;
}

.page-about .tl-more {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .team-total {
  margin: 0;
  font-size: clamp(64px, 12vw, 104px);
  font-weight: 700;
  line-height: .9;
  color: var(--acid);
  letter-spacing: -.03em;
}

.page-about .team-total span {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0;
}

.page-about .team-note {
  margin: 14px 0 0;
  max-width: 40ch;
  font-size: 14px;
  line-height: 1.8;
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 12px 0;
  border-block: 1px solid var(--line);
}

.page-about .filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.page-about .filter-status {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: .04em;
}

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

.page-about .role-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 18px;
  background: var(--ink-800);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-3px);
  border-color: var(--acid);
}

.page-about .role-card--tall {
  background: linear-gradient(180deg, var(--ink-800), var(--teal));
}

.page-about .role-card--accent {
  border: 1px solid var(--amber);
  background: transparent;
}

.page-about .role-count {
  display: block;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--acid);
}

.page-about .role-card--accent .role-count {
  display: none;
}

.page-about .role-mark {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .role-card h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
}

.page-about .role-card p {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.75;
}

.page-about .role-when {
  margin-top: auto;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
  padding-top: 10px;
  border-top: 1px dashed rgba(44, 90, 75, .9);
}

.page-about .is-filtered-out {
  display: none;
}

/* 合作生态 */
.page-about .section--network {
  background: var(--ink-900);
}

.page-about .network-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(24px, 3vw, 34px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .stat-block {
  padding: 16px 14px;
  background: var(--ink-800);
}

.page-about .stat-block:last-child {
  grid-column: 1 / -1;
}

.page-about .stat-num {
  display: block;
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--acid);
}

.page-about .stat-plus {
  color: var(--amber);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

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

.page-about .coop-list li {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .coop-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--acid-soft);
}

.page-about .coop-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

.page-about .network-side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .network-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .network-figure img {
  aspect-ratio: 10 / 7;
  filter: saturate(.6);
}

.page-about .network-figure .media-frame__caption {
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--ink-800);
}

.page-about .network-note {
  padding: 18px;
  border-radius: var(--radius-md);
}

.page-about .panel-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .network-note p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
}

.page-about .text-link {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--acid);
  text-decoration: none;
  border-bottom: 1px solid var(--acid);
  font-size: 13px;
}

.page-about .text-link:hover {
  color: var(--acid-soft);
}

/* 质量流程 */
.page-about .steps {
  display: grid;
  gap: 14px;
  margin: 0 0 clamp(28px, 4vw, 40px);
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.page-about .step {
  position: relative;
  padding: 18px;
  background: var(--ink-800);
  border-radius: var(--radius-md);
  border-top: 2px solid var(--acid);
}

.page-about .step--amber {
  border-top-color: var(--amber);
}

.page-about .step-no {
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--acid);
}

.page-about .step--amber .step-no {
  color: var(--amber);
}

.page-about .step h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
}

.page-about .step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
}

.page-about .quality-foot {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line);
}

.page-about .quality-foot .prose p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .quality-foot .prose a {
  color: var(--acid);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 255, 176, .5);
}

.page-about .quality-foot .prose a:hover {
  border-bottom-color: var(--acid);
}

.page-about .quality-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .quality-cta-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .role-card:focus-within,
.page-about .tab-link:focus-visible,
.page-about .text-link:focus-visible {
  outline: 2px solid var(--acid-soft);
  outline-offset: 3px;
}

@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .stat-block:last-child {
    grid-column: auto;
  }

  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .quality-foot {
    grid-template-columns: 1fr auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: 1.12fr .88fr;
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .hero-copy {
    padding-top: 10px;
  }

  .page-about .origin-grid {
    grid-template-columns: 1.05fr .95fr;
    align-items: start;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .timeline-wrap {
    padding: clamp(26px, 3vw, 40px) clamp(22px, 3vw, 36px);
  }

  .page-about .timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: var(--grid-gap);
    padding: 34px 0 0;
    border-left: 0;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 15px;
    height: 1px;
    background: var(--line);
  }

  .page-about .tl-node::before {
    top: -23px;
    left: 0;
  }

  .page-about .tl-more {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .2s var(--ease), opacity .2s var(--ease), margin .2s var(--ease);
  }

  .page-about .tl-node:hover .tl-more,
  .page-about .tl-node:focus-within .tl-more {
    max-height: 10em;
    margin-top: 4px;
    opacity: 1;
  }

  .page-about .team-grid {
    grid-template-columns: .9fr 1.1fr;
    align-items: start;
  }

  .page-about .team-summary {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .filter-bar {
    grid-column: 2;
    grid-row: 1;
    border-top: 0;
    padding-top: 0;
  }

  .page-about .role-grid {
    grid-column: 1 / -1;
    grid-row: 2;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .role-card--tall {
    margin-top: 18px;
  }

  .page-about .network-grid {
    grid-template-columns: 1.35fr .65fr;
    align-items: start;
  }

  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border-radius: var(--radius-md);
    overflow: hidden;
  }

  .page-about .step {
    border-radius: 0;
    border-top-width: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tab-link,
  .page-about .role-card,
  .page-about .tl-more {
    transition: none;
  }

  .page-about .role-card:hover {
    transform: none;
  }
}
<<<END>>>