header {
position: sticky; /* Or use "fixed" if you want it to always stay visible */
top: 0;
left: 0;
width: 100%;
background: #242420; /* solid, rich dark color (match your theme) */
z-index: 100;
box-shadow: 0 4px 18px #0002;
transition: background 0.3s;
}
/* Optional: Add some padding to main so content isn't hidden under sticky header */
main {
padding-top: 130px; /* Adjust if header is taller/shorter */
}
