.page-about {
  --ab-fg: var(--bone);
  --ab-dim: var(--dim);
  --ab-pad: clamp(3.25rem, 8vw, 6.5rem);
  background: var(--ink);
  color: var(--mist);
  overflow-x: clip;
}

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

.page-about .ab-h2 {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(1.75rem, 4.6vw, 3.1rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ab-fg);
  margin: 0.5rem 0 0.9rem;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--yellow);
  margin: 0;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--header-offset) + clamp(1.5rem, 5vw, 3rem)) 0 clamp(2.75rem, 7vw, 4.5rem);
  isolation: isolate;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(70%, 820px);
  height: 100%;
  background: linear-gradient(142deg, var(--moss) 0%, #3C4536 48%, var(--clay) 100%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.3;
  z-index: -1;
}

.page-about .ab-hero-inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--dim);
  margin-bottom: 1.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line-hi);
}

.page-about .breadcrumbs a:hover {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}

.page-about .ab-display {
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: clamp(2.1rem, 8.6vw, 6rem);
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--bone);
  margin: 0.8rem 0 1.3rem;
}

.page-about .ab-display strong {
  font-weight: 900;
  color: var(--yellow);
  letter-spacing: -0.04em;
}

.page-about .ab-lede {
  max-width: 46ch;
  font-size: clamp(0.98rem, 1.6vw, 1.1rem);
  line-height: 1.75;
  color: var(--mist);
  margin: 0 0 1.75rem;
}

.page-about .ab-toc {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.4rem;
  scrollbar-width: thin;
}

.page-about .ab-toc a {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-capsule);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.page-about .ab-toc a:hover,
.page-about .ab-toc a:focus-visible {
  border-color: var(--red);
  background: var(--panel);
  color: var(--bone);
}

.page-about .ab-hero-card {
  background: var(--bone);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard-lg);
  padding: 1.1rem 1.1rem 1.35rem;
  align-self: start;
}

.page-about .ab-card-title {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: #5A636B;
  margin: 0 0 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--ink);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.75rem;
  margin: 0;
}

.page-about .ab-fact dt {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: #5A636B;
  margin-bottom: 0.2rem;
}

.page-about .ab-fact dd {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.page-about .ab-fact dd span {
  font-size: 0.62rem;
  font-weight: 500;
  margin-left: 0.15rem;
  color: #5A636B;
}

/* ---------- 起点 ---------- */
.page-about .ab-origin {
  --ab-fg: var(--ink);
  background: var(--bone);
  color: #2A3036;
  padding: var(--ab-pad) 0;
}

.page-about .ab-origin .eyebrow,
.page-about .ab-audience .eyebrow {
  color: var(--clay);
}

.page-about .ab-split {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3.25rem);
}

.page-about .ab-lead-p {
  font-size: clamp(1rem, 1.7vw, 1.12rem);
  line-height: 1.8;
  color: #1D2329;
  margin: 0 0 1rem;
}

.page-about .ab-split-text > p:not(.eyebrow):not(.ab-lead-p) {
  line-height: 1.8;
  margin: 0 0 1.5rem;
  color: #3A4249;
}

.page-about .ab-points {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .ab-points li {
  display: grid;
  gap: 0.2rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid rgba(11, 13, 15, 0.16);
}

.page-about .ab-points b {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-points span {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #4A525A;
}

.page-about .ab-figure {
  margin: 0;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--panel);
}

.page-about .ab-figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .ab-figure figcaption {
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  padding: 0.6rem 0.8rem;
  border-top: 1px solid var(--line);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  padding: var(--ab-pad) 0;
  background: var(--ink);
  isolation: isolate;
}

.page-about .ab-track-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.13;
  z-index: -1;
}

.page-about .ab-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .ab-sub {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--dim);
  margin: 0;
}

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

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 4px;
  background: linear-gradient(180deg, var(--red), var(--yellow) 42%, var(--teal));
  opacity: 0.6;
}

.page-about .ab-node {
  position: relative;
  padding-left: 3.1rem;
  margin-bottom: 1.1rem;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 1.5rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 4px solid var(--yellow);
  transform: translateX(-50%);
  box-sizing: content-box;
}

.page-about .ab-node-body {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 8px solid var(--moss);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.2s, transform 0.2s;
}

.page-about .ab-node-body:hover {
  transform: translateY(-2px);
  border-color: var(--line-hi);
  border-left-color: var(--yellow);
}

.page-about .ab-node-body > summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: auto 1fr auto;
  column-gap: 0.9rem;
  row-gap: 0.35rem;
  align-items: center;
  padding: 1rem 1rem 1.05rem;
}

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

.page-about .ab-node-body > summary::after {
  content: "+";
  grid-column: 3;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--yellow);
}

.page-about .ab-node-body[open] > summary::after {
  content: "−";
}

.page-about .ab-node-body[open] {
  border-left-color: var(--red);
}

.page-about .ab-node-idx {
  grid-row: 1 / span 2;
  grid-column: 1;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--dim);
  letter-spacing: 0.06em;
}

.page-about .ab-node-title {
  grid-column: 2;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .ab-node-meta {
  grid-column: 2;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.page-about .ab-node-more {
  padding: 0 1rem 1.15rem;
  border-top: 1px dashed var(--line);
}

.page-about .ab-node-more p {
  margin: 0.9rem 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  --ab-fg: var(--ink);
  background: var(--bone);
  color: #2A3036;
  padding: var(--ab-pad) 0;
}

.page-about .ab-team .eyebrow {
  color: var(--moss);
}

.page-about .ab-team .ab-sub {
  color: #4A525A;
}

.page-about .ab-team-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
}

.page-about .ab-team-viz {
  background: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: 1rem;
}

.page-about .ab-svg {
  width: 100%;
  height: auto;
  display: block;
  color: var(--line-hi);
}

.page-about .ab-svg-t {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  fill: var(--bone);
}

.page-about .ab-svg-s {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  fill: var(--dim);
}

.page-about .ab-roles {
  display: grid;
  gap: 0.7rem;
}

.page-about .ab-role {
  border: 2px solid var(--ink);
  background: #FFFDF6;
  box-shadow: 4px 4px 0 rgba(11, 13, 15, 0.14);
}

.page-about .ab-role > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.8rem;
  padding: 0.85rem 1rem;
}

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

.page-about .ab-role-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-role-meta {
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: #5A636B;
  margin-left: auto;
}

.page-about .ab-role[open] > summary {
  border-bottom: 2px solid var(--ink);
}

.page-about .ab-role ul {
  margin: 0;
  padding: 0.9rem 1rem 1rem 1.9rem;
  display: grid;
  gap: 0.5rem;
}

.page-about .ab-role li {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #3A4249;
}

.page-about .ab-team-foot {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 2px solid var(--ink);
}

.page-about .ab-figure--tight {
  box-shadow: 4px 4px 0 rgba(11, 13, 15, 0.18);
  border-color: var(--ink);
}

.page-about .ab-team-note h3 {
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 0.8rem;
  line-height: 1.3;
}

.page-about .ab-team-note p {
  margin: 0 0 0.9rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: #3A4249;
}

/* ---------- 归档 ---------- */
.page-about .ab-archive {
  padding: var(--ab-pad) 0;
  background: var(--ink);
}

.page-about .ab-archive-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-archive-list {
  display: grid;
  gap: 0;
}

.page-about .ab-archive-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-archive-item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .ab-archive-key {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border: 2px solid var(--clay);
  color: var(--clay);
  font-size: 0.85rem;
  font-weight: 700;
  transform: rotate(-4deg);
}

.page-about .ab-archive-item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .ab-archive-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-archive-link {
  margin: 1.25rem 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--dim);
  padding-left: 0.9rem;
  border-left: 4px solid var(--red);
}

.page-about .ab-archive-link a {
  color: var(--yellow);
  text-decoration: none;
  border-bottom: 1px solid var(--yellow);
}

.page-about .ab-archive-link a:hover {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

.page-about .ab-stat-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 8px solid var(--red);
  box-shadow: var(--shadow-hard);
  padding: 1.15rem 1.1rem 1.35rem;
}

.page-about .ab-panel-title {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--dim);
  margin: 0 0 1rem;
}

.page-about .ab-stat-panel .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 0.75rem;
}

.page-about .ab-stat-panel .stat {
  display: grid;
  gap: 0.25rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--line);
}

.page-about .ab-stat-panel .stat-value {
  font-size: clamp(1.6rem, 4.5vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--bone);
  letter-spacing: -0.02em;
}

.page-about .ab-stat-panel .stat-value--yellow {
  color: var(--yellow);
}

.page-about .ab-stat-panel .stat-value--teal {
  color: var(--teal);
}

.page-about .ab-stat-panel .stat-value--red {
  color: var(--red);
}

.page-about .ab-stat-panel .stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.page-about .ab-panel-note {
  margin: 1.25rem 0 0;
  padding-top: 1rem;
  border-top: 1px dashed var(--line);
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务对象 ---------- */
.page-about .ab-audience {
  --ab-fg: var(--ink);
  background: #EFEADB;
  color: #2A3036;
  padding: var(--ab-pad) 0;
  border-top: 8px solid var(--clay);
}

.page-about .ab-rows {
  display: grid;
  gap: 0;
}

.page-about .ab-row {
  display: grid;
  gap: 0.5rem;
  padding: 1.4rem 0;
  border-top: 1px solid rgba(11, 13, 15, 0.2);
}

.page-about .ab-row:last-child {
  border-bottom: 1px solid rgba(11, 13, 15, 0.2);
}

.page-about .ab-row-num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--clay);
}

.page-about .ab-row h3 {
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 700;
  margin: 0;
  color: var(--ink);
  line-height: 1.25;
}

.page-about .ab-row p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: #3F474E;
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  padding: var(--ab-pad) 0;
  background:
    linear-gradient(115deg, rgba(226, 58, 46, 0.14) 0%, rgba(11, 13, 15, 0) 46%),
    var(--panel-2);
}

.page-about .ab-next-inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  align-items: start;
}

.page-about .ab-next-text p {
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--mist);
  margin: 0 0 1rem;
  max-width: 60ch;
}

.page-about .ab-next-text a:not(.btn) {
  color: var(--yellow);
  text-decoration: none;
  border-bottom: 1px solid var(--yellow);
}

.page-about .ab-next-text a:not(.btn):hover {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.page-about .ab-next-mark {
  display: grid;
  justify-items: start;
  gap: 0.6rem;
  padding: 1.1rem;
  border: 2px solid var(--line);
  border-left: 8px solid var(--yellow);
  background: var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-next-year {
  font-size: clamp(2.4rem, 9vw, 4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--bone);
  letter-spacing: -0.04em;
}

.page-about .ab-next-line {
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--red), var(--yellow), var(--teal));
}

.page-about .ab-next-cap {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .ab-archive-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .ab-team-foot {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: center;
  }

  .page-about .ab-row {
    grid-template-columns: 4rem minmax(0, 12rem) minmax(0, 1fr);
    align-items: start;
    gap: 1.25rem;
    padding: 1.6rem 0;
  }

  .page-about .ab-row-num {
    padding-top: 0.35rem;
  }

  .page-about .ab-next-inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.4fr);
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: end;
    gap: 3rem;
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .ab-toc {
    overflow-x: visible;
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node-body,
  .page-about .ab-toc a {
    transition: none;
  }

  .page-about .ab-node-body:hover {
    transform: none;
  }
}
<<<END>>>