:root {
  --bg: #05060a;
  --panel: rgba(12, 16, 30, .84);
  --gold: #f5c95c;
  --cyan: #5be8ff;
  --text: #f7f2df;
  --muted: #9aa8bd;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 50% 0%, #17203c 0, var(--bg) 44rem);
  color: var(--text);
  font-family: Inter, Segoe UI, system-ui, sans-serif;
  display: grid;
  place-items: center;
}
.game-shell {
  width: min(1120px, calc(100vw - 24px));
  display: grid;
  gap: 12px;
}
.hud {
  min-height: 58px;
  padding: 10px 12px;
  border: 1px solid rgba(91, 232, 255, .18);
  background: var(--panel);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
}
.hud strong { display: block; color: var(--gold); }
.hud span, .help { color: var(--muted); font-size: 14px; }
.back, button {
  border: 1px solid rgba(245, 201, 92, .34);
  background: rgba(245, 201, 92, .12);
  color: var(--gold);
  padding: 9px 12px;
  text-decoration: none;
  font: inherit;
  cursor: pointer;
}
canvas {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(91, 232, 255, .22);
  background: #03040a;
  display: block;
}
@media (max-width: 720px) {
  .hud { grid-template-columns: 1fr; }
}