.page-about {
  --ab-card: rgba(12, 42, 74, 0.55);
  --ab-card-solid: rgba(6, 21, 40, 0.84);
  --ab-radius: 20px;
  --ab-rule: 1px solid var(--line);
  background:
    radial-gradient(920px 460px at 92% -6%, rgba(53, 242, 193, 0.10), transparent 62%),
    radial-gradient(720px 400px at -12% 30%, rgba(255, 184, 77, 0.06), transparent 60%),
    var(--ink);
  color: var(--ice);
  overflow-x: hidden;
}

.page-about * {
  min-width: 0;
}

.page-about .breadcrumb {
  padding: 14px 0 0;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--mint);
}

.page-about .breadcrumb__current {
  color: var(--ice);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 16px 0 0;
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  gap: 26px;
  padding: 26px 20px 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(158deg, rgba(18, 71, 107, 0.42), rgba(6, 21, 40, 0.94) 58%);
}

.page-about .ab-hero__inner::before,
.page-about .ab-hero__inner::after {
  content: "";
  position: absolute;
  width: 30px;
  height: 30px;
  border: 2px solid var(--mint);
  pointer-events: none;
}

.page-about .ab-hero__inner::before {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-lg);
}

.page-about .ab-hero__inner::after {
  right: -2px;
  bottom: -2px;
  border-top: 0;
  border-left: 0;
  border-bottom-right-radius: var(--radius-lg);
}

.page-about .ab-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 8.6vw, 68px);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--ice);
}

.page-about .ab-hero__lede {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

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

.page-about .ab-board__cell {
  padding: 16px 14px 15px;
  background: var(--ab-card-solid);
}

.page-about .ab-board__num {
  margin: 0;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-board__unit {
  margin-left: 3px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .ab-board__cap {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-section:first-of-type {
  border-top: 0;
}

.page-about .ab-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 5.4vw, 42px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-section__head {
  margin-bottom: 26px;
}

.page-about .ab-section__intro {
  max-width: 62ch;
}

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

.page-about .ab-figure .media-frame {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .ab-figure .media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 21, 40, 0) 55%, rgba(6, 21, 40, 0.6));
  pointer-events: none;
}

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

.page-about .ab-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-left: 2px solid var(--gold);
  padding-left: 10px;
}

/* ---------- 品牌起点 ---------- */
.page-about .ab-origin__grid {
  display: grid;
  gap: 24px;
}

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

.page-about .ab-origin__notes li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 12px 14px;
  background: var(--ab-card-solid);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ice);
}

.page-about .ab-origin__no {
  color: var(--mint);
  font-size: 12px;
  flex: 0 0 auto;
}

/* ---------- 四条内容线 ---------- */
.page-about .ab-chapters__grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-timeline__list {
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .ab-timeline .accordion__item {
  position: relative;
  padding-left: 18px;
  border-left: 1px solid var(--line-strong);
}

.page-about .ab-timeline .accordion__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--mist);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .ab-timeline .accordion__item[data-open]::before {
  background: var(--mint);
  border-color: var(--mint);
  box-shadow: 0 0 0 4px var(--mint-soft);
}

.page-about .ab-timeline__trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ab-card);
  color: var(--ice);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .ab-timeline__trigger:hover {
  border-color: var(--line-strong);
  background: rgba(18, 71, 107, 0.5);
}

.page-about .ab-timeline__stage {
  flex: 0 0 auto;
  padding: 3px 9px;
  border-radius: var(--pill);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--gold);
}

.page-about .ab-timeline__title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .ab-timeline__panel {
  padding: 10px 2px 4px;
}

.page-about .ab-timeline__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-timeline .accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
}

.page-about .ab-timeline .accordion__icon::before,
.page-about .ab-timeline .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--mint);
  transition: transform 0.28s var(--ease);
}

.page-about .ab-timeline .accordion__icon::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-about .ab-timeline .accordion__icon::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-about .ab-timeline .accordion__item[data-open] .accordion__icon::after {
  transform: scaleY(0);
}

.page-about .ab-timeline__controls,
.page-about .ab-upgrade__controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.page-about .ab-mini {
  font-size: 12px;
  padding: 7px 14px;
}

/* 内容线索引 */
.page-about .ab-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .ab-index__link {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: start;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ab-card-solid);
  color: var(--ice);
  text-decoration: none;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  transform: translateX(4px);
  border-color: var(--mint);
  background: rgba(53, 242, 193, 0.08);
}

.page-about .ab-index__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  font-size: 12px;
  color: var(--ink);
  background: var(--mint);
}

.page-about .ab-index__body {
  display: block;
}

.page-about .ab-index__name {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .ab-index__desc {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- V2.0 ---------- */
.page-about .ab-figure--upgrade {
  margin-bottom: 22px;
}

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

.page-about .ab-upgrade__item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ab-card-solid);
  overflow: hidden;
}

.page-about .ab-upgrade__item[data-open] {
  border-color: rgba(53, 242, 193, 0.45);
}

.page-about .ab-upgrade__trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 14px 15px;
  border: 0;
  background: transparent;
  color: var(--ice);
  text-align: left;
  cursor: pointer;
}

.page-about .ab-upgrade__no {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--gold);
}

.page-about .ab-upgrade__title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.page-about .ab-upgrade__delta {
  flex: 0 0 auto;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  font-size: 11px;
  color: var(--mint);
}

.page-about .ab-upgrade .accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
}

.page-about .ab-upgrade .accordion__icon::before,
.page-about .ab-upgrade .accordion__icon::after {
  content: "";
  position: absolute;
  background: var(--mint);
  transition: transform 0.28s var(--ease);
}

.page-about .ab-upgrade .accordion__icon::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-about .ab-upgrade .accordion__icon::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-about .ab-upgrade .accordion__item[data-open] .accordion__icon::after {
  transform: scaleY(0);
}

.page-about .ab-upgrade__panel {
  padding: 0 15px 16px;
}

.page-about .ab-upgrade__row {
  display: grid;
  gap: 4px;
  margin: 0 0 8px;
  padding: 11px 12px;
  border-radius: 10px;
  background: rgba(147, 169, 198, 0.08);
}

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

.page-about .ab-upgrade__row--after {
  background: rgba(53, 242, 193, 0.10);
}

.page-about .ab-upgrade__k {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .ab-upgrade__row--after .ab-upgrade__k {
  color: var(--mint);
}

.page-about .ab-upgrade__v {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ice);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: 24px;
}

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

.page-about .ab-team__list li {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 11px 14px;
  background: var(--ab-card-solid);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-team__tag {
  flex: 0 0 auto;
  padding: 3px 9px;
  border-radius: var(--pill);
  border: 1px solid rgba(53, 242, 193, 0.4);
  font-size: 11px;
  color: var(--mint);
}

/* ---------- 里程碑 ---------- */
.page-about .ab-milestones__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
}

.page-about .ab-milestones__cell {
  padding: 18px 15px;
  background: linear-gradient(170deg, rgba(18, 71, 107, 0.5), rgba(6, 21, 40, 0.9));
}

.page-about .ab-milestones__num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(30px, 8vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-milestones__unit {
  color: var(--mint);
  font-size: 0.6em;
  margin-left: 2px;
}

.page-about .ab-milestones__cap {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-milestones__note {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 2px solid var(--split-b);
}

/* ---------- 咨询衔接 ---------- */
.page-about .ab-connect__panel {
  display: grid;
  gap: 24px;
  padding: 24px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(150deg, rgba(23, 96, 95, 0.34), rgba(12, 42, 74, 0.62) 55%, rgba(6, 21, 40, 0.92));
}

.page-about .ab-connect__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .ab-connect__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .ab-connect__row {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  background: rgba(6, 21, 40, 0.7);
}

.page-about .ab-connect__row dt {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .ab-connect__row dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ice);
  word-break: break-word;
}

.page-about .ab-connect__row dd a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 193, 0.5);
}

.page-about .ab-connect__row dd a:hover {
  color: var(--mint);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__inner {
    padding: 32px 30px 30px;
  }

  .page-about .ab-board__num {
    font-size: 34px;
  }

  .page-about .ab-section {
    padding: 56px 0;
  }

  .page-about .ab-hero__lede,
  .page-about .ab-p {
    font-size: 16px;
  }

  .page-about .ab-origin__notes li,
  .page-about .ab-team__list li {
    font-size: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
    gap: 34px;
    padding: 40px 36px 38px;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 34px;
  }

  .page-about .ab-chapters__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 34px;
  }

  .page-about .ab-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

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

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 34px;
  }

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

  .page-about .ab-connect__panel {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    padding: 32px 30px;
    gap: 30px;
  }
}

@media (min-width: 1120px) {
  .page-about .ab-hero__title {
    font-size: clamp(48px, 5.4vw, 76px);
  }

  .page-about .ab-board__cell {
    padding: 20px 18px;
  }

  .page-about .ab-upgrade__title {
    font-size: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .ab-timeline__trigger,
  .page-about .ab-timeline .accordion__icon::before,
  .page-about .ab-timeline .accordion__icon::after,
  .page-about .ab-upgrade .accordion__icon::before,
  .page-about .ab-upgrade .accordion__icon::after {
    transition: none;
  }

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