.gpk-form-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.gpk-form-group {
    margin-bottom: 15px;
}

.gpk-form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #333;
}

.gpk-form-group input[type="file"],
.gpk-form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-family: inherit;
}

.gpk-submit-button {
    padding: 10px 20px;
    background-color: #0073aa;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.gpk-submit-button:hover {
    background-color: #005177;
}

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

.gpk-success-message {
    padding: 10px;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    border-radius: 4px;
    margin-bottom: 15px;
}