.page-about {
  --ab-card-bg: #0E2C44;
  --ab-edge: rgba(30, 74, 107, 0.95);
  --ab-edge-soft: rgba(30, 74, 107, 0.5);
  background:
    radial-gradient(1100px 560px at 84% -6%, rgba(30, 74, 107, 0.38), transparent 64%),
    var(--ink);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about .ab-crumb-row {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumb {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(26px, 4.6vw, 52px) 0 clamp(32px, 5.6vw, 66px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .ab-hero__frame {
  position: relative;
  border: 1px solid var(--ab-edge);
  padding: clamp(22px, 3.6vw, 42px);
  background:
    linear-gradient(152deg, rgba(14, 44, 68, 0.94), rgba(6, 26, 43, 0.42));
}

.page-about .ab-hero__frame::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 26px;
  height: 26px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
}

.page-about .ab-hero__frame .display {
  margin: 12px 0 16px;
}

.page-about .ab-hero__lede {
  color: var(--mist);
  max-width: 62ch;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--ab-edge-soft);
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .ab-fact__num {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .ab-fact__lbl {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-hero__figure {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--ab-edge);
  background: var(--ink-2);
  position: relative;
}

.page-about .ab-hero__figure::before {
  content: "";
  position: absolute;
  top: -6px;
  right: 18px;
  width: 46px;
  height: 6px;
  background: var(--cyan);
}

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

.page-about .ab-hero__cap {
  margin: 10px 2px 0;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ---------- 双栏骨架 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 52px);
}

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

.page-about .ab-rail__cap {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-rail__cap + .ab-rail__list {
  margin-bottom: 20px;
}

.page-about .ab-rail__list {
  display: flex;
  gap: 10px;
  margin: 0 0 20px;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail__list::-webkit-scrollbar {
  height: 3px;
}

.page-about .ab-rail__list::-webkit-scrollbar-thumb {
  background: var(--grid);
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--ab-edge);
  background: var(--ink-2);
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-rail__link--wide {
  display: inline-flex;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(63, 240, 192, 0.08);
}

.page-about .ab-rail__yr {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .ab-rail__tx {
  font-size: 12.5px;
  color: var(--mist);
}

/* ---------- 内容流 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: clamp(46px, 6vw, 84px);
  min-width: 0;
}

.page-about .ab-block {
  position: relative;
  min-width: 0;
}

.page-about .ab-block__head .h2 {
  margin: 10px 0 14px;
}

.page-about .ab-block__head .prose {
  color: var(--mist);
  margin: 0;
}

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

.page-about .ab-next {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  font-size: 14px;
  font-weight: 700;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-next::after {
  content: "\2192";
  font-family: var(--font-mono);
}

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

/* ---------- 三件事 ---------- */
.page-about .ab-trio {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.page-about .ab-card {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-edge);
}

.page-about .ab-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--cyan);
  opacity: 0.7;
}

.page-about .ab-card__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .ab-card .h3 {
  margin: 10px 0 8px;
  font-size: 19px;
}

.page-about .ab-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 分区 ---------- */
.page-about .ab-zone-figure {
  margin: 26px 0 0;
  padding: 10px;
  border: 1px solid var(--ab-edge);
  background: var(--ink-2);
}

.page-about .ab-zone-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.page-about .ab-zones {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.page-about .ab-zone {
  padding: 14px 14px 16px;
  background: rgba(14, 44, 68, 0.66);
  border: 1px solid var(--ab-edge);
  border-left: 3px solid var(--grid);
  min-width: 0;
  transition: border-left-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-zone:hover,
.page-about .ab-zone:focus-within {
  border-left-color: var(--cyan);
  background: rgba(14, 44, 68, 0.95);
}

.page-about .ab-zone__code {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .ab-zone__name {
  margin: 8px 0 6px;
  font-size: 15.5px;
  font-weight: 800;
}

.page-about .ab-zone__txt {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 周期 ---------- */
.page-about .ab-cycle {
  margin-top: 28px;
}

.page-about .ab-cycle__strip {
  height: 26px;
  border: 1px solid var(--ab-edge);
  background-color: var(--ink-2);
  background-image: repeating-linear-gradient(
    90deg,
    var(--grid) 0 1px,
    rgba(30, 74, 107, 0.18) 1px calc(100% / 26)
  );
}

.page-about .ab-cycle__axis {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

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

.page-about .ab-cycle__points li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 16px;
  background: rgba(6, 26, 43, 0.72);
  border: 1px solid var(--ab-edge-soft);
  border-left: 2px solid var(--orange);
}

.page-about .ab-cycle__k {
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .ab-cycle__v {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-cycle__v b {
  color: var(--cyan);
  font-weight: 700;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.page-about .ab-tl-item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 4px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .ab-tl-item--now::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .ab-tl-year {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-tl-item--now .ab-tl-year {
  color: var(--orange);
}

.page-about .ab-tl-title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .ab-tl-txt {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-figure {
  margin: 26px 0 0;
  padding: 10px;
  border: 1px solid var(--ab-edge);
  background: var(--ink-2);
}

.page-about .ab-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.page-about .ab-team__card {
  padding: 20px 18px;
  background: rgba(6, 26, 43, 0.8);
  border: 1px solid var(--ab-edge);
  border-top: 3px solid var(--grid);
}

.page-about .ab-team__card--a {
  border-top-color: var(--cyan);
}

.page-about .ab-team__card--b {
  border-top-color: var(--orange);
}

.page-about .ab-team__card--c {
  border-top-color: var(--signal);
}

.page-about .ab-team__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .ab-team__card .h3 {
  margin: 8px 0 8px;
  font-size: 18px;
}

.page-about .ab-team__card p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-team__out {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--ab-edge-soft);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--signal);
}

/* ---------- 体验数据 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-stat {
  padding: 20px 18px;
  background: linear-gradient(150deg, rgba(14, 44, 68, 0.92), rgba(6, 26, 43, 0.7));
  border: 1px solid var(--ab-edge);
}

.page-about .ab-stat__num {
  margin: 0 0 8px;
  font-size: clamp(26px, 4.4vw, 36px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--cyan);
}

.page-about .ab-stat__lbl {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .ab-stats__note {
  margin: 20px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
  max-width: 62ch;
}

/* ---------- 合作 ---------- */
.page-about .ab-coop {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .ab-coop__item {
  padding: 22px 20px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-edge);
}

.page-about .ab-coop__num {
  margin: 0;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-coop__item .h3 {
  margin: 10px 0 8px;
  font-size: 18px;
}

.page-about .ab-coop__item p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-coop__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 62ch;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .ab-zones {
    padding-left: clamp(0px, 3vw, 40px);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .ab-body {
    grid-template-columns: 178px minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 64px);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--masthead-h) + 28px);
  }

  .page-about .ab-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__list li + li {
    margin-top: 8px;
  }

  .page-about .ab-rail__link {
    display: block;
    width: 100%;
    white-space: normal;
  }

  .page-about .ab-rail__yr {
    display: block;
    margin-bottom: 3px;
  }

  .page-about .ab-block {
    padding-left: 24px;
    border-left: 1px solid var(--ab-edge-soft);
  }

  .page-about .ab-block::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 0;
    width: 3px;
    height: 42px;
    background: var(--orange);
  }

  .page-about .ab-block:nth-child(2n) {
    margin-left: clamp(0px, 2.2vw, 34px);
  }

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

  .page-about .ab-zones {
    padding-left: clamp(0px, 6vw, 88px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-zone,
  .page-about .ab-rail__link,
  .page-about .ab-next {
    transition: none;
  }
}