.groupon-coupon-validator {
    max-width: 500px;
    margin: 20px 0;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background: #f9f9f9;
}

.groupon-coupon-validator h3 {
    margin-top: 0;
    color: #333;
}

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

.groupon-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

.groupon-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 3px;
    font-size: 16px;
    box-sizing: border-box;
}

.groupon-button {
    background: #0073aa;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 16px;
}

.groupon-button:hover {
    background: #005177;
}

.groupon-result {
    margin-top: 15px;
    padding: 10px;
    border-radius: 3px;
}

.groupon-result .success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.groupon-result .error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.groupon-result .loading {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
    text-align: center;
    font-style: italic;
}