body {
      background: #181818;
      color: #f2f2f2;
      font-family: 'Segoe UI', 'Arial', sans-serif;
      margin: 0; padding: 0;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
    }
h1 {
    margin-top: 24px;
    font-size: 1.4em;
}
#video-container {
    position: relative;
    width: 90vw;
    max-width: 420px;
    margin: 24px 0 16px 0;
    aspect-ratio: 4/3;
    border-radius: 22px;
    box-shadow: 0 4px 32px #000a;
    overflow: hidden;
    border: 1px solid #333;
    background: #222;
}
video, #overlay, #center-dot {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover;
}
#overlay {
    background: rgba(0,0,0,0.55);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 2;
}
#overlay.active {
    opacity: 1;
}
#center-dot {
    pointer-events: none;
    z-index: 3;
}
#controls {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}
#toggleOverlayBtn {
    padding: 5px 18px;
    background: #222;
    color: #fff;
    border: 1px solid #666;
    border-radius: 7px;
    font-size: 1em;
    cursor: pointer;
    transition: background 0.2s;
}
#toggleOverlayBtn.active {
    background: #444;
    color: #eee;
    border-color: #999;
}
#color-info {
    margin: 0 0 16px 0;
    display: flex; gap: 15px;
    align-items: center;
    font-size: 1.15em;
    letter-spacing: 0.02em;
}
.color-sample {
    width: 36px; height: 36px;
    border: 2px solid #fff9;
    border-radius: 8px;
    margin-right: 12px;
    display: inline-block;
    vertical-align: middle;
    background: #fff;
}
@media (max-width: 540px) {
    h1 { font-size: 1em; }
    #video-container { width: 98vw; }
    #controls { flex-direction: column; gap: 8px; }
    #toggleOverlayBtn { font-size: 0.98em; }
}