.cs-hero {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--graphite-line);
}
.cs-title { font-size: clamp(30px, 3.8vw, 46px); margin: 16px 0 18px; letter-spacing: -0.025em; color: var(--on-graphite); }
.cs-sub { color: var(--on-graphite-dim); max-width: 64ch; line-height: 1.75; font-size: 16.5px; }
.cs-badges { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }

.cs-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 60px;
  padding: 56px 0 40px;
  align-items: start;
}

/* sticky pipeline-spine nav */
.checklist {
  position: sticky;
  top: 92px;
  display: flex;
  flex-direction: column;
}
.checklist-spine {
  position: absolute;
  left: 4px; top: 15px; bottom: 15px;
  width: 1.5px;
  background: var(--border-strong);
  overflow: hidden;
}
.checklist-fill {
  position: absolute;
  left: 0; top: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(var(--teal), var(--blue));
  transition: height 0.25s linear;
}
.checklist a {
  position: relative;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
  padding: 11px 0 11px 22px;
  transition: color 0.2s ease;
}
.checklist a::after {
  content: "";
  position: absolute;
  left: 0; top: 15px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--panel);
  border: 1.5px solid var(--border-strong);
  transition: background 0.2s ease, border-color 0.2s ease;
}
.checklist a:last-child::before { bottom: calc(50% - 2px); }
.checklist a.done { color: var(--ink-dim); }
.checklist a.done::after { background: var(--teal); border-color: var(--teal); }
.checklist a.active { color: var(--blue-deep); font-weight: 600; }
.checklist a.active::after { background: var(--blue); border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-tint); }

.cs-sections { display: flex; flex-direction: column; gap: 92px; padding-bottom: 60px; }
.cs-section h2 { font-size: 25px; margin-bottom: 20px; line-height: 1.32; }
.cs-section .eyebrow { margin-bottom: 14px; }
.cs-body { color: var(--ink-dim); line-height: 1.8; font-size: 15.5px; max-width: 68ch; }
.cs-body strong { color: var(--ink); font-weight: 600; }
.cs-body + .cs-body { margin-top: 16px; }

/* workflow diagram */
.flow-wrap { margin-top: 32px; display: flex; flex-direction: column; gap: 22px; }
.flow { display: flex; flex-direction: column; gap: 0; max-width: 520px; }
.flow-step {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 0;
  opacity: 0.4;
  transform: translateX(-8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.flow-step.lit { opacity: 1; transform: translateX(0); }
.flow-step.sim-active { opacity: 1; transform: translateX(0); }
.flow-step .num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--panel);
  background: var(--ink-faint);
  width: 26px; height: 26px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background 0.35s ease, transform 0.2s ease;
}
.flow-step.lit .num { background: var(--blue); }
.flow-step.sim-active .num { background: var(--teal); transform: scale(1.12); }
.flow-step .label { font-size: 14.5px; color: var(--ink-dim); }
.flow-step.lit .label { color: var(--ink); }
.flow-step.sim-active .label { color: var(--teal); font-weight: 500; }
.flow-line { width: 1.5px; height: 16px; background: var(--border-strong); margin-left: 13px; }
.flow-step.branch.lit .num { background: var(--amber); }
.flow-step.branch.lit .label { color: var(--amber); }

/* run-simulation control + readout */
.sim-controls { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.sim-readout {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-faint);
}
.sim-readout .state { color: var(--blue-deep); font-weight: 600; }

/* availability example */
.presence-grid { display: flex; gap: 16px; margin-top: 26px; flex-wrap: wrap; }
.presence-card {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  min-width: 200px;
  background: var(--panel);
}
.presence-card .name { color: var(--ink); margin-bottom: 8px; font-weight: 600; }
.presence-card .stat { display: flex; align-items: center; gap: 8px; color: var(--ink-dim); }
.presence-card .dot { width: 7px; height: 7px; border-radius: 50%; }
.presence-card.eligible { box-shadow: 4px 4px 0 var(--teal-tint); }
.presence-card.excluded { box-shadow: 4px 4px 0 var(--border); }
.presence-card.eligible .dot { background: var(--teal); }
.presence-card.excluded .dot { background: var(--ink-faint); }
.presence-card.eligible .result { color: var(--teal); font-weight: 600; }
.presence-card.excluded .result { color: var(--ink-faint); }

/* demo — premium framed presentation */
.demo-frame {
  border: 1px solid var(--graphite-line-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 28px;
  background: var(--graphite-2);
  box-shadow: 0 24px 50px -22px rgba(0,0,0,0.45);
}
.demo-frame-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--graphite-line);
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--on-graphite-faint);
  letter-spacing: 0.06em;
}
.demo-frame-bar .live-tag { display: inline-flex; align-items: center; gap: 6px; color: #6fe0be; }
.demo-frame-bar .live-tag .status-dot { background: #6fe0be; }
.demo-media { position: relative; overflow: hidden; }
.demo-media img { width: 100%; display: block; }
.demo-scan {
  position: absolute;
  left: 0; right: 0; top: -20%;
  height: 20%;
  background: linear-gradient(180deg, transparent, rgba(124,152,255,0.14), transparent);
  pointer-events: none;
  animation: demoScan 5s ease-in-out infinite;
}
@keyframes demoScan {
  0% { transform: translateY(0); }
  50% { transform: translateY(600%); }
  100% { transform: translateY(0); }
}
.demo-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--on-graphite-dim);
  padding: 13px 18px;
  border-top: 1px solid var(--graphite-line);
}
.demo-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.demo-note { color: var(--ink-dim); font-size: 14px; margin-top: 14px; max-width: 62ch; line-height: 1.7; }
@media (prefers-reduced-motion: reduce) {
  .demo-scan { display: none; }
}

/* exhibit terminal (works as dark contrast panel on light bg) */
.terminal {
  margin-top: 28px;
  background: var(--graphite-2);
  border: 1px solid var(--graphite-line-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 18px 40px -20px rgba(0,0,0,0.4);
}
.terminal-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--graphite-line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--on-graphite-faint);
  letter-spacing: 0.05em;
}
.terminal pre {
  margin: 0;
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--on-graphite-dim);
  overflow-x: auto;
}
.terminal pre .ok { color: #6fe0be; font-weight: 600; }
.terminal pre .muted { color: var(--on-graphite-faint); }

@media (max-width: 860px) {
  .cs-layout { grid-template-columns: 1fr; }
  .checklist {
    position: static;
    flex-direction: row;
    overflow-x: auto;
    gap: 4px;
    padding-bottom: 10px;
  }
  .checklist a { white-space: nowrap; padding-left: 18px; }
  .checklist-spine { display: none; }
}