nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--input-bg);
    color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: relative; 
    overflow: hidden; 
}

nav::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 350px; 
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    transform: translateX(-150px); 
    animation: scanLine 8s linear infinite;
}

@keyframes scanLine {
    0% {
        transform: translateX(-150px);
    }
    100% {
        transform: translateX(100vw);
    }
}

nav .nav-links {
    display: flex;
    gap: 1rem;
}

nav .nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    position: relative;
    padding: 4px 0;
    transition: color 0.3s ease; 
}

nav .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(99, 122, 250, 0.4), transparent);
    transform: scaleX(0);
    opacity: 0;
    transform-origin: center;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}

nav .nav-links a:hover {
    color: var(--accent);
}

nav .nav-links a:hover::after {
    transform: scaleX(1);
    opacity: 1;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    nav {
        padding: 1rem 1.5rem;
        display: flex;
        flex-direction: row; 
        justify-content: space-between;
        align-items: center;
        overflow: visible;
    }

    .menu-toggle {
        display: block;
    }

    nav .nav-links {
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 2rem 0;
        text-align: center;
        z-index: 999;

        background-color: rgba(12, 13, 15, 0.75); 
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);

        border-bottom: 2px solid var(--accent);
        box-shadow: 0 10px 20px rgba(0,0,0,0.3);
        opacity: 0;
        transform: translateY(-20px);
        pointer-events: none;
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
    }

    nav .nav-links.active {
        opacity: 1;
        transform: translateY(0);
        pointer-events: all;
    }

    nav .nav-links a {
        display: inline-block;
        font-size: 1.2rem;
        width: auto;
    }
    
    nav::after {
        display: none; 
    }
}