body {
    font-family: Arial, sans-serif;
    background: #f4f4f9;
    color: #333;
    margin: 0;
    padding: 20px;
}

.container {
    text-align: center;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    margin: auto;
}

button {
    background-color: #007BFF;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
}

button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.quality-control {
    margin: 12px 0;
    text-align: left;
}

.quality-control label {
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
    font-weight: bold;
}

.quality-control input[type="range"] {
    width: 100%;
    accent-color: #007BFF;
    cursor: pointer;
}

.progress-bar {
    width: 100%;
    background: #ddd;
    height: 15px;
    border-radius: 8px;
    overflow: hidden;
    margin-top: 10px;
}

.progress-bar div {
    height: 100%;
    width: 0%;
    background: #007BFF;
    transition: width 0.3s;
}