.page-about {
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(40px, 7vw, 76px) 0 clamp(40px, 6vw, 72px);
  isolation: isolate;
  overflow: hidden;
}

.page-about .ab-hero-shape {
  position: absolute;
  top: -18%;
  right: -14%;
  width: min(88vw, 720px);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 34% 36%, rgba(255, 106, 69, 0.24), transparent 58%),
    radial-gradient(circle at 68% 66%, rgba(34, 227, 206, 0.18), transparent 62%);
  border-radius: 46% 54% 38% 62% / 52% 40% 60% 48%;
  transform: rotate(-14deg);
  z-index: -1;
  pointer-events: none;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(34, 227, 206, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 227, 206, 0.09) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 82%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 82%);
  z-index: -1;
  pointer-events: none;
}

.page-about .ab-hero-inner {
  position: relative;
}

.page-about .ab-hero-kicker {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-hero-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.35rem, 8.2vw, 4.6rem);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -0.02em;
  max-width: 18ch;
}

.page-about .ab-hero-title em {
  font-style: normal;
  color: var(--coral);
}

.page-about .ab-hero-lead {
  margin: 22px 0 0;
  max-width: 36ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  opacity: 0.88;
}

.page-about .ab-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  overflow: hidden;
}

.page-about .ab-hero-stats li {
  background: var(--panel);
  padding: 16px 16px 18px;
}

.page-about .ab-stat-num {
  display: block;
  font-size: clamp(1.4rem, 4.6vw, 2rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .ab-stat-key {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: clamp(44px, 8vw, 88px) 0;
}

.page-about .ab-chapter--panel {
  background: var(--panel);
}

.page-about .ab-chapter--band {
  background:
    linear-gradient(160deg, var(--panel) 0%, var(--ink) 68%);
  border-top: 1px solid var(--line);
}

.page-about .ab-ch-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 10px 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(22px, 4vw, 34px);
}

.page-about .ab-ch-num {
  font-size: clamp(0.9rem, 2vw, 1.05rem);
  color: var(--cyan);
  letter-spacing: 0.14em;
}

.page-about .ab-ch-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 4.4vw, 2.35rem);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .ab-ch-body p,
.page-about .prose p {
  margin: 0;
  max-width: 40ch;
  line-height: 1.85;
}

.page-about .ab-ch-body p + p,
.page-about .prose p + p {
  margin-top: 16px;
}

.page-about .ab-lead {
  margin: 0 0 clamp(20px, 4vw, 30px);
  max-width: 42ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--cyan-soft);
}

.page-about .ab-note {
  margin: clamp(20px, 4vw, 32px) 0 0;
  padding: 10px 0 10px 18px;
  border-left: 2px solid var(--coral);
  max-width: 30ch;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--coral-soft);
}

/* ---------- 图 ---------- */
.page-about .ab-figure {
  margin: clamp(24px, 4vw, 38px) 0 0;
}

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--panel-2);
  border-radius: var(--radius-organic);
  border: 1px solid var(--line);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 02 覆盖范围 ---------- */
.page-about .ab-cover-grid {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .ab-cover-text p {
  max-width: 38ch;
  line-height: 1.85;
}

.page-about .ab-index {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-index-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 16px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-index-row:hover {
  border-bottom-color: var(--cyan);
  background: rgba(34, 227, 206, 0.05);
}

.page-about .ab-index-row dt {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .ab-index-row dd {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text);
}

/* ---------- 03 校对流程 ---------- */
.page-about .ab-two-col {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .ab-two-col-text p {
  max-width: 40ch;
  line-height: 1.85;
}

.page-about .ab-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
}

.page-about .ab-step-key {
  font-size: 0.85rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .ab-step-text {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text);
}

.page-about .ab-step-text strong {
  color: var(--cyan-soft);
  font-weight: 600;
  margin-right: 4px;
}

.page-about .ab-after-steps {
  margin-top: 20px;
}

/* ---------- 04 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin-top: clamp(24px, 4vw, 36px);
  padding-left: 34px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan) 0%, var(--line) 58%, rgba(32, 86, 111, 0) 100%);
}

.page-about .ab-node {
  position: relative;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-sizing: content-box;
}

.page-about .ab-node details {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 4px 14px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--cyan);
}

.page-about .ab-node details[open] summary::after {
  content: "–";
}

.page-about .ab-node details[open] summary {
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-node-title {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 1rem;
  font-weight: 600;
}

.page-about .ab-node-ver {
  font-size: 0.85rem;
  color: var(--cyan);
  letter-spacing: 0.08em;
}

.page-about .ab-node-name {
  color: var(--text);
}

.page-about .ab-node details p {
  margin: 0;
  padding: 12px 0 18px;
  max-width: 38ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 05 团队与生态 ---------- */
.page-about .ab-team-grid {
  display: grid;
  gap: 14px;
}

.page-about .ab-team-card {
  padding: 20px 18px 22px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
}

.page-about .ab-team-num {
  display: block;
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-team-card h3 {
  margin: 12px 0 6px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .ab-team-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-eco {
  list-style: none;
  margin: clamp(20px, 4vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-eco li {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background: var(--panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-eco li:hover {
  border-color: var(--cyan);
  background: rgba(34, 227, 206, 0.07);
}

.page-about .ab-eco-key {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .ab-eco-text {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 06 服务范围 ---------- */
.page-about .ab-band {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  overflow: hidden;
}

.page-about .ab-band-cell {
  background: var(--ink);
  padding: 20px 18px 22px;
}

.page-about .ab-band-cell--accent {
  background: linear-gradient(150deg, rgba(255, 106, 69, 0.22), rgba(5, 18, 30, 0.9) 72%);
}

.page-about .ab-band-num {
  display: block;
  font-size: clamp(1.25rem, 4.2vw, 1.75rem);
  line-height: 1.15;
  color: var(--cyan);
}

.page-about .ab-band-cell--accent .ab-band-num {
  color: var(--coral-soft);
}

.page-about .ab-band-key {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-band-note {
  margin-top: clamp(20px, 4vw, 28px);
  max-width: 44ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--cyan-soft);
}

/* ---------- 收束入口 ---------- */
.page-about .ab-cta {
  padding: clamp(44px, 7vw, 76px) 0 clamp(52px, 8vw, 92px);
}

.page-about .ab-cta-title {
  margin: 0 0 clamp(20px, 4vw, 30px);
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 4.4vw, 2.2rem);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .ab-cta-grid {
  display: grid;
  gap: 12px;
}

.page-about .ab-cta-card {
  display: block;
  padding: 20px 18px 22px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background: var(--panel);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-cta-card:hover,
.page-about .ab-cta-card:focus-visible {
  border-color: var(--cyan);
  background: var(--panel-2);
  transform: translateY(-2px);
}

.page-about .ab-cta-key {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-cta-card h3 {
  margin: 10px 0 8px;
  font-size: 1.05rem;
  font-weight: 600;
}

.page-about .ab-cta-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .ab-eco li {
    grid-template-columns: minmax(0, 168px) minmax(0, 1fr);
    gap: 4px 20px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-title {
    max-width: 15ch;
  }

  .page-about .ab-cover-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

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

  .page-about .ab-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-chapter--panel .ab-figure--flush {
    margin-bottom: 8px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-timeline {
    padding-left: 56px;
  }

  .page-about .ab-timeline::before {
    left: 14px;
  }

  .page-about .ab-node::before {
    left: -47px;
    top: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cta-card:hover,
  .page-about .ab-cta-card:focus-visible {
    transform: none;
  }
}
<<<END>>>