.main-navigation {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 999;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    padding: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    display: flex;
    gap: 4px;
}

.nav-item {
    padding: 12px 24px;
    border-radius: 20px;
    cursor: pointer;
    font-family: "Exo 2", sans-serif;
    font-weight: 600;
    font-size: 0.95em;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    position: relative;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    border: none;
    background: transparent;
}

.nav-item:hover {
    color: var(--primary-color);
    background: rgba(0, 102, 204, 0.1);
}

.nav-item.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 10px rgba(0, 102, 204, 0.3);
}

.nav-item .series-number {
    font-family: "Orbitron", sans-serif;
    font-weight: 700;
    font-size: 1.1em;
}

.nav-item .series-desc {
    font-size: 0.8em;
    opacity: 0.8;
    margin-left: 4px;
}

.nav-divider {
    width: 1px;
    background: var(--border-color);
    margin: 8px 0;
}

@media (max-width: 768px) {
    .main-navigation {
        top: 10px;
        left: 50%;
        transform: translateX(-50%);
        padding: 6px;
        border-radius: 20px;
        max-width: calc(100vw - 40px);
    }

    .nav-item {
        padding: 10px 16px;
        font-size: 0.85em;
        flex: 1;
        text-align: center;
    }

    .nav-item .series-desc {
        display: none;
    }

    .nav-divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .main-navigation {
        max-width: calc(100vw - 20px);
        padding: 4px;
    }

    .nav-item {
        padding: 8px 12px;
        font-size: 0.8em;
    }
}