* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #0F0F23; }
body { display: flex; align-items: center; justify-content: center; font-family: "Helvetica Neue", Arial, sans-serif; }
#game-container { width: 100vw; height: 100vh; display: flex; align-items: center; justify-content: center; }
#game-container canvas { display: block; max-width: 100%; max-height: 100%; }