.page-about {
  background: var(--c-ink);
  color: var(--c-paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--gutter) * 2.4) 0 0;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 82% 8%, rgba(44, 224, 214, .16), transparent 44%),
    radial-gradient(circle at 8% 72%, rgba(122, 36, 56, .26), transparent 52%),
    radial-gradient(circle at 46% 118%, rgba(217, 164, 65, .10), transparent 46%),
    linear-gradient(184deg, var(--c-ink-deep) 0%, var(--c-ink) 46%, var(--c-violet) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
  background-image:
    radial-gradient(1px 1px at 12% 24%, rgba(244, 241, 232, .55), transparent 100%),
    radial-gradient(1px 1px at 34% 64%, rgba(44, 224, 214, .5), transparent 100%),
    radial-gradient(1px 1px at 58% 18%, rgba(244, 241, 232, .4), transparent 100%),
    radial-gradient(1px 1px at 76% 52%, rgba(217, 164, 65, .55), transparent 100%),
    radial-gradient(1px 1px at 91% 30%, rgba(244, 241, 232, .45), transparent 100%),
    radial-gradient(1px 1px at 22% 88%, rgba(44, 224, 214, .35), transparent 100%);
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 52px);
}

.page-about .about-hero__title {
  max-width: 18ch;
  margin: 12px 0 0;
  font-size: clamp(38px, 8.4vw, 92px);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--c-paper);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin-top: clamp(20px, 3vw, 32px);
  color: var(--c-slate);
}

.page-about .about-hero__figure {
  position: relative;
  margin: clamp(34px, 6vw, 64px) 0 0;
  border: 1px solid var(--line-2);
  background: var(--c-ink-deep);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(8, 18, 38, .10) 0%, rgba(27, 16, 53, .62) 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

/* ---------- 首屏数据条 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-1);
  border: 1px solid var(--line-2);
  border-top: 0;
}

.page-about .about-fact {
  background: rgba(8, 18, 38, .9);
  padding: 18px 18px 20px;
}

.page-about .about-fact dd {
  margin: 6px 0 0;
}

.page-about .about-fact .num {
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -.01em;
}

.page-about .about-fact .board-label {
  color: var(--c-slate);
}

/* ---------- 正文区 ---------- */
.page-about .about-body {
  position: relative;
  padding-top: clamp(48px, 8vw, 104px);
  padding-bottom: clamp(56px, 9vw, 128px);
}

.page-about .about-body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(46%, 520px);
  height: 1px;
  background: linear-gradient(90deg, var(--c-gold), transparent);
}

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

.page-about .about-section {
  position: relative;
  padding: clamp(40px, 7vw, 88px) 0;
  border-top: 1px solid var(--line-1);
}

.page-about .about-sections > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__lede {
  max-width: 60ch;
  margin-top: clamp(14px, 2vw, 22px);
  color: var(--c-slate);
}

.page-about .about-section .h2 {
  margin-top: 10px;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -.01em;
}

.page-about .about-section .prose p + p {
  margin-top: 1.1em;
}

.page-about .origin-note {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-gold) 0%, rgba(217, 164, 65, .22) 62%, transparent 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(30px, 4.6vw, 46px) 34px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--c-ink);
  border: 1px solid var(--c-gold);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--c-gold);
}

.page-about .tl-year {
  display: block;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 8px;
}

.page-about .tl-item .h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.6vw, 22px);
  color: var(--c-paper);
}

.page-about .tl-item p {
  margin: 0;
  max-width: 58ch;
  color: var(--c-slate);
  line-height: 1.75;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(28px, 4.4vw, 44px);
  background: var(--line-1);
  border: 1px solid var(--line-2);
}

.page-about .team-card {
  position: relative;
  background: rgba(42, 27, 77, .42);
  padding: clamp(20px, 3vw, 28px);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team-card:hover {
  background: rgba(42, 27, 77, .66);
  transform: translateY(-2px);
}

.page-about .team-card__no {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-orange);
}

.page-about .team-card .h3 {
  margin: 10px 0 0;
  font-size: clamp(18px, 2.6vw, 21px);
}

.page-about .team-card__num {
  margin: 8px 0 12px;
  display: flex;
  align-items: baseline;
  gap: 6px;
  color: var(--c-slate);
  font-size: 13px;
  letter-spacing: .06em;
}

.page-about .team-card__num .num {
  font-size: clamp(30px, 5vw, 40px);
  line-height: 1;
  color: var(--c-gold);
}

.page-about .team-card p:last-child {
  margin: 0;
  color: var(--c-slate);
  line-height: 1.75;
}

.page-about .about-team-figure {
  margin: clamp(30px, 5vw, 48px) 0 0;
  border: 1px solid var(--line-2);
  background: var(--c-ink-deep);
}

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

/* ---------- 服务区域 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .coverage-figure {
  margin: 0;
  border: 1px solid var(--line-2);
  background:
    radial-gradient(circle at 30% 30%, rgba(44, 224, 214, .10), transparent 60%),
    var(--c-ink-deep);
}

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

.page-about .coverage-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4.4vw, 44px) 0 0;
  padding: 0;
  background: var(--line-1);
  border: 1px solid var(--line-2);
}

.page-about .coverage-stats li {
  background: rgba(8, 18, 38, .88);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .coverage-stats .num {
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .coverage-stats .board-label {
  color: var(--c-slate);
}

/* ---------- 更新节奏 ---------- */
.page-about .rhythm-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4.4vw, 44px);
  background: var(--line-1);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}

.page-about .rhythm-item {
  background: linear-gradient(180deg, rgba(27, 16, 53, .72), rgba(8, 18, 38, .72));
  padding: 20px 18px;
}

.page-about .rhythm-item .num {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1;
  color: var(--c-orange);
}

.page-about .rhythm-unit {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-slate);
  margin-left: 6px;
}

.page-about .rhythm-item .board-label {
  margin: 10px 0 0;
  color: var(--c-slate);
}

/* ---------- 收尾 ---------- */
.page-about .about-section--next {
  padding-bottom: 0;
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .next-links {
  list-style: none;
  margin: clamp(30px, 4.6vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-1);
  border-top: 1px solid var(--line-2);
}

.page-about .next-links li {
  background: rgba(8, 18, 38, .7);
  padding: 16px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}

.page-about .next-links a {
  font-weight: 700;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 224, 214, .38);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .next-links a:hover {
  color: var(--c-paper);
  border-color: var(--c-gold);
}

.page-about .next-links .muted {
  font-size: 14px;
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 959px) {
  .page-about .rail {
    display: none;
  }

  .page-about .rail-layout {
    display: block;
  }
}

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

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

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

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

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

  .page-about .next-links li {
    padding-right: 18px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: clamp(72px, 8vw, 124px);
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: center;
  }

  .page-about .about-hero__figure {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 46px));
  }

  .page-about .about-section {
    padding-left: clamp(0px, 1.6vw, 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .tl-item::before,
  .page-about .next-links a {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}