.page-about {
  --ab-gold-soft: rgba(201, 162, 39, 0.14);
  --ab-line: rgba(90, 74, 30, 0.95);
  --ab-line-soft: rgba(90, 74, 30, 0.55);
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about dl,
.page-about dd,
.page-about dt,
.page-about ol,
.page-about ul,
.page-about p,
.page-about figure {
  margin: 0;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: calc(var(--header-h) + 20px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 6vw, 76px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 74%;
  background:
    radial-gradient(120% 84% at 82% -12%, rgba(201, 162, 39, 0.16), transparent 62%),
    radial-gradient(84% 66% at 6% 6%, rgba(46, 111, 115, 0.22), transparent 70%);
  pointer-events: none;
}

.page-about .ab-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: end;
}

.page-about h1.display {
  font-size: clamp(1.95rem, 6.4vw, 4rem);
  line-height: 1.18;
  letter-spacing: -0.025em;
  margin-top: 14px;
  max-width: 22ch;
  text-wrap: balance;
}

.page-about .ab-hero-lede {
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.95;
  color: var(--paper);
  max-width: 46ch;
}

.page-about .ab-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .ab-hero-media {
  position: relative;
  margin-top: clamp(30px, 5vw, 58px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 7;
  object-fit: cover;
}

.page-about .media-caption {
  font-size: 0.82rem;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- 通用分区 ---------- */
.page-about .ab-section {
  padding: clamp(56px, 8vw, 112px) 0;
}

.page-about .ab-section--tight {
  padding-top: clamp(36px, 5vw, 62px);
}

.page-about .ab-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.2vw, 2.55rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-top: 12px;
  text-wrap: balance;
}

.page-about .ab-head .lede {
  margin-top: 16px;
}

/* ---------- 起点 ---------- */
.page-about .ab-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
}

.page-about .ab-origin-body p {
  font-size: clamp(1rem, 1.1vw, 1.06rem);
  line-height: 1.95;
  margin-bottom: 1.4em;
  max-width: 62ch;
}

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

/* ---------- 时间轴 ---------- */
.page-about .ab-jump {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(24px, 3vw, 36px) 0 clamp(32px, 5vw, 54px);
}

.page-about .ab-jump-chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .ab-jump-chip:hover,
.page-about .ab-jump-chip:focus-visible {
  color: var(--gold-light);
  border-color: var(--gold);
  background: var(--ab-gold-soft);
}

.page-about .ab-timeline {
  position: relative;
  padding: 10px 0;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(to top right, rgba(201, 162, 39, 0.1), transparent 52%);
  pointer-events: none;
}

.page-about .ab-axis {
  position: absolute;
  left: 18px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--ab-line) 10%, var(--ab-line) 90%, transparent);
}

.page-about .ab-tl {
  position: relative;
  list-style: none;
  padding: 0;
  display: grid;
  gap: clamp(30px, 4vw, 44px);
}

.page-about .ab-tl-item {
  position: relative;
  padding-left: 52px;
}

.page-about .ab-tl-dot {
  position: absolute;
  left: 11px;
  top: 9px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 6px rgba(201, 162, 39, 0.13);
  transition: box-shadow 0.32s var(--ease);
}

.page-about .ab-tl-item:hover .ab-tl-dot {
  box-shadow: 0 0 0 11px rgba(201, 162, 39, 0.2);
}

.page-about .ab-tl-era {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .ab-tl-title {
  font-family: var(--font-display);
  font-size: clamp(1.12rem, 2.2vw, 1.42rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.page-about .ab-tl-sum {
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 48ch;
}

.page-about .ab-tl-detail {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.44s var(--ease), opacity 0.3s var(--ease);
}

.page-about .ab-tl-detail > div {
  overflow: hidden;
  min-height: 0;
}

.page-about .ab-tl-detail p {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 1px solid var(--ab-line);
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 48ch;
}

.page-about .ab-tl-item:hover .ab-tl-detail,
.page-about .ab-tl-item:focus-within .ab-tl-detail {
  grid-template-rows: 1fr;
  opacity: 1;
}

/* ---------- 数据带 ---------- */
.page-about .ab-stats {
  position: relative;
  margin: clamp(24px, 4vw, 48px) 0;
  padding: clamp(48px, 7vw, 92px) 0;
  background:
    radial-gradient(92% 130% at 10% 0%, rgba(46, 111, 115, 0.24), transparent 62%),
    linear-gradient(180deg, var(--abyss), var(--ink));
  border-top: 1px solid var(--ab-line-soft);
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-stats-title {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.4vw, 2.05rem);
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.page-about .ab-stats-lede {
  margin-top: 14px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .ab-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(22px, 4vw, 42px) clamp(16px, 3vw, 40px);
  margin-top: clamp(28px, 4vw, 50px);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-stat-num {
  font-size: clamp(1.55rem, 4.2vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--gold-light);
}

.page-about .ab-stat-label {
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .ab-stats-note {
  margin-top: clamp(26px, 3.5vw, 42px);
  padding-top: 18px;
  border-top: 1px solid var(--ab-line-soft);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
  max-width: 70ch;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 54px);
  align-items: start;
}

.page-about .ab-team-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-team-lede {
  margin-top: 16px;
  font-size: 1rem;
  line-height: 1.95;
  max-width: 60ch;
}

.page-about .ab-steps {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .ab-steps .step {
  position: relative;
  padding: 20px 22px 22px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(27, 42, 46, 0.72), rgba(11, 15, 16, 0.36));
}

.page-about .ab-step-idx {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .ab-steps h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.page-about .ab-steps p {
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 品牌口号 ---------- */
.page-about .ab-motto {
  padding: clamp(56px, 8vw, 108px) 0;
  border-top: 1px solid var(--ab-line-soft);
  border-bottom: 1px solid var(--ab-line-soft);
  background: linear-gradient(180deg, transparent, rgba(15, 32, 36, 0.72) 44%, transparent);
}

.page-about .ab-motto-latin {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 6.2vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  margin-top: 14px;
  color: var(--gold-light);
  overflow-wrap: anywhere;
}

@supports (background-clip: text) or (-webkit-background-clip: text) {
  .page-about .ab-motto-latin {
    background: linear-gradient(96deg, var(--gold-light), var(--gold) 46%, var(--ripple-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.page-about .ab-motto-cn {
  margin-top: 14px;
  font-size: clamp(0.98rem, 2vw, 1.22rem);
  letter-spacing: 0.18em;
  color: var(--gold-light);
}

.page-about .ab-motto-body {
  margin-top: clamp(24px, 4vw, 42px);
  max-width: 62ch;
}

.page-about .ab-motto-body p {
  font-size: 1rem;
  line-height: 1.95;
  margin-bottom: 1.3em;
}

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

/* ---------- 资质 ---------- */
.page-about .ab-cred {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 58px);
  align-items: center;
}

.page-about .ab-cred-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .ab-cred-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-md);
  background: rgba(27, 42, 46, 0.46);
}

.page-about .ab-cred-key {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .ab-cred-val {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .ab-cred-note {
  margin-top: clamp(20px, 3vw, 30px);
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .ab-cred-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-cred-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 延伸入口 ---------- */
.page-about .ab-next {
  padding: clamp(48px, 7vw, 96px) 0 clamp(64px, 9vw, 124px);
}

.page-about .ab-next-title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  letter-spacing: -0.02em;
}

.page-about .ab-next-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 34px);
  background: var(--ab-line-soft);
  border-top: 1px solid var(--ab-line-soft);
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-next-list a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 24px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .ab-next-list a:hover,
.page-about .ab-next-list a:focus-visible {
  background: var(--slate);
  color: var(--gold-light);
}

.page-about .ab-next-list strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .ab-next-list span {
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-next-list a:hover span,
.page-about .ab-next-list a:focus-visible span {
  color: var(--mist);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-origin {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(42px, 6vw, 88px);
  }

  .page-about .ab-origin-head {
    position: sticky;
    top: calc(var(--header-h) + 36px);
    align-self: start;
  }

  .page-about .ab-axis {
    left: 50%;
    top: 10px;
    bottom: 10px;
  }

  .page-about .ab-tl {
    gap: clamp(46px, 6vw, 76px);
  }

  .page-about .ab-tl-item {
    width: calc(50% - 52px);
    padding-left: 0;
  }

  .page-about .ab-tl-item:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .ab-tl-item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .ab-tl-item:nth-child(odd) .ab-tl-dot {
    left: auto;
    right: -60px;
  }

  .page-about .ab-tl-item:nth-child(even) .ab-tl-dot {
    left: -60px;
    right: auto;
  }
}

@media (min-width: 940px) {
  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
    gap: clamp(42px, 6vw, 96px);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(48px, 6vw, 92px);
  }

  .page-about .ab-cred {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 760px) {
  .page-about .ab-next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 620px) {
  .page-about .ab-cred-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* 窄屏：时间轴要点默认展开，避免悬停不可用造成信息缺失 */
@media (max-width: 899px) {
  .page-about .ab-tl-detail {
    grid-template-rows: 1fr;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl-detail,
  .page-about .ab-tl-dot,
  .page-about .ab-jump-chip,
  .page-about .ab-next-list a {
    transition: none;
  }
}