body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

main {
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.qr-container {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 20px;
    margin: 20px 0;
}

.input-section, .output-section {
    flex: 1;
    min-width: 300px;
    background-color: white;
    border-radius: 5px;
    padding: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.input-section h2, .output-section h2 {
    margin-top: 0;
    color: #444;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}

textarea#qrContent {
    width: 100%;
    height: 100px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 14px;
    resize: vertical;
    box-sizing: border-box;
}

select, input[type="color"] {
    width: 100%;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ddd;
    box-sizing: border-box;
}

input[type="color"] {
    height: 40px;
    cursor: pointer;
}

.button-group {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.action-button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s;
}

.action-button:hover {
    background-color: #0056b3;
}

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

.action-button.secondary {
    background-color: #6c757d;
}

.action-button.secondary:hover {
    background-color: #5a6268;
}

#qrCodeContainer {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    background-color: #f9f9f9;
    border: 1px dashed #ddd;
    border-radius: 4px;
    margin-bottom: 20px;
}

#qrPlaceholder {
    color: #999;
    text-align: center;
    padding: 20px;
}

#qrImage {
    max-width: 100%;
    padding: 10px;
}

.info-section {
    background-color: white;
    border-radius: 5px;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.info-section h2 {
    color: #333;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

.info-section h3 {
    color: #444;
    margin-top: 20px;
}

.info-section ul, .info-section ol {
    padding-left: 20px;
}

.info-section li {
    margin-bottom: 8px;
}

.note {
    background-color: #f8f9fa;
    border-left: 4px solid #007bff;
    padding: 15px;
    margin-top: 20px;
    border-radius: 0 4px 4px 0;
}

.note h4 {
    margin-top: 0;
    color: #007bff;
}

/* Ad Container Styling */
.ad-container {
    width: 100%;
    max-width: 800px;
    margin: 20px auto;
    padding: 15px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    overflow: hidden;
    min-height: 100px;
}

.ad-bottom {
    margin-top: 30px;
    background-color: #f9f9f9;
    border-top: 3px solid #007bff;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: #333;
    color: #fff;
    margin-top: 30px;
}

footer a {
    color: #fff;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .qr-container {
        flex-direction: column;
    }
    
    .button-group {
        justify-content: center;
    }
}