/* ===== MOLECUULBOUWER - builder.css ===== */

/* 1. Mount container */
#builder-mount {
  width: 100%;
}

/* 2. Wrapper: palette links, canvas rechts */
.builder-wrapper {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}

/* 3. Palette */
.builder-palette {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  width: 100%;
}

/* Section labels removed for cleaner look */

.atom-tile,
.bond-tile {
  width: 76px;
  height: auto;
  padding: 12px 6px;
  border-radius: var(--radius-md, 12px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: grab;
  user-select: none;
  border: 1px solid transparent;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  gap: 2px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.atom-tile span:first-child,
.bond-tile span:first-child {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
}

.atom-tile {
  background: var(--card-bg, #FFFFFF);
  color: var(--primary, #3B82F6);
  border-color: var(--border-color, #E2E8F0);
}

.bond-tile {
  background: var(--card-bg, #FFFFFF);
  color: var(--warning, #F59E0B);
  border-color: var(--border-color, #E2E8F0);
  font-size: 1.3rem;
}

.atom-tile:hover,
.bond-tile:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.08);
  border-color: var(--text-muted, #94A3B8);
}

.atom-tile:active,
.bond-tile:active {
  cursor: grabbing;
}

.bond-tile.selected {
  border-color: var(--primary, #2563EB);
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.tile-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted, #64748B);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1;
  margin-top: 4px;
}

/* 4. Canvas wrapper */
.builder-canvas-wrapper {
  width: 100%;
  max-width: 700px; 
  border: 2px dashed var(--border-color, #CBD5E1);
  border-radius: var(--radius-lg, 16px);
  background-color: var(--card-bg, #FFFFFF);
  background-image: radial-gradient(circle, var(--text-muted, #CBD5E1) 1px, transparent 1px);
  background-size: 20px 20px;
  background-position: center;
  min-height: 400px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, border-width 0.1s, background-color 0.3s;
}

.builder-canvas-wrapper.canvas-correct {
  border: 3px solid var(--success, #16A34A);
  background-image: radial-gradient(circle, rgba(22, 163, 74, 0.1) 1px, transparent 1px);
}

.builder-canvas-wrapper.canvas-incorrect {
  border: 3px solid var(--danger, #DC2626);
  background-image: radial-gradient(circle, rgba(220, 38, 38, 0.1) 1px, transparent 1px);
}

/* 5a. Hulpknop (?) */
#btn-builder-help {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border-color, #CBD5E1);
  background: var(--card-bg, rgba(255,255,255,0.92));
  color: var(--text-muted, #64748B);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 11;
  transition: all 0.2s;
  padding: 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

#btn-builder-help:hover {
  background: var(--bg-color, #EFF6FF);
  border-color: var(--primary, #93C5FD);
  color: var(--primary, #1D4ED8);
  transform: scale(1.05);
}

#btn-builder-help.active {
  background: var(--primary, #1D4ED8);
  border-color: var(--primary, #1D4ED8);
  color: white;
}

/* 5b. Uitlegpaneel */
#builder-help-panel {
  display: none;
  background: var(--bg-color, #F0F9FF);
  border: 1px solid var(--border-color, #BAE6FD);
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--text-main, #0C4A6E);
  line-height: 1.5;
  margin-top: 10px;
}

#builder-help-panel.open {
  display: block;
}

.bh-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color, #BAE6FD);
}

.bh-row:last-child {
  border-bottom: none;
}

.bh-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.bh-sub {
  color: var(--primary, #0369A1);
  font-size: 0.82rem;
}

/* 5d. Prullenbak */
#builder-trash {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--card-bg, rgba(241, 245, 249, 0.85));
  border: 2px dashed var(--border-color, #CBD5E1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  line-height: 1;
  pointer-events: none;     /* geen interferentie met drag */
  opacity: 0;               /* onzichtbaar in rust */
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 10;
  user-select: none;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Zichtbaar zodra een atoom gesleept wordt */
#builder-trash.drag-active {
  opacity: 1;
  transform: translateY(0);
}

/* Cursor zweeft boven de prullenbak → rood */
#builder-trash.will-delete {
  opacity: 1;
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--danger, #DC2626);
  border-style: solid;
  transform: scale(1.15);
  color: var(--danger, #DC2626);
}

/* 5. SVG canvas */
#builder-svg {
  width: 100%;
  height: 100%;
  min-height: 400px;
  display: block;
  cursor: default;
}

/* 6. Atom nodes */
.atom-node {
  cursor: pointer;
}

.atom-node circle.atom-body {
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.25));
}

.atom-node.atom-selected circle.atom-body {
  stroke: var(--primary, #3B82F6);
  stroke-width: 4px;
  filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.5));
}

.atom-node text {
  pointer-events: none;
  dominant-baseline: central;
  text-anchor: middle;
  font-family: inherit;
  font-weight: 700;
}

/* Hit target (invisible, larger circle) */
.atom-node circle.atom-hit {
  fill: transparent;
  stroke: none;
}

/* 7. Bond groups */
.bond-group {
  cursor: pointer;
}

.bond-group line {
  transition: stroke 0.2s;
}

.bond-group:hover line {
  stroke: var(--primary, #3B82F6) !important;
  filter: drop-shadow(0 0 4px rgba(59, 130, 246, 0.4));
}

/* Invisible wider stroke for easier clicking */
.bond-hit {
  stroke: transparent;
  stroke-width: 16px;
  fill: none;
}

/* 8. Drag ghost (touch) */
#drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  opacity: 0.8;
  transform: translate(-50%, -50%);
}

/* 9. Actions bar */
.builder-actions {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* 10. Inline feedback */
.builder-feedback {
  margin-top: 10px;
  padding: 0;
  min-height: 0;
  font-size: 0.95rem;
  transition: padding 0.15s;
}

.builder-feedback:not(:empty) {
  padding: 10px 14px;
  border-radius: 6px;
}

.builder-feedback.correct {
  background: #F0FDF4;
  color: #15803D;
  border-left: 4px solid #16A34A;
}

.builder-feedback.incorrect {
  background: #FEF2F2;
  color: #B91C1C;
  border-left: 4px solid #DC2626;
}

.builder-feedback.info {
  background: #EFF6FF;
  color: #1D4ED8;
  border-left: 4px solid #3B82F6;
}

/* 11. Disabled state */
.builder-wrapper.builder-disabled .atom-tile,
.builder-wrapper.builder-disabled .bond-tile {
  cursor: not-allowed;
  opacity: 0.5;
  pointer-events: none;
}

.builder-wrapper.builder-disabled #builder-svg {
  cursor: default;
  pointer-events: none;
}

/* 12. Responsive: palette boven canvas op smal scherm */
@media (max-width: 560px) {
  .builder-wrapper {
    flex-direction: column;
  }

  .builder-palette {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
    min-width: unset;
    width: 100%;
  }

  .palette-section-label {
    width: 100%;
  }

  .atom-tile,
  .bond-tile {
    width: 64px;
    padding: 8px 4px;
  }

  .builder-canvas-wrapper {
    min-width: unset;
    width: 100%;
  }

  #builder-svg {
    min-height: 300px;
  }
}

/* ── Atoomteller ─────────────────────────────────── */
.atom-counter-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 6px;
}

.counter-btn {
  width: 24px;
  height: 24px;
  border: 1px solid var(--border-color, #CBD5E1);
  border-radius: 6px;
  background: var(--bg-color, #F8FAFC);
  color: var(--text-main, #374151);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 0;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
  -webkit-user-select: none;
}

.counter-btn:hover {
  background: var(--card-bg, #FFFFFF);
  border-color: var(--text-muted, #94A3B8);
  transform: scale(1.05);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.counter-btn:active {
  transform: scale(0.95);
  background: var(--border-color, #E2E8F0);
}

.counter-value {
  min-width: 18px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main, #1F2937);
  user-select: none;
}

/* Eindbaas-melding boven het palet */
.builder-eindbaas-melding {
  background: rgba(245, 158, 11, 0.15);
  border-left: 3px solid var(--warning, #F59E0B);
  padding: 8px 12px;
  font-size: 0.85rem;
  color: var(--text-main, #92400E);
  border-radius: 4px;
  margin-bottom: 10px;
  width: 100%;
  box-sizing: border-box;
}