.navbar {
    background: rgba(5, 5, 17, 0.85); /* Glassmorphism Dark */
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: background 0.3s, border-color 0.3s;
}

[data-bs-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.9); /* Glassmorphism Light */
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar-brand { font-size: 1.5rem; letter-spacing: 1px; }

.nav-link { position: relative; margin: 0 8px; transition: color 0.3s; }
.nav-link.active::after {
    content: ''; position: absolute; bottom: 5px; left: 0; width: 100%; height: 2px;
    background: var(--primary-color); border-radius: 2px;
}