html, body {
    padding: 0;
    margin: 0;
    background-color: #121212;
    font-family: Arial, sans-serif;
    overflow: hidden;
}
#viewport {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
#gameCanvas {
    border: 2px solid #444;
    background-color: #121212;
}
/* Placeholder for keyboard buttons - will be added dynamically */
.keyboard-button {
    position: absolute;
    width: 50px;
    height: 50px;
    background-color: rgb(33, 63, 185);
    border: 1px solid #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    user-select: none;
}
.keyboard-button:hover {
    background-color: rgb(92, 63, 180);
}