.page-about {
  --ab-rail: 148px;
  --ab-node-gap: 22px;
  background: var(--night-900);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 40px) 0 60px;
  background:
    radial-gradient(880px 520px at 86% -10%, rgba(159, 18, 57, 0.36), transparent 62%),
    radial-gradient(760px 460px at 4% 2%, rgba(245, 158, 11, 0.15), transparent 66%),
    linear-gradient(168deg, var(--night) 0%, var(--night-900) 58%, var(--deep) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -210px;
  right: -170px;
  width: 540px;
  height: 540px;
  border-radius: 50%;
  border: 1px dashed rgba(245, 158, 11, 0.22);
  box-shadow: 0 0 0 76px rgba(34, 211, 238, 0.035);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  margin-bottom: 30px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb-link {
  color: var(--ink-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .hero-split {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .hero-visual {
  display: grid;
  gap: 12px;
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  border: 1px solid var(--line);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .hero-caption {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
}

.page-about .hero-copy {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .section-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(34px, 7vw, 62px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--gold);
}

.page-about .about-hero .section-lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 300;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .fact {
  padding: 14px 16px;
  background: rgba(15, 23, 42, 0.62);
}

.page-about .fact-name {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
}

.page-about .fact-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-about .fact-unit {
  margin-left: 4px;
  font-size: 14px;
  color: var(--ink-dim);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: 68px 0;
}

.page-about .section-head {
  display: grid;
  gap: 14px;
  max-width: 62ch;
  margin-bottom: 40px;
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .section-note {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .inline-link {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(251, 191, 36, 0.42);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  background: var(--night);
}

.page-about .timeline-grid {
  display: grid;
  gap: 26px;
}

.page-about .year-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-link {
  display: inline-block;
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  white-space: nowrap;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .year-link:hover,
.page-about .year-link:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .timeline-body {
  display: grid;
  gap: var(--ab-node-gap);
  min-width: 0;
}

.page-about .tl-node {
  position: relative;
  padding: 22px 20px 22px 24px;
  background: rgba(248, 250, 252, 0.028);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--line-strong);
  transition: border-color 0.4s var(--ease), background-color 0.4s var(--ease), transform 0.4s var(--ease);
}

.page-about .tl-node[data-active="true"] {
  border-left-color: var(--amber);
  background: rgba(245, 158, 11, 0.06);
}

.page-about .tl-year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .tl-node p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .tl-node p + p {
  margin-top: 10px;
}

.page-about .tl-figure {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .tl-figure figcaption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--ink-dim);
}

/* 滚动高亮：左侧年份跟随右侧节点点亮 */
.page-about .timeline-grid:has(#tl-2019[data-active="true"]) .year-item[data-year="2019"] .year-link,
.page-about .timeline-grid:has(#tl-2021[data-active="true"]) .year-item[data-year="2021"] .year-link,
.page-about .timeline-grid:has(#tl-2022[data-active="true"]) .year-item[data-year="2022"] .year-link,
.page-about .timeline-grid:has(#tl-2023[data-active="true"]) .year-item[data-year="2023"] .year-link,
.page-about .timeline-grid:has(#tl-2024[data-active="true"]) .year-item[data-year="2024"] .year-link {
  color: var(--deep);
  background: var(--amber);
  border-color: var(--amber);
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team {
  background:
    linear-gradient(180deg, var(--deep) 0%, var(--night-900) 100%);
}

.page-about .team-split {
  display: grid;
  gap: 34px;
  margin-bottom: 42px;
}

.page-about .team-intro {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .team-intro .section-title {
  margin: 0;
}

.page-about .team-intro p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .team-contact {
  padding-left: 14px;
  border-left: 2px solid var(--velvet);
}

.page-about .team-console {
  border: 1px solid var(--line);
  background: rgba(30, 27, 75, 0.48);
  padding: 16px;
  min-width: 0;
}

.page-about .console-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
}

.page-about .console-total {
  margin-left: auto;
  color: var(--cyan);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .status-dot,
.page-about .panel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: 0 0 auto;
  display: inline-block;
}

.page-about .status-dot {
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.16);
  animation: ab-breathe 3.4s var(--ease) infinite;
}

@keyframes ab-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.42; }
}

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

.page-about .team-panel {
  padding: 15px 16px;
  background: rgba(15, 23, 42, 0.62);
  border: 1px solid var(--line-soft);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-about .team-panel:hover,
.page-about .team-panel:focus-within {
  transform: translateY(-3px);
  border-color: rgba(245, 158, 11, 0.5);
}

.page-about .panel-head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 9px;
}

.page-about .panel-dot--amber { background: var(--amber); }
.page-about .panel-dot--cyan { background: var(--cyan); }
.page-about .panel-dot--velvet { background: var(--velvet-soft); }
.page-about .panel-dot--green { background: var(--green); }

.page-about .panel-name {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .panel-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .panel-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-dim);
}

.page-about .team-figure {
  display: grid;
}

/* ---------- 服务范围与内容体系 ---------- */
.page-about .about-system {
  background: var(--warm);
  color: var(--coal);
}

.page-about .about-system .section-title {
  color: var(--coal);
}

.page-about .about-system .section-note {
  color: var(--stone);
}

.page-about .about-system .section-index {
  color: var(--velvet);
}

.page-about .system-grid {
  display: grid;
  gap: 20px;
}

.page-about .system-block {
  padding: 22px 20px;
  background: #ffffff;
  border: 1px solid rgba(28, 25, 23, 0.1);
  border-top: 3px solid var(--amber);
}

.page-about .system-title {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 800;
  color: var(--coal);
}

.page-about .system-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .system-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 13px;
  border-bottom: 1px dashed rgba(28, 25, 23, 0.12);
}

.page-about .system-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .sys-num {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--velvet);
  white-space: nowrap;
}

.page-about .sys-txt {
  font-size: 15px;
  line-height: 1.7;
  color: var(--coal);
}

.page-about .system-tail {
  margin: 26px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-system .inline-link {
  color: var(--velvet);
  border-bottom-color: rgba(159, 18, 57, 0.34);
}

.page-about .about-system .inline-link:hover,
.page-about .about-system .inline-link:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 行业评价与收尾 ---------- */
.page-about .about-recognition {
  background:
    radial-gradient(720px 420px at 88% 6%, rgba(159, 18, 57, 0.28), transparent 64%),
    linear-gradient(180deg, var(--night-900) 0%, var(--night) 100%);
}

.page-about .recog-split {
  display: grid;
  gap: 32px;
  margin-bottom: 46px;
}

.page-about .recog-copy {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .recog-copy .section-title {
  margin: 0;
}

.page-about .recog-copy p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .recog-badges {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .recog-badge {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(248, 250, 252, 0.04);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--gold);
}

.page-about .badge-year {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .badge-text {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  padding-top: 32px;
  border-top: 1px solid var(--line-soft);
}

.page-about .cta-lead {
  margin: 0;
  font-size: 18px;
  font-weight: 300;
  color: var(--ink);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 64px) 0 88px;
  }

  .page-about .hero-split {
    grid-template-columns: 5fr 7fr;
    gap: 58px;
    align-items: center;
  }

  .page-about .section {
    padding: 92px 0;
  }

  .page-about .timeline-grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .timeline-rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }

  .page-about .year-list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .year-link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 0 8px 16px;
    font-size: 20px;
    letter-spacing: 0.04em;
  }

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

  .page-about .timeline-grid:has(#tl-2019[data-active="true"]) .year-item[data-year="2019"] .year-link,
  .page-about .timeline-grid:has(#tl-2021[data-active="true"]) .year-item[data-year="2021"] .year-link,
  .page-about .timeline-grid:has(#tl-2022[data-active="true"]) .year-item[data-year="2022"] .year-link,
  .page-about .timeline-grid:has(#tl-2023[data-active="true"]) .year-item[data-year="2023"] .year-link,
  .page-about .timeline-grid:has(#tl-2024[data-active="true"]) .year-item[data-year="2024"] .year-link {
    color: var(--amber);
    background: transparent;
    border-left-color: var(--amber);
  }

  .page-about .team-split {
    grid-template-columns: 4fr 8fr;
    gap: 56px;
    align-items: start;
  }

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

  .page-about .recog-split {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 28px;
  }

  .page-about .cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .hero-split {
    grid-template-columns: 4fr 8fr;
    gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .status-dot {
    animation: none;
  }

  .page-about .team-panel,
  .page-about .tl-node,
  .page-about .year-link {
    transition: none;
  }
}
</final>