.page-about {
  --ab-line: rgba(154, 167, 189, .18);
  --ab-line-hot: rgba(52, 231, 228, .42);
  --ab-panel: rgba(27, 37, 64, .55);
  position: relative;
  isolation: isolate;
  color: var(--ice);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(154, 167, 189, .06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(154, 167, 189, .06) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 130% 58% at 50% 0%, #000 12%, transparent 74%);
  mask-image: radial-gradient(ellipse 130% 58% at 50% 0%, #000 12%, transparent 74%);
}

@media (min-width: 900px) {
  .page-about::before {
    background-size: 72px 72px;
  }
}

/* ---------- 首屏 ---------- */
.ab-hero {
  padding-top: clamp(24px, 4vw, 44px);
}

.ab-hero .crumbs {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.ab-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.ab-hero-copy {
  min-width: 0;
}

.ab-title {
  margin: 10px 0 0;
  letter-spacing: .02em;
  background: linear-gradient(102deg, var(--ice) 12%, var(--cyan) 58%, var(--violet) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.ab-lede {
  margin-top: 20px;
  max-width: 60ch;
  color: rgba(244, 247, 251, .78);
}

.ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.ab-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--ab-line);
  list-style: none;
}

.ab-hero-facts > div {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 88px;
}

.ab-hero-facts dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--fog);
}

.ab-hero-facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--gold);
  letter-spacing: .02em;
}

.ab-hero-visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(52, 231, 228, .16), rgba(10, 13, 20, .6) 48%, rgba(139, 92, 246, .26));
  box-shadow: var(--shadow-1);
}

.ab-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  opacity: .92;
}

.ab-hero-visual figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 18px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(244, 247, 251, .82);
  background: linear-gradient(to top, rgba(10, 13, 20, .92), rgba(10, 13, 20, 0));
}

@media (min-width: 900px) {
  .ab-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 52px;
    align-items: center;
  }
}

/* ---------- 主体：索引轨道 + 内容 ---------- */
.ab-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(44px, 6vw, 72px);
}

.ab-rail {
  border-top: 1px solid var(--ab-line);
  padding-top: 14px;
  min-width: 0;
}

.ab-rail-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--fog);
}

.ab-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.ab-rail-link {
  display: inline-block;
  padding: 3px 0;
  font-size: 13.5px;
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.ab-rail-link:hover,
.ab-rail-link:focus-visible {
  color: var(--cyan);
  border-color: var(--ab-line-hot);
}

.ab-rail-link.is-current {
  color: var(--gold);
  border-color: rgba(242, 193, 78, .55);
}

.ab-content {
  min-width: 0;
}

@media (min-width: 1024px) {
  .ab-body {
    grid-template-columns: 178px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .ab-rail {
    position: sticky;
    top: 96px;
  }

  .ab-rail-list {
    flex-direction: column;
    gap: 2px;
  }

  .ab-rail-link {
    display: block;
    padding: 7px 0 7px 12px;
    border-bottom: 0;
    border-left: 1px solid var(--ab-line);
    font-size: 13px;
  }

  .ab-rail-link.is-current {
    border-left-color: var(--gold);
    background: linear-gradient(90deg, rgba(242, 193, 78, .12), transparent 78%);
  }
}

/* ---------- 章节通用 ---------- */
.ab-sec {
  padding-top: clamp(44px, 6vw, 72px);
  scroll-margin-top: 96px;
}

.ab-sec:first-child {
  padding-top: 0;
}

.ab-sec-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-top: 16px;
  margin-bottom: 22px;
  border-top: 1px solid var(--ab-line);
}

.ab-sec-no {
  flex: none;
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.ab-sec-head .h2 {
  margin: 0;
  letter-spacing: .01em;
}

.ab-sec-body p,
.ab-sec > p {
  max-width: 68ch;
  color: rgba(244, 247, 251, .8);
}

.ab-sec-body p + p {
  margin-top: 16px;
}

.ab-sub-title {
  margin: 34px 0 14px;
  font-size: 16px;
  letter-spacing: .06em;
  color: var(--fog);
}

/* 要点列表 */
.ab-points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.ab-points li {
  background: rgba(17, 26, 43, .82);
  padding: 18px 18px 18px 20px;
  border-left: 2px solid transparent;
  transition: background .28s var(--ease), border-color .28s var(--ease);
}

.ab-points li:hover {
  background: rgba(27, 37, 64, .92);
  border-left-color: var(--cyan);
}

.ab-points strong {
  display: block;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ice);
  margin-bottom: 6px;
  letter-spacing: .02em;
}

.ab-points span {
  display: block;
  font-size: 14px;
  line-height: 1.72;
  color: var(--fog);
}

@media (min-width: 760px) {
  .ab-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 时间轴 ---------- */
.ab-figure {
  margin: 26px 0 34px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(140deg, rgba(139, 92, 246, .18), rgba(10, 13, 20, .7) 60%);
}

.ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .88;
}

.ab-figure figcaption {
  padding: 12px 16px;
  font-size: 12.5px;
  color: var(--fog);
  border-top: 1px solid var(--ab-line);
}

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

.ab-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--violet) 62%, rgba(154, 167, 189, .1));
}

.ab-node {
  position: relative;
  padding: 0 0 30px 36px;
}

.ab-node:last-child {
  padding-bottom: 0;
}

.ab-node-dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--obsidian);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(52, 231, 228, .1);
  transition: box-shadow .3s var(--ease), border-color .3s var(--ease);
}

.ab-node:hover .ab-node-dot,
.ab-node:focus-within .ab-node-dot {
  border-color: var(--gold);
  box-shadow: 0 0 0 6px rgba(242, 193, 78, .16);
}

.ab-ver {
  margin: 0 0 4px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--gold);
}

.ab-node-title {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--ice);
}

.ab-node-text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--fog);
}

.ab-node.is-current .ab-node-title {
  color: var(--cyan);
}

@media (min-width: 900px) {
  .ab-node {
    padding-left: 44px;
    padding-bottom: 34px;
  }

  .ab-node-dot {
    left: 3px;
    top: 10px;
  }
}

/* ---------- 分类标签网格 ---------- */
.ab-tag-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.ab-tag {
  background: rgba(17, 26, 43, .92);
  padding: 20px 18px;
  transition: background .28s var(--ease), box-shadow .28s var(--ease);
}

.ab-tag:hover {
  background: rgba(27, 37, 64, .96);
  box-shadow: inset 0 0 0 1px var(--ab-line-hot);
}

.ab-tag-no {
  display: block;
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--violet);
  margin-bottom: 10px;
}

.ab-tag h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ice);
}

.ab-tag p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--fog);
}

@media (min-width: 640px) {
  .ab-tag-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .ab-tag-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 数据条 ---------- */
.ab-stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.ab-stat-cell {
  background: linear-gradient(155deg, rgba(15, 59, 58, .78), rgba(10, 13, 20, .78));
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ab-stat-cell .n {
  font-size: clamp(28px, 4.6vw, 40px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: -.01em;
}

.ab-stat-cell .l {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--fog);
}

@media (min-width: 640px) {
  .ab-stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 胶片带（本站共享组件的页面微调） ---------- */
.page-about .filmstrip {
  scrollbar-width: thin;
}

.page-about .filmstripItem {
  min-width: 168px;
  padding: 16px 15px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-sm);
  background: linear-gradient(158deg, rgba(139, 92, 246, .18), rgba(10, 13, 20, .6));
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .filmstripItem:hover {
  border-color: rgba(139, 92, 246, .6);
  transform: translateY(-2px);
}

.ab-fs-no {
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.ab-fs-name {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: .03em;
}

/* ---------- 团队 ---------- */
.ab-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 24px;
}

.ab-team-copy p {
  max-width: 64ch;
  color: rgba(244, 247, 251, .8);
}

.ab-team-copy p + p {
  margin-top: 16px;
}

.ab-team-visual {
  margin: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(52, 231, 228, .14), rgba(10, 13, 20, .72) 55%, rgba(255, 93, 162, .16));
}

.ab-team-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  opacity: .9;
}

.ab-team-visual figcaption {
  padding: 12px 16px;
  font-size: 12.5px;
  color: var(--fog);
  border-top: 1px solid var(--ab-line);
}

@media (min-width: 960px) {
  .ab-team-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 40px;
    align-items: start;
  }
}

.ab-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 30px;
}

.ab-team-card {
  position: relative;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  padding: 18px 18px 18px 20px;
  background: linear-gradient(150deg, rgba(27, 37, 64, .92), rgba(10, 13, 20, .68));
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.ab-team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--violet));
  opacity: .8;
}

.ab-team-card:hover {
  border-color: var(--ab-line-hot);
  box-shadow: var(--shadow-2);
}

.ab-team-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: .03em;
}

.ab-team-card p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.74;
  color: var(--fog);
}

@media (min-width: 700px) {
  .ab-teams {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .ab-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 协作生态 */
.ab-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 30px;
  padding: 24px 20px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background:
    radial-gradient(circle at 88% 8%, rgba(139, 92, 246, .22), transparent 58%),
    linear-gradient(150deg, rgba(17, 26, 43, .94), rgba(10, 13, 20, .78));
}

.ab-eco-lead {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ab-eco-lead .n {
  font-size: clamp(34px, 5.4vw, 50px);
  line-height: 1;
  color: var(--cyan);
}

.ab-eco-lead .l {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--fog);
}

.ab-eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ab-eco-list li {
  font-size: 13px;
  letter-spacing: .03em;
  color: rgba(244, 247, 251, .86);
  padding: 6px 13px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-pill);
  background: rgba(10, 13, 20, .5);
}

.ab-eco-note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--fog);
  max-width: 68ch;
}

@media (min-width: 900px) {
  .ab-eco {
    grid-template-columns: 160px minmax(0, 1fr);
    align-items: start;
    gap: 24px 32px;
    padding: 28px 26px;
  }

  .ab-eco-lead {
    grid-row: span 2;
  }
}

/* ---------- 服务覆盖 ---------- */
.ab-coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 22px;
}

.ab-coverage-main p {
  max-width: 66ch;
  color: rgba(244, 247, 251, .8);
}

.ab-coverage-main p + p {
  margin-top: 16px;
}

.ab-coverage-panel {
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  padding: 20px 18px;
  background: linear-gradient(160deg, rgba(15, 59, 58, .62), rgba(10, 13, 20, .82));
}

.ab-panel-label {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--fog);
}

.ab-coverage-stats {
  margin: 0;
  display: grid;
  gap: 14px;
}

.ab-coverage-stats > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ab-line);
}

.ab-coverage-stats > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.ab-coverage-stats dt {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--fog);
}

.ab-coverage-stats dd {
  margin: 0;
  font-size: 16px;
  color: var(--gold);
  letter-spacing: .02em;
}

@media (min-width: 960px) {
  .ab-coverage {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    gap: 40px;
    align-items: start;
  }
}

/* ---------- 年度索引与荣誉 ---------- */
.ab-honor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.ab-honor-card {
  position: relative;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  padding: 24px 20px;
  overflow: hidden;
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.ab-honor-card:hover {
  transform: translateY(-3px);
}

.ab-honor-card--gold {
  background: linear-gradient(155deg, rgba(242, 193, 78, .18), rgba(10, 13, 20, .84) 66%);
}

.ab-honor-card--gold:hover {
  border-color: rgba(242, 193, 78, .48);
}

.ab-honor-card--violet {
  background: linear-gradient(155deg, rgba(139, 92, 246, .22), rgba(10, 13, 20, .84) 66%);
}

.ab-honor-card--violet:hover {
  border-color: rgba(139, 92, 246, .55);
}

.ab-honor-card--teal {
  background: linear-gradient(155deg, rgba(15, 59, 58, .82), rgba(10, 13, 20, .84) 66%);
}

.ab-honor-card--teal:hover {
  border-color: var(--ab-line-hot);
}

.ab-honor-tag {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--fog);
}

.ab-honor-card h3 {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
  letter-spacing: .02em;
  color: var(--ice);
}

.ab-honor-card p:not(.ab-honor-tag) {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--fog);
}

@media (min-width: 760px) {
  .ab-honor-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .ab-honor-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 结尾入口 ---------- */
.ab-cta {
  margin-top: clamp(48px, 6vw, 76px);
  padding: 28px 22px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(circle at 8% 92%, rgba(52, 231, 228, .18), transparent 55%),
    radial-gradient(circle at 94% 6%, rgba(242, 193, 78, .16), transparent 52%),
    linear-gradient(160deg, rgba(27, 37, 64, .94), rgba(10, 13, 20, .86));
}

.ab-cta-title {
  margin: 0 0 10px;
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
  letter-spacing: .02em;
  color: var(--ice);
}

.ab-cta-text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--fog);
}

.ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

@media (min-width: 900px) {
  .ab-cta {
    padding: 36px 34px;
  }
}
</main>