/* Demo teaching videos: player box, public section, own-profile card, editor dialog. Tokens only, so dark mode follows. All selectors are vd- scoped.
   No entrance animations. Touch targets are at least 44px. */
.vd-sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* 16:9 player box */
.vd-box{position:relative;width:100%;max-width:100%;aspect-ratio:16/9;border-radius:16px;overflow:hidden;background:#0b1220;border:1px solid var(--line-card);min-width:0}
.vd-frame{position:absolute;inset:0;width:100%;height:100%;border:0;display:block}
.vd-play{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:transparent;cursor:pointer;display:block;color:#fff}
.vd-th{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.vd-play::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.05),rgba(0,0,0,.35))}
.vd-ico{position:absolute;left:50%;top:50%;z-index:1;width:64px;height:64px;margin:-32px 0 0 -32px;border-radius:50%;display:grid;place-items:center;background:rgba(15,118,110,.92);color:#fff;box-shadow:0 6px 20px rgba(0,0,0,.4)}
.vd-ico svg{width:30px;height:30px;margin-left:3px}
.vd-play:hover .vd-ico{background:rgba(15,118,110,1)}
.vd-play:focus-visible{outline:3px solid var(--primary);outline-offset:-3px}
.vd-nothumb .vd-play{background:linear-gradient(135deg,#0f3d3a,#0b1220)}

/* open on YouTube link */
.vd-yt{display:inline-flex;align-items:center;min-height:44px;padding:0 4px;color:var(--primary);font-weight:600;text-decoration:underline;text-underline-offset:3px}
.vd-yt:hover{text-decoration-thickness:2px}
.vd-yt:focus-visible{outline:3px solid var(--primary);outline-offset:2px;border-radius:6px}

/* public page and own card: stacked videos */
.vd-list{display:grid;gap:18px;margin:0;padding:0;list-style:none}
.vd-list>li{display:grid;gap:6px;min-width:0;max-width:720px}
.vd-cap{margin:0;font-weight:600;font-size:1rem;line-height:1.4;overflow-wrap:anywhere;color:var(--ink)}
.vd-meta{display:flex;flex-wrap:wrap;align-items:center;gap:4px 14px;min-width:0}
.vd-hid{display:inline-flex;align-items:center;min-height:32px;padding:0 12px;border-radius:99px;font-size:.88rem;font-weight:600;background:var(--tint-rose);color:#9f1239}
:root[data-theme="dark"] .vd-hid{color:#fda4af}

/* own profile card */
.vd-card .tp-ch{flex-wrap:wrap}
.vd-card.tp-reveal{animation:none}
.vd-empty{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin:0}
.vd-empty p{margin:0;color:var(--muted);flex:1 1 200px;min-width:0}
.vd-add{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 16px;border-radius:99px;border:1px solid var(--btn-line);background:var(--card);color:var(--primary);font-weight:600;font:inherit;font-weight:600;cursor:pointer}
.vd-add svg{width:18px;height:18px}
.vd-add:focus-visible{outline:3px solid var(--primary);outline-offset:2px}

/* help (question mark) button and the how-to panel */
.vd-help{flex:none;display:inline-grid;place-items:center;width:44px;height:44px;padding:0;border-radius:50%;border:1px solid var(--btn-line);background:var(--card);color:var(--primary);cursor:pointer}
.vd-help svg{width:22px;height:22px}
.vd-help[aria-expanded="true"]{background:var(--tint-soft)}
.vd-help:focus-visible{outline:3px solid var(--primary);outline-offset:2px}
.vd-howto{margin:0 0 14px;padding:14px 16px;border-radius:16px;background:var(--tint-soft);border:1px solid var(--line);min-width:0}
.vd-howto[hidden]{display:none}
.vd-howto h3{font-size:1rem;margin:0 0 8px}
.vd-howto ol,.vd-howto ul{margin:0 0 10px;padding-left:22px;display:grid;gap:6px;font-size:.95rem;line-height:1.55}
.vd-howto li{overflow-wrap:anywhere}
.vd-howto p{margin:0 0 8px;font-size:.95rem}
.vd-howto .vd-tips{margin-bottom:0}

/* editor dialog */
.vd-ed{display:grid;gap:14px;min-width:0}
.vd-ed-bar{display:flex;align-items:center;justify-content:space-between;gap:10px}
.vd-ed-count{margin:0;font-weight:600;color:var(--muted)}
.vd-prev{min-width:0}
.vd-prev .vd-box{max-width:480px}
.vd-prevmsg{margin:0;color:var(--muted);font-size:.92rem}
.vd-form{display:grid;gap:12px;padding:14px;border-radius:16px;border:1px solid var(--line);background:var(--card);min-width:0}
.vd-form h3{font-size:1.02rem;margin:0}
.vd-row{display:grid;gap:10px;padding:12px;border-radius:16px;border:1px solid var(--line);background:var(--card);min-width:0}
.vd-row.hid{border-color:var(--btn-line)}
.vd-rowtop{display:grid;grid-template-columns:120px minmax(0,1fr);gap:12px;align-items:start;min-width:0}
.vd-rowtop .vd-box{border-radius:10px}
.vd-rowtop .vd-tx{display:grid;gap:6px;min-width:0}
.vd-tx input{width:100%;min-height:44px;padding:0 12px;border:1px solid var(--line-field);border-radius:12px;background:var(--field-bg,var(--card));color:var(--ink);font:inherit;min-width:0}
.vd-ac{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.vd-b{display:inline-grid;place-items:center;min-width:44px;min-height:44px;padding:0 12px;border-radius:12px;border:1px solid var(--line-field);background:var(--card);color:var(--ink);font:inherit;font-weight:600;cursor:pointer}
.vd-b svg{width:18px;height:18px}
.vd-b[disabled]{opacity:.45;cursor:default}
.vd-b:focus-visible{outline:3px solid var(--primary);outline-offset:2px}
.vd-b.danger{color:#b91c1c;border-color:rgba(185,28,28,.35)}
:root[data-theme="dark"] .vd-b.danger{color:#fca5a5;border-color:rgba(252,165,165,.35)}
.vd-hidnote{margin:0;color:#9f1239;font-weight:600;font-size:.92rem}
:root[data-theme="dark"] .vd-hidnote{color:#fda4af}
.vd-live-msg{margin:0;min-height:1.2em;color:var(--muted);font-size:.92rem}
@media(max-width:420px){
  .vd-rowtop{grid-template-columns:minmax(0,1fr)}
  .vd-ico{width:52px;height:52px;margin:-26px 0 0 -26px}
}
@media(prefers-reduced-motion:reduce){.vd-play,.vd-ico{transition:none}}

/* video manager rows: thumbnail + title with inline save on top, one tidy action bar below */
.vd-row{gap:12px;padding:14px;border-radius:18px}
.vd-rowtop{grid-template-columns:132px minmax(0,1fr);align-items:center}
.vd-rowtop .vd-tx{display:flex;align-items:center;gap:8px}
.vd-rowtop .vd-tx input{flex:1 1 auto;min-width:0}
.vd-rowtop .vd-tx .vd-ac{flex:none}
.vd-rowtop .vd-tx .vd-b{min-height:44px;padding:0 14px;background:var(--primary);border-color:var(--primary);color:#fff}
.vd-row>.vd-ac{flex-wrap:nowrap;gap:8px;padding-top:12px;border-top:1px solid var(--line)}
.vd-row>.vd-ac .vd-b{flex:none}
.vd-row>.vd-ac .vd-b.danger{display:inline-flex;align-items:center;gap:6px;margin-inline-start:auto;padding:0 14px;background:transparent}
.vd-row>.vd-ac .vd-b.danger svg{flex:none}
@media(max-width:559px){
  .vd-rowtop{grid-template-columns:96px minmax(0,1fr);gap:10px}
  .vd-rowtop .vd-tx{flex-wrap:wrap}
  .vd-rowtop .vd-tx input{flex:1 1 100%}
  .vd-rowtop .vd-tx .vd-ac{flex:1 1 100%}
  .vd-rowtop .vd-tx .vd-b{width:100%}
}