body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.container {
    width: 80%;
    margin: 50px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #007bff;
    text-align: center;
}

form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

input[type="file"] {
    padding: 10px;
    border-radius: 4px;
    border: 1px solid #ccc;
    margin-top: 10px;
}

button {
    padding: 15px;
    border: none;
    border-radius: 4px;
    background-color: #007bff;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.loading {
    display: none;
    text-align: center;
}

.loading img {
    width: 50px;
}

.file-list {
    margin-top: 10px;
    list-style-type: none;
}

.file-list li {
    background: #f0f0f0;
    margin: 5px 0;
    padding: 10px;
    border-radius: 4px;
}