.isbn-barcode-container {
    max-width: 500px;
    margin: 20px auto;
    padding: 20px;
    background: #f8f8f8;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.isbn-barcode-form .form-group {
    display: flex;
    margin-bottom: 15px;
}

.isbn-barcode-form input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    font-size: 16px;
}

.isbn-barcode-form button {
    padding: 10px 15px;
    background: #0073aa;
    color: white;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background 0.3s;
}

.isbn-barcode-form button:hover {
    background: #005177;
}

.isbn-barcode-form button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.error-message {
    color: #d32f2f;
    margin-bottom: 15px;
    font-size: 14px;
    display: none;
}

.barcode-result {
    margin-top: 20px;
    text-align: center;
}

.barcode-image-container {
    padding: 15px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 15px;
}

.barcode-image-container img {
    max-width: 100%;
    height: auto;
}

.download-button {
    display: inline-block;
    padding: 10px 20px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    transition: background 0.3s;
}

.download-button:hover {
    background: #388E3C;
}