.diff-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Scope control defaults without raising their specificity. */
:where(.repository-diff) button,
:where(.repository-diff) input,
:where(.repository-diff) select,
.diff-file-tools a {
  min-width: 0;
  border: 1px solid var(--control-border);
  border-radius: 4px;
  color: var(--fg-0);
  background: var(--bg-1);
}

:where(.repository-diff) button,
.diff-file-tools a {
  padding: 5px 9px;
  cursor: pointer;
  font-size: 12px;
  transition: background 140ms ease, border-color 140ms ease;
}

:where(.repository-diff) button:hover:not(:disabled),
.diff-file-tools a:hover {
  border-color: var(--action);
  background: var(--bg-3);
}

:where(.repository-diff) button:disabled {
  opacity: .45;
  cursor: default;
}
:where(.repository-diff) input,
:where(.repository-diff) select {
  padding: 7px 9px;
  font-size: 12px;
}
:where(.repository-diff) input::placeholder {
  color: var(--muted);
}
.diff-eyebrow {
  color: var(--muted);
  font: 11px/1.4 var(--font-mono);
  letter-spacing: .06em;
}
.repository-diff .added {
  color: var(--success-text);
}
.repository-diff .deleted {
  color: var(--danger-text);
}
.repository-diff .modified {
  color: var(--warning-text);
}

/* ---- Snapshot selectors ----------------------------------- */

.diff-selection {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
}

.diff-picker {
  position: relative;
  min-width: 0;
}
.diff-picker summary {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--control-border);
  border-radius: 4px;
  background: var(--bg-1);
  cursor: pointer;
  list-style: none;
}
.diff-picker summary::-webkit-details-marker {
  display: none;
}
.diff-picker summary:hover,
.diff-picker[open] summary {
  border-color: var(--action);
}
.diff-side {
  font: 18px/1 var(--font-mono);
}
.diff-side.a {
  color: var(--danger-text);
}
.diff-side.b {
  color: var(--success-text);
}
.diff-picker-copy {
  display: grid;
  flex: 1;
  min-width: 0;
  gap: 2px;
}
.diff-picker-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 500;
}
.diff-picker-id {
  color: var(--muted);
  font: 10px/1.4 var(--font-mono);
}
.diff-chevron {
  color: var(--muted);
}
.diff-swap {
  padding: 5px 0;
  font-size: 20px;
  border-color: transparent;
  background: transparent;
}
.diff-selection-actions {
  display: grid;
  gap: 6px;
}
.diff-compare {
  height: 38px;
  color: var(--link-text);
}
.diff-picker-menu {
  position: absolute;
  z-index: 60;
  inset: calc(100% + 6px) auto auto 0;
  width: max(100%, 340px);
  max-width: calc(100vw - 40px);
  padding: 10px;
  border: 1px solid var(--control-border);
  border-radius: 4px;
  background: var(--bg-0);
}
.diff-picker[data-picker="b"] .diff-picker-menu {
  left: auto;
  right: 0;
}
.diff-picker-menu > input,
.diff-picker-menu > select {
  display: block;
  width: 100%;
  margin-bottom: 8px;
}
.diff-snapshot-results {
  max-height: 300px;
  overflow: auto;
}
.diff-snapshot-option {
  display: grid;
  grid-template-rows: [description] auto [metadata] auto;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 3px 12px;
  width: 100%;
  padding: 9px 7px;
  border: 0;
  border-bottom: 1px solid var(--bg-3);
  border-radius: 0;
  background: transparent;
  text-align: left;
}
.diff-snapshot-option:has(.diff-snapshot-heads) {
  grid-template-rows: [heads] auto [description] auto [metadata] auto;
}
.diff-snapshot-option[aria-pressed="true"] {
  background: var(--bg-3);
}
.diff-snapshot-description {
  grid-column: 1;
  grid-row: description;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  overflow-wrap: anywhere;
  font-weight: 500;
  line-height: 1.4;
}
.diff-snapshot-option > .snapshot-credits { display: contents; }
.diff-snapshot-option .snapshot-credit {
  grid-column: 2;
  align-self: baseline;
  justify-content: flex-end;
  text-align: right;
}
.diff-snapshot-option .snapshot-credit:first-child {
  grid-row: description;
  align-self: end;
}
.diff-snapshot-option .snapshot-credit:last-child { grid-row: metadata; }
.diff-snapshot-option > .diff-snapshot-meta {
  grid-row: metadata;
  align-self: baseline;
}
.diff-snapshot-option > .diff-snapshot-heads {
  grid-column: 1 / -1;
  grid-row: heads;
}
.diff-snapshot-meta,
.diff-snapshot-heads {
  grid-column: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.diff-snapshot-meta {
  color: var(--muted);
  font: 10px/1.6 var(--font-mono);
}
.diff-snapshot-heads {
  color: var(--link-text);
  font: 10px/1.4 var(--font-mono);
}
.diff-picker-state {
  margin: 8px 0;
  color: var(--muted);
  font-size: 12px;
}
.diff-manual-id {
  display: grid;
  gap: 4px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--bg-3);
  color: var(--muted);
  font-size: 11px;
}
.diff-manual-id input {
  width: 100%;
  font: 11px/1.5 var(--font-mono);
}
.diff-summary {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  margin: 14px 0 10px;
}
.diff-summary p {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}
.diff-summary strong {
  font-weight: 500;
  color: var(--fg-1);
}
.diff-count {
  margin-left: 10px;
  white-space: nowrap;
}
.diff-summary button {
  flex-shrink: 0;
}
.diff-summary-actions {
  display: flex;
  flex-shrink: 0;
  gap: 7px;
}

/* ---- Maximized comparison --------------------------------- */

.diff-size-controls {
  flex: none;
  margin-left: auto;
}
.diff-size-controls .diff-size-button {
  width: 28px;
  height: 28px;
  padding: 4px;
  place-items: center;
}
.diff-size-button:not([hidden]) {
  display: grid;
}
.diff-panel > .diff-size-controls {
  align-self: flex-end;
  margin: 8px 10px;
}
.diff-size-button .lucide {
  display: block;
  width: 18px;
  height: 18px;
  color: var(--link-text);
}
html:has(.diff-maximized[open]) {
  scrollbar-gutter: auto;
}
.repository-page:has(.diff-maximized[open]) {
  overflow: hidden;
}
.diff-maximized {
  width: 100%;
  height: 100dvh;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--fg-0);
  background: var(--bg-0);
}
.diff-maximized[open] {
  display: flex;
  flex-direction: column;
}
.diff-maximized .diff-workspace {
  flex: 1;
  min-height: 0;
  height: auto;
  border: 0;
  border-radius: 0;
}

/* ---- File list and review pane ----------------------------- */

/* Reserve the same space for short files, long files and empty states. */
.diff-workspace,
.diff-initial {
  height: clamp(28rem, calc(100svh - 26rem), 56rem);
}
.diff-workspace {
  display: grid;
  grid-template-columns: var(--diff-sidebar-width, 230px) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  border: 1px solid var(--control-border);
  border-radius: 4px;
  background: var(--bg-1);
}
.diff-files-panel {
  position: relative;
  min-width: 0;
  min-height: 0;
  border-right: 1px solid var(--control-border);
}
.diff-files-panel > summary {
  display: none;
}
.diff-sidebar-resizer {
  display: none;
  position: absolute;
  z-index: 2;
  top: 0;
  right: -4px;
  bottom: 0;
  width: 8px;
  cursor: col-resize;
  touch-action: none;
}
.diff-sidebar-resizer::after {
  content: "";
  position: absolute;
  inset: 0 3px;
}
.diff-sidebar-resizer:focus-visible {
  outline: none;
}
.diff-sidebar-resizer:is(:hover, :focus-visible, .is-resizing)::after {
  background: var(--action);
}
@media (min-width: 761px) {
  .diff-enhanced .diff-sidebar-resizer {
    display: block;
  }
}
.diff-files-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
}
.diff-files-content > [data-file-list] {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}
.diff-file-filters {
  display: grid;
  flex-shrink: 0;
  gap: 7px;
  padding: 10px;
  border-bottom: 1px solid var(--bg-3);
}
.diff-enhanced .diff-filter-submit {
  display: none;
}
.diff-file-list {
  flex: 1;
  min-height: 0;
  overflow: auto;
  scrollbar-width: thin;
}
.diff-file {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-height: 34px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--bg-3);
  border-left: 2px solid transparent;
  font: 11px/1.5 var(--font-mono);
}
.diff-file:hover {
  background: var(--bg-3);
}
.diff-file[aria-current] {
  border-left-color: var(--action);
  background: var(--bg-3);
}
.diff-file-path {
  overflow-wrap: anywhere;
}
.diff-status {
  flex: none;
  font: 11px/1.5 var(--font-mono);
}
.diff-list-pages {
  display: flex;
  flex-shrink: 0;
  justify-content: space-between;
  gap: 10px;
  padding: 10px;
  font-size: 11px;
  color: var(--link-text);
}
.diff-list-pages:empty {
  display: none;
}
.diff-list-empty {
  padding: 8px 12px;
  color: var(--muted);
  font-size: 12px;
}
.diff-panel,
.diff-file-view {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}
.diff-file-view {
  flex: 1;
}
.diff-file-header {
  flex-shrink: 0;
  background: var(--bg-1);
  border-bottom: 1px solid var(--control-border);
}
.diff-file-heading {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 10px 12px 7px;
}
.diff-file-heading h2 {
  flex: 1;
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  font: 12px/1.5 var(--font-mono);
}
.diff-line-count {
  flex-shrink: 0;
  font: 11px/1.5 var(--font-mono);
}
.diff-file-tools {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  align-items: center;
  padding: 0 10px 9px;
}
.diff-file-tools button, .diff-file-tools a {
  padding: 4px 7px;
}
.diff-file-tools [data-wrap][aria-pressed="true"] {
  color: var(--button-text);
  background: var(--action);
  border-color: var(--action);
}
.diff-tool-group {
  display: flex;
  align-items: center;
  gap: 4px;
}
.diff-tool-label {
  padding: 0 3px;
  color: var(--muted);
  font: 10px/1.5 var(--font-mono);
  white-space: nowrap;
}
.diff-tools-spacer {
  flex: 1;
}
.diff-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  overflow: auto;
  padding: 48px 24px;
  color: var(--muted);
  text-align: center;
}
.diff-empty h2 {
  margin: 8px 0;
  color: var(--fg-0);
  font-size: 17px;
  font-weight: 500;
}
.diff-empty p {
  margin: 8px 0 14px;
  font-size: 13px;
}
.diff-initial {
  border: 1px solid var(--control-border);
  border-radius: 4px;
}
[data-diff-panel][aria-busy="true"], [data-file-list][aria-busy="true"] {
  opacity: .65;
}

/* ---- Full-file unified diff -------------------------------- */

.diff-viewport {
  color: var(--fg-0);
  background: var(--code-bg);
  position: relative;
  display: flex;
  flex: 1;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}
.diff-enhanced .diff-viewport {
  padding-right: 10px;
}
.diff-overview {
  position: absolute;
  top: 0;
  right: 0;
  width: 10px;
  height: 100%;
  visibility: hidden;
  pointer-events: none;
  background: var(--code-bg);
}
.diff-overview.is-visible {
  visibility: visible;
}
.diff-overview-deleted {
  fill: var(--danger-text);
}
.diff-overview-added {
  fill: var(--success-text);
}
.diff-scroll {
  flex: 1;
  min-width: 0;
  min-height: 0;
  overflow: auto;
  scrollbar-width: thin;
}
.diff-source {
  width: max-content;
  min-width: 100%;
  font: 12px/1.7 var(--font-mono);
  tab-size: 4;
}
.diff-line, .diff-column-labels {
  display: grid;
  grid-template-columns: 5ch 5ch 3ch minmax(0, 1fr);
}
.diff-column-labels {
  color: var(--muted);
  background: var(--code-bg);
  font-size: 10px;
  border-bottom: 1px solid var(--bg-3);
}
.diff-column-labels > span {
  padding: 4px 5px;
  text-align: right;
}
.diff-column-labels > span:last-child {
  text-align: left;
}
.diff-line code {
  display: block;
  padding: 0 12px 0 2px;
  white-space: pre;
  color: var(--fg-0);
  font: inherit;
}
.diff-number {
  padding-right: 6px;
  text-align: right;
  color: var(--muted);
  border-right: 1px solid color-mix(in srgb, var(--control-border) 22%, transparent);
  user-select: none;
  font-size: 10px;
}
a.diff-number:hover {
  color: var(--link-text);
  text-decoration: underline;
}
.diff-sign {
  text-align: center;
  user-select: none;
}
.diff-line.added {
  background: var(--diff-added);
}
.diff-line.deleted {
  background: var(--diff-deleted);
}
.diff-line mark {
  color: inherit;
  border-radius: 2px;
}
.diff-line.added mark {
  background: var(--diff-added-word);
}
.diff-line.deleted mark {
  background: var(--diff-deleted-word);
}
.diff-line:has(:target) {
  outline: 1px solid var(--link-text);
  outline-offset: -1px;
}
.diff-line[data-active-change] {
  box-shadow: inset 2px 0 var(--link-text);
}
.diff-eol {
  margin-left: 12px;
  color: var(--muted);
  font: 10px var(--font-mono);
  user-select: none;
}
.diff-source.is-wrapped {
  width: 100%;
}
.diff-source.is-wrapped code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

@media (max-width: 760px) {
  .diff-selection {
    grid-template-columns: minmax(0, 1fr) 30px minmax(0, 1fr);
    gap: 6px;
  }
  .diff-selection-actions {
    grid-column: 1 / -1;
    justify-self: end;
    display: flex;
    align-items: center;
  }
  .diff-picker summary {
    padding: 8px;
    gap: 7px;
  }
  .diff-summary {
    align-items: flex-start;
  }
  .diff-count {
    display: inline-block;
    margin-left: 6px;
  }
  .diff-workspace {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
  }
  .diff-files-panel {
    border-right: 0;
    border-bottom: 1px solid var(--control-border);
  }
  .diff-files-panel > summary {
    display: flex;
    gap: 8px;
    padding: 10px 12px;
    cursor: pointer;
    font-size: 12px;
  }
  .diff-files-panel > summary span:first-child {
    color: var(--muted);
  }
  .diff-files-panel > summary span:last-child {
    margin-left: auto;
  }
  .diff-files-content {
    position: static;
    height: 180px;
  }
  .diff-file-filters {
    grid-template-columns: minmax(0, 1fr) auto;
  }
  .diff-file-tools {
    gap: 5px;
  }
  .diff-source {
    font-size: 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  :where(.repository-diff) button, .diff-file-tools a {
    transition: none;
  }
}