.youtube-lesson { margin: 16px 0; padding: 14px 0; border-block: 1px solid #b9cbc4; min-width: 0; }
.youtube-lesson summary { cursor: pointer; font-weight: 700; }
.youtube-link-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 12px; }
.youtube-link-row input { flex: 1 1 200px; min-width: 0; padding: 10px; min-height: 44px; box-sizing: border-box; border: 1px solid #b9cbc4; border-radius: 3px; }
.youtube-link-row button { min-height: 44px; }
.youtube-player:empty { display: none; }
.youtube-player iframe { display: block; width: 100%; min-height: 200px; aspect-ratio: 16 / 9; height: auto; border: 0; margin: 12px 0; }
.youtube-lesson input[type="file"] { max-width: 100%; margin: 8px 0 12px; }
.youtube-caption-preview { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 15px; line-height: 1.6; }
.youtube-caption-preview:empty { display: none; }