.tb-page{max-width:860px;margin:0 auto;padding:16px;}
.tb-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;}
.tb-actions{display:flex;gap:8px;flex-wrap:wrap;}
.tb-btn{background:#222;color:#fff;border:0;padding:8px 12px;border-radius:10px;cursor:pointer;text-decoration:none;display:inline-block;}
.tb-muted{opacity:.75}
.tb-lesson-list{display:flex;flex-direction:column;gap:12px;margin-top:12px;}
.tb-lesson-card{border:1px solid rgba(0,0,0,.12);border-radius:14px;padding:12px;}
.tb-block{border:1px solid rgba(0,0,0,.08);border-radius:14px;padding:12px;margin:12px 0;}
.tb-block-title{margin:0 0 8px 0;font-size:18px;}
.tb-label{display:block;font-size:13px;opacity:.8;margin-bottom:4px;}
.tb-input{width:100%;padding:8px 10px;border-radius:10px;border:1px solid rgba(0,0,0,.25);}
.tb-text-pre{white-space:pre-wrap;line-height:1.8}
.tb-convert-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.tb-convert-profiles{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}
.tb-select{width:100%;padding:8px 10px;border-radius:10px;border:1px solid rgba(0,0,0,.25);background:#fff}
.tb-feedback{margin-top:10px;min-height:18px;}
.tb-sandbox-row{display:flex;gap:8px;align-items:center;margin-top:8px}
.tb-sandbox-row .tb-input{flex:1}
.tb-editor-textarea{width:100%;font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; padding:10px;border-radius:12px;border:1px solid rgba(0,0,0,.25)}
.tb-alert{background:#fff5cc;border:1px solid rgba(0,0,0,.15);padding:8px 10px;border-radius:12px;margin:10px 0}
@media (max-width:720px){.tb-convert-grid{grid-template-columns:1fr}.tb-convert-profiles{grid-template-columns:1fr}.tb-header{flex-direction:column}}

/* === MATCHBLOCK UI STYLES === */
/* This section is appended to keep MatchBlock self-contained without changing page templates. */

/* MatchBlock base */
.tb-match-grid{display:flex;flex-direction:column;gap:10px;margin-top:8px}
.tb-match-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:start}
.tb-match-left{display:flex;gap:10px;align-items:center}
.tb-match-img{width:64px;height:64px;object-fit:contain;border:1px solid rgba(0,0,0,.12);border-radius:12px;background:#fff}
.tb-match-text{font-size:18px;line-height:1.4}

.tb-match-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}

/* Bank tiles (drag/tap) */
.tb-match-bank{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}
.tb-match-tile{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:10px 12px;
  border:1px solid rgba(0,0,0,.14);
  border-radius:14px;
  background:#fff;
  box-shadow:0 1px 0 rgba(0,0,0,.03);
  cursor:grab;
  user-select:none;
  touch-action:none;
  min-height:56px;
}
.tb-match-tile:active{cursor:grabbing}
.tb-match-tile.tb-picked{outline:2px solid rgba(0,0,0,.35)}
.tb-match-tile-img{width:44px;height:44px;object-fit:contain;border-radius:10px}
.tb-match-tile-text{font-size:20px}

/* Drop zones */
.tb-match-drop{
  min-height:56px;
  display:flex;
  align-items:center;
  justify-content:flex-start;
  gap:10px;
  padding:10px 12px;
  border:2px dashed rgba(0,0,0,.20);
  border-radius:14px;
  background:rgba(255,255,255,.65);
}
.tb-match-drop.tb-drop-over{background:rgba(0,0,0,.04)}
.tb-match-drop.tb-match-ok{border-style:solid;border-color:rgba(0,120,0,.45)}
.tb-match-drop.tb-match-bad{border-style:solid;border-color:rgba(180,0,0,.45)}
.tb-match-drop-placeholder{opacity:.65}

/* Tile scale (script drills) */
.tb-tile-scale-sm .tb-match-tile-text{font-size:16px}
.tb-tile-scale-md .tb-match-tile-text{font-size:20px}
.tb-tile-scale-lg .tb-match-tile-text{font-size:26px}
.tb-tile-scale-xl .tb-match-tile-text{font-size:32px}
.tb-tile-scale-lg .tb-match-text{font-size:22px}
.tb-tile-scale-xl .tb-match-text{font-size:26px}

/* Cards layout */
.tb-match-layout-cards .tb-match-cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:14px;
  margin-top:10px;
}
.tb-match-layout-cards .tb-match-card{display:grid;grid-template-rows:auto auto;gap:12px}
.tb-match-layout-cards .tb-match-card-front{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  min-height:140px;
  padding:16px;
  border:1px solid rgba(0,0,0,.12);
  border-radius:16px;
  background:#fff;
}
.tb-match-layout-cards .tb-match-card-img{width:92px;height:92px;object-fit:contain;border-radius:14px}
.tb-match-layout-cards .tb-match-card-text{font-size:30px;line-height:1.1}
.tb-match-layout-cards .tb-match-card-drop{
  justify-content:center;
  min-height:84px;
  border:2px dashed rgba(0,0,0,.25);
  background:rgba(255,255,255,.85);
}
/* === END MATCHBLOCK UI STYLES === */


/* === ARRANGEBLOCK UI STYLES === */
/* ArrangeBlock: drag/tap tiles into ordered slots (rail). */
.tb-arrange-rail{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
.tb-arrange-slot{
  min-width:120px;
  min-height:62px;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:10px 12px;
  border:2px dashed rgba(0,0,0,.20);
  border-radius:14px;
  background:rgba(255,255,255,.65);
}
.tb-arrange-slot.tb-drop-over{background:rgba(0,0,0,.04)}
.tb-arrange-slot.tb-match-ok{border-style:solid;border-color:rgba(0,120,0,.45)}
.tb-arrange-slot.tb-match-bad{border-style:solid;border-color:rgba(180,0,0,.45)}
.tb-arrange-placeholder{opacity:.65}

.tb-arrange-bank{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}
.tb-arrange-tile{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:10px 12px;
  border:1px solid rgba(0,0,0,.14);
  border-radius:14px;
  background:#fff;
  box-shadow:0 1px 0 rgba(0,0,0,.03);
  cursor:grab;
  user-select:none;
  touch-action:none;
  min-height:56px;
}
.tb-arrange-tile:active{cursor:grabbing}
.tb-arrange-tile.tb-picked{outline:2px solid rgba(0,0,0,.35)}
.tb-arrange-tile-img{width:44px;height:44px;object-fit:contain;border-radius:10px}
.tb-arrange-tile-text{font-size:20px}

.tb-tile-scale-sm .tb-arrange-tile-text{font-size:16px}
.tb-tile-scale-md .tb-arrange-tile-text{font-size:20px}
.tb-tile-scale-lg .tb-arrange-tile-text{font-size:26px}
.tb-tile-scale-xl .tb-arrange-tile-text{font-size:32px}

.tb-arrange-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
/* === END ARRANGEBLOCK UI STYLES === */

/* === GAPFILLBLOCK UI STYLES === */
/* GapFillBlock: inline blanks with check/reset. */
.tb-gapfill-line{font-size:18px;line-height:1.9}
.tb-gapfill-blank{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0 4px;
}
.tb-gapfill-input{
  width:8ch;
  min-width:6ch;
  padding:6px 8px;
  border:1px solid rgba(0,0,0,.18);
  border-radius:10px;
  background:#fff;
  font-size:18px;
}
.tb-gapfill-input.tb-gap-ok{border-color:rgba(0,120,0,.45);outline:2px solid rgba(0,120,0,.18)}
.tb-gapfill-input.tb-gap-bad{border-color:rgba(180,0,0,.45);outline:2px solid rgba(180,0,0,.14)}

.tb-gapfill-select{
  padding:6px 8px;
  border:1px solid rgba(0,0,0,.18);
  border-radius:10px;
  background:#fff;
  font-size:18px;
}
.tb-gapfill-select.tb-gap-ok{border-color:rgba(0,120,0,.45);outline:2px solid rgba(0,120,0,.18)}
.tb-gapfill-select.tb-gap-bad{border-color:rgba(180,0,0,.45);outline:2px solid rgba(180,0,0,.14)}

.tb-gapfill-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.tb-gapfill-help{margin-top:8px;opacity:.7}
/* === END GAPFILLBLOCK UI STYLES === */


/* === GAPFILL DRAG UI STYLES === */
/* Drag Cloze (GapFillBlock mode: drag). */
.tb-gapdrag-line{font-size:18px;line-height:1.9}
.tb-gapdrag-drop{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-width:6ch;
  min-height:44px;
  padding:6px 10px;
  margin:0 4px;
  border:2px dashed rgba(0,0,0,.20);
  border-radius:12px;
  background:rgba(255,255,255,.65);
  vertical-align:middle;
}
.tb-gapdrag-drop.tb-drop-over{background:rgba(0,0,0,.04)}
.tb-gapdrag-drop.tb-match-ok{border-style:solid;border-color:rgba(0,120,0,.45)}
.tb-gapdrag-drop.tb-match-bad{border-style:solid;border-color:rgba(180,0,0,.45)}
.tb-gapdrag-placeholder{opacity:.65}

.tb-gapdrag-bank{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0}
.tb-gapdrag-tile{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:10px 12px;
  border:1px solid rgba(0,0,0,.14);
  border-radius:14px;
  background:#fff;
  box-shadow:0 1px 0 rgba(0,0,0,.03);
  cursor:grab;
  user-select:none;
  touch-action:none;
  min-height:50px;
}
.tb-gapdrag-tile:active{cursor:grabbing}
.tb-gapdrag-tile.tb-picked{outline:2px solid rgba(0,0,0,.35)}
.tb-gapdrag-tile-img{width:44px;height:44px;object-fit:contain;border-radius:10px}
.tb-gapdrag-tile-text{font-size:20px}

.tb-gapdrag-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}

/* Scale hook (reuse tb-tile-scale-*) */
.tb-tile-scale-sm .tb-gapdrag-tile-text{font-size:16px}
.tb-tile-scale-md .tb-gapdrag-tile-text{font-size:20px}
.tb-tile-scale-lg .tb-gapdrag-tile-text{font-size:26px}
.tb-tile-scale-xl .tb-gapdrag-tile-text{font-size:32px}

/* === END GAPFILL DRAG UI STYLES === */