.CodeMirror{font-family:monospace;height:300px;color:#000;direction:ltr}.CodeMirror-lines{padding:4px 0}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{padding:0 4px}.CodeMirror-gutter-filler,.CodeMirror-scrollbar-filler{background-color:#fff}.CodeMirror-gutters{border-right:1px solid #ddd;background-color:#f7f7f7;white-space:nowrap}.CodeMirror-linenumber{padding:0 3px 0 5px;min-width:20px;text-align:right;color:#999;white-space:nowrap}.CodeMirror-guttermarker{color:#000}.CodeMirror-guttermarker-subtle{color:#999}.CodeMirror-cursor{border-left:1px solid #000;border-right:none;width:0}.CodeMirror div.CodeMirror-secondarycursor{border-left:1px solid silver}.cm-fat-cursor .CodeMirror-cursor{width:auto;border:0!important;background:#7e7}.cm-fat-cursor div.CodeMirror-cursors{z-index:1}.cm-fat-cursor .CodeMirror-line::selection,.cm-fat-cursor .CodeMirror-line>span::selection,.cm-fat-cursor .CodeMirror-line>span>span::selection{background:0 0}.cm-fat-cursor .CodeMirror-line::-moz-selection,.cm-fat-cursor .CodeMirror-line>span::-moz-selection,.cm-fat-cursor .CodeMirror-line>span>span::-moz-selection{background:0 0}.cm-fat-cursor{caret-color:transparent}@-moz-keyframes blink{50%{background-color:transparent}}@-webkit-keyframes blink{50%{background-color:transparent}}@keyframes blink{50%{background-color:transparent}}.cm-tab{display:inline-block;text-decoration:inherit}.CodeMirror-rulers{position:absolute;left:0;right:0;top:-50px;bottom:0;overflow:hidden}.CodeMirror-ruler{border-left:1px solid #ccc;top:0;bottom:0;position:absolute}.cm-s-default .cm-header{color:#00f}.cm-s-default .cm-quote{color:#090}.cm-negative{color:#d44}.cm-positive{color:#292}.cm-header,.cm-strong{font-weight:700}.cm-em{font-style:italic}.cm-link{text-decoration:underline}.cm-strikethrough{text-decoration:line-through}.cm-s-default .cm-keyword{color:#708}.cm-s-default .cm-atom{color:#219}.cm-s-default .cm-number{color:#164}.cm-s-default .cm-def{color:#00f}.cm-s-default .cm-variable-2{color:#05a}.cm-s-default .cm-type,.cm-s-default .cm-variable-3{color:#085}.cm-s-default .cm-comment{color:#a50}.cm-s-default .cm-string{color:#a11}.cm-s-default .cm-string-2{color:#f50}.cm-s-default .cm-meta{color:#555}.cm-s-default .cm-qualifier{color:#555}.cm-s-default .cm-builtin{color:#30a}.cm-s-default .cm-bracket{color:#997}.cm-s-default .cm-tag{color:#170}.cm-s-default .cm-attribute{color:#00c}.cm-s-default .cm-hr{color:#999}.cm-s-default .cm-link{color:#00c}.cm-s-default .cm-error{color:red}.cm-invalidchar{color:red}.CodeMirror-composing{border-bottom:2px solid}div.CodeMirror span.CodeMirror-matchingbracket{color:#0b0}div.CodeMirror span.CodeMirror-nonmatchingbracket{color:#a22}.CodeMirror-matchingtag{background:rgba(255,150,0,.3)}.CodeMirror-activeline-background{background:#e8f2ff}.CodeMirror{position:relative;overflow:hidden;background:#fff}.CodeMirror-scroll{overflow:scroll!important;margin-bottom:-50px;margin-right:-50px;padding-bottom:50px;height:100%;outline:0;position:relative;z-index:0}.CodeMirror-sizer{position:relative;border-right:50px solid transparent}.CodeMirror-gutter-filler,.CodeMirror-hscrollbar,.CodeMirror-scrollbar-filler,.CodeMirror-vscrollbar{position:absolute;z-index:6;display:none;outline:0}.CodeMirror-vscrollbar{right:0;top:0;overflow-x:hidden;overflow-y:scroll}.CodeMirror-hscrollbar{bottom:0;left:0;overflow-y:hidden;overflow-x:scroll}.CodeMirror-scrollbar-filler{right:0;bottom:0}.CodeMirror-gutter-filler{left:0;bottom:0}.CodeMirror-gutters{position:absolute;left:0;top:0;min-height:100%;z-index:3}.CodeMirror-gutter{white-space:normal;height:100%;display:inline-block;vertical-align:top;margin-bottom:-50px}.CodeMirror-gutter-wrapper{position:absolute;z-index:4;background:0 0!important;border:none!important}.CodeMirror-gutter-background{position:absolute;top:0;bottom:0;z-index:4}.CodeMirror-gutter-elt{position:absolute;cursor:default;z-index:4}.CodeMirror-gutter-wrapper ::selection{background-color:transparent}.CodeMirror-gutter-wrapper ::-moz-selection{background-color:transparent}.CodeMirror-lines{cursor:text;min-height:1px}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{-moz-border-radius:0;-webkit-border-radius:0;border-radius:0;border-width:0;background:0 0;font-family:inherit;font-size:inherit;margin:0;white-space:pre;word-wrap:normal;line-height:inherit;color:inherit;z-index:2;position:relative;overflow:visible;-webkit-tap-highlight-color:transparent;-webkit-font-variant-ligatures:contextual;font-variant-ligatures:contextual}.CodeMirror-wrap pre.CodeMirror-line,.CodeMirror-wrap pre.CodeMirror-line-like{word-wrap:break-word;white-space:pre-wrap;word-break:normal}.CodeMirror-linebackground{position:absolute;left:0;right:0;top:0;bottom:0;z-index:0}.CodeMirror-linewidget{position:relative;z-index:2;padding:.1px}.CodeMirror-rtl pre{direction:rtl}.CodeMirror-code{outline:0}.CodeMirror-gutter,.CodeMirror-gutters,.CodeMirror-linenumber,.CodeMirror-scroll,.CodeMirror-sizer{-moz-box-sizing:content-box;box-sizing:content-box}.CodeMirror-measure{position:absolute;width:100%;height:0;overflow:hidden;visibility:hidden}.CodeMirror-cursor{position:absolute;pointer-events:none}.CodeMirror-measure pre{position:static}div.CodeMirror-cursors{visibility:hidden;position:relative;z-index:3}div.CodeMirror-dragcursors{visibility:visible}.CodeMirror-focused div.CodeMirror-cursors{visibility:visible}.CodeMirror-selected{background:#d9d9d9}.CodeMirror-focused .CodeMirror-selected{background:#d7d4f0}.CodeMirror-crosshair{cursor:crosshair}.CodeMirror-line::selection,.CodeMirror-line>span::selection,.CodeMirror-line>span>span::selection{background:#d7d4f0}.CodeMirror-line::-moz-selection,.CodeMirror-line>span::-moz-selection,.CodeMirror-line>span>span::-moz-selection{background:#d7d4f0}.cm-searching{background-color:#ffa;background-color:rgba(255,255,0,.4)}.cm-force-border{padding-right:.1px}@media print{.CodeMirror div.CodeMirror-cursors{visibility:hidden}}.cm-tab-wrap-hack:after{content:''}span.CodeMirror-selectedtext{background:0 0}
.CodeMirror-foldmarker {
  color: blue;
  text-shadow: #b9f 1px 1px 2px, #b9f -1px -1px 2px, #b9f 1px -1px 2px, #b9f -1px 1px 2px;
  font-family: arial;
  line-height: .3;
  cursor: pointer;
}
.CodeMirror-foldgutter {
  width: .7em;
}
.CodeMirror-foldgutter-open,
.CodeMirror-foldgutter-folded {
  cursor: pointer;
}
.CodeMirror-foldgutter-open:after {
  content: "\25BE";
}
.CodeMirror-foldgutter-folded:after {
  content: "\25B8";
}

.CodeMirror-dialog {
  position: absolute;
  left: 0; right: 0;
  background: inherit;
  z-index: 15;
  padding: .1em .8em;
  overflow: hidden;
  color: inherit;
}

.CodeMirror-dialog-top {
  border-bottom: 1px solid #eee;
  top: 0;
}

.CodeMirror-dialog-bottom {
  border-top: 1px solid #eee;
  bottom: 0;
}

.CodeMirror-dialog input {
  border: none;
  outline: none;
  background: transparent;
  width: 20em;
  color: inherit;
  font-family: monospace;
}

.CodeMirror-dialog button {
  font-size: 70%;
}

/* ============================================================
   fbrell Design System — Dark-first, modern developer tool UI
   ============================================================ */

/* ----------------------------------------------------------
   1. Reset & Base
   ---------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  height: 100%;
}

body {
  height: 100%;
  overflow: hidden;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
}

input, select, textarea {
  font: inherit;
  color: inherit;
}

/* ----------------------------------------------------------
   2. Design Tokens
   ---------------------------------------------------------- */
:root {
  /* Colors — dark theme (default) */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-editor: #1e1e2e;
  --bg-surface: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-emphasis: #1f6feb;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;

  /* Typography */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', monospace;

  /* Spacing (4px base grid) */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-7: 32px;
  --sp-8: 40px;
  --sp-9: 48px;

  /* Type scale (1.2) */
  --text-xs: 11px;
  --text-sm: 13px;
  --text-base: 16px;
  --text-lg: 19px;
  --text-xl: 23px;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Layout */
  --header-height: 48px;
  --sidebar-width: 240px;
  --log-width: 350px;
  --status-bar-height: 28px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-index layers */
  --z-header: 100;
  --z-sidebar: 90;
  --z-overlay: 200;
  --z-drawer: 210;
  --z-status: 50;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-editor: #ffffff;
  --bg-surface: #f0f2f5;
  --border: #d0d7de;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --text-muted: #8b949e;
  --accent: #0969da;
  --accent-emphasis: #0550ae;
  --success: #1a7f37;
  --warning: #9a6700;
  --danger: #d1242f;
}

/* ----------------------------------------------------------
   3. Typography
   ---------------------------------------------------------- */
body {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--text-primary);
  background: var(--bg-primary);
}

h1 { font-size: var(--text-xl); font-weight: 600; }
h2 { font-size: var(--text-lg); font-weight: 600; }
h3 { font-size: var(--text-base); font-weight: 600; }
h4 { font-size: var(--text-sm); font-weight: 600; }

code, pre, .mono {
  font-family: var(--font-mono);
}

/* ----------------------------------------------------------
   4. Layout — App Shell
   ---------------------------------------------------------- */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ----------------------------------------------------------
   5. Header
   ---------------------------------------------------------- */
.header {
  height: var(--header-height);
  min-height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-4);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  gap: var(--sp-4);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.logo {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.logo:hover {
  color: var(--accent);
}

.logo-accent {
  color: var(--accent);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding: var(--sp-1) var(--sp-2);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

button.sidebar-toggle {
  display: none;
}

/* ----------------------------------------------------------
   6. Auth Controls
   ---------------------------------------------------------- */
.auth-controls {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--text-xs);
}

.auth-label {
  color: var(--text-muted);
}

.auth-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--sp-2);
  border-radius: 9999px;
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: capitalize;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.auth-badge.auth-connected {
  background: rgba(63, 185, 80, 0.15);
  color: var(--success);
  border-color: rgba(63, 185, 80, 0.3);
}

.auth-badge.auth-not_authorized {
  background: rgba(210, 153, 34, 0.15);
  color: var(--warning);
  border-color: rgba(210, 153, 34, 0.3);
}

.auth-badge.auth-unknown {
  background: var(--bg-surface);
  color: var(--text-muted);
  border-color: var(--border);
}

/* ----------------------------------------------------------
   7. Main Layout — CSS Grid
   ---------------------------------------------------------- */
.main-layout {
  flex: 1;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr 6px var(--log-width);
  grid-template-rows: 1fr;
  overflow: hidden;
  min-height: 0;
}

/* ----------------------------------------------------------
   8. Sidebar
   ---------------------------------------------------------- */
.sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: var(--sp-3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-search {
  width: 100%;
  padding: var(--sp-1) var(--sp-2);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--text-xs);
  outline: none;
  transition: border-color var(--transition-fast);
}

.sidebar-search::placeholder {
  color: var(--text-muted);
}

.sidebar-search:focus {
  border-color: var(--accent);
}

.sidebar-tree {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-2) 0;
}

.sidebar-category {
  margin-bottom: var(--sp-1);
}

.sidebar-category-header {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  padding: var(--sp-1) var(--sp-3);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  user-select: none;
  transition: color var(--transition-fast);
}

.sidebar-category-header:hover {
  color: var(--text-primary);
}

.sidebar-toggle {
  font-size: 10px;
  transition: transform var(--transition-fast);
  display: inline-block;
  width: 12px;
  text-align: center;
}

.sidebar-category-name {
  flex: 1;
}

.sidebar-category-items {
  max-height: 500px;
  overflow: hidden;
  transition: max-height var(--transition-slow) ease;
}

.sidebar-category.collapsed .sidebar-category-items {
  max-height: 0;
}

.sidebar-category.collapsed .sidebar-toggle {
  transform: rotate(0deg);
}

.sidebar-item {
  display: block;
  padding: var(--sp-1) var(--sp-3);
  padding-left: var(--sp-7);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.sidebar-item:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

.sidebar-item.active {
  color: var(--accent);
  background: rgba(88, 166, 255, 0.08);
  border-left-color: var(--accent);
}

/* ----------------------------------------------------------
   9. Editor Column
   ---------------------------------------------------------- */
.editor-column {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-2) var(--sp-3);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: var(--sp-3);
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  min-width: 0;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
}

.example-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.editor-pane {
  flex: 1;
  overflow: hidden;
  background: var(--bg-editor);
  min-height: 100px;
}

#jscode {
  width: 100%;
  height: 100%;
  background: var(--bg-editor);
  color: var(--text-primary);
  border: none;
  padding: var(--sp-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  resize: none;
  outline: none;
}

/* ----------------------------------------------------------
   10. Resize Handles
   ---------------------------------------------------------- */
.resize-handle {
  background: var(--border);
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

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

.resize-handle-v {
  height: 6px;
  cursor: row-resize;
  width: 100%;
}

.resize-handle-h {
  width: 6px;
  cursor: col-resize;
  height: 100%;
}

/* ----------------------------------------------------------
   11. Output Pane
   ---------------------------------------------------------- */
.output-pane {
  flex: 0 0 auto;
  min-height: 120px;
  overflow-y: auto;
  padding: var(--sp-4);
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
}

#jsroot h1:first-child,
#jsroot h2:first-child,
#jsroot h3:first-child,
#jsroot h4:first-child {
  margin-top: auto;
}

#jsroot h1, #jsroot h2, #jsroot h3, #jsroot h4 {
  margin-top: 1em;
}

.empty-state {
  color: var(--text-muted);
  font-style: italic;
  font-size: var(--text-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 80px;
}

/* ----------------------------------------------------------
   12. Log Column
   ---------------------------------------------------------- */
.log-column {
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow: hidden;
}

.log-header {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.log-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.log-count {
  display: none;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--danger);
  background: rgba(248, 81, 73, 0.15);
  padding: 1px var(--sp-2);
  border-radius: 9999px;
}

.log-count.visible {
  display: inline-flex;
}

.log-filters {
  display: flex;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-left: auto;
}

.log-filter {
  padding: 2px var(--sp-2);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  background: var(--bg-surface);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.log-filter:hover {
  color: var(--text-primary);
}

.log-filter.active {
  color: var(--accent);
  background: var(--bg-primary);
  font-weight: 500;
}

.log-actions {
  display: flex;
  gap: var(--sp-1);
}

.log-entries {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-2);
}

.log-entry {
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  margin-bottom: var(--sp-1);
  border: 1px solid var(--border);
  animation: logFadeIn 200ms ease;
}

.log-entry.log-error {
  border-left: 3px solid var(--danger);
}

.log-entry.log-info {
  border-left: 3px solid var(--accent);
}

.log-entry.log-debug {
  border-left: 3px solid var(--success);
}

.log-entry-header {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  cursor: pointer;
  user-select: none;
}

.log-level-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px var(--sp-2);
  border-radius: 9999px;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  flex-shrink: 0;
}

.log-badge-error {
  background: rgba(248, 81, 73, 0.15);
  color: var(--danger);
}

.log-badge-info {
  background: rgba(88, 166, 255, 0.15);
  color: var(--accent);
}

.log-badge-debug {
  background: rgba(63, 185, 80, 0.15);
  color: var(--success);
}

.log-entry-title {
  flex: 1;
  font-size: var(--text-xs);
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.log-entry-time {
  font-size: var(--text-xs);
  color: var(--text-muted);
  flex-shrink: 0;
}

.log-entry-copy {
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.log-entry-header:hover .log-entry-copy {
  opacity: 1;
}

.log-toggle {
  font-size: 10px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.log-entry-body {
  display: none;
  padding: 0 var(--sp-3) var(--sp-3);
  border-top: 1px solid var(--border);
}

.log-entry-body.open {
  display: block;
}

.log-json {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  padding: var(--sp-2) var(--sp-3);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: var(--sp-2);
  border: 1px solid var(--border);
}

/* ----------------------------------------------------------
   13. Error Explanations
   ---------------------------------------------------------- */
.error-explanation {
  background: rgba(248, 81, 73, 0.06);
  border: 1px solid rgba(248, 81, 73, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--sp-3);
  margin-top: var(--sp-2);
}

.error-explanation-message {
  font-size: var(--text-sm);
  color: var(--danger);
  font-weight: 500;
  margin-bottom: var(--sp-2);
}

.error-explanation-suggestion {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin-bottom: var(--sp-2);
  line-height: 1.6;
}

.error-explanation-link {
  font-size: var(--text-xs);
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.error-explanation-link:hover {
  color: var(--accent-emphasis);
}

/* ----------------------------------------------------------
   14. Settings Drawer
   ---------------------------------------------------------- */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: var(--z-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.settings-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.settings-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  z-index: var(--z-drawer);
  transform: translateX(100%);
  transition: transform var(--transition-normal) ease-out;
  display: flex;
  flex-direction: column;
}

.settings-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: var(--text-base);
  flex-shrink: 0;
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4);
}

.setting-group {
  margin-bottom: var(--sp-4);
}

.setting-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--sp-1);
}

.drawer-footer {
  padding: var(--sp-3) var(--sp-4);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.rell-url-preview {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--sp-2) var(--sp-3);
  margin-bottom: var(--sp-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  word-break: break-all;
  color: var(--text-muted);
}

/* ----------------------------------------------------------
   15. Status Bar
   ---------------------------------------------------------- */
.status-bar {
  height: var(--status-bar-height);
  min-height: var(--status-bar-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 var(--sp-4);
  gap: var(--sp-4);
  font-size: var(--text-xs);
  color: var(--text-muted);
  z-index: var(--z-status);
}

.status-item {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  white-space: nowrap;
}

.status-link {
  margin-left: auto;
  color: var(--text-muted);
  text-decoration: none;
}

.status-link:hover {
  color: var(--accent);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  background: var(--text-muted);
}

.status-dot-success {
  background: var(--success);
}

.status-dot-warning {
  background: var(--warning);
}

.status-dot-danger {
  background: var(--danger);
}

/* ----------------------------------------------------------
   16. Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  padding: var(--sp-1) var(--sp-3);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-primary);
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:hover {
  background: var(--bg-secondary);
  border-color: var(--text-muted);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent-emphasis);
  color: #ffffff;
  border-color: var(--accent-emphasis);
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.btn-login {
  background: #1877F2;
  color: #ffffff;
  border-color: #1877F2;
  font-weight: 600;
}

.btn-login:hover {
  background: #166fe5;
  border-color: #166fe5;
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  padding: var(--sp-1) var(--sp-2);
  font-size: var(--text-xs);
}

.btn-link:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
  transform: none;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.btn-icon:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

/* Run button states */
#rell-run-code.running {
  animation: runPulse 1.5s ease-in-out infinite;
  opacity: 0.8;
}

#rell-run-code.success {
  animation: runSuccess 600ms ease;
}

#rell-run-code.error {
  animation: runError 600ms ease;
}

@keyframes runPulse {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

@keyframes runSuccess {
  0% { background: var(--accent-emphasis); }
  30% { background: var(--success); border-color: var(--success); }
  100% { background: var(--accent-emphasis); border-color: var(--accent-emphasis); }
}

@keyframes runError {
  0% { background: var(--accent-emphasis); }
  30% { background: var(--danger); border-color: var(--danger); }
  100% { background: var(--accent-emphasis); border-color: var(--accent-emphasis); }
}

/* ----------------------------------------------------------
   17. Form Controls
   ---------------------------------------------------------- */
input.rell-setting,
select.rell-setting {
  width: 100%;
  padding: var(--sp-1) var(--sp-2);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--transition-fast);
}

input.rell-setting:focus,
select.rell-setting:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.15);
}

input.rell-setting::placeholder {
  color: var(--text-muted);
}

select.rell-setting {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238b949e'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: var(--sp-6);
}

input[type="checkbox"].rell-setting {
  width: auto;
  margin-right: var(--sp-2);
  accent-color: var(--accent);
  vertical-align: middle;
}

/* ----------------------------------------------------------
   18. CodeMirror Theme Overrides
   ---------------------------------------------------------- */
.CodeMirror {
  height: 100% !important;
  background: var(--bg-editor) !important;
  color: var(--text-primary) !important;
  font-family: var(--font-mono) !important;
  font-size: var(--text-sm) !important;
  line-height: 1.6 !important;
}

.CodeMirror-gutters {
  background: var(--bg-secondary) !important;
  border-right: 1px solid var(--border) !important;
}

.CodeMirror-linenumber {
  color: var(--text-muted) !important;
  font-size: var(--text-xs) !important;
}

.CodeMirror-cursor {
  border-left-color: var(--accent) !important;
  border-left-width: 2px !important;
}

.CodeMirror-selected {
  background: rgba(88, 166, 255, 0.15) !important;
}

.CodeMirror-focused .CodeMirror-selected {
  background: rgba(88, 166, 255, 0.25) !important;
}

.CodeMirror-matchingbracket {
  color: var(--accent) !important;
  background: rgba(88, 166, 255, 0.2) !important;
  border-bottom: 1px solid var(--accent) !important;
}

.CodeMirror-activeline-background {
  background: rgba(255, 255, 255, 0.03) !important;
}

.CodeMirror-scrollbar-filler {
  background: var(--bg-editor) !important;
}

[data-theme="light"] .CodeMirror-selected {
  background: rgba(9, 105, 218, 0.15) !important;
}

[data-theme="light"] .CodeMirror-focused .CodeMirror-selected {
  background: rgba(9, 105, 218, 0.25) !important;
}

[data-theme="light"] .CodeMirror-matchingbracket {
  color: var(--accent) !important;
  background: rgba(9, 105, 218, 0.15) !important;
  border-bottom-color: var(--accent) !important;
}

[data-theme="light"] .CodeMirror-activeline-background {
  background: rgba(0, 0, 0, 0.03) !important;
}

/* ----------------------------------------------------------
   19. Examples Page
   ---------------------------------------------------------- */
.examples-page {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-8) var(--sp-6);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.examples-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-8);
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.examples-header h1 {
  font-size: var(--text-xl);
  font-weight: 700;
}

.examples-search {
  padding: var(--sp-2) var(--sp-3);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-sm);
  width: 280px;
  max-width: 100%;
  outline: none;
  transition: border-color var(--transition-fast);
}

.examples-search::placeholder {
  color: var(--text-muted);
}

.examples-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.15);
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--sp-6);
}

.example-category-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.example-category-card:hover {
  border-color: var(--text-muted);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.category-header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4);
  border-bottom: 1px solid var(--border);
}

.category-icon {
  font-size: var(--text-lg);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.category-header h2 {
  font-size: var(--text-base);
  font-weight: 600;
}

.category-examples {
  padding: var(--sp-2);
}

.example-link {
  display: flex;
  align-items: center;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.example-link:hover {
  color: var(--accent);
  background: rgba(88, 166, 255, 0.08);
}

.example-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ----------------------------------------------------------
   20. Scrollbar Styling
   ---------------------------------------------------------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

::-webkit-scrollbar-corner {
  background: transparent;
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

/* ----------------------------------------------------------
   21. Animations
   ---------------------------------------------------------- */
@keyframes logFadeIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Theme transition on all color-bearing properties */
body,
.header,
.sidebar,
.editor-pane,
.output-pane,
.log-column,
.status-bar,
.settings-drawer,
.btn {
  transition: background-color var(--transition-normal), color var(--transition-normal), border-color var(--transition-normal);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ----------------------------------------------------------
   22. Responsive — Tablet (max-width: 1024px)
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }

  .sidebar {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: var(--status-bar-height);
    width: var(--sidebar-width);
    z-index: var(--z-sidebar);
    box-shadow: 4px 0 12px rgba(0, 0, 0, 0.3);
  }

  .sidebar.open {
    display: flex;
  }

  button.sidebar-toggle {
    display: inline-flex;
  }

  .resize-handle-h {
    display: none;
  }

  .log-column {
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 300px;
  }
}

/* ----------------------------------------------------------
   23. Responsive — Mobile (max-width: 768px)
   ---------------------------------------------------------- */
@media (max-width: 768px) {
  .main-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }

  .header {
    padding: 0 var(--sp-3);
    gap: var(--sp-2);
  }

  .header-nav {
    display: none;
  }

  .auth-controls {
    display: none;
  }

  .log-column {
    max-height: 250px;
  }

  .settings-drawer {
    width: 100%;
  }

  .editor-toolbar {
    padding: var(--sp-1) var(--sp-2);
  }

  .examples-page {
    padding: var(--sp-4) var(--sp-3);
  }

  .examples-grid {
    grid-template-columns: 1fr;
  }

  .examples-header {
    flex-direction: column;
    align-items: stretch;
  }

  .examples-search {
    width: 100%;
  }
}

/* ----------------------------------------------------------
   24. Utility
   ---------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#auth-status {
  text-transform: capitalize;
}