/* ── INTERACTIONS: Fill-in-blank, Matching, Ordering, Categorize ──────────── */

/* ── Shared interaction wrapper ──────────────────────────────────────────── */
.interaction-block {
  background: var(--bg-card);
  border: 1px solid var(--grey-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 24px 0;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.interaction-block.correct {
  border-color: #22C55E;
  background: linear-gradient(135deg, var(--success-bg) 0%, var(--bg-card) 100%);
}
.interaction-block.wrong {
  border-color: #EF4444;
}
.interaction-block.partial {
  border-color: #F59E0B;
}
.interaction-label {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #6366F1;
  margin-bottom: 8px;
}
.interaction-prompt {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.5;
}
.interaction-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}
.interaction-feedback {
  font-size: 14px;
  color: #475569;
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  display: none;
  line-height: 1.5;
}
.interaction-feedback.show { display: block; }
.interaction-feedback.correct { background: var(--success-bg); color: var(--success-text); border: 1px solid var(--success-border); }
.interaction-feedback.wrong { background: var(--error-bg); color: var(--error-text); border: 1px solid var(--error-border); }
.interaction-feedback.partial { background: var(--warning-bg); color: var(--warning-text); border: 1px solid var(--warning-border); }

/* ── FILL-IN-THE-BLANK ──────────────────────────────────────────────────── */
.fitb-text {
  font-size: 15px;
  line-height: 2.2;
  color: var(--text-primary);
}
.fitb-blank {
  display: inline-block;
  width: 80px;
  padding: 4px 10px;
  border: 2px dashed #94A3B8;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  text-align: center;
  background: var(--bg-code);
  color: var(--text-primary);
  vertical-align: baseline;
  transition: border-color 0.2s ease, background 0.2s ease;
  outline: none;
}
.fitb-blank:focus {
  border-color: #6366F1;
  background: #FFFFFF;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}
.fitb-blank.correct {
  border-color: #22C55E;
  border-style: solid;
  background: #F0FDF4;
  color: #166534;
}
.fitb-blank.wrong {
  border-color: #EF4444;
  border-style: solid;
  background: #FEF2F2;
  color: #991B1B;
}

/* ── DRAG-DROP MATCHING ─────────────────────────────────────────────────── */
.match-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.match-col-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #64748B;
  margin-bottom: 8px;
}
.match-terms {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.match-term {
  padding: 10px 14px;
  background: #EEF2FF;
  border: 2px solid #C7D2FE;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: #3730A3;
  cursor: grab;
  user-select: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease;
}
.match-term:hover { box-shadow: 0 2px 8px rgba(99, 102, 241, 0.15); }
.match-term.dragging { opacity: 0.5; transform: scale(0.95); }
.match-term.placed { opacity: 0.4; cursor: default; pointer-events: none; }
.match-term.selected {
  border-color: #6366F1;
  background: #6366F1;
  color: white;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.match-defs {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.match-def {
  padding: 10px 14px;
  background: #F8FAFC;
  border: 2px dashed #CBD5E1;
  border-radius: 8px;
  font-size: 13px;
  color: #475569;
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: border-color 0.15s ease, background 0.15s ease;
  cursor: pointer;
}
.match-def.drag-over {
  border-color: #6366F1;
  background: #EEF2FF;
}
.match-def .match-placed-term {
  display: inline-block;
  padding: 4px 10px;
  background: #6366F1;
  color: white;
  border-radius: 5px;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
  cursor: pointer;
}
.match-def .match-placed-term:hover { background: #4F46E5; }
.match-def.correct {
  border-color: #22C55E;
  border-style: solid;
  background: #F0FDF4;
}
.match-def.correct .match-placed-term { background: #16A34A; }
.match-def.wrong {
  border-color: #EF4444;
  border-style: solid;
  background: #FEF2F2;
}
.match-def.wrong .match-placed-term { background: #DC2626; }
.match-def .def-text { flex: 1; }

/* ── SEQUENCE ORDERING ──────────────────────────────────────────────────── */
.order-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  counter-reset: order-item;
}
.order-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: #F8FAFC;
  border: 2px solid #E2E8F0;
  border-radius: 8px;
  font-size: 14px;
  color: #334155;
  cursor: grab;
  user-select: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.2s ease, background 0.2s ease;
}
.order-item:hover { box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06); }
.order-item.dragging { opacity: 0.5; transform: scale(0.97); }
.order-item.drag-over { border-color: #6366F1; background: #EEF2FF; }
.order-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #E2E8F0;
  color: #475569;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s ease, color 0.2s ease;
}
.order-item.correct { border-color: #22C55E; background: #F0FDF4; }
.order-item.correct .order-num { background: #22C55E; color: white; }
.order-item.wrong { border-color: #EF4444; background: #FEF2F2; }
.order-item.wrong .order-num { background: #EF4444; color: white; }
.order-text { flex: 1; }
.order-grip {
  color: #94A3B8;
  font-size: 16px;
  flex-shrink: 0;
  cursor: grab;
}
.order-arrows {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}
.order-arrow-btn {
  width: 24px;
  height: 20px;
  border: 1px solid #CBD5E1;
  border-radius: 4px;
  background: white;
  color: #64748B;
  font-size: 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.15s ease;
}
.order-arrow-btn:hover { background: #F1F5F9; }

/* ── CATEGORIZE / SORT ──────────────────────────────────────────────────── */
.sort-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  min-height: 44px;
  padding: 12px;
  background: #F8FAFC;
  border: 2px dashed #E2E8F0;
  border-radius: 8px;
}
.sort-item {
  padding: 8px 14px;
  background: #FFF7ED;
  border: 2px solid #FDBA74;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: #9A3412;
  cursor: grab;
  user-select: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease;
}
.sort-item:hover { box-shadow: 0 2px 8px rgba(251, 146, 60, 0.2); }
.sort-item.dragging { opacity: 0.5; transform: scale(0.95); }
.sort-item.selected {
  border-color: #F97316;
  background: #F97316;
  color: white;
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.25);
}
.sort-item.placed { opacity: 0.4; pointer-events: none; }

.sort-buckets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}
.sort-bucket {
  border: 2px dashed #CBD5E1;
  border-radius: 10px;
  min-height: 100px;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.sort-bucket.drag-over {
  border-color: #F97316;
  background: #FFF7ED;
}
.sort-bucket-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #475569;
  padding: 10px 12px 8px;
  border-bottom: 1px solid #E2E8F0;
  text-align: center;
}
.sort-bucket-items {
  padding: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 44px;
}
.sort-bucket-items .sort-item {
  cursor: pointer;
}
.sort-bucket.correct { border-color: #22C55E; border-style: solid; }
.sort-bucket.correct .sort-bucket-label { color: #166534; }
.sort-bucket.wrong { border-color: #EF4444; border-style: solid; }
.sort-bucket.wrong .sort-bucket-label { color: #991B1B; }

/* ── Disabled state for completed interactions ──────────────────────────── */
.interaction-block.completed {
  pointer-events: none;
  opacity: 0.85;
}
.interaction-block.completed .check-btn { display: none; }
.interaction-block.completed .order-arrows { display: none; }
.interaction-block.completed .order-grip { display: none; }

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 820px) {
  .match-container {
    grid-template-columns: 1fr;
  }
  .sort-buckets {
    grid-template-columns: 1fr 1fr;
  }
  .interaction-block {
    padding: 20px 16px;
  }
}
@media (max-width: 480px) {
  .sort-buckets {
    grid-template-columns: 1fr;
  }
}

/* ── Dark mode overrides ─────────────────────────────────────────────────── */
[data-theme="dark"] .interaction-block {
  background: linear-gradient(135deg, #0F1520, #111827);
  border-color: #1C2536;
}
[data-theme="dark"] .interaction-block.correct {
  border-color: rgba(34, 197, 94, 0.4);
  box-shadow: var(--glow-green);
}
[data-theme="dark"] .fitb-blank { background: var(--bg-input); border-color: #475569; color: var(--text-primary); }
[data-theme="dark"] .fitb-blank:focus { background: #1E293B; }
[data-theme="dark"] .match-term { background: rgba(99,102,241,0.12); border-color: rgba(99,102,241,0.25); color: #A5B4FC; }
[data-theme="dark"] .match-def { background: var(--bg-card-alt); border-color: #1C2536; color: var(--text-secondary); }
[data-theme="dark"] .match-def.drag-over { background: rgba(99,102,241,0.1); border-color: #6366F1; }
[data-theme="dark"] .order-item { background: var(--bg-card-alt); border-color: #1C2536; color: var(--text-primary); }
[data-theme="dark"] .order-num { background: #1C2536; color: var(--text-secondary); }
[data-theme="dark"] .order-arrow-btn { background: var(--bg-card-alt); border-color: #1C2536; color: var(--text-muted); }
[data-theme="dark"] .sort-items { background: var(--bg-card-alt); border-color: #1C2536; }
[data-theme="dark"] .sort-item { background: rgba(249,115,22,0.1); border-color: rgba(249,115,22,0.25); color: #FDBA74; }
[data-theme="dark"] .sort-bucket { border-color: #1C2536; }
[data-theme="dark"] .sort-bucket-label { color: var(--text-secondary); border-bottom-color: #1C2536; }
[data-theme="dark"] .match-col-label { color: var(--text-muted); }

/* ── MULTIPLE CHOICE (MCQ) ─────────────────────────────────────────────── */
.mcq-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 8px 0;
}
.mcq-opt {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1.5px solid var(--grey-border, #CBD5E1);
  border-radius: 8px;
  cursor: pointer;
  font-size: 13.5px;
  transition: all 0.2s ease;
  background: var(--bg-card, #fff);
  color: var(--text-primary, #0F172A);
  line-height: 1.5;
}
.mcq-opt:hover {
  border-color: #6366F1;
  background: #EEF2FF;
}
.mcq-opt .radio {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid #94A3B8;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.mcq-opt.selected {
  border-color: #6366F1;
  background: #EEF2FF;
  font-weight: 500;
}
.mcq-opt.selected .radio {
  border-color: #6366F1;
  background: #6366F1;
}
.mcq-opt.selected .radio::after {
  content: "";
  width: 7px;
  height: 7px;
  background: white;
  border-radius: 50%;
}
.mcq-opt.correct-answer {
  border-color: #22C55E;
  background: #F0FDF4;
}
.mcq-opt.correct-answer .radio {
  border-color: #22C55E;
  background: #22C55E;
}
.mcq-opt.correct-answer .radio::after {
  content: "";
  width: 7px;
  height: 7px;
  background: white;
  border-radius: 50%;
}
.mcq-opt.wrong-answer {
  border-color: #EF4444;
  background: #FEF2F2;
}
.mcq-opt.wrong-answer .radio {
  border-color: #EF4444;
  background: #EF4444;
}
.mcq-opt.wrong-answer .radio::after {
  content: "";
  width: 7px;
  height: 7px;
  background: white;
  border-radius: 50%;
}

/* Dark mode MCQ */
[data-theme="dark"] .mcq-opt {
  background: var(--bg-card-alt);
  border-color: #1C2536;
  color: var(--text-primary);
}
[data-theme="dark"] .mcq-opt:hover {
  border-color: #6366F1;
  background: rgba(99, 102, 241, 0.1);
}
[data-theme="dark"] .mcq-opt.selected {
  border-color: #6366F1;
  background: rgba(99, 102, 241, 0.15);
}
[data-theme="dark"] .mcq-opt .radio {
  border-color: #475569;
}

/* ── SIMPLE SORT (drag-to-reorder) ───────────────────────────────────── */
.sort-container {
  margin: 8px 0;
}
.sort-container .sort-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  margin: 4px 0;
  border: 1.5px solid var(--grey-border, #CBD5E1);
  border-radius: 8px;
  background: var(--bg-card, #fff);
  cursor: grab;
  font-size: 13px;
  transition: all 0.2s ease;
  user-select: none;
  color: var(--text-primary, #0F172A);
}
.sort-container .sort-item:active {
  cursor: grabbing;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.sort-container .sort-item .grip {
  color: var(--text-muted, #94A3B8);
  font-size: 14px;
  flex-shrink: 0;
}
.sort-container .sort-item.correct-pos {
  border-color: #22C55E;
  background: #F0FDF4;
}
.sort-container .sort-item.wrong-pos {
  border-color: #EF4444;
  background: #FEF2F2;
}

/* Dark mode simple sort */
[data-theme="dark"] .sort-container .sort-item {
  background: var(--bg-card-alt);
  border-color: #1C2536;
  color: var(--text-primary);
}
[data-theme="dark"] .sort-container .sort-item .grip {
  color: var(--text-muted);
}
[data-theme="dark"] .sort-container .sort-item.correct-pos {
  border-color: #22C55E;
  background: rgba(34, 197, 94, 0.1);
}
[data-theme="dark"] .sort-container .sort-item.wrong-pos {
  border-color: #EF4444;
  background: rgba(239, 68, 68, 0.1);
}