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strong{font-size:1.1rem}.grouping__hint{color:var(--muted);margin:0;font-size:.9rem}.grouping__buckets{grid-template-columns:repeat(2,1fr);gap:.6rem;display:grid}.bucket{border-radius:var(--radius-sm);border:2px dashed var(--border);background:var(--surface);min-height:4.5rem;color:var(--text);cursor:pointer;text-align:center;place-items:center;padding:.6rem;font-weight:700;transition:transform .12s,border-color .12s;display:grid}.bucket:hover,.bucket.is-over{border-color:var(--learn-accent);transform:scale(1.04)}.bucket.is-correct{background:var(--learn-correct);border-color:var(--learn-correct);color:#fff}.bucket.is-wrong{background:var(--learn-wrong);border-color:var(--learn-wrong);color:#fff}.drag-ghost{z-index:60;pointer-events:none;background:var(--surface);border:2px solid var(--learn-accent);border-radius:var(--radius-sm);width:9rem;box-shadow:var(--shadow);text-align:center;padding:.5rem;font-size:.9rem;font-weight:700;position:fixed;transform:translate(-50%,-50%)}.drag-ghost img{width:56px;height:56px}.praise{color:#66bb6a;z-index:70;pointer-events:none;background:#212121cc;place-items:center;font-size:3rem;font-weight:800;animation:.9s ease-out forwards praise;display:grid;position:fixed;inset:0}@keyframes praise{0%{opacity:0;transform:scale(.8)}20%{opacity:1;transform:scale(1.05)}80%{opacity:1}to{opacity:0}}ca-player{margin:1rem 0;display:block}ca-player audio{width:100%}ca-player.is-ready audio{display:none}.player-bar{z-index:40;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);grid-template-columns:auto 1fr auto;align-items:center;gap:.5rem .9rem;margin-top:1rem;padding:.6rem .9rem;display:grid;position:sticky;bottom:0}.player-bar__controls{align-items:center;gap:.35rem;display:flex}.player-bar__play{background:var(--primary);width:3rem;height:3rem;color:var(--on-primary);cursor:pointer;border:0;border-radius:50%;place-items:center;display:grid}.player-bar__play:hover{background:var(--primary-hover)}.player-bar__skip{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:50%;width:2.4rem;height:2.4rem;font-size:.7rem;font-weight:700}.player-bar__main{flex-direction:column;gap:.2rem;min-width:0;display:flex}.player-bar__title{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;font-size:.85rem;overflow:hidden}.player-bar__seek{width:100%;accent-color:var(--primary);margin:0}.player-bar__time{color:var(--muted);font-variant-numeric:tabular-nums;justify-content:space-between;font-size:.75rem;display:flex}.player-bar__rate{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:999px;min-width:3.6rem;padding:.35rem .7rem;font-size:.85rem;font-weight:600}.player-bar__error{color:#b3261e;grid-column:1/-1;margin:0;font-size:.85rem}@media (width<=40rem){.player-bar{grid-template-columns:auto 1fr}.player-bar__rate{grid-column:2;justify-self:end}}ca-tts{margin:1rem 0;display:block}ca-tts[hidden]{display:none}ca-tts.is-floating .tts-bar{width:min(var(--measure), calc(100% - 1rem));margin:0;position:fixed;bottom:.5rem;left:50%;transform:translate(-50%)}body.has-floating-player{padding-bottom:7rem}.tts-bar__voice{color:var(--muted);grid-column:1/-1;align-items:center;gap:.5rem;min-width:0;font-size:.8rem;display:flex}.tts-bar__voice[hidden]{display:none}.tts-bar__voice select{min-width:0;max-width:100%;font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);flex:1;padding:.2rem .4rem}::highlight(ca-tts){background-color:color-mix(in srgb, var(--primary) 24%, transparent)}.tts__note{color:var(--muted);margin:0 0 .5rem;font-size:.9rem}