body { background:#0d1423; scroll-behavior: smooth; }
.active-link { border-bottom: 2px solid #3b82f6; color: #3b82f6; }
.group:hover .preview-video { opacity: 1; }
.preview-loading { display: none; }
.preview-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.3s ease;
}
/* Hamburger Menu */
#menuBtn .bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: all 0.3s ease-in-out;
    background-color: white;
}
@media (max-width: 768px) {
    #navMenu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #0f172a;
        padding: 20px;
        border-bottom: 1px solid #1e293b;
    }
    #navMenu.active { display: flex; }
    #menuBtn.active .bar:nth-child(2) { opacity: 0; }
    #menuBtn.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    #menuBtn.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
}