* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; background: #05070f; color: #e8ecf1; font-family: system-ui, sans-serif; display: flex; flex-direction: column; align-items: center; justify-content: center; }
canvas { width: min(480px, 96vw); height: auto; border: 2px solid #1a1f2e; border-radius: 8px; box-shadow: 0 0 24px rgba(0,200,255,0.15); background: #0a0e1a; display: block; }