.page-about {
  --ab-rail-w: 272px;
  background: var(--hq-paper);
  color: var(--hq-ink);
  font-family: var(--hq-font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 20px 0 88px;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 64px;
  background: linear-gradient(100deg, var(--hq-blue) 0%, var(--hq-ink) 100%);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 0;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__copy {
  max-width: 640px;
  margin-top: 24px;
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-family: var(--hq-font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__lead {
  margin: 20px 0 0;
  font-size: 16px;
  color: rgba(20, 33, 43, 0.82);
  max-width: 58ch;
}

.page-about .ab-hero__aside {
  margin: 22px 0 0;
  font-size: 15px;
  color: var(--hq-ink);
}

.page-about .ab-hero__aside a {
  color: var(--hq-blue);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--hq-orange);
  padding-bottom: 2px;
}

.page-about .ab-hero__aside a:hover {
  color: var(--hq-orange);
  border-bottom-color: var(--hq-blue);
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 26px 0 64px;
  }

  .page-about .ab-hero::after {
    left: auto;
    right: -70px;
    top: -46px;
    bottom: -46px;
    height: auto;
    width: min(46%, 560px);
    background: linear-gradient(155deg, var(--hq-blue) 0%, var(--hq-ink) 100%);
    clip-path: polygon(22% 0, 100% 0, 100% 100%, 0 100%);
  }
}

/* ---------- 主体栅格 ---------- */
.page-about .ab-body {
  padding: 8px 0 56px;
}

.page-about .ab-body__grid {
  display: grid;
  gap: 30px;
}

@media (min-width: 960px) {
  .page-about .ab-body__grid {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 92px;
  }
}

/* ---------- 侧栏索引与数字 ---------- */
.page-about .ab-rail {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about .ab-rail__card {
  background: var(--hq-sand);
  border-radius: 18px 18px 18px 5px;
  padding: 20px 18px;
}

.page-about .ab-rail__label {
  margin: 0 0 12px;
  font-family: var(--hq-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--hq-blue);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 8px;
  border-left: 3px solid transparent;
  color: var(--hq-ink);
  font-size: 14px;
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  background: rgba(11, 79, 138, 0.1);
  border-left-color: var(--hq-orange);
}

.page-about .ab-rail__no {
  font-family: var(--hq-font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--hq-orange);
}

.page-about .ab-rail__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 0 4px;
}

.page-about .ab-stat {
  border-left: 3px solid var(--hq-blue);
  padding-left: 12px;
}

.page-about .ab-stat__num {
  display: block;
  font-size: 21px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--hq-blue);
}

.page-about .ab-stat__cap {
  display: block;
  margin-top: 3px;
  font-size: 12.5px;
  color: rgba(20, 33, 43, 0.7);
}

@media (min-width: 960px) {
  .page-about .ab-rail__stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }
}

@media (max-width: 959px) {
  .page-about .ab-rail__list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }

  .page-about .ab-rail__link {
    flex: none;
    white-space: nowrap;
    border-left: 0;
    border-bottom: 3px solid transparent;
    border-radius: 10px 10px 0 0;
    background: rgba(246, 241, 231, 0.6);
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--hq-orange);
  }
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  margin-top: 40px;
  padding-top: 38px;
  border-top: 1px solid var(--hq-line);
}

.page-about .ab-sec:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-sec__no {
  margin: 0;
  font-family: var(--hq-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--hq-orange);
}

.page-about .ab-sec h2 {
  margin: 8px 0 0;
  font-family: var(--hq-font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .ab-sec__lead {
  margin: 12px 0 0;
  font-size: 16px;
  color: rgba(20, 33, 43, 0.78);
  max-width: 60ch;
}

.page-about .ab-text {
  margin: 16px 0 0;
  font-size: 16px;
  color: rgba(20, 33, 43, 0.84);
  max-width: 62ch;
}

.page-about .ab-figure {
  margin: 24px 0 0;
}

.page-about .hq-media {
  margin-inline: 0;
  overflow: hidden;
  border-radius: 16px;
  background: var(--hq-mist);
}

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

/* ---------- 时间线 ---------- */
.page-about .ab-milestones {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .ab-milestone {
  position: relative;
  padding: 2px 0 26px 24px;
  border-left: 2px solid var(--hq-mist);
}

.page-about .ab-milestone::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--hq-orange);
  box-shadow: 0 0 0 3px var(--hq-paper);
}

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

.page-about .ab-milestone__year {
  display: block;
  font-family: var(--hq-font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--hq-blue);
}

.page-about .ab-milestone__title {
  margin: 6px 0 0;
  font-family: var(--hq-font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-milestone__desc {
  margin: 6px 0 0;
  font-size: 15px;
  color: rgba(20, 33, 43, 0.8);
  max-width: 58ch;
}

/* ---------- 团队与能力中心 ---------- */
.page-about .ab-team {
  margin-top: 26px;
  display: grid;
  gap: 22px;
}

@media (min-width: 760px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: start;
    gap: 28px;
  }
}

.page-about .ab-centers {
  display: grid;
  gap: 10px;
}

@media (min-width: 560px) {
  .page-about .ab-centers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-center {
  background: var(--hq-mist);
  border-radius: 14px;
  padding: 14px 16px 16px;
}

.page-about .ab-center__no {
  display: block;
  font-family: var(--hq-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--hq-blue);
}

.page-about .ab-center__name {
  margin: 6px 0 0;
  font-family: var(--hq-font-display);
  font-size: 16px;
  font-weight: 700;
}

.page-about .ab-center__desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.62;
  color: rgba(20, 33, 43, 0.78);
}

/* ---------- 服务网络 ---------- */
.page-about .ab-net {
  margin-top: 26px;
  display: grid;
  gap: 22px;
}

@media (min-width: 880px) {
  .page-about .ab-net {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: start;
    gap: 28px;
  }
}

.page-about .ab-map {
  background: var(--hq-ink);
  color: var(--hq-paper);
  border-radius: 22px 22px 22px 6px;
  padding: 22px 20px;
}

.page-about .ab-map__title {
  margin: 0;
  font-family: var(--hq-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--hq-sun);
}

.page-about .ab-map__nodes {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .ab-map__node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(246, 241, 231, 0.18);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-map__node:hover,
.page-about .ab-map__node:focus-within {
  background: rgba(46, 125, 189, 0.3);
  border-color: var(--hq-sun);
}

.page-about .ab-map__region {
  font-size: 14px;
  font-weight: 600;
}

.page-about .ab-map__count {
  font-family: var(--hq-font-mono);
  font-size: 12.5px;
  color: rgba(217, 233, 245, 0.9);
}

.page-about .ab-legend {
  margin: 18px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid rgba(246, 241, 231, 0.18);
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.page-about .ab-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: rgba(246, 241, 231, 0.86);
}

.page-about .ab-legend__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: none;
}

.page-about .ab-legend__dot--blue {
  background: var(--hq-blue-light);
}

.page-about .ab-legend__dot--orange {
  background: var(--hq-orange);
}

.page-about .ab-legend__dot--green {
  background: var(--hq-green);
}

.page-about .ab-net__side .ab-text {
  margin-top: 18px;
  font-size: 15px;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

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

.page-about .ab-partner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  padding: 18px 18px 18px 18px;
  background: var(--hq-sand);
  border-left: 4px solid var(--hq-green);
  border-radius: 4px 16px 16px 16px;
}

.page-about .ab-partner__name {
  font-family: var(--hq-font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-partner__num {
  font-size: 18px;
  font-weight: 600;
  color: var(--hq-orange);
  white-space: nowrap;
}

.page-about .ab-partner__desc {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.62;
  color: rgba(20, 33, 43, 0.8);
}

/* ---------- 服务流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px dashed var(--hq-line);
}

.page-about .ab-step:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .ab-step__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--hq-blue);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
}

.page-about .ab-step h3 {
  margin: 0;
  font-family: var(--hq-font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-step p {
  margin: 6px 0 0;
  font-size: 15px;
  color: rgba(20, 33, 43, 0.8);
  max-width: 56ch;
}

/* ---------- 收束 ---------- */
.page-about .ab-close {
  padding: 6px 0 64px;
}

.page-about .ab-cta {
  background: linear-gradient(120deg, var(--hq-blue) 0%, var(--hq-ink) 100%);
  color: var(--hq-paper);
  border-radius: 24px 24px 24px 8px;
  padding: 28px 22px;
  display: grid;
  gap: 20px;
}

@media (min-width: 800px) {
  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
    padding: 36px 40px;
  }
}

.page-about .ab-cta h2 {
  margin: 0;
  font-family: var(--hq-font-display);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 800;
  line-height: 1.3;
  color: #fff;
}

.page-about .ab-cta p {
  margin: 10px 0 0;
  font-size: 15px;
  color: rgba(246, 241, 231, 0.82);
  max-width: 50ch;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-cta .hq-btn--ghost {
  color: var(--hq-paper);
  border-color: rgba(246, 241, 231, 0.55);
}

.page-about .ab-cta .hq-btn--ghost:hover,
.page-about .ab-cta .hq-btn--ghost:focus-visible {
  background: rgba(246, 241, 231, 0.14);
  border-color: var(--hq-paper);
}

/* ---------- 动效兼容 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-map__node {
    transition: none;
  }
}