/* css/components.css - UI Components, Graph Studio, Scratchpad & Keypad */

/* Navigation Active Tab Styling */
.nav-tab-btn {
  position: relative;
  transition: all 0.2s ease;
}
.nav-tab-btn.active {
  background: var(--bg-surface);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan);
}
.nav-tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 20%;
  right: 20%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-gold));
  border-radius: 3px;
}
/* Primary grouped nav — larger hit area for 7th graders */
.nav-primary { min-height: 42px; }
.practice-subtab.active { box-shadow: var(--shadow-glow-cyan); }
/* Ensure all interactive controls meet 44px tap target on mobile */
@media (max-width: 768px) {
  .nav-tab-btn, .primary-learning-btn, .secondary-learning-btn, .math-key-btn { min-height: 44px; }
}

/* Virtual Math Keypad */
.math-key-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  font-size: 0.95rem;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  transition: all 0.15s ease;
  user-select: none;
}
.math-key-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-1px);
}
.math-key-btn:active {
  transform: translateY(1px);
}

/* Canvas Scratchpad */
.scratchpad-container {
  position: relative;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  overflow: hidden;
}
#scratchpad-canvas {
  width: 100%;
  height: 280px;
  cursor: crosshair;
  touch-action: none;
  display: block;
}

.scratchpad-toolbar .tool-btn {
  padding: 0.35rem 0.6rem;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  transition: all 0.15s;
}
.scratchpad-toolbar .tool-btn:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

.sp-color-chip {
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.sp-color-chip:hover {
  transform: scale(1.2);
}
.sp-color-chip.active-color {
  border-color: #FFFFFF;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
  transform: scale(1.25);
}

/* Step Derivation Items */
.step-item {
  border-left: 3px solid var(--border-color);
  transition: all 0.2s ease;
}
.step-item.valid {
  border-left-color: var(--accent-emerald);
  background: rgba(6, 214, 160, 0.06);
}
.step-item.error {
  border-left-color: var(--accent-rose);
  background: rgba(239, 71, 111, 0.08);
}
.step-item.active-step {
  border-left-color: var(--accent-cyan);
  background: rgba(72, 202, 228, 0.08);
}

/* Word Problem Sentence Highlighter */
.parsed-chunk {
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-block;
  margin: 1px;
}
.parsed-chunk:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}
.chunk-given {
  background-color: rgba(72, 202, 228, 0.25);
  border-bottom: 2px solid var(--accent-cyan);
  color: var(--text-primary);
}
.chunk-unknown {
  background-color: rgba(255, 209, 102, 0.25);
  border-bottom: 2px solid var(--accent-gold);
  color: var(--text-primary);
}
.chunk-constraint {
  background-color: rgba(167, 139, 250, 0.25);
  border-bottom: 2px solid var(--accent-purple);
  color: var(--text-primary);
}

/* Skill Tree Node Visualizer */
.skill-node {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 1rem;
  transition: all 0.25s ease;
  position: relative;
}
.skill-node.mastered {
  border-color: var(--accent-emerald);
  box-shadow: var(--shadow-glow-emerald);
}
.skill-node.in-progress {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan);
}
.skill-node.locked {
  opacity: 0.6;
  filter: grayscale(0.7);
}
.skill-node:hover:not(.locked) {
  transform: translateY(-3px);
  border-color: var(--accent-gold);
}

/* Graph Canvas Container (Mini-Graph & Full Graph Studio) */
#graph-canvas {
  width: 100%;
  height: 240px;
  background: var(--bg-input);
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  cursor: crosshair;
  display: block;
}

#graph-studio-canvas {
  width: 100%;
  height: 340px;
  background: var(--bg-input);
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  cursor: crosshair;
  display: block;
}

/* Graph Studio Mode Buttons */
.gs-type-btn {
  user-select: none;
  cursor: pointer;
}
.gs-type-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
}
.gs-type-btn.active {
  box-shadow: var(--shadow-glow-cyan);
}

/* Achievement Badges */
.badge-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  transition: all 0.2s;
}
.badge-card.unlocked {
  border-color: var(--accent-gold);
  background: linear-gradient(145deg, var(--bg-surface), rgba(255, 209, 102, 0.08));
}
.badge-card.locked {
  opacity: 0.5;
  filter: grayscale(0.8);
}