.page-about{
  --about-rail:210px;
  --about-measure:68ch;
  padding-bottom:clamp(48px,8vw,96px);
}

.page-about .breadcrumb{
  margin-top:24px;
}

/* ---------- 页头 ---------- */
.page-about .about-hero{
  display:grid;
  gap:var(--gap);
  margin-top:16px;
  padding-bottom:clamp(32px,5vw,56px);
  border-bottom:1px solid var(--line);
}
.page-about .about-hero-copy{
  min-width:0;
}
.page-about .hero-eyebrow{
  margin:0 0 12px;
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--text-faint);
}
.page-about .about-title{
  margin:0 0 16px;
  font-family:var(--font-head);
  font-size:clamp(30px,5.4vw,56px);
  line-height:1.08;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--text);
}
.page-about .about-lede{
  margin:0 0 26px;
  max-width:46ch;
  font-size:clamp(15px,1.4vw,17px);
  line-height:1.8;
  color:var(--text-dim);
}
.page-about .hero-stats{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:var(--gap-s);
  padding-top:16px;
  border-top:1px solid var(--line-soft);
  margin-bottom:26px;
}
.page-about .hero-stat{
  display:flex;
  flex-direction:column;
  gap:4px;
  min-width:0;
}
.page-about .hero-stat .stat-num{
  font-family:var(--font-mono);
  font-size:clamp(20px,2.6vw,30px);
  font-weight:600;
  line-height:1;
  letter-spacing:.04em;
  color:var(--cyan);
}
.page-about .hero-stat .stat-num--gold{
  color:var(--gold);
}
.page-about .hero-stat .stat-label{
  font-size:12px;
  line-height:1.5;
  color:var(--text-faint);
}
.page-about .hero-actions{
  gap:12px;
  flex-wrap:wrap;
}
.page-about .about-hero-media{
  margin:0;
  min-width:0;
}
.page-about .about-hero-media img{
  display:block;
  width:100%;
  height:100%;
  aspect-ratio:16/9;
  object-fit:cover;
}

/* ---------- 左侧索引 + 正文骨架 ---------- */
.page-about .about-shell{
  display:grid;
  gap:clamp(20px,3vw,32px);
  padding-top:clamp(28px,4vw,48px);
}
.page-about .about-rail{
  min-width:0;
  padding-bottom:16px;
  border-bottom:1px solid var(--line-soft);
}
.page-about .rail-title{
  margin:0 0 12px;
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--text-faint);
}
.page-about .rail-list{
  display:flex;
  gap:8px;
  margin:0;
  padding:0 0 4px;
  list-style:none;
  overflow-x:auto;
  scrollbar-width:none;
}
.page-about .rail-list::-webkit-scrollbar{
  display:none;
}
.page-about .rail-link{
  display:flex;
  align-items:baseline;
  gap:9px;
  padding:8px 11px;
  border:1px solid transparent;
  border-radius:8px;
  font-size:13px;
  white-space:nowrap;
  text-decoration:none;
  color:var(--text-dim);
  transition:color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease);
}
.page-about .rail-link:hover,
.page-about .rail-link:focus-visible{
  color:var(--text);
  border-color:var(--violet);
  background:var(--violet-dim);
}
.page-about .rail-num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--violet);
}
.page-about .about-body{
  min-width:0;
}

/* ---------- 章节 ---------- */
.page-about .chapter{
  padding:clamp(30px,5vw,56px) 0;
  border-top:1px solid var(--line-soft);
  scroll-margin-top:calc(var(--header-h) + 24px);
}
.page-about .chapter:first-child{
  padding-top:0;
  border-top:0;
}
.page-about .chapter-head{
  margin-bottom:clamp(16px,2.5vw,24px);
}
.page-about .section-index{
  display:block;
  margin-bottom:8px;
  font-family:var(--font-mono);
  font-size:clamp(16px,2vw,22px);
  line-height:1;
  letter-spacing:.12em;
  color:var(--violet);
}
.page-about .chapter .section-title{
  margin:0;
  max-width:26ch;
  font-family:var(--font-head);
  font-size:clamp(22px,3vw,34px);
  line-height:1.22;
  font-weight:700;
  color:var(--text);
}
.page-about .chapter-body{
  max-width:var(--about-measure);
}
.page-about .chapter-body p{
  margin:0 0 18px;
  font-size:16px;
  line-height:1.85;
  color:var(--text);
}
.page-about .chapter-body p:last-child{
  margin-bottom:0;
}
.page-about .chapter-quote{
  max-width:var(--about-measure);
  margin:24px 0;
  padding:16px 20px;
  border-left:2px solid var(--violet);
  border-radius:0 var(--radius) var(--radius) 0;
  background:rgba(124,77,255,.04);
  font-size:15px;
  line-height:1.8;
  color:var(--text);
}
.page-about .chapter-body .chapter-quote{
  margin-bottom:0;
}

/* ---------- 章节内图文 ---------- */
.page-about .chapter-figure{
  margin:clamp(20px,3vw,32px) 0;
  min-width:0;
}
.page-about .chapter-figure img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .chapter-side{
  margin:0;
  min-width:0;
}
.page-about .chapter-side img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .iter-svg{
  display:block;
  width:100%;
  max-width:720px;
  height:auto;
  margin:clamp(24px,4vw,40px) 0;
  opacity:.92;
}

/* ---------- 团队分组 ---------- */
.page-about .team-layout{
  display:grid;
  gap:var(--gap);
  margin-top:clamp(18px,2.6vw,26px);
}
.page-about .team-cards{
  display:grid;
  gap:var(--gap-s);
  min-width:0;
}
.page-about .team-item{
  display:grid;
  grid-template-columns:40px minmax(0,1fr);
  gap:14px;
  padding:18px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--ink-800);
  box-shadow:var(--shadow-plate);
  transition:border-color var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);
}
.page-about .team-item:hover{
  border-color:var(--violet);
  transform:translateY(-2px);
}
.page-about .team-num{
  padding-top:3px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--violet);
}
.page-about .team-item h3{
  margin:0 0 6px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
}
.page-about .team-item p{
  margin:0;
  font-size:14px;
  line-height:1.75;
  color:var(--text-dim);
}

/* ---------- 覆盖范围数据 ---------- */
.page-about .about-data{
  max-width:640px;
  margin:clamp(20px,3vw,28px) 0 0;
}
.page-about .about-data .data-value{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  color:var(--cyan);
}

/* ---------- 更新节奏 ---------- */
.page-about .stage-list{
  max-width:660px;
  margin:clamp(20px,3vw,28px) 0 0;
  padding:0;
  list-style:none;
}
.page-about .stage-item{
  display:grid;
  grid-template-columns:104px minmax(0,1fr);
  gap:16px;
  align-items:baseline;
  padding:14px 0;
  border-top:1px solid var(--line-soft);
}
.page-about .stage-item:last-child{
  border-bottom:1px solid var(--line-soft);
}
.page-about .stage-when{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--violet);
}
.page-about .stage-what{
  margin:0;
  font-size:14px;
  line-height:1.75;
  color:var(--text-dim);
}

/* ---------- 下一步入口 ---------- */
.page-about .next-grid{
  display:grid;
  gap:var(--gap-s);
  margin-top:clamp(20px,3vw,28px);
}
.page-about .next-card{
  display:flex;
  flex-direction:column;
  gap:8px;
  min-width:0;
  text-decoration:none;
  transition:border-color var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);
}
.page-about .next-card:hover,
.page-about .next-card:focus-visible{
  border-color:var(--violet);
  transform:translateY(-2px);
}
.page-about .next-card .card-index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--violet);
}
.page-about .next-card .card-title{
  margin:0;
  font-size:17px;
  font-weight:600;
  color:var(--text);
}
.page-about .next-card .card-text{
  margin:0;
  flex:1;
  font-size:14px;
  line-height:1.75;
  color:var(--text-dim);
}
.page-about .next-card .card-link{
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--gold);
}

/* ---------- 回到顶部 ---------- */
.page-about .to-top{
  display:inline-flex;
  align-items:center;
  margin-top:clamp(32px,5vw,52px);
  padding:8px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  text-decoration:none;
  color:var(--text-dim);
  transition:color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease);
}
.page-about .to-top:hover,
.page-about .to-top:focus-visible{
  color:var(--text);
  border-color:var(--violet);
}

/* ---------- 平板 ---------- */
@media (min-width:760px){
  .page-about .next-grid{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
  .page-about .team-cards{
    gap:var(--gap);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width:960px){
  .page-about .about-hero{
    grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);
    align-items:end;
    gap:clamp(24px,4vw,56px);
  }
  .page-about .team-layout{
    grid-template-columns:minmax(0,1fr) minmax(0,.66fr);
    align-items:start;
  }
}

@media (min-width:1080px){
  .page-about .about-shell{
    grid-template-columns:var(--about-rail) minmax(0,1fr);
    gap:clamp(32px,5vw,72px);
    align-items:start;
  }
  .page-about .about-rail{
    position:sticky;
    top:calc(var(--header-h) + 28px);
    padding:4px 0 4px 16px;
    border-bottom:0;
    border-left:1px solid var(--line-soft);
  }
  .page-about .rail-list{
    flex-direction:column;
    gap:2px;
    overflow:visible;
    padding-bottom:0;
  }
  .page-about .rail-link{
    white-space:normal;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width:520px){
  .page-about .hero-stats{
    grid-template-columns:1fr;
    gap:12px;
  }
  .page-about .hero-stat{
    flex-direction:row;
    align-items:baseline;
    gap:10px;
  }
  .page-about .stage-item{
    grid-template-columns:1fr;
    gap:4px;
  }
  .page-about .team-item{
    grid-template-columns:32px minmax(0,1fr);
    gap:10px;
    padding:16px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  .page-about .team-item,
  .page-about .next-card,
  .page-about .rail-link,
  .page-about .to-top{
    transition:none;
  }
  .page-about .team-item:hover,
  .page-about .next-card:hover{
    transform:none;
  }
}
</style>