* {
    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;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 800px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    color: #333;
    font-size: 32px;
    margin-bottom: 10px;
}

.header p {
    color: #666;
    font-size: 16px;
}

.tab-container {
    display: flex;
    margin-bottom: 30px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.tab {
    flex: 1;
    padding: 15px;
    background: #f8f9fa;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.form-group {
    margin-bottom: 25px;
}

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

input[type="text"], textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

input[type="text"]:focus, textarea:focus {
    outline: none;
    border-color: #667eea;
}

textarea {
    height: 120px;
    resize: vertical;
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    width: 100%;
    margin-bottom: 15px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #6c757d;
}

.btn-success {
    background: #28a745;
}

.btn-danger {
    background: #dc3545;
}

.result {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    border-left: 4px solid #28a745;
    display: none;
}

.result.error {
    border-left-color: #dc3545;
    background: #f8d7da;
    color: #721c24;
}

.license-code {
    background: #e9ecef;
    padding: 15px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    word-break: break-all;
    margin: 10px 0;
    border: 1px solid #dee2e6;
    font-size: 14px;
}

.copy-btn {
    background: #28a745;
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    margin-top: 10px;
}

.copy-btn:hover {
    background: #218838;
}

.status {
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
    font-weight: 600;
}

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

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

.status.warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.info-box {
    background: #d1ecf1;
    border: 1px solid #bee5eb;
    border-radius: 8px;
    padding: 15px;
    margin: 20px 0;
    color: #0c5460;
}

.footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e1e5e9;
    color: #666;
    font-size: 14px;
}

.hidden {
    display: none;
}

.input-group {
    position: relative;
}

.input-group .btn {
    position: absolute;
    right: 5px;
    top: 5px;
    bottom: 5px;
    width: auto;
    padding: 0 15px;
    margin: 0;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin: 10px;
    }
    
    .header h1 {
        font-size: 24px;
    }
    
    .tab-container {
        flex-direction: column;
    }
}