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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    text-align: center;
    max-width: 700px;
    width: 100%;
}

.card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 60px 40px;
    margin-bottom: 30px;
}

.title {
    font-size: 4rem;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 20px;
}

.subtitle {
    font-size: 1.5rem;
    color: #4a5568;
    margin-bottom: 40px;
}

.checklist {
    background: linear-gradient(135deg, #ebf4ff 0%, #f3e8ff 100%);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
}

.check-item {
    font-size: 1.1rem;
    color: #2d3748;
    margin: 15px 0;
    font-weight: 500;
}

.info {
    border-top: 2px solid #e2e8f0;
    padding-top: 25px;
}

.version,
.date,
.copyright {
    font-size: 0.9rem;
    color: #718096;
    margin: 8px 0;
}

.footer-message {
    color: white;
    font-size: 0.95rem;
    opacity: 0.9;
    margin-top: 20px;
}

/* Animación */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.8s ease-out;
}

/* Responsive */
@media (max-width: 600px) {
    .title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.2rem;
    }
    
    .card {
        padding: 40px 25px;
    }
}