body {
    font-family: Arial, sans-serif;
    background-color: #f2f2f2;
    display: flex;
    justify-content: center;
    padding: 50px;
}

.container {
    background-color: white;
    padding: 2em;
    border-radius: 12px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
    width: 500px;
    text-align: center;
}

#drop-area {
    border: 2px dashed #aaa;
    padding: 30px;
    margin-bottom: 20px;
    border-radius: 10px;
    cursor: pointer;
    background-color: #fafafa;
}

#drop-area.hover {
    background-color: #e0ffe0;
}

ul#file-list {
    list-style: none;
    padding: 0;
}

#file-list li {
    padding: 8px;
    margin: 4px 0;
    background: #eee;
    border-radius: 5px;
    cursor: grab;
}

button {
    margin-top: 20px;
    padding: 10px 25px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
}

#loader {
    margin-top: 15px;
    font-weight: bold;
    color: #333;
}