.page-about {
  --about-note-w: 210px;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 0;
}

.page-about .about-hero {
  padding: clamp(28px, 5vw, 56px) 0 clamp(30px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 80% at 90% -10%, rgba(22, 140, 126, 0.16), transparent 60%),
    radial-gradient(90% 70% at 6% 0%, rgba(199, 53, 44, 0.14), transparent 62%);
}

.page-about .about-title {
  margin: 18px 0 0;
  font-size: clamp(34px, 7.2vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--c-ivory);
}

.page-about .about-lede {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 38em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .about-facts strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ivory);
  margin-right: 2px;
}

.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(28px, 4vw, 48px) 0 clamp(48px, 7vw, 96px);
}

/* 章节索引 */
.page-about .toc-title {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about .toc-list {
  list-style: none;
  display: flex;
  gap: 0;
  margin: 10px 0 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px 9px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text-dim);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .toc-num {
  font-size: 11px;
  color: var(--c-gold);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--c-ivory);
  border-bottom-color: var(--c-gold);
}

/* 章节 */
.page-about .chapter {
  padding: clamp(30px, 5vw, 64px) 0;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--topbar) + 20px);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter-index {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-gold);
}

.page-about .chapter-main {
  min-width: 0;
}

.page-about .chapter-main h2 {
  margin: 0 0 clamp(16px, 2.5vw, 24px);
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.2;
  color: var(--c-ivory);
}

.page-about .chapter-main h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--c-ivory);
}

.page-about .chapter-intro {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 40em;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .chapter-cols {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .prose p {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-ivory);
}

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

.page-about .chapter-note {
  border-top: 2px solid var(--c-red);
  padding-top: 12px;
  align-self: start;
}

.page-about .note-num {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 5vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-red-lit);
}

.page-about .note-text {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .chapter-foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--c-turq);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 42em;
}

.page-about .chapter-foot a {
  color: var(--c-gold-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(214, 161, 60, 0.5);
}

.page-about .chapter-foot a:hover,
.page-about .chapter-foot a:focus-visible {
  color: var(--c-ivory);
  border-bottom-color: var(--c-ivory);
}

/* 三栏原则卡 */
.page-about .principle-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .p-card {
  background: var(--bg);
  padding: 18px 18px 20px;
}

.page-about .p-label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .p-card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* 图片 */
.page-about .chapter-figure {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border: 1px solid var(--line);
  background: var(--c-ink-2);
  overflow: hidden;
}

.page-about .chapter-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* 四条业务线 */
.page-about .line-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .line-item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .line-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-gold);
}

.page-about .line-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .line-item .tag {
  justify-self: start;
}

/* 地图 */
.page-about .map-panel {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: clamp(12px, 2.5vw, 26px);
  background:
    linear-gradient(180deg, rgba(22, 38, 79, 0.9), rgba(11, 20, 48, 0.96));
  border: 1px solid var(--line);
}

.page-about .map-panel svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .map-links line {
  stroke: rgba(214, 161, 60, 0.22);
  stroke-width: 1;
}

.page-about .map-node circle {
  fill: var(--c-ink);
  stroke: var(--c-gold);
  stroke-width: 1.5;
  transition: fill 0.2s var(--ease), stroke 0.2s var(--ease);
}

.page-about .map-node text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  fill: var(--c-ivory);
}

.page-about .map-node .map-hint {
  font-size: 10px;
  fill: var(--c-turq-lit);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}

.page-about .map-node:hover circle,
.page-about .map-node:focus-visible circle {
  fill: var(--c-red);
  stroke: var(--c-gold-lit);
}

.page-about .map-node:hover .map-hint,
.page-about .map-node:focus-visible .map-hint {
  opacity: 1;
}

/* 地市清单 */
.page-about .city-list {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .city-row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .city-row dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .city-row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* 时间线 */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 24px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(var(--c-gold), rgba(214, 161, 60, 0.12));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--c-gold);
  background: var(--bg);
  transform: rotate(45deg);
}

.page-about .tl-year {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--c-gold);
}

.page-about .tl-item > p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 42em;
}

.page-about .tl-more {
  margin-top: 12px;
  border-left: 2px solid var(--c-turq);
  padding-left: 12px;
}

.page-about .tl-more summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--c-turq-lit);
  list-style: none;
}

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

.page-about .tl-more summary::before {
  content: "+ ";
  font-family: var(--font-mono);
}

.page-about .tl-more[open] summary::before {
  content: "− ";
}

.page-about .tl-more p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 40em;
}

/* 客户构成 */
.page-about .share-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .share-row {
  display: grid;
  gap: 7px;
}

.page-about .share-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: var(--c-ivory);
}

.page-about .share-head .mono {
  color: var(--c-gold);
  font-size: 13px;
}

.page-about .share-track {
  display: block;
  height: 6px;
  background: var(--line-soft);
}

.page-about .share-fill {
  display: block;
  height: 100%;
}

.page-about .share-fill--gold {
  background: var(--c-gold);
}

.page-about .share-fill--turq {
  background: var(--c-turq);
}

.page-about .share-fill--red {
  background: var(--c-red-lit);
}

.page-about .pledge-list {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3vw, 34px);
  background: var(--line-soft);
}

.page-about .pledge {
  background: var(--bg);
  padding: 18px 18px 20px;
  border-top: 2px solid var(--c-gold);
}

.page-about .pledge p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* 结尾行动区 */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  background:
    radial-gradient(100% 120% at 100% 0%, rgba(199, 53, 44, 0.2), transparent 58%),
    var(--c-ink-2);
  padding: clamp(36px, 6vw, 68px) 0;
}

.page-about .about-cta-inner {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-cta h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.25;
  color: var(--c-ivory);
}

.page-about .about-cta-text {
  margin: 14px 0 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

@media (min-width: 720px) {
  .page-about .principle-grid,
  .page-about .pledge-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .line-item {
    grid-template-columns: 48px minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 20px;
  }

  .page-about .line-item .tag {
    justify-self: end;
  }

  .page-about .city-row {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--topbar) + 28px);
    align-self: start;
  }

  .page-about .toc-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .toc-link {
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
    padding: 9px 0 9px 14px;
    white-space: normal;
  }

  .page-about .toc-link:hover,
  .page-about .toc-link:focus-visible {
    border-left-color: var(--c-gold);
    border-bottom-color: transparent;
  }

  .page-about .chapter {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 0 clamp(16px, 2vw, 28px);
    padding: clamp(44px, 6vw, 80px) 0;
  }

  .page-about .chapter-index {
    margin: 8px 0 0;
    padding-top: 6px;
    border-top: 1px solid var(--c-gold);
    align-self: start;
  }

  .page-about .chapter-cols {
    grid-template-columns: minmax(0, 1fr) var(--about-note-w);
    gap: clamp(24px, 3vw, 40px);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .cta-actions {
    justify-content: flex-end;
    max-width: 22em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .map-node circle,
  .page-about .map-node .map-hint,
  .page-about .toc-link {
    transition: none;
  }
}
<<<END>>>