body {
    margin: 0;
    background-color: #1a1a1a;
    color: #ffffff;
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

h1 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.container {
    position: relative;
    width: 960px;
    height: 540px;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

video, canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: scaleX(-1); /* ミラー表示 */
}

#ui-layer {
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 24px;
    font-weight: bold;
    background: rgba(0, 0, 0, 0.7);
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid #444;
    z-index: 10;
}