.page-about {
  --ab-line: 1px solid var(--steel);
  --ab-radius: var(--radius);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--neon);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  padding: 36px 0 56px;
  border-bottom: var(--ab-line);
  position: relative;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 96px;
  height: 2px;
  background: var(--neon);
}

.page-about .ab-hero__title {
  margin: 16px 0 22px;
  font-size: clamp(38px, 9.2vw, 86px);
  line-height: 0.96;
  letter-spacing: -0.03em;
  max-width: 15ch;
}

.page-about .ab-hero__lede {
  max-width: 52ch;
  color: var(--paper);
  opacity: 0.86;
  font-size: 17px;
  line-height: 1.78;
  margin: 0 0 8px;
}

.page-about .ab-kpis {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: var(--ab-line);
  border-radius: var(--ab-radius);
  overflow: hidden;
}

.page-about .ab-kpis__item {
  background: var(--panel);
  padding: 20px 16px 22px;
  min-width: 0;
}

.page-about .ab-kpis__item:nth-child(2n) {
  background: #101828;
}

.page-about .ab-kpis__n {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 7vw, 42px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-kpis__t {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: 52px 0;
  border-bottom: var(--ab-line);
}

.page-about .ab-sec__mark {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .ab-sec__mark::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--neon), rgba(59, 255, 143, 0));
}

.page-about .ab-sec__no {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

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

.page-about .ab-sec__body p {
  color: var(--mist);
  font-size: 16px;
  line-height: 1.78;
  margin: 0 0 16px;
  max-width: 40em;
}

.page-about .ab-sec__body .h2 {
  margin: 0 0 18px;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.page-about .ab-sec__lead {
  font-size: 18px !important;
  line-height: 1.62 !important;
  color: var(--paper) !important;
  font-weight: 500;
  border-left: 2px solid var(--neon);
  padding-left: 16px;
  margin: 0 0 22px !important;
  max-width: 36em !important;
}

/* ---------- 图文分栏 ---------- */

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 6px;
}

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

.page-about .ab-split__text p:last-child {
  margin-bottom: 0;
}

/* ---------- 媒体容器 ---------- */

.page-about .media {
  display: block;
  position: relative;
  overflow: hidden;
  border: var(--ab-line);
  border-radius: var(--ab-radius);
  background: var(--panel);
}

.page-about .media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(243, 239, 228, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(243, 239, 228, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about .media--16x9 { aspect-ratio: 16 / 9; }
.page-about .media--4x3 { aspect-ratio: 4 / 3; }
.page-about .media--1x1 { aspect-ratio: 1 / 1; }

.page-about .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

/* ---------- 四步流程 ---------- */

.page-about .ab-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .ab-flow__item {
  position: relative;
  padding: 0 0 30px 34px;
}

.page-about .ab-flow__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 194, 75, 0.14);
}

.page-about .ab-flow__item::after {
  content: "";
  position: absolute;
  left: 11px;
  top: 22px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), rgba(59, 255, 143, 0));
}

.page-about .ab-flow__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-flow__item:last-child::after {
  display: none;
}

.page-about .ab-flow__time {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal);
  border: 1px solid rgba(255, 194, 75, 0.36);
  border-radius: 2px;
  padding: 3px 8px;
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-flow__title {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-flow__text {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.76;
  max-width: 42em;
}

.page-about .ab-flow__fig {
  margin: 34px 0 0;
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-team__card {
  min-width: 0;
  border: var(--ab-line);
  border-radius: var(--ab-radius);
  padding: 22px 20px 24px;
  background: var(--panel);
}

.page-about .ab-team__card--glass {
  background:
    linear-gradient(158deg, rgba(15, 59, 49, 0.72) 0%, rgba(10, 16, 32, 0.52) 62%),
    var(--panel);
  box-shadow: inset 0 1px 0 var(--glass-hi);
  border-color: rgba(59, 255, 143, 0.22);
}

.page-about .ab-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
  margin-bottom: 14px;
}

.page-about .ab-team__title {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .ab-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 术语表 ---------- */

.page-about .ab-terms {
  margin: 0;
  border-top: var(--ab-line);
}

.page-about .ab-terms__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 16px 0;
  border-bottom: var(--ab-line);
}

.page-about .ab-terms__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--signal);
  border-left: 2px solid var(--signal);
  padding-left: 10px;
  line-height: 1.5;
}

.page-about .ab-terms__val {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */

.page-about .ab-track {
  list-style: none;
  margin: 26px 0 0;
  padding: 4px 0 16px;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--steel) transparent;
}

.page-about .ab-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .ab-track::-webkit-scrollbar-thumb {
  background: var(--steel);
  border-radius: 3px;
}

.page-about .ab-track__item {
  flex: 0 0 78vw;
  max-width: 300px;
  scroll-snap-align: start;
  border: var(--ab-line);
  border-left: 2px solid var(--neon);
  border-radius: var(--ab-radius);
  background: var(--panel);
  padding: 20px 18px 22px;
  min-width: 0;
}

.page-about .ab-track__gen {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--neon);
  margin-bottom: 10px;
}

.page-about .ab-track__title {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
  line-height: 1.3;
}

.page-about .ab-track__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 原则 ---------- */

.page-about .ab-rules {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: var(--ab-line);
}

.page-about .ab-rules__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: var(--ab-line);
}

.page-about .ab-rules__idx {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--blaze);
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-rules__title {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--paper);
  line-height: 1.32;
}

.page-about .ab-rules__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
  max-width: 42em;
}

/* ---------- 结尾动作 ---------- */

.page-about .ab-cta {
  margin-top: 32px;
  padding: 24px 20px 26px;
  border: 1px solid rgba(59, 255, 143, 0.28);
  border-radius: var(--ab-radius);
  background:
    linear-gradient(140deg, rgba(15, 59, 49, 0.66) 0%, rgba(10, 16, 32, 0.5) 70%),
    var(--panel);
  box-shadow: inset 0 1px 0 var(--glass-hi);
}

.page-about .ab-cta__text {
  margin: 0 0 18px;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.74;
  max-width: 46em;
}

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

.page-about .ab-cta .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 20px;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: 2px;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .ab-cta .btn--neon {
  background: var(--neon);
  color: #06131a;
  font-weight: 600;
}

.page-about .ab-cta .btn--neon:hover {
  transform: translateY(-1px);
  background: #6bffab;
}

.page-about .ab-cta .btn--ghost {
  border-color: var(--steel);
  color: var(--paper);
  background: transparent;
}

.page-about .ab-cta .btn--ghost:hover {
  border-color: var(--neon);
  color: var(--neon);
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about .ab-kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .ab-split--rev {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.4fr);
  }

  .page-about .ab-split--rev .ab-split__fig {
    order: 0;
  }

  .page-about .ab-terms__row {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

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

  .page-about .ab-flow {
    max-width: 60em;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 980px) {
  .page-about .ab-hero {
    padding: 52px 0 72px;
  }

  .page-about .ab-kpis {
    margin-top: 48px;
  }

  .page-about .ab-sec {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 44px;
    padding: 76px 0;
  }

  .page-about .ab-sec__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .ab-sec__mark::after {
    flex: none;
    width: 46px;
    height: 3px;
    background: var(--neon);
  }

  .page-about .ab-sec__no {
    font-size: 52px;
  }

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

  .page-about .ab-flow__item {
    padding-left: 42px;
  }

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

  .page-about .ab-track__item {
    flex-basis: 268px;
  }
}

@media (min-width: 1240px) {
  .page-about .ab-sec {
    grid-template-columns: 128px minmax(0, 1fr);
  }

  .page-about .ab-track__item {
    flex-basis: 292px;
  }
}

/* ---------- 降低动效 ---------- */

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

  .page-about .ab-track {
    scroll-behavior: auto;
  }
}