/* ============================================
   CRISLYN'S MATH ADVENTURE — UI Components
   ============================================ */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-bounce);
  border: 2px solid transparent;
  min-height: 48px;
  user-select: none;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translateY(0) scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  color: var(--color-primary-dark);
}

.btn-accent:hover {
  background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
}

.btn-teal {
  background: linear-gradient(135deg, var(--color-teal), var(--color-teal-light));
  color: var(--color-text-inverse);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary-light);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-success {
  background: linear-gradient(135deg, var(--color-success), #4ADE80);
  color: var(--color-text-inverse);
}

.btn-error {
  background: linear-gradient(135deg, var(--color-error), #F87171);
  color: var(--color-text-inverse);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  min-height: 56px;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  min-height: 36px;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: var(--radius-full);
}

.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
  transition: all var(--duration-normal) var(--ease-smooth);
  border: 2px solid transparent;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  border-color: var(--color-primary-lighter);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.card-header h3 {
  font-size: var(--text-xl);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.card-icon-purple {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.card-icon-teal {
  background: #CCFBF1;
  color: var(--color-teal);
}

.card-icon-coral {
  background: #FFF7ED;
  color: var(--color-coral);
}

.card-icon-accent {
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
}

/* Chapter cards for dashboard */
.chapter-card {
  position: relative;
  overflow: hidden;
}

.chapter-card .chapter-number {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
}

.chapter-card.completed {
  border-color: var(--color-accent);
}

.chapter-card.completed .chapter-number {
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

.chapter-card.locked {
  opacity: 0.6;
  cursor: default;
}

.chapter-card.locked:hover {
  transform: none;
  box-shadow: var(--shadow-md);
}

.chapter-card .chapter-emoji {
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
}

.chapter-card .chapter-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-2);
}

.chapter-card .chapter-status {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: var(--space-2);
  background: var(--color-surface);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.tab {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--text-base);
  text-align: center;
  transition: all var(--duration-normal) var(--ease-bounce);
  color: var(--color-text-light);
  cursor: pointer;
}

.tab:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.tab.active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.tab-content {
  display: none;
  padding: var(--space-8) 0;
}

.tab-content.active {
  display: block;
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.section-header h2 {
  margin-bottom: var(--space-2);
}

.section-header p {
  color: var(--color-text-light);
  font-size: var(--text-lg);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Lesson Card --- */
.lesson-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.lesson-card-header {
  padding: var(--space-4) var(--space-6);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.lesson-card-header .lesson-number {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.lesson-card-header h3 {
  color: var(--color-text-inverse);
  font-size: var(--text-lg);
  flex: 1;
}

.lesson-card-header .lesson-toggle {
  font-size: var(--text-xl);
  transition: transform var(--duration-normal) var(--ease-smooth);
}

.lesson-card.open .lesson-toggle {
  transform: rotate(180deg);
}

.lesson-card-body {
  padding: var(--space-6);
  display: none;
}

.lesson-card.open .lesson-card-body {
  display: block;
}

.lesson-card.enrichment .lesson-card-header {
  background: linear-gradient(135deg, var(--color-teal), var(--color-teal-light));
}

/* --- Interactive Canvas Wrapper --- */
.canvas-wrapper {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin: var(--space-4) 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 300px;
  border: 2px dashed var(--color-border);
}

.canvas-wrapper canvas {
  border-radius: var(--radius-sm);
}

/* --- Exercise Card --- */
.exercise-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.exercise-card h3 {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.exercise-card .exercise-number {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-teal);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

/* --- Quiz UI --- */
.quiz-container {
  max-width: 700px;
  margin: 0 auto;
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.quiz-progress {
  flex: 1;
  height: 12px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 var(--space-4);
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-bounce);
}

.quiz-question-num {
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.quiz-score {
  font-weight: 700;
  color: var(--color-accent-dark);
  white-space: nowrap;
}

.quiz-question {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  text-align: center;
  margin-bottom: var(--space-6);
}

.quiz-question .question-text {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: var(--line-height);
}

.quiz-question .question-visual {
  margin-bottom: var(--space-6);
}

/* MCQ Options */
.quiz-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.quiz-option {
  padding: var(--space-4);
  border: 3px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-bounce);
  background: var(--color-surface);
  text-align: center;
}

.quiz-option:hover {
  border-color: var(--color-primary-light);
  background: var(--color-bg-alt);
  transform: scale(1.03);
}

.quiz-option.selected {
  border-color: var(--color-primary);
  background: var(--color-bg-alt);
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-light);
  animation: correctPop 0.4s var(--ease-bounce);
}

.quiz-option.wrong {
  border-color: var(--color-error);
  background: var(--color-error-light);
  animation: wrongShake 0.4s ease-out;
}

.quiz-option[disabled] {
  cursor: default;
  transform: none !important;
}

@keyframes correctPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* Fill-in-blank */
.quiz-input-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}

.quiz-input {
  padding: var(--space-3) var(--space-4);
  border: 3px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-xl);
  font-weight: 700;
  text-align: center;
  width: 200px;
  transition: border-color var(--duration-normal);
  outline: none;
}

.quiz-input:focus {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-glow);
}

.quiz-input.correct {
  border-color: var(--color-success);
  background: var(--color-success-light);
}

.quiz-input.wrong {
  border-color: var(--color-error);
  background: var(--color-error-light);
}

/* Quiz Feedback */
.quiz-feedback {
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  margin-top: var(--space-4);
  font-weight: 600;
  display: none;
}

.quiz-feedback.show {
  display: block;
}

.quiz-feedback.correct {
  background: var(--color-success-light);
  color: #166534;
  border: 2px solid var(--color-success);
}

.quiz-feedback.wrong {
  background: var(--color-error-light);
  color: #991B1B;
  border: 2px solid var(--color-error);
}

.quiz-feedback .hint {
  font-weight: 400;
  font-size: var(--text-sm);
  margin-top: var(--space-2);
  opacity: 0.9;
}

/* Quiz Results */
.quiz-results {
  text-align: center;
  padding: var(--space-8);
}

.quiz-results .score-display {
  font-size: var(--text-4xl);
  font-family: var(--font-heading);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.quiz-results .stars {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.quiz-results .result-message {
  font-size: var(--text-xl);
  color: var(--color-text-light);
  margin-bottom: var(--space-6);
}

/* --- Tier Selector --- */
.tier-selector {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  justify-content: center;
}

.tier-btn {
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 700;
  font-size: var(--text-base);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-bounce);
  border: 3px solid;
}

.tier-btn.explorer {
  border-color: var(--color-success);
  color: var(--color-success);
  background: var(--color-success-light);
}

.tier-btn.explorer.active,
.tier-btn.explorer:hover {
  background: var(--color-success);
  color: white;
}

.tier-btn.adventurer {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

.tier-btn.adventurer.active,
.tier-btn.adventurer:hover {
  background: var(--color-primary);
  color: white;
}

.tier-btn.champion {
  border-color: var(--color-accent-dark);
  color: var(--color-accent-dark);
  background: var(--color-accent-light);
}

.tier-btn.champion.active,
.tier-btn.champion:hover {
  background: var(--color-accent-dark);
  color: white;
}

.tier-btn.locked {
  opacity: 0.4;
  cursor: not-allowed;
}

.tier-btn.locked:hover {
  transform: none;
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(30, 27, 75, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 500px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--duration-slow) var(--ease-bounce);
}

.modal-overlay.show .modal {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  cursor: pointer;
}

/* --- Toast / Notification --- */
.toast-container {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.toast {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-6);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  min-width: 280px;
  animation: toastIn 0.4s var(--ease-bounce);
  border-left: 4px solid var(--color-primary);
}

.toast.success {
  border-left-color: var(--color-success);
}

.toast.error {
  border-left-color: var(--color-error);
}

.toast.xp {
  border-left-color: var(--color-accent);
}

.toast-icon {
  font-size: 1.5rem;
}

.toast-exit {
  animation: toastOut 0.3s var(--ease-smooth) forwards;
}

@keyframes toastIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes toastOut {
  to {
    transform: translateX(120%);
    opacity: 0;
  }
}

/* --- Progress Bar --- */
.progress-bar {
  height: 16px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--duration-slow) var(--ease-bounce);
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-purple {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

.badge-teal {
  background: #CCFBF1;
  color: var(--color-teal);
}

.badge-accent {
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
}

.badge-success {
  background: var(--color-success-light);
  color: #166534;
}

/* --- Number Display (for place value etc.) --- */
.number-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4);
}

.digit-box {
  width: 56px;
  height: 72px;
  border-radius: var(--radius-md);
  border: 3px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  font-family: var(--font-heading);
  color: var(--color-primary-dark);
  background: var(--color-surface);
  transition: all var(--duration-normal) var(--ease-bounce);
}

.digit-box.active {
  border-color: var(--color-primary);
  background: var(--color-bg-alt);
  box-shadow: var(--shadow-glow);
}

.digit-box.highlight-tl { border-color: #7C3AED; background: #EDE9FE; }
.digit-box.highlight-l { border-color: #EC4899; background: #FCE7F3; }
.digit-box.highlight-tth { border-color: #3B82F6; background: #DBEAFE; }
.digit-box.highlight-th { border-color: #0D9488; background: #CCFBF1; }
.digit-box.highlight-h { border-color: #F97316; background: #FFF7ED; }
.digit-box.highlight-t { border-color: #EAB308; background: #FEF9C3; }
.digit-box.highlight-o { border-color: #22C55E; background: #DCFCE7; }

.place-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-align: center;
  color: var(--color-text-light);
  margin-top: var(--space-1);
}

.comma-separator {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-light);
  align-self: center;
}

/* --- Comparison Symbols --- */
.compare-btn {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  border: 3px solid var(--color-border);
  font-size: var(--text-2xl);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-bounce);
  background: var(--color-surface);
  color: var(--color-primary);
}

.compare-btn:hover {
  border-color: var(--color-primary-light);
  background: var(--color-bg-alt);
  transform: scale(1.1);
}

.compare-btn.selected {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.compare-btn.correct {
  border-color: var(--color-success);
  background: var(--color-success);
  color: white;
}

.compare-btn.wrong {
  border-color: var(--color-error);
  background: var(--color-error);
  color: white;
}

/* --- Score Display --- */
.score-card {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.score-card .score-value {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
}

.score-card .score-label {
  font-size: var(--text-sm);
  opacity: 0.9;
}

/* --- Drag & Drop Zone --- */
.drop-zone {
  min-height: 80px;
  border: 3px dashed var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3);
  transition: all var(--duration-normal);
  flex-wrap: wrap;
}

.drop-zone.drag-over {
  border-color: var(--color-primary-light);
  background: var(--color-bg-alt);
}

.drop-zone.correct {
  border-color: var(--color-success);
  background: var(--color-success-light);
}

.draggable-item {
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: grab;
  font-weight: 700;
  font-size: var(--text-lg);
  user-select: none;
  transition: all var(--duration-fast);
}

.draggable-item:active {
  cursor: grabbing;
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
}

.draggable-item.placed {
  opacity: 0.5;
  cursor: default;
}

/* --- Page Header --- */
.page-header {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-text-inverse);
  padding: var(--space-8) 0;
  margin-bottom: var(--space-8);
}

.page-header h1 {
  color: var(--color-text-inverse);
  margin-bottom: var(--space-2);
}

.page-header p {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--text-lg);
  margin-bottom: 0;
}

.page-header .chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255, 255, 255, 0.2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--text-sm);
  margin-bottom: var(--space-3);
}

/* --- Confetti Canvas --- */
#confetti-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 3000;
}