/* Activity Builder — Styles */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f0f2f5;
  color: #333;
  height: 100vh;
  overflow: hidden;
}

#builder-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
#builder-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: #1a1a2e;
  color: #fff;
  flex-shrink: 0;
}

#builder-header h1 {
  font-size: 18px;
  font-weight: 600;
}

#header-actions {
  display: flex;
  gap: 8px;
}

/* Tabs */
#tab-nav {
  display: flex;
  background: #fff;
  border-bottom: 2px solid #e0e0e0;
  flex-shrink: 0;
  overflow-x: auto;
}

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: none;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  color: #666;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover {
  color: #333;
}

.tab-btn.active {
  color: #1976d2;
  border-bottom-color: #1976d2;
}

/* Tab content */
#tab-content {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.tab-panel {
  display: none;
  height: 100%;
  overflow-y: auto;
  padding: 20px;
}

.tab-panel.active {
  display: flex;
  flex-direction: column;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: #1976d2; color: #fff; }
.btn-primary:hover:not(:disabled) { background: #1565c0; }
.btn-secondary { background: #e0e0e0; color: #333; }
.btn-secondary:hover:not(:disabled) { background: #bdbdbd; }
.btn-accent { background: #2e7d32; color: #fff; }
.btn-accent:hover:not(:disabled) { background: #1b5e20; }
.btn-danger { background: #c62828; color: #fff; }
.btn-danger:hover:not(:disabled) { background: #b71c1c; }
.btn-small { padding: 6px 12px; font-size: 12px; }

/* Forms */
.form-section {
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.form-section h2 {
  font-size: 16px;
  margin-bottom: 16px;
  color: #1a1a1a;
  border-bottom: 1px solid #eee;
  padding-bottom: 8px;
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #555;
  margin-bottom: 4px;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: #1976d2;
  box-shadow: 0 0 0 2px rgba(25,118,210,0.15);
}

.form-group small {
  display: block;
  font-size: 12px;
  color: #999;
  margin-top: 2px;
}

.form-group input[readonly] {
  background: #f5f5f5;
  color: #888;
}

.form-row {
  display: flex;
  gap: 20px;
  margin-bottom: 14px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  cursor: pointer;
}

/* Toolbox tab layout */
#toolbox-layout {
  display: grid;
  grid-template-columns: 240px 300px 1fr;
  gap: 16px;
  height: 100%;
  min-height: 0;
}

#toolbox-categories,
#toolbox-blocks {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  overflow-y: auto;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

#toolbox-categories h2,
#toolbox-blocks h2 {
  font-size: 15px;
  margin-bottom: 12px;
}

#toolbox-category-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

#toolbox-preview-area {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
}

#toolbox-preview-area h2 {
  font-size: 15px;
  margin-bottom: 12px;
  flex-shrink: 0;
}

#toolbox-preview-workspace {
  flex: 1;
  min-height: 200px;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: background 0.1s;
}

.category-item:hover { background: #f5f5f5; }
.category-item.selected { background: #e3f2fd; }

.category-color {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  flex-shrink: 0;
}

.category-name {
  flex: 1;
  font-size: 14px;
}

.category-remove {
  background: none;
  border: none;
  color: #ccc;
  cursor: pointer;
  font-size: 14px;
  padding: 2px;
}

.category-remove:hover { color: #c62828; }

.search-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 13px;
  margin-bottom: 12px;
}

.search-input:focus {
  outline: none;
  border-color: #1976d2;
}

.block-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  font-size: 13px;
  border-radius: 4px;
}

.block-item:hover { background: #f9f9f9; }

.block-item input[type="checkbox"] {
  flex-shrink: 0;
}

.block-item label {
  cursor: pointer;
  flex: 1;
}

/* Workspace tab */
#workspace-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-shrink: 0;
}

#workspace-status {
  font-size: 13px;
  color: #666;
}

#starter-workspace {
  flex: 1;
  min-height: 400px;
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
}

/* Hints & Tests split layout */
#hints-layout,
#tests-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 16px;
  height: 100%;
  min-height: 0;
}

#hint-list-panel, #test-list-panel,
#hint-editor-panel, #test-editor-panel {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  overflow-y: auto;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

#hint-list-panel h2, #test-list-panel h2,
#hint-editor-panel h2, #test-editor-panel h2 {
  font-size: 15px;
  margin-bottom: 12px;
}

.list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 4px;
  font-size: 13px;
  transition: background 0.1s, box-shadow 0.1s;
}

.list-item:hover { background: #f5f5f5; }
.list-item.selected { background: #e3f2fd; }
.list-item-reorderable { cursor: grab; }
.list-item-reorderable.dragging {
  opacity: 0.55;
  cursor: grabbing;
}
.list-item-reorderable.drag-over-before {
  box-shadow: inset 0 3px 0 #1976d2;
}
.list-item-reorderable.drag-over-after {
  box-shadow: inset 0 -3px 0 #1976d2;
}

.list-item-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.list-item-remove {
  background: none;
  border: none;
  color: #ccc;
  cursor: pointer;
  font-size: 14px;
}

.list-item-remove:hover { color: #c62828; }

.placeholder-text {
  color: #999;
  font-style: italic;
  font-size: 14px;
}

/* Weight indicator */
#weight-indicator {
  margin-top: 12px;
  padding: 10px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
}

.weight-ok { background: #e8f5e9; color: #2e7d32; }
.weight-warn { background: #fff8e1; color: #f57f17; }
.weight-error { background: #ffebee; color: #c62828; }

/* Condition builder */
.condition-builder {
  background: #f9f9f9;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 12px;
  margin-top: 8px;
}

.condition-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.condition-row select,
.condition-row input {
  padding: 6px 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 13px;
}

.condition-nested {
  margin-left: 20px;
  border-left: 2px solid #1976d2;
  padding-left: 12px;
}

.pattern-builder {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pattern-builder-help,
.pattern-muted {
  font-size: 12px;
  color: #666;
  line-height: 1.5;
}

.pattern-builder-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.pattern-builder-status {
  font-size: 12px;
  color: #666;
}

.pattern-builder-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  align-content: start;
}

.pattern-workspace,
.pattern-inspector-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
}

.pattern-workspace {
  min-height: 420px;
  overflow: hidden;
}

.pattern-inspector {
  min-width: 0;
}

.pattern-inspector-card {
  max-width: 100%;
}

.pattern-inspector-card {
  padding: 12px;
}

.pattern-inspector-card h3 {
  font-size: 14px;
  margin-bottom: 10px;
}

.pattern-field-editor {
  border-top: 1px solid #eee;
  padding-top: 10px;
  margin-top: 10px;
}

.pattern-field-current {
  font-size: 12px;
  color: #666;
  margin: 6px 0 10px;
}

/* Preview tab */
#preview-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-shrink: 0;
}

.preview-note {
  font-size: 13px;
  color: #666;
  line-height: 1.5;
}

#preview-frame-container {
  flex: 1;
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
  min-height: 500px;
  background: #fff;
}

#preview-iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 1000;
  transition: opacity 0.3s, transform 0.3s;
}

.toast.hidden {
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
}

.toast-success { background: #2e7d32; color: #fff; }
.toast-error { background: #c62828; color: #fff; }
.toast-info { background: #1976d2; color: #fff; }

/* Inline editor for steps */
.step-item {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 6px;
}

.step-item input {
  flex: 1;
  padding: 6px 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 13px;
}

.step-item input:focus {
  outline: none;
  border-color: #1976d2;
}

.step-remove {
  background: none;
  border: none;
  color: #ccc;
  cursor: pointer;
  font-size: 16px;
}

.step-remove:hover { color: #c62828; }

/* Category editor modal (inline) */
.category-editor {
  background: #f9f9f9;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 12px;
  margin-top: 8px;
}

.category-editor .form-group {
  margin-bottom: 10px;
}

.color-picker-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.color-picker-row input[type="color"] {
  width: 40px;
  height: 32px;
  border: 1px solid #ddd;
  border-radius: 4px;
  cursor: pointer;
  padding: 2px;
}