/* ==========================================================================
   INTERACTIVE LESSON VIEW & WIDGETS
   ========================================================================== */

#view-lesson {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--bg-primary);
  position: relative;
}

.lesson-header {
  height: 64px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 2px solid var(--border-subtle);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.lesson-progress-bar-wrap {
  flex: 1;
  height: 16px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}

.lesson-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--brand-primary), #a3e635);
  border-radius: var(--radius-pill);
  transition: width 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lesson-score-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-aura);
  background: var(--bg-surface-elevated);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
}

/* Lesson Stage Content */
.lesson-stage {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.lesson-card {
  width: 100%;
  background: var(--bg-surface);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  gap: 20px;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.lesson-step-badge {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.5px;
  background: var(--brand-primary);
  color: #fff;
}

.lesson-step-badge.discover { background: #3b82f6; }
.lesson-step-badge.watch { background: #8b5cf6; }
.lesson-step-badge.practice { background: #10b981; }
.lesson-step-badge.challenge { background: #f59e0b; }

.lesson-prompt-title {
  font-size: 24px;
  font-family: var(--font-game);
  color: #fff;
  line-height: 1.3;
}

.lesson-explanation-text {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Interactive Interactive Widgets */
.interactive-widget-container {
  background: var(--bg-surface-elevated);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 180px;
}

/* 1. LEGO STUD ARRAY WIDGET */
.lego-array-widget {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.lego-brick-plate {
  display: inline-grid;
  gap: 4px;
  padding: 10px;
  background: var(--lego-red);
  border-radius: 8px;
  box-shadow: 0 6px 0 #990007, 0 10px 20px rgba(0, 0, 0, 0.4);
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.lego-stud {
  width: 32px;
  height: 32px;
  background: radial-gradient(circle at 35% 35%, #fff 10%, var(--lego-red) 60%, #990007 100%);
  border-radius: 50%;
  box-shadow: 0 3px 0 #770005, inset 0 1px 2px rgba(255, 255, 255, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.7);
  transition: transform 0.15s ease;
}

.lego-stud.active {
  background: radial-gradient(circle at 35% 35%, #fff 10%, var(--lego-yellow) 60%, #b45309 100%);
  box-shadow: 0 3px 0 #92400e;
  transform: scale(1.1);
}

/* 2. MINECRAFT CRAFTING GRID */
.minecraft-crafting-box {
  background: #c6c6c6;
  padding: 16px;
  border-radius: 4px;
  border: 4px solid #373737;
  border-top-color: #ffffff;
  border-left-color: #ffffff;
  display: flex;
  align-items: center;
  gap: 20px;
}

.minecraft-grid-3x3 {
  display: grid;
  grid-template-columns: repeat(3, 44px);
  grid-template-rows: repeat(3, 44px);
  gap: 4px;
  background: #8b8b8b;
  padding: 4px;
  border: 2px solid #373737;
}

.mc-slot {
  background: #8b8b8b;
  border: 2px solid #373737;
  border-top-color: #373737;
  border-left-color: #373737;
  border-bottom-color: #ffffff;
  border-right-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.mc-arrow {
  font-size: 28px;
  color: #373737;
}

.mc-result-slot {
  width: 56px;
  height: 56px;
  background: #8b8b8b;
  border: 3px solid #373737;
  border-bottom-color: #fff;
  border-right-color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

/* 3. ALGEBRA BALANCE SCALE */
.balance-scale-widget {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.scale-beam-container {
  width: 100%;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  position: relative;
  height: 120px;
}

.scale-beam {
  position: absolute;
  top: 30px;
  left: 10%;
  width: 80%;
  height: 8px;
  background: #94a3b8;
  border-radius: 4px;
  transform-origin: center center;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.scale-fulcrum {
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 40px solid #cbd5e1;
}

.scale-pan {
  width: 120px;
  min-height: 60px;
  background: rgba(30, 41, 59, 0.9);
  border: 2px solid var(--accent-gem);
  border-radius: 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px;
  z-index: 2;
}

.mystery-block {
  width: 36px;
  height: 36px;
  background: var(--lego-yellow);
  color: #000;
  font-family: var(--font-mono);
  font-weight: 800;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 3px 0 #b45309;
}

.weight-token {
  width: 32px;
  height: 32px;
  background: #38bdf8;
  color: #0f172a;
  font-family: var(--font-mono);
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

/* Question Option Cards */
.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  width: 100%;
}

.option-btn {
  background: var(--bg-surface-elevated);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  color: var(--text-main);
  font-family: var(--font-game);
  font-weight: 600;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-pressable);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.option-btn:hover {
  border-color: var(--accent-gem);
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-2px);
}

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

.option-btn.selected {
  border-color: var(--lego-yellow);
  background: rgba(255, 213, 0, 0.15);
  box-shadow: 0 0 15px rgba(255, 213, 0, 0.3);
}

.option-btn.correct {
  border-color: var(--brand-primary) !important;
  background: rgba(88, 204, 2, 0.25) !important;
  color: #a3e635;
}

.option-btn.wrong {
  border-color: #ef4444 !important;
  background: rgba(239, 68, 68, 0.25) !important;
  color: #fca5a5;
}

/* Number Input Pad */
.math-number-input-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
}

.math-number-input {
  width: 140px;
  height: 56px;
  background: var(--bg-surface-elevated);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  text-align: center;
  outline: none;
  transition: border-color 0.15s ease;
}

.math-number-input:focus {
  border-color: var(--accent-gem);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

/* Pixel Sidekick Bar */
.sidekick-bar {
  background: var(--bg-surface);
  border-top: 2px solid var(--border-subtle);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.sidekick-avatar {
  width: 48px;
  height: 48px;
  background: #334155;
  border: 2px solid var(--accent-gem);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  animation: floatHead 2s infinite ease-in-out;
}

@keyframes floatHead {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.sidekick-bubble {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border-bottom-left-radius: 4px;
  font-size: 14px;
  color: #e2e8f0;
  flex: 1;
}

.sidekick-bubble strong {
  color: var(--lego-yellow);
  margin-right: 6px;
}

/* Bottom Control Footer */
.lesson-footer {
  height: 80px;
  background: var(--bg-surface);
  border-top: 2px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  flex-shrink: 0;
}