.page-about{
  --pa-bg:#0B1626;
  --pa-bg-deep:#060C14;
  --pa-line:rgba(170,182,196,.18);
  --pa-line-strong:rgba(170,182,196,.32);
  --pa-card:rgba(17,42,69,.62);
  --pa-card-soft:rgba(6,12,20,.5);
  --pa-gold:var(--gold);
  --pa-muted:var(--silver);
  background:
    radial-gradient(1100px 640px at 88% -8%, rgba(230,169,60,.16), transparent 60%),
    radial-gradient(880px 600px at -12% 26%, rgba(111,168,160,.13), transparent 62%),
    linear-gradient(180deg, var(--pa-bg) 0%, var(--pa-bg-deep) 100%);
  color:var(--ivory);
  font-family:var(--font-body);
  overflow-x:hidden;
  padding-bottom:72px;
}

.page-about .section{padding:56px 0;}
.page-about .section--tight{padding:34px 0;}

.page-about .eyebrow{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.14em;
  color:var(--pa-gold);
  text-transform:none;
  margin:0 0 12px;
}

.page-about .section-title{
  font-family:var(--font-display);
  font-size:clamp(1.55rem, 4.6vw, 2.5rem);
  line-height:1.16;
  letter-spacing:-.02em;
  color:var(--ivory);
  margin:0;
}

.page-about .section-head{
  display:grid;
  gap:16px;
  margin-bottom:32px;
}
.page-about .section-head__note{
  margin:0;
  color:var(--pa-muted);
  font-size:1rem;
  line-height:1.75;
  max-width:56ch;
}

.page-about .serif-lede{
  font-family:var(--font-serif);
  font-size:1.08rem;
  line-height:1.85;
  color:var(--ivory);
  margin:20px 0 0;
}
.page-about .lede{
  font-size:1rem;
  line-height:1.85;
  color:var(--pa-muted);
  margin:18px 0 0;
}

.page-about .prose p{
  margin:0 0 16px;
  font-size:1rem;
  line-height:1.85;
  color:var(--pa-muted);
}
.page-about .prose p:last-child{margin-bottom:0;}

.page-about .breadcrumbs{margin-top:18px;}
.page-about .breadcrumbs ol{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.08em;
  color:var(--pa-muted);
}
.page-about .breadcrumbs li:not(:last-child)::after{
  content:"/";
  margin-left:8px;
  color:var(--pa-line-strong);
}
.page-about .breadcrumbs a{
  color:var(--pa-muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible{
  color:var(--pa-gold);
  border-bottom-color:var(--pa-gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__grid{
  display:grid;
  gap:28px;
}
.page-about .about-hero h1{
  font-family:var(--font-display);
  font-size:clamp(2rem, 8vw, 3.6rem);
  line-height:1.06;
  letter-spacing:-.03em;
  color:var(--ivory);
  margin:0;
}

.page-about .about-hero__viz{
  position:relative;
  width:min(100%, 360px);
  aspect-ratio:1 / 1;
  margin:8px auto 0;
  border-radius:50%;
  background:radial-gradient(circle at 50% 46%, rgba(230,169,60,.22), transparent 64%);
}
.page-about .viz-ring{
  position:absolute;
  left:50%;
  top:50%;
  border:1px solid rgba(230,169,60,.34);
  border-radius:18%;
}
.page-about .viz-ring--a{
  width:78%;
  height:78%;
  transform:translate(-50%,-50%) rotate(45deg);
}
.page-about .viz-ring--b{
  width:56%;
  height:56%;
  transform:translate(-50%,-50%) rotate(45deg);
  border-color:rgba(111,168,160,.45);
}
.page-about .viz-ring--c{
  width:34%;
  height:34%;
  transform:translate(-50%,-50%) rotate(45deg);
  border-color:rgba(200,70,58,.5);
}
.page-about .viz-core{
  position:absolute;
  left:50%;
  top:50%;
  width:15%;
  height:15%;
  transform:translate(-50%,-50%) rotate(45deg);
  border-radius:14%;
  background:linear-gradient(135deg, var(--gold), var(--cinnabar));
  box-shadow:0 0 42px rgba(230,169,60,.6);
}
.page-about .viz-horizon{
  position:absolute;
  left:8%;
  right:8%;
  bottom:12%;
  height:13%;
  border-radius:50% 50% 0 0 / 100% 100% 0 0;
  background:linear-gradient(180deg, rgba(111,168,160,.38), rgba(111,168,160,0));
}

.page-about .about-figures{
  list-style:none;
  margin:28px 0 0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:10px;
}
.page-about .about-figures .readout{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:14px 16px;
  border:1px solid var(--pa-line);
  border-radius:var(--radius-md);
  background:var(--pa-card-soft);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--pa-muted);
}
.page-about .about-figures .readout strong{
  font-family:var(--font-display);
  font-size:1.5rem;
  letter-spacing:-.02em;
  color:var(--pa-gold);
  line-height:1;
}

/* ---------- 使命 ---------- */
.page-about .about-mission__grid{
  display:grid;
  gap:32px;
}
.page-about .about-mission__lead .prose{margin-top:18px;}

.page-about .about-mission__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .mission-pill{
  position:relative;
  padding:20px 20px 20px 22px;
  border:1px solid var(--pa-line);
  border-left:3px solid var(--gold);
  border-radius:var(--radius-lg);
  background:linear-gradient(135deg, rgba(17,42,69,.7), rgba(6,12,20,.55));
  transition:transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.page-about .mission-pill__num{
  display:block;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--pa-gold);
  margin-bottom:8px;
}
.page-about .mission-pill h3{
  font-family:var(--font-display);
  font-size:1.05rem;
  letter-spacing:-.01em;
  color:var(--ivory);
  margin:0 0 8px;
}
.page-about .mission-pill p{
  margin:0;
  font-size:.95rem;
  line-height:1.75;
  color:var(--pa-muted);
}

/* ---------- 版本演进 ---------- */
.page-about .about-timeline__grid{
  display:grid;
  gap:32px;
}
.page-about .timeline{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
  display:grid;
  gap:20px;
}
.page-about .timeline::before{
  content:"";
  position:absolute;
  left:16px;
  top:10px;
  bottom:10px;
  width:1px;
  background:linear-gradient(180deg, var(--gold), rgba(230,169,60,.06));
}
.page-about .timeline__item{
  position:relative;
  padding:18px 18px 18px 46px;
  border:1px solid var(--pa-line);
  border-radius:var(--radius-lg);
  background:var(--pa-card-soft);
  transition:transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.page-about .timeline__item::before{
  content:"";
  position:absolute;
  left:10px;
  top:26px;
  width:13px;
  height:13px;
  transform:rotate(45deg);
  background:var(--gold);
  box-shadow:0 0 0 4px rgba(6,12,20,.9), 0 0 18px rgba(230,169,60,.5);
}
.page-about .timeline__tag{
  display:inline-flex;
  align-items:center;
  padding:3px 11px;
  border:1px solid rgba(230,169,60,.42);
  border-radius:var(--radius-pill);
  background:rgba(230,169,60,.1);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--pa-gold);
}
.page-about .timeline__title{
  font-family:var(--font-display);
  font-size:1.05rem;
  letter-spacing:-.01em;
  color:var(--ivory);
  margin:12px 0 8px;
}
.page-about .timeline__text{
  margin:0;
  font-size:.95rem;
  line-height:1.78;
  color:var(--ivory);
}
.page-about .timeline__more{
  margin:10px 0 0;
  padding-left:12px;
  border-left:2px solid rgba(111,168,160,.45);
  font-size:.9rem;
  line-height:1.72;
  color:var(--pa-muted);
  opacity:.85;
  transition:opacity .3s var(--ease), border-color .3s var(--ease);
}
.page-about .timeline__item:hover,
.page-about .timeline__item:focus-within{
  transform:translateY(-3px);
  border-color:rgba(230,169,60,.42);
  box-shadow:var(--shadow-lift);
}
.page-about .timeline__item:hover .timeline__more,
.page-about .timeline__item:focus-within .timeline__more{
  opacity:1;
  border-left-color:var(--gold);
}

.page-about .about-timeline__figure{margin:0;}
.page-about .about-timeline__figure img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .media-frame__caption{
  font-size:.85rem;
  line-height:1.7;
  color:var(--pa-muted);
}

/* ---------- 栏目分类 ---------- */
.page-about .about-cat__grid{
  display:grid;
  gap:28px;
}
.page-about .cat-tree{
  display:grid;
  gap:10px;
}
.page-about .cat-node{
  border:1px solid var(--pa-line);
  border-radius:var(--radius-lg);
  background:var(--pa-card-soft);
  overflow:hidden;
  transition:border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.page-about .cat-node__head{margin:0;}
.page-about .cat-node__trigger{
  width:100%;
  display:flex;
  align-items:center;
  gap:12px;
  padding:16px 18px;
  border:0;
  background:transparent;
  cursor:pointer;
  text-align:left;
  color:var(--ivory);
  font-family:var(--font-body);
  font-size:1rem;
  transition:background .3s var(--ease);
}
.page-about .cat-node__num{
  font-family:var(--font-mono);
  font-size:.8rem;
  letter-spacing:.1em;
  color:var(--pa-gold);
}
.page-about .cat-node__name{
  font-family:var(--font-display);
  font-size:1rem;
  letter-spacing:-.01em;
}
.page-about .cat-node__count{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.06em;
  color:var(--pa-muted);
  white-space:nowrap;
}
.page-about .cat-node__chev{
  flex:none;
  width:9px;
  height:9px;
  margin-left:6px;
  border-right:2px solid var(--gold);
  border-bottom:2px solid var(--gold);
  transform:rotate(45deg);
  transition:transform .3s var(--ease);
}
.page-about .cat-node__trigger[aria-expanded="true"] .cat-node__chev{
  transform:rotate(-135deg);
}
.page-about .cat-node__trigger:hover,
.page-about .cat-node__trigger:focus-visible{
  background:rgba(230,169,60,.08);
}
.page-about .cat-node__panel{
  padding:0 18px 18px 44px;
  border-top:1px solid var(--pa-line);
}
.page-about .cat-node__list{
  list-style:none;
  margin:0;
  padding:14px 0 0;
  display:grid;
  gap:10px;
}
.page-about .cat-node__list li{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-size:.95rem;
  line-height:1.6;
  color:var(--ivory);
}
.page-about .cat-node__code{
  flex:none;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--mist);
}

.page-about .about-cat__figure{margin:0;}
.page-about .about-cat__figure img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}

/* ---------- 日常节奏 ---------- */
.page-about .about-board{
  border-radius:var(--radius-xl);
  background:linear-gradient(135deg, rgba(17,42,69,.78), rgba(6,12,20,.7));
  border:1px solid var(--pa-line);
}
.page-about .about-board .board__label{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--pa-gold);
  margin:0 0 12px;
}
.page-about .about-board .board__summary{
  font-family:var(--font-serif);
  font-size:1.05rem;
  line-height:1.9;
  color:var(--ivory);
  margin:0;
}
.page-about .about-board .board__side h3{
  font-family:var(--font-display);
  font-size:.95rem;
  letter-spacing:0;
  color:var(--ivory);
  margin:0 0 12px;
}
.page-about .about-board .board__evidence ul{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:9px;
}
.page-about .about-board .board__evidence li{
  position:relative;
  padding-left:16px;
  font-size:.92rem;
  line-height:1.7;
  color:var(--pa-muted);
}
.page-about .about-board .board__evidence li::before{
  content:"";
  position:absolute;
  left:0;
  top:.62em;
  width:7px;
  height:7px;
  transform:rotate(45deg);
  background:var(--mist);
}
.page-about .about-board .board__terms dl{
  margin:0;
  display:grid;
  gap:12px;
}
.page-about .about-board .board__terms dt{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.06em;
  color:var(--pa-gold);
  margin-bottom:4px;
}
.page-about .about-board .board__terms dd{
  margin:0;
  font-size:.92rem;
  line-height:1.7;
  color:var(--pa-muted);
}
.page-about .about-board .board__more ul{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:10px;
}
.page-about .about-board .board__more a{
  color:var(--ivory);
  text-decoration:none;
  font-size:.92rem;
  line-height:1.7;
  border-bottom:1px solid rgba(230,169,60,.4);
  transition:color .25s var(--ease), border-color .25s var(--ease);
}
.page-about .about-board .board__more a:hover,
.page-about .about-board .board__more a:focus-visible{
  color:var(--pa-gold);
  border-bottom-color:var(--gold);
}

/* ---------- 覆盖与场景 ---------- */
.page-about .about-reach__figure{
  margin:0 0 28px;
}
.page-about .about-reach__figure img{
  display:block;
  width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .about-reach__devices .tabs{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.page-about .about-reach__devices .tab{
  flex:0 1 auto;
  padding:9px 16px;
  border:1px solid var(--pa-line);
  border-radius:var(--radius-pill);
  background:var(--pa-card-soft);
  color:var(--pa-muted);
  font-family:var(--font-body);
  font-size:.88rem;
  cursor:pointer;
  transition:color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.page-about .about-reach__devices .tab:hover,
.page-about .about-reach__devices .tab:focus-visible{
  color:var(--ivory);
  border-color:rgba(230,169,60,.5);
}
.page-about .about-reach__devices .tab[aria-selected="true"],
.page-about .about-reach__devices .tab.is-active{
  color:var(--ink-900);
  background:var(--gold);
  border-color:var(--gold);
}
.page-about .about-reach__devices .tab-panel{
  flex:1 0 100%;
  margin-top:18px;
  padding:22px;
  border:1px solid var(--pa-line);
  border-radius:var(--radius-lg);
  background:var(--pa-card-soft);
}
.page-about .about-reach__devices .tab-panel h3{
  font-family:var(--font-display);
  font-size:1.02rem;
  letter-spacing:-.01em;
  color:var(--ivory);
  margin:0 0 10px;
}
.page-about .about-reach__devices .tab-panel p{
  margin:0;
  font-size:.95rem;
  line-height:1.8;
  color:var(--pa-muted);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team__grid{
  display:grid;
  gap:28px;
}
.page-about .about-team__lead .prose{margin-top:18px;}
.page-about .about-team__facts{
  list-style:none;
  margin:24px 0 0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:10px;
}
.page-about .about-team__facts li{
  display:flex;
  flex-direction:column;
  gap:5px;
  padding:14px 16px;
  border:1px solid var(--pa-line);
  border-radius:var(--radius-md);
  background:var(--pa-card-soft);
}
.page-about .about-team__num{
  font-family:var(--font-display);
  font-size:1.35rem;
  letter-spacing:-.02em;
  color:var(--pa-gold);
  line-height:1;
}
.page-about .about-team__label{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--pa-muted);
}

.page-about .about-team__aside{
  align-self:start;
  padding:26px 24px;
  border:1px solid rgba(200,70,58,.32);
  border-radius:var(--radius-xl);
  background:linear-gradient(160deg, rgba(200,70,58,.14), rgba(17,42,69,.6));
}
.page-about .about-team__aside-label{
  margin:0;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--pa-muted);
}
.page-about .about-team__aside-value{
  margin:10px 0 0;
  font-family:var(--font-display);
  font-size:clamp(2.2rem, 9vw, 3rem);
  letter-spacing:-.03em;
  color:var(--ivory);
  line-height:1;
}
.page-about .about-team__aside-text{
  margin:16px 0 22px;
  font-size:.95rem;
  line-height:1.8;
  color:var(--pa-muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__grid{
  display:grid;
  gap:12px;
}
.page-about .about-next__card{
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:22px 20px;
  border-radius:var(--radius-lg);
  text-decoration:none;
  color:inherit;
  transition:transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.page-about .about-next__card .card__meta{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--pa-gold);
  margin:0;
}
.page-about .about-next__card .card__title{
  font-family:var(--font-display);
  font-size:1.02rem;
  letter-spacing:-.01em;
  color:var(--ivory);
  margin:0;
}
.page-about .about-next__card .card__text{
  margin:0;
  font-size:.92rem;
  line-height:1.75;
  color:var(--pa-muted);
}
.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible{
  transform:translateY(-4px);
  border-color:rgba(230,169,60,.5);
  box-shadow:var(--shadow-lift);
}

/* ---------- 焦点可见性 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
  border-radius:var(--radius-sm);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width:700px){
  .page-about .about-figures{grid-template-columns:repeat(4, minmax(0,1fr));}
  .page-about .section-head{
    grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);
    align-items:end;
    gap:28px;
  }
  .page-about .about-next__grid{grid-template-columns:repeat(2, minmax(0,1fr));}
  .page-about .about-cat__grid{grid-template-columns:minmax(0,1fr);}
}

@media (min-width:960px){
  .page-about{padding-bottom:96px;}
  .page-about .section{padding:88px 0;}
  .page-about .section--tight{padding:56px 0;}

  .page-about .about-hero__grid{
    grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);
    align-items:center;
    gap:56px;
  }
  .page-about .about-hero__viz{margin-top:0;}

  .page-about .about-mission__grid{
    grid-template-columns:minmax(0,1fr) minmax(0,1fr);
    gap:52px;
    align-items:start;
  }
  .page-about .about-timeline__grid{
    grid-template-columns:minmax(0,1fr) minmax(0,.92fr);
    gap:44px;
    align-items:start;
  }
  .page-about .about-cat__grid{
    grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);
    gap:40px;
    align-items:start;
  }
  .page-about .about-cat__figure{margin:0;}
  .page-about .about-team__grid{
    grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);
    gap:44px;
    align-items:start;
  }
  .page-about .about-next__grid{grid-template-columns:repeat(4, minmax(0,1fr));}
  .page-about .about-board .board__side{
    display:grid;
    gap:26px;
  }
}

@media (min-width:1200px){
  .page-about .about-hero h1{letter-spacing:-.035em;}
  .page-about .about-hero__grid{gap:72px;}
  .page-about .about-mission__grid{gap:64px;}
}

@media (prefers-reduced-motion:reduce){
  .page-about .mission-pill,
  .page-about .timeline__item,
  .page-about .about-next__card,
  .page-about .cat-node__chev{
    transition:none;
  }
  .page-about .mission-pill:hover,
  .page-about .timeline__item:hover,
  .page-about .about-next__card:hover{
    transform:none;
  }
}