$border-color: var(--border-medium-color, #e8ecf0);
$surface-color: var(--surface-color, #fff);
$accent-color: var(--bit-accent-color, #6c5ce7);
$text-primary: var(--on-surface-color, #1a1a2e);
$text-secondary: var(--on-surface-medium-color, #707279);
$text-muted: var(--on-background-medium-color, #a0aec0);

.rootLaneCompare {
  position: relative;
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

// --- Toolbar ---

.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  border-bottom: 1px solid $border-color;
  background: $surface-color;
  flex-shrink: 0;
}

.searchInput {
  width: 200px;
  padding: 5px 10px;
  border: 1px solid $border-color;
  border-radius: 6px;
  font-size: 12px;
  font-family: inherit;
  outline: none;
  color: $text-primary;
  background: $surface-color;
  transition: border-color 0.15s ease;

  &:focus {
    border-color: $accent-color;
  }

  &::placeholder {
    color: $text-muted;
  }
}

.toolbarGroup {
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbarLabel {
  font-size: 11px;
  color: $text-muted;
  margin-right: 2px;
}

.toolbarBtn {
  padding: 4px 10px;
  border: 1px solid $border-color;
  border-radius: 6px;
  background: $surface-color;
  font-size: 11px;
  font-family: inherit;
  color: $text-secondary;
  cursor: pointer;
  transition: all 0.15s ease;

  &:hover {
    background: rgba(0, 0, 0, 0.02);
  }
}

.toolbarBtnActive {
  background: rgba(108, 92, 231, 0.12);
  color: $accent-color;
  border-color: $accent-color;
  font-weight: 600;

  .toolbarBadge {
    background: rgba(108, 92, 231, 0.15);
    color: $accent-color;
  }
}

.toolbarCount {
  margin-left: auto;
  font-size: 11px;
  color: $text-muted;
}

.toolbarSeparator {
  width: 1px;
  height: 20px;
  background: $border-color;
  flex-shrink: 0;
}

.toolbarBadge {
  font-size: 10px;
  font-weight: 600;
  color: $text-muted;
  background: rgba(0, 0, 0, 0.06);
  padding: 0 5px;
  border-radius: 8px;
  margin-left: 2px;
}

.sidebarHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: $text-muted;
  border-bottom: 1px solid $border-color;
}

.sidebarCount {
  background: rgba(108, 92, 231, 0.08);
  color: $accent-color;
  padding: 1px 7px;
  border-radius: 10px;
  font-size: 11px;
}

.changeTagNew {
  color: var(--positive-color, #37b26c);
  background: rgba(55, 178, 108, 0.08);
}

// --- Layout ---

.layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.sidebar {
  width: 220px;
  min-width: 220px;
  border-right: 1px solid $border-color;
  background: var(--background-color, #fdfdff);
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebarGroupHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-size: 11px;
  font-weight: 600;
  color: $text-muted;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: rgba(0, 0, 0, 0.02);
  border-bottom: 1px solid $border-color;
  margin-top: 4px;

  &:first-child {
    margin-top: 0;
  }
}

.sidebarGroupCount {
  font-size: 10px;
  background: rgba(0, 0, 0, 0.04);
  padding: 0 5px;
  border-radius: 8px;
}

.sidebarItem {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 12px 7px 16px;
  border: none;
  border-left: 2px solid transparent;
  background: transparent;
  font-size: 12.5px;
  font-family: inherit;
  color: $text-primary;
  text-align: left;
  cursor: pointer;
  transition:
    background 0.1s ease,
    border-color 0.1s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.5;

  &:hover {
    background: rgba(0, 0, 0, 0.02);
  }
}

.sidebarItemActive {
  border-left-color: $accent-color;
  background: rgba(108, 92, 231, 0.05);
  color: $accent-color;
  font-weight: 500;
}

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

.sidebarEnvPlaceholder {
  display: inline-block;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.diffPane {
  flex: 1;
  // shrink below content width (default flex min-width:auto = min-content) so a wide diff scrolls
  // inside its own file body instead of forcing the whole page horizontally wider.
  min-width: 0;
  overflow-y: auto;
  background: var(--background-color, #f9fafb);
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.15) transparent;

  &::-webkit-scrollbar {
    width: 6px;
  }

  &::-webkit-scrollbar-track {
    background: transparent;
  }

  &::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 3px;

    &:hover {
      background: rgba(0, 0, 0, 0.25);
    }
  }

  // Tab visibility driven by `data-view-mode` on the pane. All `DeferredTab` siblings are mounted
  // simultaneously to preserve their internal query/state caches across mode switches; CSS hides
  // the ones that don't match the active view. Without this every tab stacked on top of each other,
  // which is what made code show aspect data, config show code, and so on.
  &[data-view-mode='code'] [data-tab-id]:not([data-tab-id='inline-code']) {
    display: none;
  }
  &[data-view-mode='preview'] [data-tab-id]:not([data-tab-id='inline-preview']) {
    display: none;
  }
  &[data-view-mode='dependencies'] [data-tab-id]:not([data-tab-id='inline-deps']) {
    display: none;
  }
  &[data-view-mode='tests'] [data-tab-id]:not([data-tab-id='inline-tests']) {
    display: none;
  }
  &[data-view-mode='config'] [data-tab-id]:not([data-tab-id='inline-config']) {
    display: none;
  }
  &[data-view-mode='docs'] [data-tab-id]:not([data-tab-id='inline-docs']) {
    display: none;
  }

  // Per-panel visibility driven by `data-view-mode` on the pane. Every component panel is mounted
  // regardless of the active view (the set is filtered by search only) so that switching modes never
  // remounts panels — it's just this attribute flip. CSS then hides panels that have no changes for
  // the active view, using the stable `data-has-*` attributes stamped in lane-compare.tsx. `tests` and
  // `api` show every panel (api filters in its own full-pane view), so they get no hide rule here.
  &[data-view-mode='code'] [data-component-id]:not([data-has-code]) {
    display: none;
  }
  &[data-view-mode='docs'] [data-component-id]:not([data-has-docs]) {
    display: none;
  }
  &[data-view-mode='preview'] [data-component-id]:not([data-has-preview]) {
    display: none;
  }
  &[data-view-mode='dependencies'] [data-component-id]:not([data-has-deps]) {
    display: none;
  }
  &[data-view-mode='config'] [data-component-id]:not([data-has-config]) {
    display: none;
  }

  // reveal the header note a view registered for the active view (e.g. the deps change tally in the
  // Dependencies view). The header itself is view-agnostic; the app names the view here.
  &[data-view-mode='dependencies'] [data-header-extra-view='dependencies'] {
    display: inline-flex;
  }
}

// A group with no panels visible in the active view. Hidden via a class (not removed from the tree)
// so its panels stay mounted and a later view switch is still a pure CSS flip.
// compound selector on purpose: the bare `.groupHidden { display: none }` was silently defeated by
// `.laneCompareGroup { display: grid }` below — same specificity, later in the file wins — so groups
// with zero visible components rendered as stray headers with a "0" badge.
.laneCompareGroup.groupHidden {
  display: none;
}

// --- Loading ---

.laneCompareLoading {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.laneCompareSkeleton {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

// shimmer rides a transform-animated pseudo-element over a static background: `transform` runs on
// the compositor, so many bars animate without any per-frame main-thread paint (animating
// `background-position` repaints every bar every frame and drops the page framerate).
.skeletonBar {
  position: relative;
  overflow: hidden;
  height: 12px;
  background: var(--surface-neutral-color, #f0f2f5);
  border-radius: 4px;

  &::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, $border-color, transparent);
    transform: translateX(-100%);
    animation: shimmer 1.5s ease-in-out infinite;
  }
}

@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}

// --- Groups ---

.laneCompareGroup {
  --group-header-height: 42px;

  // Hard width clamp: a single-column `minmax(0, 1fr)` grid forces every descendant (header +
  // component panels + their code diffs) to the group's own width, which is the pane width. A grid
  // item in a `minmax(0, ...)` track cannot be widened by its content, so a long code line can only
  // scroll inside its diff body — it can never widen a panel, the pane, or the page. This is applied
  // here (a confirmed pane-width block) because `contain: inline-size` lower down was defeated by the
  // `content-visibility`/context wrappers in between.
  display: grid;
  grid-template-columns: minmax(0, 1fr);

  &:not(:first-child) {
    margin-top: 8px;
  }

  // Containment for each component panel. A view-mode switch toggles `display` on heavy tab subtrees
  // (code diffs, dependency tables) inside every panel; without containment a single layout read —
  // e.g. the toolbar's toggle indicator measuring its own `offsetLeft` right after the switch — forces
  // the browser to synchronously re-lay-out the ENTIRE pane in one pass (the ~1.2s "forced reflow"
  // seen in the profiler). `content-visibility: auto` skips layout/paint for panels not near the
  // viewport and makes each panel a containment boundary, so the reflow only touches what's on screen.
  // `contain-intrinsic-size: auto <h>` keeps the scrollbar stable by remembering each panel's last
  // rendered height (falling back to the estimate before first render).
  [data-component-id] {
    content-visibility: auto;
    contain-intrinsic-size: auto 320px;
  }
}

.laneCompareGroupHeader {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: $text-muted;
  background: var(--background-color, #f9fafb);
  border-bottom: 1px solid $border-color;
  position: sticky;
  top: 0;
  z-index: 4;
}

.laneCompareGroupLabel {
  flex: 1;
}

.laneCompareGroupCount {
  font-weight: 500;
  color: $text-muted;
  font-size: 12px;
  background: rgba(0, 0, 0, 0.04);
  padding: 2px 8px;
  border-radius: 10px;
}

// --- Component Section ---

.inlineComponentSection {
  background: $surface-color;
  margin-bottom: 2px;
  &:last-child {
    margin-bottom: 0;
  }
}

.inlineComponentHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 16px;
  background: $surface-color;
  border-bottom: 1px solid $border-color;
  border-left: 3px solid $accent-color;
  position: sticky;
  top: 0;
  z-index: 3;
}

.inlineComponentHeaderSelected {
  background: rgba(108, 92, 231, 0.03);
}

.componentEnvIcon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border-radius: 4px;
}

.inlineComponentName {
  font-size: 13px;
  font-weight: 600;
  color: $text-primary;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.inlineComponentMeta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.inlineChangeTags {
  display: flex;
  gap: 4px;
}

.changeTag {
  font-size: 10px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.changeTagCode {
  color: $accent-color;
  background: rgba(108, 92, 231, 0.08);
}

.changeTagDeps {
  color: var(--warning-color, #d6a022);
  background: rgba(214, 160, 34, 0.08);
}

.inlineComponentVersions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.inlineVersionHash {
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--surface-neutral-color, #f6f8fa);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 11px;
  color: $text-secondary;
}

.inlineVersionArrow {
  color: $text-muted;
  font-size: 10px;
  opacity: 0.5;
}

.inlineComponentEmpty {
  padding: 16px;
  text-align: center;
  color: $text-muted;
  font-size: 12px;
  font-style: italic;
}

// --- Sections ---

.sectionHeader {
  display: flex;
  align-items: center;
  padding: 6px 16px;
  background: var(--surface-neutral-color, #f8f9fb);
  border-bottom: 1px solid $border-color;
}

.sectionLabel {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: $text-muted;
}

.newComponentBanner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: rgba(55, 178, 108, 0.04);
  border-bottom: 1px solid rgba(55, 178, 108, 0.1);
}

.newComponentLabel {
  font-size: 11px;
  font-weight: 600;
  color: var(--positive-color, #37b26c);
  background: rgba(55, 178, 108, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.newComponentNote {
  font-size: 11px;
  color: $text-muted;
  font-style: italic;
}

.depsSection {
  border-bottom: 1px solid $border-color;
}

// --- Legacy compat ---
.componentCompareContainer {
  height: auto;
}
.componentComparePanel {
  border-bottom: none;
}
.groupedComponentCompareContainer {
  padding: 0;
}
.changeTypeTitle {
  padding: 16px 0;
}
.fullScreenIcon {
  display: none;
}

.emptyState {
  display: flex;
  flex: 1 1 auto;
  min-height: 240px;
  align-items: center;
  justify-content: center;
}

// --- Blank state: comparison with no changes at all (replaces the entire compare body) ---

.blankState {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  // extra bottom padding pulls the hero slightly above true center — optically balanced
  padding: 48px 24px 96px;
  min-height: 0;
  overflow: auto;
}

.blankStateIcon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--success-color, #1a7f37) 8%, transparent);
  color: var(--success-color, #1a7f37);
  font-size: 26px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-bottom: 20px;
}

.blankStateTitle {
  font-size: 18px;
  font-weight: 600;
  color: $text-primary;
  margin-bottom: 8px;
}

.blankStateSubtitle {
  font-size: 14px;
  line-height: 1.55;
  color: $text-secondary;
  max-width: 480px;
}

.blankStateMeta {
  margin-top: 20px;
  font-size: 12px;
  color: $text-muted;
  letter-spacing: 0.01em;
}