:root {
  --bg: #0f0f1b;
  --panel: #1d1d2e;
  --ink: #e8e8f0;
  --accent: #f7d51d;
  --green: #4bd35b;
  --red: #e3453a;
  --zone: #3a7d44;
  font-family: "Courier New", monospace;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  image-rendering: pixelated;
}
#app { width: 100%; max-width: 720px; }
.title {
  text-transform: uppercase;
  letter-spacing: 2px;
  text-shadow: 2px 2px 0 #000;
}
.btn {
  font-family: inherit;
  font-weight: bold;
  color: #000;
  background: var(--accent);
  border: 3px solid #000;
  box-shadow: 3px 3px 0 #000;
  padding: 10px 14px;
  cursor: pointer;
  text-transform: uppercase;
}
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 #000; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }