:root {
  color-scheme: dark;
  --green: #42ff7b;
  --dim: #1d7c43;
  --white: #e8ffe8;
  --amber: #ffd166;
  --red: #ff5f56;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #080a08;
  color: var(--green);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.shell {
  display: grid;
  gap: 14px;
  justify-items: center;
}

.sim {
  padding: 14px;
  border: 1px solid #244f34;
  background: #020402;
  box-shadow: 0 0 0 2px #0d2114, 0 18px 60px rgba(0, 0, 0, 0.45);
}

canvas {
  width: min(92vw, 960px);
  height: auto;
  image-rendering: pixelated;
  display: block;
  border: 1px solid var(--dim);
  outline: none;
  background: #000;
}

.hint {
  margin: 0;
  color: #8bcaa0;
  font-size: 13px;
  text-align: center;
}