/* MIXED TENSES TRAINER STYLES */

.level-info {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
}

.level-info h2 {
  color: var(--text);
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.level-info p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px;
  transition: width 0.3s ease;
}

.quota-display {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.start-screen {
  text-align: center;
  padding: 3rem 1rem;
}

.start-content .emoji {
  margin-bottom: 1rem;
}

.start-content h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--text);
}

.level-selector {
  margin-top: 2rem;
}

.level-selector h3 {
  color: var(--text);
  margin-bottom: 1rem;
}

.level-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.game-screen {
  max-width: 800px;
  margin: 0 auto;
}

.question-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.question-text {
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: 2rem;
  line-height: 1.6;
  text-align: center;
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.option-btn {
  padding: 1rem 1.5rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.option-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-2px);
}

.option-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.option-btn.correct {
  border-color: var(--success);
  background: rgba(0, 255, 100, 0.1);
  color: var(--success);
}

.option-btn.wrong {
  border-color: var(--error);
  background: rgba(255, 0, 0, 0.1);
  color: var(--error);
}

/* Error finding mode */
.error-options {
  text-align: center;
}

.error-instruction {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 1rem;
}

.error-words {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.error-word {
  padding: 0.75rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  min-width: 80px;
}

.error-word:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.error-word.correct {
  border-color: var(--success);
  background: rgba(0, 255, 100, 0.1);
  color: var(--success);
}

.error-word.wrong {
  border-color: var(--error);
  background: rgba(255, 0, 0, 0.1);
  color: var(--error);
}

/* Feedback */
.feedback {
  text-align: center;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

.feedback.correct {
  background: rgba(0, 255, 100, 0.1);
  border: 1px solid var(--success);
}

.feedback.wrong {
  background: rgba(255, 0, 0, 0.1);
  border: 1px solid var(--error);
}

.feedback-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.feedback-text {
  font-size: 1.1rem;
  font-weight: 600;
}

/* Game controls */
.game-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

/* Results screen */
.results-screen {
  text-align: center;
  padding: 2rem 1rem;
}

.results-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  border: 1px solid var(--border);
  max-width: 600px;
  margin: 0 auto;
}

.results-card h2 {
  color: var(--text);
  margin-bottom: 2rem;
  font-size: 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-label {
  display: block;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.stat-value {
  display: block;
  color: var(--text);
  font-size: 1.5rem;
  font-weight: 700;
}

.results-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

/* Responsive design */
@media (max-width: 768px) {
  .level-buttons {
    grid-template-columns: 1fr;
  }

  .options-grid {
    grid-template-columns: 1fr;
  }

  .error-words {
    flex-direction: column;
    align-items: center;
  }

  .error-word {
    width: 100%;
    max-width: 200px;
  }

  .game-controls {
    flex-direction: column;
    align-items: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .results-actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* Animations */
@keyframes pulse-correct {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes shake-wrong {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.option-btn.correct {
  animation: pulse-correct 0.6s ease;
}

.option-btn.wrong {
  animation: shake-wrong 0.5s ease;
}

.error-word.correct {
  animation: pulse-correct 0.6s ease;
}

.error-word.wrong {
  animation: shake-wrong 0.5s ease;
}

/* Level transition effects */
.level-info {
  animation: fadeIn 0.5s ease;
}

.question-card {
  animation: slideUp 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════════════════════════
   CUSTOM BUILDER — TAB SWITCHER
   ═══════════════════════════════════════════ */

.tab-switcher {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 0.25rem;
  margin-bottom: 2rem;
}

.tab-btn {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.tab-btn.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.tab-btn:hover:not(.active) {
  color: var(--text);
  background: rgba(99, 102, 241, 0.1);
}

.tab-content {
  display: none;
  animation: fadeIn 0.4s ease;
}
.tab-content.active {
  display: block;
}

/* ═══════════════════════════════════════════
   CUSTOM BUILDER — SECTIONS
   ═══════════════════════════════════════════ */

.custom-builder {
  text-align: left;
  max-width: 700px;
  margin: 0 auto;
}

.builder-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.builder-section h3 {
  color: var(--text);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.tense-counter {
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--primary);
}

/* ═══════════════════════════════════════════
   TENSE GRID — 5 COLUMNS
   ═══════════════════════════════════════════ */

.tense-grid {
  display: grid;
  grid-template-columns: auto 1fr 1fr 1fr 1fr;
  gap: 0.5rem;
  align-items: center;
}

.tense-grid-header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  text-align: center;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.tense-row-label {
  font-weight: 700;
  color: var(--text);
  font-size: 0.95rem;
  padding-right: 0.5rem;
}

.tense-check {
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.tense-check input[type="checkbox"] {
  display: none;
}

.check-label {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-width: 54px;
  padding: 0.6rem 0.5rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.25s ease;
  user-select: none;
}

.tense-check input:checked + .check-label {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
  transform: scale(1.05);
}

.check-label:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.05);
}

/* ═══════════════════════════════════════════
   QUICK SELECT PILLS
   ═══════════════════════════════════════════ */

.quick-select {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  justify-content: center;
}

.qs-btn {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.qs-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(99, 102, 241, 0.08);
}

.qs-btn-clear {
  border-color: var(--error);
  color: var(--error);
}
.qs-btn-clear:hover {
  background: rgba(255, 0, 0, 0.08);
  border-color: var(--error);
  color: var(--error);
}

/* ═══════════════════════════════════════════
   TOGGLE CHECKBOXES (Sentence/Task Types)
   ═══════════════════════════════════════════ */

.toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.toggle-check {
  cursor: pointer;
  flex: 1;
  min-width: 130px;
}

.toggle-check input[type="checkbox"] {
  display: none;
}

.toggle-label {
  display: block;
  padding: 0.7rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9rem;
  text-align: center;
  transition: all 0.25s ease;
  user-select: none;
}

.toggle-check input:checked + .toggle-label {
  border-color: var(--success, #22c55e);
  background: rgba(34, 197, 94, 0.1);
  color: var(--success, #22c55e);
}

.toggle-label:hover {
  border-color: var(--primary);
}

/* ═══════════════════════════════════════════
   SLIDER
   ═══════════════════════════════════════════ */

.custom-slider {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(90deg, var(--primary), var(--accent, #8b5cf6));
  border-radius: 3px;
  outline: none;
  margin: 0.75rem 0 0.5rem;
}

.custom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
  transition: transform 0.15s ease;
}

.custom-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.custom-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.slider-value {
  color: var(--primary);
  font-weight: 700;
  font-size: 1.1rem;
}

/* ═══════════════════════════════════════════
   SUMMARY BAR & START BUTTON
   ═══════════════════════════════════════════ */

.builder-summary {
  text-align: center;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  color: var(--text);
  font-size: 1rem;
}

.btn-custom-start {
  width: 100%;
  padding: 1rem 2rem;
  font-size: 1.2rem;
  font-weight: 700;
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.btn-custom-start:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.btn-custom-start:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* ═══════════════════════════════════════════
   RESPONSIVE — MOBILE
   ═══════════════════════════════════════════ */

@media (max-width: 600px) {
  .tense-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }

  /* Hide the top headers (Simple, Continuous etc) completely */
  .tense-grid-header {
    display: none;
  }

  /* Make row labels (Present, Past, Future) span full width and act as section headers */
  .tense-row-label {
    grid-column: 1 / -1;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.25rem;
    color: var(--primary);
    font-size: 1.1rem;
  }

  /* Adjust checkbox label size */
  .check-label {
    padding: 0.75rem 0.5rem;
    font-size: 0.9rem;
  }

  .toggle-row {
    flex-direction: column;
  }

  .tab-btn {
    font-size: 0.9rem;
    padding: 0.6rem 0.5rem;
  }
}