.page-about{
  --about-cut:18px;
  --about-glow:radial-gradient(circle at 82% 8%, rgba(53,224,208,.16), transparent 58%);
  --about-accent-line:linear-gradient(90deg, rgba(53,224,208,.9), rgba(53,224,208,0));
  padding-bottom:clamp(48px,8vw,96px);
  background:var(--about-glow);
}

.page-about .about-shell{
  padding-top:clamp(18px,3vw,28px);
}

.page-about .breadcrumb{
  margin-bottom:clamp(20px,4vw,36px);
}

/* ---------- Hero ---------- */
.page-about .about-hero{
  position:relative;
  padding:clamp(22px,5vw,48px) 0 clamp(30px,6vw,58px);
  border-bottom:1px solid var(--line);
}

.page-about .about-hero::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-1px;
  width:min(220px,40%);
  height:2px;
  background:var(--about-accent-line);
}

.page-about .about-hero h1{
  margin:.35em 0 0;
  font-size:clamp(2.35rem,8vw,5rem);
  font-weight:900;
  line-height:1.04;
  letter-spacing:-.02em;
  color:var(--text-strong);
  text-wrap:balance;
}

.page-about .about-hero .lede{
  max-width:56ch;
  margin-top:clamp(16px,3vw,26px);
  color:var(--silver);
}

.page-about .hero-metrics{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  margin:clamp(24px,4vw,40px) 0 0;
  padding:0;
  list-style:none;
  background:var(--line);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - var(--about-cut)) 0,100% var(--about-cut),100% 100%,var(--about-cut) 100%,0 calc(100% - var(--about-cut)));
}

.page-about .hero-metrics li{
  display:flex;
  flex-direction:column;
  gap:.35em;
  padding:16px 14px;
  background:var(--ink-800);
}

.page-about .hm-num{
  font-size:clamp(1.5rem,4.6vw,2.35rem);
  font-weight:800;
  color:var(--cyan);
  line-height:1;
}

.page-about .hero-metrics li:last-child .hm-num{
  color:var(--orange);
}

.page-about .hm-label{
  font-size:.78rem;
  line-height:1.5;
  letter-spacing:.02em;
  color:var(--steel);
}

/* ---------- Body layout ---------- */
.page-about .about-body{
  display:grid;
  gap:clamp(26px,4vw,44px);
  margin-top:clamp(28px,5vw,52px);
}

.page-about .about-toc{
  border:1px solid var(--line);
  border-left:2px solid rgba(53,224,208,.5);
  background:linear-gradient(160deg, rgba(13,35,64,.85), rgba(7,20,38,.6));
  padding:16px 16px 18px;
  align-self:start;
}

.page-about .toc-title{
  margin:0 0 12px;
  font-size:.72rem;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--cyan);
}

.page-about .toc-list{
  display:grid;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:none;
}

.page-about .toc-list a{
  display:flex;
  gap:10px;
  align-items:baseline;
  padding:8px 6px;
  color:var(--silver);
  font-size:.9rem;
  line-height:1.4;
  text-decoration:none;
  border-bottom:1px solid rgba(107,135,168,.14);
  transition:color .18s var(--ease), background .18s var(--ease), padding-left .18s var(--ease);
}

.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible{
  color:var(--ice);
  background:rgba(53,224,208,.08);
  padding-left:12px;
}

.page-about .toc-num{
  color:var(--steel);
  font-size:.78rem;
  flex:none;
}

.page-about .toc-list a:hover .toc-num,
.page-about .toc-list a:focus-visible .toc-num{
  color:var(--cyan);
}

.page-about .toc-note{
  margin:14px 0 0;
  font-size:.8rem;
  line-height:1.6;
  color:var(--steel);
}

.page-about .toc-note a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(53,224,208,.4);
}

/* ---------- Sections ---------- */
.page-about .about-sec{
  padding-bottom:clamp(34px,6vw,60px);
  border-bottom:1px solid var(--line);
  scroll-margin-top:calc(var(--topbar-h) + 24px);
}

.page-about .about-sec--last{
  border-bottom:0;
  padding-bottom:0;
}

.page-about .sec-head{
  display:flex;
  gap:14px;
  align-items:flex-start;
  margin-bottom:clamp(16px,3vw,24px);
}

.page-about .sec-num{
  font-size:clamp(1.6rem,5vw,2.6rem);
  font-weight:800;
  line-height:1;
  color:rgba(53,224,208,.55);
  flex:none;
}

.page-about .sec-title{
  margin:0;
  font-size:clamp(1.45rem,4.2vw,2.15rem);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-.01em;
  color:var(--text-strong);
}

.page-about .sec-sub{
  margin:6px 0 0;
  font-size:.84rem;
  letter-spacing:.04em;
  color:var(--steel);
}

.page-about .prose p{
  margin:0 0 1em;
  color:var(--text);
}

.page-about .prose p:last-child,
.page-about .prose-p:last-child{
  margin-bottom:0;
}

.page-about .prose-p{
  margin:0 0 1em;
  color:var(--text);
}

.page-about .prose a,
.page-about .prose-p a{
  color:var(--cyan);
  text-decoration:none;
  border-bottom:1px solid rgba(53,224,208,.38);
}

.page-about .prose a:hover,
.page-about .prose-p a:hover{
  border-bottom-color:var(--cyan);
}

/* ---------- Scene list ---------- */
.page-about .scene-list{
  display:grid;
  gap:1px;
  margin:clamp(18px,3vw,26px) 0 0;
  padding:0;
  list-style:none;
  background:var(--line);
  border:1px solid var(--line);
}

.page-about .scene-list li{
  background:var(--panel);
  padding:16px 16px 18px;
}

.page-about .scene-list p{
  margin:10px 0 0;
  font-size:.94rem;
  color:var(--text);
}

/* ---------- Crew ---------- */
.page-about .crew-grid{
  display:grid;
  gap:clamp(20px,3vw,30px);
}

.page-about .seg{
  margin:18px 0 16px;
}

.page-about .crew-bars{
  display:grid;
  gap:14px;
  padding:18px 16px;
  border:1px solid var(--line);
  background:linear-gradient(150deg, rgba(13,35,64,.8), rgba(2,8,18,.55));
  clip-path:polygon(0 0,calc(100% - var(--about-cut)) 0,100% var(--about-cut),100% 100%,0 100%);
}

.page-about .bar-row{
  display:grid;
  grid-template-columns:minmax(84px,34%) 1fr auto;
  align-items:center;
  gap:10px;
}

.page-about .bar-label{
  font-size:.82rem;
  color:var(--silver);
  line-height:1.3;
}

.page-about .bar-track{
  display:block;
  height:9px;
  background:rgba(107,135,168,.18);
  overflow:hidden;
}

.page-about .bar-fill{
  display:block;
  height:100%;
  background:linear-gradient(90deg, rgba(53,224,208,.55), var(--cyan));
}

.page-about .bar-fill--32{ width:37%; }
.page-about .bar-fill--24{ width:28%; background:linear-gradient(90deg, rgba(255,138,61,.45), var(--orange)); }
.page-about .bar-fill--18{ width:21%; }
.page-about .bar-fill--12{ width:14%; background:linear-gradient(90deg, rgba(107,135,168,.5), var(--steel)); }

.page-about .bar-value{
  font-size:.82rem;
  color:var(--ice);
}

.page-about .crew-list{
  display:grid;
  gap:1px;
  margin:0;
  padding:0;
  list-style:none;
  background:var(--line);
  border:1px solid var(--line);
}

.page-about .crew-list li{
  background:var(--ink-800);
  padding:14px 15px 16px;
}

.page-about .crew-list p{
  margin:8px 0 0;
  font-size:.9rem;
  color:var(--text);
}

.page-about .crew-figure{
  margin:0;
  align-self:start;
}

.page-about .crew-figure figcaption,
.page-about .network-figure figcaption,
.page-about .version-figure figcaption{
  margin-top:10px;
  font-size:.78rem;
  line-height:1.6;
  color:var(--steel);
}

/* ---------- Flow steps ---------- */
.page-about .flow-steps{
  display:grid;
  gap:12px;
  margin:clamp(18px,3vw,26px) 0 0;
  padding:0;
  list-style:none;
}

.page-about .flow-step{
  position:relative;
  padding:16px 16px 18px 16px;
  border:1px solid var(--line);
  background:var(--panel);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--about-cut)),calc(100% - var(--about-cut)) 100%,0 100%);
}

.page-about .flow-step h3{
  margin:0 0 6px;
  font-size:1rem;
  font-weight:700;
  color:var(--text-strong);
}

.page-about .flow-step p{
  margin:0;
  font-size:.9rem;
  color:var(--text);
}

.page-about .step-idx{
  display:inline-block;
  margin-bottom:8px;
  padding:1px 7px;
  font-size:.74rem;
  color:var(--ink-900);
  background:var(--cyan);
}

.page-about .flow-note{
  margin-top:clamp(18px,3vw,26px);
}

.page-about .flow-note h3{
  margin:0 0 8px;
  font-size:1.05rem;
  color:var(--text-strong);
}

.page-about .flow-note p{
  margin:0 0 16px;
  color:var(--text);
  font-size:.94rem;
}

/* ---------- Versions ---------- */
.page-about .version-figure{
  margin:0 0 clamp(20px,3vw,28px);
}

.page-about .about-timeline{
  margin:0;
  padding:0 0 0 22px;
  border-left:1px solid var(--line-strong);
  list-style:none;
}

.page-about .tl-item{
  position:relative;
  padding:0 0 22px 4px;
  outline:none;
}

.page-about .tl-item::before{
  content:"";
  position:absolute;
  left:-28px;
  top:6px;
  width:11px;
  height:11px;
  background:var(--ink-900);
  border:2px solid var(--cyan);
  transform:rotate(45deg);
  transition:background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .tl-item:last-child{
  padding-bottom:0;
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before,
.page-about .tl-item:focus::before{
  background:var(--cyan);
  box-shadow:0 0 0 5px rgba(53,224,208,.16);
}

.page-about .tl-node{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px;
}

.page-about .tl-ver{
  font-size:.86rem;
  font-weight:800;
  color:var(--orange);
  letter-spacing:.02em;
}

.page-about .tl-node h3{
  margin:0;
  font-size:1.02rem;
  font-weight:700;
  color:var(--text-strong);
}

.page-about .tl-points{
  margin:8px 0 0;
  font-size:.9rem;
  color:var(--text);
}

.page-about .tl-foot{
  margin-top:clamp(18px,3vw,26px);
}

/* ---------- Network ---------- */
.page-about .network-grid{
  display:grid;
  gap:clamp(18px,3vw,28px);
}

.page-about .network-copy p{
  margin:0 0 1em;
  color:var(--text);
}

.page-about .network-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px 14px;
  margin:6px 0 0;
  padding:0;
  list-style:none;
  font-size:.84rem;
  color:var(--steel);
}

.page-about .network-tags li{
  display:flex;
  align-items:center;
  gap:6px;
}

.page-about .network-figure{
  margin:0;
}

/* ---------- Reach ---------- */
.page-about .reach-actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:clamp(16px,3vw,22px) 0 clamp(20px,3vw,28px);
}

.page-about .reach-points{
  display:grid;
  gap:1px;
  margin:0;
  padding:0;
  list-style:none;
  background:var(--line);
  border:1px solid var(--line);
}

.page-about .reach-points li{
  background:var(--ink-800);
  padding:14px 16px 16px;
}

.page-about .reach-points h3{
  margin:0 0 6px;
  font-size:.95rem;
  color:var(--text-strong);
}

.page-about .reach-points p{
  margin:0;
  font-size:.88rem;
  color:var(--text);
}

/* ---------- Responsive ---------- */
@media (min-width:640px){
  .page-about .hero-metrics{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
  .page-about .scene-list{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
  .page-about .flow-steps{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .page-about .reach-points{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
}

@media (min-width:900px){
  .page-about .about-body{
    grid-template-columns:236px minmax(0,1fr);
    gap:clamp(32px,4vw,56px);
    align-items:start;
  }

  .page-about .about-toc{
    position:sticky;
    top:calc(var(--topbar-h) + 20px);
  }

  .page-about .crew-grid{
    grid-template-columns:minmax(0,1.35fr) minmax(0,.85fr);
    align-items:start;
  }

  .page-about .flow-steps{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }

  .page-about .flow-step:nth-child(1),
  .page-about .flow-step:nth-child(2),
  .page-about .flow-step:nth-child(3){
    transform:translateY(0);
  }

  .page-about .flow-step:nth-child(even){
    transform:translateY(12px);
  }

  .page-about .network-grid{
    grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);
    align-items:center;
  }

  .page-about .tl-points{
    max-height:0;
    opacity:0;
    overflow:hidden;
    transition:max-height .26s var(--ease), opacity .22s var(--ease), margin .22s var(--ease);
  }

  .page-about .tl-item:hover .tl-points,
  .page-about .tl-item:focus .tl-points,
  .page-about .tl-item:focus-within .tl-points{
    max-height:220px;
    opacity:1;
  }

  .page-about .about-hero h1{
    max-width:16ch;
  }
}

@media (min-width:1100px){
  .page-about .about-toc{
    padding:20px 18px 22px;
  }
  .page-about .flow-steps{
    grid-template-columns:repeat(5,minmax(0,1fr));
  }
  .page-about .flow-step:nth-child(even){
    transform:translateY(14px);
  }
}

@media (prefers-reduced-motion:reduce){
  .page-about .toc-list a,
  .page-about .tl-points,
  .page-about .tl-item::before{
    transition:none;
  }
}
</main>