:root {
  --bg-primary: #0F172A;
  --bg-secondary: #101a2c;
  --bg-tertiary: #2b3b56;
  --text-primary: #f5faff;
  --focus-ring: #6cd6ff;
  --focus-glow: rgba(108, 214, 255, 0.35);
  --radius-md: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background:
    radial-gradient(900px 600px at 15% 10%, #17253d 0%, transparent 55%),
    radial-gradient(800px 500px at 85% 90%, #101d31 0%, transparent 55%),
    var(--bg-primary);
  color: var(--text-primary);
  width: 600px;
  height: 600px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#app {
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

#game-canvas {
  width: 100%;
  height: 100%;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 2px solid var(--bg-tertiary);
  box-shadow: 0 0 0 1px rgba(108, 214, 255, 0.2), 0 14px 36px rgba(0, 0, 0, 0.55);
  display: block;
}