body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    background: #111;
    color: #fff;
    font-family: Arial, sans-serif;
}
#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
}
#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    background: #222;
}
#ui {
    position: absolute;
    top: 10px;
    left: 10px;
    color: #fff;
    pointer-events: none;
}
.player-info {
    margin: 5px 0;
}
#message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.7);
    padding: 10px 20px;
    border-radius: 5px;
    text-align: center;
    max-width: 80%;
}