.lecture-ai-disclosure {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 5;
    max-width: calc(100% - 24px);
    color: #171717;
    font: 14px/1.5 system-ui, sans-serif;
    letter-spacing: 0;
    cursor: auto;
}

/* Subtle label on the video: no box, small and translucent; it brightens on hover or focus. */
.lecture-ai-disclosure summary {
    display: flex;
    align-items: center;
    gap: 6px;
    width: fit-content;
    min-height: 32px;
    padding: 0 6px 0 2px;
    list-style: none;
    color: rgba(255, 255, 255, 0.6);
    font-size: 12px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
    opacity: 0.75;
    cursor: pointer;
    touch-action: manipulation;
    transition: opacity 0.2s ease;
}

.lecture-ai-disclosure summary:hover,
.lecture-ai-disclosure summary:focus-visible,
.lecture-ai-disclosure[open] summary { opacity: 1; }

.lecture-ai-disclosure summary::-webkit-details-marker { display: none; }
.lecture-ai-disclosure summary::after { content: '+'; color: rgba(255, 255, 255, 0.5); }
.lecture-ai-disclosure[open] summary::after { content: '-'; }
.lecture-ai-disclosure summary:focus-visible { outline: 2px solid rgba(147, 197, 253, 0.9); outline-offset: 2px; border-radius: 4px; }
.lecture-ai-disclosure summary img { display: block; flex: 0 0 27px; width: 27px; height: 18px; filter: invert(1); opacity: 0.6; }
.lecture-ai-disclosure summary span { font-weight: 500; }

/* After playback started: just the small mark, the label slides back in on hover or focus. */
.lecture-ai-disclosure--compact summary span {
    max-width: 0;
    overflow: hidden;
    white-space: nowrap;
    opacity: 0;
    transition: max-width 0.25s ease, opacity 0.2s ease;
}
.lecture-ai-disclosure--compact:not([open]) summary { gap: 0; opacity: 0.4; }
.lecture-ai-disclosure--compact:not([open]) summary::after { content: none; }
.lecture-ai-disclosure--compact summary img { width: 21px; height: 14px; flex-basis: 21px; transition: width 0.2s ease, height 0.2s ease; }
.lecture-ai-disclosure--compact summary:hover,
.lecture-ai-disclosure--compact summary:focus-visible,
.lecture-ai-disclosure--compact[open] summary { gap: 6px; opacity: 1; }
.lecture-ai-disclosure--compact summary:hover span,
.lecture-ai-disclosure--compact summary:focus-visible span,
.lecture-ai-disclosure--compact[open] summary span { max-width: 140px; opacity: 1; }

.lecture-ai-disclosure__info {
    width: 320px;
    max-width: 100%;
    max-height: max(64px, calc(100dvh - 130px));
    margin-top: 6px;
    padding: 12px;
    overflow: auto;
    background: #fff;
    border: 1px solid #717171;
    border-radius: 4px;
    box-shadow: 0 2px 8px #0004;
    overflow-wrap: anywhere;
}

.lecture-ai-disclosure__info p { margin: 8px 0 0; }

@media (max-width: 480px), (max-height: 320px) {
    .lecture-ai-disclosure { top: 6px; left: 6px; max-width: calc(100% - 12px); }
    .lecture-ai-disclosure summary span { display: none; }
}