.page-about {
  --ab-paper: #F3F1E7;
  --ab-ink-deep: #071A14;
  --ab-paper-ink-2: rgba(7, 26, 20, 0.66);
  background: var(--a8-bg);
  color: var(--a8-ink);
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 20px 0 48px;
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -12vw;
  width: min(560px, 78vw);
  height: 460px;
  background: rgba(53, 242, 208, 0.06);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 32px;
  margin-top: 24px;
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 8.4vw, 58px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__dek {
  margin: 18px 0 0;
  max-width: 44ch;
  color: var(--a8-ink-2);
  font-size: 16px;
  line-height: 1.85;
}

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

.page-about .ab-hero__rail {
  display: none;
}

/* 年份色板 */
.page-about .ab-hero__plate {
  position: relative;
}

.page-about .ab-yearplate {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 28px 26px 34px;
  background: var(--ab-paper);
  color: var(--ab-ink-deep);
  clip-path: polygon(0 0, 100% 0, 100% 84%, 88% 100%, 0 100%);
}

.page-about .ab-yearplate__kicker {
  font-family: var(--a8-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(7, 26, 20, 0.5);
}

.page-about .ab-yearplate__year {
  font-family: var(--a8-mono);
  font-size: clamp(50px, 16vw, 94px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.05em;
}

.page-about .ab-yearplate__year--from {
  color: rgba(7, 26, 20, 0.3);
}

.page-about .ab-yearplate__rule {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0;
}

.page-about .ab-yearplate__rule span {
  flex: 1;
  height: 1px;
  background: rgba(7, 26, 20, 0.22);
}

.page-about .ab-yearplate__rule em {
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(7, 26, 20, 0.55);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-block {
  padding: 52px 0;
}

.page-about .ab-title {
  margin: 12px 0 0;
  font-size: clamp(23px, 5.2vw, 38px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.015em;
}

.page-about .ab-sub {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--a8-ink-2);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--a8-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--a8-teal);
  font-weight: 600;
}

.page-about .ab-kicker::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .ab-stage {
  position: relative;
  margin-left: 5px;
  padding: 0 0 36px 28px;
  border-left: 1px solid var(--a8-line);
}

.page-about .ab-stage:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 12px;
  width: 9px;
  height: 9px;
  background: var(--a8-bg);
  border: 1px solid var(--a8-cyan);
  transform: rotate(45deg);
}

.page-about .ab-stage__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--a8-mono);
}

.page-about .ab-stage__year .a8-num {
  font-size: clamp(32px, 9vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--a8-cyan);
}

.page-about .ab-stage__year em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--a8-ink-2);
}

.page-about .ab-stage__body {
  margin-top: 12px;
}

.page-about .ab-stage__body h3 {
  margin: 0;
  font-size: clamp(18px, 4vw, 24px);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .ab-stage__body p {
  margin: 10px 0 0;
  max-width: 54ch;
  color: var(--a8-ink-2);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid,
.page-about .ab-notice__grid,
.page-about .ab-eco__grid {
  display: grid;
  gap: 32px;
}

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

.page-about .ab-roles li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--a8-line);
}

.page-about .ab-roles li:last-child {
  border-bottom: 1px solid var(--a8-line);
}

.page-about .ab-roles__num {
  font-family: var(--a8-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--a8-cyan);
  padding-top: 4px;
}

.page-about .ab-roles strong {
  display: block;
  font-size: 16px;
  font-weight: 700;
}

.page-about .ab-roles p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--a8-ink-2);
}

.page-about .ab-team__media,
.page-about .ab-notice__media,
.page-about .ab-eco__media {
  margin: 0;
}

.page-about .ab-team__media img,
.page-about .ab-notice__media img,
.page-about .ab-eco__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-eco__media {
  aspect-ratio: 3 / 4;
}

/* ---------- 折叠面板 ---------- */
.page-about .ab-details {
  margin-top: 26px;
}

.page-about .ab-details details {
  border-top: 1px solid var(--a8-line);
}

.page-about .ab-details details:last-of-type {
  border-bottom: 1px solid var(--a8-line);
}

.page-about .ab-details summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--a8-ink);
}

.page-about .ab-details summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-details summary span {
  margin-left: auto;
  font-family: var(--a8-mono);
  font-size: 13px;
  color: var(--a8-cyan);
}

.page-about .ab-details summary::after {
  content: "+";
  font-family: var(--a8-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--a8-cyan);
}

.page-about .ab-details details[open] summary::after {
  content: "–";
}

.page-about .ab-details p {
  margin: 0 0 18px;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--a8-ink-2);
}

/* ---------- 服务范围（暖白面板） ---------- */
.page-about .ab-reach {
  padding: 52px 0;
  background: var(--ab-paper);
  color: var(--ab-ink-deep);
}

.page-about .ab-reach__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-reach .ab-title {
  color: var(--ab-ink-deep);
}

.page-about .ab-reach .ab-sub {
  color: var(--ab-paper-ink-2);
}

.page-about .ab-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  background: rgba(7, 26, 20, 0.14);
  border: 1px solid rgba(7, 26, 20, 0.14);
}

.page-about .ab-stats li {
  padding: 18px 16px;
  background: var(--ab-paper);
}

.page-about .ab-stats .a8-num {
  display: block;
  font-size: clamp(28px, 6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--ab-ink-deep);
}

.page-about .ab-stats em {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ab-paper-ink-2);
}

.page-about .ab-dots {
  display: block;
  width: 100%;
  height: auto;
  color: rgba(12, 42, 32, 0.3);
  margin-top: 8px;
}

/* ---------- 联系 ---------- */
.page-about .ab-cta {
  padding: 56px 0 64px;
}

.page-about .ab-cta__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-cta__links li {
  border-top: 1px solid var(--a8-line);
}

.page-about .ab-cta__links li:last-child {
  border-bottom: 1px solid var(--a8-line);
}

.page-about .ab-cta__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 0;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.25s var(--a8-ease);
}

.page-about .ab-cta__links a:hover,
.page-about .ab-cta__links a:focus-visible {
  color: var(--a8-cyan);
}

.page-about .ab-cta__links a span {
  font-family: var(--a8-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--a8-ink-2);
}

.page-about .ab-appbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 40px;
  padding: 20px 22px;
  background: var(--a8-card);
  border: 1px solid var(--a8-line);
  border-left: 3px solid var(--a8-cyan);
}

.page-about .ab-appbar__text {
  flex: 1 1 260px;
}

.page-about .ab-appbar__text strong {
  display: block;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-about .ab-appbar__text span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--a8-ink-2);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 28px 0 72px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.82fr);
    gap: 56px;
    align-items: end;
    margin-top: 28px;
  }

  .page-about .ab-hero__plate {
    margin-bottom: 6px;
  }

  .page-about .ab-block {
    padding: 84px 0;
  }

  .page-about .ab-reach {
    padding: 84px 0;
  }

  .page-about .ab-timeline {
    margin-top: 42px;
  }

  .page-about .ab-stage {
    display: grid;
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    column-gap: 56px;
    margin-left: 0;
    padding: 30px 0 46px;
    border-left: 0;
    border-top: 1px solid var(--a8-line);
  }

  .page-about .ab-stage:first-child {
    padding-top: 0;
    border-top: 0;
  }

  .page-about .ab-stage::before {
    display: none;
  }

  .page-about .ab-stage:nth-child(2) {
    padding-left: 40px;
  }

  .page-about .ab-stage:nth-child(3) {
    padding-left: 80px;
  }

  .page-about .ab-stage__body {
    margin-top: 0;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .ab-notice__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 64px;
    align-items: center;
  }

  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .ab-reach__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 64px;
    align-items: end;
  }

  .page-about .ab-cta__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 64px;
    align-items: start;
  }
}

@media (min-width: 1240px) {
  .page-about .ab-hero__rail {
    display: block;
    position: absolute;
    top: 92px;
    right: 2px;
  }
}