:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400}body{margin:0;overflow:hidden;background-color:#222;color:#eee;font-family:Segoe UI,sendMessage,sans-serif}#app{width:100vw;height:100vh;position:relative}canvas{display:block}.screen{position:absolute;top:0;left:0;width:100%;height:100%;background:#000000d9;display:flex;flex-direction:column;justify-content:center;align-items:center;z-index:10}.screen.hidden{display:none}h1,h2{margin-bottom:2rem;text-transform:uppercase;letter-spacing:2px}.menu-item{margin:10px 0;padding:10px 20px;background:#444;border:2px solid #666;border-radius:4px;cursor:pointer;font-size:1.2rem;min-width:200px;text-align:center;-webkit-user-select:none;user-select:none;transition:background .2s,transform .1s}.menu-item:hover{background:#555;transform:scale(1.05)}.menu-item.active{background:#4caf50;border-color:#45a049}.control-row{display:flex;align-items:center;margin:10px 0;gap:15px}.control-label{min-width:150px;text-align:right}select{padding:8px;font-size:1rem;background:#333;color:#fff;border:1px solid #555;border-radius:4px}