body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 600px;
    width: 100%;
    text-align: center;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.back-btn {
    text-decoration: none;
    color: #317EFB;
    font-weight: bold;
    font-size: 16px;
}

h1 {
    font-size: 24px;
    margin: 0;
}

p {
    color: #666;
}

.drop-zone {
    border: 2px dashed #317EFB;
    padding: 20px;
    margin: 20px 0;
    cursor: pointer;
}

.drop-zone.dragover {
    background-color: #e1f0ff;
}

.progress {
    margin: 20px 0;
}

progress {
    width: 100%;
    height: 10px;
}

.convert-btn {
    background-color: #317EFB;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.convert-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.download-link {
    display: block;
    margin: 20px 0;
    color: #317EFB;
    text-decoration: none;
    font-weight: bold;
}

.status {
    color: #333;
}

.hidden {
    display: none;
}

@media (max-width: 600px) {
    .container {
        margin: 10px;
        padding: 15px;
    }

    h1 {
        font-size: 20px;
    }

    .convert-btn {
        width: 100%;
    }
}