.progressive-media-shell {
    position: relative;
    display: block;
    width: 100%;
    max-width: 100%;
    margin: 20px auto;
    box-sizing: border-box;
}

.progressive-media-shell[aria-busy="true"] {
    cursor: progress;
}

.progressive-media-shell [hidden] {
    display: none !important;
}

.progressive-media-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    min-height: 112px;
    padding: 20px;
    border: 1px solid var(--color-border, #e5e7eb);
    border-radius: 8px;
    background:
        linear-gradient(100deg, rgba(241, 245, 249, 0.82) 20%, rgba(255, 255, 255, 0.94) 38%, rgba(241, 245, 249, 0.82) 56%);
    background-size: 220% 100%;
    color: var(--color-text-muted, #64748b);
    font-size: 0.88rem;
    line-height: 1.4;
    animation: progressive-media-sheen 1.8s ease-in-out infinite;
}

/* With JavaScript disabled the <noscript> player is already usable, so do not
   leave a permanent "Loading..." card above it. */
html:not(.js-enabled) .progressive-media-status {
    display: none;
}

.progressive-media-video-shell .progressive-media-status {
    min-height: min(52vw, 420px);
    aspect-ratio: 16 / 9;
}

.progressive-media-audio-shell .progressive-media-status {
    min-height: 82px;
    padding: 14px;
    border: 0;
    background: transparent;
    animation: none;
}

.progressive-media-spinner {
    flex: 0 0 auto;
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e1;
    border-top-color: var(--color-accent, #2563eb);
    border-radius: 50%;
    animation: progressive-media-spin 0.75s linear infinite;
}

.progressive-media-status-text {
    min-width: 0;
}

.progressive-media-shell[data-media-state="ready"] {
    cursor: default;
}

.progressive-media-shell > .lesson-media {
    max-width: 100%;
    margin: 0 auto;
}

.progressive-media-image-shell:not(.progressive-media-sized) > .lesson-image {
    width: auto;
}

.progressive-media-sized > .lesson-image,
.progressive-media-shell > .lesson-video {
    width: 100%;
}

.progressive-media-shell > .lesson-video {
    height: auto;
    margin: 0;
}

.progressive-media-audio-shell.lesson-audio-player {
    margin: 20px auto;
}

.progressive-media-audio-shell .lesson-audio-player-controls {
    width: 100%;
}

.progressive-media-audio-shell .lesson-audio {
    width: 100%;
}

.progressive-media-shell[data-media-state="error"] .progressive-media-status {
    cursor: default;
    min-height: 94px;
    border-color: #fca5a5;
    background: #fff7f7;
    color: #991b1b;
    animation: none;
}

.progressive-media-audio-shell[data-media-state="error"] {
    border-color: #fca5a5;
    background: #fff7f7;
}

.progressive-media-error-icon {
    display: inline-grid;
    place-items: center;
    flex: 0 0 auto;
    width: 23px;
    height: 23px;
    border: 1px solid #ef4444;
    border-radius: 50%;
    font-weight: 750;
    line-height: 1;
}

.progressive-media-retry {
    flex: 0 0 auto;
    padding: 6px 11px;
    border: 1px solid #ef4444;
    border-radius: 6px;
    background: #fff;
    color: #991b1b;
    font: inherit;
    font-weight: 650;
    cursor: pointer;
}

.progressive-media-retry:hover,
.progressive-media-retry:focus-visible {
    background: #fee2e2;
    outline: 2px solid transparent;
}

@keyframes progressive-media-spin {
    to { transform: rotate(360deg); }
}

@keyframes progressive-media-sheen {
    0% { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

@media (prefers-reduced-motion: reduce) {
    .progressive-media-status,
    .progressive-media-spinner {
        animation: none;
    }
}

@media (max-width: 600px) {
    .progressive-media-status {
        min-height: 92px;
        padding: 14px;
    }

    .progressive-media-video-shell .progressive-media-status {
        min-height: 160px;
    }

    .progressive-media-shell[data-media-state="error"] .progressive-media-status {
        align-items: flex-start;
        flex-wrap: wrap;
        justify-content: flex-start;
    }
}