.page-about {
  --ab-rail-w: 240px;
  --ab-gap: clamp(20px, 3vw, 44px);
  --ab-pad: clamp(28px, 4vw, 60px);
  background: var(--bc-cream);
  color: var(--bc-paper-ink);
}

/* ---------- 首屏品牌声明 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--bc-ink);
  color: var(--bc-cream);
  padding: clamp(20px, 3vw, 34px) 0 clamp(34px, 5vw, 64px);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    repeating-linear-gradient(180deg, rgba(79, 240, 208, 0.05) 0 1px, transparent 1px 5px),
    radial-gradient(120% 90% at 88% -20%, rgba(255, 106, 43, 0.24), transparent 62%),
    radial-gradient(90% 70% at 0% 0%, rgba(79, 240, 208, 0.14), transparent 58%);
}
.page-about .ab-crumbs {
  margin-bottom: clamp(22px, 3vw, 40px);
}
.page-about .ab-eyebrow {
  color: var(--bc-mint);
}
.page-about .ab-hero h1 {
  margin: 12px 0 0;
  font-family: var(--bc-font-display);
  font-weight: 800;
  font-size: clamp(32px, 5.6vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 16em;
}
.page-about .ab-hero-lead {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.8;
  color: rgba(243, 235, 221, 0.82);
}
.page-about .ab-hero-meta {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: clamp(18px, 2.5vw, 26px) 0 0;
  border-top: 1px solid rgba(243, 235, 221, 0.18);
  display: grid;
  gap: 18px;
}
.page-about .ab-hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.page-about .ab-meta-num {
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 700;
  color: var(--bc-mint);
  letter-spacing: 0.02em;
}
.page-about .ab-meta-label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(243, 235, 221, 0.7);
}
.page-about .ab-hero-figure {
  margin: clamp(26px, 4vw, 46px) 0 0;
}
.page-about .ab-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--bc-panel);
}

/* ---------- 双栏骨架 ---------- */
.page-about .ab-body {
  display: grid;
  gap: var(--ab-gap);
  padding-top: var(--ab-pad);
  padding-bottom: clamp(40px, 6vw, 84px);
}

/* ---------- 左侧刻度栏 ---------- */
.page-about .ab-rail {
  border-left: 2px solid var(--bc-orange);
  padding-left: 16px;
}
.page-about .ab-rail-title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #5c665f;
}
.page-about .ab-rail-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 14px;
}
.page-about .ab-rail-list a {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 5px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--bc-paper-ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--bc-ease), border-color 0.2s var(--bc-ease);
}
.page-about .ab-rail-list a .bc-mono {
  color: var(--bc-orange);
  font-size: 12px;
}
.page-about .ab-rail-list a:hover,
.page-about .ab-rail-list a:focus-visible {
  color: #0a1f1a;
  border-bottom-color: var(--bc-orange);
}
.page-about .ab-rail-years {
  margin-bottom: 22px;
}
.page-about .ab-year-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .ab-year-links a {
  display: inline-block;
  padding: 4px 9px;
  font-size: 12px;
  color: var(--bc-paper-ink);
  text-decoration: none;
  border: 1px solid var(--bc-line);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition: border-color 0.2s var(--bc-ease), color 0.2s var(--bc-ease), background-color 0.2s var(--bc-ease);
}
.page-about .ab-year-links a:hover,
.page-about .ab-year-links a:focus-visible {
  border-color: var(--bc-orange);
  color: #0a1f1a;
  background: rgba(255, 106, 43, 0.12);
}
.page-about .ab-rail-cta {
  display: inline-block;
  font-size: 14px;
}

/* ---------- 章节 ---------- */
.page-about .ab-main {
  min-width: 0;
}
.page-about .ab-chapter {
  padding: clamp(24px, 3.4vw, 40px) 0;
  border-top: 1px solid var(--bc-line);
  scroll-margin-top: 90px;
}
.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .ab-chapter-head {
  display: flex;
  gap: clamp(12px, 2vw, 22px);
  align-items: flex-start;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}
.page-about .ab-num {
  flex: none;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 0.95;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1.2px var(--bc-orange);
  letter-spacing: -0.04em;
}
.page-about .ab-chapter-titles {
  min-width: 0;
}
.page-about .ab-chapter-label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: #6b756e;
}
.page-about .ab-chapter h2 {
  margin: 0;
  font-family: var(--bc-font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.1vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.page-about .ab-text p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.82;
}
.page-about .ab-text p:last-child {
  margin-bottom: 0;
}

/* ---------- 三个业务方向 ---------- */
.page-about .ab-pillars {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-pillars li {
  background: #fbf5ea;
  border: 1px solid var(--bc-line);
  padding: 16px 18px;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}
.page-about .ab-pillar-key {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 7px;
  font-size: 11px;
  font-weight: 700;
  color: #0a1f1a;
  background: var(--bc-mint);
}
.page-about .ab-pillars h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
}
.page-about .ab-pillars p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #4a534d;
}

/* ---------- 数据条 ---------- */
.page-about .ab-stats {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 18px 0 0;
  border-top: 2px solid var(--bc-paper-ink);
  display: grid;
  gap: 16px;
}
.page-about .ab-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.page-about .ab-stat-num {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  color: var(--bc-orange);
  letter-spacing: -0.02em;
}
.page-about .ab-stat-label {
  font-size: 13px;
  color: #5c665f;
}

/* ---------- 图文分栏 ---------- */
.page-about .ab-split {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  align-items: start;
}
.page-about .ab-side-figure,
.page-about .ab-mid-figure {
  margin: 0;
}
.page-about .ab-side-figure img,
.page-about .ab-mid-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--bc-panel);
  border-bottom: 3px solid var(--bc-orange);
}
.page-about .ab-side-figure img {
  aspect-ratio: 3 / 2;
}
.page-about .ab-mid-figure {
  margin: clamp(18px, 3vw, 28px) 0;
}
.page-about .ab-mid-figure img {
  aspect-ratio: 4 / 3;
}

/* ---------- 手风琴 ---------- */
.page-about .ab-acc {
  margin-top: clamp(16px, 2.5vw, 24px);
  border-top: 1px solid var(--bc-line);
}
.page-about .ab-acc details {
  border-bottom: 1px solid var(--bc-line);
  padding: 12px 0;
}
.page-about .ab-acc summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  list-style: none;
  transition: color 0.2s var(--bc-ease);
}
.page-about .ab-acc summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-acc summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--bc-font-mono);
  color: var(--bc-orange);
  font-size: 18px;
  line-height: 1;
}
.page-about .ab-acc details[open] summary::after {
  content: "–";
}
.page-about .ab-acc summary:hover {
  color: #0a1f1a;
}
.page-about .ab-acc-idx {
  flex: none;
  min-width: 34px;
  font-size: 12px;
  color: #0a1f1a;
  background: var(--bc-line);
  padding: 2px 6px;
  text-align: center;
}
.page-about .ab-acc details[open] .ab-acc-idx {
  background: var(--bc-orange);
  color: #0a1f1a;
}
.page-about .ab-acc p {
  margin: 10px 0 0 44px;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.78;
  color: #4a534d;
}

/* ---------- 领取步骤 ---------- */
.page-about .ab-steps {
  list-style: none;
  counter-reset: step;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-steps li {
  position: relative;
  padding: 14px 16px 14px 58px;
  background: #fbf5ea;
  border-left: 3px solid var(--bc-orange);
  min-width: 0;
}
.page-about .ab-step-num {
  position: absolute;
  left: 16px;
  top: 15px;
  font-size: 15px;
  font-weight: 700;
  color: var(--bc-orange);
}
.page-about .ab-steps h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
}
.page-about .ab-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #4a534d;
}

/* ---------- 深绿引文块 ---------- */
.page-about .ab-quote {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--bc-ink);
  color: rgba(243, 235, 221, 0.85);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  background-image:
    repeating-linear-gradient(180deg, rgba(79, 240, 208, 0.05) 0 1px, transparent 1px 5px),
    radial-gradient(90% 120% at 100% 0%, rgba(79, 240, 208, 0.14), transparent 62%);
}
.page-about .ab-quote-title {
  margin: 0 0 10px;
  font-family: var(--bc-font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.35;
  color: var(--bc-cream);
}
.page-about .ab-quote p {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.8;
}
.page-about .ab-quote-link {
  display: inline-block;
  font-size: 14px;
  color: var(--bc-mint);
  text-decoration: none;
  border-bottom: 1px solid var(--bc-mint);
  padding-bottom: 2px;
  transition: color 0.2s var(--bc-ease), border-color 0.2s var(--bc-ease);
}
.page-about .ab-quote-link:hover,
.page-about .ab-quote-link:focus-visible {
  color: var(--bc-orange);
  border-bottom-color: var(--bc-orange);
}

/* ---------- 深色合作面板 ---------- */
.page-about .ab-slab {
  background: var(--bc-panel);
  color: rgba(243, 235, 221, 0.86);
  padding: clamp(24px, 3.5vw, 40px) clamp(18px, 3vw, 32px);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
  border-top: 0;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .ab-slab .ab-chapter-label {
  color: var(--bc-mint);
}
.page-about .ab-slab h2 {
  color: var(--bc-cream);
}
.page-about .ab-slab .ab-num {
  -webkit-text-stroke: 1.2px var(--bc-mint);
}
.page-about .ab-slab-lead {
  margin: 0 0 clamp(18px, 2.5vw, 26px);
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.82;
}
.page-about .ab-slab-stats {
  list-style: none;
  margin: 0 0 clamp(18px, 2.5vw, 24px);
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-slab-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 12px;
  border-left: 2px solid var(--bc-mint);
  font-size: 13px;
  color: rgba(243, 235, 221, 0.72);
}
.page-about .ab-slab-num {
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 700;
  color: var(--bc-orange);
  line-height: 1.1;
}
.page-about .ab-honors {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 26px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .ab-honor {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 12px 7px 8px;
  border: 1px solid rgba(79, 240, 208, 0.35);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  font-size: 13px;
  transition: border-color 0.22s var(--bc-ease), background-color 0.22s var(--bc-ease);
}
.page-about .ab-honor-year {
  padding: 2px 6px;
  font-size: 12px;
  font-weight: 700;
  color: #0a1f1a;
  background: var(--bc-yellow);
  transition: background-color 0.22s var(--bc-ease), color 0.22s var(--bc-ease);
}
.page-about .ab-honor-name {
  color: var(--bc-cream);
}
.page-about .ab-honor:hover,
.page-about .ab-honor:focus-within {
  border-color: var(--bc-orange);
  background: rgba(255, 106, 43, 0.1);
}
.page-about .ab-honor:hover .ab-honor-year,
.page-about .ab-honor:focus-within .ab-honor-year {
  background: var(--bc-orange);
  color: #0a1f1a;
}
.page-about .ab-slab-cta {
  font-size: 14px;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--bc-line);
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}
.page-about .ab-timeline li {
  position: relative;
  scroll-margin-top: 90px;
  min-width: 0;
}
.page-about .ab-timeline li::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--bc-orange);
  transform: rotate(45deg);
}
.page-about .ab-tl-year {
  margin: 0 0 4px;
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  color: var(--bc-orange);
  letter-spacing: 0.02em;
}
.page-about .ab-timeline h3 {
  margin: 0 0 5px;
  font-size: 17px;
  font-weight: 700;
}
.page-about .ab-timeline p:not(.ab-tl-year) {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: #4a534d;
}

/* ---------- 折线图 ---------- */
.page-about .ab-chart {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--bc-ink);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}
.page-about .ab-chart svg {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .ab-chart-grid line {
  stroke: rgba(138, 150, 144, 0.32);
  stroke-width: 1;
}
.page-about .ab-chart-line {
  fill: none;
  stroke: var(--bc-orange);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.page-about .ab-chart-dots circle {
  fill: var(--bc-mint);
  stroke: var(--bc-ink);
  stroke-width: 2;
}
.page-about .ab-chart-axis text {
  fill: var(--bc-gray);
  font-family: var(--bc-font-mono);
  font-size: 14px;
}
.page-about .ab-chart figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(243, 235, 221, 0.72);
}

/* ---------- 结尾指引 ---------- */
.page-about .ab-more {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.8;
}
.page-about .ab-more a {
  color: #0a1f1a;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--bc-orange);
  padding-bottom: 1px;
  transition: color 0.2s var(--bc-ease), border-color 0.2s var(--bc-ease);
}
.page-about .ab-more a:hover,
.page-about .ab-more a:focus-visible {
  color: var(--bc-orange);
  border-bottom-color: var(--bc-paper-ink);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .ab-hero-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-slab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
  .page-about .ab-side-figure {
    margin-top: 4px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-body {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .ab-rail {
    position: sticky;
    top: 96px;
  }
  .page-about .ab-rail-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
  .page-about .ab-chapter {
    padding: clamp(30px, 3.6vw, 46px) 0;
  }
  .page-about .ab-chapter:first-child {
    padding-top: 0;
  }
  .page-about .ab-acc p {
    margin-left: 0;
    padding-left: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail-list a,
  .page-about .ab-year-links a,
  .page-about .ab-quote-link,
  .page-about .ab-more a,
  .page-about .ab-honor,
  .page-about .ab-honor-year,
  .page-about .ab-acc summary {
    transition: none;
  }
}
<<<END>>>