header {
    position: fixed;
    top: 2rem; 
    left: 50%;
    transform: translateX(-50%); 
    z-index: 1000;
    width: auto; 
    animation: floatIn 0.6s ease-out;
}

.navbar {
    background: rgba(10, 10, 10, 0.9); 
    backdrop-filter: blur(20px); 
    border: 1px solid rgba(0, 255, 136, 0.2); 
    border-radius: 50px; 
    padding: 0.8rem 2rem; 
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3); 
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    justify-content: center;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.6rem 1.2rem; 
    border-radius: 25px; 
    font-size: 0.95rem;
    white-space: nowrap; 
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(0, 255, 136, 0.1);
    transform: translateY(-1px); 
}

.nav-link.active {
    color: var(--primary-color);
    background: rgba(0, 255, 136, 0.15);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.2); 
}

@keyframes floatIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

@media (max-width: 768px) {
    header {
        top: 1rem;
        left: 50%;
        transform: translateX(-50%);
        width: 98vw;
        min-width: unset;
        max-width: 100vw;
    }

    .navbar {
        padding: 0.6rem 0.5rem;
        border-radius: 40px;
        max-width: 100vw;
        overflow-x: auto;
    }

    .nav-menu {
        gap: 0.2rem;
        flex-wrap: nowrap;
        overflow-x: auto;
        max-width: 100vw;
        padding-bottom: 2px;
        scrollbar-width: thin;
    }

    .nav-link {
        padding: 0.5rem 0.8rem;
        font-size: 0.9rem;
        min-width: max-content;
    }
}

@media (max-width: 480px) {
    header {
        top: 0.5rem;
        width: 99vw;
        max-width: 99vw;
    }

    .navbar {
        padding: 0.4rem 0.2rem;
        border-radius: 24px;
    }

    .nav-menu {
        gap: 0.1rem;
        padding-bottom: 2px;
    }

    .nav-link {
        padding: 0.35rem 0.6rem;
        font-size: 0.82rem;
    }
}