@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Inter:wght@400;500;600&display=swap');

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

:root {
  /* ── Spacing & Radius ── */
  --radius-sm:   4px;
  --radius-md:   7px;
  --radius-lg:   10px;
  --sidebar-w:   230px;
  --panel-w:     320px;
  --topbar-h:    48px;

  /* ── Typography ── */
  --font-ui:     'Inter', system-ui, sans-serif;
  --font-mono:   'IBM Plex Mono', 'Courier New', monospace;
  --font-size-xs: 10px;
  --font-size-sm: 11px;
  --font-size-md: 13px;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-canvas);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  user-select: none;
  transition: background 0.2s, color 0.2s;
}

/* ════════════════════════════════
   Layout Grid
   ════════════════════════════════ */
#app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--panel-w);
  grid-template-rows: var(--topbar-h) 1fr;
  height: 100vh;
}

/* ════════════════════════════════
   Topbar
   ════════════════════════════════ */
#topbar {
  grid-column: 1 / -1;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
}

#topbar h1 {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
  white-space: nowrap;
  font-family: var(--font-mono);
}

.sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

.spacer { flex: 1; }

.hint {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ════════════════════════════════
   Topbar Buttons
   ════════════════════════════════ */
.tb-btn {
  background: var(--btn-bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  cursor: pointer;
  font-family: var(--font-ui);
  font-weight: 500;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  white-space: nowrap;
}

.tb-btn:hover {
  background: var(--btn-bg-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

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

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

.tb-btn.success {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-fg);
}

.tb-btn.success:hover {
  background: var(--success-hover);
}

/* ════════════════════════════════
   Sidebar
   ════════════════════════════════ */
#sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 6px 6px 20px;
}

#sidebar h2 {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 10px 8px 4px;
  font-weight: 600;
}

.node-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  transition: background 0.1s, color 0.1s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-ui);
  line-height: 1.4;
}

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

.node-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ════════════════════════════════
   Canvas
   ════════════════════════════════ */
#canvas-wrap {
  position: relative;
  overflow: hidden;
  background: var(--bg-canvas);
  background-image: var(--canvas-grid);
  background-size: 28px 28px;
}

#canvas {
  position: absolute;
  inset: 0;
  cursor: grab;
}

#canvas.grabbing { cursor: grabbing; }

#canvas svg {
  position: absolute;
  inset: 0;
  overflow: visible;
}

#nodes-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.zoom-info {
  position: absolute;
  bottom: 10px;
  right: 10px;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  pointer-events: none;
  font-family: var(--font-mono);
}

.canvas-hint {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: var(--font-size-xs);
  color: var(--text-faint);
  pointer-events: none;
  text-align: center;
  font-family: var(--font-mono);
}

/* ════════════════════════════════
   Output Panel
   ════════════════════════════════ */
#output-panel {
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.panel-header {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 12px 14px 8px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#code-out {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: 1.75;
  color: var(--code-color);
  white-space: pre;
  tab-size: 2;
  transition: color 0.2s;
}

#code-out.placeholder {
  color: var(--text-faint);
  font-style: italic;
}

.copy-row {
  padding: 8px 10px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 6px;
}

/* ════════════════════════════════
   Blueprint Nodes
   ════════════════════════════════ */
.bp-node {
  position: absolute;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--node-border);
  background: var(--node-bg);
  min-width: 190px;
  cursor: move;
  box-shadow: var(--node-shadow);
  transition: border-color 0.12s, box-shadow 0.12s;
}

.bp-node.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 20%, transparent), var(--node-shadow);
}

.bp-node:hover {
  border-color: var(--node-border-hover);
}

.node-header {
  padding: 8px 10px;
  border-radius: calc(var(--radius-md) - 2px) calc(var(--radius-md) - 2px) 0 0;
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.node-body { padding: 6px 0 8px; }

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 0;
  min-height: 26px;
  position: relative;
}

/* ── Pins ── */
.pin {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid;
  cursor: crosshair;
  position: absolute;
  transition: transform 0.1s, background 0.1s;
  flex-shrink: 0;
  background: var(--node-bg);
}

.pin:hover {
  transform: scale(1.5);
  z-index: 10;
}

.pin.left  { left: -6px; }
.pin.right { right: -6px; }

.node-row .lbl {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  padding: 0 20px;
  white-space: nowrap;
  font-family: var(--font-mono);
}

.node-row .lbl.right {
  text-align: right;
  margin-left: auto;
}

.node-row input[type="text"],
.node-row input[type="number"],
.node-row select {
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: var(--font-size-xs);
  padding: 3px 7px;
  border-radius: var(--radius-sm);
  width: calc(100% - 28px);
  margin: 0 14px;
  font-family: var(--font-mono);
  outline: none;
  min-width: 0;
  transition: border-color 0.12s;
}

.node-row input:focus,
.node-row select:focus {
  border-color: var(--border-focus);
}

/* ════════════════════════════════
   Wires
   ════════════════════════════════ */
.wire {
  fill: none;
  cursor: pointer;
}
.wire-hitarea {
  fill: none;
  cursor: pointer;
}
.wire.hovered {
  filter: brightness(2) drop-shadow(0 0 6px white);
  stroke-width: 5 !important;
}

.wire-preview {
  fill: none;
  stroke-width: 2;
  stroke-dasharray: 7 4;
  stroke: var(--accent);
  opacity: 0.8;
}

/* ════════════════════════════════
   Context Menu
   ════════════════════════════════ */
.ctx-menu {
  position: fixed;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 4px;
  min-width: 200px;
  z-index: 9999;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.ctx-item {
  padding: 7px 12px;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  white-space: nowrap;
  transition: background 0.1s, color 0.1s;
}

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

.ctx-sep {
  height: 1px;
  background: var(--border);
  margin: 3px 0;
}

.ctx-cat {
  padding: 4px 12px 2px;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

/* ════════════════════════════════
   Scrollbar
   ════════════════════════════════ */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-focus); }

/* ════════════════════════════════
   Theme Picker Modal
   ════════════════════════════════ */
#theme-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

#theme-modal.open {
  display: flex;
}

.theme-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 680px;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 64px rgba(0,0,0,0.4);
}

.theme-panel-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theme-panel-header h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.theme-panel-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  overflow: hidden;
  flex: 1;
}

.theme-list {
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 8px;
}

.theme-item {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.1s, color 0.1s;
  font-family: var(--font-ui);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

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

.theme-item.active {
  background: var(--surface-hover);
  color: var(--text-primary);
  font-weight: 600;
}

.theme-swatch {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
}

.theme-editor {
  padding: 16px;
  overflow-y: auto;
}

.theme-editor h3 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.token-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.token-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.token-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.token-row input[type="color"] {
  width: 100%;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  cursor: pointer;
  padding: 2px;
}

.theme-editor-actions {
  margin-top: 14px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.theme-name-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}

.theme-name-row input[type="text"] {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  outline: none;
}

.theme-name-row input:focus {
  border-color: var(--border-focus);
}

.theme-preview-strip {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  height: 36px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.preview-swatch {
  flex: 1;
  transition: flex 0.15s;
}

.preview-swatch:hover { flex: 2; }