* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px 20px;
    text-align: center;
}

.header h1 {
    font-size: 32px;
    margin-bottom: 8px;
}

.header p {
    font-size: 16px;
    opacity: 0.9;
}

.content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    padding: 30px;
}

.input-section, .output-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

label {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    display: block;
}

textarea {
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    font-family: 'Courier New', monospace;
    resize: vertical;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: #667eea;
}

.button-group {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    flex: 1;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #f0f0f0;
    color: #333;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.btn-success {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
    width: 100%;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(76, 175, 80, 0.3);
}

.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.option-group {
    display: flex;
    flex-direction: column;
}

.option-group select {
    padding: 10px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.3s;
}

.option-group select:focus {
    outline: none;
    border-color: #667eea;
}

.qr-preview {
    background: #f8f9fa;
    border: 2px dashed #e0e0e0;
    border-radius: 8px;
    padding: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

#qrcodeContainer {
    display: flex;
    align-items: center;
    justify-content: center;
}

#qrcodeContainer canvas {
    max-width: 100%;
    border-radius: 8px;
    background: white;
    padding: 10px;
    border: 1px solid #e0e0e0;
}

.download-section {
    display: flex;
    gap: 10px;
}

.info-section {
    background: #f0f7ff;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.info-section p {
    font-size: 14px;
    color: #333;
    margin-bottom: 8px;
}

.info-section p strong {
    color: #667eea;
}

.examples {
    padding: 20px 30px;
    background: #f8f9fa;
    border-top: 1px solid #e0e0e0;
}

.examples h3 {
    font-size: 14px;
    color: #666;
    margin-bottom: 12px;
}

.examples button {
    margin-right: 8px;
    margin-bottom: 8px;
    padding: 8px 12px;
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s;
}

.examples button:hover {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.footer {
    padding: 15px;
    text-align: center;
    background: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    color: #666;
    font-size: 12px;
}

@media (max-width: 768px) {
    .content {
        grid-template-columns: 1fr;
    }

    .options {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .header h1 {
        font-size: 24px;
    }
}