/* ============================================================================
   Clipper2 Demo — Light Professional Theme
   ============================================================================ */

:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-alt: #f0f2f5;
  --border: #e2e5ea;
  --border-light: #eef0f3;
  --text: #1a1d23;
  --text-secondary: #5a6170;
  --text-muted: #8b92a0;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff4ff;
  --subject-fill: rgba(0, 180, 140, 0.15);
  --subject-stroke: #00b48c;
  --clip-fill: rgba(235, 68, 68, 0.15);
  --clip-stroke: #eb4444;
  --solution-fill: rgba(37, 99, 235, 0.20);
  --solution-stroke: #2563eb;
  --sidebar-width: 240px;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --transition: 150ms ease;
}

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

html {
  overflow-x: hidden;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  max-width: 100vw;
  overflow-x: hidden;
}

/* ============================================================================
   Sidebar
   ============================================================================ */

#sidebar {
  width: var(--sidebar-width);
  min-height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid var(--border-light);
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

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

.tagline {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-list {
  list-style: none;
  padding: 8px 8px;
  flex: 1;
}

.nav-section {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  padding: 16px 12px 6px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition);
}

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

.nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
}

.nav-icon {
  font-size: 14px;
  width: 18px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-light);
  font-size: 11px;
  color: var(--text-muted);
}

.sidebar-footer a {
  color: var(--accent);
  text-decoration: none;
}

.sidebar-footer .license {
  margin-top: 4px;
  font-size: 10px;
}

.sidebar-footer .build-info {
  margin-top: 8px;
  font-family: var(--font-mono, monospace);
  font-size: 10px;
  color: var(--text-muted);
}

.sidebar-footer .build-info a {
  color: var(--text-muted);
  text-decoration: underline;
}

.sidebar-footer .build-info a:hover {
  color: var(--accent);
}

/* ============================================================================
   Main Content
   ============================================================================ */

#main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  min-width: 0;
  overflow-x: hidden;
}

/* ============================================================================
   Home / Landing Page
   ============================================================================ */

.home-page {
  padding: 48px 40px;
  max-width: 1100px;
}

.github-badge {
  margin-bottom: 24px;
}

.github-badge-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: #24292f;
  color: #ffffff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition);
  font-family: var(--font);
}

.github-badge-link:hover {
  background: #1b1f23;
}

.github-badge-link svg {
  flex-shrink: 0;
}

.hero {
  margin-bottom: 48px;
}

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -1px;
  line-height: 1.1;
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-top: 12px;
  line-height: 1.6;
  max-width: 600px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}

.feature-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.feature-card .card-icon {
  font-size: 24px;
  margin-bottom: 12px;
  display: block;
}

.feature-card h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.about-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.about-section h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.about-section p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 700px;
}

.about-section a {
  color: var(--accent);
  text-decoration: none;
}

.about-section a:hover {
  text-decoration: underline;
}

.stats-row {
  display: flex;
  gap: 32px;
  margin-top: 20px;
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 2px;
}

/* Port progress badges */
.badge-live {
  font-size: 0.7rem;
  font-weight: 700;
  color: #15803d;
  border: 1px solid #15803d;
  border-radius: 10px;
  padding: 1px 8px;
  vertical-align: middle;
  letter-spacing: 0.4px;
}

.badge-planned {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1px 8px;
  vertical-align: middle;
  letter-spacing: 0.4px;
}

.wasm-note {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
  font-family: var(--font-mono);
}

.feature-card .card-badge {
  float: right;
  margin-top: 2px;
}

/* ============================================================================
   Demo Page Layout
   ============================================================================ */

.demo-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 100%;
  overflow-x: hidden;
  overflow-y: hidden;
}

.demo-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  min-width: 0;
  overflow: hidden;
}

.demo-header h2 {
  font-size: 18px;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.demo-header p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.demo-body {
  display: flex;
  flex: 1;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
}

.demo-canvas-area {
  flex: 1;
  position: relative;
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  overflow: hidden;
}

.demo-canvas-area canvas {
  display: block;
  width: 100%;
  height: 100%;
  /* Own touch gestures on the canvas (orbit/pinch/pan) — the page UI outside the
     canvas keeps native scrolling. Canvas only, per the touch handlers in
     render/camera-controls.ts. */
  touch-action: none;
}

/* --- Fallback sample-nav header (main.ts ensureSampleNav) ------------------ */
/* Injected at the top of the Info panel on sample pages that don't use the
   shared attachInteraction header. Generic (theme-var) styling for non-shell
   pages; the `.demo-page.samples-shell .sample-nav-btn / .sample-csource` rules
   below have higher specificity and take over inside the dark samples shell. */
.sample-nav-header {
  margin-bottom: 12px;
}

.sample-nav-header .sample-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sample-nav-header .sample-name {
  flex: 1;
  min-width: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.sample-nav-header .sample-nav-btn {
  flex: none;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 11px;
  line-height: 1;
  color: var(--text-secondary);
  background: var(--surface-alt, #f0f0f0);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}

.sample-nav-header .sample-nav-btn:hover:not(:disabled) {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.sample-nav-header .sample-nav-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.sample-nav-header .sample-csource {
  display: inline-block;
  margin-top: 4px;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  word-break: break-all;
}

.sample-nav-header .sample-csource:hover {
  text-decoration: underline;
}

.demo-controls {
  width: 280px;
  min-width: 280px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
}

/* ============================================================================
   Controls
   ============================================================================ */

.control-group {
  margin-bottom: 16px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.control-group select,
.control-group input[type="range"] {
  width: 100%;
}

.control-group select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  outline: none;
  font-family: var(--font);
}

.control-group select:focus {
  border-color: var(--accent);
}

.control-group input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--surface);
  box-shadow: var(--shadow);
}

.slider-value {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  text-transform: none;
  letter-spacing: 0;
}

.control-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.control-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}

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

.control-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.control-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.control-checkbox input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.control-separator {
  height: 1px;
  background: var(--border-light);
  margin: 16px 0;
}

.info-box {
  background: var(--accent-light);
  border: 1px solid #d0dcf5;
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 12px;
  color: var(--accent);
  line-height: 1.5;
  margin-bottom: 16px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.info-readout {
  background: var(--surface-alt);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

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

.info-readout .value {
  color: var(--text);
  font-weight: 600;
}

/* ============================================================================
   Source Code Panel
   ============================================================================ */

.code-panel {
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.code-panel-collapsible {
  max-height: 0;
  overflow: hidden;
  transition: max-height 300ms ease;
}

.code-panel-collapsible.open {
  max-height: 400px;
}

.code-panel-toggle {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 6px 24px;
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition);
  z-index: 10;
}

.code-panel-toggle:hover {
  color: var(--accent);
  background: var(--accent-light);
}

/* Mobile toggle lives inside .code-panel — hidden on desktop */
.code-panel-toggle-mobile {
  display: none;
  position: static;
  border-top: none;
  border-bottom: 1px solid var(--border);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border-light);
}

.code-tabs {
  display: flex;
  gap: 4px;
}

.code-tab {
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  background: none;
  border: none;
  font-family: var(--font);
}

.code-tab.active {
  background: var(--accent-light);
  color: var(--accent);
}

.copy-btn {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 11px;
  cursor: pointer;
  color: var(--text-muted);
  font-family: var(--font);
}

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

.code-content {
  padding: 16px 24px;
  overflow: auto;
  max-height: 340px;
}

.code-content pre {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text);
  white-space: pre;
  tab-size: 4;
}

/* Syntax highlighting */
.code-content .kw { color: #7c3aed; font-weight: 600; }
.code-content .ty { color: #0369a1; }
.code-content .fn { color: #c2410c; }
.code-content .str { color: #15803d; }
.code-content .num { color: #b45309; }
.code-content .cmt { color: #9ca3af; font-style: italic; }
.code-content .mac { color: #7c3aed; }

/* ============================================================================
   Canvas Overlay Info
   ============================================================================ */

.canvas-info {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  pointer-events: none;
  box-shadow: var(--shadow);
}

.stats-overlay {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  pointer-events: none;
  box-shadow: var(--shadow);
  z-index: 2;
}

.control-section-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin: 8px 0 10px;
}

.param-panel {
  margin-bottom: 8px;
}

.canvas-hint {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  font-size: 11px;
  color: var(--text-muted);
  pointer-events: none;
  white-space: nowrap;
  box-shadow: var(--shadow);
  max-width: calc(100% - 24px);
  text-align: center;
}

.hint-mobile { display: none; }

@media (pointer: coarse) {
  .hint-desktop { display: none; }
  .hint-mobile { display: inline; }
}

/* ============================================================================
   Fill rules 2x2 grid
   ============================================================================ */

.fill-rules-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  flex: 1;
  min-height: 0;
  gap: 1px;
  background: var(--border);
}

.fill-rule-cell {
  background: var(--surface);
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.fill-rule-cell .cell-label {
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-light);
}

.fill-rule-cell canvas {
  flex: 1;
  width: 100%;
  height: 100%;
  display: block;
}

/* ============================================================================
   Simplify side-by-side
   ============================================================================ */

.simplify-split {
  display: flex;
  flex: 1;
}

.simplify-panel {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
}

.simplify-panel + .simplify-panel {
  border-left: 1px solid var(--border);
}

.panel-header {
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
}

.panel-header .count {
  font-weight: 400;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ============================================================================
   PolyTree tree view
   ============================================================================ */

.polytree-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.tree-panel {
  width: 280px;
  min-width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px;
}

.tree-node {
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background var(--transition);
}

.tree-node:hover {
  background: var(--surface-alt);
}

.tree-node.selected {
  background: var(--accent-light);
  color: var(--accent);
}

.tree-node .depth-indent {
  display: inline-block;
}

.tree-node .node-icon {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  margin-right: 6px;
  vertical-align: middle;
}

/* ============================================================================
   Scrollbar
   ============================================================================ */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================================================
   Hamburger Menu Button
   ============================================================================ */

.menu-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  padding: 8px 7px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  box-shadow: var(--shadow);
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: all 200ms ease;
}

.menu-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Sidebar overlay (mobile only) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 90;
  opacity: 0;
  transition: opacity 200ms ease;
}

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

/* ============================================================================
   Responsive — Tablet (≤ 900px)
   ============================================================================ */

@media (max-width: 900px) {
  .demo-body {
    flex-direction: column;
  }

  .demo-controls {
    width: 100%;
    min-width: 0;
    border-left: none;
    border-top: 1px solid var(--border);
    max-height: 240px;
    overflow-y: auto;
  }

  .demo-canvas-area {
    min-height: 300px;
  }

  /* Fill rules: 2x2 → 1x4 */
  .fill-rules-grid {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(4, 1fr);
  }

  .fill-rule-cell {
    min-height: 200px;
  }

  /* Simplify: side-by-side → stacked */
  .simplify-split {
    flex-direction: column;
  }

  .simplify-panel + .simplify-panel {
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .simplify-panel {
    min-height: 200px;
  }

  /* PolyTree: side-by-side → stacked */
  .polytree-layout {
    flex-direction: column;
  }

  .tree-panel {
    width: 100%;
    min-width: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 200px;
  }
}

/* ============================================================================
   Responsive — Mobile (≤ 768px)
   ============================================================================ */

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .sidebar-overlay {
    display: block;
    pointer-events: none;
  }

  .sidebar-overlay.visible {
    pointer-events: auto;
  }

  #sidebar {
    transform: translateX(-100%);
    transition: transform 250ms ease;
    box-shadow: none;
  }

  #sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-md);
  }

  #main-content {
    margin-left: 0;
  }

  /* Home page adjustments */
  .home-page {
    padding: 60px 20px 32px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero p {
    font-size: 14px;
  }

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

  .stats-row {
    flex-wrap: wrap;
    gap: 16px;
  }

  .stat-value {
    font-size: 22px;
  }

  /* Demo page header gets padding for hamburger */
  .demo-header {
    padding-left: 60px;
  }

  /* Keep demo-page viewport-locked (like desktop) so header never scrolls away.
     Move scrolling to demo-body instead. */
  .demo-page {
    height: 100vh;
    overflow: hidden;
  }

  .demo-body {
    overflow-y: auto;
  }

  .demo-canvas-area {
    min-height: 250px;
    flex: none;
    height: 50vh;
  }

  .demo-controls {
    flex-shrink: 0;
  }

  /* Code panel: hide desktop toggle, show mobile toggle inside panel */
  .code-panel-toggle:not(.code-panel-toggle-mobile) {
    display: none;
  }

  .code-panel-toggle-mobile {
    display: block;
  }

  .code-panel-collapsible.open {
    max-height: 440px;
  }

  /* Touch-friendly controls */
  .control-group select {
    padding: 10px 12px;
    font-size: 14px;
  }

  .control-group input[type="range"] {
    height: 8px;
  }

  .control-group input[type="range"]::-webkit-slider-thumb {
    width: 22px;
    height: 22px;
  }

  .control-btn {
    padding: 10px 16px;
    font-size: 13px;
  }

  .control-checkbox {
    font-size: 14px;
    padding: 4px 0;
  }

  .control-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
  }

  /* Canvas overlays */
  .canvas-info {
    top: auto;
    bottom: 44px;
    left: 8px;
    font-size: 10px;
  }

  .canvas-hint {
    font-size: 10px;
    top: 8px;
  }

  /* Fill rules: keep compact 2x2 grid on mobile */
  .fill-rules-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    flex: none;
    height: 50vh;
    min-height: 200px;
  }

  .fill-rule-cell {
    min-height: 0;
  }

  .fill-rule-cell .cell-label {
    padding: 4px 8px;
    font-size: 10px;
  }

  /* Simplify: constrain stacked panels */
  .simplify-split {
    flex: none;
    height: 50vh;
    min-height: 200px;
  }

  .simplify-panel {
    min-height: 0;
  }

  .simplify-panel .panel-header {
    padding: 4px 8px;
    font-size: 11px;
  }
}

/* ============================================================================
   Samples App shell — dark right Info panel (C DrawInfoPanel)
   ============================================================================ */

.demo-page.samples-shell {
  --samples-panel-bg: #1e2228;
  --samples-panel-alt: #262b33;
  --samples-border: #343b46;
  --samples-text: #e6e8ec;
  --samples-muted: #9aa3b2;
  --samples-goldenrod: #daa520;
  --samples-seagreen: #2e8b57;
  --samples-paused: #e05555;
  --samples-accent: #4a90d9;
}

.demo-page.samples-shell .demo-canvas-area {
  background: #5c6778;
}

/* Bottom Diagnostics drawer (C Sample::DrawMetrics / M). */
.demo-page.samples-shell .sample-metrics {
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 8px;
  z-index: 40;
  max-width: min(520px, calc(100% - 16px));
  padding: 8px 10px;
  border-radius: 4px;
  background: rgba(26, 27, 29, 0.92);
  border: 1px solid #343b46;
  color: #e5e8ed;
  font-family: var(--font);
  font-size: 12px;
  pointer-events: none;
}

.demo-page.samples-shell .sample-metrics-head {
  font-weight: 600;
  color: #6199cc;
  margin-bottom: 6px;
}

.demo-page.samples-shell .sample-metrics-hint {
  font-weight: 400;
  color: #8b93a1;
  margin-left: 4px;
}

.demo-page.samples-shell .sample-metrics-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 16px;
}

.demo-page.samples-shell .sample-metrics-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: #c5cad3;
}

.demo-page.samples-shell .sample-metrics-row span:last-child {
  color: #9ad27a;
  font-variant-numeric: tabular-nums;
}

.demo-page.samples-shell .sample-draw-text {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 3;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.45;
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
  white-space: nowrap;
}

.demo-page.samples-shell .canvas-hint:empty {
  display: none;
}
.demo-page.samples-shell .canvas-hint {
  background: rgba(30, 34, 40, 0.82);
  border-color: var(--samples-border);
  color: var(--samples-muted);
  box-shadow: none;
}

.demo-page.samples-shell .demo-controls,
.demo-page.samples-shell .demo-controls.samples-info-panel {
  width: 300px;
  min-width: 300px;
  background: var(--samples-panel-bg);
  border-left: 1px solid var(--samples-border);
  color: var(--samples-text);
  padding: 14px 14px 24px;
}

.demo-page.samples-shell .samples-info-head {
  margin-bottom: 4px;
}

.demo-page.samples-shell .sample-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.demo-page.samples-shell .sample-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--samples-goldenrod);
  letter-spacing: -0.2px;
  line-height: 1.3;
  flex: 1;
  min-width: 0;
}

/* ◀ / ▶ prev-next controls next to the sample name — same C-sorted order as the
   [ / ] keys and the Sim menu. */
.demo-page.samples-shell .sample-nav-btn {
  flex: none;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 11px;
  line-height: 1;
  color: var(--samples-text);
  background: var(--samples-frame-bg, #2e3036);
  border: 1px solid var(--samples-border);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}

.demo-page.samples-shell .sample-nav-btn:hover:not(:disabled) {
  background: var(--samples-accent, #477aa8);
  border-color: var(--samples-accent, #477aa8);
  color: #fff;
}

.demo-page.samples-shell .sample-nav-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.demo-page.samples-shell .sample-category {
  font-size: 12px;
  color: #d3d3d3;
  margin-top: 2px;
  margin-bottom: 4px;
}

/* Link to the exact upstream C sample file at the pinned submodule commit. */
.demo-page.samples-shell .sample-csource {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--samples-seagreen);
  text-decoration: none;
  margin-bottom: 6px;
  word-break: break-all;
}

.demo-page.samples-shell .sample-csource:hover {
  text-decoration: underline;
}

.demo-page.samples-shell .sample-paused {
  color: var(--samples-paused);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.4px;
  margin-bottom: 6px;
}

.demo-page.samples-shell .sample-paused-hint {
  color: var(--samples-muted);
  font-weight: 500;
  font-size: 11px;
}

.demo-page.samples-shell .sample-sep {
  height: 1px;
  background: var(--samples-border);
  margin: 8px 0;
}

.demo-page.samples-shell .sample-stat {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--samples-seagreen);
  line-height: 1.55;
}

.demo-page.samples-shell .control-section-title,
.demo-page.samples-shell .collapse-header {
  color: var(--samples-muted);
}

.demo-page.samples-shell .collapse-section {
  margin: 10px 0 4px;
  border-top: 1px solid var(--samples-border);
  padding-top: 6px;
}

.demo-page.samples-shell .collapse-header {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  background: transparent;
  border: none;
  padding: 4px 0;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  cursor: pointer;
  color: var(--samples-muted);
  font-family: var(--font);
}

.demo-page.samples-shell .collapse-header:hover {
  color: var(--samples-text);
}

.demo-page.samples-shell .collapse-chevron {
  display: inline-block;
  transition: transform 120ms ease;
  font-size: 10px;
}

.demo-page.samples-shell .collapse-section:not(.open) .collapse-chevron {
  transform: rotate(-90deg);
}

.demo-page.samples-shell .collapse-section:not(.open) .collapse-body {
  display: none;
}

.demo-page.samples-shell .collapse-body {
  padding: 6px 0 4px;
}

.demo-page.samples-shell .control-group label {
  color: var(--samples-muted);
}

.demo-page.samples-shell .slider-value {
  color: var(--samples-accent);
}

.demo-page.samples-shell .control-group input[type="range"] {
  background: #3a424e;
}

.demo-page.samples-shell .control-group input[type="range"]::-webkit-slider-thumb {
  background: var(--samples-accent);
  border-color: var(--samples-panel-bg);
}

.demo-page.samples-shell .control-btn {
  background: var(--samples-panel-alt);
  border-color: var(--samples-border);
  color: var(--samples-text);
}

.demo-page.samples-shell .control-btn:hover:not(:disabled) {
  border-color: var(--samples-accent);
  color: var(--samples-accent);
}

.demo-page.samples-shell .control-btn.active {
  background: var(--samples-accent);
  border-color: var(--samples-accent);
  color: #fff;
}

.demo-page.samples-shell .control-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.demo-page.samples-shell .control-btn-block {
  width: 100%;
  margin-top: 8px;
}

.demo-page.samples-shell .control-checkbox {
  color: var(--samples-text);
}

.demo-page.samples-shell .control-checkbox input {
  accent-color: var(--samples-accent);
}

.demo-page.samples-shell .control-text {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--samples-border);
  border-radius: var(--radius-sm);
  background: var(--samples-panel-alt);
  color: var(--samples-text);
  font-size: 12px;
  font-family: var(--font-mono);
  outline: none;
}

.demo-page.samples-shell .control-text:focus {
  border-color: var(--samples-accent);
}

.demo-page.samples-shell .control-note {
  font-size: 11px;
  color: var(--samples-muted);
  margin: 4px 0 10px;
  line-height: 1.4;
}

.demo-page.samples-shell .info-box {
  background: rgba(74, 144, 217, 0.12);
  border-color: rgba(74, 144, 217, 0.28);
  color: #9ec1e8;
}

.demo-page.samples-shell .info-readout {
  background: var(--samples-panel-alt);
  border-color: var(--samples-border);
  color: var(--samples-muted);
}

.demo-page.samples-shell .info-readout .value {
  color: var(--samples-text);
}

.demo-page.samples-shell .key-legend {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
  color: var(--samples-muted);
}

.demo-page.samples-shell .key-legend td {
  padding: 3px 0;
  vertical-align: top;
}

.demo-page.samples-shell .key-legend td:first-child {
  color: var(--samples-text);
  font-family: var(--font-mono);
  white-space: nowrap;
  padding-right: 10px;
  width: 42%;
}

.demo-page.samples-shell .samples-transport {
  margin-bottom: 10px;
}

.demo-page.samples-shell .stats-overlay {
  display: none;
}

.demo-page.samples-shell input[type="range"]:disabled {
  opacity: 0.45;
}

@media (max-width: 768px) {
  .demo-page.samples-shell .demo-controls,
  .demo-page.samples-shell .demo-controls.samples-info-panel {
    width: 100%;
    min-width: 0;
    max-height: 42vh;
    border-left: none;
    border-top: 1px solid var(--samples-border);
  }
}