/* spec.md に基づくスタイリング */
body {
    display: block;
    margin: 0;
    overflow: hidden;
    background-color: #111;
    font-family: sans-serif;
}

canvas {
    display: block;
    background-color: #222;
}

.controls {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 15px;
    background-color: rgba(0, 0, 0, 0.5);
    padding: 10px 20px;
    border-radius: 10px;
    color: white;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

button {
    padding: 5px 15px;
    font-size: 14px;
    cursor: pointer;
    background-color: #444;
    color: white;
    border: 1px solid #666;
    border-radius: 5px;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #555;
}

input[type=range] {
    cursor: pointer;
}