.page-about {
  --ab-rail-w: 4px;
  --ab-num-size: clamp(3.25rem, 8vw, 6rem);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.85;
  overflow-x: hidden;
}

.page-about .ab-wrap {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) var(--gutter) clamp(2.5rem, 7vw, 5rem);
}

.page-about .ab-wrap::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--gutter) * 0.34);
  width: var(--ab-rail-w);
  background-image: repeating-linear-gradient(
    to bottom,
    var(--rule) 0 14px,
    transparent 14px 34px
  );
  opacity: 0.75;
  pointer-events: none;
}

/* 面包屑 */
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--rule);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

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

/* 通用区块 */
.page-about .ab-section {
  padding-left: clamp(0.5rem, 1.8vw, 1.25rem);
  margin-top: clamp(3rem, 8vw, 5.5rem);
}

.page-about .ab-head {
  position: relative;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
  isolation: isolate;
}

.page-about .ab-num {
  position: absolute;
  top: -0.45em;
  right: 0;
  font-family: var(--font-mono);
  font-size: var(--ab-num-size);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
  opacity: 0.13;
  pointer-events: none;
  user-select: none;
}

.page-about .eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-head h2 {
  position: relative;
  margin: 0 0 1rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 0.035em;
  color: var(--paper);
}

.page-about .ab-head h2::before {
  content: "";
  position: absolute;
  left: -0.4rem;
  right: 25%;
  top: 0.14em;
  bottom: 0.16em;
  background: linear-gradient(90deg, rgba(53, 240, 208, 0.16), rgba(53, 240, 208, 0));
  z-index: -1;
}

.page-about .ab-sub {
  margin: 0;
  max-width: 36em;
  color: var(--muted);
  font-size: var(--fs-body);
}

.page-about h3 {
  margin: 0 0 0.6rem;
  font-size: var(--fs-h4);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about p {
  margin: 0 0 0.9rem;
  max-width: 38em;
}

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

.page-about .ab-note {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted-deep);
  max-width: 34em;
}

.page-about .ab-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

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

/* 标签 */
.page-about .ab-tag {
  display: inline-block;
  margin-bottom: 0.9rem;
  padding: 0.22rem 0.6rem;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.14em;
}

.page-about .ab-tag--dim {
  background: var(--cyan-dim);
  color: var(--ink);
}

.page-about .ab-tag--amber {
  background: var(--amber);
  color: var(--ink);
}

/* 首屏 */
.page-about .ab-hero {
  margin-top: 0;
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}

.page-about .ab-vertical {
  display: none;
}

.page-about .ab-hero h1 {
  margin: 0 0 1.25rem;
  font-size: var(--fs-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .ab-lead {
  max-width: 32em;
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  line-height: 1.8;
  color: var(--paper);
}

.page-about .ab-hero-body {
  max-width: 34em;
  color: var(--muted);
  font-size: var(--fs-note);
  line-height: 1.9;
}

.page-about .ab-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.25rem;
  margin: 1.5rem 0 0;
  padding: 1.25rem 0 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .ab-facts li {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .ab-facts .mono {
  display: block;
  margin-bottom: 0.15rem;
  font-size: 1.15rem;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* 图片 */
.page-about .ab-fig {
  position: relative;
  margin: 0;
}

.page-about .ab-fig::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 42%;
  background: var(--cyan);
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  background: var(--ink-soft);
}

.page-about .ab-fig figcaption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.06em;
  color: var(--muted-deep);
}

/* 方法三卡 */
.page-about .ab-method-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .ab-method-card {
  background: var(--ink);
  padding: clamp(1.25rem, 3vw, 2rem);
  transition: background 200ms var(--ease);
}

.page-about .ab-method-card:hover {
  background: var(--ink-soft);
}

.page-about .ab-method-card p {
  color: var(--muted);
  font-size: var(--fs-note);
  line-height: 1.9;
}

.page-about .ab-method-card h3 {
  font-size: var(--fs-h4);
}

/* 团队 */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .ab-grid36 {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
  max-width: 360px;
}

.page-about .ab-grid36 .ab-cell {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--rule);
}

.page-about .ab-cell--ops {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .ab-cell--dev {
  background: rgba(53, 240, 208, 0.16);
  border-color: var(--cyan-dim);
}

.page-about .ab-cell--cs::after {
  content: "";
  position: absolute;
  inset: 32%;
  background: var(--amber);
}

.page-about .ab-legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
  font-size: var(--fs-note);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 0.55rem;
  vertical-align: middle;
}

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

.page-about .ab-dot--dev {
  background: rgba(53, 240, 208, 0.16);
  border: 1px solid var(--cyan-dim);
}

.page-about .ab-dot--cs {
  border: 1px solid var(--amber);
}

.page-about .ab-team-text p {
  color: var(--muted);
  font-size: var(--fs-note);
  line-height: 1.9;
}

/* 时间线 */
.page-about .ab-tl-panel {
  background: linear-gradient(160deg, var(--ink-soft), rgba(18, 38, 58, 0.55));
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 2.25rem);
}

.page-about .ab-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.75rem;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0.7rem;
  bottom: 0.7rem;
  width: 1px;
  background: var(--rule);
}

.page-about .ab-tl-item {
  position: relative;
  padding-bottom: 1.15rem;
}

.page-about .ab-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .ab-tl-dot {
  position: absolute;
  left: calc(-1.75rem + 2.5px);
  top: 0.62rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-soft);
  border: 1px solid var(--cyan);
}

.page-about .ab-tl-dot--now {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .ab-tl-details summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.9rem;
  padding: 0.3rem 0;
  cursor: pointer;
  list-style: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms var(--ease);
}

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

.page-about .ab-tl-details summary:hover,
.page-about .ab-tl-details summary:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .ab-tl-year {
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .ab-tl-name {
  font-size: var(--fs-note);
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .ab-tl-details p {
  margin: 0.65rem 0 0;
  font-size: var(--fs-note);
  line-height: 1.85;
  color: var(--muted);
  max-width: 36em;
}

.page-about .ab-tl-fig {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-tl-more {
  margin-top: 1.25rem;
}

/* 收录标准 */
.page-about .ab-std-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .ab-rules {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rule;
}

.page-about .ab-rules li {
  position: relative;
  counter-increment: rule;
  padding: 1.1rem 0 1.1rem 3.1rem;
  border-top: 1px solid var(--rule);
}

.page-about .ab-rules li:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-rules li::before {
  content: "0" counter(rule);
  position: absolute;
  left: 0;
  top: 1.2rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .ab-rules h3 {
  font-size: var(--fs-h4);
}

.page-about .ab-rules p {
  color: var(--muted);
  font-size: var(--fs-note);
  line-height: 1.9;
}

.page-about .ab-std-more {
  margin-top: 1.5rem;
}

/* 收尾 */
.page-about .ab-outro {
  margin-top: clamp(3rem, 8vw, 5rem);
  padding: clamp(1.75rem, 4vw, 2.75rem) clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--rule);
  background: linear-gradient(180deg, var(--shadow), var(--ink));
}

.page-about .ab-outro h2 {
  margin: 0 0 0.9rem;
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.page-about .ab-outro p {
  color: var(--muted);
  font-size: var(--fs-note);
  line-height: 1.9;
}

.page-about .ab-outro-call {
  margin-top: 1.25rem;
  color: var(--amber) !important;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.06em;
}

.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.page-about .ab-top {
  display: inline-block;
  margin-top: 1.75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.1em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms var(--ease);
}

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

/* 平板与桌面 */
@media (min-width: 640px) {
  .page-about .ab-grid36 {
    grid-template-columns: repeat(9, 1fr);
  }

  .page-about .ab-method-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(1.5rem, 3vw, 2.75rem);
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .ab-std-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-hero-grid {
    grid-template-columns: 26px minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .ab-vertical {
    display: block;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    margin: 0;
    padding-top: 0.4rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.34em;
    color: var(--muted-deep);
    white-space: nowrap;
  }

  .page-about .ab-head h2::before {
    right: 45%;
  }
}
<<<END>>>