/* ═══════════════════════════════════════════════════════════════
   Arduino Simulator — Professional IDE Layout
   Inspired by Velxio, adapted to our design system
   ═══════════════════════════════════════════════════════════════ */

/* ── Lupine design tokens (Morphous) ── */
[data-theme="light"] {
  --background: oklch(0.986 0.003 286.4);
  --foreground: oklch(0.208 0.040 265.8);
  --card: oklch(0.973 0.007 124.4);
  --card-foreground: oklch(0.208 0.040 265.8);
  --primary: oklch(0.457 0.215 277.0);
  --primary-foreground: oklch(0.986 0.003 286.4);
  --secondary: oklch(0.978 0.003 128.5);
  --secondary-foreground: oklch(0.181 0.033 256.7);
  --muted: oklch(0.977 0.004 134.8);
  --muted-foreground: oklch(0.181 0.033 256.7);
  --accent: oklch(0.585 0.204 277.1);
  --accent-foreground: oklch(0.208 0.040 265.8);
  --border: oklch(0.968 0.004 286.3);
  --input: oklch(0.968 0.004 286.3);
  --ring: oklch(0.627 0.170 149.2);
  --radius: 0.5rem;
  --ard-bg: var(--background);
  --ard-panel: var(--card);
  --ard-panel-deep: var(--secondary);
  --ard-border: var(--border);
  --ard-text: var(--foreground);
  --ard-muted: var(--muted-foreground);
  --ard-accent: var(--primary);
  --ard-accent-secondary: var(--accent);
  --ard-editor-bg: oklch(0.995 0.002 286.4);
  --ard-serial-bg: var(--muted);
  --ard-serial-text: oklch(0.35 0.12 150);
  --ard-tab-active: var(--card);
  --ard-tab-inactive: var(--secondary);
  --ard-success: oklch(0.627 0.170 149.2);
  --ard-error: oklch(0.55 0.22 25);
  --ard-warning: oklch(0.72 0.14 85);
  --ard-accent-soft: color-mix(in oklch, var(--ard-accent) 12%, transparent);
  --ard-accent-strong: color-mix(in oklch, var(--ard-accent) 22%, transparent);
  --ard-ring: var(--ring);
}
[data-theme="dark"] {
  --background: oklch(0.208 0.040 265.8);
  --foreground: oklch(0.986 0.003 286.4);
  --card: oklch(0.190 0.034 258.3);
  --card-foreground: oklch(0.986 0.003 286.4);
  --primary: oklch(0.627 0.170 149.2);
  --primary-foreground: oklch(0.208 0.040 265.8);
  --secondary: oklch(0.382 0.026 264.2);
  --secondary-foreground: oklch(0.986 0.003 286.4);
  --muted: oklch(0.382 0.026 264.2);
  --muted-foreground: oklch(0.976 0.009 292.8);
  --accent: oklch(0.585 0.204 277.1);
  --accent-foreground: oklch(0.208 0.040 265.8);
  --border: oklch(1 0 0 / 12%);
  --input: oklch(1 0 0 / 16%);
  --ring: oklch(0.627 0.170 149.2);
  --radius: 0.5rem;
  --ard-bg: var(--background);
  --ard-panel: var(--card);
  --ard-panel-deep: oklch(0.175 0.036 260);
  --ard-border: var(--border);
  --ard-text: var(--foreground);
  --ard-muted: var(--muted-foreground);
  --ard-accent: var(--primary);
  --ard-accent-secondary: var(--accent);
  --ard-editor-bg: oklch(0.165 0.032 258);
  --ard-serial-bg: oklch(0.145 0.028 258);
  --ard-serial-text: var(--primary);
  --ard-tab-active: var(--ard-editor-bg);
  --ard-tab-inactive: var(--secondary);
  --ard-success: var(--primary);
  --ard-error: oklch(0.704 0.191 22.2);
  --ard-warning: oklch(0.82 0.12 85);
  --ard-accent-soft: color-mix(in oklch, var(--ard-accent) 14%, transparent);
  --ard-accent-strong: color-mix(in oklch, var(--ard-accent) 24%, transparent);
  --ard-ring: var(--ring);
}

/* ── Reset ── */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--ard-bg);
  color: var(--ard-text);
  font-family: 'DM Sans', sans-serif;
  margin: 0;
  overflow: hidden;
}

/* ── App Shell ── */
.ard-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding-top: var(--header-height-desktop, 72px);
}

/* ── Hero Bar (H1 + ad) ── */
.ard-hero-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  flex-shrink: 0;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 6px 12px;
  border-bottom: 1px solid var(--ard-border);
  background: var(--ard-panel-deep);
}
.ard-hero-h1 {
  font: 600 15px/1.3 'Sora', sans-serif;
  color: var(--ard-text);
  margin: 0;
  white-space: nowrap;
}
.ad-ard-hero {
  text-align: center;
  max-width: 728px;
  flex: 1;
  min-width: 300px;
  min-height: 50px;
  flex-shrink: 0;
}

/* ── Mobile Tab Bar ── */
.ard-mobile-tabs {
  display: none;
  flex-shrink: 0;
  height: 40px;
  background: var(--ard-panel);
  border-bottom: 1px solid var(--ard-border);
}
.ard-mtab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  background: transparent;
  color: var(--ard-muted);
  font: 500 12px 'DM Sans', sans-serif;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all .15s;
}
.ard-mtab.active {
  color: var(--ard-accent);
  border-bottom-color: var(--ard-accent);
  background: var(--ard-accent-soft);
}
.ard-mtab svg { width: 14px; height: 14px; }

/* ── Main Split ── */
.ard-main {
  flex: 1;
  display: flex;
  flex-direction: row;
  overflow: hidden;
  min-height: 0;
}

/* ── LEFT: Editor Side ── */
.ard-editor-side {
  width: 45%;
  min-width: 250px;
  display: flex;
  flex-direction: row;
  overflow: hidden;
}

/* File Explorer Sidebar */
.ard-file-explorer {
  width: 180px;
  flex-shrink: 0;
  background: var(--ard-panel);
  border-right: 1px solid var(--ard-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.ard-fe-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  font: 600 10px 'Sora', sans-serif;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ard-muted);
  border-bottom: 1px solid var(--ard-border);
}
.ard-fe-new {
  width: 22px; height: 22px; border: 1px solid var(--ard-border); border-radius: 4px;
  background: transparent; color: var(--ard-accent); font: 600 14px sans-serif;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.ard-fe-new:hover { background: var(--ard-accent-soft); }
.ard-fe-list { flex: 1; overflow-y: auto; padding: 4px 0; }
.ard-fe-file {
  display: flex; align-items: center; gap: 6px; padding: 5px 10px;
  cursor: pointer; font: 12px 'DM Sans', sans-serif; color: var(--ard-muted);
  transition: background .1s; position: relative;
}
.ard-fe-file:hover { background: rgba(255,255,255,.04); }
.ard-fe-file.active { background: var(--ard-accent-soft); color: var(--ard-text); }
.ard-fe-icon {
  width: 16px; text-align: center; font: 600 10px 'Fira Code', monospace;
  color: var(--ard-accent); flex-shrink: 0;
}
.ard-fe-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ard-fe-modified {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ard-warning); flex-shrink: 0;
}
.ard-fe-delete {
  opacity: 0; border: none; background: none; color: var(--ard-muted);
  font-size: 14px; cursor: pointer; padding: 0 2px;
}
.ard-fe-file:hover .ard-fe-delete { opacity: 1; }
.ard-fe-delete:hover { color: var(--ard-error); }

/* Explorer resize handle */
.ard-fe-resize {
  width: 4px; flex-shrink: 0; cursor: col-resize;
  background: var(--ard-border); transition: background .15s;
}
.ard-fe-resize:hover { background: var(--ard-accent); }

/* Editor Toolbar (36px) */
.ard-editor-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 8px;
  height: 36px;
  background: var(--ard-panel);
  border-bottom: 1px solid var(--ard-border);
  flex-shrink: 0;
  user-select: none;
}
.ard-tb-btn {
  padding: 4px 10px;
  border: 1px solid var(--ard-border);
  border-radius: 4px;
  background: transparent;
  color: var(--ard-text);
  font: 600 11px 'DM Sans', sans-serif;
  cursor: pointer;
  transition: background .12s;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 4px;
}
.ard-tb-btn:hover { background: rgba(255,255,255,.06); }
.ard-tb-run {
  background: rgba(34,197,94,.12);
  border-color: var(--ard-success);
  color: var(--ard-success);
}
.ard-tb-run:hover { background: rgba(34,197,94,.22); }
.ard-tb-run.running {
  background: rgba(239,68,68,.12);
  border-color: var(--ard-error);
  color: var(--ard-error);
}
.ard-tb-run.running:hover { background: rgba(239,68,68,.22); }
.ard-tb-stop { color: var(--ard-error); border-color: rgba(239,68,68,.3); }
.ard-tb-compile {
  background: var(--ard-accent-soft);
  border-color: color-mix(in oklch, var(--ard-accent) 40%, transparent);
  color: var(--ard-accent);
}
.ard-tb-compile:hover { background: var(--ard-accent-strong); }
.ard-tb-compile.compiling { pointer-events: none; opacity: .7; }
.ard-tb-compile.compiling .ard-tb-icon { display: none; }
.ard-tb-compile.compiling .ard-spinner { display: block; }
.ard-tb-compile .ard-spinner { display: none; }

/* Toolbar icons */
.ard-tb-icon { width: 14px; height: 14px; flex-shrink: 0; }

/* Spinner animation */
.ard-spinner { width: 14px; height: 14px; animation: ard-spin .8s linear infinite; }
@keyframes ard-spin { to { transform: rotate(360deg); } }

/* Disabled buttons */
.ard-tb-btn:disabled { opacity: .35; cursor: not-allowed; pointer-events: none; }
.ard-tb-toggle.active {
  background: var(--ard-accent-soft);
  border-color: color-mix(in oklch, var(--ard-accent) 40%, transparent);
  color: var(--ard-accent);
}
.ard-tb-sep {
  width: 1px;
  height: 18px;
  background: var(--ard-border);
  flex-shrink: 0;
}
.ard-compile-status {
  margin-left: auto;
  font: 11px 'Fira Code', monospace;
  color: var(--ard-muted);
  white-space: nowrap;
}
.ard-compile-status.success { color: var(--ard-success); }
.ard-compile-status.error { color: var(--ard-error); }
.ard-compile-status.compiling { color: var(--ard-accent); }

.ard-examples-select {
  padding: 3px 6px;
  border: 1px solid var(--ard-border);
  border-radius: 4px;
  background: var(--ard-panel);
  color: var(--ard-text);
  font: 11px 'DM Sans', sans-serif;
  cursor: pointer;
  outline: none;
}
.ard-examples-select:focus { border-color: var(--ard-accent); }

/* Light theme contrast tuning for top controls:
   compile/run/examples/AI/output/board/component/share/diagram/theme */
[data-theme="light"] .ard-tb-btn {
  background: oklch(0.995 0.002 286.4);
  border-color: oklch(0.82 0.01 255);
  color: oklch(0.22 0.03 258);
}
[data-theme="light"] .ard-tb-btn:hover:not(:disabled) {
  background: oklch(0.965 0.008 260);
  border-color: oklch(0.74 0.018 252);
  color: oklch(0.18 0.03 256);
}
[data-theme="light"] .ard-tb-toggle.active {
  background: color-mix(in oklch, var(--ard-accent) 14%, white);
  border-color: color-mix(in oklch, var(--ard-accent) 46%, oklch(0.82 0.01 255));
  color: color-mix(in oklch, var(--ard-accent) 80%, black);
}
[data-theme="light"] .ard-tb-compile {
  background: color-mix(in oklch, var(--ard-accent) 14%, white);
  border-color: color-mix(in oklch, var(--ard-accent) 46%, oklch(0.82 0.01 255));
  color: color-mix(in oklch, var(--ard-accent) 82%, black);
}
[data-theme="light"] .ard-tb-run {
  background: color-mix(in oklch, var(--ard-success) 14%, white);
  border-color: color-mix(in oklch, var(--ard-success) 52%, oklch(0.82 0.01 255));
  color: color-mix(in oklch, var(--ard-success) 88%, black);
}
[data-theme="light"] .ard-tb-run:hover:not(:disabled) {
  background: color-mix(in oklch, var(--ard-success) 24%, white);
}
[data-theme="light"] .ard-tb-stop {
  background: color-mix(in oklch, var(--ard-error) 10%, white);
  border-color: color-mix(in oklch, var(--ard-error) 45%, oklch(0.82 0.01 255));
  color: color-mix(in oklch, var(--ard-error) 84%, black);
}
[data-theme="light"] .ard-tb-ai {
  background: color-mix(in oklch, var(--ard-accent-secondary) 14%, white) !important;
  border-color: color-mix(in oklch, var(--ard-accent-secondary) 50%, oklch(0.82 0.01 255)) !important;
  color: color-mix(in oklch, var(--ard-accent-secondary) 88%, black) !important;
  box-shadow: 0 0 0 1px color-mix(in oklch, var(--ard-accent-secondary) 28%, white);
}
[data-theme="light"] .ard-examples-select,
[data-theme="light"] .ard-board-select,
[data-theme="light"] .ard-speed-select {
  background: oklch(0.995 0.002 286.4);
  border-color: oklch(0.82 0.01 255);
  color: oklch(0.22 0.03 258);
}
[data-theme="light"] .ard-examples-select:hover,
[data-theme="light"] .ard-board-select:hover,
[data-theme="light"] .ard-speed-select:hover {
  background: oklch(0.965 0.008 260);
  border-color: oklch(0.74 0.018 252);
}
[data-theme="light"] .ard-examples-select:focus,
[data-theme="light"] .ard-board-select:focus,
[data-theme="light"] .ard-speed-select:focus {
  border-color: color-mix(in oklch, var(--ard-accent) 70%, black);
  box-shadow: 0 0 0 2px color-mix(in oklch, var(--ard-accent) 20%, transparent);
}

/* File Tabs (32px) */
.ard-file-tabs {
  display: flex;
  align-items: flex-end;
  height: 32px;
  background: var(--ard-tab-inactive);
  border-bottom: 1px solid var(--ard-border);
  flex-shrink: 0;
  overflow-x: auto;
}
.ard-file-tabs::-webkit-scrollbar { height: 0; }
.ard-file-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  height: 32px;
  background: var(--ard-tab-inactive);
  color: var(--ard-muted);
  font: 12px 'DM Sans', sans-serif;
  border-right: 1px solid var(--ard-border);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: background .1s;
}
.ard-file-tab:hover { background: rgba(255,255,255,.04); }
.ard-file-tab.active {
  background: var(--ard-tab-active);
  color: var(--ard-text);
  border-top: 2px solid var(--ard-accent);
}
.ard-file-tab-modified {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ard-warning);
}
.ard-file-tab-close {
  opacity: 0;
  font-size: 14px;
  color: var(--ard-muted);
  cursor: pointer;
  line-height: 1;
}
.ard-file-tab:hover .ard-file-tab-close,
.ard-file-tab.active .ard-file-tab-close { opacity: 1; }
.ard-file-tab-close:hover { color: var(--ard-error); }

/* Editor Container (Monaco fills this) */
.ard-editor-container {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background: var(--ard-editor-bg);
}

/* Output Panel (below editor, toggleable) */
.ard-output-panel {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--ard-panel-deep);
  border-top: 1px solid var(--ard-border);
}
.ard-output-resize {
  height: 5px;
  cursor: row-resize;
  background: var(--ard-border);
  transition: background .15s;
}
.ard-output-resize:hover { background: var(--ard-accent); }
.ard-output-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  height: 28px;
  font: 600 11px 'Sora', sans-serif;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--ard-muted);
  border-bottom: 1px solid var(--ard-border);
}
.ard-output-header button {
  margin-left: auto;
  border: none;
  background: transparent;
  color: var(--ard-muted);
  font: 11px 'DM Sans', sans-serif;
  cursor: pointer;
}
.ard-output-header button:hover { color: var(--ard-text); }
.ard-output-close { font-size: 16px; margin-left: 4px !important; }
.ard-output-close:hover { color: var(--ard-error) !important; }
.ard-output-content {
  flex: 1;
  overflow-y: auto;
  padding: 6px 10px;
  font: 12px/1.5 'Fira Code', monospace;
  color: var(--ard-muted);
  white-space: pre-wrap;
  word-break: break-all;
}
.ard-output-content .error { color: var(--ard-error); }
.ard-output-content .warning { color: var(--ard-warning); }
.ard-output-content .success { color: var(--ard-success); }

/* Error detail bar (below toolbar, when console is closed) */
.ard-error-bar {
  padding: 4px 10px;
  background: rgba(239,68,68,.08);
  border-bottom: 1px solid rgba(239,68,68,.2);
  font: 12px/1.4 'Fira Code', monospace;
  color: var(--ard-error);
  max-height: 60px;
  overflow-y: auto;
  flex-shrink: 0;
}

/* ── SPLITTER ── */
.ard-splitter {
  flex-shrink: 0;
  width: 5px;
  cursor: col-resize;
  background: var(--ard-border);
  transition: background .15s;
  position: relative;
  z-index: 10;
}
/* Wider invisible hit area so it's easy to grab */
.ard-splitter::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: -4px;
  right: -4px;
  cursor: col-resize;
}
.ard-splitter:hover,
.ard-splitter.dragging { background: var(--ard-accent); }

/* ── RIGHT: Simulator Side ── */
.ard-sim-side {
  flex: 1;
  min-width: 250px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Canvas Header (36px) */
.ard-canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  height: 36px;
  background: var(--ard-panel);
  border-bottom: 1px solid var(--ard-border);
  flex-shrink: 0;
}
.ard-canvas-header-left,
.ard-canvas-header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Status Dot */
.ard-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ard-muted);
  flex-shrink: 0;
}
.ard-status-dot.running {
  background: var(--ard-success);
  box-shadow: 0 0 6px var(--ard-success);
  animation: ard-pulse 2s infinite;
}
@keyframes ard-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}

/* Board Selector */
.ard-board-select {
  padding: 3px 8px;
  border: 1px solid var(--ard-border);
  border-radius: 4px;
  background: var(--ard-panel);
  color: var(--ard-text);
  font: 500 11px 'DM Sans', sans-serif;
  cursor: pointer;
  outline: none;
}
.ard-board-select:focus { border-color: var(--ard-accent); }

/* Speed Selector */
.ard-speed-select {
  padding: 3px 6px;
  border: 1px solid var(--ard-border);
  border-radius: 4px;
  background: var(--ard-panel);
  color: var(--ard-text);
  font: 500 11px 'Fira Code', monospace;
  cursor: pointer;
  outline: none;
}
.ard-speed-select:focus { border-color: var(--ard-accent); }

/* Canvas Area (pan/zoom container) */
.ard-canvas-area {
  flex: 1;
  overflow: hidden;
  background: var(--ard-panel-deep);
  position: relative;
  min-height: 0;
  cursor: grab;
  /* Dot grid pattern */
  background-image: radial-gradient(circle, var(--ard-border) 1px, transparent 1px);
  background-size: 20px 20px;
}
.ard-canvas-area:active { cursor: grabbing; }

/* World div — transformed by canvas.js */
.ard-canvas-world {
  position: absolute;
  top: 0; left: 0;
  width: 4000px; height: 3000px; /* fixed world size — matches Velxio */
  transform-origin: 0 0;
  /* Children are absolutely positioned */
}

.ard-board-wrap {
  position: absolute;
  left: 0; top: 0;
  cursor: grab;
}
.ard-board-wrap:active { cursor: grabbing; }
.ard-components-area {
  /* Components are absolutely positioned inside by canvas.js */
  position: absolute;
  top: 0; left: 0;
}
.ard-component-item {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: grab;
  transition: box-shadow .15s;
  padding: 6px;
  border-radius: 8px;
  overflow: visible; /* allow pin dots to extend outside */
  z-index: 5; /* above wire layer (z-index: 3) */
}
.ard-board-wrap { overflow: visible; z-index: 4; /* above wires, below components */ }
.ard-component-item:hover {
  box-shadow: 0 0 12px color-mix(in oklch, var(--ard-accent) 28%, transparent);
}
.ard-component-label {
  font: 10px 'Fira Code', monospace;
  color: var(--ard-muted);
  white-space: nowrap;
  pointer-events: none;
}

/* Selection highlight */
.ard-component-item.ard-selected,
.ard-board-wrap.ard-selected {
  outline: 2px dashed var(--ard-accent);
  outline-offset: 4px;
  border-radius: 4px;
}

/* Wire SVG layer */
.ard-wire-layer {
  position: absolute;
  top: 0; left: 0;
  width: 4000px; height: 3000px;
  pointer-events: none;
  overflow: visible;
  z-index: 3;
}
.ard-wire-layer path { pointer-events: stroke; cursor: pointer; }

/* Pin overlay (div-based, inside each component wrapper) */
.ard-pin-overlay-container { position: absolute; top: 0; left: 0; pointer-events: none; z-index: 30; }
.ard-pin-dot { pointer-events: all !important; }

/* Wire mode banner */
.ard-wire-banner {
  position: absolute;
  bottom: 12px; left: 50%;
  transform: translateX(-50%);
  background: color-mix(in oklch, var(--ard-accent) 88%, var(--foreground));
  color: var(--primary-foreground, #fff);
  padding: 6px 18px;
  border-radius: 20px;
  font: 600 12px 'DM Sans', sans-serif;
  z-index: 20;
  display: none;
  gap: 10px;
  align-items: center;
}
.ard-wire-banner.active { display: flex; }
.ard-wire-banner button {
  border: 1px solid rgba(255,255,255,.4);
  background: transparent;
  color: #fff;
  border-radius: 4px;
  padding: 2px 10px;
  font: 600 11px 'DM Sans', sans-serif;
  cursor: pointer;
}
.ard-wire-banner button:hover { background: rgba(255,255,255,.15); }

/* ── Serial Monitor (right bottom, toggleable) ── */
.ard-serial-panel {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--ard-serial-bg);
  border-top: 1px solid var(--ard-border);
}
.ard-serial-resize {
  height: 5px;
  cursor: row-resize;
  background: var(--ard-border);
  transition: background .15s;
}
.ard-serial-resize:hover { background: var(--ard-accent); }
.ard-serial-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  height: 28px;
  font: 600 11px 'Sora', sans-serif;
  color: var(--ard-muted);
  border-bottom: 1px solid var(--ard-border);
}
.ard-serial-title { text-transform: uppercase; letter-spacing: .04em; }
.ard-serial-baud {
  font: 11px 'Fira Code', monospace;
  margin-left: auto;
}
.ard-serial-header button {
  border: none;
  background: transparent;
  color: var(--ard-muted);
  font: 11px 'DM Sans', sans-serif;
  cursor: pointer;
  padding: 2px 6px;
}
.ard-serial-header button:hover { color: var(--ard-text); }
.ard-serial-output {
  flex: 1;
  overflow-y: auto;
  padding: 6px 10px;
  font: 12px/1.5 'Fira Code', monospace;
  color: var(--ard-serial-text);
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 0;
}
.ard-serial-input-row {
  display: flex;
  border-top: 1px solid var(--ard-border);
  flex-shrink: 0;
}
.ard-serial-input {
  flex: 1;
  padding: 6px 10px;
  border: none;
  background: transparent;
  color: var(--ard-text);
  font: 12px 'Fira Code', monospace;
  outline: none;
}
.ard-serial-input::placeholder { color: var(--ard-muted); }
.ard-serial-send {
  padding: 6px 14px;
  border: none;
  border-left: 1px solid var(--ard-border);
  background: transparent;
  color: var(--ard-accent);
  font: 600 11px 'DM Sans', sans-serif;
  cursor: pointer;
}
.ard-serial-send:hover { background: var(--ard-accent-soft); }

/* ── Ad Units ── */
.ad-ard-below {
  text-align: center;
  max-width: 970px;
  margin: 0 auto;
  min-height: 50px;
  flex-shrink: 0;
}
.ad-ard-sticky {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 6000;
  text-align: center;
  padding: 6px 0 8px;
  background: var(--ard-panel);
  border-top: 1px solid var(--ard-border);
  box-shadow: 0 -2px 12px rgba(0,0,0,.15);
  transform: translateY(100%);
  transition: transform .4s;
  display: none;
}

/* ── Scrollbar (thin, dark) ── */
.ard-serial-output::-webkit-scrollbar,
.ard-output-content::-webkit-scrollbar,
.ard-canvas-area::-webkit-scrollbar { width: 6px; }
.ard-serial-output::-webkit-scrollbar-thumb,
.ard-output-content::-webkit-scrollbar-thumb,
.ard-canvas-area::-webkit-scrollbar-thumb {
  background: var(--ard-border);
  border-radius: 3px;
}

/* ── Responsive ── */
@media (max-width: 991px) {
  .ard-editor-side { width: 35%; }
  .ard-tb-btn span { display: none; }
  /* Keep compile status visible on tablet — it shows boot progress */
  .ard-compile-status { font-size: 10px; max-width: 120px; overflow: hidden; text-overflow: ellipsis; }
}

@media (max-width: 767px) {
  .ard-app { padding-top: var(--header-height-mobile, 64px); }
  .ard-mobile-tabs { display: flex; }
  .ard-main { flex-direction: column; }
  .ard-splitter { display: none; }
  .ard-file-explorer, .ard-fe-resize { display: none; }
  .ard-editor-side, .ard-sim-side {
    display: none;
    width: 100% !important;
  }
  .ard-editor-side.active, .ard-sim-side.active {
    display: flex;
    flex: 1;
  }
  .ard-serial-panel.tab-active {
    flex: 1;
    height: auto !important;
  }

  /* Toolbar: compact layout */
  .ard-editor-toolbar { gap: 2px; padding: 0 4px; flex-wrap: nowrap; overflow-x: auto; }
  .ard-editor-toolbar .ard-tb-sep { display: none; }
  .ard-tb-btn { padding: 4px 6px; font-size: 11px; flex-shrink: 0; }
  .ard-tb-btn span { display: none; }
  /* Show Run/Stop labels — they're essential */
  .ard-tb-run span, .ard-tb-stop span { display: inline; font-size: 11px; }
  /* Compile status: visible but compact */
  .ard-compile-status { display: inline; font-size: 10px; max-width: 80px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  /* Examples dropdown: compact */
  .ard-examples-select { max-width: 100px; font-size: 11px; }

  /* Canvas header: compact */
  .ard-canvas-header { padding: 0 4px; gap: 2px; flex-wrap: nowrap; overflow-x: auto; }
  .ard-canvas-header .ard-tb-btn span { display: none; }
  .ard-board-select { max-width: 120px; font-size: 11px; }
  .ard-speed-select { max-width: 60px; font-size: 11px; }

  /* Component panel: full-width on mobile */
  .ard-comp-panel { width: 100% !important; }

  /* Serial panel: fill available space */
  .ard-serial-panel { border-radius: 0; }
  .ard-serial-output { font-size: 12px; }
  .ard-serial-input { font-size: 14px; } /* easier to type on mobile */

  /* Pi terminal: fill screen in serial tab */
  #piTerminalPanel.tab-active,
  #piTerminalPanel {
    border-radius: 0;
  }

  /* Hide diagram buttons on mobile (too small) */
  .ard-canvas-header-right .ard-tb-btn[title*="Diagram"] { display: none; }

  /* Ad hero: hide on mobile */
  .ad-ard-hero { display: none; }
  .ard-hero-bar { justify-content: center; padding: 4px 8px; }
  .ard-hero-h1 { font-size: 13px; }
}

/* ── User-select guard during drag ── */
.ard-dragging { user-select: none !important; cursor: col-resize !important; }
.ard-dragging-v { user-select: none !important; cursor: row-resize !important; }

/* ═══════════════════════════════════════════════════════════════
   AI ASSISTANT STYLES
   ═══════════════════════════════════════════════════════════════ */

/* AI toolbar buttons */
.ard-tb-ai {
  background: color-mix(in oklch, var(--ard-accent-secondary) 16%, transparent) !important;
  border-color: color-mix(in oklch, var(--ard-accent-secondary) 42%, transparent) !important;
  color: var(--ard-accent-secondary) !important;
  font-weight: 600;
  box-shadow: 0 0 0 1px color-mix(in oklch, var(--ard-ring) 22%, transparent);
}
.ard-tb-ai:hover {
  background: color-mix(in oklch, var(--ard-accent-secondary) 26%, transparent) !important;
}

.ard-tb-aifix {
  background: color-mix(in oklch, var(--ard-error) 12%, transparent) !important;
  color: var(--ard-error) !important;
}
.ard-tb-aifix:hover {
  background: color-mix(in oklch, var(--ard-error) 20%, transparent) !important;
}

/* AI status indicator (beside compile status) */
.ard-ai-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: 11px 'Fira Code', monospace;
  color: var(--ard-accent-secondary);
  margin-right: 8px;
  animation: ardAiPulse 1.5s ease-in-out infinite;
}
.ard-ai-spinner { width: 14px; height: 14px; display: inline-block; }

@keyframes ardAiPulse {
  0%, 100% { opacity: .6; }
  50% { opacity: 1; }
}

/* AI Prompt Modal */
.ard-ai-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(3px);
}

.ard-ai-modal {
  width: 520px;
  max-width: 92vw;
  background: var(--ard-panel);
  border: 1px solid var(--ard-border);
  border-radius: 12px;
  box-shadow: 0 24px 64px rgba(0,0,0,.5);
  overflow: hidden;
}

.ard-ai-modal-header {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--ard-border);
  font: 600 14px/1.3 'Sora', sans-serif;
  color: var(--ard-text);
}

.ard-ai-modal-close {
  background: none;
  border: none;
  color: var(--ard-muted);
  font-size: 22px;
  cursor: pointer;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  transition: all .15s;
}
.ard-ai-modal-close:hover { background: rgba(255,255,255,.06); color: var(--ard-text); }

.ard-ai-modal-body { padding: 16px 18px; }

.ard-ai-input {
  width: 100%;
  background: var(--ard-bg);
  border: 1px solid var(--ard-border);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--ard-text);
  font: 13px/1.5 'DM Sans', sans-serif;
  resize: none;
  outline: none;
  transition: border-color .15s;
}
.ard-ai-input:focus { border-color: var(--ard-accent-secondary); box-shadow: 0 0 0 2px color-mix(in oklch, var(--ard-ring) 35%, transparent); }
.ard-ai-input::placeholder { color: var(--ard-muted); }

.ard-ai-modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
}

.ard-ai-hint {
  font-size: 11px;
  color: var(--ard-muted);
}

.ard-ai-submit {
  padding: 8px 20px;
  border-radius: var(--radius, 0.5rem);
  border: none;
  background: var(--ard-accent-secondary);
  color: var(--accent-foreground, #fff);
  font: 600 13px 'DM Sans', sans-serif;
  cursor: pointer;
  transition: background .15s, filter .15s;
}
.ard-ai-submit:hover { filter: brightness(1.08); }

[data-theme="light"] .ard-ai-input { background: var(--secondary); }