:root{
  --bg:#070a12;
  --panel:#0d1222;
  --text:#e7ecff;
  --muted:#9aa7d6;
  --accent:#59ffa6;
  --danger:#ff5a7a;
  --warn:#ffd36b;
  --border:rgba(255,255,255,.10);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  min-height: 100vh;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: radial-gradient(1200px 600px at 50% 20%, #121a33 0%, var(--bg) 55%, #03040a 100%);
  color:var(--text);
  display:grid;
  place-items:center;
}

.wrap{
  width:min(720px, 92vw);
  display:grid;
  gap:12px;
}

.hud{
  background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--border);
  border-radius:14px;
  padding:10px 12px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  backdrop-filter: blur(10px);
}

.hud__left{
  display:flex;
  gap:18px;
  flex-wrap:wrap;
  font-variant-numeric: tabular-nums;
}
.label{
  color:var(--muted);
  margin-right:6px;
  font-size:12px;
  letter-spacing:.08em;
  text-transform:uppercase;
}

.hud__right{ display:flex; gap:10px; }

.btn{
  appearance:none;
  border:1px solid var(--border);
  background:rgba(255,255,255,.06);
  color:var(--text);
  padding:8px 10px;
  border-radius:10px;
  cursor:pointer;
  font-weight:600;
}
.btn:hover{ background:rgba(255,255,255,.10); }
.btn:active{ transform: translateY(1px); }

.btn--primary{
  border-color: rgba(89,255,166,.35);
  background: rgba(89,255,166,.14);
}
.btn--primary:hover{ background: rgba(89,255,166,.22); }

.stageWrap{
  position:relative;
  display:grid;
  place-items:center;
}

canvas{
  display:block;
  width: min(480px, 92vw);
  height: auto;
  border-radius:16px;
  border:1px solid var(--border);
  background:
    radial-gradient(800px 800px at 50% 20%, rgba(89,255,166,.06), rgba(0,0,0,0) 55%),
    linear-gradient(180deg, #070a12, #04050b);
  box-shadow:
    0 20px 60px rgba(0,0,0,.55),
    inset 0 0 0 1px rgba(255,255,255,.04);
}

.overlay{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:16px;
}
.hidden{ display:none; }

.overlay__card{
  width:min(440px, 92%);
  background: rgba(13,18,34,.86);
  border:1px solid var(--border);
  border-radius:16px;
  padding:18px 16px;
  text-align:center;
  box-shadow: 0 16px 50px rgba(0,0,0,.55);
}
.overlay__card h1{
  margin:0 0 8px 0;
  font-size:22px;
}
.overlay__card p{
  margin:0 0 14px 0;
  color:var(--muted);
  line-height:1.5;
}
kbd{
  border:1px solid var(--border);
  background: rgba(255,255,255,.07);
  padding:2px 7px;
  border-radius:8px;
  font-size: 12px;
  color: var(--text);
}

.help{
  color:var(--muted);
  font-size:13px;
  text-align:center;
}