.page-about {
  position: relative;
  overflow-x: clip;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about::before {
  content: "";
  position: absolute;
  top: -12%;
  left: -18%;
  right: -18%;
  height: 760px;
  background:
    radial-gradient(58% 54% at 24% 0%, rgba(107, 75, 201, 0.4), transparent 72%),
    radial-gradient(46% 46% at 84% 14%, rgba(34, 224, 214, 0.14), transparent 74%);
  pointer-events: none;
  z-index: 0;
}

.page-about > * {
  position: relative;
  z-index: 1;
}

/* ---------- 面包屑 ---------- */

.page-about .ab-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: clamp(18px, 3.4vw, 34px);
  font-family: var(--hh-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--hh-muted);
}

.page-about .ab-crumb a {
  color: var(--hh-text-soft);
  text-decoration: none;
  transition: color 0.18s ease;
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--hh-cyan);
}

.page-about .ab-crumb__sep {
  color: var(--hh-rule);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  margin-top: clamp(24px, 4.4vw, 52px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.4vw, 44px);
}

.page-about .ab-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .ab-hero__sep {
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--hh-rule);
}

.page-about .ab-hero__title {
  margin: 16px 0 0;
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--hh-white);
}

.page-about .ab-hero__lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--hh-text);
}

.page-about .ab-hero__actions {
  margin-top: 28px;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--hh-rule);
  transition: border-color 0.18s ease;
}

.page-about .ab-hero__facts li:hover {
  border-left-color: var(--hh-cyan);
}

.page-about .ab-hero__factnum {
  font-size: 24px;
  line-height: 1;
  color: var(--hh-orange);
  letter-spacing: 0.02em;
}

.page-about .ab-hero__facttext {
  font-size: 13px;
  line-height: 1.5;
  color: var(--hh-text-soft);
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
}

.page-about .ab-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(150deg, rgba(34, 224, 214, 0.75), rgba(30, 42, 63, 0.2) 48%, rgba(255, 106, 43, 0.6));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
  z-index: 3;
}

.page-about .ab-hero__caption {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 4;
  padding: 6px 14px;
  border-radius: var(--hh-pill);
  background: rgba(5, 7, 14, 0.74);
  border: 1px solid var(--hh-rule);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--hh-white);
}

/* ---------- 章节索引条 ---------- */

.page-about .ab-toc {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: clamp(34px, 5.6vw, 62px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hh-rule);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-toc::-webkit-scrollbar {
  display: none;
}

.page-about .ab-toc__label {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--hh-muted);
  padding-right: 6px;
}

.page-about .ab-toc a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 15px;
  border-radius: var(--hh-pill);
  border: 1px solid var(--hh-rule);
  background: var(--hh-panel);
  font-size: 13px;
  color: var(--hh-text-soft);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, transform 0.18s ease, background-color 0.18s ease;
}

.page-about .ab-toc a .hh-mono {
  font-size: 11px;
  color: var(--hh-muted);
  transition: color 0.18s ease;
}

.page-about .ab-toc a:hover,
.page-about .ab-toc a:focus-visible {
  color: var(--hh-white);
  border-color: var(--hh-cyan);
  background: var(--hh-panel-2);
  transform: translateY(-2px);
}

.page-about .ab-toc a:hover .hh-mono,
.page-about .ab-toc a:focus-visible .hh-mono {
  color: var(--hh-cyan);
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-sec {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(40px, 6.6vw, 84px);
}

.page-about .ab-sec__rail {
  position: relative;
  padding-top: 4px;
}

.page-about .ab-sec__rail::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 54px;
  bottom: -8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--hh-rule), rgba(30, 42, 63, 0.08));
}

.page-about .ab-sec:last-of-type .ab-sec__rail::before {
  display: none;
}

.page-about .ab-sec__num {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--hh-pill);
  border: 1px solid var(--hh-rule);
  background: var(--hh-panel);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--hh-cyan);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-sec:hover .ab-sec__num {
  border-color: var(--hh-cyan);
  background: var(--hh-panel-2);
}

.page-about .ab-sec__main {
  min-width: 0;
}

.page-about .ab-panel {
  padding: clamp(20px, 3.2vw, 40px);
  border-radius: var(--hh-radius-lg);
}

.page-about .ab-panel--accent {
  position: relative;
  overflow: hidden;
}

.page-about .ab-panel--accent::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(to bottom, var(--hh-cyan), var(--hh-orange), var(--hh-dusk));
}

.page-about .ab-sec__title {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--hh-white);
}

.page-about .ab-prose {
  margin-top: 18px;
}

.page-about .ab-prose p {
  color: var(--hh-text);
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 42px);
  align-items: start;
}

/* ---------- 索引树 ---------- */

.page-about .ab-tree-wrap {
  min-width: 0;
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: var(--hh-radius);
  border: 1px dashed var(--hh-rule);
  background: linear-gradient(180deg, rgba(17, 26, 43, 0.85), rgba(12, 18, 32, 0.6));
}

.page-about .ab-tree {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .ab-tree rect {
  fill: var(--hh-panel-2);
  stroke: var(--hh-rule);
  stroke-width: 1;
  transition: stroke 0.2s ease, fill 0.2s ease;
}

.page-about .ab-tree__node:hover rect {
  stroke: var(--hh-cyan);
  fill: rgba(34, 224, 214, 0.08);
}

.page-about .ab-tree text {
  font-family: var(--hh-sans);
  font-size: 17px;
  font-weight: 700;
  fill: var(--hh-white);
}

.page-about .ab-tree .ab-tree__sub {
  font-family: var(--hh-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.02em;
  fill: var(--hh-muted);
}

.page-about .ab-tree__link {
  stroke: var(--hh-cyan);
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
  opacity: 0.7;
}

.page-about .ab-tree__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
}

/* ---------- 团队与数据 ---------- */

.page-about .ab-split--media {
  margin-top: 18px;
}

.page-about .ab-desk {
  min-width: 0;
}

.page-about .ab-desk__media {
  margin: 0;
}

.page-about .ab-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border-radius: var(--hh-radius-sm);
  border: 1px solid var(--hh-rule);
  background: var(--hh-panel-2);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .ab-stat:hover {
  border-color: var(--hh-cyan);
  transform: translateY(-2px);
}

.page-about .ab-stat__value {
  font-size: clamp(30px, 5.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .ab-stat__value--cyan {
  color: var(--hh-cyan);
}

.page-about .ab-stat__value--orange {
  color: var(--hh-orange);
}

.page-about .ab-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--hh-text-soft);
}

/* ---------- 阵容差异 ---------- */

.page-about .ab-diff {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-diff__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--hh-radius-sm);
  border: 1px solid var(--hh-rule);
  background: rgba(12, 18, 32, 0.7);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .ab-diff__item:hover {
  border-color: var(--hh-cyan);
  transform: translateX(2px);
}

.page-about .ab-diff__item .hh-tag {
  flex: 0 0 auto;
}

.page-about .ab-diff__text {
  font-size: 14px;
  line-height: 1.72;
  color: var(--hh-text-soft);
}

.page-about .ab-inline-link {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--hh-text-soft);
}

.page-about .ab-inline-link a {
  color: var(--hh-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.35);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-about .ab-inline-link a:hover,
.page-about .ab-inline-link a:focus-visible {
  color: var(--hh-white);
  border-bottom-color: var(--hh-white);
}

/* ---------- 云南服务 ---------- */

.page-about .ab-yunnan {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.page-about .ab-yunnan li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border-radius: var(--hh-radius-sm);
  background: linear-gradient(160deg, rgba(107, 75, 201, 0.22), rgba(12, 18, 32, 0.9));
  border: 1px solid var(--hh-rule);
}

.page-about .ab-yunnan__num {
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1;
  color: var(--hh-white);
}

.page-about .ab-yunnan__num small {
  font-size: 0.45em;
  margin-left: 2px;
  color: var(--hh-text-soft);
}

.page-about .ab-yunnan__text {
  font-size: 13px;
  line-height: 1.5;
  color: var(--hh-text-soft);
}

/* ---------- 发展历程 ---------- */

.page-about .ab-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--hh-rule);
}

.page-about .ab-timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .ab-timeline__dot {
  position: absolute;
  left: -4px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--hh-cyan);
  box-shadow: 0 0 0 3px rgba(34, 224, 214, 0.14);
}

.page-about .ab-timeline__year {
  display: block;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--hh-orange);
  line-height: 1;
}

.page-about .ab-timeline__title {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--hh-white);
}

.page-about .ab-timeline__desc {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--hh-text-soft);
}

.page-about .ab-partners {
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--hh-rule);
}

.page-about .ab-partners__lead {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--hh-text);
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  margin-top: clamp(42px, 6.6vw, 84px);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 24px;
  padding: clamp(24px, 3.6vw, 44px);
  border-radius: var(--hh-radius-lg);
  background:
    radial-gradient(70% 120% at 100% 0%, rgba(34, 224, 214, 0.14), transparent 68%),
    var(--hh-panel);
}

.page-about .ab-cta__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--hh-white);
}

.page-about .ab-cta__text {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--hh-text-soft);
}

/* ---------- 响应式 ---------- */

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

  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .ab-split--media {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: stretch;
  }

  .page-about .ab-desk__media {
    align-self: stretch;
    height: 100%;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
    align-items: center;
  }

  .page-about .ab-timeline {
    position: relative;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .ab-timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 3px;
    height: 1px;
    background: linear-gradient(to right, var(--hh-cyan), var(--hh-rule) 62%, rgba(30, 42, 63, 0.1));
  }

  .page-about .ab-timeline__item {
    padding: 30px 22px 0 0;
    border-left: 0;
  }

  .page-about .ab-timeline__item:last-child {
    padding-right: 0;
  }

  .page-about .ab-timeline__dot {
    left: 0;
    top: -1px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-sec {
    grid-template-columns: 92px minmax(0, 1fr);
  }

  .page-about .ab-sec__rail::before {
    left: 21px;
  }
}

@media (max-width: 520px) {
  .page-about .ab-yunnan {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-hero__caption {
    left: 12px;
    bottom: 10px;
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-toc a,
  .page-about .ab-stat,
  .page-about .ab-diff__item,
  .page-about .ab-sec__num {
    transition: none;
  }
}