.page-about {
  --ab-cut: 20px;
  --ab-gap: clamp(18px, 3vw, 32px);
}

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

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  padding: clamp(40px, 7vw, 88px) 0 clamp(30px, 5vw, 56px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(58% 52% at 10% 0%, rgba(53, 230, 210, 0.10), transparent 68%),
    radial-gradient(42% 46% at 94% 14%, rgba(232, 180, 87, 0.09), transparent 70%);
}

.page-about .ab-hero .lt-shell {
  position: relative;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .ab-hero__lead .lt-lead {
  margin-top: 16px;
  max-width: 38em;
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: linear-gradient(160deg, var(--panel-2), var(--panel));
}

.page-about .ab-fact__num {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
  color: var(--cyan);
  text-shadow: 0 0 18px rgba(53, 230, 210, 0.28);
}

.page-about .ab-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--fog);
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ============ 时间轴 ============ */
.page-about .ab-rail {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .ab-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail__item {
  margin: 0;
  flex: 0 0 auto;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 18px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  color: var(--fog);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s ease-out, border-color 0.22s ease-out, background 0.22s ease-out;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--ivory);
  border-color: var(--line-cyan);
}

.page-about .ab-rail__year {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.page-about .ab-rail__word {
  font-size: 14px;
}

.page-about .ab-card {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  background: linear-gradient(155deg, var(--panel-2) 0%, var(--panel) 62%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan-dim);
  transition: border-color 0.28s ease-out, transform 0.28s ease-out;
  scroll-margin-top: calc(var(--header-h) + 32px);
}

.page-about .ab-card + .ab-card {
  margin-top: 20px;
}

.page-about .ab-card:hover {
  border-left-color: var(--cyan);
  border-top-color: var(--line-gold);
  transform: translateY(-3px);
}

.page-about .ab-card .lt-h3 {
  margin-top: 14px;
}

.page-about .ab-card__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 9px;
}

.page-about .ab-card__list li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--fog);
}

.page-about .ab-card__k {
  color: var(--gold);
  font-size: 16px;
  margin-right: 6px;
}

@media (min-width: 960px) {
  .page-about .ab-rail {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-rail__aside {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 6px;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line-gold);
  }

  .page-about .ab-rail__item {
    flex: 0 0 auto;
  }

  .page-about .ab-rail__link {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 14px 0 14px 22px;
    background: none;
    border: 0;
    white-space: normal;
  }

  .page-about .ab-rail__link::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 50%;
    width: 9px;
    height: 9px;
    margin-top: -5px;
    border-radius: 50%;
    background: var(--bg);
    border: 1px solid var(--gold-dim);
    transition: background 0.22s ease-out, border-color 0.22s ease-out, box-shadow 0.22s ease-out;
  }

  .page-about .ab-rail__link:hover::before,
  .page-about .ab-rail__link:focus-visible::before {
    background: var(--cyan);
    border-color: var(--cyan);
    box-shadow: 0 0 0 5px rgba(53, 230, 210, 0.16);
  }
}

/* ============ 三层归档 ============ */
.page-about .ab-arch__banner {
  margin-top: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line-cyan);
  overflow: hidden;
}

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

.page-about .ab-arch__panel {
  padding: 22px 20px 24px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan-dim);
  transition: border-color 0.26s ease-out, background 0.26s ease-out, transform 0.26s ease-out;
}

.page-about .ab-arch__panel:hover {
  border-top-color: var(--cyan);
  background: var(--panel);
  transform: translateY(-4px);
}

.page-about .ab-arch__idx {
  display: block;
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.14em;
  margin-bottom: 10px;
}

.page-about .ab-arch__panel .lt-h3 {
  margin-bottom: 10px;
}

@media (min-width: 880px) {
  .page-about .ab-arch__panels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: -56px;
    padding: 0 clamp(0px, 5vw, 64px);
    position: relative;
    z-index: 2;
  }

  .page-about .ab-arch__panel:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .ab-arch__panel:nth-child(3) {
    margin-top: 60px;
  }
}

/* ============ 团队分工 ============ */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .ab-team__media {
  margin-top: 26px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-team__tabs .lt-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .ab-team__tabs .lt-tabs__tab {
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--fog);
  background: var(--panel);
  border: 1px solid var(--line);
  cursor: pointer;
  appearance: none;
  transition: color 0.22s ease-out, border-color 0.22s ease-out, background 0.22s ease-out;
}

.page-about .ab-team__tabs .lt-tabs__tab:hover {
  color: var(--ivory);
  border-color: var(--line-cyan);
}

.page-about .ab-team__tabs .lt-tabs__tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-team__tabs .lt-tabs__tab[aria-selected="true"] {
  color: var(--bg);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .ab-team__tabs .lt-tabs__panel {
  padding: clamp(22px, 3vw, 30px);
  background: linear-gradient(150deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan-dim);
}

.page-about .ab-team__tabs .lt-tabs__panel .lt-h3 {
  margin-bottom: 12px;
}

.page-about .ab-team__tabs .lt-tabs__panel p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
  max-width: 42em;
}

.page-about .ab-team__tabs .lt-tabs__panel p:last-child {
  margin-bottom: 0;
}

@media (min-width: 920px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }
}

/* ============ 版本节奏 ============ */
.page-about .ab-version__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .ab-version__media {
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-spec {
  margin: 26px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-spec__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-spec__key {
  margin: 0;
  font-size: 14px;
  color: var(--fog);
}

.page-about .ab-spec__val {
  margin: 0;
  font-size: 16px;
  color: var(--ivory);
  text-align: right;
}

.page-about .ab-version__text .lt-btn {
  margin-top: 26px;
}

@media (min-width: 920px) {
  .page-about .ab-version__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 52px;
    align-items: center;
  }
}

/* ============ 内容共建 ============ */
.page-about .ab-partner__panel {
  padding: clamp(26px, 4vw, 44px);
  background: linear-gradient(135deg, var(--panel-2), var(--bg-soft));
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold-dim);
}

.page-about .ab-partner__panel .lt-h2 {
  margin-top: 12px;
}

/* ============ 长期投入 ============ */
.page-about .ab-total__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 34px);
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .ab-total__cell {
  padding: 24px 22px 26px;
  background: var(--panel);
}

.page-about .ab-total__num {
  display: block;
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .ab-total__label {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--ivory);
  margin-bottom: 8px;
}

.page-about .ab-total__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--fog);
}

@media (min-width: 720px) {
  .page-about .ab-total__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ============ 收尾引导 ============ */
.page-about .ab-cta {
  padding: clamp(36px, 6vw, 72px) 0 clamp(48px, 8vw, 96px);
}

.page-about .ab-cta__panel {
  position: relative;
  padding: clamp(28px, 5vw, 52px);
  background: linear-gradient(140deg, var(--panel-2) 0%, var(--panel) 55%, rgba(27, 127, 121, 0.22) 100%);
  border: 1px solid var(--line-cyan);
}

.page-about .ab-cta__panel::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--gold-dim), var(--cyan), transparent);
}

.page-about .ab-cta__panel .lt-prose {
  margin-top: 14px;
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ============ 动效收敛 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-card:hover,
  .page-about .ab-arch__panel:hover {
    transform: none;
  }

  .page-about .ab-card,
  .page-about .ab-arch__panel,
  .page-about .ab-rail__link,
  .page-about .ab-team__tabs .lt-tabs__tab {
    transition: opacity 0.18s ease-out;
  }
}