body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
            margin: 0;
            padding: 20px;
        }
        #drop-zone {
            width: 300px;
            height: 200px;
            border: 2px dashed #ccc;
            border-radius: 20px;
            text-align: center;
            padding: 20px;
            margin: 20px auto;
            background-color: #fff;
            transition: background-color 0.3s ease;
        }
        #drop-zone:hover {
            background-color: #e1e1e1;
        }
        #video-container {
            max-width: 1000px;
            margin: 0 auto;
            background-color: #fff;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        #video-list {
            list-style-type: none;
            padding: 0;
        }
        #video-list li {
            cursor: pointer;
            padding: 10px;
            background-color: #f9f9f9;
            margin: 5px 0;
            border-radius: 5px;
            transition: background-color 0.3s ease;
        }
        #video-list li:hover {
            background-color: #e1e1e1;
        }
        .group-item {
            margin-left: 20px;
            border-left: 2px solid #af4caa;
            padding-left: 10px;
        }
        .group-header {
            font-weight: bold;
            background-color: #e0e0e0;
            padding: 10px;
            border-radius: 5px;
            margin-top: 10px;
        }
        .group-header::before {
            content: '▼ ';
            color: #af4caa;
        }
        .group-header.expanded::before {
            content: '▲ ';
        }
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.8);
            backdrop-filter: blur(5px);
        }
        .modal-content {
            background-color: #2c2c2c;
            margin: 5% auto;
            padding: 30px;
            border: none;
            border-radius: 10px;
            width: 80%;
            height: 80%;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            color: #fff;
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: space-between;
        }
        .close {
            color: #aaa;
            position: absolute;
            top: 10px;
            right: 20px;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            transition: color 0.3s ease;
        }
        .close:hover {
            color: #fff;
        }
        #video-title {
            margin-bottom: 20px;
            font-size: 1.5em;
            font-weight: bold;
            text-align: center;
        }
        #modal-video-container {
            width: 60%;
            height: 60%;
            position: relative;
        }
        #modal-video {
            width: 100%;
            height: 100%;
            border-radius: 5px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        }
        #navigation-buttons {
            margin-top: 20px;
            text-align: center;
        }
        #navigation-buttons button {
            margin: 0 10px;
            padding: 10px 20px;
            background-color: #af4caa;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        #navigation-buttons button:hover {
            background-color: #9845a0;
        }
        .input-container {
            display: flex;
            align-items: center;
            margin: 20px auto;
            max-width: 400px;
            background-color: #fff;
            padding: 10px;
            border-radius: 5px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        .input-container label {
            flex: 1;
            font-size: 0.9em;
            color: #333;
            margin-right: 10px;
        }
        .input-container select,
        .input-container input[type="number"] {
            flex: 0 0 80px;
            padding: 5px;
            border: 1px solid #ccc;
            border-radius: 3px;
            font-size: 0.9em;
        }
        .input-container select:focus,
        .input-container input[type="number"]:focus {
            outline: none;
            border-color: #af4caa;
            box-shadow: 0 0 3px #af4caa;
        }
        .input-container input[type="checkbox"] {
            margin-left: 10px;
        }