body {
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0078D4, #002050);
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    max-width: 600px;
    width: 90%;
}

.logo {
    width: 100px;
    height: 100px;
    display: block;
    margin: 0 auto 1rem;
}

h1 {
    text-align: center;
    color: #0078D4;
    margin-bottom: 2rem;
}

.version-select {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

label {
    font-weight: 500;
    color: #333;
}

select {
    padding: 0.5rem;
    border: 2px solid #0078D4;
    border-radius: 5px;
    font-size: 1rem;
}

.generate-btn {
    width: 100%;
    padding: 1rem;
    background: #0078D4;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.generate-btn:hover {
    background: #005a9e;
}

.result {
    margin-top: 2rem;
    text-align: center;
}

.key-display {
    background: #f5f5f5;
    padding: 1rem;
    border-radius: 5px;
    font-family: monospace;
    font-size: 1.2rem;
    margin: 1rem 0;
    user-select: all;
}

.copy-btn {
    padding: 0.5rem 1rem;
    background: #333;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.copy-btn:hover {
    background: #555;
}

.disclaimer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.8rem;
    color: #666;
}

@keyframes highlight {
    0% { background: #ffeb3b; }
    100% { background: #f5f5f5; }
}

.highlight {
    animation: highlight 1s;
}