/* ==========================================================================
   Exercise Types
   code-arrange, output-predict, bug-find, word-bank, categorize
   ========================================================================== */

/* ── Shared Exercise Container ── */
.exercise-container {
  margin: 24px 0;
  padding: 20px;
  border-radius: 12px;
  border-left: 4px solid #f5a623;
  background: var(--bg-card, #22223b);
  transition: background-color 0.3s ease;
}

.exercise-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.exercise-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(245, 166, 35, 0.15);
  color: #f5a623;
}

.exercise-xp {
  font-size: 11px;
  font-weight: 600;
  color: #FFD700;
}

.exercise-question {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary, #e0e0e0);
  margin-bottom: 16px;
  line-height: 1.5;
}

.exercise-feedback {
  display: none;
  margin-top: 12px;
  padding: 12px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.5;
}

.exercise-feedback.correct {
  display: block;
  background: var(--success-bg, rgba(78, 205, 196, 0.15));
  color: var(--success, #4ecdc4);
  border: 1px solid rgba(78, 205, 196, 0.3);
}

.exercise-feedback.incorrect {
  display: block;
  background: var(--error-bg, rgba(233, 69, 96, 0.15));
  color: var(--error, #e94560);
  border: 1px solid rgba(233, 69, 96, 0.3);
}

.exercise-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 10px 20px;
  border-radius: 6px;
  border: none;
  background: #f5a623;
  color: #1a1a2e;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.15s;
}

.exercise-btn:hover { background: #ffc040; transform: scale(1.03); }
.exercise-btn:active { transform: scale(0.97); }
.exercise-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.exercise-hint-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  margin-right: 8px;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border-color, rgba(255,255,255,0.1));
  background: transparent;
  color: var(--text-muted, #718096);
  font-size: 13px;
  cursor: pointer;
}

.exercise-hint-btn:hover { border-color: var(--accent, #61dafb); color: var(--accent, #61dafb); }

.exercise-hint {
  display: none;
  margin-top: 8px;
  padding: 10px 12px;
  border-radius: 6px;
  background: var(--bg-tertiary, #2d3748);
  font-size: 13px;
  color: var(--text-secondary, #a0aec0);
}

.exercise-hint.visible { display: block; }

/* ── Code Arrange (Drag & Drop) ── */
.code-arrange-answer {
  min-height: 60px;
  padding: 12px;
  border-radius: 8px;
  border: 2px dashed var(--border-color, rgba(255,255,255,0.15));
  background: var(--bg-tertiary, #2d3748);
  margin-bottom: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  transition: border-color 0.2s ease;
}

.code-arrange-answer.drag-over {
  border-color: var(--accent, #61dafb);
  background: rgba(97, 218, 251, 0.05);
}

.code-arrange-answer .placeholder {
  color: var(--text-muted, #718096);
  font-size: 13px;
  font-style: italic;
}

.code-arrange-tokens {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.code-token {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 6px;
  background: var(--bg-tertiary, #2d3748);
  border: 1px solid var(--border-color, rgba(255,255,255,0.15));
  color: var(--accent, #61dafb);
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  cursor: grab;
  user-select: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.2s ease;
}

.code-token:hover {
  border-color: var(--accent, #61dafb);
  box-shadow: 0 2px 8px rgba(97, 218, 251, 0.2);
  transform: translateY(-1px);
}

.code-token:active { cursor: grabbing; }
.code-token.dragging { opacity: 0.4; }
.code-token.placed { opacity: 0.3; pointer-events: none; }

.code-token.in-answer {
  background: rgba(97, 218, 251, 0.15);
  border-color: var(--accent, #61dafb);
  cursor: pointer;
}

.code-token.in-answer:hover {
  background: rgba(233, 69, 96, 0.15);
  border-color: var(--error, #e94560);
}

.code-token.correct-token {
  border-color: var(--success, #4ecdc4);
  background: rgba(78, 205, 196, 0.15);
}

.code-token.incorrect-token {
  border-color: var(--error, #e94560);
  background: rgba(233, 69, 96, 0.15);
}

.code-token.distractor { color: var(--text-muted, #718096); }

/* ── Output Predict ── */
.output-predict-code {
  padding: 16px;
  border-radius: 8px;
  background: var(--code-theme-background, #1a1a2e);
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  color: var(--text-primary, #e0e0e0);
  line-height: 1.6;
  margin-bottom: 16px;
  overflow-x: auto;
  white-space: pre;
}

/* ── Bug Find ── */
.bug-find-code {
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 12px;
}

.bug-find-line {
  display: flex;
  align-items: flex-start;
  padding: 4px 12px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease;
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  line-height: 1.6;
}

.bug-find-line:hover {
  background: var(--bg-hover, rgba(255,255,255,0.04));
}

.bug-find-line .line-num {
  color: var(--text-muted, #718096);
  min-width: 30px;
  text-align: right;
  margin-right: 12px;
  user-select: none;
  flex-shrink: 0;
}

.bug-find-line .line-code {
  color: var(--text-primary, #e0e0e0);
  white-space: pre;
}

.bug-find-line.selected {
  background: rgba(233, 69, 96, 0.12);
  border-left-color: var(--error, #e94560);
}

.bug-find-line.correct-bug {
  background: rgba(78, 205, 196, 0.12);
  border-left-color: var(--success, #4ecdc4);
}

.bug-find-line.missed-bug {
  background: rgba(245, 166, 35, 0.12);
  border-left-color: #f5a623;
}

.bug-find-selected {
  font-size: 12px;
  color: var(--text-muted, #718096);
  margin-bottom: 8px;
}

/* ── Word Bank ── */
.word-bank-code {
  padding: 16px;
  border-radius: 8px;
  background: var(--code-theme-background, #1a1a2e);
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  color: var(--text-primary, #e0e0e0);
  line-height: 2;
  margin-bottom: 16px;
  white-space: pre-wrap;
}

.word-bank-blank {
  display: inline-block;
  min-width: 80px;
  padding: 2px 8px;
  border-bottom: 2px dashed var(--accent, #61dafb);
  color: var(--accent, #61dafb);
  cursor: pointer;
  transition: border-color 0.2s ease;
  font-weight: 600;
}

.word-bank-blank.filled {
  border-bottom-style: solid;
  background: rgba(97, 218, 251, 0.1);
  border-radius: 3px 3px 0 0;
}

.word-bank-blank.correct { border-bottom-color: var(--success, #4ecdc4); color: var(--success, #4ecdc4); }
.word-bank-blank.incorrect { border-bottom-color: var(--error, #e94560); color: var(--error, #e94560); }

.word-bank-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.word-bank-token {
  padding: 6px 14px;
  border-radius: 6px;
  background: var(--bg-tertiary, #2d3748);
  border: 1px solid var(--border-color, rgba(255,255,255,0.15));
  color: var(--text-primary, #e0e0e0);
  font-family: var(--font-mono, monospace);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.2s ease, opacity 0.2s ease;
}

.word-bank-token:hover { border-color: var(--accent, #61dafb); }
.word-bank-token.used { opacity: 0.3; pointer-events: none; }

/* ── Categorize ── */
.categorize-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.categorize-item {
  padding: 8px 16px;
  border-radius: 6px;
  background: var(--bg-tertiary, #2d3748);
  border: 1px solid var(--border-color, rgba(255,255,255,0.15));
  color: var(--text-primary, #e0e0e0);
  font-size: 13px;
  cursor: grab;
  user-select: none;
  transition: transform 0.15s ease, opacity 0.2s ease;
}

.categorize-item:hover { border-color: var(--accent, #61dafb); transform: translateY(-1px); }
.categorize-item.placed { opacity: 0.3; pointer-events: none; }
.categorize-item.correct-item { border-color: var(--success, #4ecdc4); background: rgba(78, 205, 196, 0.12); }
.categorize-item.incorrect-item { border-color: var(--error, #e94560); background: rgba(233, 69, 96, 0.12); }
.categorize-item.in-category { cursor: pointer; }
.categorize-item.in-category:hover { background: rgba(233, 69, 96, 0.15); border-color: var(--error, #e94560); }

.categorize-zones {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}

.categorize-zone {
  border: 2px dashed var(--border-color, rgba(255,255,255,0.15));
  border-radius: 8px;
  padding: 12px;
  min-height: 100px;
  transition: border-color 0.2s ease;
}

.categorize-zone.drag-over {
  border-color: var(--accent, #61dafb);
  background: rgba(97, 218, 251, 0.05);
}

.categorize-zone-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted, #718096);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-color, rgba(255,255,255,0.08));
}

.categorize-zone-items {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .exercise-container { padding: 16px; margin: 16px 0; }
  .exercise-question { font-size: 15px; }
  .code-token { padding: 6px 10px; font-size: 12px; }
  .categorize-zones { grid-template-columns: 1fr; }
  .code-arrange-tokens { gap: 6px; }
}