.page-about{
  --about-rail: 76px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  padding: 100px 0 0;
  overflow-x: hidden;
}

.page-about .crumb{
  font-size: var(--fs-sm);
  color: var(--grey);
  padding: 2px 0 18px;
}
.page-about .crumb a{
  color: var(--grey);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}
.page-about .crumb a:hover{ color: var(--gold); border-bottom-color: var(--gold); }
.page-about .crumb-sep{ margin: 0 8px; color: var(--line); }
.page-about .crumb [aria-current="page"]{ color: var(--paper); }

/* ---------- 首屏题签 ---------- */
.page-about .about-hero{
  position: relative;
  margin: 0 auto 10px;
  padding: 26px 18px 30px;
  background:
    repeating-linear-gradient(90deg, rgba(30,58,82,.55) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(180deg, rgba(30,58,82,.55) 0 1px, transparent 1px 72px),
    linear-gradient(158deg, #0E2438 0%, #0B1B2B 64%);
}
.page-about .about-hero .eyebrow{
  color: var(--gold);
  letter-spacing: .18em;
  font-size: var(--fs-label);
  margin: 0 0 10px;
}
.page-about .about-title{
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 20ch;
}
.page-about .about-lede{
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: var(--fs-md);
  line-height: 1.78;
  color: var(--paper);
}
.page-about .about-lede--sub{
  margin-top: 12px;
  color: var(--grey);
}
.page-about .about-lede a,
.page-about .about-note a,
.page-about .chapter-copy a,
.page-about .check-list a{
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(224,163,62,.45);
}
.page-about .about-lede a:hover,
.page-about .about-note a:hover,
.page-about .chapter-copy a:hover,
.page-about .check-list a:hover{
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .about-stats{
  list-style: none;
  margin: 26px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-stats li{
  background: var(--panel);
  padding: 14px 12px 16px;
}
.page-about .stat-value{ display: block; }
.page-about .stat-num{
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}
.page-about .stat-unit{
  font-size: var(--fs-sm);
  color: var(--paper);
  margin-left: 5px;
}
.page-about .stat-label{
  display: block;
  margin-top: 9px;
  font-size: var(--fs-label);
  letter-spacing: .12em;
  color: var(--grey);
}
.page-about .about-note{
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 章节骨架 ---------- */
.page-about .section{ padding: 46px 0 50px; }
.page-about .chapter{ border-top: 1px solid var(--line); }
.page-about .chapter-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 20px;
}
.page-about .chapter-rail{
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.page-about .chapter-num{
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0;
}
.page-about .chapter-tag{
  font-family: var(--font-head);
  font-size: var(--fs-label);
  letter-spacing: .18em;
  color: var(--grey);
}
.page-about .chapter-copy h2{
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 16px 0 0;
}
.page-about .chapter-lede{
  font-size: var(--fs-md);
  line-height: 1.78;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 64ch;
}
.page-about .chapter-copy h3{
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  margin: 0 0 6px;
  color: var(--paper);
}

/* 对照表 */
.page-about .data-list{
  margin: 22px 0 0;
  border-top: 1px solid var(--line);
}
.page-about .data-row{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .data-row dt{
  color: var(--gold);
  font-size: var(--fs-sm);
  letter-spacing: .04em;
}
.page-about .data-row dd{
  margin: 0;
  color: var(--grey);
  font-size: var(--fs-sm);
  line-height: 1.75;
}

/* 图片框 */
.page-about .media-frame{
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-about .media-frame img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--line);
}
.page-about .media-frame--tall img{ aspect-ratio: 4 / 5; }
.page-about .media-frame--wide img{ aspect-ratio: 16 / 9; }
.page-about .media-cap{
  margin: 10px 0 0;
  font-size: var(--fs-label);
  letter-spacing: .1em;
  color: var(--grey);
}

/* ---------- 分区示意 ---------- */
.page-about .floorplan{
  margin: 24px 0 0;
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.page-about .plan-caption{
  margin: 0 0 10px;
  font-size: var(--fs-label);
  letter-spacing: .14em;
  color: var(--grey);
}
.page-about .plan-band{
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}
.page-about .plan-band:last-child{ border-bottom: 0; }
.page-about .plan-label{
  display: block;
  font-family: var(--font-head);
  font-size: var(--fs-label);
  letter-spacing: .14em;
  color: var(--grey);
  margin-bottom: 8px;
}
.page-about .plan-cells{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14px, 1fr));
  gap: 4px;
}
.page-about .plan-cells span{
  display: block;
  height: 16px;
  background: var(--line);
}
.page-about .plan-band--small .plan-cells span{ background: var(--celadon); opacity: .55; }
.page-about .plan-band--mid .plan-cells span{ background: var(--gold); opacity: .55; }
.page-about .plan-band--large .plan-cells span{ background: var(--cinnabar); opacity: .6; }

/* ---------- 时间轴 ---------- */
.page-about .timeline{
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 0 24px;
  position: relative;
}
.page-about .timeline::before{
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 8px;
  width: 1px;
  background: var(--line);
}
.page-about .timeline-item{
  position: relative;
  padding: 0 0 24px;
}
.page-about .timeline-item:last-child{ padding-bottom: 4px; }
.page-about .timeline-item::before{
  content: "";
  position: absolute;
  left: -23px;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--gold);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .timeline-item:hover::before,
.page-about .timeline-item:focus-within::before{
  background: var(--gold);
  transform: scale(1.18);
}
.page-about .tl-year{
  display: block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--cinnabar);
  letter-spacing: 0;
}
.page-about .tl-body{ margin-top: 6px; }
.page-about .tl-note{
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--grey);
  max-width: 60ch;
}
.page-about .history-photo{ margin-top: 28px; }

/* ---------- 档案双卡 ---------- */
.page-about .archive-pair{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 14px;
  margin: 24px 0 0;
}
.page-about .archive-card{
  padding: 18px 16px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
}
.page-about .archive-card--q{ border-left-color: var(--celadon); }
.page-about .archive-num{
  display: block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 46px;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.01em;
}
.page-about .archive-card--q .archive-num{ color: var(--celadon); }
.page-about .archive-card h3{ margin: 12px 0 8px; }
.page-about .archive-card p{
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--grey);
}
.page-about .archive-meta{
  margin-top: 12px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: var(--fs-label) !important;
  letter-spacing: .1em;
}

/* ---------- 包场与合作 ---------- */
.page-about .chapter--coop{
  border-top-color: var(--gold);
  background: linear-gradient(180deg, #13293D 0%, #0B1B2B 100%);
}
.page-about .scene-list{
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .scene-list li{
  background: var(--ink);
  padding: 14px;
}
.page-about .scene-list p{
  margin: 8px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--grey);
}
.page-about .cta-row{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 到访之前 ---------- */
.page-about .check-list{
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .check-list li{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .check-key{
  font-family: var(--font-head);
  font-size: var(--fs-label);
  letter-spacing: .18em;
  color: var(--celadon);
}
.page-about .check-list p{
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--grey);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px){
  .page-about .data-row{
    grid-template-columns: 190px minmax(0,1fr);
    gap: 18px;
    align-items: baseline;
  }
  .page-about .check-list li{
    grid-template-columns: 110px minmax(0,1fr);
    gap: 18px;
    align-items: baseline;
  }
  .page-about .about-hero{ padding: 34px 30px 38px; }
}

@media (min-width: 760px){
  .page-about .about-stats{ grid-template-columns: repeat(4, minmax(0,1fr)); }
  .page-about .stat-num{ font-size: 34px; }
  .page-about .archive-pair{ grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-about .scene-list{ grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-about .section{ padding: 58px 0 62px; }
}

@media (min-width: 880px){
  .page-about{ padding-top: 118px; }
  .page-about .chapter-grid{
    grid-template-columns: var(--about-rail) minmax(0,1fr);
    gap: 30px 40px;
    align-items: start;
  }
  .page-about .chapter-grid--split{
    grid-template-columns: var(--about-rail) minmax(0,1.05fr) minmax(0,.9fr);
  }
  .page-about .chapter-rail{
    position: sticky;
    top: 108px;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-bottom: 0;
    border-bottom: 0;
  }
  .page-about .chapter-num{ font-size: 44px; }
  .page-about .chapter-tag{
    writing-mode: vertical-rl;
    letter-spacing: .22em;
  }
  .page-about .chapter-copy h2{ margin-top: 0; }
  .page-about .chapter-visual{ padding-top: 4px; }
  .page-about .history-photo{ margin-top: 34px; margin-left: calc(var(--about-rail) + 40px); }
  .page-about .archive-num{ font-size: 56px; }
}

@media (prefers-reduced-motion: reduce){
  .page-about .timeline-item::before{ transition: none; }
}