body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(to bottom, #4e8bff, #0099ff);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background: #f0f0f0;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 10px 10px 20px rgba(0, 0, 0, 0.1),
        -10px -10px 20px rgba(255, 255, 255, 0.5);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

form {
    margin-bottom: 20px;
}

label {
    font-weight: bold;
    margin-right: 10px;
    color: #333;
}

select,
input[type="file"] {
    margin-right: 10px;
    border-radius: 5px;
    border: none;
    padding: 5px 10px;
    background-color: rgba(255, 255, 255, 0.8);
    color: #333;
    box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.1),
        inset -5px -5px 10px rgba(255, 255, 255, 0.5);
    user-select: none;
    cursor: grab;
    outline: none;
}

button {
    padding: 8px 20px;
    border-radius: 5px;
    border: none;
    background-color: #0099ff;
    color: #fff;
    cursor: pointer;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1),
        -5px -5px 10px rgba(255, 255, 255, 0.5);
}

#progress {
    display: none;
    text-align: center;
    margin-bottom: 20px;
}

#progressBar {
    width: 100%;
}

#results {
    display: none;
    margin-top: 20px;
}

#results h2 {
    text-align: center;
    color: #333;
}

#fileList {
    list-style-type: none;
    padding: 0;
}

#downloadButton {
    padding: 8px 20px;
    border-radius: 5px;
    border: none;
    background-color: #0099ff;
    color: #fff;
    cursor: pointer;
    box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1),
        -5px -5px 10px rgba(255, 255, 255, 0.5);
}