:root {
  --c-command: var(--vscode-charts-blue, #3794ff);
  --c-option: var(--vscode-charts-orange, #d18616);
  --c-argument: var(--vscode-charts-green, #89d185);
  --c-operator: var(--vscode-charts-purple, #b180d7);
  --c-redirect: var(--vscode-charts-yellow, #cca700);
  --c-variable: var(--vscode-charts-red, #f14c4c);
  --c-muted: var(--vscode-descriptionForeground, #888);
}

body {
  font-family: var(--vscode-font-family);
  font-size: var(--vscode-font-size);
  color: var(--vscode-foreground);
  padding: 0.5rem 1rem 2rem;
  line-height: 1.5;
}

header {
  color: var(--c-muted);
  margin-bottom: 0.5rem;
}

#where {
  font-weight: 600;
  color: var(--vscode-foreground);
}

pre#line {
  font-family: var(--vscode-editor-font-family);
  font-size: var(--vscode-editor-font-size);
  background: var(--vscode-textCodeBlock-background, rgba(127, 127, 127, 0.1));
  padding: 0.6rem 0.8rem;
  border-radius: 4px;
  overflow-x: auto;
  white-space: pre;
  margin: 0 0 0.75rem;
}

.seg {
  border-bottom: 2px solid currentColor;
  cursor: pointer;
  border-radius: 2px;
}

.seg.active {
  background: var(--vscode-editor-findMatchHighlightBackground, rgba(234, 92, 0, 0.33));
}

.note {
  margin: 0 0 0.5rem;
  padding: 0.3rem 0.6rem;
  border-left: 3px solid var(--vscode-textBlockQuote-border, #888);
  background: var(--vscode-textBlockQuote-background, transparent);
}

ul {
  list-style: none;
  margin: 0;
  padding-left: 1.1rem;
}

ul#tree {
  padding-left: 0;
}

.row {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.15rem 0.4rem;
  border-left: 3px solid currentColor;
  margin: 0.15rem 0;
  border-radius: 2px;
  cursor: pointer;
}

.row .text {
  color: var(--vscode-foreground);
}

.row.active {
  background: var(--vscode-list-hoverBackground);
}

.label {
  font-family: var(--vscode-editor-font-family);
  white-space: pre;
  flex: 0 0 auto;
  max-width: 45%;
  overflow: hidden;
  text-overflow: ellipsis;
}

code {
  font-family: var(--vscode-editor-font-family);
}

.text code {
  background: var(--vscode-textCodeBlock-background, rgba(127, 127, 127, 0.15));
  padding: 0 0.25em;
  border-radius: 3px;
}

.kind-command, .kind-builtin, .kind-function { color: var(--c-command); }
.kind-option { color: var(--c-option); }
.kind-argument, .kind-string, .kind-number { color: var(--c-argument); }
.kind-operator, .kind-keyword, .kind-block, .kind-test { color: var(--c-operator); }
.kind-redirect, .kind-pattern { color: var(--c-redirect); }
.kind-variable, .kind-expansion, .kind-substitution, .kind-assignment { color: var(--c-variable); }
.kind-comment { color: var(--c-muted); }
.kind-error { color: var(--vscode-errorForeground, #f14c4c); }

#empty {
  color: var(--c-muted);
}

.example {
  margin-top: 1rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--vscode-panel-border, rgba(127, 127, 127, 0.3));
}

.example h3 {
  font-size: 1em;
  margin: 0 0 0.4rem;
}

.example-label {
  color: var(--c-muted);
  font-size: 0.9em;
  margin: 0.4rem 0 0.15rem;
}

.example pre {
  font-family: var(--vscode-editor-font-family);
  font-size: var(--vscode-editor-font-size);
  background: var(--vscode-textCodeBlock-background, rgba(127, 127, 127, 0.1));
  padding: 0.4rem 0.7rem;
  border-radius: 4px;
  margin: 0;
  overflow-x: auto;
  white-space: pre;
}

.example pre.example-empty {
  color: var(--c-muted);
  font-style: italic;
}

/* An example placed under its token: indented with the token's children, set off by a left rule. */
.example.nested {
  margin: 0.3rem 0 0.5rem 1.2rem;
  padding: 0.1rem 0 0.1rem 0.7rem;
  border-top: none;
  border-left: 2px solid var(--vscode-panel-border, rgba(127, 127, 127, 0.3));
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.3rem 0.8rem;
  position: sticky;
  top: 0;
  z-index: 1;
  padding: 0.3rem 0;
  background: var(--vscode-editor-background);
}

.tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem 0.6rem;
}

.tools button {
  background: none;
  border: none;
  padding: 0.1rem 0.3rem;
  color: var(--vscode-textLink-foreground);
  font: inherit;
  cursor: pointer;
}

.tools button:hover {
  color: var(--vscode-textLink-activeForeground);
  text-decoration: underline;
}

.tools label {
  color: var(--c-muted);
}

.tools select {
  background: var(--vscode-dropdown-background);
  color: var(--vscode-dropdown-foreground);
  border: 1px solid var(--vscode-dropdown-border, transparent);
  font: inherit;
  padding: 0 0.2rem;
}

/* Folding: the twisty, and a collapsed item's children. */
.twisty {
  flex: 0 0 0.8em;
  color: var(--c-muted);
  user-select: none;
}

li.collapsed > ul,
li.collapsed > .example {
  display: none;
}

/* Capture groups: the same colour for the group in the tree and what it matched in the examples. */
.grp-1 { --grp: var(--vscode-charts-blue, #3794ff); }
.grp-2 { --grp: var(--vscode-charts-green, #89d185); }
.grp-3 { --grp: var(--vscode-charts-orange, #d18616); }
.grp-4 { --grp: var(--vscode-charts-purple, #b180d7); }
.grp-5 { --grp: var(--vscode-charts-yellow, #cca700); }
.grp-6 { --grp: var(--vscode-charts-red, #f14c4c); }

.grp-label {
  border-bottom: 2px solid var(--grp);
}

.match {
  background: var(--vscode-editor-findMatchHighlightBackground, rgba(234, 92, 0, 0.33));
  border-radius: 2px;
}

.match.grp {
  background: color-mix(in srgb, var(--grp) 35%, transparent);
}

/* The example input: a transparent textarea over a layer showing the same text with highlights. */
.editor {
  position: relative;
}

.editor .layer,
.editor textarea {
  font-family: var(--vscode-editor-font-family);
  font-size: var(--vscode-editor-font-size);
  line-height: 1.5;
  padding: 0.4rem 0.7rem;
  margin: 0;
  border-radius: 4px;
  white-space: pre-wrap;
  word-break: break-all;
  tab-size: 8;
}

.editor .layer {
  background: var(--vscode-textCodeBlock-background, rgba(127, 127, 127, 0.1));
  color: var(--vscode-editor-foreground);
  border: 1px solid transparent;
  overflow: hidden;
}

.editor textarea {
  position: absolute;
  inset: 0;
  width: 100%;
  box-sizing: border-box;
  background: transparent;
  color: transparent;
  caret-color: var(--vscode-editor-foreground);
  border: 1px dashed var(--vscode-input-border, rgba(127, 127, 127, 0.4));
  resize: none;
  overflow: hidden;
  outline: none;
}

.editor textarea:focus {
  border: 1px solid var(--vscode-focusBorder);
}

.hint {
  font-size: 0.9em;
  opacity: 0.8;
}

/* Quick reference. */
#reference h3 {
  font-size: 1em;
  margin: 1rem 0 0.3rem;
}

#ref-search {
  width: 100%;
  box-sizing: border-box;
  padding: 0.3rem 0.5rem;
  margin: 0.4rem 0;
  background: var(--vscode-input-background);
  color: var(--vscode-input-foreground);
  border: 1px solid var(--vscode-input-border, transparent);
  font: inherit;
}

.ref-row {
  display: flex;
  gap: 0.8rem;
  padding: 0.1rem 0.4rem;
}

.ref-row code {
  flex: 0 0 auto;
  min-width: 9em;
  color: var(--c-command);
}

.ref-row span code {
  background: var(--vscode-textCodeBlock-background, rgba(127, 127, 127, 0.15));
  padding: 0 0.25em;
  border-radius: 3px;
}