.page-about {
  --about-card: rgba(20, 28, 66, .62);
  --about-card-soft: rgba(20, 28, 66, .45);
  --about-pulse-glow: rgba(34, 211, 197, .16);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--dim);
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--mist);
  border-bottom-color: var(--mist);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--pulse);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 30px;
  padding: 22px 0 4px;
}
.page-about .about-hero__copy { min-width: 0; }
.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(27px, 4.6vw, 42px);
  line-height: 1.24;
  letter-spacing: .05em;
  font-weight: 700;
  color: var(--ink);
  max-width: 20ch;
}
.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-hero__fig {
  position: relative;
  margin: 0;
  min-width: 0;
}
.page-about .about-hero__fig::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 92px;
  height: 3px;
  background: var(--gold);
  opacity: .78;
  z-index: 2;
}
.page-about .about-hero__fig::after {
  content: "";
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 3px;
  height: 64px;
  background: var(--nebula);
  opacity: .8;
  z-index: 2;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .hero-stat {
  border-top: 2px solid var(--line);
  padding-top: 10px;
  min-width: 0;
}
.page-about .hero-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: .04em;
  font-weight: 600;
  color: var(--pulse);
}
.page-about .hero-stat span {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--dim);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  margin-top: 46px;
}
.page-about .about-body > * { min-width: 0; }
.page-about .about-main { min-width: 0; }

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: 30px 0 8px;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--rail-h) + var(--nav-h) + 16px);
}
.page-about .about-sec:first-child { border-top: 0; padding-top: 4px; }
.page-about .about-sec .section-head { margin-bottom: 4px; }
.page-about .about-sec p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 62ch;
}
.page-about .about-sec .section-title {
  margin: 6px 0 0;
  font-size: clamp(21px, 2.7vw, 29px);
  line-height: 1.32;
  letter-spacing: .05em;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 12 类品类 ---------- */
.page-about .cat-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .cat-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 2px solid var(--line);
  background: var(--about-card-soft);
  font-size: 13.5px;
  color: var(--ink);
  min-width: 0;
}
.page-about .cat-list .mono {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--violet);
  flex: none;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--pulse), var(--nebula) 62%, rgba(34, 211, 197, 0));
}
.page-about .tl-node {
  position: relative;
  margin: 0 0 20px;
}
.page-about .tl-node:last-child { margin-bottom: 0; }
.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 14px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: 0 0 0 4px var(--about-pulse-glow);
}
.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: -19px;
  top: 19px;
  width: 9px;
  height: 1px;
  background: var(--line);
}
.page-about .tl-card {
  border: 2px solid var(--line);
  border-left: 3px solid var(--nebula);
  background: var(--about-card);
  padding: 14px 16px;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-left-color .28s var(--ease);
}
.page-about .tl-card:hover {
  transform: translateY(-2px);
  border-left-color: var(--pulse);
  box-shadow: 0 10px 26px rgba(4, 8, 24, .55);
}
.page-about .tl-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--violet);
}
.page-about .tl-card h3 {
  margin: 7px 0 0;
  font-size: 16px;
  letter-spacing: .05em;
  font-weight: 600;
  color: var(--ink);
}
.page-about .tl-card p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team__fig {
  margin: 22px 0 0;
}
.page-about .bars {
  display: grid;
  gap: 20px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .bar-row { display: grid; gap: 9px; min-width: 0; }
.page-about .bar-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px 14px;
  font-size: 13.5px;
  color: var(--ink);
}
.page-about .bar-meta .mono {
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--pulse);
  flex: none;
}
.page-about .bar-track {
  height: 16px;
  border: 2px solid var(--line);
  background: rgba(10, 18, 48, .72);
}
.page-about .bar-fill {
  height: 100%;
  width: var(--w, 0%);
  background: var(--pulse);
}
.page-about .bar-fill--a { --w: 20%; background: var(--pulse); }
.page-about .bar-fill--b { --w: 38.3%; background: var(--nebula); }
.page-about .bar-fill--c { --w: 15%; background: var(--violet); }
.page-about .bar-fill--d { --w: 26.7%; background: var(--mist); }
.page-about .bar-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 服务点 ---------- */
.page-about .nodes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .node {
  border: 2px solid var(--line);
  background: var(--about-card-soft);
  padding: 12px 13px 13px;
  min-width: 0;
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}
.page-about .node:hover {
  border-color: var(--violet);
  transform: translateY(-2px);
}
.page-about .node__idx {
  display: block;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--dim);
}
.page-about .node__name {
  display: block;
  margin-top: 6px;
  font-size: 15.5px;
  letter-spacing: .05em;
  font-weight: 600;
  color: var(--ink);
}
.page-about .node .status {
  margin-top: 9px;
  font-size: 12px;
}

/* ---------- 问答折叠 ---------- */
.page-about .qa {
  margin-top: 22px;
  border: 2px solid var(--line);
  background: var(--about-card-soft);
}
.page-about .qa summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  font-size: 14.5px;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}
.page-about .qa summary::-webkit-details-marker { display: none; }
.page-about .qa summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--pulse);
  flex: none;
}
.page-about .qa[open] summary::after { content: "–"; }
.page-about .qa__body {
  border-top: 1px solid var(--line-soft);
  padding: 0 16px 16px;
}
.page-about .qa__body p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 资质 ---------- */
.page-about .about-creds__fig {
  margin: 22px 0 0;
}
.page-about .creds__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .cred {
  position: relative;
  border: 2px solid var(--line);
  background: var(--about-card);
  padding: 20px 16px 16px;
  min-width: 0;
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}
.page-about .cred::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  width: 32px;
  height: 32px;
  border-top: 3px solid var(--gold);
  border-left: 3px solid var(--gold);
}
.page-about .cred:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(4, 8, 24, .55);
}
.page-about .cred b {
  display: block;
  font-size: 15px;
  letter-spacing: .04em;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}
.page-about .cred p {
  margin: 9px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin: 48px 0 34px;
  border: 2px solid var(--line);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(108, 75, 216, .32), rgba(108, 75, 216, 0) 58%),
    var(--about-card);
  padding: 26px 20px 24px;
}
.page-about .about-cta .section-title {
  margin: 0;
  font-size: clamp(21px, 2.6vw, 28px);
  letter-spacing: .05em;
  color: var(--ink);
}
.page-about .about-cta p {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

/* ---------- 侧栏索引 ---------- */
.page-about .about-index {
  margin-top: 42px;
  min-width: 0;
}
.page-about .idx-list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-about .idx-list li {
  border-bottom: 1px solid var(--line-soft);
}
.page-about .idx-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 4px;
  font-size: 13.5px;
  color: var(--muted);
  text-decoration: none;
  transition: color .24s var(--ease), padding-left .24s var(--ease);
}
.page-about .idx-list a:hover,
.page-about .idx-list a:focus-visible {
  color: var(--mist);
  padding-left: 9px;
}
.page-about .idx-list .mono {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--violet);
  flex: none;
}
.page-about .about-index__panel {
  margin-top: 24px;
}
.page-about .idx-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

/* ---------- 图片基础 ---------- */
.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .cat-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .nodes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .creds__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    align-items: start;
    gap: 46px;
    padding: 40px 0 10px;
  }
  .page-about .about-hero__fig { margin-top: 34px; }
  .page-about .hero-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .page-about .about-body { margin-top: 54px; }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--rail-h) + var(--nav-h) + 18px);
    align-self: start;
    margin-top: 30px;
  }
  .page-about .about-index__panel { margin-top: 28px; }
}

@media (max-width: 560px) {
  .page-about .about-hero h1 { letter-spacing: .03em; }
  .page-about .about-cta__actions .btn { width: 100%; text-align: center; }
  .page-about .tl-card { padding: 12px 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .node,
  .page-about .cred,
  .page-about .idx-list a {
    transition: none;
  }
  .page-about .tl-card:hover,
  .page-about .node:hover,
  .page-about .cred:hover {
    transform: none;
  }
}