/**
 * WCAG 2.1 focus, touch targets, CLS, and responsive grid helpers.
 * Non-destructive — additive rules only; preserves existing theme tokens.
 */

/* Keyboard focus — visible rings (AA/AAA friendly) */
:focus {
    outline: none;
}

:focus-visible {
    outline: 3px solid #0b57d0;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(11, 87, 208, 0.25);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="button"]:focus-visible,
.carousel-btn:focus-visible,
.db-pill:focus-visible,
.nav-link:focus-visible {
    outline: 3px solid #0b57d0;
    outline-offset: 2px;
}

/* Minimum touch targets (44×44px) */
.btn,
.carousel-btn,
.nav-link,
.db-pill,
.footer-nav a,
.pagination a,
.pagination button,
.topic-nav a,
.resource-card .card-link,
.hero-cta-btn {
    min-height: 44px;
    min-width: 44px;
}

.nav-socials a,
.footer-socials a {
    min-height: 2.25rem;
    min-width: 2.25rem;
}

.db-pill,
.nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0.85rem;
}

/* CLS: media aspect ratios and lazy below-fold images */
img:not([width]):not(.site-logo-mark) {
    max-width: 100%;
    height: auto;
}

img[loading="lazy"] {
    decoding: async;
}

.hero-logo-img,
.resource-card img,
.video-card img,
.carousel-card img {
    aspect-ratio: attr(width) / attr(height);
}

.video-card-thumb,
.resource-thumb {
    aspect-ratio: 16 / 9;
    object-fit: cover;
    width: 100%;
}

iframe[src*="youtube"],
iframe[src*="spotify"] {
    width: 100%;
    aspect-ratio: 16 / 9;
    min-height: 200px;
    border: 0;
}

/* Fluid grids without horizontal scroll */
.resource-grid,
.articles-grid,
.learning-paths-grid,
.events-grid,
.video-carousel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

body {
    overflow-x: hidden;
}

@media (max-width: 768px) {
    .resource-grid,
    .articles-grid,
    .learning-paths-grid,
    .events-grid,
    .video-carousel,
    .hero-wrap {
        grid-template-columns: 1fr;
    }

    .container {
        max-width: 100%;
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

/* Default aspect ratio for images missing explicit dimensions */
img[src*="ytimg.com"]:not([width]) {
    aspect-ratio: 16 / 9;
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* Screen-reader utility preserved */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}