body { margin:0; font-family:Arial; }
header {
    position:sticky; top:0;
    background:#0A1E3C; color:white;
    padding:15px 40px;
    display:flex; justify-content:space-between;
}
nav a { color:white; margin-left:20px; text-decoration:none; }

.hero {
    text-align:center;
    padding:100px 20px;
    background:linear-gradient(135deg,#0A1E3C,#1F4E79);
    color:white;
}

.section { padding:60px 20px; text-align:center; }

.grid {
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:20px;
}

.card {
    background:white; padding:20px;
    border-radius:10px;
    box-shadow:0 4px 10px rgba(0,0,0,0.2);
}

.footer {
    background:#1F4E79;
    text-align:center;
    padding:15px;
    color:white;
}

.whatsapp {
    position:fixed;
    bottom:20px;
    right:20px;
    background:#25D366;
    padding:15px;
    border-radius:50%;
    color:white;
}