/* ===== Reset & Base ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Light theme (default) */
:root {
  --bg-primary: #f0f2f5;
  --bg-sidebar: #fff;
  --bg-card: #fff;
  --bg-content: #fafafa;
  --bg-input: #f5f5f5;
  --border-color: #e2e4e9;
  --border-subtle: #eef0f3;
  --text-primary: #1a1c23;
  --text-secondary: #5a5f72;
  --text-muted: #9298a8;
  --accent: #4f46e5;
  --accent-hover: #6366f1;
  --accent-subtle: rgb(79 70 229 / 8%);
  --error-bg: #fef2f2;
  --error-border: #fca5a5;
  --error-text: #991b1b;
  --error-inner-bg: #fff7ed;
  --error-inner-border: #fdba74;
  --error-inner-text: #9a3412;
  --success-bg: #f0fdf4;
  --success-border: #bbf7d0;
  --success-text: #166534;
  --trigger-bg: #fef2f2;
  --trigger-border: #fca5a5;
  --trigger-text: #991b1b;
  --fix-bg: #f0fdf4;
  --fix-border: #bbf7d0;
  --fix-text: #166534;
  --retry-bg: #eff6ff;
  --retry-border: #93c5fd;
  --retry-text: #1e40af;
}

/* Dark theme — auto via system preference */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f1117;
    --bg-sidebar: #161822;
    --bg-card: #1c1e2a;
    --bg-content: #232536;
    --bg-input: #262838;
    --border-color: #2a2d3e;
    --border-subtle: #1f2233;
    --text-primary: #e2e4e9;
    --text-secondary: #9298a8;
    --text-muted: #6b7084;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-subtle: rgb(99 102 241 / 12%);
    --error-bg: #2d1b1b;
    --error-border: #5c2626;
    --error-text: #fca5a5;
    --error-inner-bg: #2d2317;
    --error-inner-border: #5c4a26;
    --error-inner-text: #fdba74;
    --success-bg: #132719;
    --success-border: #1a4a2a;
    --success-text: #86efac;
    --trigger-bg: #2d1b1b;
    --trigger-border: #5c2626;
    --trigger-text: #fca5a5;
    --fix-bg: #132719;
    --fix-border: #1a4a2a;
    --fix-text: #86efac;
    --retry-bg: #1b2240;
    --retry-border: #2d3a6b;
    --retry-text: #93c5fd;
  }
}

/* Explicit dark override */
[data-theme='dark'] {
  --bg-primary: #0f1117;
  --bg-sidebar: #161822;
  --bg-card: #1c1e2a;
  --bg-content: #232536;
  --bg-input: #262838;
  --border-color: #2a2d3e;
  --border-subtle: #1f2233;
  --text-primary: #e2e4e9;
  --text-secondary: #9298a8;
  --text-muted: #6b7084;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-subtle: rgb(99 102 241 / 12%);
  --error-bg: #2d1b1b;
  --error-border: #5c2626;
  --error-text: #fca5a5;
  --error-inner-bg: #2d2317;
  --error-inner-border: #5c4a26;
  --error-inner-text: #fdba74;
  --success-bg: #132719;
  --success-border: #1a4a2a;
  --success-text: #86efac;
  --trigger-bg: #2d1b1b;
  --trigger-border: #5c2626;
  --trigger-text: #fca5a5;
  --fix-bg: #132719;
  --fix-border: #1a4a2a;
  --fix-text: #86efac;
  --retry-bg: #1b2240;
  --retry-border: #2d3a6b;
  --retry-text: #93c5fd;
}

/* Explicit light override */
[data-theme='light'] {
  --bg-primary: #f0f2f5;
  --bg-sidebar: #fff;
  --bg-card: #fff;
  --bg-content: #fafafa;
  --bg-input: #f5f5f5;
  --border-color: #e2e4e9;
  --border-subtle: #eef0f3;
  --text-primary: #1a1c23;
  --text-secondary: #5a5f72;
  --text-muted: #9298a8;
  --accent: #4f46e5;
  --accent-hover: #6366f1;
  --accent-subtle: rgb(79 70 229 / 8%);
  --error-bg: #fef2f2;
  --error-border: #fca5a5;
  --error-text: #991b1b;
  --error-inner-bg: #fff7ed;
  --error-inner-border: #fdba74;
  --error-inner-text: #9a3412;
  --success-bg: #f0fdf4;
  --success-border: #bbf7d0;
  --success-text: #166534;
  --trigger-bg: #fef2f2;
  --trigger-border: #fca5a5;
  --trigger-text: #991b1b;
  --fix-bg: #f0fdf4;
  --fix-border: #bbf7d0;
  --fix-text: #166534;
  --retry-bg: #eff6ff;
  --retry-border: #93c5fd;
  --retry-text: #1e40af;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  height: 100vh;
  overflow: hidden;
}

#ember-testing-container,
.ember-application {
  height: 100%;
}

/* ===== App Layout ===== */
.app-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: auto 1fr;
  height: 100vh;
  overflow: hidden;
}

/* ===== Header ===== */
.app-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.app-header .subtitle {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-left: 0.75rem;
}

.header-left {
  display: flex;
  align-items: baseline;
}

.header-title-link {
  color: inherit;
  text-decoration: none;
}

.header-title-link:hover {
  opacity: 0.8;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-link {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  transition: all 0.15s;
}

.header-link:hover {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.15s;
}

.theme-toggle:hover {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
}

/* ===== Sidebar ===== */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
}

.sidebar .theme-toggle {
  margin-top: auto;
}

.sidebar-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem 0.25rem;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: all 0.12s;
  border: 1px solid transparent;
  text-decoration: none;
  width: 100%;
  text-align: left;
  background: none;
}

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

.sidebar-item.active {
  background: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
  font-weight: 500;
}

.sidebar-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--bg-input);
  color: var(--text-muted);
  flex-shrink: 0;
}

.sidebar-item.active .sidebar-number {
  background: var(--accent);
  color: white;
}

.sidebar-item-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

/* ===== Demo Card (replaces demo-section) ===== */
.demo-section {
  max-width: 720px;
}

.demo-section h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.description {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.demo-content {
  padding: 1.25rem;
  background: var(--bg-card);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.demo-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.demo-content h4:first-child {
  margin-top: 0;
}

/* ===== Homepage ===== */
.homepage {
  max-width: 560px;
}

.homepage-banner {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  border-radius: 5px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--error-text);
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  margin-bottom: 1.25rem;
}

.homepage-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.homepage-text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.homepage-cta {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  padding: 0.6rem 1rem;
  background: var(--accent-subtle);
  border: 1px solid var(--accent);
  border-radius: 6px;
}

/* ===== Error Box ===== */
.error-box {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  color: var(--error-text);
  font-size: 0.9rem;
}

.error-box.inner {
  border-color: var(--error-inner-border);
  background: var(--error-inner-bg);
  color: var(--error-inner-text);
}

/* ===== Success ===== */
.success {
  color: var(--success-text);
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  display: block;
  font-size: 0.9rem;
}

/* ===== Buttons ===== */
button {
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.15s;
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.trigger-btn {
  background: var(--trigger-bg);
  border-color: var(--trigger-border);
  color: var(--trigger-text);
  text-decoration: none;
  display: inline-block;
}

.trigger-btn:hover:not(:disabled) {
  background: var(--trigger-border);
}

.fix-btn {
  background: var(--fix-bg);
  border-color: var(--fix-border);
  color: var(--fix-text);
}

.fix-btn:hover:not(:disabled) {
  background: var(--fix-border);
}

/* Route content spacing */
.route-content h3 {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.retry-btn {
  margin-top: 0.5rem;
  background: var(--retry-bg);
  border-color: var(--retry-border);
  color: var(--retry-text);
  text-decoration: none;
  display: inline-block;
}

.retry-btn:hover:not(:disabled) {
  background: var(--retry-border);
}

/* ===== Hint / Status ===== */
.hint {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-style: italic;
}

.hint.status-bad {
  color: var(--error-text);
  font-weight: 500;
}

.hint.status-ok {
  color: var(--success-text);
  font-weight: 500;
}

/* ===== Controls ===== */
.controls {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.controls + .success,
.controls + .error-box,
.success + .controls {
  margin-top: 0.5rem;
}

.controls-spaced {
  margin-top: 0.5rem;
}

.sibling-after {
  margin-top: 1rem;
}

/* ===== Counter ===== */
.counter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.success + .counter {
  margin-top: 0.75rem;
}

/* ===== Nested Boundaries ===== */
.nested-level {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-top: 0.5rem;
}

/* ===== Siblings ===== */
.siblings {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.sibling h3 {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

/* ===== Route Content ===== */
.route-content {
  max-width: 720px;
}

.route-content .success {
  margin-bottom: 0.75rem;
}

/* ===== Layout Component (Scenario 11) ===== */
.layout-wrapper {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.layout-header {
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===== In-Element Layout (Scenario 13) ===== */
.in-element-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.in-element-source,
.in-element-target {
  position: relative;
  padding: 1rem;
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  min-height: 80px;
}

.in-element-target {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.in-element-section + .in-element-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.in-element-target .existing-content {
  display: block;
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 600;
  margin-top: 0.5rem;
  padding: 0.6rem 0.8rem;
  background: var(--bg-content);
  border: 2px solid var(--border-color);
  border-radius: 6px;
}

h4.sub {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.in-element-layout .label {
  position: absolute;
  top: -0.6rem;
  left: 0.75rem;
  background: var(--bg-card);
  padding: 0 0.35rem;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (width <= 768px) {
  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    overflow: auto hidden;
    padding: 0.25rem 0.5rem;
    gap: 0.25rem;
  }

  .sidebar-label {
    display: none;
  }

  .sidebar-item {
    white-space: nowrap;
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
  }

  .content-area {
    padding: 1rem;
  }
}

/* ===== Scrollbar styling ===== */
.sidebar::-webkit-scrollbar,
.content-area::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-track,
.content-area::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb,
.content-area::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover,
.content-area::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== Source Viewer ===== */
.source-viewer {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  max-width: 720px;
}

.source-viewer-heading {
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.code-block {
  background: var(--bg-content);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.6;
}

.code-block code {
  font-family:
    'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', monospace;
  background: none;
}

/* Override highlight.js theme backgrounds */
.code-block code.hljs {
  background: transparent;
  padding: 0;
}

.source-viewer-details {
  margin-top: 0.75rem;
}

.source-viewer-details summary {
  cursor: pointer;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  user-select: none;
  padding: 0.35rem 0;
}

.source-viewer-details summary:hover {
  color: var(--accent-hover);
}

.source-viewer-details[open] summary {
  margin-bottom: 0.5rem;
}

.source-viewer-github-link {
  display: inline-block;
  margin-top: 0.75rem;
  color: var(--accent);
  font-size: 0.82rem;
  text-decoration: none;
  font-weight: 500;
}

.source-viewer-github-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}