.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--site-border);
  position: sticky;
  top: 0;
  background: var(--site-surface);
  z-index: 2;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box input {
  width: 100%;
  background: var(--site-bg);
  border: 1px solid var(--site-border);
  color: var(--site-text);
  padding: 6px 8px 6px 28px;
  border-radius: var(--site-radius);
  font-size: 12px;
  outline: none;
}

.search-box input:focus {
  border-color: var(--site-accent);
}

.search-icon {
  position: absolute;
  left: 8px;
  color: var(--site-text-muted);
  pointer-events: none;
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
}

.shape-category {
  border-bottom: 1px solid var(--site-border-light);
}

.category-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  color: var(--site-text-secondary);
  user-select: none;
}

.category-header:hover {
  background-color: var(--site-surface-hover);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 8px 12px 16px;
}

.shape-thumbnail {
  width: 100%;
  aspect-ratio: 1;
  background: var(--site-bg);
  border: 1px solid var(--site-border-light);
  border-radius: var(--site-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  color: var(--site-text);
  transition: all var(--transition);
}

.shape-thumbnail:hover {
  transform: scale(1.05);
  box-shadow: var(--site-shadow);
  border-color: var(--site-accent);
}

.shape-thumbnail svg {
  width: 40px;
  height: 40px;
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
}