body {
            font-family: Arial, sans-serif;
            margin: 40px;
            background-color: #000000; /* Set background to black */
            color: #FFFFFF; /* Set text color to white */
        }
        h1 {
            text-align: center;
            margin-bottom: 40px;
            color: #FFFFFF; /* Set heading color to white */
        }
        #playlist {
            margin-bottom: 20px;
        }
        .track {
            display: flex;
            align-items: center;
            padding: 20px;
            background-color: #1a1a1a; /* Set track background to dark gray */
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(255,255,255,0.1); /* White box shadow for depth */
            margin-bottom: 15px;
        }
        .track.playing {
            background-color: #333333; /* Highlight playing track */
        }
        .track > div {
            margin-right: 15px;
        }
        .track-index {
            width: 30px;
            text-align: center;
            font-weight: bold;
        }
        .toggle-button, .move-up, .move-down, .delete-button {
            cursor: pointer;
            padding: 10px;
            margin-right: 5px;
            border: none;
            border-radius: 5px;
            font-size: 1em;
            transition: background-color 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .toggle-button {
            background-color: #28a745; /* Play button green */
            color: #ffffff;
            width: 80px; /* Fixed width to prevent layout shift */
            text-align: center;
            margin-right: 20px; /* Increased space between button and URI */
        }
        .toggle-button.paused {
            background-color: #dc3545; /* Stop button red */
        }
        .toggle-button:hover {
            opacity: 0.8;
        }
        .move-up, .move-down {
            background-color: #555555;
            color: #ffffff;
            width: 40px; /* Fixed width for consistency */
        }
        .move-up:hover, .move-down:hover {
            background-color: #777777;
        }
        .delete-button {
            background-color: #ff4d4d;
            color: #ffffff;
            width: 40px; /* Fixed width for consistency */
        }
        .delete-button:hover {
            background-color: #ff1a1a;
        }
        .track-details-container {
            display: flex;
            flex-direction: column;
            margin-right: 15px;
            flex: 1;
        }
        .uri-memo-container {
            display: flex;
            align-items: center;
            width: 100%;
            margin-bottom: 10px;
        }
        .uri-container, .memo-container {
            width: 100%;
            margin-right: 10px;
        }
        .uri-container input[type="text"], .memo-container input[type="text"] {
            width: 100%;
            padding: 8px;
            border: none;
            border-radius: 5px;
            background-color: #2c2c2c;
            color: #ffffff;
            box-sizing: border-box;
        }
        .uri-container input[type="text"]::placeholder, .memo-container input[type="text"]::placeholder {
            color: #aaaaaa;
        }
        .start-slider-container {
            display: flex;
            align-items: center;
            width: 100%;
        }
        .start-slider-container input[type="range"] {
            flex: 1;
            margin-right: 10px;
        }
        .start-position-display {
            font-size: 12px;
            text-align: right;
            width: 80px;
        }
        .add-track {
            padding: 15px 30px;
            font-size: 1.2em;
            background-color: #28a745; /* Green */
            color: #ffffff;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        .add-track:hover {
            background-color: #218838;
        }
        input[type="range"] {
            -webkit-appearance: none;
            width: 100%;
            height: 8px;
            border-radius: 5px;
            background: #555555; /* Slider track color */
            outline: none;
            opacity: 0.9;
            transition: opacity .2s;
        }
        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #FFFFFF; /* Slider thumb color */
            cursor: pointer;
            border: none;
        }
        input[type="range"]::-moz-range-thumb {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #FFFFFF; /* Slider thumb color */
            cursor: pointer;
            border: none;
        }
        input[type="range"]:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            background: #333333; /* Disabled slider track color */
        }
        .control-group {
            margin-top: 40px;
            padding: 20px;
            background-color: #1a1a1a; /* Set control group background to dark gray */
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(255,255,255,0.1); /* White box shadow for depth */
        }
        .control-group h2 {
            margin-top: 0;
            color: #FFFFFF; /* Set heading color to white */
        }
        .control-group p {
            color: #FFFFFF; /* Set text color to white */
            line-height: 1.6;
        }
        .control-group ul {
            color: #FFFFFF; /* Set list color to white */
            line-height: 1.6;
        }
        .control-group ul li {
            margin-bottom: 10px;
        }