/* =============================================
   page-about — 品牌故事 / 地图图例视觉隐喻
   ============================================= */
.page-about {
  --ab-grid-line: rgba(35, 42, 58, 0.46);
  --ab-bg-card: var(--color-midnight);
  --ab-border: var(--color-steel);
  background:
    linear-gradient(var(--ab-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--ab-grid-line) 1px, transparent 1px),
    var(--color-ink);
  background-size: 64px 64px;
  color: var(--color-body);
  font-family: var(--font-body);
  line-height: 1.7;
  padding-bottom: 96px;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 28px var(--gutter) 0;
}

.page-about .breadcrumb__list {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  font-family: var(--font-mono);
}

.page-about .breadcrumb__link {
  color: var(--color-silver);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--color-gold);
}

.page-about .breadcrumb__sep {
  color: var(--color-steel);
}

.page-about .breadcrumb__current {
  color: var(--color-gold);
}

/* ---------- 01 品牌坐标 ---------- */
.page-about .about-hero {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 56px var(--gutter) 0;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--color-orange);
  margin: 0 0 16px;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-paper);
  font-size: clamp(34px, 7vw, 64px);
  margin: 0 0 24px;
}

.page-about .about-hero__copy h1 span {
  display: block;
  color: var(--color-gold);
  font-size: 0.52em;
  line-height: 1.25;
  letter-spacing: 0.02em;
  margin-top: 12px;
}

.page-about .about-hero__lead {
  font-size: 16px;
  font-weight: 300;
  line-height: 1.85;
  color: var(--color-body);
  margin: 0 0 32px;
  max-width: 54ch;
}

.page-about .about-hero__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding: 18px 0 0;
  border-top: 1px solid var(--ab-border);
}

.page-about .about-hero__legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-silver);
}

.page-about .about-hero__legend-sq {
  width: 10px;
  height: 10px;
  display: inline-block;
  border-radius: 0;
}

.page-about .about-hero__legend-sq--gold {
  background: var(--color-gold);
}

.page-about .about-hero__legend-sq--green {
  background: var(--color-green);
}

.page-about .about-hero__legend-sq--orange {
  background: var(--color-orange);
}

.page-about .about-hero__map {
  background: var(--ab-bg-card);
  border: 1px solid var(--ab-border);
  padding: 16px;
  margin: 0;
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-hero__svg text {
  font-family: var(--font-display);
}

.page-about .about-hero__map-link {
  cursor: pointer;
}

.page-about .about-hero__map figcaption {
  margin-top: 20px;
  padding-top: 12px;
  border-top: 1px solid var(--ab-border);
  font-size: 12px;
  color: var(--color-silver);
}

.page-about .about-hero__media {
  margin-top: 48px;
  max-width: 800px;
  border: 1px solid var(--ab-border);
  background: var(--ab-bg-card);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-hero__media .caption {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--ab-border);
  font-size: 12px;
  color: var(--color-silver);
}

/* ---------- 02 关键节点 ---------- */
.page-about .about-timeline {
  margin-top: 104px;
}

.page-about .section-head {
  margin-bottom: 40px;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--color-orange);
  margin: 0 0 10px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--color-paper);
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.page-about .section-sub {
  font-size: 15px;
  color: var(--color-silver);
  margin: 0;
  max-width: 46ch;
}

.page-about .about-timeline__band {
  margin-top: 40px;
  padding: 48px 0;
  background: linear-gradient(180deg, #101A30, var(--color-midnight));
  border-block: 1px solid var(--ab-border);
}

.page-about .about-timeline__track {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding-bottom: 8px;
}

.page-about .about-timeline__svg {
  min-width: 1200px;
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-timeline__node-link {
  cursor: pointer;
}

.page-about .about-timeline__hint {
  margin-top: 16px;
  font-size: 12px;
  color: var(--color-silver);
}

/* ---------- 03 技术分水岭 ---------- */
.page-about .about-tech {
  margin-top: 104px;
}

.page-about .about-tech__columns {
  display: grid;
  gap: 24px;
  margin-top: 40px;
}

.page-about .about-tech__item {
  position: relative;
  border: 1px solid var(--ab-border);
  background: var(--ab-bg-card);
  padding: 28px;
}

.page-about .about-tech__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 48px;
  height: 4px;
}

.page-about .about-tech__item--left::before {
  background: var(--color-gold);
}

.page-about .about-tech__item--right::before {
  background: var(--color-orange);
}

.page-about .about-tech__item h3 {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-paper);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.page-about .about-tech__item p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-body);
  margin: 0;
}

.page-about .about-tech__media {
  margin-top: 48px;
  max-width: 640px;
  border: 1px solid var(--ab-border);
  background: var(--ab-bg-card);
}

.page-about .about-tech__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-tech__media .caption {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--ab-border);
  font-size: 12px;
  color: var(--color-silver);
}

/* ---------- 04 用户认可 ---------- */
.page-about .about-trust {
  margin-top: 104px;
  padding: 56px 0 64px;
  background: var(--color-midnight);
  border-block: 1px solid var(--ab-border);
}

.page-about .about-trust__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.page-about .about-trust__stat {
  background: var(--color-ink);
  border: 1px solid var(--ab-border);
  padding: 22px 18px;
}

.page-about .about-trust__num {
  display: block;
  font-size: clamp(24px, 5vw, 40px);
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.page-about .about-trust__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-silver);
}

.page-about .about-trust__media {
  margin-top: 40px;
  border: 1px solid var(--ab-border);
  background: var(--color-ink);
}

.page-about .about-trust__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  opacity: 0.88;
}

.page-about .about-trust__media .caption {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--ab-border);
  font-size: 12px;
  color: var(--color-silver);
}

.page-about .about-trust__partners {
  margin-top: 40px;
  display: grid;
  gap: 16px;
}

.page-about .about-trust__partner {
  background: var(--color-steel);
  padding: 20px 24px;
  border-left: 4px solid var(--color-green);
  margin: 0;
}

.page-about .about-trust__partner h4 {
  font-size: 16px;
  font-weight: 800;
  color: var(--color-paper);
  margin: 0 0 8px;
}

.page-about .about-trust__partner p {
  font-size: 14px;
  color: var(--color-body);
  margin: 0;
}

/* ---------- 05 团队组织 ---------- */
.page-about .about-team {
  margin-top: 104px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-team__unit {
  border: 1px solid var(--ab-border);
  background: var(--ab-bg-card);
  padding: 28px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-team__unit:hover {
  border-color: var(--color-gold);
  transform: translateY(-4px);
}

.page-about .about-team__code {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-gold);
  border: 1px solid var(--ab-border);
  padding: 2px 8px;
  margin-bottom: 14px;
}

.page-about .about-team__unit h3 {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-paper);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}

.page-about .about-team__unit p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-body);
  margin: 0;
}

/* ---------- 内链导航 ---------- */
.page-about .about-nexus {
  margin-top: 104px;
  padding-top: 40px;
  border-top: 1px solid var(--ab-border);
  display: grid;
  gap: 28px;
}

.page-about .about-nexus__intro .caption {
  font-size: 12px;
  color: var(--color-orange);
  margin: 0 0 8px;
  letter-spacing: 0.08em;
}

.page-about .about-nexus__intro p:last-child {
  font-size: 15px;
  color: var(--color-body);
  margin: 0;
  max-width: 48ch;
}

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

/* ---------- 桌面端增强 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1fr 1.1fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-hero__media {
    margin-left: 0;
  }

  .page-about .about-tech__columns {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-tech__item--right {
    margin-top: 56px;
  }

  .page-about .about-tech__media {
    margin-left: auto;
  }

  .page-about .about-trust__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .about-trust__partners {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-team__grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
  }

  .page-about .about-team__unit {
    grid-column: span 3;
  }

  .page-about .about-team__unit--wide {
    grid-column: span 6;
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 24px;
    align-items: center;
  }

  .page-about .about-team__unit--wide .about-team__code {
    margin-bottom: 0;
  }

  .page-about .about-nexus {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}