.page-about {
  --about-rail-w: 200px;
  --about-stage-line: 2px solid var(--steel);
  color: var(--paper);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  display: grid;
  gap: var(--gap-l);
  padding-block: clamp(36px, 6vw, 80px) clamp(28px, 4vw, 48px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72%;
  max-width: 520px;
  height: 232px;
  background: linear-gradient(118deg, rgba(23, 50, 95, 0.92) 0%, rgba(14, 33, 68, 0.28) 68%, rgba(7, 18, 41, 0) 100%);
  clip-path: polygon(0 0, 100% 0, 72% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__copy,
.page-about .about-hero__figure {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-hero .eyebrow {
  margin-bottom: 12px;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
}

.page-about .about-hero .lead {
  margin: 0;
  max-width: 34em;
}

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
    gap: clamp(32px, 5vw, 64px);
  }
}

/* 首屏数字条 */

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  background: var(--steel);
  border: 2px solid var(--steel);
}

@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-fact {
  background: var(--ink);
  padding: 14px 16px 16px;
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 19px;
  line-height: 1.2;
  color: var(--gold);
  letter-spacing: 0.02em;
}

/* 首屏图 */

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__frame {
  aspect-ratio: 14 / 9;
}

/* ---------- 图片容器 ---------- */

.page-about .media-frame {
  display: block;
  aspect-ratio: 3 / 2;
  background: var(--night);
  border: 2px solid var(--steel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 左侧时间线 + 正文 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  padding-block: clamp(28px, 4vw, 52px) clamp(56px, 8vw, 104px);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 4.5vw, 68px);
    align-items: start;
  }
}

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

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: 36px;
  }
}

.page-about .rail-head {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .rail-head::before {
  content: "";
  display: block;
  width: 30px;
  height: 2px;
  background: var(--gold);
  margin-bottom: 10px;
}

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-item {
  flex: 0 0 auto;
}

.page-about .tl-node {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border: 2px solid var(--steel);
  background: var(--night);
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-visible {
  border-color: var(--gold-dim);
  color: var(--gold);
}

.page-about .tl-dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
}

.page-about .tl-year {
  font-size: 14px;
  color: var(--gold);
}

.page-about .tl-label {
  font-size: 13px;
  color: var(--mist);
}

@media (min-width: 1024px) {
  .page-about .tl-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    position: relative;
  }

  .page-about .tl-list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 16px;
    bottom: 16px;
    width: 2px;
    background: linear-gradient(180deg, var(--gold-dim) 0%, var(--steel) 72%, transparent 100%);
  }

  .page-about .tl-item {
    flex: 0 0 auto;
  }

  .page-about .tl-node {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3px;
    padding: 11px 0 11px 24px;
    border: 0;
    background: transparent;
    white-space: normal;
    position: relative;
  }

  .page-about .tl-node:hover,
  .page-about .tl-node:focus-visible {
    background: transparent;
    border-color: transparent;
    color: var(--gold);
  }

  .page-about .tl-dot {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    border: 2px solid var(--gold-dim);
    background: var(--ink);
    transition: background 180ms var(--ease), border-color 180ms var(--ease);
  }

  .page-about .tl-node:hover .tl-dot,
  .page-about .tl-node:focus-visible .tl-dot {
    background: var(--gold);
    border-color: var(--gold);
  }

  .page-about .tl-year {
    font-size: 17px;
    letter-spacing: 0.04em;
  }

  .page-about .tl-label {
    font-size: 12px;
  }
}

/* ---------- 正文章节 ---------- */

.page-about .about-content {
  display: grid;
  gap: clamp(40px, 6vw, 76px);
  min-width: 0;
}

.page-about .about-stage {
  position: relative;
  padding-left: clamp(16px, 3vw, 28px);
  border-left: var(--about-stage-line);
  scroll-margin-top: 40px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 6px;
  width: 2px;
  height: 30px;
  background: var(--gold);
}

.page-about .stage-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-bottom: 18px;
}

.page-about .stage-mark {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  line-height: 1;
  color: var(--gold);
  border: 1px solid var(--gold-dim);
  padding: 5px 10px 4px;
}

.page-about .stage-title {
  margin: 0;
  color: var(--paper);
}

.page-about .about-prose {
  display: grid;
  gap: 15px;
}

.page-about .about-prose p {
  margin: 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--paper);
  max-width: 38em;
}

.page-about .about-prose a,
.page-about .creed-item a,
.page-about .about-note a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-prose a:hover,
.page-about .creed-item a:hover,
.page-about .about-note a:hover {
  color: var(--paper);
}

.page-about .about-note {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 38em;
}

/* 状态角标 */

.page-about .status-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

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

.page-about .team-card {
  border: 2px solid var(--steel);
  background: var(--night);
  padding: 20px 18px 22px;
  box-shadow: var(--shadow-hard);
}

.page-about .team-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(30px, 5vw, 40px);
  line-height: 1;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.5;
  color: var(--paper);
}

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

/* ---------- 合作 ---------- */

.page-about .prov-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-figure {
  margin: 26px 0 0;
}

/* ---------- 在意的事 ---------- */

.page-about .creed-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  border-top: 2px solid var(--steel);
}

.page-about .creed-item {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 2px solid var(--steel);
}

@media (min-width: 760px) {
  .page-about .creed-item {
    grid-template-columns: minmax(180px, 0.42fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}

.page-about .creed-item h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.5;
  color: var(--gold);
}

.page-about .creed-item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  max-width: 36em;
}

/* ---------- 收束 ---------- */

.page-about .about-next {
  display: grid;
  gap: 14px;
  padding: clamp(24px, 4vw, 40px);
  background: linear-gradient(135deg, rgba(23, 50, 95, 0.92) 0%, rgba(7, 18, 41, 0.96) 100%);
  border: 2px solid var(--steel);
  border-top: 4px solid var(--cinnabar);
}

.page-about .about-next h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  color: var(--paper);
}

.page-about .about-next p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 32em;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* ---------- 入场 ---------- */

.page-about .reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}