:root {
  --bg: #000;
  --panel: #111;
  --accent: #00ff00;
  --text: #c8ffc8;
  --border: #0f0;
}

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  text-align: center;
}

.snake-wrap {
  width: max-content;
  margin: 18px auto;
  border: 2px solid var(--border);
  background: var(--panel);
}

.snake-header {
  color: var(--accent);
  padding: 6px 10px;
  font-size: 16px;
  border-bottom: 1px dashed rgba(0,255,0,0.25);
}

.snake-canvas {
  display: block;
  background:
    linear-gradient(transparent 0 50%, rgba(255,255,255,0.025) 50% 100%),
    #111;
  image-rendering: pixelated;
}

.snake-help {
  color: #9dff9d;
  font-size: 12px;
  padding-bottom: 10px;
}