.product-nav {
    background: #0f172a;
    color: #e2e8f0;
    border-bottom: 1px solid #1e293b;
    position: sticky;
    top: 0;
    z-index: 200;
}

.product-nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-height: 52px;
}

.product-nav-brand {
    font-size: 0.9rem;
    font-weight: 600;
    color: #94a3b8;
    text-decoration: none;
    white-space: nowrap;
    padding: 0.5rem 0.25rem;
    flex-shrink: 0;
}

.product-nav-brand:hover { color: #fff; }

.product-nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: center;
    overflow-x: visible;
    flex: 1;
    min-width: 0;
    padding-bottom: 2px;
}

.product-nav-empty {
    color: #94a3b8;
    font-size: 0.85rem;
    padding: 0.5rem;
}

.product-nav a.product-link {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 0 1rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    color: #cbd5e1;
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
    transition: background 0.15s, color 0.15s;
}

.product-nav a.product-link:hover {
    background: #1e293b;
    color: #fff;
}

.product-nav a.product-link.active {
    background: #1a56db;
    color: #fff;
    pointer-events: none;
}

@media (max-width: 768px) {
    .product-nav-inner {
        flex-wrap: wrap;
        min-height: auto;
        padding: 0.5rem 0.75rem;
    }

    .product-nav-links {
        width: 100%;
        flex-wrap: wrap;
        overflow-x: visible;
    }

    .product-nav a.product-link {
        min-height: 48px;
        font-size: 1rem;
    }
}