.rss-feed .card-img-top {
    aspect-ratio: 16 / 9;
    height: auto;
    object-fit: cover;
    width: 100%;
}

/**
 * Filter navigation for MPC RSS.
 * Appearance adapts to the active grouping mode via [data-grouping-mode].
 */
.rss-categories {
    margin-bottom: 1.5rem;
}

.rss-categories h2 {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Mode-specific styling */
.rss-categories ul[data-grouping-mode="category"] .nav-link {
    border-left: 3px solid transparent;
}

.rss-categories ul[data-grouping-mode="category"] .nav-link.active {
    border-left-color: #0d6efd;
}

.rss-categories ul[data-grouping-mode="source"] .nav-link {
    font-weight: 500;
}

.rss-categories ul[data-grouping-mode="date"] .nav-link {
    min-width: 120px;
    text-align: center;
}

/* Responsive adjustments */
@media (width <= 768px) {
    .rss-categories ul {
        gap: 0.5rem !important;
    }

    .rss-categories .nav-link {
        font-size: 0.875rem;
        padding: 0.5rem 0.75rem;
    }

    .rss-categories ul[data-grouping-mode="date"] .nav-link {
        min-width: auto;
    }
}

/* Active state enhancements */
.rss-categories .nav-link.active {
    font-weight: 600;
}

/* Keyboard focus visibility (independent of theme) */
.rss-feed a:focus-visible,
.rss-categories .nav-link:focus-visible,
.rss-pagination .page-link:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}