.page-about{
  --ab-year: clamp(2.2rem, 7vw, 3.4rem);
  --ab-lime-glow: 0 0 0 1px rgba(199,255,61,.35), 0 0 24px rgba(199,255,61,.16);
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero{
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(115% 90% at 6% -10%, rgba(42,27,94,.9) 0%, rgba(18,7,38,0) 62%),
    radial-gradient(90% 75% at 102% 4%, rgba(55,215,255,.14) 0%, rgba(18,7,38,0) 58%),
    var(--void);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-hero::before{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}
.page-about .ab-hero-inner{
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 28px;
  padding-top: calc(var(--header-h) + 36px);
  padding-bottom: 44px;
}
.page-about .ab-hero-copy{ display: grid; gap: 18px; align-content: start; }
.page-about .ab-hero-copy .eyebrow{ color: var(--sky); }
.page-about .ab-hero h1{
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.85rem, 6.4vw, 3.35rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--mist);
  text-shadow: 0 0 26px rgba(199,255,61,.14);
  max-width: 20ch;
}
.page-about .ab-hero-lead{
  margin: 0;
  max-width: 56ch;
  color: var(--ash);
  font-size: 1rem;
  line-height: 1.8;
}
.page-about .ab-hero-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}
.page-about .ab-hero-wall{
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  box-shadow: 0 0 0 1px rgba(18,7,38,.9), 0 24px 60px -32px rgba(55,215,255,.5);
}
.page-about .ab-hero-wall img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-chip{
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  padding: 5px 10px;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--void);
  background: var(--lime);
}

/* 关键档案条 */
.page-about .ab-keys{
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .ab-keys li{
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  background: var(--void-2);
}
.page-about .ab-key-label{
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ash);
}
.page-about .ab-key-value{
  font-family: var(--font-mono);
  font-size: 1.3rem;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 档案目录条 ---------- */
.page-about .ab-index{
  background: var(--void-2);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-index-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-block: 12px;
}
.page-about .ab-index-list li{ flex: 0 0 auto; }
.page-about .ab-index-list a{
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border: 1px solid var(--line-soft);
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .25s var(--ease), color .25s var(--ease), background .25s var(--ease);
}
.page-about .ab-index-list a .mono{
  color: var(--sky);
  font-size: 11px;
  letter-spacing: .1em;
}
.page-about .ab-index-list a:hover,
.page-about .ab-index-list a:focus-visible{
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(199,255,61,.06);
}

/* ---------- 章节标题微调 ---------- */
.page-about .chapter{ margin-bottom: 26px; }
.page-about .chapter-no{
  font-family: var(--font-mono);
  color: var(--ember);
  letter-spacing: .16em;
}
.page-about .chapter-title{
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4.2vw, 2.1rem);
  line-height: 1.3;
  color: var(--mist);
  max-width: 26ch;
}

/* ---------- 01 起点 ---------- */
.page-about .ab-origin{ background: var(--void); }
.page-about .ab-origin-main p{
  margin: 0 0 16px;
  color: var(--ash);
  line-height: 1.85;
  max-width: 62ch;
}
.page-about .ab-origin-main p strong{
  color: var(--lime);
  font-weight: 600;
}
.page-about .ab-note{
  align-self: start;
  padding: 20px 20px 22px;
  background: var(--void-2);
  border: 1px solid var(--line);
}
.page-about .ab-note-label{
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--sky);
}
.page-about .ab-note-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-note-list li{
  display: grid;
  grid-template-columns: 32px minmax(0,1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ash);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-note-list li:last-child{ border-bottom: 0; padding-bottom: 0; }
.page-about .ab-note-list .mono{
  color: var(--ember);
  font-size: 12px;
  letter-spacing: .1em;
}

/* ---------- 02 三条主线 ---------- */
.page-about .ab-band--indigo{
  background:
    linear-gradient(180deg, rgba(42,27,94,.92) 0%, rgba(28,15,56,.96) 100%);
  border-block: 1px solid var(--line-soft);
}
.page-about .ab-line{
  display: grid;
  gap: 10px;
  padding: 26px 0 28px;
  border-top: 1px solid var(--line);
  transition: border-color .3s var(--ease);
}
.page-about .ab-line:last-child{ border-bottom: 1px solid var(--line); }
.page-about .ab-line-no{
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--sky);
}
.page-about .ab-line-title{
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.6vw, 1.5rem);
  color: var(--mist);
}
.page-about .ab-line-desc{
  margin: 0;
  max-width: 68ch;
  color: var(--ash);
  line-height: 1.85;
  font-size: .97rem;
}
.page-about .ab-line-link{
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}
.page-about .ab-line-link::after{ content: "→"; font-family: var(--font-body); }
.page-about .ab-line-link:hover,
.page-about .ab-line-link:focus-visible{
  border-color: var(--lime);
}

/* ---------- 03 时间轴 ---------- */
.page-about .ab-timeline-sec{ background: var(--void); }
.page-about .ab-timeline{
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-node{
  display: grid;
  gap: 8px;
  padding: 22px 0 24px;
  border-top: 1px solid var(--line-soft);
  position: relative;
}
.page-about .ab-node:last-child{ border-bottom: 1px solid var(--line-soft); }
.page-about .ab-node-year{
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--ab-year);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-node:last-child .ab-node-year{
  color: var(--ember);
  text-shadow: 0 0 26px rgba(255,155,69,.28);
}
.page-about .ab-node-body h3{
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--mist);
}
.page-about .ab-node-body p{
  margin: 0;
  color: var(--ash);
  line-height: 1.8;
  font-size: .95rem;
  max-width: 62ch;
}
.page-about .ab-node-extra{
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sky);
}

/* ---------- 04 团队 ---------- */
.page-about .ab-band--teal{
  background:
    linear-gradient(180deg, rgba(11,58,59,.94) 0%, rgba(18,7,38,.98) 100%);
  border-block: 1px solid var(--line-soft);
}
.page-about .ab-team-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 36px;
  align-items: start;
}
.page-about .ab-team-intro{
  margin: 0 0 20px;
  color: var(--ash);
  line-height: 1.85;
  max-width: 58ch;
}
.page-about .ab-team-list{
  border-top: 1px solid var(--line);
}
.page-about .ab-team{
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-team summary{
  display: grid;
  grid-template-columns: minmax(0,1fr) auto auto;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  color: var(--mist);
}
.page-about .ab-team summary::-webkit-details-marker{ display: none; }
.page-about .ab-team summary::after{
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--sky);
  transition: color .25s var(--ease);
}
.page-about .ab-team[open] summary::after{ content: "–"; color: var(--ember); }
.page-about .ab-team summary:hover .ab-team-name{ color: var(--lime); }
.page-about .ab-team-name{
  font-family: var(--font-mono);
  font-size: .98rem;
  transition: color .25s var(--ease);
}
.page-about .ab-team-num{
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-team-body{
  padding: 0 0 18px;
  color: var(--ash);
  font-size: .93rem;
  line-height: 1.8;
  max-width: 56ch;
}
.page-about .ab-team-right{ display: grid; gap: 28px; }
.page-about .ab-team-fig{
  margin: 0;
  border: 1px solid var(--line);
}
.page-about .ab-team-fig img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-steps-label{
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ember);
}
.page-about .ab-steps{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.page-about .ab-step{
  display: grid;
  grid-template-columns: 34px minmax(0,1fr);
  gap: 14px;
  padding-left: 4px;
  border-left: 1px solid var(--line);
  padding-bottom: 4px;
}
.page-about .ab-step-no{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ember);
  padding-left: 10px;
}
.page-about .ab-step-title{
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: .98rem;
  color: var(--mist);
}
.page-about .ab-step p{
  margin: 0;
  color: var(--ash);
  font-size: .93rem;
  line-height: 1.8;
}

/* ---------- 05 认证与合作 ---------- */
.page-about .ab-band--wine{
  background:
    linear-gradient(160deg, rgba(76,18,48,.94) 0%, rgba(28,15,56,.97) 70%);
  border-block: 1px solid var(--line-soft);
}
.page-about .ab-badge-copy p{
  margin: 0 0 16px;
  color: var(--mist);
  line-height: 1.85;
  font-size: .97rem;
  max-width: 60ch;
  opacity: .92;
}
.page-about .ab-badge-copy .btn{ margin-top: 8px; }
.page-about .ab-badge-fig{
  margin: 0;
  align-self: start;
  border: 1px solid rgba(199,255,61,.55);
  box-shadow: var(--ab-lime-glow);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease);
}
.page-about .ab-badge-fig img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-badge-fig:hover,
.page-about .ab-badge-fig:focus-within{
  transform: scale(1.03);
  box-shadow: 0 0 0 1px var(--lime), 0 0 36px rgba(199,255,61,.3);
}

/* ---------- 06 服务与备案 ---------- */
.page-about .ab-service{ background: var(--void); }
.page-about .ab-figures{
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .ab-figures li{
  background: var(--void-2);
  padding: 18px 16px;
  display: grid;
  gap: 8px;
}
.page-about .ab-figure-num{
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4.4vw, 1.75rem);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-figures li:nth-child(even) .ab-figure-num{ color: var(--sky); }
.page-about .ab-figure-label{
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ash);
}
.page-about .ab-sub-title{
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--mist);
}
.page-about .ab-service-bottom p{
  margin: 0 0 14px;
  color: var(--ash);
  line-height: 1.85;
  font-size: .95rem;
  max-width: 60ch;
}
.page-about .ab-service-links{
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 6px;
}
.page-about .ab-inline-link{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible{
  color: var(--lime);
  border-color: var(--lime);
}
.page-about .ab-contact{
  padding: 22px;
  background: var(--void-2);
  border: 1px solid var(--line);
  align-self: start;
}
.page-about .ab-contact .contact-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-contact .contact-item{
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-contact .contact-item:last-child{ border-bottom: 0; padding-bottom: 0; }
.page-about .ab-contact .contact-label{
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--ash);
}
.page-about .ab-contact .contact-value{
  font-family: var(--font-mono);
  font-size: .9rem;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}
.page-about .ab-contact-note{
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ash);
  padding-left: 12px;
  border-left: 2px solid var(--ember);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px){
  .page-about .ab-keys{ grid-template-columns: repeat(3, minmax(0,1fr)); }
  .page-about .ab-figures{ grid-template-columns: repeat(3, minmax(0,1fr)); }
  .page-about .ab-node-body h3{ font-size: 1.15rem; }
}

@media (min-width: 820px){
  .page-about .ab-node{
    grid-template-columns: 190px minmax(0,1fr);
    gap: 36px;
    align-items: start;
    padding: 26px 0 28px;
  }
  .page-about .ab-node-extra{
    margin-top: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    border-left-color: transparent;
    transition: max-height .4s var(--ease), opacity .35s var(--ease), margin-top .35s var(--ease);
  }
  .page-about .ab-node:hover .ab-node-extra,
  .page-about .ab-node:focus-within .ab-node-extra{
    max-height: 140px;
    opacity: 1;
    margin-top: 12px;
    border-left-color: var(--sky);
  }
  .page-about .ab-line{
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: 32px;
    align-items: start;
  }
  .page-about .ab-line-no{ grid-column: 1; grid-row: 1; }
  .page-about .ab-line-title{ grid-column: 2; grid-row: 1; }
  .page-about .ab-line-desc{ grid-column: 2; grid-row: 2; }
  .page-about .ab-line-link{ grid-column: 2; grid-row: 3; }
}

@media (min-width: 960px){
  .page-about .ab-hero-inner{
    grid-template-columns: minmax(0,7fr) minmax(0,5fr);
    grid-template-areas:
      "crumb crumb"
      "copy wall"
      "keys keys";
    column-gap: 48px;
    row-gap: 36px;
    padding-top: calc(var(--header-h) + 52px);
    padding-bottom: 56px;
  }
  .page-about .ab-hero-inner .breadcrumb{ grid-area: crumb; }
  .page-about .ab-hero-copy{ grid-area: copy; }
  .page-about .ab-hero-wall{ grid-area: wall; }
  .page-about .ab-keys{ grid-area: keys; grid-template-columns: repeat(5, minmax(0,1fr)); }
  .page-about .ab-team-grid{ grid-template-columns: minmax(0,6fr) minmax(0,5fr); gap: 48px; }
  .page-about .ab-figures{ grid-template-columns: repeat(5, minmax(0,1fr)); }
  .page-about .ab-index-list{ justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce){
  .page-about .ab-node-extra{ transition: none; }
  .page-about .ab-badge-fig{ transition: none; }
  .page-about .ab-badge-fig:hover,
  .page-about .ab-badge-fig:focus-within{ transform: none; }
  .page-about .ab-line-link,
  .page-about .ab-index-list a,
  .page-about .ab-inline-link{ transition: none; }
}
<<<END>>>