:root {
  --bg: #111;
  --text: #ddd;
  --panel-bg: rgba(0, 0, 0, 0.5);
  --panel-radius: 10px;
  --font: Arial, sans-serif;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

#gameCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

.panel {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  padding: 12px 14px;
  border-radius: var(--panel-radius);
  background: var(--panel-bg);
  user-select: none;
  line-height: 1.5;
  font-size: 14px;
}

.panel__title {
  margin: 0 0 8px 0;
  font-size: 16px;
}

.panel p {
  margin: 0;
  opacity: 0.95;
}