body {
    font-family: system-ui, sans-serif;
    line-height: 1.6;
    background: #f9f9f9;
    color: #333;
}  
/* ─────────────────────────────────────────────────────────
     2) Navbar
  ───────────────────────────────────────────────────────── */
#navbar {
    position: sticky;
    top: 0;
    display: flex;
    justify-content: center;
    gap: 1rem;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(6px);
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 100;
}
#navbar a {
    text-decoration: none;
    padding: .5rem;
    transition: color .3s;
}
#navbar a:hover,
#navbar a.active {
    color: #0070f3;
    font-weight: 600;
}