/* Jerarquía visual del menú y reproductor adaptable. */
.stage{min-width:0}
.player{width:100%}
.player iframe,.player video{position:absolute;inset:0;width:100%;height:100%;border:0;display:block;object-fit:contain;background:#000}
.class-button{font-weight:500}
.content-actions{display:flex;align-items:center;gap:1rem}
.player-fullscreen{position:absolute;z-index:15;right:12px;top:12px;width:48px;height:48px;padding:0;border-radius:50%;background:#111d;color:#fff;box-shadow:0 2px 10px #0008}.player-fullscreen:hover{background:#26343eee}.player-fullscreen span{position:absolute;width:11px;height:11px;border-color:currentColor;border-style:solid}.player-fullscreen span:nth-child(1){left:11px;top:11px;border-width:2px 0 0 2px}.player-fullscreen span:nth-child(2){right:11px;top:11px;border-width:2px 2px 0 0}.player-fullscreen span:nth-child(3){left:11px;bottom:11px;border-width:0 0 2px 2px}.player-fullscreen span:nth-child(4){right:11px;bottom:11px;border-width:0 2px 2px 0}.player-fullscreen.is-active span:nth-child(1){left:8px;top:8px;transform:rotate(180deg)}.player-fullscreen.is-active span:nth-child(2){right:8px;top:8px;transform:rotate(180deg)}.player-fullscreen.is-active span:nth-child(3){left:8px;bottom:8px;transform:rotate(180deg)}.player-fullscreen.is-active span:nth-child(4){right:8px;bottom:8px;transform:rotate(180deg)}
.player:fullscreen{width:100vw;height:100vh;max-width:none;aspect-ratio:auto;border-radius:0;background:#000}.player:fullscreen iframe,.player:fullscreen video{object-fit:contain}.player:fullscreen .wm{font-size:clamp(.72rem,1.4vw,1rem)}
.course-group{border-radius:10px;margin:.75rem 0;background:#fbfaf6;box-shadow:0 3px 14px #16232c08;transition:border-color .2s,box-shadow .2s}
.course-group[open]{border-color:#c8bea8;box-shadow:0 5px 18px #16232c0d}
.course-group summary{display:grid;grid-template-columns:minmax(0,1fr) auto auto;padding:1rem;font:600 1.05rem Newsreader,serif}
.course-group summary:hover{background:#f4f1e8}
.course-group summary::after{font:600 1.25rem Inter,sans-serif;line-height:1}
.course-group summary small{font:500 .64rem Inter,sans-serif;padding:.22rem .45rem;border-radius:999px;background:#ece8dd;white-space:nowrap}
.course-lessons{padding:.35rem .5rem .55rem;background:#fff}
.course-lessons .class-button{padding:.7rem .75rem;font-size:.8rem;font-weight:500}
@media(max-width:760px){
  .topbar{height:auto;min-height:64px;gap:.75rem}
  .topbar #who{max-width:48vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .sidebar{max-height:44vh;overflow:auto}
  .stage{width:100%;overflow:hidden}
  .player{width:100%;max-width:none;aspect-ratio:16/9;border-radius:8px}
  .session-row{align-items:flex-start}.content-actions{width:100%;justify-content:space-between}
  .player-fullscreen{right:8px;top:8px;width:44px;height:44px}
  .course-group summary{padding:.8rem;font-size:1rem}
  .course-group summary small{font-size:.6rem}
}