:root {
  color-scheme: light;
  --canvas-default: #f6f8fa;
  --canvas-subtle: #f6f8fa;
  --canvas-inset: #eff2f5;
  --surface: #ffffff;
  --fg-default: #1f2328;
  --fg-muted: #59636e;
  --border-default: #d0d7de;
  --border-muted: #d8dee4;
  --accent-fg: #0969da;
  --accent-emphasis: #0969da;
  --accent-muted: #ddf4ff;
  --success-fg: #1a7f37;
  --success-muted: #dafbe1;
  --attention-fg: #9a6700;
  --attention-muted: #fff8c5;
  --danger-fg: #cf222e;
  --danger-muted: #ffebe9;
  --shadow-small: 0 1px 0 rgba(31, 35, 40, 0.04);
  --shadow-medium: 0 3px 6px rgba(140, 149, 159, 0.15);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 1040px;
  margin: 0;
  background: var(--canvas-default);
  color: var(--fg-default);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
}

body.page-compare {
  min-width: 1180px;
}

a {
  color: var(--accent-fg);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button,
select {
  font: inherit;
}

button {
  min-height: 32px;
  padding: 5px 12px;
  border: 1px solid rgba(31, 35, 40, 0.15);
  border-radius: 6px;
  background: var(--canvas-subtle);
  box-shadow: var(--shadow-small);
  color: var(--fg-default);
  cursor: pointer;
  font-weight: 600;
}

button:hover:not(:disabled) {
  background: #f3f4f6;
  border-color: rgba(31, 35, 40, 0.25);
}

button:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent-fg);
  outline-offset: 2px;
}

button:disabled {
  color: #8c959f;
  cursor: not-allowed;
  opacity: 0.65;
}

select {
  width: 100%;
  min-height: 36px;
  padding: 5px 32px 5px 10px;
  border: 1px solid var(--border-default);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
  color: var(--fg-default);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border-default);
  background: rgba(246, 248, 250, 0.96);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
  color: var(--fg-default);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-subtitle {
  color: var(--fg-muted);
  font-size: 0.84rem;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.top-nav a {
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--fg-default);
  font-weight: 600;
}

.top-nav a:hover {
  background: rgba(208, 215, 222, 0.35);
  text-decoration: none;
}

.readme-layout {
  max-width: 1040px;
  margin: 0 auto;
}

.readme-layout .content {
  padding: 48px 44px 80px;
}

.docs-layout {
  display: grid;
  grid-template-columns: 268px minmax(0, 860px) 220px;
  justify-content: center;
  min-height: calc(100vh - 57px);
}

.docs-layout .content {
  min-width: 0;
  padding: 42px 48px 80px;
  background: var(--surface);
}

.compare-layout {
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr);
  min-height: calc(100vh - 57px);
}

.version-sidebar,
.file-sidebar,
.toc-sidebar {
  position: sticky;
  top: 57px;
  align-self: start;
  height: calc(100vh - 57px);
  overflow: auto;
}

.version-sidebar,
.file-sidebar {
  padding: 24px 16px;
  border-right: 1px solid var(--border-default);
  background: var(--surface);
}

.toc-sidebar {
  padding: 30px 20px;
  border-left: 1px solid var(--border-muted);
}

.sidebar-title,
.eyebrow,
.summary-label {
  margin: 0;
  color: var(--fg-muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.version-nav,
.toc-nav {
  display: grid;
  gap: 3px;
  margin-top: 10px;
}

.version-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1px 8px;
  padding: 8px 9px;
  border-radius: 6px;
  color: var(--fg-default);
}

.version-link:hover,
.version-link[aria-current="page"] {
  background: var(--canvas-inset);
  text-decoration: none;
}

.version-link[aria-current="page"] {
  box-shadow: inset 2px 0 var(--accent-fg);
}

.version-link-id {
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.version-link-title {
  overflow: hidden;
  color: var(--fg-muted);
  font-size: 0.75rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.version-link .status {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  color: var(--fg-muted);
  font-size: 0.66rem;
}

.version-link .status.planned {
  color: var(--attention-fg);
}

.toc-nav a {
  padding: 5px 8px;
  border-left: 2px solid transparent;
  color: var(--fg-muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.toc-nav a:hover {
  border-left-color: var(--accent-fg);
  color: var(--accent-fg);
  text-decoration: none;
}

.doc {
  min-width: 0;
}

.home-doc {
  padding: 32px 40px 44px;
  border: 1px solid var(--border-default);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
}

.doc h1,
.doc h2,
.doc h3 {
  font-weight: 600;
  line-height: 1.25;
}

.doc h1 {
  margin: 0 0 16px;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border-muted);
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.doc h2 {
  margin: 32px 0 16px;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border-muted);
  font-size: 1.5rem;
}

.doc h3 {
  margin: 24px 0 12px;
  font-size: 1.2rem;
}

.doc p {
  margin: 0 0 16px;
}

.doc ul,
.doc ol {
  margin: 0 0 16px;
  padding-left: 2em;
}

.doc li + li {
  margin-top: 0.25em;
}

.doc code {
  padding: 0.2em 0.4em;
  border-radius: 6px;
  background: rgba(175, 184, 193, 0.2);
  font-family: var(--font-mono);
  font-size: 85%;
}

.doc pre {
  overflow: auto;
  padding: 16px;
  border-radius: 6px;
  background: var(--canvas-subtle);
  font-size: 85%;
  line-height: 1.45;
}

.doc pre code {
  padding: 0;
  background: transparent;
  font-size: inherit;
}

.lede {
  max-width: 780px;
  color: var(--fg-muted);
  font-size: 1rem;
}

.doc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 28px;
}

.action-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 5px 14px;
  border: 1px solid rgba(31, 35, 40, 0.15);
  border-radius: 6px;
  box-shadow: var(--shadow-small);
  font-weight: 600;
}

.action-link {
  border-color: rgba(9, 105, 218, 0.75);
  background: var(--accent-emphasis);
  color: #fff;
}

.action-link:hover {
  background: #0860ca;
  text-decoration: none;
}

.secondary-link {
  background: var(--canvas-subtle);
  color: var(--fg-default);
}

.secondary-link:hover {
  background: #f3f4f6;
  text-decoration: none;
}

.version-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.version-card {
  display: grid;
  gap: 8px;
  min-height: 148px;
  padding: 16px;
  border: 1px solid var(--border-default);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
  color: var(--fg-default);
}

.version-card:hover {
  border-color: #8c959f;
  box-shadow: var(--shadow-medium);
  text-decoration: none;
}

.version-card h3 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.94rem;
}

.version-card p {
  margin: 0;
  color: var(--fg-muted);
}

.badge {
  width: max-content;
  padding: 1px 7px;
  border: 1px solid var(--border-default);
  border-radius: 2em;
  color: var(--fg-muted);
  font-size: 0.72rem;
  font-weight: 600;
}

.badge.implemented {
  border-color: rgba(26, 127, 55, 0.4);
  color: var(--success-fg);
}

.badge.planned {
  border-color: rgba(154, 103, 0, 0.4);
  color: var(--attention-fg);
}

.file-sidebar {
  padding: 0;
}

.file-sidebar-header {
  position: sticky;
  top: 0;
  z-index: 3;
  display: grid;
  gap: 12px;
  padding: 18px 16px 14px;
  border-bottom: 1px solid var(--border-default);
  background: var(--surface);
}

.file-summary {
  display: block;
  margin-top: 2px;
  color: var(--fg-muted);
  font-size: 0.76rem;
}

.file-filter,
.view-toggle {
  display: inline-flex;
}

.file-filter button,
.view-toggle button {
  border-radius: 0;
  box-shadow: none;
}

.file-filter button:first-child,
.view-toggle button:first-child {
  border-radius: 6px 0 0 6px;
}

.file-filter button:last-child,
.view-toggle button:last-child {
  margin-left: -1px;
  border-radius: 0 6px 6px 0;
}

.file-filter button[aria-pressed="true"],
.view-toggle button[aria-pressed="true"] {
  z-index: 1;
  border-color: var(--accent-fg);
  background: var(--accent-muted);
  color: var(--accent-fg);
}

#fileNav {
  padding: 8px;
}

.file-group {
  margin: 0 0 10px;
}

.file-group h3 {
  margin: 0;
  padding: 7px 8px 4px;
  color: var(--fg-muted);
  font-size: 0.72rem;
  font-weight: 600;
}

.file-item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) auto;
  align-items: center;
  gap: 5px;
  width: 100%;
  min-height: 32px;
  padding: 5px 7px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  box-shadow: none;
  font-weight: 400;
  text-align: left;
}

.file-item:hover:not(:disabled) {
  border: 0;
  background: var(--canvas-inset);
}

.file-item[aria-current="true"] {
  background: var(--accent-muted);
  color: #0550ae;
}

.file-status-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-align: center;
}

.file-added .file-status-code,
.file-stats .add {
  color: var(--success-fg);
}

.file-deleted .file-status-code,
.file-stats .delete {
  color: var(--danger-fg);
}

.file-modified .file-status-code {
  color: var(--attention-fg);
}

.file-unchanged {
  color: var(--fg-muted);
}

.file-name {
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-stats {
  display: flex;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
}

.file-empty {
  padding: 12px 8px;
  color: var(--fg-muted);
  font-size: 0.82rem;
}

.compare-main {
  min-width: 0;
  padding: 28px 30px 48px;
}

.compare-page {
  max-width: none;
}

.compare-page h1 {
  margin: 2px 0 6px;
  padding: 0;
  border: 0;
  font-size: 1.7rem;
}

.compare-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.compare-heading .lede {
  margin-bottom: 0;
}

.pair-navigation {
  display: flex;
  flex: none;
  gap: 6px;
}

.compare-toolbar {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) 24px minmax(230px, 1fr) auto;
  align-items: end;
  gap: 10px;
  margin: 20px 0 12px;
  padding: 14px;
  border: 1px solid var(--border-default);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
}

.compare-toolbar label {
  display: grid;
  gap: 5px;
  color: var(--fg-muted);
  font-size: 0.76rem;
  font-weight: 600;
}

.direction-arrow {
  align-self: center;
  color: var(--fg-muted);
  font-size: 1.2rem;
  text-align: center;
}

.evolution-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 68px;
  margin-bottom: 14px;
  padding: 12px 14px;
  border: 1px solid #b6e3ff;
  border-radius: 6px;
  background: #ddf4ff;
}

.evolution-summary strong {
  display: block;
  margin-top: 2px;
}

.summary-theme {
  display: block;
  margin-top: 2px;
  color: #0550ae;
  font-size: 0.8rem;
  font-weight: 600;
}

.evolution-summary p {
  margin: 2px 0 0;
  color: var(--fg-muted);
  font-size: 0.84rem;
}

.evolution-summary > a {
  flex: none;
  font-weight: 600;
}

.evolution-summary details {
  flex: 1;
}

.evolution-summary summary {
  cursor: pointer;
  font-weight: 600;
}

.evolution-summary ol {
  display: grid;
  gap: 6px;
  margin: 10px 0 2px;
  padding-left: 24px;
}

.evolution-summary li span {
  display: block;
  color: var(--fg-muted);
  font-size: 0.78rem;
}

.diff-panel {
  min-width: 0;
  border: 1px solid var(--border-default);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: var(--shadow-small);
}

.diff-panel-header {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  align-items: center;
  gap: 16px;
  min-height: 52px;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border-default);
  background: var(--canvas-subtle);
}

.current-file {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 8px;
}

.current-file h2 {
  overflow: hidden;
  margin: 0;
  padding: 0;
  border: 0;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-status {
  flex: none;
  padding: 1px 6px;
  border: 1px solid var(--border-default);
  border-radius: 2em;
  font-size: 0.68rem;
  font-weight: 600;
}

.file-status.file-added {
  border-color: rgba(26, 127, 55, 0.4);
  color: var(--success-fg);
}

.file-status.file-deleted {
  border-color: rgba(207, 34, 46, 0.4);
  color: var(--danger-fg);
}

.file-status.file-modified {
  border-color: rgba(154, 103, 0, 0.4);
  color: var(--attention-fg);
}

.diff-summary,
.change-navigation {
  display: flex;
  align-items: center;
  gap: 6px;
}

.diff-count {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 7px;
  border-radius: 2em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
}

.diff-count.add {
  background: var(--success-muted);
  color: var(--success-fg);
}

.diff-count.delete {
  background: var(--danger-muted);
  color: var(--danger-fg);
}

.change-navigation span {
  min-width: 86px;
  color: var(--fg-muted);
  font-size: 0.76rem;
  text-align: center;
}

.change-navigation button {
  min-height: 30px;
  padding: 3px 9px;
}

.diff-scroll {
  max-height: calc(100vh - 325px);
  min-height: 300px;
  overflow: auto;
  background: var(--surface);
}

.diff-scroll.split-scroll {
  overflow-x: hidden;
}

.diff-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  color: var(--fg-default);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1.5;
}

.diff-table.diff-split {
  min-width: 100%;
  table-layout: fixed;
}

.diff-table.diff-unified {
  min-width: 820px;
}

.diff-table thead th {
  position: sticky;
  top: 0;
  z-index: 4;
  height: 32px;
  padding: 5px 12px;
  border-bottom: 1px solid var(--border-default);
  background: var(--canvas-subtle);
  color: var(--fg-muted);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-align: left;
}

.diff-table thead th + th {
  border-left: 1px solid var(--border-default);
}

.diff-table td {
  height: 22px;
  padding: 0 8px;
  border-top: 1px solid transparent;
  vertical-align: top;
  white-space: pre;
}

.diff-code {
  overflow: hidden;
}

.diff-code code {
  padding: 0;
  background: transparent;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
}

.diff-split .diff-col-line {
  width: 48px;
}

.diff-split .diff-col-marker {
  width: 20px;
}

.diff-split .diff-col-code {
  width: calc(50% - 68px);
}

.diff-split td.diff-code {
  width: auto;
  min-width: 0;
  padding: 0;
}

.diff-unified .diff-code {
  width: 100%;
  min-width: 700px;
}

.diff-line-no {
  width: 48px;
  min-width: 48px;
  padding-right: 8px;
  border-right: 1px solid var(--border-muted);
  background: var(--canvas-subtle);
  color: #8c959f;
  text-align: right;
  user-select: none;
}

.diff-marker {
  width: 20px;
  min-width: 20px;
  padding: 0 4px;
  text-align: center;
  user-select: none;
}

.diff-code-clip {
  width: 100%;
  overflow: hidden;
  padding: 0 8px;
}

.diff-code-content {
  display: inline-block;
  min-width: max-content;
  transform: translateX(var(--diff-code-offset, 0));
  will-change: transform;
}

.diff-horizontal-scroll {
  position: sticky;
  bottom: 0;
  z-index: 5;
  height: 14px;
  overflow-x: auto;
  overflow-y: hidden;
  border-top: 1px solid var(--border-muted);
  background: var(--surface);
}

.diff-horizontal-scroll-space {
  height: 1px;
}

.diff-split .diff-line-no.target {
  border-left: 1px solid var(--border-default);
}

.diff-row.diff-delete .base,
.diff-row.diff-change .base {
  background: var(--danger-muted);
}

.diff-row.diff-add .target,
.diff-row.diff-change .target {
  background: var(--success-muted);
}

.diff-row.diff-delete .diff-marker.base,
.diff-row.diff-change .diff-marker.base {
  background: #ffcecb;
  color: var(--danger-fg);
}

.diff-row.diff-add .diff-marker.target,
.diff-row.diff-change .diff-marker.target {
  background: #aceebb;
  color: var(--success-fg);
}

.word-change {
  padding: 0;
  border-radius: 2px;
  color: inherit;
}

.word-change.base {
  background: #ff818266;
}

.word-change.target {
  background: #2da44e40;
}

.diff-fold td {
  padding: 4px 12px;
  border-top: 1px solid #b6e3ff;
  border-bottom: 1px solid #b6e3ff;
  background: var(--accent-muted);
  text-align: center;
}

.diff-fold button {
  min-height: 24px;
  padding: 1px 10px;
  border: 0;
  background: transparent;
  box-shadow: none;
  color: var(--accent-fg);
  font-size: 0.72rem;
}

.syntax-keyword {
  color: #cf222e;
}

.syntax-string {
  color: #0a3069;
}

.syntax-number {
  color: #0550ae;
}

.syntax-comment {
  color: #6e7781;
}

.empty-code {
  padding: 36px;
  color: var(--fg-muted);
  text-align: center;
}