.page-about {
  --about-warm: rgba(244, 183, 74, 0.14);
  background: var(--void);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(1.8rem, 5vw, 3.4rem) clamp(2.4rem, 6vw, 4.2rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(92% 74% at 82% 4%, rgba(53, 242, 200, 0.12), transparent 64%),
    linear-gradient(180deg, var(--hull) 0%, var(--void) 84%);
}

.page-about .ab-hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .ab-hero-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: saturate(0.6);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.14;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 72%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 72%);
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.85rem;
}

.page-about .ab-hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 15em;
  color: var(--paper);
}

.page-about .ab-hl {
  color: var(--teal);
}

.page-about .ab-hero-lede {
  max-width: 34em;
  color: var(--muted);
  line-height: 1.85;
  font-size: clamp(0.94rem, 2.6vw, 1.02rem);
}

.page-about .ab-hero-note {
  margin: 0.6rem 0 0;
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  color: var(--muted);
  opacity: 0.8;
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  background: var(--hull);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-index-list {
  display: flex;
  gap: 0.35rem 1.5rem;
  overflow-x: auto;
  padding-block: 0.8rem;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-index-link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-index-link:hover,
.page-about .ab-index-link[aria-current="true"] {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

.page-about .ab-index-link:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* ---------- 区块骨架 ---------- */
.page-about .ab-section {
  padding-block: clamp(2.4rem, 6vw, 4.4rem);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-sec-head {
  display: grid;
  gap: 0.65rem;
  max-width: 44rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.6rem);
}

.page-about .ab-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-sec-lede {
  margin: 0;
  max-width: 33em;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.85;
}

/* ---------- 历程轨道 ---------- */
.page-about .ab-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.45rem;
  display: grid;
  gap: 1.15rem;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 0.25rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--teal), var(--amber) 62%, transparent);
  opacity: 0.55;
}

.page-about .ab-node {
  position: relative;
  display: grid;
  gap: 0.55rem;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 0.55rem;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--void);
  border: 1px solid var(--teal);
  box-shadow: 0 0 0 4px var(--glow);
}

.page-about .ab-node-mark {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.page-about .ab-node-year {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 3.2vw, 1.45rem);
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--amber);
}

.page-about .ab-node-card {
  background: var(--hull);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(0.95rem, 2.8vw, 1.45rem);
}

.page-about .ab-node:nth-child(2n) .ab-node-card {
  background: var(--panel);
}

.page-about .ab-node-card h3 {
  margin: 0 0 0.45rem;
  font-size: clamp(1rem, 2.5vw, 1.16rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .ab-node-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.85;
}

.page-about .fold {
  margin-top: 0.85rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line);
}

.page-about .fold summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--teal);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

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

.page-about .fold summary::after {
  content: "＋";
  font-size: 0.85rem;
}

.page-about .fold[open] summary::after {
  content: "－";
}

.page-about .fold summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.page-about .fold-body {
  padding-top: 0.55rem;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.85;
}

/* ---------- 内容体系 ---------- */
.page-about .ab-system {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .ab-layers {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-layer {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: 0.85rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-layer-num {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--teal);
  padding-top: 0.25rem;
}

.page-about .ab-layer h3 {
  margin: 0 0 0.28rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-layer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.85;
}

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

.page-about .ab-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--hull);
}

.page-about .ab-figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 编辑与校对 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .ab-role {
  border-left: 2px solid var(--amber);
  padding-left: 0.85rem;
}

.page-about .ab-role h3 {
  margin: 0 0 0.3rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-role p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-stats {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-stat {
  background: var(--hull);
  padding: clamp(1rem, 3.4vw, 1.6rem);
  display: grid;
  gap: 0.4rem;
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7vw, 2.8rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .ab-stat-label {
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-coverage-note {
  margin: 1.3rem 0 0;
  max-width: 36em;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.85;
  padding-left: 0.9rem;
  border-left: 2px solid var(--teal);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .ab-mini-title {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .ab-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .ab-honors li {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 0.85rem;
  align-items: baseline;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-honor-year {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .ab-honors p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-partner-list {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .ab-partner-list li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.8;
}

.page-about .ab-partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.45rem;
  height: 1px;
  background: var(--teal);
}

.page-about .ab-inline-btn {
  display: inline-block;
}

/* ---------- 服务承诺 ---------- */
.page-about .ab-promises {
  display: grid;
  gap: 0.9rem;
}

.page-about .ab-promise {
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(155deg, var(--panel), var(--hull) 78%);
}

.page-about .ab-promise h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-promise p {
  margin: 0 0 0.6rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.85;
}

.page-about .ab-text-link {
  display: inline-block;
  font-size: 0.84rem;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

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

.page-about .ab-text-link:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.page-about .ab-cta {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  padding: clamp(1.1rem, 3.4vw, 1.8rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(80% 120% at 6% 0%, var(--about-warm), transparent 62%),
    var(--hull);
  display: grid;
  gap: 1rem;
}

.page-about .ab-cta-text {
  margin: 0;
  max-width: 32em;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .ab-roles {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-promises {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .ab-hero-note {
    letter-spacing: 0.4em;
  }
}

@media (min-width: 860px) {
  .page-about .ab-track {
    padding-left: 0;
    gap: 1.35rem;
  }

  .page-about .ab-track::before {
    left: 6.2rem;
    top: 1.4rem;
    bottom: 1rem;
  }

  .page-about .ab-node {
    grid-template-columns: 6rem minmax(0, 1fr);
    column-gap: 2.2rem;
    row-gap: 0;
    align-items: start;
  }

  .page-about .ab-node::before {
    left: 5.9rem;
    top: 0.72rem;
  }

  .page-about .ab-node-mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding-top: 0.5rem;
  }

  .page-about .ab-hero-inner {
    padding-right: 3.5rem;
  }

  .page-about .ab-hero-note {
    position: absolute;
    right: 0;
    top: 2.4rem;
    writing-mode: vertical-rl;
    margin: 0;
  }
}

@media (min-width: 920px) {
  .page-about .ab-system {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

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

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.4rem;
  }
}
<<<PAGE_CSS_END>>>