.page-about {
  --ab-glow: rgba(53, 240, 224, 0.14);
  --ab-violet-glow: rgba(138, 92, 255, 0.16);
  padding-bottom: 48px;
}

.page-about .ab-hero {
  margin: 26px 0 0;
}

.page-about .ab-hero__frame {
  position: relative;
  padding: 32px 20px 28px;
  border: 1px solid var(--line);
  background:
    radial-gradient(115% 130% at 6% 0%, var(--ab-glow), transparent 58%),
    radial-gradient(120% 150% at 100% 104%, var(--ab-violet-glow), transparent 60%),
    var(--ink-800);
}

.page-about .ab-hero__frame::before,
.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  width: 34px;
  height: 34px;
  border: 2px solid var(--cyan);
  opacity: 0.72;
  pointer-events: none;
}

.page-about .ab-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about h1 {
  margin: 0;
  font-size: clamp(28px, 7.2vw, 54px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-stat {
  background: var(--ink-900);
  padding: 14px 14px 16px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 25px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-stat__num em {
  font-style: normal;
  font-size: 13px;
  color: var(--cyan);
  margin-left: 4px;
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 纵向轨道 ---------- */

.page-about .ab-flow {
  margin-top: 44px;
}

.page-about .ab-stop {
  position: relative;
  margin-left: 15px;
  padding: 28px 0 28px 30px;
  border-left: 1px solid var(--line);
}

.page-about .ab-stop:first-child {
  padding-top: 8px;
}

.page-about .ab-stop__idx {
  position: absolute;
  left: -15px;
  top: 30px;
  width: 29px;
  height: 29px;
  display: grid;
  place-items: center;
  background: var(--ink-900);
  border: 1px solid var(--line);
  color: var(--cyan);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.06em;
}

.page-about .ab-stop:first-child .ab-stop__idx {
  top: 10px;
}

.page-about .ab-stop__title {
  margin: 0;
  font-size: clamp(22px, 5vw, 32px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-stop__body {
  margin-top: 14px;
  max-width: 64ch;
}

.page-about .ab-stop__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-stop__body p + p {
  margin-top: 12px;
}

/* ---------- 版本刻度轴 ---------- */

.page-about .ab-veraxis {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
}

.page-about .ab-veraxis li {
  position: relative;
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.page-about .ab-veraxis li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .ab-veraxis a {
  display: block;
  padding: 13px 0;
  color: inherit;
  text-decoration: none;
  transition: transform 0.22s var(--ease);
}

.page-about .ab-veraxis a .mono {
  display: block;
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .ab-veraxis a span + span {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-veraxis a:hover,
.page-about .ab-veraxis a:focus-visible {
  transform: translateX(4px);
}

.page-about .ab-verlist {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-ver {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .ab-ver:target {
  border-color: var(--cyan);
  background: linear-gradient(155deg, rgba(53, 240, 224, 0.13), var(--ink-800) 72%);
}

.page-about .ab-ver p.ab-ver__tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .ab-ver h3 {
  margin: 8px 0 0;
  font-size: 17px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .ab-ver p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  display: grid;
  gap: 22px;
  margin-top: 22px;
}

.page-about .media img {
  max-width: 100%;
  height: auto;
}

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

.page-about .ab-lines__item {
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.page-about .ab-lines__item:nth-child(1) {
  border-left-color: var(--cyan);
}

.page-about .ab-lines__item:nth-child(2) {
  border-left-color: var(--violet);
}

.page-about .ab-lines__item:nth-child(3) {
  border-left-color: var(--lime);
}

.page-about .ab-lines__item:nth-child(4) {
  border-left-color: var(--orange);
}

.page-about .ab-lines__name {
  margin: 0;
  font-size: 16px;
  color: var(--white);
}

.page-about .ab-lines__item p {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 生态 ---------- */

.page-about .ab-eco {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

.page-about .ab-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-nodes li {
  background: var(--ink-900);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .ab-nodes__num {
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .ab-nodes__num--violet {
  color: var(--violet);
}

.page-about .ab-nodes__num--lime {
  color: var(--lime);
}

.page-about .ab-nodes__title {
  margin: 0;
  font-size: 16px;
  color: var(--white);
}

.page-about .ab-nodes li p {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 服务半径 ---------- */

.page-about .ab-zones {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .ab-zone {
  padding: 20px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
}

.page-about .ab-zone:nth-child(2) {
  border-top-color: var(--violet);
}

.page-about .ab-zone:nth-child(3) {
  border-top-color: var(--lime);
}

.page-about .ab-zone__code {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ab-zone h3 {
  margin: 8px 0 0;
  font-size: 18px;
  color: var(--white);
}

.page-about .ab-zone p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 年度方向 ---------- */

.page-about .ab-road {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-road li {
  background: var(--ink-900);
  padding: 18px;
}

.page-about .ab-road h3 {
  margin: 0;
  font-size: 16px;
  color: var(--white);
}

.page-about .ab-road p {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 收束 ---------- */

.page-about .ab-cta {
  margin-top: 44px;
  padding: 30px 20px;
  border: 1px solid var(--line);
  background:
    linear-gradient(115deg, rgba(53, 240, 224, 0.14), rgba(138, 92, 255, 0.12) 52%, transparent 100%),
    var(--ink-800);
}

.page-about .ab-cta h2 {
  margin: 0;
  font-size: clamp(20px, 4.8vw, 28px);
  line-height: 1.28;
  color: var(--white);
}

.page-about .ab-cta p {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero__frame {
    padding: 40px 34px 34px;
  }

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

  .page-about .ab-cta {
    padding: 38px 34px;
  }
}

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

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

@media (min-width: 860px) {
  .page-about .ab-veraxis {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-veraxis li {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 26px 16px 0 0;
  }

  .page-about .ab-veraxis li::before {
    left: 0;
    top: -5px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .ab-eco {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    gap: 36px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-stop {
    margin-left: 46px;
    padding: 46px 0 46px 48px;
  }

  .page-about .ab-stop:first-child {
    padding-top: 18px;
  }

  .page-about .ab-stop__idx {
    left: -46px;
    width: 46px;
    height: 18px;
    background: transparent;
    border: 0;
    border-right: 1px solid var(--line);
    justify-items: end;
    font-size: 12px;
    letter-spacing: 0.14em;
  }

  .page-about .ab-stop__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-veraxis a {
    transition: none;
  }

  .page-about .ab-veraxis a:hover,
  .page-about .ab-veraxis a:focus-visible {
    transform: none;
  }
}