.page-about{
  --about-pad: clamp(48px,7vw,96px);
  background: var(--c-void);
  color: var(--c-soft);
}

/* ============ 面包屑 ============ */
.page-about .crumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--c-muted);
}
.page-about .crumb a{
  color:var(--c-turf);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.page-about .crumb a:hover{
  color:var(--c-cyan);
  border-color:var(--c-cyan);
}
.page-about .crumb__sep{color:var(--c-line)}

/* ============ 首屏 ============ */
.page-about .about-hero{
  position:relative;
  overflow:hidden;
  padding:clamp(26px,4vw,40px) 0 clamp(46px,6vw,84px);
  background:
    radial-gradient(120% 80% at 86% 4%,rgba(22,224,207,.12),transparent 62%),
    linear-gradient(170deg,var(--c-void) 0%,var(--c-night) 58%,var(--c-void) 100%);
  border-bottom:1px solid var(--c-line);
}
.page-about .about-hero::after{
  content:"";
  position:absolute;
  right:-14%;
  top:-52%;
  width:min(64%,760px);
  height:210%;
  background:linear-gradient(205deg,rgba(15,138,77,.46),rgba(7,12,16,0) 68%);
  transform:skewX(-12deg);
  pointer-events:none;
}
.page-about .about-hero .shell{position:relative;z-index:1}

.page-about .about-hero__grid{
  display:grid;
  gap:clamp(28px,4vw,52px);
  margin-top:clamp(22px,3.4vw,40px);
}
.page-about .about-hero h1{
  margin:.3em 0 .55em;
  font-weight:900;
  font-size:clamp(30px,5.6vw,58px);
  line-height:1.08;
  letter-spacing:-.02em;
  color:var(--c-paper);
}
.page-about .about-hero .lead{
  margin:0;
  max-width:64ch;
  font-size:clamp(15px,1.6vw,17px);
  line-height:1.82;
  color:var(--c-soft);
}

.page-about .hero-facts{
  list-style:none;
  margin:0;
  padding:1px;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:var(--c-line);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}
.page-about .hero-facts li{
  background:var(--c-night);
  padding:16px 14px;
}
.page-about .hero-facts b{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(19px,2.4vw,26px);
  line-height:1.1;
  letter-spacing:.02em;
  color:var(--c-cyan);
}
.page-about .hero-facts span{
  display:block;
  margin-top:7px;
  font-size:12px;
  line-height:1.5;
  letter-spacing:.06em;
  color:var(--c-muted);
}

/* ============ 区块骨架 ============ */
.page-about .band{
  position:relative;
  padding:var(--about-pad) 0;
}
.page-about .band--timeline{
  background:linear-gradient(180deg,var(--c-void) 0%,var(--c-night) 22%,var(--c-night) 78%,var(--c-void) 100%);
}
.page-about .band--library{
  background:var(--c-paper);
  color:var(--c-ink);
}
.page-about .band--team{
  background:linear-gradient(200deg,var(--c-night) 0%,var(--c-void) 58%);
}
.page-about .band--scale{background:var(--c-void)}
.page-about .band--next{
  background:linear-gradient(180deg,var(--c-void) 0%,#0B141A 100%);
}

.page-about .band h2{
  margin:.28em 0 0;
  font-weight:900;
  letter-spacing:-.02em;
  font-size:clamp(24px,3.4vw,38px);
  line-height:1.16;
  color:var(--c-paper);
}
.page-about .band--library h2{color:var(--c-ink)}

.page-about .band__head{
  display:grid;
  gap:14px;
  margin-bottom:clamp(28px,4vw,48px);
}
.page-about .band__note{
  margin:0;
  font-size:14.5px;
  line-height:1.78;
  color:var(--c-muted);
}
.page-about .band--library .band__note{color:#5A6A74}

.page-about .band__grid{
  display:grid;
  gap:clamp(24px,4vw,56px);
}
.page-about .band__body{
  display:grid;
  gap:18px;
  max-width:72ch;
}
.page-about .band__body p{
  margin:0;
  font-size:16px;
  line-height:1.84;
  color:var(--c-soft);
}

/* ============ 时间轴 ============ */
.page-about .band__figure{
  margin:0 0 clamp(30px,4vw,52px);
}
.page-about .band--timeline .media-frame{
  border:1px solid var(--c-line);
  background:var(--c-night);
}

.page-about .tl{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .tl::before{
  content:"";
  position:absolute;
  left:9px;
  top:4px;
  bottom:4px;
  width:2px;
  border-radius:2px;
  background:linear-gradient(180deg,var(--c-turf),var(--c-cyan) 52%,var(--c-volt));
  opacity:.42;
}
.page-about .tl__item{
  position:relative;
  padding-left:36px;
  margin:0 0 18px;
}
.page-about .tl__item:last-child{margin-bottom:0}

.page-about .tl__dot{
  position:absolute;
  left:0;
  top:8px;
  width:20px;
  height:20px;
  border-radius:50%;
  background:var(--c-void);
  border:2px solid var(--c-turf);
  box-shadow:0 0 0 4px rgba(47,191,113,.12);
  z-index:2;
}
.page-about .tl__item:last-child .tl__dot{
  border-color:var(--c-volt);
  box-shadow:0 0 0 4px rgba(223,249,75,.14);
}

.page-about .tl__phase{
  margin:0 0 8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--c-turf);
}

.page-about .tl__card{
  background:var(--c-night);
  border:1px solid var(--c-line);
  padding:18px 16px 16px;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.page-about .tl__item:has([aria-expanded="true"]) .tl__card{
  border-color:rgba(22,224,207,.55);
  background:#0C151C;
}

.page-about .tl__heading{margin:0}
.page-about .tl__trigger{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:14px;
  width:100%;
  margin:0;
  padding:0;
  background:none;
  border:0;
  font-family:inherit;
  font-size:clamp(16px,1.9vw,19px);
  font-weight:800;
  line-height:1.42;
  text-align:left;
  color:var(--c-paper);
  cursor:pointer;
  transition:color var(--dur) var(--ease);
}
.page-about .tl__trigger:hover{color:var(--c-cyan)}
.page-about .tl__trigger:focus-visible{
  outline:2px solid var(--c-cyan);
  outline-offset:3px;
}
.page-about .tl__trigger[aria-expanded="true"]{color:var(--c-cyan)}

.page-about .tl__summary{
  margin:10px 0 0;
  font-size:14.8px;
  line-height:1.78;
  color:var(--c-muted);
}

.page-about .tl__card .accordion__panel-inner{
  margin-top:14px;
  padding-top:14px;
  border-top:1px solid var(--c-line);
  font-size:14.8px;
  line-height:1.8;
  color:var(--c-soft);
}

/* ============ 资料库 ============ */
.page-about .lib__split{
  display:grid;
  gap:clamp(24px,3.6vw,50px);
  margin-bottom:clamp(34px,4.6vw,56px);
}
.page-about .lib__figure{margin:0}
.page-about .band--library .media-frame{
  border:1px solid #C9D6D1;
  background:#E4EDE9;
}
.page-about .band--library .media-frame__caption{color:#4E616B}

.page-about .lib__side p{
  margin:0 0 16px;
  font-size:16px;
  line-height:1.84;
  color:#2A3B45;
}
.page-about .lib__side p:last-child{margin-bottom:0}

.page-about .band--library .tabset__list{
  border-bottom:1px solid #C9D6D1;
}

.page-about .lib__scroll{
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  border:1px solid #C9D6D1;
}
.page-about .lib__table{
  width:100%;
  min-width:560px;
  border-collapse:collapse;
  font-size:14.5px;
}
.page-about .lib__table caption{
  caption-side:top;
  text-align:left;
  padding:12px 14px;
  background:#E4EDE9;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:#4E616B;
}
.page-about .lib__table thead th{
  background:var(--c-pitch);
  color:#EAF7EF;
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.12em;
  text-align:left;
  padding:11px 14px;
  white-space:nowrap;
}
.page-about .lib__table tbody th{
  text-align:left;
  font-weight:700;
  color:var(--c-ink);
  padding:12px 14px;
  border-top:1px solid #D8E2DD;
  white-space:nowrap;
}
.page-about .lib__table tbody td{
  padding:12px 14px;
  border-top:1px solid #D8E2DD;
  color:#33454F;
  line-height:1.6;
}
.page-about .lib__table tbody tr:nth-child(even){background:#E9F1ED}

/* ============ 团队 ============ */
.page-about .team__grid{
  display:grid;
  gap:clamp(26px,4vw,54px);
}
.page-about .team__stat{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:1px;
  background:var(--c-line);
  align-content:start;
}
.page-about .team__stat li{
  background:var(--c-night);
  padding:20px 16px;
  border-left:3px solid var(--c-pitch);
}
.page-about .team__stat b{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(28px,3.6vw,44px);
  line-height:1;
  color:var(--c-turf);
}
.page-about .team__stat span{
  display:block;
  margin-top:9px;
  font-size:13px;
  line-height:1.6;
  letter-spacing:.05em;
  color:var(--c-muted);
}

.page-about .team__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:14px;
}
.page-about .team__list li{
  padding-left:16px;
  border-left:2px solid var(--c-pitch);
  font-size:15px;
  line-height:1.78;
  color:var(--c-soft);
}
.page-about .team__list b{
  color:var(--c-paper);
  font-weight:700;
}

/* ============ 规模 ============ */
.page-about .scale__figure{
  margin:0 0 clamp(28px,4vw,44px);
  border:1px solid var(--c-line);
}
.page-about .scale__grid{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  background:var(--c-line);
}
.page-about .scale__grid li{
  background:var(--c-void);
  padding:clamp(18px,2.4vw,28px) 16px;
}
.page-about .scale__grid b{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(30px,4.4vw,52px);
  line-height:1;
  letter-spacing:-.01em;
  color:var(--c-cyan);
}
.page-about .scale__grid b em{
  font-style:normal;
  font-size:.5em;
  margin-left:.15em;
  color:var(--c-turf);
}
.page-about .scale__grid span{
  display:block;
  margin-top:10px;
  font-size:13px;
  line-height:1.62;
  color:var(--c-muted);
}

/* ============ 规划 ============ */
.page-about .next__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:1px;
  background:var(--c-line);
}
.page-about .next__list li{
  background:var(--c-night);
  padding:clamp(20px,2.6vw,30px);
  position:relative;
}
.page-about .next__list li::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:38px;
  height:3px;
  background:var(--c-turf);
}
.page-about .next__list h3{
  margin:0 0 10px;
  font-size:clamp(17px,2vw,20px);
  font-weight:800;
  line-height:1.4;
  color:var(--c-paper);
}
.page-about .next__list p{
  margin:0;
  font-size:14.8px;
  line-height:1.78;
  color:var(--c-muted);
}

/* ============ 收尾 ============ */
.page-about .band--cta{
  background:linear-gradient(120deg,var(--c-pitch) 0%,#0B6B3D 52%,var(--c-void) 100%);
  padding:clamp(46px,6vw,84px) 0;
}
.page-about .cta__inner{
  display:grid;
  gap:24px;
}
.page-about .cta__inner h2{
  margin:.3em 0 .5em;
  font-size:clamp(24px,3.4vw,38px);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.16;
  color:var(--c-paper);
}
.page-about .cta__inner p{
  margin:0;
  max-width:58ch;
  font-size:15.5px;
  line-height:1.82;
  color:rgba(242,246,244,.88);
}
.page-about .cta-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:16px;
}
.page-about .cta-row .link-arrow{color:var(--c-paper)}
.page-about .cta-row .link-arrow:hover{color:var(--c-volt)}

/* ============ 响应式 ============ */
@media (min-width:820px){
  .page-about .band__head{
    grid-template-columns:minmax(0,1fr) minmax(0,min(40ch,40%));
    align-items:end;
    gap:clamp(24px,4vw,60px);
  }
  .page-about .next__list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .page-about .cta__inner{
    grid-template-columns:minmax(0,1fr) auto;
    align-items:center;
  }
}

@media (min-width:880px){
  .page-about .about-hero__grid{
    grid-template-columns:minmax(0,7fr) minmax(0,5fr);
    align-items:end;
  }
  .page-about .band__grid{
    grid-template-columns:minmax(0,5fr) minmax(0,7fr);
    align-items:start;
  }
  .page-about .lib__split{
    grid-template-columns:minmax(0,5fr) minmax(0,7fr);
    align-items:start;
  }
  .page-about .team__grid{
    grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  }
  .page-about .scale__grid{grid-template-columns:repeat(4,minmax(0,1fr))}
}

@media (min-width:900px){
  .page-about .tl::before{
    left:50%;
    transform:translateX(-1px);
  }
  .page-about .tl__item{
    width:calc(50% - 46px);
    padding-left:0;
    margin-bottom:26px;
  }
  .page-about .tl__item:nth-child(odd){
    margin-left:0;
    margin-right:auto;
  }
  .page-about .tl__item:nth-child(even){
    margin-left:auto;
    margin-right:0;
  }
  .page-about .tl__item:nth-child(odd) .tl__dot{
    left:auto;
    right:-56px;
    top:8px;
  }
  .page-about .tl__item:nth-child(even) .tl__dot{
    left:-56px;
    top:8px;
  }
}

@media (max-width:560px){
  .page-about .hero-facts{grid-template-columns:1fr}
  .page-about .scale__grid{grid-template-columns:1fr}
  .page-about .tl__card{padding:16px 14px 14px}
}