:root{
  --ink:#132927;
  --muted:#52625e;
  --paper:#f3f6f2;
  --line:#d3dcd6;
  --lime:#c9ef69;
  --rail:#102625;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--signal-sans,system-ui,-apple-system,"Segoe UI",sans-serif);
  font-size:16px;
  line-height:1.5;
}
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:220px;
  background:var(--rail);
  color:#e8efe9;
  padding:24px 18px;
  z-index:20;
}
.brand{
  font-weight:700;
  font-size:22px;
  letter-spacing:-.5px;
  color:inherit;
  text-decoration:none;
}
.dot{
  display:inline-block;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--lime);
  margin-left:2px;
}
.rail nav{display:grid;gap:4px;margin-top:28px}
.rail nav a{
  color:#c7d3cd;
  text-decoration:none;
  padding:10px 12px;
  border-radius:10px;
}
.rail nav a.on{background:#1d3a37;color:#fff}
.rail-note{font-size:12px;color:#9fb1aa;margin-top:28px}
.mhead{display:none}
main{
  margin-left:220px;
  padding:40px 48px 80px;
  max-width:1280px;
}
.eyebrow{
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:#678072;
  margin:0 0 16px;
}
.hero{
  display:grid;
  grid-template-columns:1fr 1.2fr;
  gap:28px;
  align-items:center;
  background:linear-gradient(180deg,#fff,#f7faf5);
  padding:36px 40px 32px;
  margin:0;
}
.badge{
  display:inline-block;
  background:var(--lime);
  color:var(--ink);
  font-weight:650;
  border-radius:999px;
  padding:5px 12px;
  font-size:12px;
}
.hero h1{
  margin:16px 0 12px;
  font-size:clamp(36px,4.6vw,52px);
  line-height:1.05;
  letter-spacing:-1.5px;
  font-weight:650;
}
.lede{
  color:var(--muted);
  font-size:17px;
  max-width:46ch;
  margin:0 0 8px;
  line-height:1.55;
}
.legend{
  display:flex;
  gap:16px;
  flex-wrap:wrap;
  font-size:13px;
  color:var(--muted);
  margin:14px 0 22px;
}
.legend i{
  display:inline-block;
  width:10px;
  height:10px;
  border-radius:50%;
  margin-right:6px;
}
.scene{width:100%;height:auto}
.scene .gc{fill:none;stroke:var(--line);stroke-width:1}
.scene .ln{fill:none;stroke:var(--ink);stroke-opacity:.25;stroke-width:2;stroke-dasharray:4 6;animation:dash 1.6s linear infinite}
.scene .ln.walk{stroke-opacity:.12;stroke-width:1.5}
.scene .blk{animation:bob 4s ease-in-out infinite}
.scene .core{animation-duration:3s}
.scene .mark{pointer-events:none}
.scene .agent{pointer-events:none}
.scene .agent .legs{transform-origin:0 5px;animation:stride .38s ease-in-out infinite}
.scene .agent .agent-body{transform-origin:0 0;animation:bobble .76s ease-in-out infinite}
.scene .agent.user .legs{animation-duration:.34s}
.scene .agent.user .agent-body{animation-duration:.68s}
@keyframes dash{to{stroke-dashoffset:-20}}
@keyframes bob{50%{transform:translateY(-4px)}}
@keyframes stride{0%,100%{transform:scaleY(1)}50%{transform:scaleY(.78) translateY(1.2px)}}
@keyframes bobble{0%,100%{transform:translateY(0)}50%{transform:translateY(-1.5px)}}
@media (prefers-reduced-motion:reduce){
  .scene *{animation:none!important}
  .scene animateMotion{display:none}
}
.cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:0 22px;
  border-radius:12px;
  background:var(--ink);
  color:#fff;
  font:inherit;
  font-weight:650;
  text-decoration:none;
}
.btn:hover{background:#2d5045}
.btn.ghost{
  background:#eef2e8;
  color:var(--ink);
  border:1px solid #d8e1d0;
}
.btn.ghost:hover{background:#e4ecdb}
.cta-note{
  margin:14px 0 0;
  font-size:13px;
  color:var(--muted);
  max-width:52ch;
}
.cards{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:16px;
  margin-top:28px;
}
.card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  padding:24px 22px 26px;
  box-shadow:0 1px 2px rgba(19,41,39,.04),0 8px 24px rgba(19,41,39,.05);
}
.step{
  margin:0 0 12px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  color:#678072;
}
.card h2{
  margin:0 0 10px;
  font-size:20px;
  letter-spacing:-.4px;
}
.card p{
  margin:0;
  color:var(--muted);
  font-size:15px;
  line-height:1.55;
}
.foot{
  margin-top:40px;
  padding-top:18px;
  border-top:1px solid var(--line);
  color:var(--muted);
  font-size:13px;
  max-width:58ch;
}
.chip{
  display:inline-block;
  border-radius:999px;
  padding:3px 10px;
  font-size:12px;
  font-weight:600;
}
.chip.paper{background:var(--ink);color:var(--lime)}
@media (max-width:820px){
  .rail{display:none}
  .mhead{
    display:flex;
    justify-content:space-between;
    align-items:center;
    position:sticky;
    top:0;
    z-index:22;
    background:var(--rail);
    color:#fff;
    padding:calc(10px + env(safe-area-inset-top)) 16px 10px;
  }
  .mhead .brand{color:#fff;font-size:18px}
  main{margin-left:0;padding:20px 16px 48px}
  .hero{grid-template-columns:1fr;padding:24px 20px 18px;gap:8px}
  .hero h1{letter-spacing:-1.2px;font-size:36px}
  .cards{grid-template-columns:1fr}
  .btn{width:100%}
}

@media (max-width:1100px){
  .hero{grid-template-columns:1fr}
}