/* Root variables */
:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --border-color: #e0e0e0;
  --header-bg: #f8f9fa;
  --sidebar-bg: #f5f5f5;
  --hover-bg: #e9ecef;
  --active-bg: #dee2e6;
  --code-bg: #f8f8f8;
  --code-text: #333333;
  --link-color: #0066cc;
  --success-color: #28a745;
  --error-color: #dc3545;
  --warning-color: #ffc107;
  --shadow: rgba(0, 0, 0, 0.1);
  --diff-added-bg: #e6ffec;
  --diff-added-gutter: #ccffd8;
  --diff-removed-bg: #ffebe9;
  --diff-removed-gutter: #ffd7d5;
  --diff-line-number: #8b949e;
  --diff-added-text: #1a7f37;
  --diff-removed-text: #cf222e;
}

[data-theme="dark"] {
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --border-color: #404040;
  --header-bg: #2d2d2d;
  --sidebar-bg: #242424;
  --hover-bg: #333333;
  --active-bg: #3d3d3d;
  --code-bg: #272822;
  --code-text: #f8f8f2;
  --link-color: #4da6ff;
  --shadow: rgba(0, 0, 0, 0.3);
  --diff-added-bg: #12261a;
  --diff-added-gutter: #17361f;
  --diff-removed-bg: #29181b;
  --diff-removed-gutter: #3d2023;
  --diff-line-number: #6e7681;
  --diff-added-text: #3fb950;
  --diff-removed-text: #f85149;
}

/* Global styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

/* Header */
.header-container {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  height: 60px;
  min-height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px var(--shadow);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Version dropdown */
.repo-select,
.version-select {
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--sidebar-bg);
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.2s ease;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
}

.repo-select option,
.version-select option {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-weight: normal;
  padding: 0.5rem;
}

[data-theme="dark"] .repo-select,
[data-theme="dark"] .version-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23aaa' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

.repo-select:hover,
.version-select:hover {
  border-color: var(--link-color);
  background-color: var(--hover-bg);
}

.repo-select:focus,
.version-select:focus {
  outline: none;
  border-color: var(--link-color);
  box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.15);
}

/* Navigation history box in header */
.navigation-box {
  display: flex;
  gap: 0.5rem;
}

.nav-button {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 6px;
  background: rgba(79, 172, 254, 0.15);
  color: var(--link-color);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.nav-button:hover:not(:disabled) {
  background: rgba(79, 172, 254, 0.25);
  transform: scale(1.05);
}

.nav-button:active:not(:disabled) {
  transform: scale(0.95);
}

.nav-button:disabled {
  background: rgba(100, 100, 100, 0.1);
  color: rgba(150, 150, 150, 0.5);
  cursor: not-allowed;
}

.nav-button i {
  pointer-events: none;
}

.header-container h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
  line-height: 1;
}

/* Theme toggle */
.toggle-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.3s;
  border-radius: 24px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s;
  border-radius: 50%;
}

input:checked + .toggle-slider {
  background-color: #2196F3;
}

input:checked + .toggle-slider:before {
  transform: translateX(26px);
}

/* Main layout */
.main-container {
  display: flex;
  height: calc(100vh - 60px);
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 450px;
  min-width: 200px;
  max-width: 800px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  height: 100%;
}

/* Resize handle */
.resize-handle {
  width: 4px;
  background-color: var(--border-color);
  cursor: col-resize;
  transition: background-color 0.2s;
  flex-shrink: 0;
}

.resize-handle:hover {
  background-color: var(--link-color);
}

.search-container {
  position: relative;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--sidebar-bg);
  height: 52px;
  min-height: 52px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.search-container input {
  width: 100%;
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: 0.9rem;
}

.search-container input:focus {
  outline: none;
  border-color: var(--link-color);
}

#searchClear {
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-color);
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Fork filters */
.fork-filters {
  padding: 0.4rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  background-color: var(--sidebar-bg);
  height: 44px;
  min-height: 44px;
  box-sizing: border-box;
  scrollbar-width: none;
  flex-shrink: 0;
}

.fork-filters::-webkit-scrollbar {
  display: none;
}

/* Type filters */
.type-filters {
  padding: 0.4rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  background-color: var(--sidebar-bg);
  height: 44px;
  min-height: 44px;
  box-sizing: border-box;
  scrollbar-width: none;
  flex-shrink: 0;
}

.type-filters::-webkit-scrollbar {
  display: none;
}

.fork-filter-btn,
.type-filter-btn {
  padding: 0.3rem 0.75rem;
  border: 1.5px solid var(--border-color);
  border-radius: 16px;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.fork-filter-btn:hover,
.type-filter-btn:hover {
  border-color: var(--link-color);
  background-color: var(--hover-bg);
}

.fork-filter-btn.active,
.type-filter-btn.active {
  background-color: var(--link-color);
  color: white;
  border-color: var(--link-color);
  font-weight: 500;
}

.fork-filter-btn.disabled,
.type-filter-btn.disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

/* Tree navigation */
.tree-container {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
  min-height: 0;
}

.tree-node {
  user-select: none;
}

.tree-label {
  padding: 0.4rem 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 4px;
  transition: background-color 0.2s;
  white-space: nowrap;
}

.tree-label:hover {
  background-color: var(--hover-bg);
}

.tree-label.active {
  background-color: var(--active-bg);
  font-weight: 600;
}

.tree-icon {
  width: 16px;
  min-width: 16px;
  text-align: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.tree-label > span:not(.tree-icon):not(.tree-count) {
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-children {
  margin-left: 1rem;
  border-left: 1px solid var(--border-color);
  padding-left: 0.5rem;
  margin-top: 0.25rem;
}

.tree-children.collapsed {
  display: none;
}

/* Inline code style for item names in tree */
.tree-item-name {
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.85rem;
  background-color: var(--hover-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Fork badges in tree items */
.tree-fork-badges {
  display: flex;
  gap: 3px;
  margin-left: auto;
  flex-shrink: 0;
}

.tree-fork-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  /* Single-letter labels stay square; longer ones grow to fit */
  min-width: 18px;
  padding: 0 3px;
  height: 18px;
  border-radius: 3px;
  font-size: 0.65rem;
  font-weight: 600;
  color: white;
}

.tree-fork-badge-more {
  background-color: var(--hover-bg) !important;
  color: var(--text-color);
  opacity: 0.7;
}

/* Content area */
.content {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

.welcome-screen {
  text-align: center;
  padding: 3rem 2rem;
}

.welcome-screen h2 {
  margin-bottom: 1rem;
  color: var(--text-color);
}

.welcome-screen p {
  color: #666;
  margin-bottom: 2rem;
}

.stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.stat-box {
  padding: 1rem 2rem;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  min-width: 150px;
}

.stat-box h3 {
  font-size: 2rem;
  color: var(--link-color);
  margin-bottom: 0.5rem;
}

.stat-box p {
  color: #666;
  font-size: 0.9rem;
}

/* Spec viewer */
.spec-viewer {
  max-width: 1200px;
}

.spec-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  gap: 1rem;
}

.spec-header h2 {
  font-size: 1.5rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.spec-header h2 code {
  font-family: "Monaco", "Courier New", monospace;
  font-size: 1.4rem;
  background-color: var(--hover-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

/* Network difference warning indicator */
.network-diff-warning {
  color: var(--warning-color);
  margin-left: 0.25rem;
  font-size: 0.75rem;
  cursor: help;
  flex-shrink: 0;
}

/* Muted copy link icon button */
.copy-link-icon {
  background: none;
  border: none;
  color: var(--text-color);
  opacity: 0.4;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  font-size: 0.85rem;
  transition: opacity 0.2s;
  margin-left: auto;
}

.copy-link-icon:hover {
  opacity: 0.8;
}

/* Variable header for copy button */
.variable-header {
  display: flex;
  justify-content: flex-end;
  padding: 0.5rem 1rem 0 1rem;
}

.breadcrumb {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb span {
  color: var(--text-color);
}

.spec-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* File box styles (matching test viewer) */
.file-box {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--sidebar-bg);
  overflow: hidden;
}

.file-header {
  padding: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--sidebar-bg);
  transition: background-color 0.2s;
  user-select: none;
}

.file-header:hover {
  background-color: var(--hover-bg);
}

.file-toggle-icon {
  color: var(--link-color);
  font-size: 0.9rem;
  width: 16px;
  flex-shrink: 0;
}

.file-name {
  font-family: "Monaco", "Courier New", monospace;
  font-weight: 600;
  color: var(--text-color);
  flex: 1;
}

.file-name-badge {
  display: inline-block;
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  font-weight: 600;
  color: white;
  font-size: 0.85rem;
}

.file-content {
  max-height: 100000px;
  overflow: hidden;
  transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
  opacity: 1;
  border-top: 1px solid var(--border-color);
}

.file-content.collapsed {
  max-height: 0;
  opacity: 0;
  border-top: none;
}

/* Fork badge for variables table */
.fork-badge {
  display: inline-block;
  color: #fff;
  border-radius: 4px;
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.test-code-box {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 1.5rem;
  margin: 0;
  overflow-x: auto;
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  border-radius: 0;
  scrollbar-width: none;
}

.test-code-box::-webkit-scrollbar {
  display: none;
}

/* Override Prism theme styles */
pre.test-code-box[class*="language-"],
pre.test-code-box {
  background-color: var(--code-bg);
  color: var(--code-text);
  margin: 0;
  border-radius: 0;
}

.test-code-box code,
.test-code-box code[class*="language-"] {
  background: none;
  color: inherit;
  padding: 0;
}

/* Variable table styles */
.variable-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
}

.variable-table th,
.variable-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.variable-table th {
  background-color: var(--hover-bg);
  font-weight: 600;
}

.variable-table tr:last-child td {
  border-bottom: none;
}

.variable-table code {
  background-color: var(--hover-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.85rem;
}

/* Loading and error states */
.loading {
  text-align: center;
  padding: 3rem;
  font-size: 1.2rem;
  color: #666;
}

.loading i {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.error-message {
  padding: 1rem;
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
  border-radius: 4px;
  margin: 1rem;
}

[data-theme="dark"] .error-message {
  background-color: #541f22;
  color: #f8d7da;
  border-color: #721c24;
}

/* Utility classes */
.hidden {
  display: none !important;
}

/* Tree filtering - hide filtered-out nodes */
.tree-node.tree-filtered {
  display: none;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--sidebar-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #999;
}

/* Clickable spec references */
.spec-reference {
  cursor: pointer !important;
  text-decoration: underline !important;
  text-decoration-color: #4fc3f7 !important;
  text-decoration-style: dotted !important;
  text-underline-offset: 2px !important;
  text-decoration-thickness: 1.5px !important;
  transition: all 0.2s ease !important;
}

.spec-reference:hover {
  text-decoration-color: #81d4fa !important;
  text-decoration-style: solid !important;
  text-decoration-thickness: 2px !important;
}

[data-theme="dark"] .spec-reference {
  text-decoration-color: #64b5f6 !important;
}

[data-theme="dark"] .spec-reference:hover {
  text-decoration-color: #90caf9 !important;
}

/* Used by section */
.used-by-section {
  margin-top: 1.5rem;
  padding: 1rem;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.used-by-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.used-by-title {
  font-weight: 600;
  color: var(--text-color);
}

.used-by-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.used-by-item {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.used-by-item:hover {
  border-color: var(--link-color);
  background-color: var(--hover-bg);
}

.used-by-item code {
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.8rem;
  color: var(--text-color);
  background: none;
  padding: 0;
}

/* Prism syntax highlighting - Light theme */
code[class*="language-"],
pre[class*="language-"] {
  color: #333;
  background: none;
  font-family: "Monaco", "Courier New", monospace;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.5;
  tab-size: 4;
  hyphens: none;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #708090;
}

.token.punctuation {
  color: #333;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #905;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #690;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: #9a6e3a;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #07a;
}

.token.function,
.token.class-name {
  color: #dd4a68;
}

.token.regex,
.token.important,
.token.variable {
  color: #e90;
}

/* Prism syntax highlighting - Dark theme */
[data-theme="dark"] code[class*="language-"],
[data-theme="dark"] pre[class*="language-"] {
  color: #f8f8f2;
}

[data-theme="dark"] .token.comment,
[data-theme="dark"] .token.prolog,
[data-theme="dark"] .token.doctype,
[data-theme="dark"] .token.cdata {
  color: #8292a2;
}

[data-theme="dark"] .token.punctuation {
  color: #f8f8f2;
}

[data-theme="dark"] .token.property,
[data-theme="dark"] .token.tag,
[data-theme="dark"] .token.constant,
[data-theme="dark"] .token.symbol,
[data-theme="dark"] .token.deleted {
  color: #f92672;
}

[data-theme="dark"] .token.boolean,
[data-theme="dark"] .token.number {
  color: #ae81ff;
}

[data-theme="dark"] .token.selector,
[data-theme="dark"] .token.attr-name,
[data-theme="dark"] .token.string,
[data-theme="dark"] .token.char,
[data-theme="dark"] .token.builtin,
[data-theme="dark"] .token.inserted {
  color: #a6e22e;
}

[data-theme="dark"] .token.operator,
[data-theme="dark"] .token.entity,
[data-theme="dark"] .token.url,
[data-theme="dark"] .language-css .token.string,
[data-theme="dark"] .style .token.string {
  color: #f8f8f2;
}

[data-theme="dark"] .token.atrule,
[data-theme="dark"] .token.attr-value,
[data-theme="dark"] .token.keyword {
  color: #66d9ef;
}

[data-theme="dark"] .token.function,
[data-theme="dark"] .token.class-name {
  color: #e6db74;
}

[data-theme="dark"] .token.regex,
[data-theme="dark"] .token.important,
[data-theme="dark"] .token.variable {
  color: #fd971f;
}

/* Not found message */
.not-found-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-color);
  opacity: 0.8;
}

.not-found-message i {
  font-size: 3rem;
  color: var(--warning-color);
  margin-bottom: 1rem;
}

.not-found-message p {
  margin: 0.5rem 0;
  font-size: 1rem;
}

.not-found-message p:first-of-type {
  font-size: 1.1rem;
}

/* Mobile menu toggle button */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 8px;
  background: rgba(79, 172, 254, 0.15);
  color: var(--link-color);
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.menu-toggle:hover {
  background: rgba(79, 172, 254, 0.25);
}

.menu-toggle:active {
  transform: scale(0.95);
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 40;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.visible {
  display: block;
  opacity: 1;
}

/* Responsive design */
@media (max-width: 768px) {
  /* Show hamburger menu */
  .menu-toggle {
    display: flex;
  }

  /* Hide title on mobile */
  .header-container h1 {
    display: none;
  }

  /* Adjust header padding */
  .header-container {
    padding: 0 1rem;
  }

  /* Reduce header-left gap */
  .header-left {
    gap: 0.75rem;
    min-width: 0;
  }

  /* Both selectors share the row once the title is hidden */
  .repo-select,
  .version-select {
    min-width: 0;
    max-width: 42vw;
    text-overflow: ellipsis;
  }

  /* Reduce header-right gap */
  .header-right {
    gap: 0.75rem;
  }

  /* Sidebar styles for mobile */
  .sidebar {
    width: 85%;
    max-width: 320px;
    position: fixed;
    top: 60px;
    left: 0;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 50;
    height: calc(100vh - 60px);
    box-shadow: 2px 0 8px var(--shadow);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  /* Hide resize handle on mobile */
  .resize-handle {
    display: none;
  }

  /* Content takes full width */
  .content {
    width: 100%;
    padding: 1rem;
  }

  /* Adjust welcome screen padding */
  .welcome-screen {
    padding: 2rem 1rem;
  }

  /* Stack stat boxes on narrow screens */
  .stats {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
  }

  .stat-box {
    width: 100%;
    max-width: 250px;
  }

  /* Ensure code blocks scroll horizontally */
  .test-code-box {
    padding: 1rem;
    font-size: 0.8rem;
  }

  /* Ensure tables scroll horizontally */
  .variable-table {
    display: block;
    overflow-x: auto;
  }

  .variable-table th,
  .variable-table td {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
  }

  /* Adjust spec header for mobile */
  .spec-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .spec-header h2 {
    font-size: 1.2rem;
    white-space: normal;
  }

  .spec-header h2 code {
    font-size: 1.1rem;
  }

  /* Adjust breadcrumb for mobile */
  .breadcrumb {
    font-size: 0.8rem;
    word-break: break-word;
  }

  /* Adjust file header for mobile */
  .file-header {
    padding: 0.75rem;
  }

  .file-name {
    font-size: 0.85rem;
    word-break: break-all;
  }

  /* Adjust used-by items for mobile */
  .used-by-list {
    gap: 0.4rem;
  }

  .used-by-item {
    padding: 0.2rem 0.4rem;
  }

  .used-by-item code {
    font-size: 0.75rem;
  }
}


/* ==========================================================================
   Fork-to-fork diff
   ========================================================================== */

/* Header controls */
.diff-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.diff-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

.diff-toggle-btn:hover:not(:disabled) {
  background-color: var(--hover-bg);
}

.diff-toggle-btn.active {
  background-color: var(--link-color);
  border-color: var(--link-color);
  color: #fff;
}

.diff-toggle-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Per-fork header annotations */
.diff-stats {
  display: inline-flex;
  gap: 0.45rem;
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.8rem;
  font-weight: 600;
}

.diff-stat-added {
  color: var(--diff-added-text);
}

.diff-stat-removed {
  color: var(--diff-removed-text);
}

.diff-no-change-badge {
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-color);
  opacity: 0.6;
  font-size: 0.75rem;
  white-space: nowrap;
}

/* Diff body */
.diff-container {
  background-color: var(--code-bg);
  overflow-x: auto;
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  scrollbar-width: thin;
}

.diff-unified {
  width: 100%;
  border-collapse: collapse;
  color: var(--code-text);
}

.diff-unified td {
  padding: 0 0.5rem;
  vertical-align: top;
  border: none;
}

.diff-line-number {
  width: 1%;
  min-width: 2.75rem;
  padding: 0 0.6rem;
  text-align: right;
  color: var(--diff-line-number);
  font-size: 0.8rem;
  user-select: none;
  white-space: nowrap;
}

.diff-line-prefix {
  width: 1%;
  padding: 0 0.4rem;
  text-align: center;
  color: var(--diff-line-number);
  user-select: none;
}

.diff-line-content {
  width: auto;
  white-space: pre;
  padding-right: 1rem;
}

/* Diff rows */
.diff-line-added {
  background-color: var(--diff-added-bg);
}

.diff-line-added .diff-line-number,
.diff-line-added .diff-line-prefix {
  background-color: var(--diff-added-gutter);
  color: var(--diff-added-text);
}

.diff-line-removed {
  background-color: var(--diff-removed-bg);
}

.diff-line-removed .diff-line-number,
.diff-line-removed .diff-line-prefix {
  background-color: var(--diff-removed-gutter);
  color: var(--diff-removed-text);
}

@media (max-width: 768px) {
  .diff-controls {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}