/* ═══════════════════════════════════════════════════════════════════════════
   CodeLab — Browser-Native Interactive System Design IDE & Guided Lab Engine
   Standalone & System Design In Depth Workbench Stylesheet
   Crafted to Linear / Zed / StackBlitz / Stripe Docs Desktop Standards
   ═══════════════════════════════════════════════════════════════════════════ */

:root,
[data-theme="dark"],
.codelab-workbench--dark,
.codelab[data-theme="dark"] {
  /* Ved Gupta Monochrome Neutral Design System — Dark (matches css/variables.css) */
  --cl-bg: var(--bg, #000000);
  --cl-bg-elevated: var(--surface, #0a0a0a);
  --cl-bg-panel: var(--surface-hover, #171717);
  --cl-bg-hover: var(--surface-hover, #171717);
  --cl-bg-active: var(--surface-active, #262626);

  /* Backwards-compatible surface aliases */
  --cl-surface: var(--cl-bg-elevated);
  --cl-surface-2: var(--cl-bg-panel);
  --cl-panel: var(--cl-bg-panel);
  --cl-hover: var(--cl-bg-hover);
  --cl-active: var(--cl-bg-active);

  /* Crisp 1px monochrome borders */
  --cl-border-subtle: var(--border-subtle, #171717);
  --cl-border: var(--border, #262626);
  --cl-border-strong: var(--border-strong, #404040);

  /* Monochrome foreground hierarchy */
  --cl-fg: var(--fg, #ffffff);
  --cl-fg-muted: var(--fg-muted, #a1a1a1);
  --cl-fg-faint: var(--fg-faint, #8f8f8f);
  --cl-fg-subtle: var(--cl-fg-faint);

  /* Primary monochrome accent + semantic status indicators */
  --cl-accent: var(--accent, #ffffff);
  --cl-accent-fg: var(--accent-fg, #000000);
  --cl-blue: var(--info, #54a2ff);
  --cl-blue-muted: rgba(84, 162, 255, 0.12);
  --cl-green: var(--success, #05df72);
  --cl-green-bright: var(--success, #05df72);
  --cl-green-muted: rgba(5, 223, 114, 0.12);
  --cl-amber: var(--warning, #ffd236);
  --cl-amber-muted: rgba(255, 210, 54, 0.12);
  --cl-red: var(--error, #fb2c36);
  --cl-red-muted: rgba(251, 44, 54, 0.12);
  --cl-purple: #a1a1a1;
  --cl-purple-muted: rgba(255, 255, 255, 0.08);

  /* GFM Callout Alert Tokens (Geist Dark) */
  --cl-callout-note: var(--cl-blue, #54a2ff);
  --cl-callout-note-bg: rgba(84, 162, 255, 0.08);
  --cl-callout-tip: var(--cl-green, #05df72);
  --cl-callout-tip-bg: rgba(5, 223, 114, 0.08);
  --cl-callout-important: #a855f7;
  --cl-callout-important-bg: rgba(168, 85, 247, 0.08);
  --cl-callout-warning: var(--cl-amber, #ffd236);
  --cl-callout-warning-bg: rgba(255, 210, 54, 0.08);
  --cl-callout-caution: var(--cl-red, #fb2c36);
  --cl-callout-caution-bg: rgba(251, 44, 54, 0.08);

  /* GFM Syntax Highlighting Tokens (Geist Dark) */
  --cl-tok-comment: #666666;
  --cl-tok-keyword: #ff7b72;
  --cl-tok-string: #a5d6ff;
  --cl-tok-number: #79c0ff;
  --cl-tok-type: #ffa657;
  --cl-tok-function: #d2a8ff;
  --cl-tok-punctuation: #8f8f8f;

  --cl-radius-sm: 4px;
  --cl-radius-md: 6px;
  --cl-radius-lg: 8px;
  --cl-font-sans: var(--font-sans, "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif);
  --cl-font-mono: var(--font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, monospace);
}

code-lab,
.codelab,
.codelab *,
.codelab *::before,
.codelab *::after,
.codelab-workbench,
.codelab-workbench *,
.codelab-workbench *::before,
.codelab-workbench *::after {
  box-sizing: border-box;
}

[data-theme="light"],
[data-theme="light"] .codelab,
.codelab[data-theme="light"],
.codelab-workbench--light {
  /* Ved Gupta Monochrome Neutral Design System — Light (matches css/variables.css) */
  --cl-bg: var(--bg, #ffffff);
  --cl-bg-elevated: var(--bg-alt, #fafafa);
  --cl-bg-panel: var(--surface-hover, #f5f5f5);
  --cl-bg-hover: var(--surface-hover, #f5f5f5);
  --cl-bg-active: var(--surface-active, #e5e5e5);

  --cl-surface: var(--cl-bg-elevated);
  --cl-surface-2: var(--cl-bg-panel);
  --cl-panel: var(--cl-bg-panel);
  --cl-hover: var(--cl-bg-hover);
  --cl-active: var(--cl-bg-active);

  --cl-border-subtle: var(--border-subtle, #f5f5f5);
  --cl-border: var(--border, #e5e5e5);
  --cl-border-strong: var(--border-strong, #d4d4d4);

  --cl-fg: var(--fg, #0a0a0a);
  --cl-fg-muted: var(--fg-muted, #525252);
  --cl-fg-faint: var(--fg-faint, #666666);
  --cl-fg-subtle: var(--cl-fg-faint);

  --cl-accent: var(--accent, #000000);
  --cl-accent-fg: var(--accent-fg, #ffffff);
  --cl-blue: var(--info, #1447e6);
  --cl-blue-muted: rgba(20, 71, 230, 0.08);
  --cl-green: var(--success, #008138);
  --cl-green-bright: var(--success, #008138);
  --cl-green-muted: rgba(0, 129, 56, 0.08);
  --cl-amber: var(--warning, #b75000);
  --cl-amber-muted: rgba(183, 80, 0, 0.08);
  --cl-red: var(--error, #e40014);
  --cl-red-muted: rgba(228, 0, 20, 0.08);
  --cl-purple: #525252;
  --cl-purple-muted: rgba(0, 0, 0, 0.06);

  /* GFM Callout Alert Tokens (Geist Light) */
  --cl-callout-note: var(--cl-blue, #1447e6);
  --cl-callout-note-bg: rgba(20, 71, 230, 0.06);
  --cl-callout-tip: var(--cl-green, #008138);
  --cl-callout-tip-bg: rgba(0, 129, 56, 0.06);
  --cl-callout-important: #8250df;
  --cl-callout-important-bg: rgba(130, 80, 223, 0.06);
  --cl-callout-warning: var(--cl-amber, #b75000);
  --cl-callout-warning-bg: rgba(183, 80, 0, 0.06);
  --cl-callout-caution: var(--cl-red, #e40014);
  --cl-callout-caution-bg: rgba(228, 0, 20, 0.06);

  /* GFM Syntax Highlighting Tokens (Geist Light) */
  --cl-tok-comment: #6e7781;
  --cl-tok-keyword: #cf222e;
  --cl-tok-string: #0a3069;
  --cl-tok-number: #0550ae;
  --cl-tok-type: #953800;
  --cl-tok-function: #8250df;
  --cl-tok-punctuation: #57606a;
}

/* ── Fullscreen Body Lock & Back Button ──────────────────────────────────── */
body.codelab-fullscreen-lock {
  overflow: hidden !important;
}

.codelab-btn--back {
  background: var(--cl-bg);
  border-color: var(--cl-border-strong);
  color: var(--cl-fg);
  font-weight: 500;
  padding: 5px 11px;
}

.codelab-btn--back:hover {
  background: var(--cl-bg-hover);
  border-color: var(--cl-fg-muted);
}

/* ── Main CodeLab Workbench Shell ────────────────────────────────────────── */
code-lab,
.codelab-root {
  display: block;
  width: 100%;
  font-family: var(--cl-font-sans);
  color: var(--cl-fg);
}

.codelab,
.codelab-workbench {
  --cl-guide-width: 380px;
  --cl-drawer-height: 240px;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: calc(100vh - 150px);
  min-height: 640px;
  max-height: 940px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}

.codelab.is-resizing,
.codelab-workbench.is-resizing {
  user-select: none !important;
  cursor: col-resize;
}

.codelab.is-resizing-row,
.codelab-workbench.is-resizing-row {
  user-select: none !important;
  cursor: row-resize;
}

.codelab.is-fullscreen,
.codelab-workbench.is-fullscreen {
  position: fixed !important;
  inset: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  max-height: none !important;
  border-radius: 0 !important;
  z-index: 9999 !important;
  border: none !important;
}

/* ── Top Workbench Toolbar (44px height, 0 14px horizontal padding) ───────── */
.codelab-topbar,
.codelab-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
  padding: 0 14px;
  background: var(--cl-bg-elevated);
  border-bottom: 1px solid var(--cl-border);
  gap: 12px;
  flex-shrink: 0;
  user-select: none;
}

.codelab-topbar__left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.codelab-toolbar__sep {
  width: 1px;
  height: 18px;
  background: var(--cl-border);
  flex-shrink: 0;
  margin: 0 2px;
}

.codelab-brand {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 5px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg);
  letter-spacing: -0.01em;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.codelab-brand__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cl-fg);
  flex-shrink: 0;
}

/* Mode Toggle: Guided Challenge vs Reference Sandbox */
.codelab-mode-switch {
  display: inline-flex;
  align-items: center;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 6px;
  padding: 2px;
  gap: 2px;
}

.codelab-mode-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 500;
  border-radius: 4px;
  color: var(--cl-fg-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color 120ms ease, background-color 120ms ease;
  white-space: nowrap;
}

.codelab-mode-btn:hover {
  color: var(--cl-fg);
}

.codelab-mode-btn.active {
  background: var(--cl-bg-active);
  color: var(--cl-fg);
  font-weight: 600;
}

/* Language Toggle: JS / TS */
.codelab-lang-switch {
  display: inline-flex;
  align-items: center;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 6px;
  padding: 2px;
  gap: 2px;
}

.codelab-lang-btn {
  font-family: var(--cl-font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 4px;
  color: var(--cl-fg-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 120ms ease;
}

.codelab-lang-btn:hover {
  color: var(--cl-fg);
}

.codelab-lang-btn.active[data-lang="js"],
.codelab-lang-btn.active[data-lang="ts"] {
  background: var(--cl-bg-active);
  color: var(--cl-fg);
}

.codelab-topbar__center {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.codelab-topbar__center::-webkit-scrollbar {
  display: none;
}

.codelab-step-pills {
  display: flex;
  align-items: center;
  gap: 5px;
}

.codelab-step-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 999px;
  font-family: var(--cl-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  font-weight: 500;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg-muted);
  cursor: pointer;
  transition: all 120ms ease;
  white-space: nowrap;
}

.codelab-step-pill:hover {
  border-color: var(--cl-border-strong);
  color: var(--cl-fg);
  background: var(--cl-bg-hover);
}

.codelab-step-pill.active {
  border-color: var(--cl-fg);
  color: var(--cl-accent-fg);
  background: var(--cl-accent);
  font-weight: 600;
}

.codelab-step-pill.passed {
  border-color: var(--cl-green);
  background: var(--cl-green-muted);
  color: var(--cl-green);
}

.codelab-step-pill.active.passed {
  border-color: var(--cl-green);
  background: var(--cl-green-muted);
  color: var(--cl-green);
  box-shadow: inset 0 0 0 1px var(--cl-green);
  font-weight: 600;
}

.codelab-topbar__right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.codelab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 11px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid var(--cl-border);
  background: var(--cl-bg);
  color: var(--cl-fg);
  cursor: pointer;
  transition: all 120ms ease;
  white-space: nowrap;
}

.codelab-btn:hover {
  background: var(--cl-bg-hover);
  border-color: var(--cl-border-strong);
}

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

.codelab-btn--run {
  background: var(--cl-bg-panel);
  border-color: var(--cl-border-strong);
  color: var(--cl-fg);
}

.codelab-btn--run:hover {
  background: var(--cl-bg-active);
  border-color: var(--cl-fg-muted);
}

.codelab-btn--stop {
  background: var(--cl-red-muted);
  border-color: var(--cl-red);
  color: var(--cl-red);
  font-weight: 600;
}

.codelab-btn--stop:hover {
  background: var(--cl-red);
  color: #ffffff;
}

.codelab-btn--ctrl-c {
  color: var(--cl-fg-muted);
  border-color: transparent;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.codelab-btn--ctrl-c:hover {
  color: var(--cl-fg);
  border-color: var(--cl-border);
}

.codelab-btn--ctrl-c.is-running {
  color: var(--cl-red);
  border-color: var(--cl-red);
  background: var(--cl-red-muted);
}

.codelab-btn--test {
  background: var(--cl-accent);
  border-color: var(--cl-accent);
  color: var(--cl-accent-fg);
  font-weight: 600;
}

.codelab-btn--test:hover {
  opacity: 0.9;
  background: var(--cl-accent);
  border-color: var(--cl-accent);
}

.codelab-btn--icon {
  padding: 0 7px;
  color: var(--cl-fg-muted);
}

.codelab-btn--icon:hover {
  color: var(--cl-fg);
}

.codelab-btn--icon.active,
.codelab-btn--icon[aria-pressed="true"] {
  color: var(--cl-fg);
  background: var(--cl-bg-elevated);
  border-color: var(--cl-border-strong);
}

.codelab-btn--subtle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 24px;
  padding: 0 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  background: transparent;
  border: 1px solid var(--cl-border);
  color: var(--cl-fg-muted);
  cursor: pointer;
  transition: all 120ms ease;
  white-space: nowrap;
}

.codelab-btn--subtle:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
  border-color: var(--cl-border-strong);
}

.codelab-btn__kbd {
  font-family: var(--cl-font-mono);
  font-size: 10px;
  opacity: 0.75;
  padding: 1px 4px;
  border-radius: 3px;
  background: rgba(128, 128, 128, 0.18);
  letter-spacing: -0.02em;
}

/* ── 3-Pane Split Body with Interactive Vertical Splitter ────────────────── */
.codelab-body {
  display: grid;
  grid-template-columns: var(--cl-guide-width, 380px) 5px 1fr;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  width: 100%;
}

.codelab.guide-collapsed .codelab-body,
.codelab-workbench.guide-collapsed .codelab-body,
.guide-collapsed .codelab-body {
  grid-template-columns: 1fr;
}

.codelab.guide-collapsed .codelab-main,
.codelab-workbench.guide-collapsed .codelab-main,
.guide-collapsed .codelab-main {
  grid-column: 1 / -1;
  width: 100%;
  min-width: 0;
}

.codelab.guide-collapsed .codelab-splitter-v,
.codelab.guide-collapsed .codelab-guide,
.codelab-workbench.guide-collapsed .codelab-splitter-v,
.codelab-workbench.guide-collapsed .codelab-guide,
.codelab-guide.collapsed {
  display: none !important;
}

.codelab-splitter-v {
  width: 5px;
  background: var(--cl-bg-elevated);
  border-right: 1px solid var(--cl-border);
  cursor: col-resize;
  position: relative;
  z-index: 10;
  transition: background 120ms ease;
}

.codelab-splitter-v:hover,
.codelab-splitter-v.is-dragging {
  background: var(--cl-border-strong);
}

.codelab-splitter-h {
  height: 5px;
  background: var(--cl-bg-elevated);
  border-top: 1px solid var(--cl-border);
  cursor: row-resize;
  flex-shrink: 0;
  position: relative;
  z-index: 10;
  transition: background 120ms ease;
}

.codelab-splitter-h:hover,
.codelab-splitter-h.is-dragging {
  background: var(--cl-border-strong);
}

/* ── Left Pane: Guided Curriculum & Architecture Brief ───────────────────── */
.codelab-guide,
.codelab-pane-left {
  display: flex;
  flex-direction: column;
  background: var(--cl-bg-elevated);
  border-right: 1px solid var(--cl-border);
  min-height: 0;
  overflow: hidden;
}

.codelab-guide__tabs {
  display: flex;
  align-items: center;
  height: 36px;
  border-bottom: 1px solid var(--cl-border);
  background: var(--cl-bg);
  padding: 0 12px;
  gap: 6px;
  flex-shrink: 0;
}

.codelab-guide__tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 500;
  color: var(--cl-fg-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 120ms ease;
}

.codelab-guide__tab:hover {
  color: var(--cl-fg);
}

.codelab-guide__tab.active {
  color: var(--cl-fg);
  box-shadow: inset 0 -2px 0 var(--cl-fg);
  font-weight: 600;
}

.codelab-guide__collapse-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: var(--cl-fg-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: all 120ms ease;
}

.codelab-guide__collapse-btn:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
  border-color: var(--cl-border);
}

.codelab-guide__collapse-btn:active {
  background: var(--cl-bg-elevated);
}

.codelab-guide__stepper {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--cl-border);
  background: var(--cl-bg-elevated);
  overflow-x: auto;
  white-space: nowrap;
  flex-shrink: 0;
  -webkit-overflow-scrolling: touch;
}

.codelab-guide__stepper::-webkit-scrollbar {
  display: none;
}

.codelab-guide__stepper .codelab-step-pills {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}

.codelab-guide__content {
  flex: 1;
  overflow-y: auto;
  padding: 20px 22px;
  font-size: 13.5px;
  line-height: 1.65;
}

.codelab-step-header {
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--cl-border);
}

.codelab-step-progress-bar {
  width: 100%;
  height: 3px;
  background: var(--cl-bg);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 10px;
}

.codelab-step-progress-bar__fill {
  height: 100%;
  background: var(--cl-fg);
  border-radius: 999px;
  transition: width 220ms ease;
}

.codelab-step-eyebrow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--cl-font-mono);
  font-size: 11px;
  color: var(--cl-fg-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.codelab-step-status {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 10.5px;
  font-weight: 600;
  background: var(--cl-bg-hover);
  color: var(--cl-fg-muted);
  text-transform: none;
  letter-spacing: 0;
}

.codelab-step-status.passed {
  background: var(--cl-green-muted);
  color: var(--cl-green);
  border: 1px solid var(--cl-green);
}

.codelab-step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--cl-fg);
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.codelab-step-targets {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
}

.codelab-step-target {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 5px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  color: var(--cl-fg);
  cursor: pointer;
  transition: border-color 120ms ease, background-color 120ms ease;
}

.codelab-step-target:hover {
  border-color: var(--cl-border-strong);
  background: var(--cl-bg-hover);
}

.codelab-step-target__sym {
  color: var(--cl-fg-muted);
  padding-left: 6px;
  border-left: 1px solid var(--cl-border);
}

.codelab-guide-prose {
  max-width: 65ch;
  font-family: var(--cl-font-sans);
  color: var(--cl-fg-muted);
  font-size: 13px;
  line-height: 1.6;
}

.codelab-guide-prose h1,
.codelab-guide-prose h2,
.codelab-guide-prose h3,
.codelab-guide-prose h4 {
  font-family: var(--cl-font-sans);
  color: var(--cl-fg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.codelab-guide-prose h1 { font-size: 15px; margin: 18px 0 8px; }
.codelab-guide-prose h2 { font-size: 14px; margin: 16px 0 8px; }
.codelab-guide-prose h3 { font-size: 13px; margin: 14px 0 6px; }
.codelab-guide-prose h4 { font-size: 12px; margin: 12px 0 4px; }

.codelab-guide-prose p {
  margin: 0 0 12px;
  line-height: 1.65;
}

.codelab-guide-prose ul,
.codelab-guide-prose ol {
  margin: 8px 0 14px 18px;
  padding-left: 0;
  color: var(--cl-fg-muted);
}

.codelab-guide-prose ul { list-style: disc; }
.codelab-guide-prose ol { list-style: decimal; }

.codelab-guide-prose li {
  margin-bottom: 6px;
  line-height: 1.6;
}

.codelab-guide-prose .codelab-table-wrap {
  margin: 12px 0;
}

.codelab-guide-prose .codelab-table th,
.codelab-guide-prose .codelab-table td {
  padding: 6px 10px;
  font-size: 12px;
}

.codelab-guide-prose code:not(.codelab-code-block__code) {
  font-family: var(--cl-font-mono);
  font-size: 12px;
  padding: 1.5px 5px;
  border-radius: var(--cl-radius-sm);
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg);
}

.codelab-guide-prose pre:not(.codelab-code-block__pre) {
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 6px;
  padding: 12px 14px;
  overflow-x: auto;
  margin: 12px 0;
  line-height: 1.55;
}

.codelab-guide-prose pre:not(.codelab-code-block__pre) code {
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
}

.codelab-guide-prose a {
  color: var(--cl-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  transition: color 0.12s ease;
}

.codelab-guide-prose a:hover {
  color: var(--cl-fg);
}

/* Step checklist inside guide */
.codelab-step-checks {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 6px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
}

.codelab-step-checks__title {
  font-family: var(--cl-font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cl-fg-faint);
  margin-bottom: 8px;
}

.codelab-check-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 5px 0;
  font-size: 12.5px;
  color: var(--cl-fg-muted);
}

.codelab-check-item.pass {
  color: var(--cl-green);
}

.codelab-check-item.fail {
  color: var(--cl-red);
}

.codelab-check-icon {
  font-family: var(--cl-font-mono);
  font-weight: 600;
  flex-shrink: 0;
}

/* Step Concept Callout Card (1px perimeter border, zero side-stripe) */
.codelab-step-concept {
  margin-bottom: 16px;
  padding: 12px 14px;
  border-radius: 6px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--cl-fg-muted);
}

.codelab-step-concept__label {
  display: inline-block;
  font-family: var(--cl-font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cl-fg);
  margin-bottom: 4px;
}

/* Hint & Solution Accordion */
.codelab-hint-box {
  margin-top: 16px;
  border: 1px solid var(--cl-border);
  border-radius: 6px;
  background: var(--cl-bg);
  overflow: hidden;
}

.codelab-hint-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--cl-fg);
  background: var(--cl-bg-hover);
  border: none;
  cursor: pointer;
}

.codelab-hint-body {
  padding: 12px 14px;
  font-size: 12.5px;
  color: var(--cl-fg-muted);
  border-top: 1px solid var(--cl-border);
  display: none;
}

.codelab-hint-box.open .codelab-hint-body {
  display: block;
}

.codelab-guide__footer {
  display: flex;
  flex-direction: column;
  padding: 10px 14px;
  border-top: 1px solid var(--cl-border);
  background: var(--cl-bg);
  gap: 8px;
  flex-shrink: 0;
}

.codelab-guide__footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
}

.codelab-guide__footer-row--secondary {
  justify-content: flex-start;
  gap: 6px;
}

/* ── Right Pane: Editor + Bottom Console/Test Split ──────────────────────── */
.codelab-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--cl-bg);
}

.codelab-workspace {
  display: grid;
  grid-template-columns: var(--cl-explorer-width, 196px) 4px 1fr;
  flex: 1;
  min-height: 160px;
  overflow: hidden;
}

.codelab.files-collapsed .codelab-workspace {
  grid-template-columns: 0px 0px 1fr;
}

.codelab.files-collapsed .codelab-splitter-files {
  display: none;
}

/* Explorer Resize Splitter */
.codelab-splitter-files {
  width: 4px;
  background: transparent;
  cursor: col-resize;
  position: relative;
  z-index: 6;
  transition: background 120ms ease;
}

.codelab-splitter-files:hover,
.codelab-splitter-files.is-dragging {
  background: var(--cl-border-strong);
}

/* File Explorer Sidebar */
.codelab-explorer {
  display: flex;
  flex-direction: column;
  background: var(--cl-bg-elevated);
  border-right: 1px solid var(--cl-border);
  overflow-y: auto;
  user-select: none;
}

.codelab-explorer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 36px;
  padding: 0 12px;
  font-family: var(--cl-font-mono);
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cl-fg-faint);
  border-bottom: 1px solid var(--cl-border);
  flex-shrink: 0;
}

.codelab-explorer__list {
  padding: 8px 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.codelab-file-item {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  padding: 6px 9px;
  border-radius: 5px;
  border: 1px solid transparent;
  background: transparent;
  font-family: var(--cl-font-mono);
  font-size: 12px;
  color: var(--cl-fg-muted);
  text-align: left;
  cursor: pointer;
  transition: background 100ms ease, color 100ms ease, border-color 100ms ease;
}

.codelab-file-item:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
}

.codelab-file-item.active {
  background: var(--cl-bg-hover);
  border-color: var(--cl-border-strong);
  color: var(--cl-fg);
  font-weight: 600;
}

.codelab-file-badge {
  margin-left: auto;
  font-size: 9.5px;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--cl-bg-panel);
  color: var(--cl-fg-muted);
  border: 1px solid var(--cl-border-subtle);
}

.codelab-explorer__actions {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-left: auto;
  margin-right: 8px;
}

.codelab-explorer__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--cl-fg-muted);
  cursor: pointer;
  padding: 0;
  transition: all 120ms ease;
}

.codelab-explorer__btn:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
  border-color: var(--cl-border);
}

.codelab-folder-item {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 5px 8px;
  border-radius: 5px;
  border: 1px solid transparent;
  background: transparent;
  font-family: var(--cl-font-mono);
  font-size: 12px;
  color: var(--cl-fg);
  text-align: left;
  cursor: pointer;
  transition: background 100ms ease, border-color 100ms ease;
  position: relative;
}

.codelab-folder-item:hover {
  background: var(--cl-bg-hover);
}

.codelab-folder-item.drag-over {
  background: var(--cl-bg-hover);
  border-color: var(--cl-accent);
  outline: 1px dashed var(--cl-accent);
}

.codelab-chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--cl-fg-faint);
  cursor: pointer;
  flex-shrink: 0;
  border-radius: 3px;
}

.codelab-chevron:hover {
  color: var(--cl-fg);
  background: var(--cl-bg-panel);
}

.codelab-folder-icon {
  display: inline-flex;
  align-items: center;
  color: var(--cl-fg-muted);
  flex-shrink: 0;
}

.codelab-folder-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.codelab-node-actions {
  display: none;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.codelab-folder-item:hover .codelab-node-actions {
  display: inline-flex;
}

.codelab-node-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  padding: 0;
  border-radius: 3px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--cl-fg-muted);
  cursor: pointer;
}

.codelab-node-action:hover {
  background: var(--cl-bg-panel);
  color: var(--cl-fg);
  border-color: var(--cl-border);
}

.codelab-file-icon {
  display: inline-flex;
  align-items: center;
  color: var(--cl-fg-faint);
  flex-shrink: 0;
}

.codelab-file-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.codelab-tree-create-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
}

.codelab-tree-create-icon {
  display: inline-flex;
  align-items: center;
  color: var(--cl-fg-muted);
  flex-shrink: 0;
}

.codelab-tree-input {
  flex: 1;
  height: 24px;
  padding: 0 6px;
  border-radius: var(--cl-radius-sm);
  border: 1px solid var(--cl-border-strong);
  background: var(--cl-bg);
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  outline: none;
}

.codelab-tree-input:focus {
  border-color: var(--cl-accent);
}

/* Editor Column */
.codelab-editor-col {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--cl-bg);
}

/* File Tab Bar (36px height, file badges, + New File, 📦 Packages) */
.codelab-tabs,
.codelab-file-tabs {
  display: flex;
  align-items: center;
  height: 36px;
  background: var(--cl-bg-elevated);
  border-bottom: 1px solid var(--cl-border);
  overflow-x: auto;
  flex-shrink: 0;
  scrollbar-width: none;
}

.codelab-tabs::-webkit-scrollbar,
.codelab-file-tabs::-webkit-scrollbar {
  display: none;
}

.codelab-tab {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 100%;
  padding: 0 13px;
  font-family: var(--cl-font-mono);
  font-size: 12px;
  color: var(--cl-fg-muted);
  border: none;
  border-right: 1px solid var(--cl-border);
  background: var(--cl-bg-elevated);
  cursor: pointer;
  white-space: nowrap;
  transition: all 100ms ease;
}

.codelab-tab:hover {
  color: var(--cl-fg);
  background: var(--cl-bg-hover);
}

.codelab-tab.active {
  color: var(--cl-fg);
  background: var(--cl-bg);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--cl-fg);
}

.codelab-tab__ext {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--cl-font-mono);
  font-size: 9.5px;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 3px;
  letter-spacing: -0.02em;
}

.codelab-tab__ext--js {
  background: var(--cl-amber-muted);
  color: var(--cl-amber);
}

.codelab-tab__ext--ts {
  background: var(--cl-blue-muted);
  color: var(--cl-blue);
}

.codelab-tab__ext--json {
  background: var(--cl-purple-muted);
  color: var(--cl-purple);
}

.codelab-tab__ext--md {
  background: var(--cl-bg-panel);
  color: var(--cl-fg-muted);
}

.codelab-tab__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cl-blue);
}

.codelab-tab__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: var(--cl-radius-sm);
  font-size: 13px;
  line-height: 1;
  color: var(--cl-fg-faint);
  margin-left: 4px;
  cursor: pointer;
  background: transparent;
  border: none;
  transition: all 120ms ease;
}

.codelab-tab__close:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
}

.codelab-tab-add {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 24px;
  padding: 0 8px;
  margin-left: 6px;
  border-radius: 5px;
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  color: var(--cl-fg-muted);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 100ms ease;
  white-space: nowrap;
}

.codelab-tab-add:hover {
  color: var(--cl-fg);
  background: var(--cl-bg-hover);
  border-color: var(--cl-border);
}

.codelab-new-file-form {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 8px;
  height: 100%;
}

.codelab-new-file-input {
  height: 24px;
  width: 145px;
  padding: 0 8px;
  border-radius: 4px;
  border: 1px solid var(--cl-border-strong);
  background: var(--cl-bg);
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  outline: none;
}

.codelab-new-file-input:focus {
  border-color: var(--cl-blue);
}

.codelab-tabs__right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  flex-shrink: 0;
}

.codelab-pkg-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 24px;
  padding: 0 8px;
  border-radius: 5px;
  font-family: var(--cl-font-mono);
  font-size: 11px;
  color: var(--cl-fg-muted);
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  cursor: pointer;
  transition: all 120ms ease;
  white-space: nowrap;
}

.codelab-pkg-btn:hover {
  color: var(--cl-fg);
  border-color: var(--cl-border-strong);
  background: var(--cl-bg-hover);
}

.codelab-pkg-btn__count {
  padding: 0 5px;
  border-radius: 999px;
  font-size: 10px;
  background: var(--cl-blue-muted);
  color: var(--cl-blue);
  font-weight: 600;
}

/* Monaco Container & Resilient Line-Numbered Fallback */
.codelab-editor-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  width: 100%;
  overflow: hidden;
}

.codelab-monaco-host {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.codelab-target-line-highlight {
  background: rgba(88, 166, 255, 0.14) !important;
}

.codelab-fallback-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  width: 100%;
  height: 100%;
  background: var(--cl-bg);
  overflow: hidden;
}

.codelab-fallback-gutter {
  width: 48px;
  padding: 14px 10px 14px 0;
  background: var(--cl-bg-elevated);
  border-right: 1px solid var(--cl-border);
  color: var(--cl-fg-faint);
  font-family: var(--cl-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  line-height: 1.6;
  text-align: right;
  user-select: none;
  overflow: hidden;
  flex-shrink: 0;
  white-space: pre;
}

.codelab-fallback-editor {
  flex: 1;
  width: 100%;
  height: 100%;
  padding: 14px 18px;
  background: var(--cl-bg);
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 13px;
  line-height: 1.6;
  border: none;
  outline: none;
  resize: none;
  tab-size: 2;
  white-space: pre;
  overflow: auto;
}

/* ── 2. Active Markdown File Preview Pane (#cl-md-preview, .codelab-md-preview) */
.codelab-md-preview {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  padding: 28px 36px;
  background: var(--cl-bg);
  color: var(--cl-fg);
  font-family: var(--cl-font-sans);
  font-size: 13.5px;
  line-height: 1.65;
  box-sizing: border-box;
  -webkit-overflow-scrolling: touch;
}

.codelab-md-preview > * {
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.codelab-md-preview h1,
.codelab-md-preview h2,
.codelab-md-preview h3,
.codelab-md-preview h4,
.codelab-md-preview h5,
.codelab-md-preview h6 {
  color: var(--cl-fg);
  font-family: var(--cl-font-sans);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.codelab-md-preview h1 {
  font-size: 22px;
  font-weight: 700;
  margin: 24px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--cl-border);
}

.codelab-md-preview h1:first-child {
  margin-top: 0;
}

.codelab-md-preview h2 {
  font-size: 17px;
  margin: 22px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--cl-border-subtle);
}

.codelab-md-preview h3 {
  font-size: 14.5px;
  margin: 18px 0 8px;
}

.codelab-md-preview h4 {
  font-size: 13.5px;
  margin: 14px 0 6px;
}

.codelab-md-preview p {
  margin: 0 0 14px;
  color: var(--cl-fg-muted);
}

.codelab-md-preview ul,
.codelab-md-preview ol {
  margin: 10px 0 16px 22px;
  padding-left: 0;
  color: var(--cl-fg-muted);
}

.codelab-md-preview ul { list-style: disc; }
.codelab-md-preview ol { list-style: decimal; }

.codelab-md-preview li {
  margin-bottom: 6px;
  line-height: 1.6;
}

.codelab-md-preview hr {
  border: none;
  border-top: 1px solid var(--cl-border);
  margin: 24px 0;
}

.codelab-md-preview img {
  max-width: 100%;
  height: auto;
  border-radius: var(--cl-radius-md);
  border: 1px solid var(--cl-border);
  margin: 12px 0;
}

.codelab-md-preview a {
  color: var(--cl-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  transition: color 0.12s ease;
}

.codelab-md-preview a:hover {
  color: var(--cl-fg);
}

.codelab-md-preview code:not(.codelab-code-block__code) {
  font-family: var(--cl-font-mono);
  font-size: 12px;
  padding: 2px 5px;
  border-radius: var(--cl-radius-sm);
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg);
}

.codelab-md-preview pre:not(.codelab-code-block__pre) {
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  padding: 12px 14px;
  overflow-x: auto;
  margin: 14px 0;
  font-family: var(--cl-font-mono);
  font-size: 12.5px;
  line-height: 1.55;
}

.codelab-md-preview pre:not(.codelab-code-block__pre) code {
  background: none;
  border: none;
  padding: 0;
}

@media (max-width: 680px) {
  .codelab-md-preview {
    padding: 16px 18px;
  }
}

/* ── Empty Editor State (Geist Monochrome) ────────────────────────────────── */
.codelab-empty-editor {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  background: var(--cl-bg);
  padding: 24px;
  overflow: auto;
  z-index: 2;
}

.codelab-empty-editor__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 440px;
  width: 100%;
}

.codelab-empty-editor__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--cl-radius-md);
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg-muted);
  margin-bottom: 16px;
}

.codelab-empty-editor__title {
  font-family: var(--cl-font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--cl-fg);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.codelab-empty-editor__subtitle {
  font-family: var(--cl-font-sans);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--cl-fg-muted);
  margin: 0 0 20px;
}

.codelab-empty-editor__watermark {
  font-family: var(--cl-font-sans);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cl-fg-faint);
  opacity: 0.45;
  margin-bottom: 22px;
  user-select: none;
}

.codelab-empty-editor__shortcuts {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 22px;
  min-width: 260px;
}

.codelab-empty-shortcut {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 7px 12px;
  border-radius: var(--cl-radius-sm);
  background: transparent;
  border: 1px solid transparent;
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-sans);
  font-size: 12.5px;
  cursor: pointer;
  transition: all 120ms ease;
}

.codelab-empty-shortcut:hover {
  background: var(--cl-bg-hover);
  border-color: var(--cl-border);
  color: var(--cl-fg);
}

.codelab-empty-shortcut kbd {
  font-family: var(--cl-font-mono);
  font-size: 11px;
  color: var(--cl-fg-muted);
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: 4px;
  padding: 1px 6px;
}

/* ── Bottom Drawer: Tests, Terminal REPL, Virtual Disk & Network ─────────── */
.codelab-drawer,
.codelab-bottom {
  display: flex;
  flex-direction: column;
  height: var(--cl-drawer-height, 240px);
  min-height: 110px;
  max-height: 70%;
  background: var(--cl-bg-elevated);
  flex-shrink: 0;
}

.codelab-drawer.is-minimized,
.codelab-bottom.is-minimized {
  height: 36px !important;
  min-height: 36px !important;
}

.codelab-drawer__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: 36px;
  padding: 0 14px;
  background: var(--cl-bg);
  border-bottom: 1px solid var(--cl-border);
  flex-shrink: 0;
  user-select: none;
  min-width: 0;
}

/* Keep the Clear / minimize controls pinned while the tab strip scrolls. */
.codelab-drawer__bar > div:last-child {
  flex-shrink: 0;
}

/* On narrow/guided layouts, drop the tab pill badges so labels never wrap. */
@media (max-width: 720px) {
  .codelab-drawer__tab .codelab-drawer__pill {
    display: none;
  }
}

.codelab-drawer__tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 100%;
  flex: 1 1 auto;
  flex-wrap: nowrap;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.codelab-drawer__tabs::-webkit-scrollbar {
  display: none;
}

.codelab-drawer__tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  padding: 0 11px;
  font-size: 12px;
  font-weight: 500;
  color: var(--cl-fg-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 100ms ease;
  flex-shrink: 0;
  white-space: nowrap;
}

.codelab-drawer__tab:hover {
  color: var(--cl-fg);
}

.codelab-drawer__tab.active {
  color: var(--cl-fg);
  box-shadow: inset 0 -2px 0 var(--cl-fg);
  font-weight: 600;
}

.codelab-drawer__pill {
  font-family: var(--cl-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 10.5px;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--cl-bg-hover);
  color: var(--cl-fg-muted);
}

.codelab-drawer__pill.pass {
  background: var(--cl-green-muted);
  color: var(--cl-green);
}

.codelab-drawer__pill.fail {
  background: var(--cl-red-muted);
  color: var(--cl-red);
}

.codelab-drawer__body,
.codelab-bottom-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 14px 18px;
  font-family: var(--cl-font-mono);
  font-size: 12.5px;
}

/* Test Results Grid (Zero side-stripes, crisp 1px semantic borders) */
.codelab-test-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  margin-bottom: 12px;
  border-radius: 7px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  font-family: var(--cl-font-sans);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
}

.codelab-test-summary.all-pass {
  border-color: rgba(16, 185, 129, 0.4);
  background: var(--cl-green-muted);
}

.codelab-test-summary.has-fail {
  border-color: rgba(244, 63, 94, 0.4);
  background: var(--cl-red-muted);
}

.codelab-test-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.codelab-test-row {
  display: flex;
  flex-direction: column;
  padding: 8px 12px;
  border-radius: 6px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
}

.codelab-test-row.pass {
  border-color: rgba(16, 185, 129, 0.35);
  background: rgba(16, 185, 129, 0.04);
}

.codelab-test-row.fail {
  border-color: rgba(244, 63, 94, 0.35);
  background: rgba(244, 63, 94, 0.04);
}

.codelab-test-row__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.codelab-test-row__name {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--cl-fg);
  font-size: 12px;
}

.codelab-test-row__time {
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--cl-fg-faint);
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--cl-bg-elevated);
}

.codelab-test-row__err {
  margin-top: 8px;
  padding: 9px 12px;
  border-radius: 5px;
  background: var(--cl-red-muted);
  border: 1px solid rgba(244, 63, 94, 0.28);
  color: var(--cl-red);
  font-size: 11.5px;
  white-space: pre-wrap;
  word-break: break-word;
}

.codelab-test-diff {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 6px 0;
  padding: 6px 9px;
  border-radius: 4px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  font-family: var(--cl-font-mono);
  font-size: 11px;
}

.codelab-test-diff__row {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.codelab-test-diff__row.expected {
  color: var(--cl-green);
}

.codelab-test-diff__row.actual {
  color: var(--cl-red);
}

.codelab-test-diff__label {
  font-weight: 600;
  min-width: 72px;
  flex-shrink: 0;
}

.codelab-test-diff__val {
  white-space: pre-wrap;
  word-break: break-all;
}

.codelab-btn--primary {
  background: var(--cl-accent);
  border-color: var(--cl-accent);
  color: var(--cl-accent-fg);
  font-weight: 600;
}

.codelab-btn--primary:hover {
  opacity: 0.92;
  background: var(--cl-accent);
  border-color: var(--cl-accent);
}

/* Terminal Output & Interactive REPL */
.codelab-terminal {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  cursor: text;
}

.codelab-terminal__log {
  white-space: normal;
  word-break: break-word;
  line-height: 1.45;
  color: var(--cl-fg);
}

.codelab-log-line {
  white-space: pre-wrap;
  padding: 1px 0;
  margin: 0;
}

.codelab-log-line.stderr {
  color: var(--cl-red);
}

.codelab-log-line.system {
  color: var(--cl-blue);
}

.codelab-log-line.success {
  color: var(--cl-green);
}

.codelab-repl {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
  padding: 2px 0;
}

.codelab-repl__prompt {
  color: var(--cl-green);
  font-weight: 600;
  user-select: none;
  flex-shrink: 0;
}

.codelab-repl__input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 12.5px;
  padding: 0;
}

/* Exit Lab / Close Workbench button in topbar */
.codelab-btn--exit-lab,
#cl-close-ide-btn.codelab-btn--exit-lab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 10px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border-strong);
  border-radius: 5px;
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-sans);
  font-size: 11.5px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 120ms ease;
  flex-shrink: 0;
}

.codelab-btn--exit-lab .codelab-btn__label {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 500;
  color: inherit;
}

.codelab-btn--close-ide:hover,
.codelab-btn--exit-lab:hover,
#cl-close-ide-btn:hover {
  color: var(--cl-red) !important;
  border-color: var(--cl-red) !important;
  background: var(--cl-red-muted) !important;
}

@media (max-width: 680px) {
  .codelab-btn--exit-lab .codelab-btn__label {
    display: none;
  }
  .codelab-btn--exit-lab {
    padding: 0 7px;
  }
}

/* Virtual Disk & Network Inspector */
.codelab-inspector-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.codelab-inspector-card {
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 7px;
  padding: 12px 14px;
}

.codelab-inspector-card__title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cl-fg-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.codelab-vfs-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 7px 10px;
  border-radius: 5px;
  border: 1px solid var(--cl-border);
  margin-bottom: 6px;
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
}

.codelab-vfs-item__head {
  display: flex;
  justify-content: space-between;
  color: var(--cl-blue);
  font-weight: 600;
}

.codelab-vfs-item__hex {
  font-size: 10.5px;
  color: var(--cl-fg-faint);
  overflow-x: auto;
  white-space: pre;
}

/* ── Sleek 26px IDE Status Bar Footer (.codelab-statusbar) ───────────────── */
.codelab-statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 26px;
  padding: 0 12px;
  background: var(--cl-bg);
  border-top: 1px solid var(--cl-border);
  font-family: var(--cl-font-mono);
  font-size: 11px;
  color: var(--cl-fg-muted);
  user-select: none;
  flex-shrink: 0;
  gap: 12px;
}

.codelab-statusbar__left,
.codelab-statusbar__right {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.codelab-statusbar__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.codelab-statusbar__sep {
  width: 1px;
  height: 12px;
  background: var(--cl-border);
}

.codelab-statusbar__dot {
  width: 6.5px;
  height: 6.5px;
  border-radius: 50%;
  background: var(--cl-green);
  flex-shrink: 0;
}

.codelab-statusbar__dot.is-running {
  background: var(--cl-amber);
  animation: clStatusPulse 900ms infinite ease-in-out;
}

.codelab-statusbar__dot.is-fetching {
  background: var(--cl-blue);
  animation: clStatusPulse 900ms infinite ease-in-out;
}

.codelab-statusbar__dot.is-error {
  background: var(--cl-red);
}

.codelab-statusbar__save.is-failed {
  color: var(--cl-amber);
  font-weight: 500;
}

@keyframes clStatusPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.85); }
}

/* Solution / Diff & NPM Packages Modal inside CodeLab */
.codelab-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 10, 15, 0.72);
  backdrop-filter: blur(4px);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.codelab-modal {
  width: 100%;
  max-width: 860px;
  max-height: 85%;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border-strong);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
}

.codelab-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--cl-bg);
  border-bottom: 1px solid var(--cl-border);
  font-weight: 600;
  font-size: 13.5px;
}

.codelab-modal__body {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  font-family: var(--cl-font-mono);
  font-size: 12px;
  line-height: 1.6;
}

.codelab-pkg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(195px, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.codelab-pkg-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 11px;
  border-radius: 6px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  cursor: pointer;
  transition: all 120ms ease;
}

.codelab-pkg-chip:hover {
  border-color: var(--cl-blue);
  background: var(--cl-blue-muted);
}

/* ── Editor Breadcrumbs Bar (Geist Monochrome) ─────────────────────────── */
.codelab-breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 26px;
  padding: 0 12px;
  background: var(--cl-bg-elevated);
  border-bottom: 1px solid var(--cl-border);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  color: var(--cl-fg-muted);
  user-select: none;
  overflow: visible;
}

.codelab-guide__expand-btn {
  display: none;
  align-items: center;
  gap: 5px;
  height: 20px;
  padding: 0 7px;
  font-size: 11px;
  font-family: var(--cl-font-sans);
  font-weight: 500;
  color: var(--cl-fg-muted);
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 4px;
  cursor: pointer;
  flex-shrink: 0;
  margin-right: 6px;
  transition: all 120ms ease;
}

.codelab-guide__expand-btn:hover {
  color: var(--cl-fg);
  border-color: var(--cl-border-strong);
  background: var(--cl-bg-hover);
}

.codelab.guide-collapsed .codelab-guide__expand-btn,
.codelab-workbench.guide-collapsed .codelab-guide__expand-btn,
.guide-collapsed .codelab-guide__expand-btn {
  display: inline-flex;
}

.codelab-breadcrumbs__left {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1 1 auto;
}

.codelab-breadcrumbs__path {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

.codelab-breadcrumbs__path::-webkit-scrollbar {
  display: none;
}

.codelab-breadcrumbs__item--folder {
  color: var(--cl-fg-muted);
}

.codelab-breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 5px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.codelab-breadcrumbs__item:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
}

.codelab-breadcrumbs__item--root {
  color: var(--cl-fg-subtle);
  cursor: default;
}

.codelab-breadcrumbs__item--file {
  color: var(--cl-fg);
  font-weight: 500;
}

.codelab-breadcrumbs__item--symbol {
  color: var(--cl-fg-muted);
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  cursor: default;
}

.codelab-breadcrumbs__sep {
  display: inline-flex;
  align-items: center;
  color: var(--cl-fg-subtle);
  opacity: 0.7;
}

.codelab-breadcrumbs__actions {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

/* ── Workspace Folder Switcher (breadcrumb dropdown) ───────────────────── */
.codelab-folder-switcher {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.codelab-folder-switcher__toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 20px;
  padding: 0 7px;
  border: 1px solid var(--cl-border);
  border-radius: 4px;
  background: var(--cl-bg);
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-sans);
  font-size: 11px;
  cursor: pointer;
  white-space: nowrap;
  box-sizing: border-box;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.codelab-folder-switcher__toggle:hover,
.codelab-folder-switcher.is-open .codelab-folder-switcher__toggle {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
  border-color: var(--cl-border-strong);
}

.codelab-folder-switcher__toggle.is-scoped {
  color: var(--cl-fg);
  border-color: var(--cl-border-strong);
}

.codelab-folder-switcher__label {
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.codelab-folder-switcher__menu {
  position: absolute;
  top: calc(100% + 5px);
  left: 0;
  z-index: 90;
  min-width: 230px;
  max-width: 340px;
  max-height: 300px;
  overflow-y: auto;
  padding: 4px;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border-strong);
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.codelab-folder-switcher__section {
  padding: 4px 8px 6px;
  font-family: var(--cl-font-sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cl-fg-subtle);
}

.codelab-folder-switcher__option {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 5px 8px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  text-align: left;
  cursor: pointer;
}

.codelab-folder-switcher__option:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
}

.codelab-folder-switcher__option.active {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
  font-weight: 600;
}

.codelab-folder-switcher__icon {
  display: inline-flex;
  flex-shrink: 0;
  color: var(--cl-fg-subtle);
}

.codelab-folder-switcher__name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.codelab-folder-switcher__path {
  margin-left: auto;
  padding-left: 12px;
  color: var(--cl-fg-subtle);
  font-size: 10px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.codelab-folder-switcher__empty {
  padding: 8px;
  font-size: 11px;
  color: var(--cl-fg-muted);
}

/* Scoped-explorer "back to workspace" row */
.codelab-scope-up {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 5px 10px;
  margin-bottom: 2px;
  border: none;
  border-bottom: 1px dashed var(--cl-border);
  background: transparent;
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  text-align: left;
  cursor: pointer;
}

.codelab-scope-up:hover {
  color: var(--cl-fg);
  background: var(--cl-bg-hover);
}

.codelab-scope-up__arrow {
  color: var(--cl-fg-subtle);
}

.codelab-breadcrumb__btn,
.codelab-breadcrumbs__btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 20px;
  line-height: 1;
  padding: 0 7px;
  border: 1px solid var(--cl-border);
  border-radius: 4px;
  background: var(--cl-bg);
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-sans);
  font-size: 11px;
  cursor: pointer;
  white-space: nowrap;
  box-sizing: border-box;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}

.codelab-breadcrumb__btn:hover,
.codelab-breadcrumbs__btn:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
  border-color: var(--cl-border-strong);
}

.codelab-breadcrumb__kbd {
  font-family: var(--cl-font-mono);
  font-size: 10px;
  line-height: 1;
  padding: 1px 3px;
  border-radius: 2px;
  background: rgba(128, 128, 128, 0.2);
  color: var(--cl-fg-muted);
  border: none;
  box-shadow: none;
}

/* ── VS Code Command Palette & Quick Open ──────────────────────────────── */
.codelab-palette-backdrop {
  position: absolute;
  inset: 0;
  z-index: 95;
  display: flex;
   align-items: flex-start;
  justify-content: center;
  padding-top: 48px;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(2px);
}

.codelab-palette {
  width: min(560px, 92%);
  max-height: min(400px, 78%);
  display: flex;
  flex-direction: column;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border-strong);
  border-radius: var(--cl-radius-md);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
  overflow: hidden;
}

.codelab-palette__header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--cl-border);
  background: var(--cl-bg);
}

.codelab-palette__icon {
  display: inline-flex;
  color: var(--cl-fg-muted);
}

.codelab-palette__input {
  flex: 1;
  height: 26px;
  border: none;
  background: transparent;
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 12.5px;
  outline: none;
}

.codelab-palette__hint {
  font-family: var(--cl-font-mono);
  font-size: 10.5px;
  color: var(--cl-fg-subtle);
  padding: 2px 6px;
  border: 1px solid var(--cl-border);
  border-radius: 4px;
}

.codelab-palette__list {
  flex: 1;
  overflow-y: auto;
  padding: 4px;
}

.codelab-palette__item {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 10px;
  border: none;
  border-radius: var(--cl-radius-sm);
  background: transparent;
  color: var(--cl-fg);
  font-family: var(--cl-font-sans);
  font-size: 12.5px;
  text-align: left;
  cursor: pointer;
}

.codelab-palette__item:hover,
.codelab-palette__item.is-selected {
  background: var(--cl-bg-active);
  color: var(--cl-fg);
}

.codelab-palette__item-kbd {
  font-family: var(--cl-font-mono);
  font-size: 11px;
  color: var(--cl-fg-muted);
  padding: 1px 6px;
  border: 1px solid var(--cl-border);
  border-radius: 4px;
  background: var(--cl-bg);
}

.codelab-palette__empty {
  padding: 16px;
  text-align: center;
  color: var(--cl-fg-muted);
  font-size: 12px;
}

/* ── Right-Click Context Menu ──────────────────────────────────────────── */
.codelab-context-menu {
  position: fixed;
  z-index: 100;
  min-width: 195px;
  padding: 4px;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border-strong);
  border-radius: var(--cl-radius-sm);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
}

.codelab-context-menu__item {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 6px 10px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--cl-fg);
  font-family: var(--cl-font-sans);
  font-size: 12px;
  text-align: left;
  cursor: pointer;
}

.codelab-context-menu__item:hover {
  background: var(--cl-bg-active);
}

.codelab-context-menu__item.is-danger {
  color: var(--cl-red);
}

.codelab-context-menu__kbd {
  font-family: var(--cl-font-mono);
  font-size: 10.5px;
  color: var(--cl-fg-subtle);
}

.codelab-context-menu__divider {
  height: 1px;
  margin: 4px 2px;
  background: var(--cl-border);
}

/* ── Inline & Side-by-Side Diff Viewer ─────────────────────────────────── */
.codelab-diff-modal {
  width: min(940px, 95%);
  max-height: min(680px, 88%);
}

.codelab-diff-body {
  padding: 0;
  background: var(--cl-bg);
}

.codelab-diff-stats {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
}

.codelab-diff-stat--add {
  color: var(--cl-green);
  font-weight: 600;
}

.codelab-diff-stat--del {
  color: var(--cl-red);
  font-weight: 600;
}

.codelab-diff-unified {
  display: flex;
  flex-direction: column;
  font-family: var(--cl-font-mono);
  font-size: 12px;
  line-height: 1.55;
}

.codelab-diff-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  font-family: var(--cl-font-mono);
  font-size: 12px;
  line-height: 1.55;
}

.codelab-diff-pane {
  overflow-x: auto;
  border-right: 1px solid var(--cl-border);
}

.codelab-diff-pane:last-child {
  border-right: none;
}

.codelab-diff-pane__title {
  padding: 6px 12px;
  background: var(--cl-bg-elevated);
  border-bottom: 1px solid var(--cl-border);
  color: var(--cl-fg-muted);
  font-size: 11px;
  font-weight: 600;
}

.codelab-diff-line {
  display: flex;
  align-items: baseline;
  padding: 1px 10px;
  white-space: pre;
}

.codelab-diff-line--add {
  background: rgba(34, 197, 94, 0.12);
  color: var(--cl-fg);
}

.codelab-diff-line--del {
  background: rgba(239, 68, 68, 0.12);
  color: var(--cl-fg-muted);
}

.codelab-diff-gutter {
  display: inline-block;
  width: 32px;
  flex-shrink: 0;
  color: var(--cl-fg-subtle);
  text-align: right;
  padding-right: 8px;
  user-select: none;
  font-size: 11px;
}

.codelab-diff-prefix {
  display: inline-block;
  width: 16px;
  flex-shrink: 0;
  user-select: none;
  font-weight: 600;
}

.codelab-diff-code {
  flex: 1;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Responsive adjustments */
@media (max-width: 1360px) {
  .codelab-brand--with-back {
    display: none;
  }
}

@media (max-width: 1024px) {
  .codelab-body {
    grid-template-columns: 1fr;
  }
  .codelab-splitter-v {
    display: none;
  }
  .codelab-guide,
  .codelab-pane-left {
    max-height: 250px;
    border-right: none;
    border-bottom: 1px solid var(--cl-border);
  }
  .codelab-workspace {
    grid-template-columns: 155px 4px 1fr;
  }
  .codelab-inspector-grid {
    grid-template-columns: 1fr;
  }
  .codelab-diff-split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .codelab-workspace {
    grid-template-columns: 1fr;
  }
  .codelab-explorer,
  .codelab-splitter-files {
    display: none;
  }
  .codelab-topbar__center {
    display: none;
  }
  .codelab-statusbar__right {
    display: none;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   Milestone 4: Interactive PTY Terminal, Ports & Network Trace UI Components
   ═══════════════════════════════════════════════════════════════════════════ */

/* PTY Terminal Active Line & Blinking Block Cursor */
.codelab-pty__active-line {
  display: flex;
  align-items: center;
  font-family: var(--cl-font-mono);
  font-size: 12.5px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: 2px;
  padding: 2px 0;
}

.codelab-pty__prompt {
  color: var(--cl-green);
  font-weight: 600;
  user-select: none;
  margin-right: 4px;
  flex-shrink: 0;
}

.codelab-pty__before,
.codelab-pty__after {
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
}

.codelab-pty__cursor {
  display: inline-block;
  min-width: 7.5px;
  height: 14px;
  background-color: var(--cl-fg);
  color: var(--cl-bg);
  vertical-align: middle;
  line-height: 14px;
  text-align: center;
  font-family: var(--cl-font-mono);
  font-size: 12.5px;
}

.codelab-pty__cursor.blink {
  animation: clPtyCursorBlink 1s step-end infinite;
}

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

/* ANSI 16/256 SGR Escape Color Classes */
.cl-ansi-bold { font-weight: 700; }
.cl-ansi-dim { opacity: 0.65; }
.cl-ansi-italic { font-style: italic; }
.cl-ansi-underline { text-decoration: underline; }
.cl-ansi-black { color: #171717; }
.cl-ansi-red { color: var(--cl-red, #fb2c36); }
.cl-ansi-green { color: var(--cl-green, #05df72); }
.cl-ansi-yellow { color: var(--cl-amber, #ffd236); }
.cl-ansi-blue { color: var(--cl-blue, #54a2ff); }
.cl-ansi-magenta { color: #d946ef; }
.cl-ansi-cyan { color: #06b6d4; }
.cl-ansi-white { color: #f5f5f5; }
.cl-ansi-gray { color: #737373; }
.cl-ansi-bright-red { color: #ff5252; }
.cl-ansi-bright-green { color: #69f0ae; }
.cl-ansi-bright-yellow { color: #ffff00; }
.cl-ansi-bright-blue { color: #40c4ff; }
.cl-ansi-bright-magenta { color: #ff4081; }
.cl-ansi-bright-cyan { color: #18ffff; }
.cl-ansi-bright-white { color: #ffffff; }

.cl-ansi-bg-black { background-color: #171717; }
.cl-ansi-bg-red { background-color: rgba(251, 44, 54, 0.22); }
.cl-ansi-bg-green { background-color: rgba(5, 223, 114, 0.22); }
.cl-ansi-bg-yellow { background-color: rgba(255, 210, 54, 0.22); }
.cl-ansi-bg-blue { background-color: rgba(84, 162, 255, 0.22); }
.cl-ansi-bg-magenta { background-color: rgba(217, 70, 239, 0.22); }
.cl-ansi-bg-cyan { background-color: rgba(6, 182, 212, 0.22); }
.cl-ansi-bg-white { background-color: rgba(255, 255, 255, 0.22); }

/* Ports & HTTP Preview Drawer Tab */
.codelab-ports-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 4px 0 12px;
}

.codelab-ports-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.codelab-ports-section__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--cl-border-subtle);
}

.codelab-ports-section__title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--cl-fg);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.codelab-ports-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md, 6px);
  background: var(--cl-bg-elevated);
}

.codelab-ports-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  text-align: left;
}

.codelab-ports-table th {
  padding: 8px 12px;
  background: var(--cl-bg-panel);
  color: var(--cl-fg-muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--cl-border);
}

.codelab-ports-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--cl-border-subtle);
  color: var(--cl-fg);
  vertical-align: middle;
}

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

.codelab-port-badge {
  display: inline-block;
  padding: 2px 6px;
  border-radius: var(--cl-radius-sm, 4px);
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  font-family: var(--cl-font-mono);
  font-weight: 600;
  font-size: 11px;
  color: var(--cl-blue);
}

.codelab-proto-badge {
  display: inline-block;
  padding: 1px 5px;
  border-radius: var(--cl-radius-sm, 4px);
  background: var(--cl-bg-panel);
  font-family: var(--cl-font-mono);
  font-size: 10px;
  color: var(--cl-fg-muted);
}

.codelab-port-link {
  color: var(--cl-fg);
  text-decoration: none;
  font-family: var(--cl-font-mono);
}

.codelab-port-link:hover {
  text-decoration: underline;
  color: var(--cl-blue);
}

.codelab-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 500;
}

.codelab-status-pill.online {
  color: var(--cl-green);
}

.codelab-dot-pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--cl-green);
  box-shadow: 0 0 6px var(--cl-green);
}

/* Mini HTTP Client */
.codelab-http-client-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.codelab-http-client-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.codelab-http-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md, 6px);
}

.codelab-http-input-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.codelab-http-select {
  padding: 5px 8px;
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm, 4px);
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 12px;
  font-weight: 600;
  outline: none;
}

.codelab-http-url-input {
  flex: 1;
  padding: 5px 8px;
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm, 4px);
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 12px;
  outline: none;
}

.codelab-http-url-input:focus,
.codelab-http-select:focus,
.codelab-http-textarea:focus {
  border-color: var(--cl-accent);
}

.codelab-http-details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.codelab-http-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.codelab-http-label {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--cl-fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.codelab-http-textarea {
  width: 100%;
  padding: 6px 8px;
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm, 4px);
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  resize: vertical;
  outline: none;
}

/* HTTP Response Inspector */
.codelab-http-response-panel {
  display: flex;
  flex-direction: column;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md, 6px);
  overflow: hidden;
}

.codelab-http-response-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 8px;
  background: var(--cl-bg-panel);
  border-bottom: 1px solid var(--cl-border);
}

.codelab-http-tab {
  padding: 3px 8px;
  background: transparent;
  border: none;
  border-radius: var(--cl-radius-sm, 4px);
  color: var(--cl-fg-muted);
  font-size: 11.5px;
  font-weight: 500;
  cursor: pointer;
}

.codelab-http-tab.active {
  background: var(--cl-bg-elevated);
  color: var(--cl-fg);
  font-weight: 600;
}

.codelab-http-response-body {
  flex: 1;
  padding: 10px;
  overflow: auto;
  max-height: 240px;
}

.codelab-http-preview-frame {
  width: 100%;
  min-height: 180px;
  border: none;
  background: #ffffff;
  border-radius: var(--cl-radius-sm, 4px);
}

.codelab-http-raw-pre {
  margin: 0;
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  color: var(--cl-fg);
  white-space: pre-wrap;
  word-break: break-word;
}

.codelab-http-no-response {
  color: var(--cl-fg-muted);
  font-size: 12px;
  text-align: center;
  padding: 30px 10px;
}

/* Network Trace Panel & Waterfall */
.codelab-network-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px 0 12px;
}

.codelab-network-filterbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md, 6px);
}

.codelab-net-filter-search {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  color: var(--cl-fg-muted);
}

.codelab-net-search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--cl-fg);
  font-size: 12px;
  font-family: var(--cl-font-sans);
}

.codelab-net-select {
  padding: 3px 8px;
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm, 4px);
  color: var(--cl-fg);
  font-size: 11.5px;
  outline: none;
}

.codelab-network-content {
  display: flex;
  gap: 12px;
}

.codelab-network-content.has-detail .codelab-network-table-wrap {
  flex: 3;
}

.codelab-network-table-wrap {
  flex: 1;
  overflow-x: auto;
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md, 6px);
  background: var(--cl-bg-elevated);
}

.codelab-network-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  text-align: left;
}

.codelab-network-table th {
  padding: 8px 10px;
  background: var(--cl-bg-panel);
  color: var(--cl-fg-muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--cl-border);
}

.codelab-network-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--cl-border-subtle);
  color: var(--cl-fg);
  vertical-align: middle;
}

.codelab-net-row {
  cursor: pointer;
  transition: background 0.12s ease;
}

.codelab-net-row:hover {
  background: var(--cl-bg-hover);
}

.codelab-net-row.selected {
  background: var(--cl-bg-active);
}

.codelab-status-badge {
  display: inline-block;
  padding: 1px 6px;
  border-radius: var(--cl-radius-sm, 4px);
  font-family: var(--cl-font-mono);
  font-size: 11px;
  font-weight: 600;
}

.codelab-status-badge.status-2xx {
  background: var(--cl-green-muted);
  color: var(--cl-green);
  border: 1px solid rgba(5, 223, 114, 0.25);
}

.codelab-status-badge.status-3xx {
  background: var(--cl-blue-muted);
  color: var(--cl-blue);
  border: 1px solid rgba(84, 162, 255, 0.25);
}

.codelab-status-badge.status-4xx {
  background: var(--cl-amber-muted);
  color: var(--cl-amber);
  border: 1px solid rgba(255, 210, 54, 0.25);
}

.codelab-status-badge.status-5xx,
.codelab-status-badge.status-0xx {
  background: var(--cl-red-muted);
  color: var(--cl-red);
  border: 1px solid rgba(251, 44, 54, 0.25);
}

.codelab-method-badge {
  display: inline-block;
  font-family: var(--cl-font-mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.02em;
}

.codelab-net-path {
  font-family: var(--cl-font-mono);
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.codelab-waterfall-track {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 110px;
}

.codelab-waterfall-bar {
  height: 6px;
  background: var(--cl-blue);
  border-radius: 3px;
  min-width: 6px;
}

.codelab-waterfall-time {
  font-family: var(--cl-font-mono);
  font-size: 10.5px;
  color: var(--cl-fg-muted);
}

.codelab-network-detail {
  flex: 2;
  display: flex;
  flex-direction: column;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md, 6px);
  padding: 10px;
  max-height: 280px;
  overflow-y: auto;
}

.codelab-network-detail__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--cl-border-subtle);
  margin-bottom: 8px;
}

.codelab-detail-section {
  margin-bottom: 8px;
  font-size: 11.5px;
}

.codelab-detail-label {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--cl-fg-muted);
  text-transform: uppercase;
  margin-bottom: 3px;
}

.codelab-detail-pre {
  margin: 4px 0 0;
  padding: 6px;
  background: var(--cl-bg-panel);
  border-radius: var(--cl-radius-sm, 4px);
  font-family: var(--cl-font-mono);
  font-size: 11px;
  color: var(--cl-fg);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.codelab-empty-cell {
  text-align: center;
  padding: 24px !important;
  color: var(--cl-fg-muted);
  font-style: italic;
}

/* Bright ANSI Background Classes (SGR 100-107) */
.cl-ansi-bg-gray { background-color: rgba(115, 115, 115, 0.28); }
.cl-ansi-bg-bright-red { background-color: rgba(255, 82, 82, 0.28); }
.cl-ansi-bg-bright-green { background-color: rgba(105, 240, 174, 0.28); }
.cl-ansi-bg-bright-yellow { background-color: rgba(255, 255, 0, 0.28); }
.cl-ansi-bg-bright-blue { background-color: rgba(64, 196, 255, 0.28); }
.cl-ansi-bg-bright-magenta { background-color: rgba(255, 64, 129, 0.28); }
.cl-ansi-bg-bright-cyan { background-color: rgba(24, 255, 255, 0.28); }
.cl-ansi-bg-bright-white { background-color: rgba(255, 255, 255, 0.35); }

/* Guided Step Pills & Tab Extension Modifiers */
.codelab-step-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--cl-border);
  background: var(--cl-bg);
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-mono);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all 120ms ease;
}

.codelab-step-pill:hover {
  border-color: var(--cl-border-strong);
  color: var(--cl-fg);
}

.codelab-step-pill.active {
  background: var(--cl-bg-active);
  border-color: var(--cl-border-strong);
  color: var(--cl-fg);
  font-weight: 600;
}

.codelab-step-pill.done {
  border-color: var(--cl-green);
  color: var(--cl-green);
}

.codelab-step-pill__num {
  font-weight: 700;
}

.codelab-tab__ext--js { color: var(--cl-amber); }
.codelab-tab__ext--ts { color: var(--cl-blue); }
.codelab-tab__ext--json { color: var(--cl-green); }
.codelab-tab__ext--md { color: var(--cl-fg-muted); }


/* ═══════════════════════════════════════════════════════════════════════════
   GFM Markdown Engine Component Styles
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Tables ─────────────────────────────────────────────────────────────── */
.codelab-table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  margin: 16px 0;
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  background: var(--cl-bg);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--cl-border-strong) transparent;
}

.codelab-table-wrap::-webkit-scrollbar {
  height: 6px;
}

.codelab-table-wrap::-webkit-scrollbar-track {
  background: transparent;
}

.codelab-table-wrap::-webkit-scrollbar-thumb {
  background: var(--cl-border-strong);
  border-radius: 3px;
}

.codelab-table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
  font-family: var(--cl-font-sans);
  font-size: 13px;
  line-height: 1.5;
  text-align: left;
}

.codelab-table th {
  background: var(--cl-bg-panel);
  color: var(--cl-fg);
  font-weight: 600;
  padding: 8px 12px;
  border-bottom: 1px solid var(--cl-border);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.codelab-table td {
  padding: 8px 12px;
  color: var(--cl-fg-muted);
  border-bottom: 1px solid var(--cl-border-subtle);
  vertical-align: top;
}

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

.codelab-table tbody tr {
  transition: background 0.12s ease;
}

.codelab-table tbody tr:hover td {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
}

.codelab-table th[align="left"],
.codelab-table td[align="left"] {
  text-align: left;
}

.codelab-table th[align="center"],
.codelab-table td[align="center"] {
  text-align: center;
}

.codelab-table th[align="right"],
.codelab-table td[align="right"] {
  text-align: right;
}

/* Fallback for unwrapped tables in guide prose or preview */
.codelab-guide-prose table:not(.codelab-table),
.codelab-md-preview table:not(.codelab-table) {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 14px 0;
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  overflow: hidden;
}

.codelab-guide-prose table:not(.codelab-table) th,
.codelab-md-preview table:not(.codelab-table) th {
  background: var(--cl-bg-panel);
  color: var(--cl-fg);
  padding: 8px 12px;
  font-weight: 600;
  border-bottom: 1px solid var(--cl-border);
}

.codelab-guide-prose table:not(.codelab-table) td,
.codelab-md-preview table:not(.codelab-table) td {
  padding: 8px 12px;
  color: var(--cl-fg-muted);
  border-bottom: 1px solid var(--cl-border-subtle);
}

/* ── GitHub Callout Alert Boxes ──────────────────────────────────────────── */
.codelab-callout {
  margin: 16px 0;
  padding: 12px 14px;
  border-radius: var(--cl-radius-md);
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  border-left-width: 3.5px;
  border-left-style: solid;
  position: relative;
  box-sizing: border-box;
}

.codelab-callout--note {
  border-left-color: var(--cl-callout-note);
  background: var(--cl-callout-note-bg);
}

.codelab-callout--tip {
  border-left-color: var(--cl-callout-tip);
  background: var(--cl-callout-tip-bg);
}

.codelab-callout--important {
  border-left-color: var(--cl-callout-important);
  background: var(--cl-callout-important-bg);
}

.codelab-callout--warning {
  border-left-color: var(--cl-callout-warning);
  background: var(--cl-callout-warning-bg);
}

.codelab-callout--caution {
  border-left-color: var(--cl-callout-caution);
  background: var(--cl-callout-caution-bg);
}

.codelab-callout__header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 12px;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
  user-select: none;
}

.codelab-callout--note .codelab-callout__header { color: var(--cl-callout-note); }
.codelab-callout--tip .codelab-callout__header { color: var(--cl-callout-tip); }
.codelab-callout--important .codelab-callout__header { color: var(--cl-callout-important); }
.codelab-callout--warning .codelab-callout__header { color: var(--cl-callout-warning); }
.codelab-callout--caution .codelab-callout__header { color: var(--cl-callout-caution); }

.codelab-callout__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.codelab-callout__icon svg {
  width: 14px;
  height: 14px;
  display: block;
}

.codelab-callout__title {
  line-height: 1;
}

.codelab-callout__content {
  color: var(--cl-fg-muted);
  font-size: 12.5px;
  line-height: 1.6;
}

.codelab-callout__content p {
  margin: 0 0 6px 0;
}

.codelab-callout__content p:last-child {
  margin-bottom: 0;
}

.codelab-callout__content code {
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  padding: 1.5px 4.5px;
  border-radius: var(--cl-radius-sm);
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg);
}

/* ── Standard Blockquotes ───────────────────────────────────────────────── */
.codelab-blockquote {
  margin: 16px 0;
  padding: 8px 14px;
  border-left: 3px solid var(--cl-border-strong);
  background: var(--cl-bg-elevated);
  border-radius: 0 var(--cl-radius-sm) var(--cl-radius-sm) 0;
  color: var(--cl-fg-muted);
  font-size: 13px;
  line-height: 1.6;
  font-style: italic;
}

.codelab-blockquote p {
  margin: 0 0 6px 0;
}

.codelab-blockquote p:last-child {
  margin-bottom: 0;
}

/* ── Task Lists ─────────────────────────────────────────────────────────── */
.codelab-task-list {
  list-style: none !important;
  padding-left: 0 !important;
  margin: 10px 0 !important;
}

.codelab-task-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 3px 0;
  color: var(--cl-fg-muted);
  font-size: 13px;
  line-height: 1.5;
  transition: color 0.12s ease;
}

.codelab-task-item:hover {
  color: var(--cl-fg);
}

.codelab-task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  margin-top: 2.5px;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  border: 1px solid var(--cl-border-strong);
  border-radius: var(--cl-radius-sm);
  background: var(--cl-bg);
  cursor: pointer;
  display: inline-grid;
  place-content: center;
  transition: all 0.15s ease;
}

.codelab-task-checkbox:hover {
  border-color: var(--cl-fg-muted);
  background: var(--cl-bg-hover);
}

.codelab-task-checkbox:checked {
  background: var(--cl-accent);
  border-color: var(--cl-accent);
}

.codelab-task-checkbox:checked::before {
  content: "";
  width: 8px;
  height: 4.5px;
  border-left: 1.8px solid var(--cl-accent-fg);
  border-bottom: 1.8px solid var(--cl-accent-fg);
  transform: rotate(-45deg) translate(0.5px, -0.5px);
}

.codelab-task-checkbox:focus-visible {
  outline: 2px solid var(--cl-blue);
  outline-offset: 1px;
}

.codelab-task-item--checked {
  color: var(--cl-fg-faint);
  text-decoration: line-through;
}

.codelab-task-item--checked > span,
.codelab-task-item--checked .codelab-task-text {
  color: var(--cl-fg-faint);
  text-decoration: line-through;
}

.codelab-task-list .codelab-task-list {
  padding-left: 20px !important;
  margin: 4px 0 !important;
}

/* ── Code Blocks with Header Bar & 1-Click Copy Button ──────────────────── */
.codelab-code-block {
  margin: 16px 0;
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  background: var(--cl-bg);
  overflow: hidden;
  position: relative;
}

.codelab-code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--cl-bg-panel);
  border-bottom: 1px solid var(--cl-border);
  font-family: var(--cl-font-mono);
  font-size: 11px;
  user-select: none;
}

.codelab-code-block__lang {
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--cl-fg-faint);
  font-size: 11px;
}

.codelab-copy-code-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: var(--cl-radius-sm);
  border: 1px solid var(--cl-border);
  background: var(--cl-bg);
  color: var(--cl-fg-muted);
  font-size: 11px;
  font-family: var(--cl-font-sans);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 1.2;
}

.codelab-copy-code-btn:hover {
  background: var(--cl-bg-hover);
  color: var(--cl-fg);
  border-color: var(--cl-border-strong);
}

.codelab-copy-code-btn:active {
  background: var(--cl-bg-active);
}

.codelab-copy-code-btn.copied {
  color: var(--cl-green);
  border-color: var(--cl-green);
  background: var(--cl-green-muted);
}

.codelab-copy-code-btn svg {
  flex-shrink: 0;
  transition: transform 0.15s ease;
}

.codelab-copy-code-btn.copied svg {
  stroke: var(--cl-green);
}

.codelab-code-block__pre {
  margin: 0;
  padding: 12px 14px;
  overflow-x: auto;
  background: var(--cl-bg);
  font-family: var(--cl-font-mono);
  font-size: 12px;
  line-height: 1.55;
  tab-size: 2;
  border: none;
  border-radius: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--cl-border-strong) transparent;
}

.codelab-code-block__pre::-webkit-scrollbar {
  height: 6px;
}

.codelab-code-block__pre::-webkit-scrollbar-thumb {
  background: var(--cl-border-strong);
  border-radius: 3px;
}

.codelab-code-block__code {
  font-family: inherit;
  font-size: inherit;
  color: var(--cl-fg);
  background: none !important;
  border: none !important;
  padding: 0 !important;
  white-space: pre;
  word-break: normal;
  word-spacing: normal;
}

/* ── Syntax Highlighting Tokens (Geist Monochrome) ──────────────────────── */
.cl-tok-comment {
  color: var(--cl-tok-comment, #666666);
  font-style: italic;
}

.cl-tok-keyword {
  color: var(--cl-tok-keyword, #ff7b72);
  font-weight: 500;
}

.cl-tok-string {
  color: var(--cl-tok-string, #a5d6ff);
}

.cl-tok-number {
  color: var(--cl-tok-number, #79c0ff);
}

.cl-tok-type {
  color: var(--cl-tok-type, #ffa657);
}

.cl-tok-function {
  color: var(--cl-tok-function, #d2a8ff);
}

.cl-tok-punctuation {
  color: var(--cl-tok-punctuation, #8f8f8f);
}

/* Light Theme Overrides (Explicit Selectors for Max Specificity) */
[data-theme="light"] .cl-tok-comment,
.codelab-workbench--light .cl-tok-comment,
.codelab[data-theme="light"] .cl-tok-comment {
  color: var(--cl-tok-comment, #6e7781);
}

[data-theme="light"] .cl-tok-keyword,
.codelab-workbench--light .cl-tok-keyword,
.codelab[data-theme="light"] .cl-tok-keyword {
  color: var(--cl-tok-keyword, #cf222e);
}

[data-theme="light"] .cl-tok-string,
.codelab-workbench--light .cl-tok-string,
.codelab[data-theme="light"] .cl-tok-string {
  color: var(--cl-tok-string, #0a3069);
}

[data-theme="light"] .cl-tok-number,
.codelab-workbench--light .cl-tok-number,
.codelab[data-theme="light"] .cl-tok-number {
  color: var(--cl-tok-number, #0550ae);
}

[data-theme="light"] .cl-tok-type,
.codelab-workbench--light .cl-tok-type,
.codelab[data-theme="light"] .cl-tok-type {
  color: var(--cl-tok-type, #953800);
}

[data-theme="light"] .cl-tok-function,
.codelab-workbench--light .cl-tok-function,
.codelab[data-theme="light"] .cl-tok-function {
  color: var(--cl-tok-function, #8250df);
}

[data-theme="light"] .cl-tok-punctuation,
.codelab-workbench--light .cl-tok-punctuation,
.codelab[data-theme="light"] .cl-tok-punctuation {
  color: var(--cl-tok-punctuation, #57606a);
}

/* ── Inline Spans, Links & Code Chips ───────────────────────────────────── */
.codelab-link {
  color: var(--cl-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  transition: color 0.12s ease;
}

.codelab-link:hover {
  color: var(--cl-fg);
}

.codelab-inline-code {
  font-family: var(--cl-font-mono);
  font-size: 12px;
  padding: 1.5px 5px;
  border-radius: var(--cl-radius-sm);
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border);
  color: var(--cl-fg);
}

.codelab-hr {
  border: none;
  border-top: 1px solid var(--cl-border);
  margin: 20px 0;
}

/* ═══════════════════════════════════════════════════════════════════════════
   M3: Port Toast Notifications & Dual In-Browser Web Preview
   ═══════════════════════════════════════════════════════════════════════════ */

.codelab-toast-container {
  position: absolute;
  right: 16px;
  bottom: 16px;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 340px;
  pointer-events: none;
}

.codelab-toast {
  pointer-events: auto;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px;
  background: var(--cl-bg-elevated);
  border: 1px solid var(--cl-border-strong);
  border-radius: var(--cl-radius-md);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.55);
  animation: codelab-toast-in 160ms ease-out;
}

@keyframes codelab-toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.codelab-toast--info .codelab-toast__icon { color: var(--cl-blue); }

.codelab-toast--error {
  border-color: var(--cl-red);
}

.codelab-toast--error .codelab-toast__icon { color: var(--cl-red); }

.codelab-toast__icon {
  color: var(--cl-green);
  flex: 0 0 auto;
  margin-top: 1px;
}

.codelab-toast__body { flex: 1 1 auto; min-width: 0; }

.codelab-toast__title {
  font-size: 13px;
  font-weight: 600;
  color: var(--cl-fg);
}

.codelab-toast__meta {
  font-size: 11px;
  color: var(--cl-fg-muted);
  font-family: var(--cl-font-mono);
  margin-top: 3px;
  word-break: break-all;
}

.codelab-toast__actions { margin-top: 8px; }

.codelab-toast__close {
  flex: 0 0 auto;
  background: none;
  border: none;
  color: var(--cl-fg-muted);
  cursor: pointer;
  padding: 0 2px;
  line-height: 1;
}

.codelab-toast__close:hover { color: var(--cl-fg); }

/* Web Preview surface */
.codelab-preview {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  gap: 8px;
}

.codelab-preview-chrome {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
  padding: 6px 8px;
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  flex-shrink: 0;
}

.codelab-preview-nav { display: flex; gap: 2px; flex: 0 0 auto; }

.codelab-preview-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: transparent;
  color: var(--cl-fg-muted);
  border: 1px solid transparent;
  border-radius: var(--cl-radius-sm);
  cursor: pointer;
}

.codelab-preview-btn:hover:not(:disabled) { background: var(--cl-bg-hover); color: var(--cl-fg); }
.codelab-preview-btn.active { background: var(--cl-bg-active); color: var(--cl-fg); border-color: var(--cl-border-strong); }
.codelab-preview-btn:disabled { opacity: 0.35; cursor: default; }

.codelab-preview-port-select {
  flex: 0 1 auto;
  height: 28px;
  background: var(--cl-bg-elevated);
  color: var(--cl-fg);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm);
  font-size: 12px;
  padding: 0 6px;
  max-width: 170px;
}

.codelab-preview-split .codelab-preview-port-select {
  max-width: 118px;
}

.codelab-preview-url-input {
  flex: 1 1 160px;
  min-width: 120px;
  height: 28px;
  background: var(--cl-bg);
  color: var(--cl-fg);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm);
  font-family: var(--cl-font-mono);
  font-size: 12px;
  padding: 0 8px;
}

.codelab-preview-url-input:focus { outline: none; border-color: var(--cl-border-strong); }

.codelab-preview-modes { display: flex; gap: 2px; flex: 0 0 auto; }

/* CSP badge: which remote hosts the current preview may reach. */
.codelab-preview-csp {
  flex: 0 1 auto;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 11px;
  line-height: 18px;
  padding: 0 8px;
  border-radius: 999px;
  border: 1px solid var(--cl-border);
  color: var(--cl-fg-muted);
  background: var(--cl-bg-elevated);
}

.codelab-preview-split .codelab-preview-csp {
  max-width: 110px;
}

/* The split pane is narrower than the drawer, so the single-row chrome would
   clip its right-hand controls. Wrap instead, and give the URL its own row. */
.codelab-preview-split .codelab-preview-chrome {
  flex-wrap: wrap;
  row-gap: 4px;
}

.codelab-preview-split .codelab-preview-url-input {
  order: 10;
  flex: 1 1 100%;
}

/* Icon-only pop-out keeps the split chrome to two rows. */
.codelab-preview-split [data-cl-action="preview-popout"] {
  padding: 0 6px;
}

.codelab-preview-split [data-cl-action="preview-popout"] > span {
  display: none;
}

.codelab-preview-csp--blocked {
  color: var(--cl-red);
  border-color: var(--cl-red);
}

.codelab-preview-viewport {
  flex: 1 1 auto;
  min-height: 120px;
  display: flex;
  justify-content: center;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  overflow: auto;
}

.codelab-preview-iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: #ffffff;
}

.codelab-preview-viewport--tablet .codelab-preview-iframe {
  width: 768px;
  max-width: 100%;
  border-left: 1px solid var(--cl-border);
  border-right: 1px solid var(--cl-border);
}

.codelab-preview-viewport--mobile .codelab-preview-iframe {
  width: 375px;
  max-width: 100%;
  border-left: 1px solid var(--cl-border);
  border-right: 1px solid var(--cl-border);
}

.codelab-preview-hint {
  font-size: 11px;
  color: var(--cl-fg-faint);
}

.codelab-preview-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 28px 20px;
  text-align: center;
  border-top: 1px solid var(--cl-border);
  background: var(--cl-bg-subtle, transparent);
}

.codelab-preview-empty__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: var(--cl-accent, #4f9cf9);
  background: color-mix(in srgb, var(--cl-accent, #4f9cf9) 14%, transparent);
}

.codelab-preview-empty__title {
  font-size: 13px;
  font-weight: 600;
  color: var(--cl-fg);
}

.codelab-preview-empty__text {
  max-width: 440px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--cl-fg-muted);
}

.codelab-preview-empty__text code,
.codelab-preview-empty__hint code {
  font-family: var(--cl-font-mono);
  font-size: 11px;
  padding: 1px 5px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--cl-fg, #fff) 8%, transparent);
}

.codelab-preview-empty__hint {
  font-size: 11px;
  color: var(--cl-fg-faint);
}

/* ── Split-Pane Web Preview, Maximize Mode & Inline Console ─────────────── */
.codelab-workspace.has-preview-split {
  grid-template-columns: var(--cl-explorer-width, 196px) 4px minmax(260px, 1fr) 5px minmax(240px, var(--cl-preview-split-width, 44%));
}

.codelab.files-collapsed .codelab-workspace.has-preview-split {
  grid-template-columns: 0px 0px minmax(260px, 1fr) 5px minmax(240px, var(--cl-preview-split-width, 44%));
}

.codelab-preview-split {
  display: none;
  flex-direction: column;
  width: 100%;
  /* Width comes from the grid track so the pane can shrink with the viewport. */
  min-width: 0;
  height: 100%;
  background: var(--cl-bg-panel);
  border-left: 1px solid var(--cl-border);
  overflow: hidden;
  flex-shrink: 0;
}

.codelab-splitter-preview {
  display: none;
  width: 5px;
  cursor: col-resize;
  background: transparent;
  transition: background 120ms ease;
  flex-shrink: 0;
  z-index: 5;
}

.codelab-splitter-preview:hover,
.codelab-splitter-preview.is-dragging {
  background: var(--cl-accent, #3b82f6);
}

.codelab-preview-split .codelab-preview {
  padding: 8px;
  height: 100%;
  box-sizing: border-box;
}

.codelab-preview.is-maximized {
  position: fixed !important;
  inset: 12px !important;
  z-index: 9999 !important;
  height: calc(100vh - 24px) !important;
  width: calc(100vw - 24px) !important;
  padding: 10px !important;
  background: var(--cl-bg-elevated, #0f1117) !important;
  border: 1px solid var(--cl-border-strong) !important;
  border-radius: var(--cl-radius-lg, 10px) !important;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.72) !important;
  box-sizing: border-box !important;
}

.codelab-preview-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  margin-left: 3px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 600;
  font-family: var(--cl-font-mono);
  background: var(--cl-bg-elevated);
  color: var(--cl-fg-muted);
  border: 1px solid var(--cl-border);
}

.codelab-preview-console {
  display: flex;
  flex-direction: column;
  height: 140px;
  min-height: 100px;
  max-height: 220px;
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  overflow: hidden;
  flex-shrink: 0;
}

.codelab-preview-console__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 10px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--cl-fg-muted);
  background: var(--cl-bg-elevated);
  border-bottom: 1px solid var(--cl-border);
}

.codelab-preview-console__body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 6px 10px;
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  line-height: 1.45;
}

.codelab-preview-console__empty {
  color: var(--cl-fg-faint);
  font-style: italic;
  padding: 8px 0;
}

.codelab-preview-console__row {
  display: flex;
  gap: 8px;
  padding: 2px 0;
  border-bottom: 1px solid color-mix(in srgb, var(--cl-border) 45%, transparent);
  word-break: break-word;
}

.codelab-preview-console__row--warn {
  color: var(--cl-amber, #f59e0b);
}

.codelab-preview-console__row--error {
  color: var(--cl-red, #ef4444);
}

.codelab-preview-console__time {
  color: var(--cl-fg-faint);
  flex-shrink: 0;
  font-size: 10.5px;
}

/* ── Ports, Mini HTTP Client & Network Inspector Drawer UI ──────────────── */
.codelab-ports-panel {
  display: grid;
  grid-template-columns: minmax(360px, 1.25fr) minmax(320px, 1fr);
  gap: 12px;
  padding: 10px 12px;
  height: 100%;
  box-sizing: border-box;
  overflow: auto;
  align-items: start;
}

.codelab-ports-panel > .codelab-panel-section:nth-child(3) {
  grid-column: 1 / -1;
}

@media (max-width: 860px) {
  .codelab-ports-panel {
    grid-template-columns: 1fr;
  }
}

.codelab-panel-section {
  background: var(--cl-bg-panel);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-md);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.codelab-section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--cl-fg);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--cl-border);
}

.codelab-section-title > span:first-child {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.codelab-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  font-family: var(--cl-font-mono);
  background: var(--cl-bg-elevated);
  color: var(--cl-fg-muted);
  border: 1px solid var(--cl-border);
}

.codelab-ports-empty {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 12px;
  background: var(--cl-bg);
  border: 1px dashed var(--cl-border);
  border-radius: var(--cl-radius-sm);
  color: var(--cl-fg-muted);
}

.codelab-ports-empty__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--cl-bg-elevated);
  color: var(--cl-fg-muted);
  flex-shrink: 0;
}

.codelab-ports-empty__title {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--cl-fg);
}

.codelab-ports-empty__sub {
  font-size: 11.5px;
  color: var(--cl-fg-muted);
  margin-top: 2px;
}

.codelab-ports-table-wrap,
.codelab-net-table-container {
  width: 100%;
  overflow-x: auto;
}

.codelab-ports-table,
.codelab-net-table,
.codelab-headers-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  text-align: left;
}

.codelab-ports-table th,
.codelab-net-table th {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--cl-fg-muted);
  padding: 6px 6px;
  border-bottom: 1px solid var(--cl-border);
  background: var(--cl-bg-elevated);
  white-space: nowrap;
}

.codelab-ports-table td,
.codelab-net-table td {
  padding: 6px 6px;
  border-bottom: 1px solid var(--cl-border);
  color: var(--cl-fg);
  vertical-align: middle;
}

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

.codelab-port-tag {
  display: inline-flex;
  align-items: center;
  padding: 1px 6px;
  border-radius: var(--cl-radius-sm);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  font-weight: 600;
  background: color-mix(in srgb, var(--cl-accent, #3b82f6) 15%, transparent);
  color: var(--cl-accent, #60a5fa);
}

.codelab-port-link {
  color: var(--cl-fg);
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  text-decoration: none;
}

.codelab-port-link:hover {
  text-decoration: underline;
  color: var(--cl-accent, #60a5fa);
}

.codelab-port-status {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 2px 7px;
  border-radius: 999px;
}

.codelab-port-status--listening {
  color: var(--cl-green, #22c55e);
  background: color-mix(in srgb, var(--cl-green, #22c55e) 12%, transparent);
}

.codelab-port-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* Mini HTTP Client Controls */
.codelab-http-client {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.codelab-http-url-bar {
  display: flex;
  align-items: center;
  gap: 6px;
}

.codelab-select,
.codelab-input,
.codelab-textarea {
  background: var(--cl-bg);
  color: var(--cl-fg);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm);
  font-size: 12px;
  font-family: var(--cl-font-mono);
  box-sizing: border-box;
}

.codelab-select {
  height: 30px;
  padding: 0 8px;
  cursor: pointer;
  flex-shrink: 0;
}

.codelab-input {
  height: 30px;
  padding: 0 8px;
  flex: 1 1 auto;
  min-width: 0;
}

.codelab-textarea {
  width: 100%;
  padding: 6px 8px;
  resize: vertical;
  min-height: 44px;
  line-height: 1.4;
}

.codelab-select:focus,
.codelab-input:focus,
.codelab-textarea:focus {
  outline: none;
  border-color: var(--cl-border-strong);
}

.codelab-http-editors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

@media (max-width: 640px) {
  .codelab-http-editors {
    grid-template-columns: 1fr;
  }
}

.codelab-http-editor-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.codelab-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--cl-fg-muted);
}

.codelab-subtabs {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  background: var(--cl-bg);
  padding: 2px;
  border-radius: var(--cl-radius-sm);
  border: 1px solid var(--cl-border);
}

.codelab-subtab {
  background: transparent;
  border: none;
  color: var(--cl-fg-muted);
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
}

.codelab-subtab:hover {
  color: var(--cl-fg);
}

.codelab-subtab.active {
  background: var(--cl-bg-elevated);
  color: var(--cl-fg);
  font-weight: 600;
}

.codelab-response-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-family: var(--cl-font-mono);
}

.codelab-meta-item {
  color: var(--cl-fg-muted);
}

.codelab-status-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--cl-font-mono);
  font-size: 11px;
  font-weight: 600;
}

.codelab-status-badge.status-2xx {
  color: var(--cl-green, #22c55e);
  background: color-mix(in srgb, var(--cl-green, #22c55e) 14%, transparent);
}

.codelab-status-badge.status-3xx {
  color: var(--cl-blue, #3b82f6);
  background: color-mix(in srgb, var(--cl-blue, #3b82f6) 14%, transparent);
}

.codelab-status-badge.status-4xx,
.codelab-status-badge.status-5xx {
  color: var(--cl-red, #ef4444);
  background: color-mix(in srgb, var(--cl-red, #ef4444) 14%, transparent);
}

.codelab-response-body-wrapper {
  flex: 1 1 auto;
  min-height: 110px;
  max-height: 240px;
  overflow: auto;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm);
  padding: 8px;
}

.codelab-response-placeholder {
  color: var(--cl-fg-muted);
  font-size: 12px;
  text-align: center;
  padding: 20px 12px;
}

.codelab-response-raw {
  margin: 0;
  font-family: var(--cl-font-mono);
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--cl-fg);
  white-space: pre-wrap;
  word-break: break-word;
}

.codelab-response-iframe {
  width: 100%;
  height: 180px;
  border: 0;
  background: #ffffff;
  border-radius: 4px;
}

.codelab-header-key {
  font-family: var(--cl-font-mono);
  font-weight: 600;
  color: var(--cl-fg-muted);
  width: 160px;
  padding: 3px 6px;
}

.codelab-header-val {
  font-family: var(--cl-font-mono);
  color: var(--cl-fg);
  padding: 3px 6px;
  word-break: break-all;
}

/* Network Inspector Drawer */
.codelab-network-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 8px 12px;
  gap: 8px;
  box-sizing: border-box;
  overflow: hidden;
}

.codelab-net-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.codelab-net-toolbar .codelab-input {
  max-width: 240px;
}

.codelab-net-main {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  min-height: 0;
  overflow: hidden;
}

.codelab-network-panel.has-detail .codelab-net-main {
  grid-template-columns: 1.2fr 1fr;
}

.codelab-net-table-container {
  overflow-y: auto;
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm);
  background: var(--cl-bg-panel);
}

.codelab-net-row {
  cursor: pointer;
}

.codelab-net-row:hover td {
  background: var(--cl-bg-hover);
}

.codelab-net-row.selected td {
  background: var(--cl-bg-active);
}

.codelab-method-badge {
  display: inline-block;
  font-family: var(--cl-font-mono);
  font-size: 10.5px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--cl-bg-elevated);
  color: var(--cl-fg);
}

.codelab-method-get { color: var(--cl-blue, #60a5fa); }
.codelab-method-post { color: var(--cl-green, #4ade80); }
.codelab-method-put,
.codelab-method-patch { color: var(--cl-amber, #fbbf24); }
.codelab-method-delete { color: var(--cl-red, #f87171); }

.codelab-waterfall-cell {
  width: 140px;
}

.codelab-waterfall-track {
  width: 100%;
  height: 6px;
  background: var(--cl-bg-elevated);
  border-radius: 999px;
  overflow: hidden;
}

.codelab-waterfall-bar {
  height: 100%;
  background: var(--cl-accent, #3b82f6);
  border-radius: 999px;
}

.codelab-net-detail {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--cl-border);
  border-radius: var(--cl-radius-sm);
  background: var(--cl-bg-panel);
  overflow: hidden;
  min-height: 0;
}

.codelab-net-detail__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: var(--cl-bg-elevated);
  border-bottom: 1px solid var(--cl-border);
  font-size: 12px;
}

.codelab-net-detail__body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.codelab-detail-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--cl-fg-muted);
  margin-bottom: 4px;
}

.codelab-detail-kv {
  font-size: 12px;
  color: var(--cl-fg);
  margin-bottom: 2px;
}

.codelab-detail-pre {
  margin: 0;
  padding: 6px 8px;
  background: var(--cl-bg);
  border: 1px solid var(--cl-border);
  border-radius: 4px;
  font-family: var(--cl-font-mono);
  font-size: 11px;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ── Split-Pane Web Preview: responsive behaviour ────────────────────────────
   These must come after the base `.codelab-workspace.has-preview-split` rule
   above: equal specificity, later wins. */
@media (max-width: 900px) {
  /* Device emulation and the allowlist badge are not useful in a narrow pane.
     The violation chip stays visible so blocked requests are still surfaced. */
  .codelab-preview-split .codelab-preview-modes,
  .codelab-preview-split #cl-preview-csp-badge {
    display: none;
  }

  /* Keep the split, but give the editor a floor and cap the preview share. */
  .codelab-workspace.has-preview-split {
    grid-template-columns: 155px 4px minmax(180px, 1fr) 5px minmax(200px, min(42%, var(--cl-preview-split-width, 44%)));
  }
  .codelab.files-collapsed .codelab-workspace.has-preview-split {
    grid-template-columns: 0px 0px minmax(180px, 1fr) 5px minmax(200px, min(42%, var(--cl-preview-split-width, 44%)));
  }
}

@media (max-width: 680px) {
  /* A five-column split cannot fit a phone: stack the preview under the editor
     instead of letting both shrink to nothing. The explorer and its splitter are
     hidden at this width, so only editor, splitter and preview are placed. */
  .codelab-workspace.has-preview-split {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(140px, 1fr) 5px 45%;
  }
  .codelab-preview-split {
    border-left: 0;
    border-top: 1px solid var(--cl-border);
  }
}