/* ── Shape Library Sidebar ── */
#sidebar {
  display: flex;
  flex-direction: column;
  background: var(--site-surface);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--site-border);
  user-select: none;
  font-size: 12px;
  height: calc(100% - 32px);
  overflow: hidden;
  box-shadow: var(--site-shadow-floating);
  border-radius: var(--site-radius-lg);
}

/* Mobile tab bar — shown only at ≤900px (layout.css handles display:none / flex) */
.mobile-tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--site-text-secondary);
  border-radius: var(--site-radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.mobile-tab-btn.active {
  background: var(--site-surface-solid);
  color: var(--site-accent);
  box-shadow: var(--site-shadow-sm);
}

/* ── Search Box ── */
.sidebar-header {
  padding: 12px 14px;
  border-bottom: 1px solid var(--site-border);
  position: sticky;
  top: 0;
  background: transparent;
  z-index: 2;
  flex-shrink: 0;
}

.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: 7px 10px 7px 30px;
  border-radius: var(--site-radius-sm);
  font-size: 12px;
  font-family: var(--site-font);
  outline: none;
  transition: all 0.15s ease;
}

.search-box input:focus {
  border-color: var(--site-accent);
  box-shadow: 0 0 0 2px var(--site-border-focus);
}

.search-icon {
  position: absolute;
  left: 9px;
  color: var(--site-text-muted);
  pointer-events: none;
}

/* ── Shape Accordion Content ── */
.sidebar-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 12px 80px 12px; /* bottom padding for mobile dock */
  -webkit-overflow-scrolling: touch;
}

.shape-category {
  margin-bottom: 12px;
}

.category-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 6px;
  cursor: pointer;
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--site-text-muted);
  user-select: none;
  transition: color 0.15s ease;
}

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

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 4px 0 8px 0;
}

.shape-thumbnail {
  width: 100%;
  aspect-ratio: 1;
  background: var(--site-surface-solid);
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  color: var(--site-text);
  transition: all 0.15s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.shape-thumbnail:hover, .shape-thumbnail:active {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.2);
  border-color: var(--site-accent);
  color: var(--site-accent);
}

.shape-thumbnail svg {
  width: 32px;
  height: 32px;
  stroke: currentColor;
  stroke-width: 1.6;
  fill: none;
}

/* ── Tab views (shapes vs properties on mobile) ── */
#shapes-tab-view {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

#mobile-inspector-view {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 8px 0 80px 0;
}