/* ===== Styled Navigation Menu ===== */
.if-subnav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    padding: 0.75rem 1.5rem;
    background: #000;
    /* mismo fondo que el resto de la web */
    z-index: 10000;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.if-subnav a {
    color: #ffffff;
    text-decoration: none;
    opacity: 0.85;
    transition: opacity 0.2s ease, color 0.2s ease;
    font-weight: 500;
}

.if-subnav a:hover {
    opacity: 1;
    color: #c59dff;
    /* púrpura suave para hover, acorde a QRBooks */
}

/* Espaciado para el body para compensar el menú fixed */
body {
    padding-top: 56px;
}

@media (max-width: 768px) {
    .if-subnav {
        justify-content: flex-start;
        overflow-x: auto;
        white-space: nowrap;
        gap: 1rem;
        padding: 0.75rem 1rem;
        scrollbar-width: none;
        /* Firefox */
    }

    .if-subnav::-webkit-scrollbar {
        display: none;
        /* Safari/Chrome */
    }

    body {
        padding-top: 48px;
    }
}